:root {
  --bg: #f6f2ec;
  --surface: #fffdf9;
  --surface-2: #efe8de;
  --ink: #2b2724;
  --ink-2: #6b625a;
  --line: #e2d9cc;
  --accent: #3f7169;
  --accent-hover: #345e57;
  --accent-ink: #ffffff;
  --accent-soft: #e2edea;
  --warm-soft: #fbeee3;
  --warm-line: #e6b98f;
  --danger: #a8443a;
  --danger-soft: #f8e5e1;
  --shadow: 0 1px 2px rgb(60 40 20 / 6%), 0 6px 20px rgb(60 40 20 / 6%);
  --radius: 14px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1c1a18;
    --surface: #252220;
    --surface-2: #2f2b28;
    --ink: #ece6de;
    --ink-2: #a89f95;
    --line: #3a3531;
    --accent: #7fb3a9;
    --accent-hover: #95c4bb;
    --accent-ink: #13201e;
    --accent-soft: #24332f;
    --warm-soft: #3a2d22;
    --warm-line: #8a6747;
    --danger: #e08a7e;
    --danger-soft: #3b2522;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 6px 20px rgb(0 0 0 / 25%);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #1c1a18;
  --surface: #252220;
  --surface-2: #2f2b28;
  --ink: #ece6de;
  --ink-2: #a89f95;
  --line: #3a3531;
  --accent: #7fb3a9;
  --accent-hover: #95c4bb;
  --accent-ink: #13201e;
  --accent-soft: #24332f;
  --warm-soft: #3a2d22;
  --warm-line: #8a6747;
  --danger: #e08a7e;
  --danger-soft: #3b2522;
  --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 6px 20px rgb(0 0 0 / 25%);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }

/* ---------- buttons ---------- */
.primary, .ghost, .danger-btn {
  border-radius: 10px;
  padding: 8px 16px;
  border: 1px solid transparent;
  transition: background .15s, border-color .15s;
}
.primary { background: var(--accent); color: var(--accent-ink); }
/* Hover styles apply only with a mouse, so they don't stick after a tap on phones. */
@media (hover: hover) { .primary:hover { background: var(--accent-hover); } }
.primary:disabled { opacity: .5; cursor: default; }
.ghost { background: transparent; border-color: var(--line); color: var(--ink-2); }
@media (hover: hover) { .ghost:hover { border-color: var(--ink-2); color: var(--ink); } }
.danger-btn { background: transparent; color: var(--danger); border-color: var(--line); }
@media (hover: hover) { .danger-btn:hover { background: var(--danger-soft); } }
.small { padding: 5px 12px; font-size: 13px; }
.linklike { background: none; border: 0; padding: 0; color: var(--accent); text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- layout ---------- */
.topbar { display: none; }
.app { display: flex; height: 100vh; height: 100dvh; }

.rail {
  width: 200px;
  flex: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 24px 14px;
  border-right: 1px solid var(--line);
}
.brand { padding: 0 10px 22px; display: flex; flex-direction: column; }
.brand-mark { font-size: 24px; font-weight: 600; letter-spacing: .12em; color: var(--accent); }
.brand-sub { font-size: 12px; color: var(--ink-2); letter-spacing: .08em; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  background: none; border: 0; border-radius: 10px;
  padding: 10px 12px; text-align: left; color: var(--ink-2);
}
.nav-item svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linejoin: round; stroke-linecap: round; flex: none; }
@media (hover: hover) { .nav-item:hover { background: var(--surface-2); color: var(--ink); } }
.nav-item.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.nav-chat { display: none; }
.rail-foot { margin-top: auto; display: flex; flex-direction: column; gap: 6px; padding: 0 10px; }
.help-link, .about-link { background: none; border: 0; padding: 4px 0; text-align: left; font-size: 13px; }
.help-link { color: var(--danger); }
.about-link { color: var(--ink-2); }
.lang-btn { align-self: flex-start; background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 3px 12px; font-size: 13px; color: var(--ink); }
@media (hover: hover) { .lang-btn:hover { border-color: var(--accent); color: var(--accent); } }
.rail-foot .lang-btn { margin-bottom: 8px; }
.topbar-actions { display: flex; align-items: center; gap: 8px; }
.dlg-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }

.main { flex: 1; min-width: 0; overflow-y: auto; container-type: inline-size; }
.view { display: none; padding: 32px clamp(16px, 4vw, 48px) 48px; max-width: 920px; margin: 0 auto; }
body[data-view="courses"] #view-courses,
body[data-view="library"] #view-library,
body[data-view="notes"] #view-notes { display: block; }

.view-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 8px; }
.view-head h1 { margin: 0; font-size: 24px; font-weight: 600; }
.hint { color: var(--ink-2); margin: 0 0 24px; font-size: 14px; }
.back { background: none; border: 0; padding: 4px 0; color: var(--accent); }

.empty {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  color: var(--ink-2);
  background: var(--surface);
}
.empty h2 { margin: 0 0 6px; font-size: 17px; color: var(--ink); font-weight: 600; }
.empty p { margin: 4px 0; }
.empty code { background: var(--surface-2); padding: 1px 6px; border-radius: 6px; font-size: 13px; }

/* ---------- courses ---------- */
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.course-card {
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 6px;
  transition: transform .15s, border-color .15s;
}
@media (hover: hover) { .course-card:hover { transform: translateY(-2px); border-color: var(--accent); } }
.course-card .num { font-size: 12px; color: var(--accent); font-weight: 600; letter-spacing: .06em; }
.course-card h2 { margin: 0; font-size: 17px; font-weight: 600; }
.course-card p { margin: 0; color: var(--ink-2); font-size: 14px; }

.reader { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(20px, 4vw, 44px); margin-top: 12px; }
.reader h1 { margin: 0 0 8px; font-size: 26px; }
.reader .lede { color: var(--ink-2); margin: 0 0 20px; }
.reader .prose { font-size: 17px; line-height: 1.85; }
.reader-tip { font-size: 13px; color: var(--ink-2); margin: 16px 0 0; }

/* ---------- prose ---------- */
.prose > :first-child { margin-top: 0; }
.prose > :last-child { margin-bottom: 0; }
.prose h1, .prose h2, .prose h3 { line-height: 1.4; margin: 1.4em 0 .5em; }
.prose h1 { font-size: 1.35em; }
.prose h2 { font-size: 1.2em; }
.prose h3 { font-size: 1.05em; }
.prose p { margin: .6em 0; }
.prose ul, .prose ol { padding-left: 1.4em; margin: .6em 0; }
.prose blockquote { margin: .8em 0; padding: .2em 1em; border-left: 3px solid var(--accent); color: var(--ink-2); background: var(--surface-2); border-radius: 0 8px 8px 0; }
.prose a { color: var(--accent); }
.prose code { background: var(--surface-2); padding: 1px 5px; border-radius: 5px; font-size: .92em; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 1.4em 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: .94em; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; }
.cite { display: inline-block; min-width: 1.5em; padding: 0 4px; margin: 0 1px; border-radius: 6px; background: var(--accent-soft); color: var(--accent); font-size: 11px; line-height: 1.6; text-align: center; vertical-align: super; }

.card-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.done-tag { font-size: 12px; color: var(--accent); font-weight: 600; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.tag { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 999px; background: var(--surface-2); color: var(--ink-2); }
.tag.draft { background: var(--warm-soft); color: var(--ink); border: 1px solid var(--warm-line); }
.reader > .tag { margin-bottom: 8px; }
.progress { font-size: 13px; color: var(--ink-2); }
.role-switch { display: flex; align-items: center; gap: 10px; margin: 0 0 8px; font-size: 14px; color: var(--ink-2); }
.role-switch .tabs button { font-size: 14px; }
.draft-note { margin: 0 0 16px; padding: 8px 12px; border-radius: 10px; background: var(--warm-soft); border: 1px solid var(--warm-line); font-size: 13px; }
.ask-box { margin-top: 28px; padding: 16px 18px; border-radius: 12px; background: var(--accent-soft); }
.ask-box h3 { margin: 0 0 10px; font-size: 15px; color: var(--accent); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1px solid var(--accent); background: var(--surface); color: var(--accent); border-radius: 999px; padding: 6px 14px; font-size: 14px; text-align: left; }
@media (hover: hover) { .chip:hover { background: var(--accent); color: var(--accent-ink); } }
.reader-foot { display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between; margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--line); }
.course-grid + .section-title { margin-top: 32px; }

/* ---------- library ---------- */
.dropzone {
  display: block;
  border: 1.5px dashed var(--line);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
  margin-bottom: 24px;
  transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone.over { border-color: var(--accent); background: var(--accent-soft); }
.dropzone strong { color: var(--accent); display: block; font-size: 16px; margin-bottom: 4px; }
.dropzone input { display: none; }
.section-title { font-size: 15px; font-weight: 600; margin: 28px 0 10px; color: var(--ink-2); }
.doc-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.doc {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
}
.doc-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.doc-title { font-weight: 600; flex: 1; min-width: 160px; overflow-wrap: anywhere; }
.doc-meta { color: var(--ink-2); font-size: 13px; }
.doc-actions { display: flex; gap: 8px; }
.credit { font-size: 12px; margin: -4px 0 10px; }
.doc-source { display: inline-block; margin-top: 8px; font-size: 13px; color: var(--accent); }
.doc-preview { margin: 12px 0 0; padding: 12px; background: var(--surface-2); border-radius: 8px; white-space: pre-wrap; font-size: 14px; max-height: 280px; overflow-y: auto; }
.doc.loading { color: var(--ink-2); font-style: italic; }

/* ---------- notes ---------- */
.notes { display: grid; grid-template-columns: 260px 1fr; gap: 20px; align-items: start; }
.notes-list ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.note-item { width: 100%; text-align: left; background: none; border: 1px solid transparent; border-radius: 10px; padding: 10px 12px; }
@media (hover: hover) { .note-item:hover { background: var(--surface-2); } }
.note-item.active { background: var(--surface); border-color: var(--line); box-shadow: var(--shadow); }
.note-item b { display: block; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.note-item small { color: var(--ink-2); }
.note-editor { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; min-height: 420px; display: flex; flex-direction: column; gap: 12px; }
.note-editor .back { display: none; align-self: flex-start; }
.note-title { border: 0; border-bottom: 1px solid var(--line); background: transparent; font-size: 20px; font-weight: 600; padding: 4px 0 8px; }
.note-title:focus { outline: none; border-bottom-color: var(--accent); }
.note-tools { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.tabs { display: inline-flex; background: var(--surface-2); border-radius: 10px; padding: 3px; }
.tabs button { border: 0; background: none; padding: 4px 14px; border-radius: 8px; font-size: 13px; color: var(--ink-2); }
.tabs button.on { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.save-state { font-size: 12px; color: var(--ink-2); margin-left: auto; }
.note-body { flex: 1; min-height: 320px; resize: vertical; border: 0; background: transparent; line-height: 1.8; font-size: 15px; }
.note-body:focus { outline: none; }
.note-preview { flex: 1; min-height: 320px; line-height: 1.8; }
.note-placeholder { color: var(--ink-2); margin: auto; text-align: center; }

.notes-search { display: flex; gap: 8px; margin-bottom: 12px; }
.notes-search input { flex: 1; min-width: 0; padding: 7px 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.assist { position: relative; }
.assist summary { list-style: none; cursor: pointer; display: inline-block; }
.assist summary::-webkit-details-marker { display: none; }
.assist[open] summary { border-color: var(--accent); color: var(--accent); }
.assist-menu { position: absolute; z-index: 15; top: calc(100% + 6px); left: 0; width: 240px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); padding: 8px; display: flex; flex-direction: column; }
.assist-menu p { margin: 2px 6px 6px; font-size: 12px; color: var(--ink-2); }
.assist-menu button { background: none; border: 0; text-align: left; padding: 8px 10px; border-radius: 8px; }
@media (hover: hover) { .assist-menu button:hover { background: var(--accent-soft); color: var(--accent); } }
.assist-result { min-height: 90px; }
.tpl-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.tpl { text-align: left; border: 1px solid var(--line); background: var(--bg); border-radius: 12px; padding: 12px 14px; display: flex; flex-direction: column; gap: 2px; }
@media (hover: hover) { .tpl:hover { border-color: var(--accent); } }
.tpl small { color: var(--ink-2); }
.role-pick { display: flex; flex-wrap: wrap; gap: 10px; }
.role-pick .primary { flex: 1; min-width: 120px; padding: 12px; font-size: 16px; }

/* Narrow content area (e.g. laptop with chat panel open): list above editor. */
@container (max-width: 680px) {
  .notes { grid-template-columns: 1fr; }
  .notes-list ul { max-height: 220px; overflow-y: auto; }
  .note-editor { min-height: 360px; }
}

/* ---------- chat ---------- */
.chat {
  width: 400px;
  flex: none;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--line);
  background: var(--surface);
  min-height: 0;
}
.chat-head { display: flex; align-items: center; justify-content: space-between; padding: 18px 18px 10px; }
.chat-head h2 { margin: 0; font-size: 17px; font-weight: 600; }
.mock-banner { margin: 0 18px 10px; padding: 8px 12px; border-radius: 10px; background: var(--warm-soft); border: 1px solid var(--warm-line); font-size: 13px; }
.plan-line { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 0 18px 10px; padding: 6px 12px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); font-size: 13px; }
.plan-line .linklike { font-weight: 600; white-space: nowrap; }
.pay-qr { display: block; width: min(220px, 70%); margin: 4px auto; border-radius: 12px; border: 1px solid var(--line); background: #fff; }
.dlg ol { margin: 0; padding-left: 1.3em; display: flex; flex-direction: column; gap: 4px; }
.scope { display: flex; align-items: center; gap: 10px; padding: 0 18px 12px; font-size: 13px; color: var(--ink-2); border-bottom: 1px solid var(--line); }
.scope select { flex: 1; min-width: 0; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); }
.messages { flex: 1; overflow-y: auto; padding: 16px 18px; display: flex; flex-direction: column; gap: 14px; }
.chat-intro { color: var(--ink-2); font-size: 14px; background: var(--bg); border-radius: 12px; padding: 14px 16px; }
.chat-intro p { margin: 4px 0; }
.msg { max-width: 100%; overflow-wrap: anywhere; }
.msg.user { align-self: flex-end; max-width: 88%; background: var(--accent); color: var(--accent-ink); padding: 9px 14px; border-radius: 14px 14px 4px 14px; white-space: pre-wrap; }
.msg.ai { background: var(--bg); padding: 12px 14px; border-radius: 4px 14px 14px 14px; }
.msg.notice { color: var(--ink-2); font-size: 14px; background: var(--bg); padding: 10px 14px; border-radius: 12px; }
.msg.error { color: var(--danger); background: var(--danger-soft); padding: 10px 14px; border-radius: 12px; font-size: 14px; }
.typing::after { content: attr(data-label); color: var(--ink-2); font-size: 13px; }
.sources { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; font-size: 13px; }
.sources-label { color: var(--ink-2); }
.src { border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.src summary { padding: 5px 10px; cursor: pointer; list-style: none; display: flex; gap: 6px; align-items: baseline; }
.src summary::-webkit-details-marker { display: none; }
.src summary .kind { margin-left: auto; color: var(--ink-2); font-size: 12px; flex: none; }
.src blockquote { margin: 0; padding: 8px 10px 10px; border-top: 1px solid var(--line); color: var(--ink-2); white-space: pre-wrap; max-height: 200px; overflow-y: auto; }
.msg-actions { display: flex; gap: 8px; margin-top: 10px; }
.general-note { margin: 10px 0 0; padding: 6px 10px; border-radius: 8px; background: var(--warm-soft); border: 1px solid var(--warm-line); font-size: 12.5px; color: var(--ink-2); }

.crisis { background: var(--warm-soft); border: 1px solid var(--warm-line); border-radius: 12px; padding: 14px 16px; }
.crisis h3 { margin: 0 0 6px; font-size: 15px; }
.crisis p { margin: 6px 0; }
.hotlines { list-style: none; margin: 10px 0 4px; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.hotlines a { display: flex; justify-content: space-between; gap: 10px; padding: 8px 12px; border-radius: 10px; background: var(--surface); border: 1px solid var(--warm-line); color: var(--ink); text-decoration: none; }
.hotlines a b { color: var(--danger); font-size: 17px; }
.crisis small { color: var(--ink-2); }

.composer { display: flex; gap: 8px; padding: 12px 18px 6px; border-top: 1px solid var(--line); align-items: flex-end; }
.composer textarea { flex: 1; resize: none; border: 1px solid var(--line); border-radius: 12px; padding: 9px 12px; background: var(--bg); max-height: 160px; line-height: 1.5; }
.composer textarea:focus { outline: none; border-color: var(--accent); }
.fineprint { margin: 0; padding: 4px 18px 14px; font-size: 12px; color: var(--ink-2); }

/* ---------- selection toolbar, dialog, toast ---------- */
.sel-toolbar { position: fixed; z-index: 30; display: flex; background: var(--ink); border-radius: 10px; box-shadow: var(--shadow); overflow: hidden; }
.sel-toolbar button { background: none; border: 0; color: var(--bg); padding: 8px 14px; font-size: 14px; }
.sel-toolbar button + button { border-left: 1px solid rgb(255 255 255 / 20%); }
@media (hover: hover) { .sel-toolbar button:hover { background: rgb(255 255 255 / 12%); } }

dialog { border: 0; border-radius: 18px; padding: 0; width: min(520px, calc(100vw - 32px)); background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
dialog::backdrop { background: rgb(30 25 20 / 45%); }
.dlg { padding: 24px; display: flex; flex-direction: column; gap: 14px; max-height: 85vh; overflow-y: auto; }
.dlg h2 { margin: 0; font-size: 19px; }
.dlg p { margin: 0; }
.dlg label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--ink-2); }
.dlg select, .dlg input { padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); font-size: 15px; }
.dlg .preview { background: var(--bg); border-radius: 10px; padding: 12px 14px; max-height: 220px; overflow-y: auto; font-size: 14px; }
.dlg menu { display: flex; justify-content: flex-end; gap: 8px; margin: 4px 0 0; padding: 0; }
.dlg .meta { font-size: 13px; color: var(--ink-2); }

.toast { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%); z-index: 40; background: var(--ink); color: var(--bg); padding: 10px 18px; border-radius: 12px; box-shadow: var(--shadow); font-size: 14px; max-width: calc(100vw - 32px); }
.toast.error { background: var(--danger); color: #fff; }

/* ---------- sign-in screen ---------- */
.auth { display: none; min-height: 100vh; min-height: 100dvh; padding: 32px 16px; align-items: center; justify-content: center; }
body[data-auth="out"] .auth { display: flex; }
body[data-auth="out"] .app, body[data-auth="out"] .topbar,
body[data-auth="pending"] .app, body[data-auth="pending"] .topbar { display: none; }
.auth-card { width: min(420px, 100%); background: var(--surface); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); padding: 28px; display: flex; flex-direction: column; gap: 16px; }
.auth-top { display: flex; align-items: center; justify-content: space-between; }
.auth-tagline { margin: 0; color: var(--ink-2); font-size: 14px; }
.auth-tabs { align-self: flex-start; }
.auth-form { display: flex; flex-direction: column; gap: 12px; }
.auth-form label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--ink-2); }
.auth-form input[type="email"], .auth-form input[type="password"], .auth-form input[type="text"] { padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); font-size: 15px; }
.auth-form input:focus { outline: none; border-color: var(--accent); }
.auth-form label.check { flex-direction: row; align-items: flex-start; gap: 8px; color: var(--ink); font-size: 14px; }
.auth-form label.check input { margin-top: 3px; }
.auth-form .primary { padding: 11px; font-size: 16px; }
.auth-error { margin: 0; min-height: 1.2em; color: var(--danger); font-size: 14px; }
.auth-note { margin: 0; color: var(--ink-2); font-size: 13px; }

/* ---------- account dialog ---------- */
.dlg h3 { margin: 6px 0 0; font-size: 15px; }
.dlg .field-row { display: flex; flex-direction: column; gap: 8px; }
.dlg input[type="password"] { padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); font-size: 15px; }
.dlg hr { border: 0; border-top: 1px solid var(--line); margin: 4px 0; width: 100%; }
.dlg .ok { color: var(--accent); font-size: 14px; margin: 0; }
.dlg .bad { color: var(--danger); font-size: 14px; margin: 0; }

/* ---------- tablet / phone ---------- */
@media (max-width: 1080px) {
  .chat { width: 340px; }
  .rail { width: 168px; }
}

@media (max-width: 860px) {
  /* Phone: top bar, content and bottom tab bar fill the screen exactly; only the content scrolls.
     No fixed pixel heights, so notches and home indicators (safe areas) are handled. */
  body { display: flex; flex-direction: column; height: 100vh; height: 100dvh; overflow: hidden; }
  body[data-auth="out"], body[data-auth="pending"] { display: block; height: auto; overflow: visible; }
  .topbar {
    display: flex; align-items: center; justify-content: space-between; gap: 8px; flex: none;
    padding: 8px 12px; padding-top: max(8px, env(safe-area-inset-top));
    background: var(--bg); border-bottom: 1px solid var(--line);
  }
  .topbar .brand-mark { font-size: 20px; }
  .topbar-actions { gap: 6px; }
  .lang-btn, .help-chip { min-height: 36px; padding: 0 12px; display: inline-flex; align-items: center; }
  .help-chip { background: var(--danger-soft); color: var(--danger); border: 0; border-radius: 999px; font-size: 13px; }
  .app { flex: 1; min-height: 0; flex-direction: column; height: auto; }

  .rail {
    order: 2; flex: none; width: auto; flex-direction: row; justify-content: space-around; gap: 0;
    padding: 4px 4px max(4px, env(safe-area-inset-bottom));
    border-right: 0; border-top: 1px solid var(--line); background: var(--surface);
  }
  .brand, .rail-foot { display: none; }
  .nav-item { flex-direction: column; justify-content: center; gap: 2px; padding: 6px 4px; min-height: 52px; font-size: 11px; flex: 1; align-items: center; text-align: center; }
  .nav-chat { display: flex; }

  .main { flex: 1; min-height: 0; overflow-y: auto; }
  .view { padding: 16px 12px 28px; }
  .view-head h1 { font-size: 21px; }
  .reader { padding: 18px 16px; }
  .reader h1 { font-size: 22px; }
  .reader .prose { font-size: 16px; }

  /* Chat is its own tab; a compact header leaves the space for the conversation. */
  .chat { display: none; flex: 1; min-height: 0; width: auto; border-left: 0; }
  body[data-view="chat"] .chat { display: flex; }
  body[data-view="chat"] .main { display: none; }
  .chat-head { padding: 10px 14px 6px; }
  .chat-head h2 { font-size: 16px; }
  .mock-banner, .plan-line { margin: 0 14px 6px; padding: 5px 10px; font-size: 12px; }
  .scope { padding: 0 14px 8px; }
  .messages { padding: 12px 14px; }
  .composer { padding: 8px 12px; }
  .fineprint { display: none; } /* the same notice is shown at sign-up and under About */

  /* Bigger tap targets */
  .small { min-height: 36px; }
  .tabs button { min-height: 34px; padding: 4px 14px; }
  .role-switch .tabs button { min-height: 36px; }
  .src summary { min-height: 40px; align-items: center; }
  .plan-line .linklike { padding: 8px 4px; }
  .chip { min-height: 40px; }
  input[type="checkbox"] { width: 20px; height: 20px; flex: none; }

  /* Dialogs: narrower padding; buttons wrap onto a new row instead of squeezing their text. */
  .dlg { padding: 18px 16px; }
  .dlg menu { flex-wrap: wrap; }
  .dlg menu button { white-space: nowrap; flex: 1 1 auto; min-height: 40px; }

  /* 16px text in fields stops iPhone Safari from zooming in while typing. */
  input, textarea, select, .composer textarea, .dlg input, .dlg select,
  .auth-form input[type="email"], .auth-form input[type="password"], .auth-form input[type="text"] { font-size: 16px; }

  /* Notebook */
  .notes { grid-template-columns: 1fr; }
  .notes[data-mode="edit"] .notes-list { display: none; }
  .notes[data-mode="list"] .note-editor { display: none; }
  .note-editor { padding: 14px; min-height: 0; }
  .note-editor .back { display: inline; }
  .note-tools { row-gap: 8px; }
  .save-state { order: 10; flex-basis: 100%; margin-left: 0; text-align: right; }
  .note-body, .note-preview { min-height: 50vh; font-size: 16px; }

  /* The AI writing menu opens as a panel above the tab bar, not beside its button. */
  .assist-menu { position: fixed; left: 12px; right: 12px; top: auto; bottom: calc(72px + env(safe-area-inset-bottom)); width: auto; z-index: 30; }
  .assist-menu button { min-height: 44px; font-size: 16px; }
}