:root {
  --bg: #f4f6f8;
  --bg-elevated: #ffffff;
  --bg-sunken: #e9edf1;
  --text: #14213d;
  --text-dim: #5b6778;
  --border: #dde3ea;
  --accent: #0e7c86;
  --accent-contrast: #ffffff;
  --navy: #0b2447;
  --coach: #2e6fd9;
  --coach-bg: #eaf1fd;
  --trap: #b45309;
  --trap-bg: #fdf0e0;
  --fact: #0e7c86;
  --fact-bg: #e3f4f4;
  --fillin: #8a3ffc;
  --fillin-bg: #f2eaff;
  --script-bg: #eef0f2;
  --danger: #c0392b;
  --radius: 14px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --bg-elevated: #141d2e;
  --bg-sunken: #0e1626;
  --text: #e7ecf3;
  --text-dim: #9aa7ba;
  --border: #24314a;
  --accent: #2dd4c6;
  --accent-contrast: #06231f;
  --navy: #a9c1e8;
  --coach: #7aa6f7;
  --coach-bg: #16233d;
  --trap: #e0a24a;
  --trap-bg: #2c2110;
  --fact: #2dd4c6;
  --fact-bg: #10282a;
  --fillin: #c79bff;
  --fillin-bg: #221a33;
  --script-bg: #182234;
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1220;
    --bg-elevated: #141d2e;
    --bg-sunken: #0e1626;
    --text: #e7ecf3;
    --text-dim: #9aa7ba;
    --border: #24314a;
    --accent: #2dd4c6;
    --accent-contrast: #06231f;
    --navy: #a9c1e8;
    --coach: #7aa6f7;
    --coach-bg: #16233d;
    --trap: #e0a24a;
    --trap-bg: #2c2110;
    --fact: #2dd4c6;
    --fact-bg: #10282a;
    --fillin: #c79bff;
    --fillin-bg: #221a33;
    --script-bg: #182234;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Inter, Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  overscroll-behavior-y: none;
}
a { color: var(--accent); }
button { font-family: inherit; }

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-top: var(--safe-top);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px calc(14px + var(--safe-right)) 10px calc(14px + var(--safe-left));
  background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar h1 { font-size: 17px; margin: 0; flex: 1; font-weight: 600; }
.icon-btn {
  border: none; background: transparent; color: var(--text);
  width: 40px; height: 40px; border-radius: 10px; font-size: 19px;
  display: flex; align-items: center; justify-content: center; cursor: pointer;
}
.icon-btn:active { background: var(--bg-sunken); }

.layout { flex: 1; display: flex; min-height: 0; }

.sidebar {
  display: none;
  width: 280px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  padding: 16px 10px 16px calc(10px + var(--safe-left));
  overflow-y: auto;
}
.sidebar .brand { font-weight: 700; font-size: 18px; padding: 8px 10px 16px; color: var(--navy); }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: 10px; color: var(--text);
  text-decoration: none; font-size: 15px; cursor: pointer; border: none; background: none;
  width: 100%; text-align: left;
}
.nav-item .ic { font-size: 18px; width: 22px; text-align: center; }
.nav-item:hover, .nav-item.active { background: var(--bg-sunken); }
.nav-item.active { color: var(--accent); font-weight: 600; }

main.content {
  flex: 1;
  overflow-y: auto;
  padding: 16px calc(16px + var(--safe-right)) 96px calc(16px + var(--safe-left));
  max-width: 760px;
  margin: 0 auto;
  width: 100%;
}

.tabbar {
  position: sticky; bottom: 0; z-index: 20;
  display: flex;
  background: color-mix(in srgb, var(--bg-elevated) 94%, transparent);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--border);
  padding: 6px calc(4px + var(--safe-right)) calc(6px + var(--safe-bottom)) calc(4px + var(--safe-left));
}
.tab-item {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px;
  border: none; background: none; color: var(--text-dim); padding: 6px 2px;
  font-size: 11px; border-radius: 10px; cursor: pointer; min-height: 44px;
}
.tab-item .ic { font-size: 21px; }
.tab-item.active { color: var(--accent); }

@media (min-width: 860px) {
  .sidebar { display: block; }
  .tabbar { display: none; }
  main.content { padding-bottom: 40px; }
}

/* --- Dashboard --- */
.hero {
  background: linear-gradient(135deg, var(--navy), var(--accent));
  color: #fff; border-radius: var(--radius); padding: 20px; margin-bottom: 18px;
}
:root[data-theme="dark"] .hero, @media (prefers-color-scheme: dark) { }
.hero .count { font-size: 34px; font-weight: 700; }
.hero .label { opacity: .85; font-size: 13px; }
.date-row { display: flex; gap: 8px; margin-top: 10px; align-items: center; flex-wrap: wrap; }
.date-row input[type="date"] {
  border-radius: 8px; border: none; padding: 8px 10px; font-size: 14px;
}

.progress-ring-wrap { display: flex; align-items: center; gap: 14px; }
.progress-track { background: var(--bg-sunken); border-radius: 999px; height: 10px; flex: 1; overflow: hidden; }
.progress-fill { background: var(--accent); height: 100%; border-radius: 999px; transition: width .3s; }

.card-grid { display: grid; grid-template-columns: 1fr; gap: 10px; }
@media (min-width: 520px) { .card-grid { grid-template-columns: 1fr 1fr; } }
.module-card {
  display: block; text-align: left; border: 1px solid var(--border); background: var(--bg-elevated);
  border-radius: var(--radius); padding: 14px; cursor: pointer; color: var(--text);
}
.module-card .ic { font-size: 22px; }
.module-card .title { font-weight: 600; margin: 6px 0 2px; font-size: 15px; }
.module-card .desc { font-size: 13px; color: var(--text-dim); }
.module-card .badge {
  display: inline-block; margin-top: 8px; font-size: 11px; padding: 2px 8px;
  border-radius: 999px; background: var(--bg-sunken); color: var(--text-dim);
}

/* --- Section content --- */
.section-block { margin-bottom: 22px; }
.section-block h2 { font-size: 20px; margin: 0 0 4px; }
.section-block h3 { font-size: 17px; margin: 18px 0 4px; }
.section-block h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-dim); margin: 16px 0 6px; }
.read-toggle {
  border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text-dim);
  border-radius: 999px; font-size: 12px; padding: 5px 12px; cursor: pointer; margin-bottom: 8px;
}
.read-toggle.done { background: var(--fact-bg); color: var(--fact); border-color: transparent; }

p.block-p { margin: 8px 0; }
.block-highlight {
  border-left: 3px solid var(--navy); padding: 6px 12px; margin: 10px 0;
  font-weight: 600; background: var(--bg-sunken); border-radius: 0 8px 8px 0;
}

.callout { border-radius: 10px; padding: 10px 14px; margin: 10px 0; font-size: 14.5px; }
.callout .cap { font-weight: 700; font-size: 11px; letter-spacing: .03em; text-transform: uppercase; display: flex; align-items: center; gap: 6px; margin-bottom: 4px; }
.callout.coach { background: var(--coach-bg); color: var(--text); }
.callout.coach .cap { color: var(--coach); }
.callout.trap { background: var(--trap-bg); color: var(--text); }
.callout.trap .cap { color: var(--trap); }
.callout.fact { background: var(--fact-bg); color: var(--text); }
.callout.fact .cap { color: var(--fact); }
.callout.fillin { background: var(--fillin-bg); color: var(--text); }
.callout.fillin .cap { color: var(--fillin); }

.script-box { background: var(--script-bg); border-radius: 10px; padding: 12px 14px; margin: 10px 0; }
.script-box .cap { font-size: 11px; font-weight: 700; letter-spacing: .03em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 6px; display: flex; align-items: center; gap: 6px; }
.script-box .cap::before { content: '🗣️'; }
.script-box p { margin: 0 0 8px; font-style: italic; }
.script-box p:last-child { margin-bottom: 0; }

.field-row { display: flex; gap: 8px; margin: 6px 0; font-size: 14.5px; flex-wrap: wrap; }
.field-row .flabel { font-weight: 700; flex-shrink: 0; }
.field-row .fvalue { flex: 1; min-width: 200px; }

.fillin-block { margin: 10px 0; }
.fillin-block textarea {
  width: 100%; min-height: 64px; border-radius: 10px; border: 1px dashed var(--fillin);
  background: var(--fillin-bg); color: var(--text); padding: 10px 12px; font: inherit; resize: vertical;
}
.blank {
  display: inline-block; min-width: 90px; border-bottom: 2px solid var(--fillin);
  padding: 0 4px; color: var(--text); font-style: normal;
}
.blank:empty::before { content: attr(data-placeholder); color: var(--text-dim); font-style: italic; }
.blank:focus { outline: none; background: var(--fillin-bg); }

table.doc-table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 14px; }
.table-group-label { font-size: 12px; font-weight: 700; text-transform: uppercase; color: var(--text-dim); margin-top: 14px; }
table.doc-table th { display: none; }
table.doc-table tr {
  display: block; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 8px; padding: 8px 12px; background: var(--bg-elevated);
}
table.doc-table td { display: block; padding: 3px 0; border: none; }
table.doc-table td::before { content: attr(data-label); font-weight: 700; display: block; font-size: 11px; text-transform: uppercase; color: var(--text-dim); }
@media (min-width: 700px) {
  table.doc-table { border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
  table.doc-table th {
    display: table-cell; text-align: left; background: var(--bg-sunken); padding: 8px 10px; font-size: 12px;
    text-transform: uppercase; color: var(--text-dim);
  }
  table.doc-table tr { display: table-row; border: none; margin: 0; padding: 0; border-bottom: 1px solid var(--border); background: transparent; }
  table.doc-table td { display: table-cell; padding: 8px 10px; vertical-align: top; }
  table.doc-table td::before { display: none; }
}

ul.doc-list, ol.doc-list { padding-left: 20px; margin: 8px 0; }
ul.doc-list li, ol.doc-list li { margin: 4px 0; }
.check-item { display: flex; align-items: flex-start; gap: 10px; list-style: none; margin: 6px 0 !important; }
.check-item input { width: 20px; height: 20px; flex-shrink: 0; margin-top: 1px; accent-color: var(--accent); }
.check-item.done label { text-decoration: line-through; color: var(--text-dim); }
ul.check-list { padding-left: 0; }

.diagram-wrap { position: relative; margin: 10px 0; }
pre.diagram {
  background: var(--bg-sunken); border-radius: 10px; padding: 12px; overflow-x: auto;
  font-size: 12px; line-height: 1.4; margin: 0; touch-action: pan-x pan-y pinch-zoom;
}
.diagram-expand {
  position: absolute; top: 8px; right: 8px; border: none; background: var(--bg-elevated);
  border-radius: 8px; padding: 4px 8px; font-size: 12px; cursor: pointer; opacity: .85;
}
.diagram-modal {
  position: fixed; inset: 0; background: rgba(0,0,0,.7); z-index: 100;
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.diagram-modal pre { background: var(--bg-elevated); max-height: 90vh; max-width: 96vw; overflow: auto; padding: 16px; border-radius: 12px; }

/* --- Cards / practice / flashcards --- */
.flash-card {
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 16px;
  padding: 22px; min-height: 220px; display: flex; flex-direction: column; justify-content: center;
  text-align: center; gap: 10px;
}
.flash-card .term { font-size: 22px; font-weight: 700; }
.flash-card .cat { font-size: 12px; color: var(--text-dim); text-transform: uppercase; }
.flash-card .def { font-size: 16px; color: var(--text-dim); }
.flash-controls { display: flex; gap: 10px; margin-top: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
  border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text);
  border-radius: 10px; padding: 10px 16px; font-size: 14px; cursor: pointer; min-height: 44px;
}
.btn.primary { background: var(--accent); color: var(--accent-contrast); border-color: transparent; font-weight: 600; }
.btn.ghost { background: transparent; }
.btn.rate-easy { border-color: var(--fact); color: var(--fact); }
.btn.rate-shaky { border-color: var(--trap); color: var(--trap); }
.btn.rate-hard { border-color: var(--danger); color: var(--danger); }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0; }
.btn.chip { padding: 6px 12px; font-size: 13px; border-radius: 999px; min-height: auto; }
.btn.chip.active { background: var(--accent); color: var(--accent-contrast); border-color: transparent; }

.timer-display { font-size: 40px; font-weight: 700; font-variant-numeric: tabular-nums; text-align: center; margin: 6px 0; }
.timer-display.warn { color: var(--trap); }
.timer-display.over { color: var(--danger); }

.search-box { display: flex; align-items: center; gap: 8px; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; margin-bottom: 14px; }
.search-box input { border: none; background: none; outline: none; font: inherit; flex: 1; color: var(--text); }
.result-item { padding: 10px 4px; border-bottom: 1px solid var(--border); cursor: pointer; }
.result-item .rtitle { font-weight: 600; font-size: 14.5px; }
.result-item .rmeta { font-size: 12px; color: var(--text-dim); }

.empty-state { text-align: center; padding: 40px 16px; color: var(--text-dim); }

.legend-item { display: flex; gap: 10px; align-items: flex-start; margin: 12px 0; }
.legend-item .swatch { width: 26px; height: 26px; border-radius: 8px; flex-shrink: 0; }

.people-tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.subnav-list { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; margin-bottom: 16px; background: var(--bg-elevated); }
.subnav-list button { width: 100%; text-align: left; padding: 12px 14px; border: none; background: none; color: var(--text); font-size: 14.5px; border-bottom: 1px solid var(--border); cursor: pointer; display: flex; justify-content: space-between; }
.subnav-list button:last-child { border-bottom: none; }
.subnav-list button:active { background: var(--bg-sunken); }
.subnav-list .arrow { color: var(--text-dim); }

.breadcrumb { font-size: 13px; color: var(--text-dim); margin-bottom: 8px; cursor: pointer; }

.toast {
  position: fixed; bottom: calc(70px + var(--safe-bottom)); left: 50%; transform: translateX(-50%);
  background: var(--navy); color: #fff; padding: 8px 16px; border-radius: 999px; font-size: 13px; z-index: 200;
}
@media (min-width: 860px) { .toast { bottom: 24px; } }