:root {
  --ink: #20302b;
  --muted: #75817d;
  --paper: #fbfaf6;
  --panel: #f2f0e8;
  --line: #deddd5;
  --green: #245b4a;
  --green-2: #3c7964;
  --mint: #dfece5;
  --gold: #c99c48;
  --white: #fff;
  --danger: #a4483f;
  --shadow: 0 24px 70px rgba(26, 48, 40, 0.14);
}
:root[data-theme="ocean"] {
  --green: #315f82; --green-2: #477b9d; --mint: #e0ebf2;
}
:root[data-theme="violet"] {
  --green: #66558d; --green-2: #806ca6; --mint: #eae5f2;
}
:root[data-theme="sunset"] {
  --green: #a85845; --green-2: #bd705d; --mint: #f3e5e0;
}

* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; }
body {
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
button, input, textarea { font: inherit; }
button { color: inherit; }
button, .file-label { -webkit-tap-highlight-color: transparent; }
.hidden { display: none !important; }

.app-shell { height: 100dvh; min-height: 0; display: grid; grid-template-columns: 304px minmax(0, 1fr); overflow: hidden; }
.sidebar {
  height: 100dvh;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 28px 20px 20px;
  background: var(--panel);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}
.sidebar-scrim { display: none; }
.brand { display: flex; align-items: center; gap: 12px; padding: 0 10px 28px; }
.brand-mark {
  width: 44px; height: 44px; display: grid; place-items: center;
  color: #fff; border-radius: 13px 13px 13px 4px;
  background: var(--green);
  font: 700 21px/1 "Songti SC", serif;
}
.brand-mark { object-fit: cover; }
.brand strong { display: block; font-family: Georgia, "Songti SC", serif; font-size: 16px; letter-spacing: .04em; }
.brand span { color: var(--muted); font-size: 12px; letter-spacing: .1em; }
.icon-button, .text-button, .mini-button, .modal-close {
  border: 0; background: transparent; cursor: pointer;
}
.sidebar-close { display: none; margin-left: auto; font-size: 24px; }
.send-button:hover, .primary-button:hover { background: color-mix(in srgb, var(--green) 82%, #000); }
.subject-nav { flex: 1; padding-top: 4px; }
.eyebrow { margin: 0 0 11px; color: #747f7a; font-size: 12px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
.subject-nav-heading { display: flex; align-items: center; justify-content: space-between; padding: 0 8px 8px 10px; }
.subject-nav-heading .eyebrow { margin: 0; }
.subject-group { margin: 2px 0 7px; }
.subject-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 32px;
  gap: 5px;
  align-items: center;
}
.subject-button {
  min-width: 0; width: 100%; padding: 9px 7px;
  display: flex; align-items: center; gap: 9px;
  border: 0; border-radius: 10px; background: transparent; cursor: pointer;
  text-align: left; color: #53615b; font-size: 14px;
}
.subject-caret {
  width: 13px; flex: 0 0 13px; color: #85908b; font-size: 11px;
  transform: rotate(-90deg); transition: transform .16s ease;
}
.subject-button[aria-expanded="true"] .subject-caret { transform: rotate(0); }
.subject-emoji {
  width: 29px; height: 29px; display: grid; place-items: center;
  border-radius: 8px; background: #e4e4dd; font-size: 16px; line-height: 1;
}
.subject-name { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.subject-button:hover { background: rgba(255,255,255,.6); }
.subject-button.active { color: var(--green); background: #fff; box-shadow: 0 5px 16px rgba(44,61,54,.07); font-weight: 650; }
.subject-button.active .subject-emoji { background: var(--mint); }
.subject-new-chat {
  width: 32px; height: 32px; padding: 0; display: grid; place-items: center;
  border: 0; border-radius: 8px; color: var(--green); background: transparent;
  cursor: pointer; font-size: 21px; font-weight: 350; line-height: 1;
}
.subject-new-chat:hover, .subject-new-chat:focus-visible { color: #fff; background: var(--green); outline: 0; }
.subject-conversations {
  margin: 3px 4px 7px 19px;
  padding: 2px 0 2px 11px;
  border-left: 1px solid #d5dbd7;
}
.subject-conversations[hidden] { display: none; }
.text-button {
  padding: 3px 1px; color: var(--green); font-size: 13px; font-weight: 650;
  text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 4px;
}
.text-button:hover, .text-button.active { color: var(--green-2); text-decoration-thickness: 2px; }
.conversation-item {
  position: relative; width: 100%; border: 0; background: transparent;
  padding: 9px 58px 9px 10px; border-radius: 9px; cursor: pointer; text-align: left;
}
.conversation-item:focus-visible { outline: 2px solid color-mix(in srgb, var(--green) 35%, transparent); outline-offset: -2px; }
.conversation-item:hover, .conversation-item.active { background: rgba(255,255,255,.72); }
.conversation-item strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; font-weight: 650; }
.conversation-item small { color: #7f8985; font-size: 11px; }
.archive-chat, .delete-chat {
  position: absolute; top: 50%; width: 28px; height: 28px; padding: 0; opacity: 0;
  transform: translateY(-50%); display: grid; place-items: center;
  border: 0; border-radius: 6px; background: transparent; cursor: pointer; color: #74817b;
}
.archive-chat { right: 33px; opacity: .68; }
.conversation-item:not(.archived) .archive-chat { right: 8px; }
.delete-chat { right: 7px; color: var(--danger); opacity: .68; }
.archive-chat svg, .delete-chat svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.archive-chat:hover { background: #e7ece8; }
.delete-chat:hover { background: #f7e5e3; }
.conversation-item:hover .archive-chat, .conversation-item:hover .delete-chat,
.conversation-item:focus-within .archive-chat, .conversation-item:focus-within .delete-chat { opacity: 1; }
.empty-history { margin: 0; padding: 9px 10px; color: #828d88; font-size: 12px; line-height: 1.55; }
.sidebar-footer { padding-top: 14px; border-top: 1px solid var(--line); }
.profile-button { width: 100%; padding: 8px; display: flex; align-items: center; gap: 10px; border: 0; background: transparent; cursor: pointer; text-align: left; }
.profile-button > span:nth-child(2) { flex: 1; }
.profile-button strong { display: block; font-size: 13px; }
.profile-button small { display: block; font-size: 11px; }
.profile-button small { color: var(--muted); margin-top: 3px; }
.avatar { width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid #cad2ce; border-radius: 50%; object-fit: cover; font: 700 12px/1 serif; }
.status-dot { display: inline-block; width: 6px; height: 6px; background: #5ba47d; border-radius: 50%; }

.main { min-width: 0; height: 100dvh; min-height: 0; display: grid; grid-template-rows: 78px minmax(0,1fr) auto; overflow: hidden; }
.topbar { padding: 0 32px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid #e9e7e0; }
.course-title { display: flex; align-items: center; gap: 11px; }
.subject-icon { width: 35px; height: 35px; display: grid; place-items: center; color: var(--green); background: var(--mint); border-radius: 9px; font-size: 17px; line-height: 1; }
.course-title strong { display: block; }
.course-title strong { font-size: 15px; }
.top-actions { display: flex; gap: 13px; align-items: center; }
.mode-switcher {
  display: flex; gap: 3px; padding: 4px;
  border: 1px solid var(--line); border-radius: 10px;
  background: #f7f6f2;
}
.mode-btn {
  width: 34px; height: 30px; padding: 0; border: 0; border-radius: 7px;
  background: transparent; cursor: pointer; font-size: 16px;
  display: grid; place-items: center; transition: background .15s;
}
.mode-btn:hover { background: color-mix(in srgb, var(--green) 8%, transparent); }
.mode-btn.active { background: var(--mint); box-shadow: 0 1px 3px rgba(0,0,0,.06); }
.top-actions .icon-button { width: 34px; height: 34px; border: 1px solid var(--line); border-radius: 9px; }
.export-chat-button {
  min-height: 36px; padding: 7px 11px; display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid #ccd8d2; border-radius: 9px; color: var(--green);
  background: #fff; cursor: pointer; font-size: 12px; font-weight: 650;
}
.export-chat-button:hover { border-color: #8fad9f; background: #f1f6f3; }
.export-chat-button span:first-child { font-size: 16px; line-height: 1; }
.privacy-pill { padding: 8px 12px; color: #58766a; background: #edf3ef; border-radius: 999px; font-size: 12px; }
.privacy-pill i { display: inline-block; width: 6px; height: 6px; margin-right: 4px; background: #5aa17c; border-radius: 50%; }
.menu-button { display: none; }

.chat-view { min-height: 0; overflow-y: auto; overscroll-behavior: contain; scrollbar-gutter: stable; }
.welcome { width: min(760px, 88%); margin: auto; padding: 8vh 0 35px; text-align: center; }
.welcome h1 { margin: 13px 0; font: 700 clamp(26px,3vw,40px)/1.25 "Songti SC", "SimSun", serif; letter-spacing: .02em; }
.welcome-copy { max-width: 600px; margin: 0 auto; color: #65726d; font-size: 15px; line-height: 1.8; }
.suggestions { margin-top: 36px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.suggestion {
  min-height: 95px; padding: 18px; border: 1px solid #e1e2dc; border-radius: 12px;
  background: rgba(255,255,255,.65); cursor: pointer; text-align: left;
  transition: transform .18s, border-color .18s, box-shadow .18s;
}
.suggestion:hover { transform: translateY(-2px); border-color: #b7cfc4; box-shadow: 0 10px 28px rgba(43, 70, 59, .08); }
.suggestion span { display: block; margin-bottom: 8px; color: var(--green-2); font-size: 12px; }
.suggestion strong { font-size: 14px; line-height: 1.55; }
.messages { width: min(820px, 90%); margin: 0 auto; padding: 38px 0 90px; }
.message { min-width: 0; max-width: 100%; margin: 0 0 28px; display: flex; gap: 13px; align-items: flex-start; }
.message.assistant { width: 100%; }
.message.user { justify-content: flex-end; }
.message-avatar { flex: 0 0 auto; width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; object-fit: cover; background: var(--green); color: #fff; font: 700 12px/1 serif; }
.message.user .message-avatar { order: 2; background: #e4e4dd; color: #55635d; }
.message-body { min-width: 0; max-width: min(650px, 78%); }
.message.assistant .message-body {
  flex: 0 1 auto;
  width: fit-content;
  max-width: min(650px, calc(100% - 49px));
  padding: 11px 15px;
  border: 1px solid #e1e5e2;
  border-radius: 4px 14px 14px 14px;
  background: #eeeee8;
}
.message.user .message-body { flex: 0 1 auto; width: fit-content; }
.message.user .message-body { padding: 11px 15px; background: #eeeee8; border-radius: 14px 4px 14px 14px; }
.message-text {
  min-width: 0;
  font-size: 15px;
  line-height: 1.85;
  word-break: normal;
  overflow-wrap: break-word;
  hyphens: none;
}
.message-text .short-line {
  display: block;
  min-width: 0;
  min-height: 1.8em;
  word-break: normal;
  overflow-wrap: break-word;
  hyphens: none;
  animation: lineIn .3s ease both;
}
.message-text strong { color: color-mix(in srgb, var(--green) 62%, var(--ink)); font-weight: 750; }
.message-text em { color: color-mix(in srgb, var(--green) 28%, var(--ink)); font-style: italic; }
.message-text del { color: #7d8883; text-decoration-thickness: 1.5px; }
.message-text > :first-child { margin-top: 0; }
.message-text > :last-child { margin-bottom: 0; }
.message-text p { margin: 0 0 .72em; line-height: 1.78; }
.message-text h1, .message-text h2, .message-text h3,
.message-text h4, .message-text h5, .message-text h6 {
  margin: 1.05em 0 .45em; color: var(--ink); font-family: inherit; font-weight: 760; line-height: 1.4;
}
.message-text h1 { font-size: 1.42em; }
.message-text h2 { font-size: 1.28em; }
.message-text h3 { font-size: 1.16em; }
.message-text h4, .message-text h5, .message-text h6 { font-size: 1.05em; }
.message-text ul, .message-text ol {
  max-width: 100%; margin: .35em 0 .85em; padding-left: 1.65em;
}
.message-text li {
  min-width: 0; width: auto; margin: .24em 0; padding-left: .16em;
  line-height: 1.72; white-space: normal; word-break: normal; overflow-wrap: break-word;
}
.message-text li > p { display: block; margin: 0; }
.message-text li::marker { color: var(--green-2); font-weight: 700; }
.message-text li > ul, .message-text li > ol { margin: .18em 0; }
.message-text blockquote {
  margin: .65em 0; padding: .62em .9em;
  border-left: 3px solid var(--green-2); border-radius: 0 9px 9px 0;
  color: #53675e; background: rgba(223,236,229,.48);
}
.message-text blockquote > :last-child { margin-bottom: 0; }
.message-text :not(pre) > code {
  padding: .13em .36em; border: 1px solid #dce2de; border-radius: 5px;
  color: #31594a; background: #f2f5f3; font: .9em/1.45 Consolas, "SFMono-Regular", monospace;
}
.message-text hr { margin: .85em 0; border: 0; border-top: 1px solid #d8dedb; }
.rich-code-block {
  position: relative; max-width: 100%; margin: .75em 0; padding: 38px 15px 14px;
  overflow: auto; border: 1px solid #263c33; border-radius: 11px;
  color: #e7ebef; background: #20252b; font: 12.5px/1.68 Consolas, "SFMono-Regular", monospace;
  tab-size: 2;
}
.rich-code-block code { display: block; min-width: max-content; color: inherit; white-space: pre; }
.copy-code-button {
  position: absolute; right: 8px; top: 7px; padding: 4px 8px;
  border: 1px solid rgba(255,255,255,.16); border-radius: 6px;
  color: #c9d8d1; background: rgba(255,255,255,.06); cursor: pointer; font: 11px/1.4 inherit;
}
.copy-code-button:hover { color: #fff; background: rgba(255,255,255,.12); }
.rich-table-wrap {
  width: 100%; margin: .75em 0; overflow-x: auto;
  border: 1px solid #dce2de; border-radius: 10px; background: #fff;
}
.rich-table-wrap table { width: 100%; min-width: 420px; border-collapse: collapse; font-size: .93em; line-height: 1.55; }
.rich-table-wrap th, .rich-table-wrap td { padding: 9px 11px; border-right: 1px solid #e4e8e5; border-bottom: 1px solid #e4e8e5; text-align: left; vertical-align: top; }
.rich-table-wrap th { color: #294b3e; background: #edf4f0; font-weight: 750; }
.rich-table-wrap tr:last-child td { border-bottom: 0; }
.rich-table-wrap th:last-child, .rich-table-wrap td:last-child { border-right: 0; }
.rich-math { color: color-mix(in srgb, var(--green) 58%, var(--ink)); font-size: 1em; }
.rich-math-inline {
  display: inline-block; max-width: 100%; margin: 0 .09em; padding: .08em 0;
  overflow-x: auto; overflow-y: hidden;
  vertical-align: -.12em; white-space: nowrap;
  scrollbar-width: thin;
}
.rich-math-inline .katex { display: inline-block; line-height: 1.15; white-space: nowrap; }
.rich-math-block {
  width: auto; max-width: 100%; margin: .72em 0; padding: .48em .6em;
  overflow-x: auto; overflow-y: hidden; border-radius: 9px;
  background: rgba(223,236,229,.42); text-align: center;
}
.rich-math-block .katex-display { display: inline-block; min-width: 100%; margin: 0; text-align: center; }
.rich-math-block .katex-display > .katex { min-width: max-content; }
.rich-math-error { padding: .18em .35em; color: #914c43; background: #fff1ef; border-radius: 5px; font-family: monospace; }
.rich-block-in { animation: lineIn .28s ease both; }
.markdown-heading { margin: 9px 0 4px; color: var(--ink); font-weight: 750; line-height: 1.45 !important; }
.markdown-heading.level-1 { font-size: 1.35em; }
.markdown-heading.level-2 { font-size: 1.22em; }
.markdown-heading.level-3 { font-size: 1.12em; }
.markdown-heading.level-4, .markdown-heading.level-5, .markdown-heading.level-6 { font-size: 1.04em; }
.markdown-list-item { min-height: 1.8em; display: grid !important; grid-template-columns: 22px minmax(0,1fr); align-items: start; }
.markdown-list-marker { color: var(--green-2); font-weight: 750; text-align: center; }
.markdown-list-marker.ordered { font-size: .88em; }
.markdown-list-content { min-width: 0; display: inline; line-height: 1.8; }
.markdown-quote {
  min-height: auto !important; margin: 6px 0; padding: 8px 12px;
  border-left: 3px solid var(--green-2); border-radius: 0 8px 8px 0;
  color: #53675e; background: rgba(223,236,229,.46);
}
.markdown-code {
  padding: .14em .38em; border: 1px solid #dce2de; border-radius: 5px;
  color: #31594a; background: #f2f5f3; font: .9em/1.4 Consolas, "SFMono-Regular", monospace;
}
.markdown-code-block {
  position: relative; max-width: 100%; margin: 8px 0; padding: 12px 14px;
  overflow: auto; border-radius: 10px; color: #e7efeb; background: #21332c;
  font: 12px/1.65 Consolas, "SFMono-Regular", monospace; tab-size: 2;
}
.markdown-code-block code { white-space: pre; }
.markdown-code-block code[data-language]::before {
  content: attr(data-language); display: block; margin-bottom: 7px;
  color: #93aa9f; font: 700 10px/1.2 Inter, sans-serif; text-transform: uppercase;
}
.markdown-link { color: var(--green); font-weight: 650; text-decoration: underline; text-underline-offset: 3px; }
.markdown-link:hover { color: var(--green-2); }
.markdown-rule { min-height: auto !important; padding: 7px 0; }
.markdown-rule hr { margin: 0; border: 0; border-top: 1px solid #d8dedb; }
.markdown-gap { height: .55em; }
.markdown-table {
  width: 100%; margin: 9px 0 12px; overflow-x: auto;
  border: 1px solid #dce2de; border-radius: 9px; background: #fff;
}
.markdown-table-row {
  min-width: 100%; width: max-content; display: grid;
  grid-template-columns: repeat(var(--table-columns), minmax(112px, 1fr));
  border-bottom: 1px solid #e2e7e4;
}
.markdown-table-row:last-child { border-bottom: 0; }
.markdown-table-row.header { color: #294b3e; background: #edf4f0; font-weight: 750; }
.markdown-table-cell { min-width: 0; padding: 8px 10px; border-right: 1px solid #e4e8e5; }
.markdown-table-cell:last-child { border-right: 0; }
.markdown-math-block {
  max-width: 100%; margin: 7px 0; padding: 3px 0 5px;
  overflow-x: auto; overflow-y: hidden;
}
.rendered-math {
  margin: 0 .09em; padding: .08em 0;
  display: inline-flex; align-items: center; gap: .08em;
  color: color-mix(in srgb, var(--green) 56%, var(--ink)); border-radius: 0; background: transparent;
  font-family: "Cambria Math", "STIX Two Math", "Times New Roman", serif;
  font-size: 1.04em; line-height: 1.2; vertical-align: -.1em; white-space: nowrap;
}
.display-math { margin-left: 0; padding: .18em .42em; font-size: 1.12em; }
.math-fraction {
  display: inline-grid; grid-template-rows: auto auto;
  align-items: center; justify-items: stretch; vertical-align: middle;
  line-height: 1.05; text-align: center;
}
.math-numerator { padding: 0 .2em .08em; border-bottom: 1.4px solid currentColor; }
.math-denominator { padding: .08em .2em 0; }
.math-root { display: inline-flex; align-items: stretch; }
.math-root-index { align-self: flex-start; margin-right: -.08em; font-size: .58em !important; }
.root-symbol { font-size: 1.35em; line-height: 1; }
.root-content { padding: 0 .18em; border-top: 1.3px solid currentColor; }
.rendered-math sup, .rendered-math sub {
  position: relative; font-size: .72em; line-height: 1;
}
.rendered-math sup { top: -.42em; }
.rendered-math sub { bottom: -.32em; }
.math-vector { position: relative; padding-top: .1em; }
.math-vector::before {
  content: "→"; position: absolute; left: 50%; top: -.72em;
  transform: translateX(-50%) scaleX(.82); font-size: .8em;
}
.math-overline { border-top: 1.2px solid currentColor; line-height: 1; }
.math-hat { position: relative; padding-top: .08em; }
.math-hat::before {
  content: "ˆ"; position: absolute; left: 50%; top: -.72em;
  transform: translateX(-50%); font-size: .8em;
}
.math-dot, .math-ddot { position: relative; padding-top: .08em; }
.math-dot::before, .math-ddot::before {
  position: absolute; left: 50%; top: -.72em; transform: translateX(-50%);
  font-size: .9em; line-height: 1;
}
.math-dot::before { content: "˙"; }
.math-ddot::before { content: "¨"; }
.math-boxed { margin: 0 .12em; padding: .04em .3em; border: 1.4px solid currentColor; border-radius: 2px; }
.math-bold { font-weight: 700; }
.math-roman { font-style: normal; }
.short-line.visual-line { margin: 12px 0 16px; }
.teaching-visual {
  width: min(100%, 660px); margin: 0; padding: 14px 16px 12px;
  border: 1px solid #d8e2dc; border-radius: 14px;
  background: linear-gradient(145deg, #fff, rgba(223,236,229,.38));
  box-shadow: 0 10px 28px rgba(34, 63, 51, .07);
  overflow: hidden;
}
.teaching-visual figcaption { margin-bottom: 7px; display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 5px 12px; }
.teaching-visual figcaption span { color: var(--green-2); font-size: 10px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.teaching-visual figcaption strong { min-width: 0; max-width: 68%; color: var(--ink); font-size: 13px; text-align: right; overflow-wrap: break-word; }
.teaching-visual svg { width: 100%; height: auto; display: block; font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif; }
.teaching-board {
  width: 100%; height: auto; min-height: 220px; max-height: 390px;
  aspect-ratio: 16 / 9;
  border: 1px solid #dde5e0; border-radius: 10px;
  background: rgba(255,255,255,.88); touch-action: none;
}
.teaching-board .JXGtext {
  color: #42564d !important;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif !important;
}
.teaching-board .JXG_navigation { opacity: .62; transition: opacity .18s; }
.teaching-board:hover .JXG_navigation, .teaching-board:focus-within .JXG_navigation { opacity: 1; }
.visual-legend {
  margin-top: 9px; display: flex; flex-wrap: wrap; gap: 7px 14px;
  color: #52645c; font-size: 12px; line-height: 1.45;
}
.visual-legend-item { min-width: 0; max-width: 100%; display: inline-flex; align-items: center; gap: 6px; }
.visual-legend-item i { width: 18px; height: 3px; flex: 0 0 18px; border-radius: 999px; }
.visual-legend-item span { min-width: 0; white-space: normal; overflow-wrap: break-word; }
.visual-grid { stroke: #dfe5e1; stroke-width: 1; }
.visual-grid.axis { stroke: #c4d0ca; }
.visual-axis { stroke: #84968e; stroke-width: 1.4; }
.visual-axis-label { fill: #78857f; font-size: 10px; text-anchor: middle; }
.visual-axis-label.y { text-anchor: end; }
.visual-formula-label { fill: var(--green); font: 600 12px "Cambria Math", serif; text-anchor: end; }
.visual-curve { fill: none; stroke: var(--green); stroke-width: 2.7; stroke-linecap: round; stroke-linejoin: round; }
.visual-origin { fill: var(--ink); }
.visual-vector { stroke: var(--green); stroke-width: 3; }
.visual-vector.v1 { stroke: #c58e36; }
.visual-vector.v2 { stroke: #66558d; }
.visual-vector.v3 { stroke: #a85845; }
.visual-arrow-head { fill: var(--green); stroke: none; }
.visual-vector-label { fill: var(--green); font-size: 12px; font-weight: 700; }
.visual-vector-label.v1 { fill: #a87526; }
.visual-vector-label.v2 { fill: #66558d; }
.visual-vector-label.v3 { fill: #a85845; }
.visual-triangle { fill: color-mix(in srgb, var(--green) 12%, transparent); stroke: var(--green); stroke-width: 2.5; stroke-linejoin: round; }
.visual-point { fill: var(--green); }
.visual-point-label, .visual-side-label { fill: var(--ink); font-size: 13px; font-weight: 700; }
.visual-side-label { fill: var(--green-2); }
.visual-error { display: block; padding: 10px 12px; color: #886849; background: #f7efe2; border-radius: 8px; font-size: 12px; }
.message-attachments { margin-top: 9px; display: flex; flex-wrap: wrap; gap: 8px; }
.message-attachment {
  max-width: 230px; padding: 7px 9px; display: flex; align-items: center; gap: 8px;
  border: 1px solid #dde2de; border-radius: 9px; background: rgba(255,255,255,.7);
  color: #596760; font-size: 12px;
}
.message-attachment img { width: 72px; height: 58px; border-radius: 6px; object-fit: cover; cursor: zoom-in; }
.message-attachment span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.message-ocr-status { color: var(--green-2); font-size: 10px; white-space: nowrap; }
.message-meta { margin-top: 7px; color: #858f8a; font-size: 11px; }
.thinking { display: flex; gap: 5px; padding-top: 8px; }
.thinking i { width: 6px; height: 6px; background: #7ea18f; border-radius: 50%; animation: blink 1.1s infinite; }
.thinking i:nth-child(2) { animation-delay: .15s; }
.thinking i:nth-child(3) { animation-delay: .3s; }
@keyframes blink { 0%,80%,100%{opacity:.25; transform:translateY(0)} 40%{opacity:1; transform:translateY(-3px)} }
@keyframes lineIn { from{opacity:0;transform:translateY(4px)} to{opacity:1;transform:none} }

.composer-wrap { position: relative; z-index: 2; width: min(820px, 90%); margin: 0 auto; padding-bottom: 15px; background: var(--paper); }
.composer { padding: 13px 13px 10px 17px; border: 1px solid #d4d8d3; border-radius: 15px; background: #fff; box-shadow: 0 13px 38px rgba(39,59,51,.09); }
.composer:focus-within { border-color: #82a595; box-shadow: 0 13px 38px rgba(39,59,51,.12), 0 0 0 3px rgba(82,143,115,.08); }
.composer textarea { display: block; width: 100%; max-height: 150px; field-sizing: content; resize: none; border: 0; outline: 0; color: var(--ink); background: transparent; font-size: 15px; line-height: 1.65; }
.composer textarea::placeholder { color: #aab0ad; }
.composer-bottom { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; }
.input-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: #7e8883; font-size: 11px; }
.mini-button { width: 23px; height: 23px; border: 1px solid #ecece8; border-radius: 7px; }
.attachment-button {
  min-height: 29px; padding: 4px 9px; display: inline-flex; align-items: center; gap: 5px;
  border: 1px solid #e2e6e3; border-radius: 8px; background: #f8faf8;
  color: #53635c; cursor: pointer; font-size: 12px; white-space: nowrap;
}
.attachment-button:hover { border-color: #adc4b9; background: #f1f6f3; color: var(--green); }
.attachment-button span:first-child { font-size: 13px; }
.hidden-file-input { position: fixed; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.attachment-preview {
  margin: 0 0 10px; padding-bottom: 9px; display: flex; gap: 8px; overflow-x: auto;
  border-bottom: 1px solid #eeeee9;
}
.pending-attachment {
  position: relative; flex: 0 0 auto; max-width: 180px; min-height: 42px;
  padding: 6px 27px 6px 7px; display: flex; align-items: center; gap: 7px;
  border: 1px solid #dce1dd; border-radius: 8px; background: #f8faf8;
  color: #59665f; font-size: 11px;
}
.pending-attachment img { width: 38px; height: 34px; border-radius: 5px; object-fit: cover; cursor: zoom-in; }
.pending-attachment span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pending-copy { min-width: 0; display: grid; gap: 2px; }
.ocr-status { color: #75817b; font-size: 10px; line-height: 1.3; white-space: nowrap; }
.ocr-status.working { color: var(--green-2); }
.ocr-status.failed, .ocr-status.empty { color: #8a6347; }
.remove-attachment {
  position: absolute; right: 5px; top: 5px; width: 18px; height: 18px;
  padding: 0; border: 0; border-radius: 50%; background: #e8ece9; cursor: pointer;
  color: #6e7873; line-height: 1;
}
.send-button { padding: 6px 6px 6px 15px; display: flex; align-items: center; gap: 9px; border: 0; border-radius: 9px; color: #fff; background: var(--green); cursor: pointer; font-size: 13px; }
.send-button b { width: 24px; height: 24px; display: grid; place-items: center; border-radius: 7px; background: rgba(255,255,255,.13); font-size: 14px; }
.send-button:disabled { opacity: .45; cursor: wait; }
.disclaimer { margin: 9px 0 0; text-align: center; color: #7f8884; font-size: 10px; }

.modal-backdrop { position: fixed; inset: 0; z-index: 20; display: grid; place-items: center; padding: 22px; overflow-y: auto; overscroll-behavior: contain; background: rgba(25,39,34,.45); backdrop-filter: blur(6px); }
.modal { position: relative; width: min(860px, 100%); background: var(--paper); border-radius: 22px; box-shadow: var(--shadow); overflow: hidden; }
.auth-card { max-height: calc(100dvh - 44px); display: grid; grid-template-columns: 38% 62%; overflow-y: auto; }
.auth-visual { min-height: 570px; padding: 34px; display: grid; grid-template-rows: 1fr auto; place-items: center; gap: 28px; color: white; background: var(--green); background-image: radial-gradient(circle at 80% 20%, rgba(255,255,255,.12), transparent 28%), linear-gradient(145deg, transparent 55%, rgba(202,157,72,.12)); }
.auth-logo {
  width: min(100%, 250px); height: auto; max-height: 360px;
  align-self: center; justify-self: center; object-fit: contain;
  border-radius: 22%; filter: drop-shadow(0 18px 32px rgba(10, 35, 27, .2));
}
.auth-visual p { width: 100%; margin: 0; font: 700 27px/1.55 "Songti SC", serif; }
.auth-content { padding: 50px 56px 36px; overflow-y: auto; }
.auth-content h2, .security-card h2 { margin: 10px 0 12px; font: 700 27px/1.35 "Songti SC", serif; }
.auth-content > p:not(.eyebrow):not(.auth-note) { margin: 0 0 28px; color: #65716c; font-size: 14px; line-height: 1.65; }
.auth-content label { display: block; margin: 0 0 16px; }
.auth-content label span { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 650; }
.auth-content input { width: 100%; padding: 13px 14px; border: 1px solid #d7dad5; border-radius: 9px; outline: 0; background: #fff; font-size: 14px; }
.auth-content input:focus { border-color: #6c9c87; box-shadow: 0 0 0 3px rgba(74,130,105,.08); }
.auth-language-field { position: relative; max-width: 180px; }
.auth-language-field::after {
  content: "⌄"; position: absolute; right: 12px; bottom: 10px;
  color: var(--muted); pointer-events: none; font-size: 15px; line-height: 1;
}
.auth-language-field select {
  width: 100%; min-height: 40px; padding: 8px 34px 8px 12px;
  border: 1px solid var(--line); border-radius: 9px;
  appearance: none; -webkit-appearance: none;
  color: var(--ink); background: var(--paper); font-size: 13px; cursor: pointer;
}
.auth-language-field select:focus-visible {
  border-color: var(--green-2); outline: 3px solid color-mix(in srgb, var(--green) 12%, transparent);
}
.account-choices {
  display: flex !important; flex-wrap: wrap; gap: 6px; margin-top: 8px;
}
.account-choices.hidden { display: none !important; }
.account-choice {
  min-height: 30px; padding: 5px 10px; border: 1px solid var(--line);
  border-radius: 999px; color: var(--ink); background: var(--paper);
  cursor: pointer; font-size: 12px; font-weight: 650;
}
.account-choice:hover, .account-choice:focus-visible {
  border-color: var(--green-2); background: var(--mint); outline: none;
}
.primary-button, .secondary-button, .danger-button { border-radius: 9px; padding: 12px 16px; cursor: pointer; font-size: 13px; font-weight: 650; }
.primary-button { width: 100%; border: 0; background: var(--green); color: #fff; }
.primary-button:disabled { opacity: .55; cursor: wait; }
.auth-account-action {
  width: 100%; margin-top: 10px; padding: 10px 12px; border: 0;
  color: var(--ink); background: transparent; cursor: pointer;
  font-size: 12px; font-weight: 650; text-decoration: underline;
  text-underline-offset: 3px;
}
.auth-account-action:hover { color: var(--ink); background: color-mix(in srgb, var(--green) 8%, transparent); border-radius: 9px; }
.auth-account-action:focus-visible { outline: 3px solid color-mix(in srgb, var(--green) 24%, transparent); outline-offset: 2px; }
.form-error { min-height: 18px; margin: -3px 0 8px; color: var(--danger); font-size: 12px; }
.auth-note { margin: 22px 0 0; padding-top: 13px; border-top: 1px solid #e5e4dd; color: #7c8681; font-size: 11px; line-height: 1.65; }
.modal-close { position: absolute; right: 17px; top: 15px; font-size: 25px; color: #8b9691; }
.security-card { max-width: 650px; max-height: calc(100vh - 44px); padding: 38px; overflow-y: auto; }
.preferences {
  margin: 22px 0 8px; padding: 16px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
  border: 1px solid #e0e1db; border-radius: 11px; background: #fff;
}
.preferences label > span, .preferences legend {
  display: block; margin-bottom: 9px; color: #65716b; font-size: 12px; font-weight: 650;
}
.preferences select {
  width: 100%; padding: 9px 10px; border: 1px solid #d8dcd8;
  border-radius: 8px; color: var(--ink); background: #fff; outline: 0; font-size: 13px;
}
.preferences fieldset { margin: 0; padding: 0; border: 0; }
.bilingual-setting {
  grid-column: 1 / -1; min-height: 64px; padding: 12px 13px;
  display: flex; align-items: center; gap: 14px;
  border: 1px solid #e0e4e1; border-radius: 10px; background: #fdfefd; cursor: pointer;
}
.preferences label > .bilingual-copy { min-width: 0; flex: 1; margin: 0; color: inherit; }
.bilingual-copy strong { display: block; color: var(--ink); font-size: 13px; }
.bilingual-copy small { display: block; margin-top: 4px; color: #77827d; font-size: 11px; font-weight: 400; line-height: 1.45; }
.bilingual-setting input {
  position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none;
}
.switch-track {
  position: relative; width: 44px; height: 25px; flex: 0 0 44px;
  border-radius: 999px; background: #cbd2ce; transition: background .18s ease;
}
.switch-track::after {
  content: ""; position: absolute; left: 3px; top: 3px; width: 19px; height: 19px;
  border-radius: 50%; background: #fff; box-shadow: 0 2px 6px rgba(28,48,40,.22);
  transition: transform .18s ease;
}
.bilingual-setting input:checked + .switch-track { background: var(--green); }
.bilingual-setting input:checked + .switch-track::after { transform: translateX(19px); }
.bilingual-setting input:focus-visible + .switch-track { outline: 3px solid rgba(74,130,105,.2); outline-offset: 2px; }
.theme-options { display: flex; gap: 10px; }
.theme-options button {
  width: 27px; height: 27px; padding: 0; border: 3px solid #fff;
  border-radius: 50%; background: var(--swatch); cursor: pointer;
  box-shadow: 0 0 0 1px #d0d5d1;
}
.theme-options [data-theme="forest"] { --swatch: #245b4a; }
.theme-options [data-theme="ocean"] { --swatch: #315f82; }
.theme-options [data-theme="violet"] { --swatch: #66558d; }
.theme-options [data-theme="sunset"] { --swatch: #a85845; }
.theme-options button.active { box-shadow: 0 0 0 2px var(--swatch); }
.security-actions { display: flex; gap: 10px; margin-top: 24px; }
.secondary-button { border: 1px solid #ccd3cf; background: white; }
.logout-button { color: var(--green); }
.danger-button { border: 1px solid #e1bbb7; background: #fff7f6; color: var(--danger); }
.file-label { display: inline-flex; align-items: center; }
.file-label input { display: none; }
.camera-card { max-width: 720px; padding: 28px; }
.camera-heading { display: flex; align-items: flex-start; justify-content: space-between; }
.camera-heading h2 { margin: 4px 0 18px; font: 700 25px/1.3 "Songti SC", serif; }
.camera-heading .modal-close { position: static; }
.camera-viewport {
  position: relative; width: 100%; aspect-ratio: 16 / 10; overflow: hidden;
  display: grid; place-items: center; border-radius: 14px; background: #1d2127;
}
.camera-viewport video { width: 100%; height: 100%; display: block; object-fit: contain; }
.camera-loading {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: #e1e5e9; background: #1d2127; font-size: 14px;
}
.camera-hint { margin: 13px 0 20px; color: #68756f; font-size: 13px; line-height: 1.6; }
.camera-actions { display: flex; justify-content: flex-end; gap: 10px; }
.camera-capture { width: auto; min-width: 110px; }
.toast-region { position: fixed; right: 22px; bottom: 22px; z-index: 40; display: grid; gap: 8px; }
.toast { padding: 11px 15px; color: white; background: #263c34; border-radius: 9px; box-shadow: 0 8px 26px rgba(0,0,0,.16); font-size: 11px; animation: lineIn .25s ease; }
.selection-quote-button {
  position: fixed; z-index: 35; min-width: 58px; min-height: 36px; padding: 7px 12px;
  border: 1px solid var(--theme-border, var(--line)); border-radius: 10px;
  color: var(--ink); background: var(--theme-card, var(--white));
  box-shadow: 0 8px 24px rgba(0,0,0,.16); cursor: pointer;
  font-size: 12px; font-weight: 700; line-height: 1;
  animation: quoteButtonIn .12s ease-out;
  touch-action: manipulation;
}
.selection-quote-button:hover {
  border-color: var(--green-2); background: var(--theme-hover, var(--mint));
}
@keyframes quoteButtonIn {
  from { opacity: 0; transform: translateY(3px) scale(.97); }
  to { opacity: 1; transform: none; }
}

.sidebar, .chat-view, .security-card, .auth-card, .attachment-preview, .modal-backdrop {
  scrollbar-width: thin;
  scrollbar-color: rgba(71, 103, 91, .42) transparent;
}
.sidebar::-webkit-scrollbar, .chat-view::-webkit-scrollbar,
.security-card::-webkit-scrollbar, .auth-card::-webkit-scrollbar,
.attachment-preview::-webkit-scrollbar, .modal-backdrop::-webkit-scrollbar { width: 9px; height: 9px; }
.sidebar::-webkit-scrollbar-track, .chat-view::-webkit-scrollbar-track,
.security-card::-webkit-scrollbar-track, .auth-card::-webkit-scrollbar-track,
.attachment-preview::-webkit-scrollbar-track, .modal-backdrop::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb, .chat-view::-webkit-scrollbar-thumb,
.security-card::-webkit-scrollbar-thumb, .auth-card::-webkit-scrollbar-thumb,
.attachment-preview::-webkit-scrollbar-thumb, .modal-backdrop::-webkit-scrollbar-thumb {
  border: 3px solid transparent; border-radius: 999px; background: rgba(71, 103, 91, .42); background-clip: padding-box;
}

/* ── Quick action buttons ─────────────────────────────── */
.quick-actions {
  display: flex; gap: 6px; padding: 0 0 8px;
  justify-content: center; flex-wrap: wrap;
}
.quick-action-btn {
  padding: 5px 12px; border: 1px solid #dde3df; border-radius: 16px;
  background: #fff; cursor: pointer; font-size: 11px; font-weight: 600;
  color: var(--green); transition: all .15s;
  white-space: nowrap;
}
.quick-action-btn:hover {
  border-color: var(--green-2); background: var(--mint);
}

/* ── ThinkTree & Analogy cards ────────────────────────── */
.thinktree-card {
  margin: 8px 0; padding: 13px 15px; border-radius: 10px;
  border-left: 4px solid var(--green-2);
  background: #f8faf6; animation: lineIn .25s ease both;
}
.thinktree-card.recommended {
  border-left-color: #c99c48;
  background: #fdf9f2;
  box-shadow: 0 2px 10px rgba(201,156,72,.12);
}
.thinktree-card-inner { font-size: .95em; line-height: 1.7; }
.thinktree-card-inner strong { color: var(--green); }
.thinktree-card.recommended .thinktree-card-inner strong { color: #8a6520; }

.analogy-card {
  margin: 8px 0; padding: 13px 15px; border-radius: 10px;
  border-left: 4px solid #7b6fad;
  background: #f7f5fc; animation: lineIn .25s ease both;
}
.analogy-card-inner { font-size: .93em; line-height: 1.7; color: #4a3f6b; }

/* ── Concept cloud ────────────────────────────────────── */
.concept-cloud {
  display: flex; align-items: flex-start; gap: 10px;
  width: min(820px, 90%); margin: 0 auto; padding: 14px 0 20px;
  border-top: 1px solid var(--line);
}
.concept-cloud-label { font-size: 14px; flex-shrink: 0; padding-top: 2px; }
.concept-cloud-tags {
  display: flex; flex-wrap: wrap; gap: 5px;
}
.concept-tag {
  padding: 2px 9px; border: 1px solid #dae0dc; border-radius: 12px;
  background: #f7f9f7; font-size: 11px; color: #486355;
  white-space: nowrap;
}

@keyframes lineIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

@media (max-width: 1100px) and (orientation: portrait), (max-width: 780px) {
  .modal-backdrop { padding: max(12px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) max(12px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left)); }
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: fixed; z-index: 15; width: min(295px, 88vw); height: 100dvh; transform: translateX(-102%); transition: transform .22s; box-shadow: 20px 0 45px rgba(32,48,43,.14); }
  .sidebar.open { transform: none; }
  .sidebar-scrim {
    position: fixed; inset: 0; z-index: 14; display: block;
    padding: 0; border: 0; opacity: 0; pointer-events: none;
    background: rgba(20, 34, 29, .2); backdrop-filter: blur(1px);
    transition: opacity .2s ease; touch-action: manipulation;
  }
  .sidebar.open + .sidebar-scrim { opacity: 1; pointer-events: auto; }
  .sidebar-close, .menu-button { display: block; }
  .subject-button, .subject-new-chat, .archive-chat, .delete-chat { min-height: 44px; touch-action: manipulation; }
  .subject-new-chat { width: 44px; }
  .subject-row { grid-template-columns: minmax(0, 1fr) 44px; }
  .topbar { padding: 0 16px; }
  .topbar .course-title { margin-right: auto; margin-left: 10px; }
  .privacy-pill { display: none; }
  .welcome { width: 90%; padding-top: 5vh; }
  .suggestions { grid-template-columns: 1fr; }
  .suggestion { min-height: auto; }
  .messages, .composer-wrap { width: 92%; }
  .message-body { max-width: 84%; }
  .teaching-board { min-height: 210px; aspect-ratio: 4 / 3; }
  .auth-card { width: min(560px, 100%); max-height: calc(100dvh - 24px); grid-template-columns: 1fr; border-radius: 18px; }
  .auth-visual { min-height: 150px; padding: 18px 24px; grid-template: 1fr / minmax(76px, 130px) 1fr; gap: 22px; }
  .auth-logo { width: min(100%, 118px); max-height: 118px; border-radius: 20%; }
  .auth-visual p { margin-left: auto; font-size: clamp(16px, 3.2vw, 20px); text-align: right; }
  .auth-content { padding: clamp(24px, 5vw, 38px); }
  .auth-content h2 { font-size: clamp(23px, 5vw, 28px); }
  .auth-content > p:not(.eyebrow):not(.auth-note) { margin-bottom: 22px; }
  .auth-content input { min-height: 48px; font-size: 16px; }
  .auth-content .primary-button { min-height: 48px; }
  .security-card { padding: 30px 22px; }
  .preferences { grid-template-columns: 1fr; }
  .security-actions { flex-wrap: wrap; }
  .danger-button { margin-left: 0; }
  .camera-card { padding: 18px; }
  .camera-viewport { aspect-ratio: 4 / 5; }
  .attachment-button { padding: 4px 7px; }
}

/* ── PowerDoc ────────────────────────────────────────────── */

/* Sidebar entry - now at top, above subject-nav */
.powerdoc-nav {
  padding: 10px 0 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 0;
}
.powerdoc-sidebar-entry {
  width: 100%; padding: 10px 10px;
  display: flex; align-items: center; gap: 10px;
  border: 0; border-radius: 10px; background: transparent; cursor: pointer;
  color: var(--ink); font-size: 14px; font-weight: 600;
  transition: background .15s;
}
.powerdoc-sidebar-entry:hover,
.powerdoc-sidebar-entry.active { background: color-mix(in srgb, var(--green) 8%, transparent); }
.powerdoc-nav-icon { font-size: 18px; flex-shrink: 0; }
.powerdoc-nav-label { flex: 1; text-align: left; }
.powerdoc-nav-arrow { color: var(--muted); font-size: 16px; }

/* Manager page */
.powerdoc-manager {
  height: 100%; overflow-y: auto; overscroll-behavior: contain;
  padding: 0 32px 32px;
}
.powerdoc-manager-header {
  position: sticky; top: 0; z-index: 2;
  display: flex; align-items: center; justify-content: space-between;
  padding: 28px 0 20px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.powerdoc-manager-header h2 { margin: 0; font: 700 24px/1.3 "Songti SC", Georgia, serif; }
.powerdoc-manager-actions { display: flex; align-items: center; justify-content: flex-end; gap: 8px; }
.powerdoc-header-button {
  min-height: 34px; padding: 7px 11px; display: inline-flex; align-items: center;
  border: 1px solid var(--line); border-radius: 8px; color: var(--green);
  background: var(--white); cursor: pointer; font-size: 11px; font-weight: 650;
}
.powerdoc-header-button:hover, .powerdoc-header-button.active { border-color: var(--green-2); background: var(--mint); }
.powerdoc-new-button {
  padding: 6px 14px; border: 1px solid var(--green);
  border-radius: 8px; background: var(--green);
  color: #fff; cursor: pointer;
  font-size: 12px; font-weight: 650;
  transition: background .15s;
}
.powerdoc-new-button:hover { background: var(--green-2); }
.powerdoc-list {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px; padding-top: 20px;
}
.powerdoc-batch-bar {
  position: sticky; top: 88px; z-index: 3; margin: 12px 0 0; padding: 10px 12px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 9px;
  border: 1px solid var(--line); border-radius: 11px; background: var(--white);
  box-shadow: var(--soft-shadow); font-size: 12px;
}
.powerdoc-batch-bar > span { margin-right: auto; color: var(--muted); }
.powerdoc-batch-bar label { display: inline-flex; align-items: center; gap: 6px; }
.powerdoc-batch-bar button {
  min-height: 32px; padding: 6px 10px; border: 1px solid var(--line); border-radius: 8px;
  color: var(--green); background: transparent; cursor: pointer; font-size: 11px; font-weight: 650;
}
.powerdoc-batch-bar button:hover { background: var(--mint); }
.powerdoc-batch-bar button.danger { color: var(--danger); }
.powerdoc-batch-bar button:disabled { opacity: .45; cursor: not-allowed; }

/* Document card */
.powerdoc-card {
  position: relative;
  padding: 18px 20px;
  border: 1px solid var(--line); border-radius: 12px;
  background: #fff; cursor: pointer;
  transition: box-shadow .18s, border-color .18s;
}
.powerdoc-card-checkbox {
  position: absolute; top: 13px; right: 13px; width: 20px; height: 20px;
  accent-color: var(--green); opacity: 0; pointer-events: none;
}
.powerdoc-card.selection-mode { padding-right: 48px; }
.powerdoc-card.selection-mode .powerdoc-card-checkbox { opacity: 1; }
.powerdoc-card.selected {
  border-color: var(--green-2);
  background: color-mix(in srgb, var(--mint) 58%, var(--white));
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--green-2) 20%, transparent);
}
.powerdoc-card:hover {
  border-color: var(--green-2);
  box-shadow: 0 6px 22px rgba(26,48,40,.08);
}
.powerdoc-card h3 {
  margin: 0 0 6px; font-size: 15px; font-weight: 700;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.powerdoc-card p {
  margin: 0; color: var(--muted); font-size: 12px; line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden;
}
.powerdoc-card time {
  display: block; margin-top: 10px;
  color: #9aa8a2; font-size: 11px;
}

/* Editor */
.powerdoc-editor {
  height: 100%; display: flex; flex-direction: column; overflow: hidden;
}
.powerdoc-editor-topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid var(--line);
}
.main.powerdoc-view { grid-template-rows: minmax(0, 1fr); }
.main.powerdoc-view > .topbar { display: none; }
.main.powerdoc-view > .powerdoc-manager,
.main.powerdoc-editing > .powerdoc-editor { grid-row: 1; }
.powerdoc-back-button {
  padding: 6px 0; color: var(--green-2); font-size: 13px; font-weight: 600;
}
.powerdoc-editor-actions {
  display: flex; align-items: center; gap: 12px;
}
.powerdoc-delete-button {
  padding: 6px 12px; border: 1px solid #e1bbb7; border-radius: 7px;
  background: #fff7f6; color: var(--danger); cursor: pointer;
  font-size: 12px; font-weight: 600; white-space: nowrap;
  transition: background .15s;
}
.powerdoc-read-button {
  min-height: 32px; padding: 6px 12px; border: 1px solid #cbdad2; border-radius: 9px;
  color: var(--green); background: #f3f8f5; cursor: pointer; font-size: 12px; font-weight: 650;
}
.powerdoc-read-button:hover, .powerdoc-read-button[aria-pressed="true"] { color: #fff; background: var(--green); }
.powerdoc-delete-button:hover { background: #fce8e5; }
.powerdoc-save-status {
  color: var(--muted); font-size: 11px; min-width: 70px; text-align: right;
}
.powerdoc-save-status.saved { color: var(--green-2); }

.powerdoc-title-input {
  width: 100%; padding: 24px 32px 12px;
  border: 0; border-bottom: 1px solid transparent;
  background: transparent;
  font: 700 26px/1.35 "Songti SC", Georgia, serif;
  color: var(--ink); outline: none;
}
.powerdoc-title-input:focus { border-bottom-color: var(--line); }
.powerdoc-title-input::placeholder { color: #bcc4c0; }

.powerdoc-editor-body {
  flex: 1; overflow-y: auto; overscroll-behavior: contain;
  display: flex; flex-direction: column;
}

/* Toolbar */
.powerdoc-editor-toolbar {
  position: sticky; top: 0; z-index: 12;
  display: flex; gap: 4px; padding: 6px 28px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.powerdoc-editor-toolbar button {
  width: 30px; height: 30px; padding: 0; border: 0; border-radius: 6px;
  background: transparent; cursor: pointer;
  font-size: 13px; font-weight: 700; color: var(--muted);
  display: grid; place-items: center; transition: background .12s;
}
.powerdoc-editor-toolbar button:hover,
.powerdoc-editor-toolbar button.active {
  background: var(--mint); color: var(--green);
}
.powerdoc-editor-toolbar button i { font-weight: 400; }
.doc-text-color {
  position: relative; width: 30px; height: 30px; display: grid; place-items: center;
  border-radius: 6px; color: var(--muted); cursor: pointer; font-size: 13px; font-weight: 800;
}
.doc-text-color:hover { color: var(--green); background: var(--mint); }
.doc-text-color::after {
  content: ""; position: absolute; left: 7px; right: 7px; bottom: 4px; height: 3px;
  border-radius: 99px; background: var(--doc-text-swatch, #245b4a);
}
.doc-text-color input {
  position: absolute; inset: 0; width: 100%; height: 100%; padding: 0;
  border: 0; opacity: 0; cursor: pointer;
}

/* Content editor */
.powerdoc-content-editor {
  flex: 1; padding: 20px 32px 60px;
  font-size: 15px; line-height: 1.85; color: var(--ink);
  outline: none; caret-color: var(--green);
  min-height: 300px;
}
.powerdoc-content-editor:empty::before {
  content: attr(data-placeholder);
  color: #bcc4c0; pointer-events: none;
}
.powerdoc-content-editor h1 { font-size: 1.65em; font-weight: 750; margin: .8em 0 .3em; }
.powerdoc-content-editor h2 { font-size: 1.35em; font-weight: 750; margin: .7em 0 .25em; }
.powerdoc-content-editor h3 { font-size: 1.15em; font-weight: 750; margin: .55em 0 .2em; }
.powerdoc-content-editor h4 { font-size: 1.05em; font-weight: 750; margin: .5em 0 .18em; }
.powerdoc-content-editor h5 { font-size: .98em; font-weight: 750; margin: .45em 0 .16em; }
.powerdoc-content-editor h6 { font-size: .92em; font-weight: 750; margin: .4em 0 .14em; color: var(--muted); }
.powerdoc-content-editor p { margin: .15em 0 .55em; }
.powerdoc-content-editor ul, .powerdoc-content-editor ol {
  margin: .25em 0 .6em; padding-left: 1.6em;
}
.powerdoc-content-editor li { margin: .12em 0; }
.powerdoc-content-editor blockquote {
  margin: .45em 0; padding: .5em .8em;
  border-left: 3px solid var(--green-2); border-radius: 0 8px 8px 0;
  color: #53675e; background: rgba(223,236,229,.4);
}
.powerdoc-content-editor code {
  padding: .12em .35em; border: 1px solid #dce2de; border-radius: 5px;
  color: #31594a; background: #f2f5f3; font: .9em/1.4 Consolas, monospace;
}
.powerdoc-content-editor pre {
  margin: .55em 0; padding: 14px 16px; overflow: auto;
  border-radius: 10px; color: #e7efeb; background: #21332c;
  font: 12.5px/1.6 Consolas, monospace; tab-size: 2;
}
.powerdoc-content-editor pre code {
  padding: 0; border: 0; background: transparent; color: inherit; font-size: inherit;
}
.powerdoc-content-editor hr {
  margin: .75em 0; border: 0; border-top: 1px solid #dce0dd;
}
.powerdoc-content-editor strong { font-weight: 750; }
.powerdoc-content-editor em { font-style: italic; color: #435c52; }
.powerdoc-content-editor del { color: #7d8883; text-decoration: line-through; }

/* Insert modal */
.insert-doc-card { max-width: 480px; }
.insert-doc-list {
  max-height: 280px; overflow-y: auto; margin: 14px 0;
  display: flex; flex-direction: column; gap: 6px;
}
.insert-doc-item {
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 9px;
  background: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: space-between;
  transition: border-color .14s, background .14s;
}
.insert-doc-item:hover { border-color: var(--green-2); background: var(--mint); }
.insert-doc-item strong {
  font-size: 14px; font-weight: 650;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.insert-doc-item small { color: var(--muted); font-size: 11px; flex-shrink: 0; margin-left: 10px; }
.insert-doc-actions {
  display: flex; justify-content: flex-end; padding-top: 6px;
}

/* ── Enhanced Editor: math, code blocks, images, tables ── */

.toolbar-sep {
  width: 1px; height: 18px; margin: 0 5px;
  background: var(--line); align-self: center;
}

/* Math formula (KaTeX rendered, read-only in editor) */
.powerdoc-content-editor .doc-math {
  display: inline-block; vertical-align: -.1em;
  padding: .08em .25em; margin: 0 .08em;
  border-radius: 5px; background: rgba(223,236,229,.35);
  cursor: pointer; user-select: none;
  transition: background .15s;
}
.powerdoc-content-editor .doc-math:hover {
  background: rgba(223,236,229,.6);
  outline: 1px dashed var(--green-2);
}
.powerdoc-content-editor .doc-math-block {
  display: block; width: 100%; margin: .55em 0; padding: .45em .5em;
  text-align: center; border-radius: 8px;
  background: rgba(223,236,229,.3);
  cursor: pointer; user-select: none; overflow-x: auto;
}
.powerdoc-content-editor .doc-math-block:hover {
  background: rgba(223,236,229,.55);
  outline: 1px dashed var(--green-2);
}
.powerdoc-content-editor .doc-math .katex,
.powerdoc-content-editor .doc-math-block .katex {
  font-size: 1.05em;
}
.powerdoc-content-editor .doc-math-block .katex-display {
  margin: .2em 0;
}

/* Code blocks */
.powerdoc-content-editor .doc-code-block {
  position: relative; margin: .55em 0; border-radius: 10px;
  background: #20252b; overflow: hidden;
}
.powerdoc-content-editor .doc-code-lang {
  display: block; width: 100%; padding: 6px 14px 4px;
  border: 0; background: transparent;
  color: #7da894; font: 600 10px/1.4 Inter, sans-serif;
  text-transform: uppercase; letter-spacing: .08em; outline: none;
}
.powerdoc-content-editor .doc-code-lang::placeholder { color: #567566; }
.powerdoc-content-editor .doc-code-body {
  display: block; width: 100%; padding: 8px 14px 14px;
  border: 0; background: transparent; outline: none; resize: none;
  color: #dceaec; font: 12.5px/1.65 Consolas, "SFMono-Regular", monospace;
  tab-size: 2; white-space: pre-wrap; word-break: normal; overflow-wrap: normal;
  min-height: 60px;
}

/* Images in editor */
.powerdoc-content-editor .doc-image {
  max-width: 100%; height: auto; max-height: 420px;
  display: block; margin: .5em 0; border-radius: 9px;
  border: 1px solid var(--line); cursor: zoom-in;
}

/* Full-screen viewer shared by chat attachments and PowerDoc images. */
body.image-viewer-open { overflow: hidden; }
.image-viewer {
  position: fixed; inset: 0; z-index: 1000;
  display: grid; place-items: center;
  padding: max(64px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) max(20px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));
  background: rgba(7, 10, 9, .9); backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.image-viewer figure {
  width: min-content; max-width: 96vw; max-height: 90dvh;
  margin: 0; display: grid; justify-items: center; gap: 10px;
}
.image-viewer img {
  display: block; max-width: min(96vw, 1440px); max-height: calc(90dvh - 42px);
  width: auto; height: auto; object-fit: contain; border-radius: 12px;
  background: #111; box-shadow: 0 22px 70px rgba(0, 0, 0, .45);
  touch-action: pinch-zoom;
}
.image-viewer figcaption {
  max-width: min(92vw, 820px); overflow: hidden; text-overflow: ellipsis;
  color: #fff; font-size: 14px; line-height: 1.45; text-align: center;
}
.image-viewer-close {
  position: fixed; top: max(14px, env(safe-area-inset-top)); right: max(14px, env(safe-area-inset-right));
  z-index: 1; width: 44px; height: 44px; padding: 0;
  border: 1px solid rgba(255, 255, 255, .3); border-radius: 50%;
  background: rgba(255, 255, 255, .14); color: #fff;
  font: 300 30px/1 system-ui, sans-serif; cursor: pointer;
}
.image-viewer-close:hover { background: rgba(255, 255, 255, .24); }
.image-viewer-close:focus-visible { outline: 3px solid #fff; outline-offset: 3px; }
.powerdoc-content-editor .doc-image-wrap {
  position: relative; display: inline-block; max-width: 100%;
}
.powerdoc-content-editor .doc-image-wrap:hover .doc-image-remove {
  opacity: 1;
}
.powerdoc-content-editor .doc-image-remove {
  position: absolute; top: 6px; right: 6px;
  width: 24px; height: 24px; padding: 0; border: 0; border-radius: 50%;
  background: rgba(0,0,0,.55); color: #fff; cursor: pointer;
  font-size: 14px; line-height: 1; opacity: 0; transition: opacity .15s;
  display: grid; place-items: center;
}

/* Tables */
.powerdoc-content-editor .doc-table {
  margin: .55em 0; border-collapse: collapse; font-size: .92em;
  width: auto; max-width: 100%; overflow-x: auto; display: block;
}
.powerdoc-content-editor .doc-table table {
  border-collapse: collapse; width: auto;
}
.powerdoc-content-editor .doc-table th,
.powerdoc-content-editor .doc-table td {
  padding: 6px 12px; border: 1px solid #d0d8d3;
  min-width: 60px; text-align: left;
}
.powerdoc-content-editor .doc-table th {
  background: #edf3ef; font-weight: 700; color: #294b3e;
}
.powerdoc-content-editor .doc-table td {
  background: #fff;
}

/* Link hover */
.powerdoc-content-editor a {
  color: var(--green-2); text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── Message actions (copy, regenerate) ───────────────── */
.message-actions {
  display: flex; gap: 2px; margin-top: 8px; opacity: 0;
  transition: opacity .18s;
}
.message:hover .message-actions,
.message:focus-within .message-actions { opacity: 1; }
.message-action-btn {
  width: 28px; height: 28px; padding: 0; border: 0; border-radius: 6px;
  background: transparent; cursor: pointer; font-size: 13px;
  color: var(--muted); display: grid; place-items: center;
  transition: background .12s, color .12s;
}
.message-action-btn:hover { background: var(--mint); color: var(--green); }
.message-action-btn.done { color: var(--green); }

/* ── Conversation search ──────────────────────────────── */
.conversation-search {
  width: calc(100% - 20px); margin: 6px 10px 1px; padding: 7px 10px;
  border: 1px solid var(--line); border-radius: 8px;
  background: #fff; font-size: 12px; color: var(--ink); outline: none;
}
.conversation-search:focus { border-color: var(--green-2); }
.conversation-search::placeholder { color: #b0bab5; }
.subject-nav-actions { display: flex; align-items: center; gap: 4px; }

/* ── Network status ───────────────────────────────────── */
.privacy-pill.offline i { background: #c99c48; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

@media (hover: none) {
  .archive-chat, .delete-chat { opacity: 1; }
}

@media (max-width: 480px) {
  .auth-visual { min-height: 112px; padding: 13px 18px; grid-template-columns: 76px 1fr; gap: 14px; }
  .auth-logo { width: 76px; max-height: 76px; }
  .auth-visual p { font-size: 15px; }
  .auth-content { padding: 22px 18px 20px; }
  .auth-content .eyebrow { font-size: 10px; letter-spacing: .1em; }
  .auth-content h2 { margin-top: 8px; font-size: 22px; }
  .auth-note { margin-top: 18px; }
  .export-chat-button { padding: 6px 8px; gap: 5px; font-size: 11px; }
}

/* ── Ramizom visual refresh ──────────────────────────── */
:root {
  --paper: #f8faf8;
  --panel: #eef3ef;
  --line: #dbe4de;
  --ink: #172a23;
  --muted: #6d7d75;
  --shadow: 0 24px 70px rgba(22, 54, 42, .13);
  --soft-shadow: 0 10px 32px rgba(25, 60, 46, .075);
}
:root[data-theme="forest"] {
  --paper: #f8faf8; --panel: #eef3ef; --line: #dbe4de; --ink: #1f2328; --muted: #6b7178;
}
:root[data-theme="ocean"] {
  --paper: #f7fafc; --panel: #edf3f7; --line: #d8e3ea; --ink: #1f2328; --muted: #6b7178;
}
:root[data-theme="violet"] {
  --paper: #faf8fc; --panel: #f1edf6; --line: #e2daea; --ink: #1f2328; --muted: #6b7178;
}
:root[data-theme="sunset"] {
  --paper: #fcf9f7; --panel: #f5eeeb; --line: #eadbd5; --ink: #1f2328; --muted: #6b7178;
}

body {
  background:
    radial-gradient(circle at 72% -10%, color-mix(in srgb, var(--green) 12%, transparent), transparent 34%),
    var(--paper);
  font-family: Inter, "SF Pro Text", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app-shell { grid-template-columns: 286px minmax(0, 1fr); }
.sidebar {
  padding: 22px 16px 16px;
  border-right-color: rgba(64, 94, 81, .12);
  background:
    linear-gradient(180deg, rgba(255,255,255,.54), transparent 26%),
    var(--panel);
}
.brand { padding: 2px 8px 20px; gap: 11px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 13px;
  box-shadow: 0 7px 20px rgba(29, 73, 56, .16);
}
.brand strong { font: 750 15px/1.2 Inter, "PingFang SC", sans-serif; letter-spacing: -.01em; }
.brand span { margin-top: 3px; font-size: 10px; font-weight: 700; letter-spacing: .17em; text-transform: uppercase; }

.powerdoc-nav {
  margin: 0 2px 14px; padding: 7px 0 14px;
  border-bottom-color: rgba(64, 94, 81, .12);
}
.powerdoc-sidebar-entry {
  min-height: 43px; padding: 9px 11px; border: 1px solid transparent;
  border-radius: 12px; color: #40564c;
}
.powerdoc-sidebar-entry:hover,
.powerdoc-sidebar-entry.active {
  border-color: rgba(54, 104, 83, .12);
  background: rgba(255,255,255,.72);
  box-shadow: 0 5px 18px rgba(35, 68, 54, .055);
}
.powerdoc-nav-icon { display: grid; width: 26px; height: 26px; place-items: center; border-radius: 8px; background: #dfeae4; font-size: 14px; }

.subject-nav-heading { padding: 0 9px 8px; }
.eyebrow { color: #7a8a82; font-size: 10px; letter-spacing: .16em; }
.conversation-search {
  width: calc(100% - 12px); min-height: 38px; margin: 2px 6px 8px; padding: 8px 12px;
  border-color: transparent; border-radius: 11px; background: rgba(255,255,255,.72);
  box-shadow: inset 0 0 0 1px rgba(66, 91, 80, .10);
}
.conversation-search:focus {
  border-color: color-mix(in srgb, var(--green) 35%, transparent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--green) 9%, transparent);
}
.subject-group { margin: 2px 0 4px; }
.subject-button { min-height: 43px; padding: 7px 8px; border-radius: 12px; }
.subject-button:hover { background: rgba(255,255,255,.62); }
.subject-button.active {
  background: rgba(255,255,255,.92);
  box-shadow: 0 7px 22px rgba(33, 67, 53, .07);
}
.subject-emoji { width: 30px; height: 30px; border-radius: 9px; background: rgba(255,255,255,.72); }
.subject-new-chat { border-radius: 10px; }
.subject-conversations { margin-left: 24px; border-left-color: rgba(71, 106, 91, .20); }
.conversation-item { border-radius: 10px; }
.sidebar-footer { border-top-color: rgba(64, 94, 81, .12); }
.profile-button { border-radius: 12px; }
.profile-button:hover { background: rgba(255,255,255,.58); }

.main { grid-template-rows: 70px minmax(0,1fr) auto; }
.topbar {
  padding: 0 28px;
  border-bottom: 1px solid rgba(64, 94, 81, .10);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(18px);
}
.course-title { gap: 10px; }
.subject-icon { width: 36px; height: 36px; border-radius: 11px; box-shadow: inset 0 0 0 1px rgba(52, 105, 83, .08); }
.course-title strong { font-size: 14px; font-weight: 750; }
.mode-switcher {
  padding: 3px; gap: 2px; border: 1px solid rgba(60, 91, 78, .10);
  border-radius: 12px; background: color-mix(in srgb, var(--panel) 82%, transparent);
}
.mode-btn {
  width: auto; min-width: 92px; height: 32px; padding: 0 10px;
  display: inline-flex; grid-auto-flow: initial; align-items: center; justify-content: center; gap: 6px;
  border-radius: 9px; filter: grayscale(.15); font-size: 11px; font-weight: 680; white-space: nowrap;
}
.mode-btn > span:first-child { font-size: 14px; line-height: 1; }
.mode-btn:hover { background: rgba(255,255,255,.75); }
.mode-btn.active { background: #fff; box-shadow: 0 3px 10px rgba(31, 65, 51, .10); }
.privacy-pill { border: 1px solid color-mix(in srgb, var(--green) 14%, transparent); background: color-mix(in srgb, var(--mint) 76%, transparent); }
.export-chat-button {
  min-height: 36px; border-color: rgba(51, 100, 80, .18); border-radius: 11px;
  background: rgba(255,255,255,.74); box-shadow: 0 3px 12px rgba(34, 67, 53, .04);
}

.chat-view {
  background: transparent;
}
.welcome { width: min(800px, 88%); padding-top: clamp(58px, 11vh, 118px); }
.welcome h1 {
  margin: 12px 0 14px;
  font: 750 clamp(29px, 3vw, 43px)/1.2 Inter, "PingFang SC", sans-serif;
  letter-spacing: -.035em;
}
.welcome-copy { max-width: 560px; color: #677970; font-size: 14px; line-height: 1.75; }
.suggestions { margin-top: 34px; gap: 13px; }
.suggestion {
  min-height: 108px; padding: 18px 19px; border-color: rgba(68, 99, 85, .12);
  border-radius: 15px; background: rgba(255,255,255,.64);
  box-shadow: 0 8px 28px rgba(33, 65, 52, .045);
  backdrop-filter: blur(8px);
}
.suggestion:hover {
  transform: translateY(-3px); border-color: color-mix(in srgb, var(--green) 28%, transparent);
  background: rgba(255,255,255,.92); box-shadow: 0 16px 38px rgba(35, 75, 58, .10);
}
.suggestion span { font-size: 10px; font-weight: 750; letter-spacing: .09em; text-transform: uppercase; }
.suggestion strong { font-size: 13px; line-height: 1.65; }

.messages { width: min(850px, 90%); padding-top: 34px; }
.message { margin-bottom: 30px; gap: 12px; }
.message-avatar { width: 34px; height: 34px; border-radius: 11px; box-shadow: 0 5px 14px rgba(35, 71, 56, .10); }
.message.user .message-body {
  padding: 10px 14px; border: 1px solid rgba(58, 90, 77, .08);
  border-radius: 15px 5px 15px 15px; background: #edf1ee;
}
.message-text { color: var(--ink); font-size: 15px; line-height: 1.8; }
.message-meta { margin-top: 6px; font-size: 10px; opacity: .72; }
.message-actions { margin-top: 5px; }
.message-action-btn { border-radius: 8px; }

.composer-wrap {
  width: min(850px, 90%); padding: 0 0 max(14px, env(safe-area-inset-bottom));
  background: linear-gradient(180deg, transparent, var(--paper) 28%);
}
.composer {
  padding: 11px 12px 9px 15px; border-color: rgba(59, 92, 78, .18);
  border-radius: 17px; background: rgba(255,255,255,.93);
  box-shadow: 0 16px 48px rgba(27, 65, 49, .12), 0 1px 0 rgba(255,255,255,.8) inset;
  backdrop-filter: blur(16px);
}
.composer:focus-within {
  border-color: color-mix(in srgb, var(--green) 45%, transparent);
  box-shadow: 0 18px 52px rgba(27, 35, 49, .14), 0 0 0 3px color-mix(in srgb, var(--green) 7%, transparent);
}
.composer textarea { min-height: 31px; font-size: 14px; line-height: 1.6; }
.attachment-button {
  min-height: 28px; border-color: transparent; border-radius: 8px; background: var(--panel);
}
.attachment-button:hover { color: var(--green); background: var(--mint); }
.send-button { min-height: 34px; border-radius: 11px; box-shadow: 0 6px 16px rgba(29, 80, 60, .18); }
.quick-actions { margin: 9px 3px 0; justify-content: center; gap: 6px; }
.quick-action-btn {
  min-height: 28px; padding: 4px 10px; border-color: rgba(69, 98, 85, .12);
  border-radius: 999px; background: rgba(255,255,255,.52); color: #687970; font-size: 10px;
}
.disclaimer { margin-top: 8px; font-size: 9px; color: #9aa69f; }

.concept-cloud { width: min(850px, 90%); border-top-color: rgba(68, 99, 85, .10); }
.concept-tag { border-color: transparent; background: #e8f0eb; }

.powerdoc-manager { padding: 0 clamp(22px, 4vw, 54px) 42px; }
.powerdoc-manager-header { padding: 28px 0 18px; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(14px); }
.powerdoc-manager-header h2 { font: 750 26px/1.25 Inter, "PingFang SC", sans-serif; letter-spacing: -.03em; }
.powerdoc-new-button { min-height: 36px; border-radius: 10px; box-shadow: 0 6px 16px rgba(31, 84, 63, .14); }
.powerdoc-list { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; }
.powerdoc-card {
  min-height: 150px; padding: 19px 20px; border-color: rgba(64, 94, 81, .12);
  border-radius: 15px; background: rgba(255,255,255,.72); box-shadow: 0 8px 26px rgba(31, 63, 50, .04);
}
.powerdoc-card:hover { transform: translateY(-2px); box-shadow: 0 16px 36px rgba(31, 68, 52, .09); }
.powerdoc-editor-topbar { background: color-mix(in srgb, var(--paper) 90%, transparent); backdrop-filter: blur(14px); }
.powerdoc-title-input, .powerdoc-content-editor { width: min(860px, 100%); margin-inline: auto; }
.powerdoc-title-input { padding-top: 34px; font-family: Inter, "PingFang SC", sans-serif; letter-spacing: -.025em; }
.powerdoc-editor-toolbar {
  justify-content: center; padding-block: 7px; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(14px);
}
.powerdoc-editor-toolbar button { border-radius: 8px; }
.powerdoc-editor-toolbar button[data-doc-command^="heading"] { width: 28px; font-size: 10px; }
.powerdoc-editor.reading .powerdoc-editor-toolbar { display: none; }
.powerdoc-editor.reading .powerdoc-title-input {
  padding-top: 54px; border-bottom: 0; cursor: default;
}
.powerdoc-editor.reading .powerdoc-content-editor {
  max-width: 780px; padding-top: 28px; font-size: 16px; line-height: 1.95; cursor: default;
}
.powerdoc-editor.reading .powerdoc-content-editor:focus { outline: none; }
.powerdoc-editor.reading .powerdoc-ink-canvas { pointer-events: none; }
.ink-toolbar { display: inline-flex; align-items: center; gap: 4px; }
.powerdoc-editor-toolbar .ink-tool {
  width: auto; min-width: 56px; padding: 0 8px;
  display: inline-flex; align-items: center; justify-content: center; gap: 5px;
  font-size: 11px; font-weight: 650; white-space: nowrap;
}
.powerdoc-editor-toolbar .ink-tool > span:first-child { font-size: 13px; line-height: 1; }
.powerdoc-editor-toolbar .ink-color {
  width: 20px; height: 20px; border: 2px solid #fff; border-radius: 50%;
  background: var(--ink-color); box-shadow: 0 0 0 1px rgba(36,57,48,.18);
}
.powerdoc-editor-toolbar .ink-color[data-ink-color="#245b4a"] { --ink-color: #245b4a; }
.powerdoc-editor-toolbar .ink-color[data-ink-color="#2563eb"] { --ink-color: #2563eb; }
.powerdoc-editor-toolbar .ink-color[data-ink-color="#dc2626"] { --ink-color: #dc2626; }
.powerdoc-editor-toolbar .ink-color[data-ink-color="#111827"] { --ink-color: #111827; }
.powerdoc-editor-toolbar .ink-color[data-ink-color="#ffd84d"] { --ink-color: #ffd84d; }
.powerdoc-editor-toolbar .ink-color.active { box-shadow: 0 0 0 2px var(--paper), 0 0 0 4px var(--green-2); }
.powerdoc-editor-toolbar .ink-tool.active { color: #fff; background: var(--green); }
.ink-size-control {
  min-height: 32px; padding: 0 6px 0 8px; display: inline-flex; align-items: center; gap: 5px;
  border: 1px solid var(--line); border-radius: 8px; color: var(--muted);
  background: var(--white); font-size: 10px; font-weight: 650; white-space: nowrap;
}
.ink-size-control select {
  width: auto; min-width: 42px; padding: 3px 18px 3px 5px;
  border: 0; outline: 0; color: var(--ink); background: transparent; font: inherit;
}
.powerdoc-editor-body { position: relative; }
.powerdoc-ink-canvas {
  position: absolute; left: 0; z-index: 4; display: block;
  pointer-events: none; touch-action: none; cursor: crosshair;
}
.powerdoc-ink-canvas.active { pointer-events: auto; }
.powerdoc-content-editor.ink-disabled { user-select: none; }

.quiz-card {
  width: min(100%, 620px); margin: 12px 0; padding: 20px;
  border: 1px solid rgba(65,102,86,.15); border-radius: 18px;
  background: linear-gradient(145deg, #fff, #f4f8f5); box-shadow: var(--soft-shadow);
}
.quiz-header { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 9px; }
.quiz-header > span { padding: 3px 7px; border-radius: 6px; color: #fff; background: var(--green); font-size: 9px; font-weight: 800; letter-spacing: .12em; }
.quiz-header strong { font-size: 13px; }
.quiz-header small { color: var(--muted); font-size: 10px; }
.quiz-progress { height: 4px; margin: 12px 0 18px; overflow: hidden; border-radius: 99px; background: #e3ebe6; }
.quiz-progress i { display: block; height: 100%; border-radius: inherit; background: var(--green-2); transition: width .25s ease; }
.quiz-card h3 { margin: 0 0 14px; font-size: 16px; line-height: 1.55; }
.quiz-options { display: grid; gap: 8px; }
.quiz-options button {
  width: 100%; padding: 10px 12px; display: grid; grid-template-columns: 28px 1fr; align-items: center; gap: 8px;
  border: 1px solid #dce5df; border-radius: 11px; color: var(--ink); background: rgba(255,255,255,.82);
  cursor: pointer; text-align: left; font: inherit; transition: border-color .15s, background .15s, transform .15s;
}
.quiz-options button:hover:not(:disabled) { transform: translateY(-1px); border-color: var(--green-2); background: #fff; }
.quiz-options button b { width: 26px; height: 26px; display: grid; place-items: center; border-radius: 8px; color: var(--green); background: var(--mint); font-size: 11px; }
.quiz-options button.correct { border-color: #70a98d; background: #edf8f1; }
.quiz-options button.wrong { border-color: #d58b83; background: #fff2f0; }
.quiz-feedback { margin-top: 13px; padding: 10px 12px; border-radius: 10px; color: #43584f; background: #eaf2ed; font-size: 12px; line-height: 1.6; }
.quiz-next { margin: 12px 0 0 auto; padding: 8px 14px; display: block; border: 0; border-radius: 9px; color: #fff; background: var(--green); cursor: pointer; }
.quiz-result { padding: 28px 10px; display: grid; justify-items: center; gap: 8px; text-align: center; }
.quiz-result > span { font-size: 34px; }.quiz-result strong { font-size: 28px; }.quiz-result p { margin: 0; color: var(--muted); }

.mindmap-card {
  width: min(100%, 680px); margin: 12px 0; padding: 18px;
  border: 1px solid rgba(65,102,86,.14); border-radius: 18px; background: #fbfdfb; box-shadow: var(--soft-shadow);
}
.mindmap-card figcaption { margin-bottom: 16px; display: flex; align-items: center; justify-content: center; gap: 8px; }
.mindmap-card figcaption strong { font-size: 16px; }
.mindmap-branches { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 11px; }
.mindmap-branch { position: relative; padding: 12px; border-top: 3px solid var(--branch); border-radius: 12px; background: color-mix(in srgb, var(--branch) 7%, white); }
.mindmap-branch.branch-0 { --branch:var(--green-2); }.mindmap-branch.branch-1 { --branch:#b57628; }
.mindmap-branch.branch-2 { --branch:#66558d; }.mindmap-branch.branch-3 { --branch:#315f82; }.mindmap-branch.branch-4 { --branch:#a85845; }
.mindmap-branch > strong { display: block; margin-bottom: 8px; color: var(--branch); font-size: 13px; }
.mindmap-children { display: grid; gap: 6px; }
.mindmap-children span { padding: 6px 8px; border-radius: 8px; background: rgba(255,255,255,.82); font-size: 11px; line-height: 1.45; }

.modal-backdrop { background: rgba(19, 35, 29, .48); backdrop-filter: blur(12px); }
.modal { border: 1px solid rgba(255,255,255,.7); box-shadow: 0 35px 100px rgba(12, 35, 26, .26); }
.auth-card { grid-template-columns: 40% 60%; border-radius: 24px; }
.auth-visual {
  background:
    radial-gradient(circle at 50% 35%, rgba(255,255,255,.13), transparent 34%),
    linear-gradient(155deg, color-mix(in srgb, var(--green) 88%, #111), color-mix(in srgb, var(--green) 78%, #fff));
}
.auth-logo { filter: drop-shadow(0 16px 30px rgba(4, 29, 20, .22)); }
.auth-content { padding: 48px 54px 38px; }
.auth-content h2 { font-family: Inter, "PingFang SC", sans-serif; letter-spacing: -.025em; }
.auth-content input, .preferences select {
  border-color: rgba(65, 92, 80, .18); border-radius: 11px; background: rgba(255,255,255,.78);
}
.auth-content input:focus, .preferences select:focus {
  border-color: color-mix(in srgb, var(--green) 55%, transparent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--green) 9%, transparent);
}
.primary-button, .secondary-button, .danger-button { min-height: 42px; border-radius: 11px; }
.security-card { border-radius: 20px; }

@media (max-width: 780px) {
  .topbar { height: 64px; padding: 0 12px; }
  .main { grid-template-rows: 64px minmax(0,1fr) auto; }
  .mode-switcher { margin-left: auto; }
  .top-actions { gap: 6px; }
  .export-chat-button span:last-child { display: none; }
  .export-chat-button { width: 36px; padding: 0; justify-content: center; }
  .welcome { width: 88%; padding-top: 38px; }
  .welcome h1 { font-size: clamp(27px, 8vw, 36px); }
  .suggestions { gap: 9px; }
  .suggestion { min-height: 82px; padding: 14px 16px; }
  .messages, .composer-wrap, .concept-cloud { width: calc(100% - 26px); }
  .composer-bottom { align-items: flex-end; }
  .input-meta { gap: 4px; }
  .attachment-button { padding-inline: 7px; }
  .attachment-button span:last-child { display: none; }
  .quick-actions { overflow-x: auto; justify-content: flex-start; scrollbar-width: none; }
  .quick-action-btn { flex: 0 0 auto; }
  .mode-btn { min-width: 0; padding-inline: 8px; }
  .mode-btn > span:last-child { display: none; }
  .mindmap-branches { grid-template-columns: 1fr; }
  .auth-card { grid-template-columns: 1fr; }
  .auth-visual { border-radius: 22px 22px 0 0; }
}

@media (max-width: 1100px) {
  .powerdoc-editor-topbar { min-height: 58px; padding: 10px 16px; }
  .powerdoc-back-button, .powerdoc-read-button, .powerdoc-delete-button { min-height: 38px; font-size: 12px; }
  .powerdoc-title-input { padding: 24px 22px 11px; font-size: 24px; }
  .powerdoc-editor-toolbar {
    padding: 9px 16px; gap: 7px; align-items: center;
  }
  .powerdoc-editor-toolbar button { width: 40px; height: 40px; font-size: 14px; }
  .doc-text-color { width: 40px; height: 40px; font-size: 14px; }
  .powerdoc-editor-toolbar button[data-doc-command^="heading"] { width: 38px; font-size: 12px; }
  .powerdoc-editor-toolbar .ink-tool { width: auto; min-width: 72px; padding-inline: 11px; font-size: 12px; }
  .powerdoc-editor-toolbar .ink-color { width: 26px; height: 26px; }
  .ink-size-control { min-height: 40px; padding-inline: 9px 6px; font-size: 11px; }
  .toolbar-sep { margin-inline: 4px; }
  .powerdoc-content-editor { padding: 22px 24px 64px; font-size: 15.5px; }
}

@media (max-width: 620px) {
  .powerdoc-editor-topbar { min-height: 56px; padding: 8px 10px; gap: 8px; }
  .powerdoc-editor-actions { gap: 6px; }
  .powerdoc-back-button { max-width: 118px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .powerdoc-read-button, .powerdoc-delete-button { min-height: 38px; padding-inline: 10px; font-size: 12px; }
  .powerdoc-title-input { padding: 20px 16px 10px; font-size: 22px; }
  .powerdoc-editor-toolbar {
    justify-content: flex-start; flex-wrap: nowrap; gap: 8px; padding: 9px 12px;
    overflow-x: auto; overscroll-behavior-x: contain; scrollbar-width: thin;
  }
  .powerdoc-editor-toolbar > * { flex: 0 0 auto; }
  .powerdoc-editor-toolbar button { width: 42px; height: 42px; }
  .doc-text-color { width: 42px; height: 42px; font-size: 15px; }
  .powerdoc-editor-toolbar button[data-doc-command^="heading"] { width: 40px; }
  .powerdoc-editor-toolbar .ink-tool { width: auto; min-width: 76px; height: 42px; font-size: 12px; }
  .powerdoc-editor-toolbar .ink-color { width: 28px; height: 28px; }
  .ink-size-control { min-height: 42px; font-size: 12px; }
  .powerdoc-content-editor { padding: 20px 17px 72px; font-size: 16px; line-height: 1.85; }
  .powerdoc-editor.reading .powerdoc-title-input { padding-top: 34px; }
  .powerdoc-editor.reading .powerdoc-content-editor { padding-inline: 20px; font-size: 16px; }
}

@media (max-width: 480px) {
  .course-title { margin-left: 6px !important; }
  .course-title .subject-icon { display: none; }
  .mode-switcher { display: none; }
  .mode-btn { width: 29px; }
  .welcome-copy { font-size: 13px; }
  .message-avatar { width: 31px; height: 31px; }
  .message { gap: 9px; }
  .composer { border-radius: 15px; }
  .auth-visual { min-height: 126px; grid-template-columns: 82px 1fr; }
  .auth-logo { width: 82px; max-height: 82px; }
  .auth-content { padding: 24px 20px 22px; }
}

/* ── Appearance, collapsible navigation & ink tools ─── */
.app-shell {
  transition: grid-template-columns .22s ease;
}
.menu-button {
  display: grid;
  flex: 0 0 38px;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
}
.sidebar-close {
  display: grid;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  place-items: center;
  border-radius: 10px;
}
.sidebar-close:hover,
.menu-button:hover { background: var(--mint); }
.app-shell.sidebar-collapsed { grid-template-columns: 0 minmax(0, 1fr); }
.app-shell.sidebar-collapsed .sidebar {
  min-width: 0;
  padding-inline: 0;
  border-right-width: 0;
  overflow: hidden;
  visibility: hidden;
  pointer-events: none;
}
:root[data-color-mode="dark"] {
  --paper: #111815;
  --panel: #17211d;
  --line: #314039;
  --ink: #e6eee9;
  --muted: #9eada5;
  --white: #18221e;
  --mint: #263f35;
  --shadow: 0 24px 70px rgba(0, 0, 0, .38);
  --soft-shadow: 0 10px 32px rgba(0, 0, 0, .24);
}
:root[data-color-mode="dark"][data-theme="forest"] {
  --paper: #111815; --panel: #17211d; --line: #314039; --mint: #263f35; --white: #18221e; --ink: #f1f3f5; --muted: #aeb3b9;
}
:root[data-color-mode="dark"][data-theme="ocean"] {
  --paper: #11171c; --panel: #17212a; --line: #30414e; --mint: #263946; --white: #1b2730; --ink: #f1f3f5; --muted: #aeb3b9;
}
:root[data-color-mode="dark"][data-theme="violet"] {
  --paper: #17141b; --panel: #211b28; --line: #42374e; --mint: #392f45; --white: #282130; --ink: #f1f3f5; --muted: #aeb3b9;
}
:root[data-color-mode="dark"][data-theme="sunset"] {
  --paper: #1b1513; --panel: #271d1a; --line: #4d3933; --mint: #44312b; --white: #2d211d; --ink: #f1f3f5; --muted: #aeb3b9;
}
:root[data-color-mode="dark"] body {
  background:
    radial-gradient(circle at 72% -10%, color-mix(in srgb, var(--green) 16%, transparent), transparent 34%),
    var(--paper);
}
:root[data-color-mode="dark"] .sidebar {
  border-right-color: var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,.025), transparent 26%), var(--panel);
}
:root[data-color-mode="dark"] .topbar,
:root[data-color-mode="dark"] .powerdoc-editor-topbar,
:root[data-color-mode="dark"] .powerdoc-editor-toolbar {
  border-color: var(--line);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
}
:root[data-color-mode="dark"] .subject-button,
:root[data-color-mode="dark"] .powerdoc-sidebar-entry { color: #b9c7c0; }
:root[data-color-mode="dark"] .subject-button:hover,
:root[data-color-mode="dark"] .subject-button.active,
:root[data-color-mode="dark"] .conversation-item:hover,
:root[data-color-mode="dark"] .conversation-item.active,
:root[data-color-mode="dark"] .powerdoc-sidebar-entry:hover,
:root[data-color-mode="dark"] .powerdoc-sidebar-entry.active,
:root[data-color-mode="dark"] .profile-button:hover {
  color: var(--ink);
  background: rgba(255,255,255,.07);
  box-shadow: none;
}
:root[data-color-mode="dark"] .subject-emoji,
:root[data-color-mode="dark"] .powerdoc-nav-icon,
:root[data-color-mode="dark"] .conversation-search,
:root[data-color-mode="dark"] .mode-switcher {
  color: var(--ink);
  background: rgba(255,255,255,.06);
}
:root[data-color-mode="dark"] input,
:root[data-color-mode="dark"] textarea,
:root[data-color-mode="dark"] select,
:root[data-color-mode="dark"] .composer,
:root[data-color-mode="dark"] .modal,
:root[data-color-mode="dark"] .security-card,
:root[data-color-mode="dark"] .auth-content,
:root[data-color-mode="dark"] .powerdoc-card,
:root[data-color-mode="dark"] .quiz-card,
:root[data-color-mode="dark"] .mindmap-card,
:root[data-color-mode="dark"] .message.assistant .message-body {
  color: var(--ink);
  border-color: var(--line);
  background: #18221e;
}
:root[data-color-mode="dark"] .composer-wrap {
  background: linear-gradient(180deg, transparent, var(--paper) 28%);
}
:root[data-color-mode="dark"] .export-chat-button,
:root[data-color-mode="dark"] .suggestion,
:root[data-color-mode="dark"] .quiz-options button,
:root[data-color-mode="dark"] .mindmap-children span {
  color: var(--ink);
  border-color: var(--line);
  background: #1c2823;
}
:root[data-color-mode="dark"] .export-chat-button:hover,
:root[data-color-mode="dark"] .suggestion:hover,
:root[data-color-mode="dark"] .quiz-options button:hover:not(:disabled) {
  background: #24332c;
}
:root[data-color-mode="dark"] .markdown-code,
:root[data-color-mode="dark"] pre,
:root[data-color-mode="dark"] code {
  color: #d9e5df;
  background: #0c1210;
}
:root[data-color-mode="dark"] .visual-card,
:root[data-color-mode="dark"] .visual-stage,
:root[data-color-mode="dark"] .jsxgraph-card,
:root[data-color-mode="dark"] .katex-display {
  border-color: var(--line);
  background-color: #17211d;
}
:root[data-color-mode="dark"] .powerdoc-content-editor {
  color: var(--ink);
}
:root[data-color-mode="dark"] .message-text,
:root[data-color-mode="dark"] .message-text strong,
:root[data-color-mode="dark"] .message-text em,
:root[data-color-mode="dark"] .rich-math,
:root[data-color-mode="dark"] .powerdoc-content-editor strong,
:root[data-color-mode="dark"] .powerdoc-content-editor em,
:root[data-color-mode="dark"] .welcome-copy,
:root[data-color-mode="dark"] .input-meta,
:root[data-color-mode="dark"] .attachment-button,
:root[data-color-mode="dark"] .attachment-chip,
:root[data-color-mode="dark"] .preferences label,
:root[data-color-mode="dark"] .bilingual-copy small {
  color: #c8d4ce;
}
:root[data-color-mode="dark"] .rich-table,
:root[data-color-mode="dark"] .markdown-table,
:root[data-color-mode="dark"] .powerdoc-content-editor table,
:root[data-color-mode="dark"] .attachment-button,
:root[data-color-mode="dark"] .attachment-chip,
:root[data-color-mode="dark"] .bilingual-setting {
  border-color: var(--line);
  background: #1a2520;
}
:root[data-color-mode="dark"] .rich-table-wrap th,
:root[data-color-mode="dark"] .markdown-table-row.header,
:root[data-color-mode="dark"] .powerdoc-content-editor th,
:root[data-color-mode="dark"] .mode-btn.active,
:root[data-color-mode="dark"] .privacy-pill {
  color: var(--ink);
  background: #26372f;
}
:root[data-color-mode="dark"] .thinktree-card,
:root[data-color-mode="dark"] .analogy-card,
:root[data-color-mode="dark"] .concept-cloud {
  color: var(--ink);
  border-color: var(--line);
  background: #19241f;
}
:root[data-color-mode="dark"] .powerdoc-ink-canvas {
  filter: invert(1) hue-rotate(180deg);
}
:root[data-color-mode="dark"] .modal-backdrop {
  background: rgba(0, 0, 0, .68);
}
:root[data-color-mode="dark"] .chat-view,
:root[data-color-mode="dark"] .powerdoc-manager,
:root[data-color-mode="dark"] .powerdoc-editor,
:root[data-color-mode="dark"] .powerdoc-editor-body {
  background-color: var(--paper);
}
:root[data-color-mode="dark"] .message.user .message-body,
:root[data-color-mode="dark"] .message.user .message-avatar {
  color: var(--ink);
  background: #26312c;
}
:root[data-color-mode="dark"] .message-text blockquote,
:root[data-color-mode="dark"] .markdown-quote,
:root[data-color-mode="dark"] .powerdoc-content-editor blockquote,
:root[data-color-mode="dark"] .rich-math-block,
:root[data-color-mode="dark"] .powerdoc-content-editor .doc-math,
:root[data-color-mode="dark"] .powerdoc-content-editor .doc-math-block {
  color: #cbd8d1;
  border-color: var(--green-2);
  background: rgba(76, 125, 104, .16);
}
:root[data-color-mode="dark"] .rendered-math,
:root[data-color-mode="dark"] .katex,
:root[data-color-mode="dark"] .katex-display {
  color: #e6eee9;
}
:root[data-color-mode="dark"] .rich-table-wrap,
:root[data-color-mode="dark"] .markdown-table,
:root[data-color-mode="dark"] .rich-table-wrap th,
:root[data-color-mode="dark"] .rich-table-wrap td,
:root[data-color-mode="dark"] .markdown-table-row,
:root[data-color-mode="dark"] .markdown-table-cell,
:root[data-color-mode="dark"] .powerdoc-content-editor .doc-table th,
:root[data-color-mode="dark"] .powerdoc-content-editor .doc-table td {
  color: var(--ink);
  border-color: #394a42;
  background: #19241f;
}
:root[data-color-mode="dark"] .rich-table-wrap th,
:root[data-color-mode="dark"] .markdown-table-row.header,
:root[data-color-mode="dark"] .powerdoc-content-editor .doc-table th {
  background: #26372f;
}
:root[data-color-mode="dark"] .teaching-visual,
:root[data-color-mode="dark"] .teaching-board,
:root[data-color-mode="dark"] .message-attachment,
:root[data-color-mode="dark"] .pending-attachment,
:root[data-color-mode="dark"] .quick-action-btn,
:root[data-color-mode="dark"] .insert-doc-item,
:root[data-color-mode="dark"] .powerdoc-manager-header {
  color: var(--ink);
  border-color: var(--line);
  background: #18231e;
}
:root[data-color-mode="dark"] .teaching-board .JXGtext,
:root[data-color-mode="dark"] .visual-legend {
  color: #c7d5ce !important;
}
:root[data-color-mode="dark"] .visual-grid { stroke: #34443d; }
:root[data-color-mode="dark"] .visual-grid.axis { stroke: #53655d; }
:root[data-color-mode="dark"] .visual-axis { stroke: #84968e; }
:root[data-color-mode="dark"] .visual-axis-label { fill: #aebdb5; }
:root[data-color-mode="dark"] .visual-point-label,
:root[data-color-mode="dark"] .visual-side-label { fill: #e6eee9; }
:root[data-color-mode="dark"] .powerdoc-editor-toolbar button:hover,
:root[data-color-mode="dark"] .powerdoc-editor-toolbar button.active,
:root[data-color-mode="dark"] .message-action-btn:hover,
:root[data-color-mode="dark"] .quick-action-btn:hover,
:root[data-color-mode="dark"] .insert-doc-item:hover {
  color: #dce9e2;
  background: #294137;
}
:root[data-color-mode="dark"] .ink-size-control,
:root[data-color-mode="dark"] .ink-size-control select {
  color: var(--ink);
  border-color: var(--line);
  background: #1b2722;
}
:root[data-color-mode="dark"] .powerdoc-read-button,
:root[data-color-mode="dark"] .secondary-button {
  color: #bcd1c7;
  border-color: #42564d;
  background: #1d2a24;
}
:root[data-color-mode="dark"] .powerdoc-delete-button,
:root[data-color-mode="dark"] .danger-button {
  color: #efa9a2;
  border-color: #70453f;
  background: #30201e;
}
:root[data-color-mode="dark"] .quiz-progress,
:root[data-color-mode="dark"] .quiz-feedback {
  color: #cbd8d1;
  background: #26372f;
}
:root[data-color-mode="dark"] .quiz-options button.correct {
  border-color: #4e8c6d;
  background: #183326;
}
:root[data-color-mode="dark"] .quiz-options button.wrong {
  border-color: #91554e;
  background: #38201e;
}
:root[data-color-mode="dark"] .mindmap-branch {
  background: color-mix(in srgb, var(--branch) 18%, #17211d);
}
:root[data-color-mode="dark"] .thinktree-card-inner strong,
:root[data-color-mode="dark"] .analogy-card-inner,
:root[data-color-mode="dark"] .thinktree-card.recommended .thinktree-card-inner strong {
  color: #d2ded8;
}
:root[data-color-mode="dark"] .visual-error,
:root[data-color-mode="dark"] .rich-math-error {
  color: #f0c38f;
  background: #34291d;
}
:root[data-color-mode="dark"] .remove-attachment,
:root[data-color-mode="dark"] .archive-chat:hover {
  color: var(--ink);
  background: #2b3933;
}
:root[data-color-mode="dark"] .delete-chat:hover {
  background: #3b2421;
}
:root[data-color-mode="dark"] .powerdoc-header-button,
:root[data-color-mode="dark"] .powerdoc-batch-bar {
  color: #d2ddd7;
  border-color: #405149;
  background: #1b2722;
}
:root[data-color-mode="dark"] .powerdoc-header-button:hover,
:root[data-color-mode="dark"] .powerdoc-header-button.active,
:root[data-color-mode="dark"] .powerdoc-batch-bar button:hover {
  background: #294137;
}
:root[data-color-mode="dark"] .powerdoc-card.selected {
  border-color: var(--green-2);
  background: #23362e;
}

/* Settings modal: keep every nested control on the same dark surface. */
:root[data-color-mode="dark"] .security-card {
  color: var(--ink);
  border-color: #34443d;
  background: #151e1a;
}
:root[data-color-mode="dark"] .security-card .preferences {
  border-color: #34443d;
  background: #111815;
}
:root[data-color-mode="dark"] .security-card .preferences > label:not(.bilingual-setting),
:root[data-color-mode="dark"] .security-card .preferences > fieldset {
  color: var(--ink);
}
:root[data-color-mode="dark"] .security-card .preferences label > span,
:root[data-color-mode="dark"] .security-card .preferences legend,
:root[data-color-mode="dark"] .security-card .eyebrow,
:root[data-color-mode="dark"] .security-card .modal-close {
  color: #aebdb5;
}
:root[data-color-mode="dark"] .security-card .preferences select,
:root[data-color-mode="dark"] .security-card .preferences select option {
  color: #e6eee9;
  border-color: #405149;
  background: #1b2722;
}
:root[data-color-mode="dark"] .security-card .bilingual-setting {
  color: var(--ink);
  border-color: #34473e;
  background: #1a2520;
}
:root[data-color-mode="dark"] .security-card .bilingual-setting:hover {
  border-color: #4e685c;
  background: #1e2c26;
}
:root[data-color-mode="dark"] .security-card .switch-track {
  background: #46534d;
}
:root[data-color-mode="dark"] .security-card .switch-track::after {
  background: #dce7e1;
  box-shadow: 0 2px 7px rgba(0,0,0,.45);
}
:root[data-color-mode="dark"] .security-card .bilingual-setting input:checked + .switch-track {
  background: var(--green-2);
}
:root[data-color-mode="dark"] .security-card .theme-options button {
  border-color: #151e1a;
  box-shadow: 0 0 0 1px #58675f;
}
:root[data-color-mode="dark"] .security-card .theme-options button.active {
  box-shadow: 0 0 0 2px var(--swatch), 0 0 0 4px #151e1a;
}
:root[data-color-mode="dark"] .security-card .security-actions {
  border-top-color: #34443d;
}
:root[data-color-mode="dark"] .security-card .secondary-button,
:root[data-color-mode="dark"] .security-card .file-label {
  color: #d2ddd7;
  border-color: #405149;
  background: #1b2722;
}
:root[data-color-mode="dark"] .security-card .secondary-button:hover,
:root[data-color-mode="dark"] .security-card .file-label:hover {
  border-color: #597165;
  background: #23322b;
}

/* Both speakers use the same bubble language; alignment and corner direction
   are the only visual distinction. */
.message.assistant .message-body,
.message.user .message-body {
  padding: 10px 14px;
  border: 1px solid rgba(58, 90, 77, .10);
  background: #edf1ee;
}
.message.assistant .message-body {
  flex: 0 1 auto;
  width: fit-content;
  max-width: min(650px, calc(100% - 46px));
  border-radius: 5px 15px 15px 15px;
}
.message.user .message-body { border-radius: 15px 5px 15px 15px; }
:root[data-color-mode="dark"] .message.assistant .message-body,
:root[data-color-mode="dark"] .message.user .message-body {
  color: var(--ink);
  border-color: #37473f;
  background: #26312c;
}

/* Socratic mode deliberately shares the exact page background used by the
   standard and ThinkTree modes. */
.main[data-mode-active="socratic"] { background: transparent; }
.main[data-mode-active="socratic"] .chat-view { background: transparent; }
.main[data-mode-active="socratic"] .composer-wrap {
  background: linear-gradient(180deg, transparent, var(--paper) 28%);
}
:root[data-color-mode="dark"] .main[data-mode-active="socratic"] { background: transparent; }
:root[data-color-mode="dark"] .main[data-mode-active="socratic"] .chat-view {
  background: var(--paper);
}
:root[data-color-mode="dark"] .main[data-mode-active="socratic"] .composer-wrap {
  background: linear-gradient(180deg, transparent, var(--paper) 28%);
}

/* Theme consistency: replace legacy forest-only tints in shared UI surfaces. */
.sidebar,
.topbar,
.powerdoc-manager-header,
.powerdoc-editor-topbar,
.powerdoc-editor-toolbar,
.composer,
.suggestion,
.powerdoc-card,
.quiz-card,
.mindmap-card,
.teaching-visual {
  border-color: color-mix(in srgb, var(--green) 13%, var(--line));
}
.conversation-search:focus,
.composer:focus-within,
.suggestion:hover,
.powerdoc-card:hover {
  border-color: color-mix(in srgb, var(--green) 42%, var(--line));
}
.subject-conversations,
.sidebar-footer,
.powerdoc-nav,
.concept-cloud {
  border-color: color-mix(in srgb, var(--green) 18%, transparent);
}
.subject-icon,
.subject-emoji,
.powerdoc-nav-icon,
.mode-btn.active,
.privacy-pill,
.concept-tag,
.quiz-options button b {
  background: var(--mint);
}
.message-text strong,
.rich-math,
.rendered-math,
.powerdoc-content-editor strong {
  color: color-mix(in srgb, var(--green) 55%, var(--ink));
}
.message-text em,
.powerdoc-content-editor em,
.visual-legend,
.teaching-board .JXGtext {
  color: color-mix(in srgb, var(--green) 24%, var(--ink)) !important;
}
.message-text blockquote,
.markdown-quote,
.powerdoc-content-editor blockquote,
.rich-math-block,
.powerdoc-content-editor .doc-math,
.powerdoc-content-editor .doc-math-block {
  border-color: var(--green-2);
  background: color-mix(in srgb, var(--green) 10%, var(--paper));
}
.thinktree-card { background: color-mix(in srgb, var(--green) 6%, var(--paper)); }
.analogy-card { background: color-mix(in srgb, var(--green) 5%, var(--paper)); }
.message.assistant .message-body,
.message.user .message-body {
  border-color: color-mix(in srgb, var(--green) 10%, var(--line));
  background: color-mix(in srgb, var(--green) 5%, var(--paper));
}
:root[data-color-mode="dark"] .message.assistant .message-body,
:root[data-color-mode="dark"] .message.user .message-body,
:root[data-color-mode="dark"] .modal,
:root[data-color-mode="dark"] .security-card,
:root[data-color-mode="dark"] .composer,
:root[data-color-mode="dark"] .powerdoc-card {
  border-color: color-mix(in srgb, var(--green) 25%, var(--line));
  background: color-mix(in srgb, var(--green) 8%, var(--panel));
}
:root[data-color-mode="dark"] .security-card .preferences,
:root[data-color-mode="dark"] .security-card .bilingual-setting,
:root[data-color-mode="dark"] .security-card .preferences select,
:root[data-color-mode="dark"] .security-card .secondary-button {
  border-color: color-mix(in srgb, var(--green) 24%, var(--line));
  background: color-mix(in srgb, var(--green) 6%, var(--panel));
}

/* Empty chat and PowerDoc home must use the complete active theme palette. */
.chat-view,
.welcome,
.powerdoc-manager {
  color: var(--ink);
  background: var(--paper);
}
.welcome h1,
.powerdoc-manager-header h2,
.powerdoc-card h3 {
  color: var(--ink);
}
.welcome-copy,
.powerdoc-manager .empty-history,
.powerdoc-card p,
.powerdoc-card time,
.powerdoc-batch-bar > span {
  color: var(--muted);
}
.suggestion {
  color: var(--ink);
  border-color: color-mix(in srgb, var(--green) 14%, var(--line));
  background: color-mix(in srgb, var(--green) 4%, var(--white));
  box-shadow: 0 8px 28px color-mix(in srgb, var(--green) 7%, transparent);
}
.suggestion:hover {
  color: var(--ink);
  border-color: color-mix(in srgb, var(--green) 38%, var(--line));
  background: color-mix(in srgb, var(--green) 8%, var(--white));
  box-shadow: 0 16px 38px color-mix(in srgb, var(--green) 12%, transparent);
}
.suggestion span { color: var(--green-2); }
.powerdoc-manager-header {
  border-color: color-mix(in srgb, var(--green) 15%, var(--line));
  background: color-mix(in srgb, var(--paper) 94%, transparent);
}
.powerdoc-header-button,
.powerdoc-batch-bar,
.powerdoc-card {
  color: var(--ink);
  border-color: color-mix(in srgb, var(--green) 15%, var(--line));
  background: color-mix(in srgb, var(--green) 4%, var(--white));
}
.powerdoc-header-button {
  color: var(--green);
}
.powerdoc-header-button:hover,
.powerdoc-header-button.active,
.powerdoc-batch-bar button:hover {
  color: var(--green);
  border-color: color-mix(in srgb, var(--green) 38%, var(--line));
  background: var(--mint);
}
.powerdoc-batch-bar button {
  color: var(--green);
  border-color: color-mix(in srgb, var(--green) 18%, var(--line));
}
.powerdoc-card:hover,
.powerdoc-card.selected {
  border-color: var(--green-2);
  background: color-mix(in srgb, var(--green) 10%, var(--white));
  box-shadow: 0 12px 30px color-mix(in srgb, var(--green) 13%, transparent);
}

/* Explicit page palettes. These selectors intentionally outrank legacy
   component rules so changing a theme is unmistakable on both home screens. */
:root[data-theme="forest"] {
  --theme-page: #f4f8f5; --theme-card: #fbfdfb; --theme-hover: #e7f0eb; --theme-border: #ccddd4;
}
:root[data-theme="ocean"] {
  --theme-page: #f1f7fb; --theme-card: #f9fcfe; --theme-hover: #e1edf5; --theme-border: #c7dce8;
}
:root[data-theme="violet"] {
  --theme-page: #f7f2fa; --theme-card: #fcf9fe; --theme-hover: #ebe2f2; --theme-border: #dccbe8;
}
:root[data-theme="sunset"] {
  --theme-page: #fbf3ef; --theme-card: #fffaf8; --theme-hover: #f4e1d9; --theme-border: #e9cdc1;
}
:root[data-color-mode="dark"][data-theme="forest"] {
  --theme-page: #111815; --theme-card: #19231f; --theme-hover: #243a31; --theme-border: #355044;
}
:root[data-color-mode="dark"][data-theme="ocean"] {
  --theme-page: #101820; --theme-card: #192631; --theme-hover: #243b4b; --theme-border: #36566a;
}
:root[data-color-mode="dark"][data-theme="violet"] {
  --theme-page: #17131c; --theme-card: #241d2c; --theme-hover: #3a2d48; --theme-border: #574268;
}
:root[data-color-mode="dark"][data-theme="sunset"] {
  --theme-page: #1c1411; --theme-card: #2a1e1a; --theme-hover: #452f27; --theme-border: #66473c;
}
:root[data-theme] .chat-view,
:root[data-theme] .welcome,
:root[data-theme] .powerdoc-manager {
  background: var(--theme-page);
}
:root[data-theme] .suggestion,
:root[data-theme] .powerdoc-manager-header,
:root[data-theme] .powerdoc-header-button,
:root[data-theme] .powerdoc-batch-bar,
:root[data-theme] .powerdoc-card {
  border-color: var(--theme-border);
  background: var(--theme-card);
}
:root[data-theme] .suggestion:hover,
:root[data-theme] .powerdoc-header-button:hover,
:root[data-theme] .powerdoc-header-button.active,
:root[data-theme] .powerdoc-batch-bar button:hover,
:root[data-theme] .powerdoc-card:hover,
:root[data-theme] .powerdoc-card.selected {
  border-color: var(--green-2);
  background: var(--theme-hover);
}
:root[data-theme] .powerdoc-manager-header {
  background: color-mix(in srgb, var(--theme-page) 94%, transparent);
}

/* Remaining theme-bound controls called out in the main chat and editor. */
:root[data-theme] .composer {
  color: var(--ink);
  border-color: var(--theme-border);
  background: var(--theme-card);
  box-shadow: 0 16px 48px color-mix(in srgb, var(--green) 12%, transparent);
}
:root[data-theme] .composer:focus-within {
  border-color: var(--green-2);
  box-shadow:
    0 18px 52px color-mix(in srgb, var(--green) 14%, transparent),
    0 0 0 3px color-mix(in srgb, var(--green) 9%, transparent);
}
:root[data-theme] .composer textarea {
  color: var(--ink);
  background: transparent;
}
:root[data-theme] .attachment-button,
:root[data-theme] .quick-action-btn,
:root[data-theme] .pending-attachment {
  color: var(--ink);
  border-color: var(--theme-border);
  background: color-mix(in srgb, var(--green) 4%, var(--theme-card));
}
:root[data-theme] .attachment-button:hover,
:root[data-theme] .quick-action-btn:hover {
  color: var(--green);
  border-color: var(--green-2);
  background: var(--theme-hover);
}
:root[data-theme] .mode-switcher {
  border-color: var(--theme-border);
  background: color-mix(in srgb, var(--green) 5%, var(--theme-card));
}
:root[data-theme] .mode-btn {
  color: var(--muted);
  background: transparent;
}
:root[data-theme] .mode-btn:hover {
  color: var(--green);
  background: var(--theme-hover);
}
:root[data-theme] .mode-btn.active {
  color: var(--green);
  background: var(--mint);
  box-shadow: 0 2px 8px color-mix(in srgb, var(--green) 14%, transparent);
}
:root[data-theme] .privacy-pill {
  color: var(--green);
  border-color: var(--theme-border);
  background: var(--theme-hover);
}
:root[data-theme] .export-chat-button {
  color: var(--green);
  border-color: var(--theme-border);
  background: var(--theme-card);
}
:root[data-theme] .export-chat-button:hover {
  color: var(--green);
  border-color: var(--green-2);
  background: var(--theme-hover);
}
:root[data-theme] .powerdoc-editor,
:root[data-theme] .powerdoc-editor-body,
:root[data-theme] .powerdoc-content-editor {
  color: var(--ink);
  background: var(--theme-page);
}
:root[data-theme] .powerdoc-editor-topbar,
:root[data-theme] .powerdoc-editor-toolbar {
  color: var(--ink);
  border-color: var(--theme-border);
  background: color-mix(in srgb, var(--theme-card) 94%, transparent);
}
:root[data-theme] .powerdoc-title-input {
  color: var(--ink);
  border-color: var(--theme-border);
  background: var(--theme-page);
}
:root[data-theme] .powerdoc-editor-toolbar button,
:root[data-theme] .doc-text-color {
  color: var(--muted);
  background: transparent;
}
:root[data-theme] .powerdoc-editor-toolbar button:hover,
:root[data-theme] .powerdoc-editor-toolbar button.active,
:root[data-theme] .doc-text-color:hover {
  color: var(--green);
  background: var(--theme-hover);
}
:root[data-theme] .powerdoc-editor-toolbar button.ink-color,
:root[data-theme] .powerdoc-editor-toolbar button.ink-color:hover,
:root[data-theme] .powerdoc-editor-toolbar button.ink-color.active {
  color: transparent;
  border: 2px solid var(--theme-card);
  background: var(--ink-color);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--ink) 22%, transparent);
}
:root[data-theme] .powerdoc-editor-toolbar button.ink-color.active {
  box-shadow: 0 0 0 2px var(--theme-card), 0 0 0 4px var(--ink);
}
:root[data-theme] .ink-size-control,
:root[data-theme] .ink-size-control select,
:root[data-theme] .powerdoc-read-button {
  color: var(--ink);
  border-color: var(--theme-border);
  background: var(--theme-card);
}
:root[data-theme] .powerdoc-read-button:hover,
:root[data-theme] .powerdoc-read-button[aria-pressed="true"] {
  color: #fff;
  border-color: var(--green);
  background: var(--green);
}
:root[data-theme] .powerdoc-content-editor blockquote,
:root[data-theme] .powerdoc-content-editor .doc-math,
:root[data-theme] .powerdoc-content-editor .doc-math-block {
  color: var(--ink);
  border-color: var(--green-2);
  background: color-mix(in srgb, var(--green) 9%, var(--theme-card));
}
:root[data-theme] .powerdoc-content-editor .doc-table th,
:root[data-theme] .powerdoc-content-editor .doc-table td {
  color: var(--ink);
  border-color: var(--theme-border);
  background: var(--theme-card);
}
:root[data-theme] .powerdoc-content-editor .doc-table th {
  background: var(--theme-hover);
}

/* Text stays neutral for reliable contrast; theme colors are decorative only. */
:root[data-theme] .subject-button.active,
:root[data-theme] .subject-new-chat,
:root[data-theme] .text-button,
:root[data-theme] .text-button:hover,
:root[data-theme] .text-button.active,
:root[data-theme] .suggestion span,
:root[data-theme] .markdown-link,
:root[data-theme] .markdown-link:hover,
:root[data-theme] .teaching-visual figcaption span,
:root[data-theme] .message-ocr-status,
:root[data-theme] .attachment-button:hover,
:root[data-theme] .ocr-status.working,
:root[data-theme] .logout-button,
:root[data-theme] .quick-action-btn,
:root[data-theme] .quick-action-btn:hover,
:root[data-theme] .thinktree-card-inner strong,
:root[data-theme] .powerdoc-header-button,
:root[data-theme] .powerdoc-header-button:hover,
:root[data-theme] .powerdoc-batch-bar button,
:root[data-theme] .powerdoc-back-button,
:root[data-theme] .powerdoc-read-button,
:root[data-theme] .powerdoc-save-status.saved,
:root[data-theme] .doc-text-color:hover,
:root[data-theme] .insert-doc-item:hover,
:root[data-theme] .powerdoc-content-editor a,
:root[data-theme] .message-action-btn:hover,
:root[data-theme] .message-action-btn.done,
:root[data-theme] .privacy-pill,
:root[data-theme] .export-chat-button,
:root[data-theme] .export-chat-button:hover,
:root[data-theme] .message-text strong,
:root[data-theme] .message-text em,
:root[data-theme] .rich-math,
:root[data-theme] .rendered-math,
:root[data-theme] .powerdoc-content-editor strong,
:root[data-theme] .powerdoc-content-editor em,
:root[data-theme] .visual-legend,
:root[data-theme] .teaching-board .JXGtext {
  color: var(--ink);
}
:root[data-theme] .message-text li::marker,
:root[data-theme] .markdown-list-marker {
  color: var(--ink);
}
:root[data-theme] .visual-formula-label,
:root[data-theme] .visual-vector-label,
:root[data-theme] .visual-side-label,
:root[data-theme] .visual-point-label {
  fill: var(--ink);
}
:root[data-theme] .powerdoc-read-button:hover,
:root[data-theme] .powerdoc-read-button[aria-pressed="true"] {
  color: #fff;
}

@media (min-width: 781px) {
  .topbar { padding-left: 14px; justify-content: flex-start; gap: 12px; }
  .topbar .top-actions { margin-left: auto; }
}
@media (max-width: 780px) {
  .selection-quote-button { min-width: 66px; min-height: 44px; padding-inline: 14px; font-size: 13px; }
}

@media (max-width: 1100px) and (orientation: portrait), (max-width: 780px) {
  .app-shell,
  .app-shell.sidebar-collapsed { grid-template-columns: minmax(0, 1fr); }
  .app-shell.sidebar-collapsed .sidebar {
    width: min(295px, 88vw);
    padding: 22px 16px 16px;
    border-right-width: 1px;
    visibility: visible;
    pointer-events: auto;
  }
}

@media (max-width: 700px) {
  .powerdoc-manager-header { align-items: flex-start; gap: 12px; }
  .powerdoc-manager-actions { max-width: 72%; flex-wrap: wrap; gap: 6px; }
  .powerdoc-header-button, .powerdoc-new-button { min-height: 40px; }
  .powerdoc-batch-bar { top: 82px; }
  .powerdoc-editor-actions { flex-wrap: wrap; justify-content: flex-end; gap: 6px; }
  .powerdoc-save-status { width: 100%; order: 2; }
}

@media print {
  @page { margin: 16mm; }
  body.printing-powerdoc {
    width: auto; height: auto; overflow: visible; color: #111; background: #fff;
  }
  body.printing-powerdoc .app-shell {
    display: block; width: auto; height: auto; overflow: visible;
  }
  body.printing-powerdoc .sidebar,
  body.printing-powerdoc .sidebar-scrim,
  body.printing-powerdoc .topbar,
  body.printing-powerdoc .powerdoc-editor-topbar,
  body.printing-powerdoc .composer-wrap,
  body.printing-powerdoc .powerdoc-manager {
    display: none !important;
  }
  body.printing-powerdoc .main,
  body.printing-powerdoc .powerdoc-editor,
  body.printing-powerdoc .powerdoc-editor-body {
    display: block !important; width: auto; height: auto; overflow: visible; background: #fff;
  }
  body.printing-powerdoc .powerdoc-title-input {
    width: 100%; padding: 0 0 10mm; color: #111; border: 0;
    font-size: 25pt; background: transparent;
  }
  body.printing-powerdoc .powerdoc-content-editor {
    display: block; width: 100%; min-height: 0; padding: 0; overflow: visible;
    color: #111; font-size: 11.5pt; line-height: 1.7;
  }
  body.printing-powerdoc .powerdoc-editor-toolbar {
    visibility: hidden; box-shadow: none; border: 0; background: transparent;
  }
  body.printing-powerdoc .powerdoc-ink-canvas {
    pointer-events: none; filter: none !important;
  }
}