/* Reforge styles.
   Light, luxurious and easy on the eyes for long sessions:
   warm ivory paper, ink-navy text, deep navy actions, antique gold highlights.
   Every colour, size and radius comes from the variables below. */

:root {
  /* Lookbook variables */
  --bg: #f6f2e9;
  --surface: #fffdf8;
  --text: #1a2233;
  --text-muted: #566072;
  --accent: #1f3557;
  --accent-contrast: #fbf8f1;
  --border: #e5dccb;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(70, 52, 22, 0.04), 0 10px 30px rgba(70, 52, 22, 0.06);
  --section-space: 48px;
  --font-display: "Cormorant Garamond", "Iowan Old Style", Georgia, serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;

  /* Extended palette */
  --bg-deep: #efe8da;
  --surface-sunken: #f4efe4;
  --glass: rgba(251, 248, 241, 0.72);
  --text-faint: #626979;
  --accent-hover: #162843;
  --accent-soft: #e6ebf2;
  --gold: #a8833c;
  --gold-text: #82632a;
  --gold-soft: #f2e7cf;
  --gold-wash: #faf3e3;
  --gold-deep: #7a5b22;
  --gold-deeper: #684c1a;
  --border-strong: #d5c9b1;
  --focus: #3a6ea5;
  --danger: #9b2c2c;
  --danger-soft: #f7e6e2;
  --danger-line: #e2b9b2;
  --success: #2f6b4f;
  --success-soft: #e3efe7;
  --mark: #f3e2b3;
  --scrim: rgba(26, 34, 51, 0.32);
  --hairline: rgba(0, 0, 0, 0.06);
  --on-accent-tint: rgba(255, 255, 255, 0.12);
  --paper: #ffffff;
  --shadow-lift: 0 1px 2px rgba(70, 52, 22, 0.05), 0 18px 40px rgba(70, 52, 22, 0.1);
  --shadow-sheet: 0 30px 80px rgba(26, 34, 51, 0.22);
  --shadow-toast: 0 12px 30px rgba(26, 34, 51, 0.25);
  --shadow-tab: 0 1px 3px rgba(70, 52, 22, 0.1);

  /* Subject colours: muted, distinct, all readable on ivory */
  --subject-navy: #2c4a7a;
  --subject-sage: #557359;
  --subject-burgundy: #8a3a45;
  --subject-ochre: #9c7024;
  --subject-teal: #2d6a6e;
  --subject-plum: #67497a;
  --subject-slate: #556072;
  --subject-terracotta: #a65a3a;

  /* Spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --radius-sm: 10px;
  --radius-pill: 999px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --dur: 240ms;
  --sidebar-w: 248px;
  --tabbar-h: 64px;
  --content-max: 960px;
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
h1, h2, h3, p { margin: 0; }
h1, h2 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.1;
}
h1 { font-size: clamp(2.25rem, 1.6rem + 2.6vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 1.3rem + 1.2vw, 2rem); }
h3 { font-size: 1.0625rem; font-weight: 600; line-height: 1.35; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-hover); }
button, input, textarea, select { font: inherit; color: inherit; }
svg { flex-shrink: 0; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 6px; }
::selection { background: var(--mark); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: var(--space-4); top: -60px; z-index: 100;
  background: var(--accent); color: var(--accent-contrast);
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-sm);
}
.skip-link:focus { top: var(--space-4); color: var(--accent-contrast); }

/* App frame */
.app { min-height: 100vh; min-height: 100dvh; }

.brand {
  display: inline-flex; align-items: center; gap: var(--space-3);
  text-decoration: none; color: var(--text);
}
.brand-mark { width: 32px; height: 32px; }
.brand-mark rect { fill: var(--accent); }
.brand-mark path { fill: none; stroke: var(--gold-soft); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.brand-name { font-family: var(--font-display); font-size: 1.6rem; font-weight: 600; letter-spacing: 0.01em; }

.sidebar { display: none; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center;
  padding: calc(var(--space-3) + env(safe-area-inset-top)) var(--space-4) var(--space-3);
  background: var(--glass);
  -webkit-backdrop-filter: saturate(1.4) blur(18px);
  backdrop-filter: saturate(1.4) blur(18px);
  border-bottom: 1px solid var(--border);
}

.view {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) calc(var(--tabbar-h) + var(--space-7) + env(safe-area-inset-bottom));
  outline: none;
}

/* Bottom tab bar (phones) */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
  display: grid; grid-template-columns: repeat(5, 1fr);
  height: calc(var(--tabbar-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--glass);
  -webkit-backdrop-filter: saturate(1.4) blur(18px);
  backdrop-filter: saturate(1.4) blur(18px);
  border-top: 1px solid var(--border);
}
.tabbar a {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  min-height: 44px;
  font-size: 0.75rem; font-weight: 500; text-decoration: none;
  color: var(--text-muted);
  transition: color var(--dur) var(--ease);
}
.tabbar a svg { width: 22px; height: 22px; }
.tabbar a[aria-current="page"] { color: var(--accent); }
.tabbar a[aria-current="page"] svg { stroke-width: 2; }

/* Icons */
.icon { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

/* Desktop: sidebar */
@media (min-width: 900px) {
  .topbar, .tabbar { display: none; }
  .sidebar {
    position: fixed; inset: 0 auto 0 0; z-index: 20;
    width: var(--sidebar-w);
    display: flex; flex-direction: column; gap: var(--space-6);
    padding: var(--space-6) var(--space-4);
    background: var(--bg-deep);
    border-right: 1px solid var(--border);
  }
  .sidebar .brand { padding: 0 var(--space-3); }
  .nav { display: flex; flex-direction: column; gap: var(--space-1); }
  .nav a {
    position: relative;
    display: flex; align-items: center; gap: var(--space-3);
    min-height: 44px; padding: 0 var(--space-3);
    border-radius: var(--radius-sm);
    color: var(--text-muted); text-decoration: none; font-weight: 500;
    transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
  }
  .nav a:hover { background: var(--surface-sunken); color: var(--text); }
  .nav a[aria-current="page"] { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }
  .nav a[aria-current="page"]::before {
    content: ""; position: absolute; left: 0; top: 12px; bottom: 12px; width: 2px;
    border-radius: 2px; background: var(--gold);
  }
  .nav a[aria-current="page"] .icon { color: var(--accent); }
    .sidebar-foot { margin-top: auto; padding: 0 var(--space-3); font-size: 0.8125rem; color: var(--text-muted); }
  .view {
    margin-left: calc(var(--sidebar-w) + max(0px, (100vw - var(--sidebar-w) - var(--content-max)) / 2));
    padding: var(--space-8) var(--space-7) var(--space-8);
  }
}

/* Page header */
.page-head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-6); }
.page-head .eyebrow { margin-bottom: var(--space-2); }
.page-head p.lead { margin-top: var(--space-2); color: var(--text-muted); max-width: 52ch; }
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--gold-text);
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: var(--gold); }
.head-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.back {
  display: inline-flex; align-items: center; gap: var(--space-1);
  min-height: 44px; margin: calc(var(--space-3) * -1) 0 var(--space-2) calc(var(--space-2) * -1);
  padding: 0 var(--space-2);
  color: var(--text-muted); text-decoration: none; font-size: 0.9375rem; font-weight: 500;
}
.back:hover { color: var(--text); }
.back .icon { width: 18px; height: 18px; }

.section { margin-top: var(--section-space); }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-4); }
.section-head h2 { font-size: 1.6rem; }
.count { color: var(--text-muted); font-size: 0.875rem; font-variant-numeric: tabular-nums; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: 44px; padding: 0 var(--space-5);
  border: 1px solid transparent; border-radius: var(--radius-pill);
  font-size: 0.9375rem; font-weight: 600; letter-spacing: 0.005em;
  text-decoration: none; white-space: nowrap; cursor: pointer;
  background: var(--surface); color: var(--text); border-color: var(--border-strong);
}
.btn:hover { background: var(--surface-sunken); color: var(--text); }
.btn .icon { width: 18px; height: 18px; }
.btn-primary { background: var(--accent); color: var(--accent-contrast); border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); color: var(--accent-contrast); }
.btn-quiet { background: transparent; border-color: transparent; color: var(--text-muted); padding: 0 var(--space-3); }
.btn-quiet:hover { background: var(--surface-sunken); }
.btn-danger { background: var(--danger); color: var(--accent-contrast); border-color: var(--danger); }
.btn-danger:hover { background: var(--danger); filter: brightness(0.92); color: var(--accent-contrast); }
.btn-icon { width: 44px; padding: 0; }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; transform: none; }

/* Fields */
.field { display: grid; gap: var(--space-2); }
.field + .field { margin-top: var(--space-5); }
.label { font-size: 0.875rem; font-weight: 600; }
.hint { font-size: 0.875rem; color: var(--text-muted); }
.input, .textarea, .select {
  width: 100%; min-height: 48px;
  padding: var(--space-3) var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.input::placeholder, .textarea::placeholder { color: var(--text-faint); }
.input:focus, .textarea:focus, .select:focus { outline: none; border-color: var(--focus); box-shadow: 0 0 0 3px var(--accent-soft); }
.textarea { resize: vertical; line-height: 1.65; }
.select {
  appearance: none; -webkit-appearance: none; cursor: pointer;
  padding-right: var(--space-7);
  background-image: linear-gradient(45deg, transparent 50%, var(--text-muted) 50%), linear-gradient(135deg, var(--text-muted) 50%, transparent 50%);
  background-position: calc(100% - 22px) 50%, calc(100% - 16px) 50%;
  background-size: 6px 6px; background-repeat: no-repeat;
}
.input-row { display: flex; gap: var(--space-2); }
.input-row .input { flex: 1; min-width: 0; }

/* Search */
.search { position: relative; margin-bottom: var(--space-6); }
.search .icon { position: absolute; left: var(--space-4); top: 50%; transform: translateY(-50%); color: var(--text-muted); pointer-events: none; }
.search .input { padding-left: calc(var(--space-4) + 28px); border-radius: var(--radius-pill); background: var(--surface); }

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.panel { padding: var(--space-5); }
@media (min-width: 600px) { .panel { padding: var(--space-6); } }
.panel + .panel { margin-top: var(--space-5); }
.panel-head { margin-bottom: var(--space-5); }
.panel-head h2 { font-size: 1.6rem; }
.panel-head p { margin-top: var(--space-1); color: var(--text-muted); font-size: 0.9375rem; }

.subject-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--space-4); }
.subject-card {
  position: relative; display: flex; flex-direction: column; justify-content: space-between; gap: var(--space-6);
  min-height: 148px; padding: var(--space-5);
  color: var(--text); text-decoration: none; overflow: hidden;
}
.subject-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 4px; background: var(--subject, var(--accent));
}
.subject-card:hover { color: var(--text); box-shadow: var(--shadow-lift); }
.subject-card h3 { font-family: var(--font-display); font-size: 1.75rem; font-weight: 600; line-height: 1.1; overflow-wrap: anywhere; }
.subject-meta { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); color: var(--text-muted); font-size: 0.875rem; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--subject, var(--accent)); flex-shrink: 0; }
.subject-card .arrow { color: var(--text-faint); transition: transform var(--dur) var(--ease), color var(--dur) var(--ease); }
.subject-card:hover .arrow { color: var(--accent); transform: translateX(3px); }

.add-card {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: 148px; padding: var(--space-5);
  border: 1px dashed var(--border-strong); border-radius: var(--radius);
  background: transparent; color: var(--text-muted); cursor: pointer; font-weight: 500;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.add-card:hover { border-color: var(--gold); color: var(--text); background: var(--surface); }

/* Note list */
.note-list { list-style: none; margin: 0; padding: 0; overflow: hidden; }
.note-list li + li { border-top: 1px solid var(--border); }
.note-row {
  display: grid; grid-template-columns: 1fr auto; align-items: center; gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  color: var(--text); text-decoration: none;
  transition: background-color var(--dur) var(--ease);
}
.note-row:hover { background: var(--surface-sunken); color: var(--text); }
.note-row h3 { overflow-wrap: anywhere; }
.note-row p { margin-top: var(--space-1); color: var(--text-muted); font-size: 0.875rem; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow-wrap: anywhere; }
.note-row .when { color: var(--text-muted); font-size: 0.8125rem; white-space: nowrap; font-variant-numeric: tabular-nums; }
.note-row .tag { display: inline-flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-1); font-size: 0.75rem; font-weight: 600; color: var(--text-muted); }
.note-row .tag .dot { width: 8px; height: 8px; }
mark { background: var(--mark); color: inherit; border-radius: 3px; padding: 0 2px; }

/* Note editor */
.note-title {
  width: 100%; padding: 0; border: 0; background: transparent;
  font-family: var(--font-display); font-size: clamp(2rem, 1.5rem + 2vw, 2.75rem); font-weight: 600; line-height: 1.15;
  letter-spacing: -0.01em;
}
.note-title:focus { outline: none; }
.note-title::placeholder { color: var(--text-faint); }
.note-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-3); margin: var(--space-3) 0 var(--space-5); color: var(--text-muted); font-size: 0.875rem; }
.note-bar .subject-tag { display: inline-flex; align-items: center; gap: var(--space-2); font-weight: 600; color: var(--text); }
.save-state { display: inline-flex; align-items: center; gap: var(--space-2); }
.save-state::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--success); }
.save-state[data-state="saving"]::before { background: var(--gold); }
.source-text {
  min-height: 52vh; padding: var(--space-5);
  border-radius: var(--radius); border-color: var(--border);
  font-size: 1.0625rem; line-height: 1.75;
}
@media (min-width: 600px) { .source-text { padding: var(--space-6); } }

/* Empty states */
.empty {
  display: grid; justify-items: center; gap: var(--space-3);
  padding: var(--space-8) var(--space-5);
  text-align: center;
}
.empty-mark {
  display: grid; place-items: center; width: 56px; height: 56px; margin-bottom: var(--space-2);
  border-radius: 50%; background: var(--gold-soft); color: var(--gold-text);
}
.empty-mark .icon { width: 24px; height: 24px; }
.empty h2 { font-size: 1.75rem; }
.empty p { max-width: 42ch; color: var(--text-muted); }
.empty .btn { margin-top: var(--space-3); }

/* Settings */
.status-line { display: flex; align-items: flex-start; gap: var(--space-2); margin-top: var(--space-3); font-size: 0.9375rem; }
.status-line[hidden] { display: none; }
.status-line[data-tone="ok"] { color: var(--success); }
.status-line[data-tone="error"] { color: var(--danger); }
.status-line[data-tone="busy"] { color: var(--text-muted); }
.status-line .icon { width: 18px; height: 18px; margin-top: 3px; }
.key-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }
.model-options { display: grid; gap: var(--space-2); }
.radio-card {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding: var(--space-4); border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  cursor: pointer; transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.radio-card:hover { background: var(--surface-sunken); }
.radio-card:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.radio-card input { margin-top: 5px; accent-color: var(--accent); width: 16px; height: 16px; }
.radio-card strong { display: block; font-weight: 600; }
.radio-card span { display: block; font-size: 0.875rem; color: var(--text-muted); }
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
.stat { padding: var(--space-4); border-radius: var(--radius-sm); background: var(--surface-sunken); }
.stat strong { display: block; font-family: var(--font-display); font-size: 2rem; font-weight: 600; line-height: 1.1; font-variant-numeric: tabular-nums; }
.stat span { font-size: 0.875rem; color: var(--text-muted); }

/* Sheet (dialog) */
.sheet {
  width: min(560px, calc(100vw - 2 * var(--space-4)));
  max-height: calc(100dvh - 2 * var(--space-6));
  margin: auto; padding: 0;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: var(--text);
  box-shadow: var(--shadow-sheet);
}
.sheet::backdrop { background: var(--scrim); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); }
.sheet form { display: flex; flex-direction: column; max-height: inherit; }
.sheet-body { padding: var(--space-6) var(--space-5) var(--space-5); overflow-y: auto; }
@media (min-width: 600px) { .sheet-body { padding: var(--space-6); } }
.sheet-body h2 { margin-bottom: var(--space-2); }
.sheet-body > p { color: var(--text-muted); margin-bottom: var(--space-5); }
.sheet-foot {
  display: flex; justify-content: flex-end; flex-wrap: wrap; gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--border); background: var(--surface-sunken);
  border-radius: 0 0 var(--radius) var(--radius);
}
.sheet .textarea { min-height: 220px; }
@media (max-width: 599px) {
  .sheet { width: 100vw; max-width: 100vw; margin: auto 0 0; border-radius: var(--radius) var(--radius) 0 0; border-bottom: 0; max-height: 92dvh; }
  .sheet-foot { border-radius: 0; padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom)); }
  .sheet-foot .btn { flex: 1; }
}

.swatches { display: flex; flex-wrap: wrap; gap: var(--space-3); border: 0; margin: 0; padding: 0; }
.swatch { position: relative; }
.swatch input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.swatch span {
  display: block; width: 40px; height: 40px; border-radius: 50%;
  background: var(--subject); box-shadow: inset 0 0 0 1px var(--hairline);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.swatch input:checked + span { box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--subject); }
.swatch input:focus-visible + span { outline: 2px solid var(--focus); outline-offset: 5px; }

/* Toasts */
.toast-region {
  position: fixed; left: 50%; transform: translateX(-50%); z-index: 60;
  bottom: calc(var(--tabbar-h) + var(--space-4) + env(safe-area-inset-bottom));
  display: grid; gap: var(--space-2); width: min(420px, calc(100vw - 2 * var(--space-4)));
  pointer-events: none;
}
@media (min-width: 900px) { .toast-region { bottom: var(--space-6); left: calc(50% + var(--sidebar-w) / 2); } }
.toast {
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-pill);
  background: var(--text); color: var(--accent-contrast);
  font-size: 0.9375rem; font-weight: 500; text-align: center;
  box-shadow: var(--shadow-toast);
  animation: toast-in var(--dur) var(--ease) both;
}
.toast.leaving { animation: toast-out 200ms var(--ease) both; }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } }
@keyframes toast-out { to { opacity: 0; transform: translateY(8px); } }

/* Small screens */
@media (max-width: 520px) {
  .page-head { align-items: stretch; }
  .head-actions { width: 100%; }
  .head-actions .btn-primary { flex: 1; }
  .subject-grid { grid-template-columns: 1fr 1fr; gap: var(--space-3); }
  .subject-card, .add-card { min-height: 128px; padding: var(--space-4); }
  .subject-card h3 { font-size: 1.4rem; }
  .note-row { padding: var(--space-4); }
  .stats { grid-template-columns: 1fr 1fr; }
}

/* ===================================================================
   Stage 2+ components
   =================================================================== */

/* Small additions to base pieces */
.btn-small { min-height: 36px; padding: 0 var(--space-4); font-size: 0.875rem; }
.btn-small.btn-icon { width: 36px; }
.btn-wide { width: 100%; }
.btn-gold { background: var(--gold-deep); border-color: var(--gold-deep); color: var(--accent-contrast); }
.btn-gold:hover { background: var(--gold-deeper); color: var(--accent-contrast); }
.btn[aria-disabled="true"] { opacity: 0.5; pointer-events: none; }
kbd {
  display: inline-grid; place-items: center; min-width: 22px; height: 22px; padding: 0 5px;
  border: 1px solid currentColor; border-radius: 6px; opacity: 0.6;
  font-family: var(--font-body); font-size: 0.6875rem; font-weight: 600;
}
code { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.92em; }
.chip {
  display: inline-flex; align-items: center; gap: var(--space-1);
  padding: 2px 10px; border-radius: var(--radius-pill);
  background: var(--surface-sunken); border: 1px solid var(--border);
  font-size: 0.75rem; font-weight: 600; color: var(--text-muted);
}
.chip .icon { width: 14px; height: 14px; }
.gold-text { color: var(--gold-text); }
.ok-text { color: var(--success); font-weight: 600; }
.bad-text { color: var(--danger); font-weight: 600; }
.link-btn { padding: 0; border: 0; background: none; color: var(--accent); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; }
.textarea-short { min-height: 96px !important; }
.label-row { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); }
.upload-btn { cursor: pointer; }
.upload-btn:focus-within { outline: 2px solid var(--focus); outline-offset: 2px; }
label.btn:focus-within { outline: 2px solid var(--focus); outline-offset: 2px; }
.check-row {
  display: flex; gap: var(--space-3); align-items: flex-start; margin-top: var(--space-5);
  padding: var(--space-4); border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface-sunken); cursor: pointer;
}
.check-row input { margin-top: 4px; width: 18px; height: 18px; accent-color: var(--accent); flex-shrink: 0; }
.check-row strong { display: block; font-size: 0.9375rem; }
.check-row span span { display: block; font-size: 0.875rem; color: var(--text-muted); }
.sheet-wide { width: min(720px, calc(100vw - 2 * var(--space-4))); }
.sheet-foot-left { margin-right: auto; }
.model-options { border: 0; margin: 0; padding: 0; }
.stats { grid-template-columns: repeat(3, 1fr); }
.spinner {
  display: inline-block; width: 14px; height: 14px; flex-shrink: 0; margin-top: 4px;
  border: 2px solid var(--border-strong); border-top-color: var(--accent); border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Progress bars */
.bar { height: 6px; border-radius: var(--radius-pill); background: var(--surface-sunken); overflow: hidden; }
.bar > span { display: block; height: 100%; border-radius: inherit; background: var(--accent); transition: width 300ms var(--ease); }
.bar-gold > span { background: var(--gold); }
.bar-live > span { background: linear-gradient(90deg, var(--accent) 0%, var(--focus) 50%, var(--accent) 100%); background-size: 200% 100%; animation: shimmer 1.4s linear infinite; }

/* Loading skeleton */
.skeleton { display: grid; gap: var(--space-3); }
.skeleton span {
  display: block; height: 12px; border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--surface-sunken) 0%, var(--bg-deep) 50%, var(--surface-sunken) 100%);
  background-size: 200% 100%; animation: shimmer 1.4s ease-in-out infinite;
}
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }
.loading-note { margin-top: var(--space-4); }

/* Library extras */
.due-pill { color: var(--gold-text); font-weight: 600; }
.quick-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: var(--space-3); margin-bottom: var(--space-5); }
.quick {
  display: flex; align-items: center; gap: var(--space-3); min-height: 56px; padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface);
  color: var(--text); text-decoration: none; font-size: 0.9375rem; font-weight: 500;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.quick:hover { border-color: var(--gold); color: var(--text); }
.quick .icon { color: var(--accent); }
.note-row .when { display: flex; align-items: center; gap: var(--space-3); }
.ready { display: inline-flex; align-items: center; gap: 4px; color: var(--success); font-weight: 600; }
.ready .icon { width: 14px; height: 14px; }

/* Generate panel */
.gen-panel { padding: var(--space-5); margin-bottom: var(--space-5); }
.gen-intro { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-4); border-color: var(--gold-soft); background: linear-gradient(180deg, var(--surface) 0%, var(--gold-wash) 100%); }
.gen-intro h2, .gen-head h2 { font-size: 1.5rem; }
.gen-intro p { margin-top: var(--space-1); color: var(--text-muted); max-width: 54ch; font-size: 0.9375rem; }
.gen-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-4); }
.gen-badge { display: inline-flex; align-items: center; gap: var(--space-2); font-size: 0.875rem; font-weight: 600; color: var(--text-muted); }
.gen-badge .spinner { margin: 0; }
.gen-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-3); }
@media (min-width: 700px) { .gen-steps { grid-template-columns: 1fr 1fr; column-gap: var(--space-6); } }
.gen-step-head { display: flex; justify-content: space-between; gap: var(--space-3); margin-bottom: 6px; font-size: 0.875rem; }
.gen-name { display: inline-flex; align-items: center; gap: var(--space-2); font-weight: 600; }
.gen-name .icon { width: 16px; height: 16px; }
.gen-step[data-state="done"] .gen-name .icon { color: var(--success); }
.gen-step[data-state="error"] .gen-name .icon { color: var(--danger); }
.gen-dot { width: 8px; height: 8px; margin: 0 4px; border-radius: 50%; background: var(--border-strong); }
.gen-step[data-state="working"] .gen-dot { background: var(--accent); }
.gen-state { color: var(--text-muted); }
.gen-step[data-state="done"] .bar > span { background: var(--success); }
.gen-error { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-top: var(--space-2); font-size: 0.8125rem; color: var(--danger); }
.gen-step[data-state="idle"] .gen-error { color: var(--text-muted); }

/* Tabs */
.tabs {
  display: flex; gap: var(--space-1); margin-bottom: var(--space-5); padding: 4px;
  overflow-x: auto; scrollbar-width: none;
  background: var(--surface-sunken); border: 1px solid var(--border); border-radius: var(--radius-pill);
}
.tabs::-webkit-scrollbar { display: none; }
.tabs button {
  flex: 0 0 auto; min-height: 40px; padding: 0 var(--space-4);
  border: 0; border-radius: var(--radius-pill); background: transparent; cursor: pointer;
  font-size: 0.875rem; font-weight: 600; color: var(--text-muted); white-space: nowrap;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.tabs button:hover { color: var(--text); }
.tabs button[aria-selected="true"] { background: var(--surface); color: var(--text); box-shadow: var(--shadow-tab); }
.tabs button.is-empty { color: var(--text-faint); }

/* Clean notes */
.clean-notes section + section { margin-top: var(--space-6); }
.clean-notes h3, .summary h3 { font-family: var(--font-display); font-size: 1.5rem; font-weight: 600; margin-bottom: var(--space-3); }
.clean-notes ul, .summary ul { margin: 0; padding-left: 1.2em; display: grid; gap: var(--space-2); }
.clean-notes li::marker, .summary li::marker { color: var(--gold); }
.clean-notes strong, .summary strong { color: var(--accent); }
.formula-box {
  margin-bottom: var(--space-6); padding: var(--space-4) var(--space-5);
  border: 1px solid var(--gold-soft); border-left: 3px solid var(--gold); border-radius: var(--radius-sm); background: var(--gold-wash);
}
.formula-box h3 { font-family: var(--font-body) !important; font-size: 0.75rem !important; letter-spacing: 0.14em; text-transform: uppercase; color: var(--gold-text); margin-bottom: var(--space-3) !important; }
.formula-box ul { list-style: none; padding: 0 !important; }
.formula-box li { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-2) var(--space-3); }
.formula-box li span { font-size: 0.875rem; color: var(--text-muted); min-width: 120px; }
.formula-box code { font-size: 1rem; color: var(--text); overflow-wrap: anywhere; }
.terms dl { margin: 0; display: grid; gap: var(--space-3); }
.terms dl div { display: grid; gap: 2px; padding-bottom: var(--space-3); border-bottom: 1px solid var(--border); }
.terms dl div:last-child { border-bottom: 0; padding-bottom: 0; }
.terms dt { font-weight: 600; }
.terms dd { margin: 0; color: var(--text-muted); }
.summary li { font-size: 1.0625rem; }

/* Flashcard list */
.tab-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-4); }
.card-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-3); }
.flash-row { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-3); padding: var(--space-4) var(--space-5); box-shadow: none; }
.flash-front { font-weight: 600; overflow-wrap: anywhere; }
.flash-back { margin-top: var(--space-1); color: var(--text-muted); font-size: 0.9375rem; overflow-wrap: anywhere; }
.row-actions { display: flex; align-items: center; gap: var(--space-1); flex-shrink: 0; }

.launch { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-4); }
.launch h2 { font-size: 1.6rem; }
.launch p { color: var(--text-muted); margin-top: var(--space-1); }
.exam-preview { margin: var(--space-4) 0 0; padding-left: 1.4em; display: grid; gap: var(--space-3); }
.exam-preview li { padding-left: var(--space-1); }
.exam-preview li::marker { color: var(--gold-text); font-weight: 600; }
.exam-preview li > span:first-child { display: block; }
.marks { font-size: 0.8125rem; font-weight: 600; color: var(--gold-text); white-space: nowrap; }

/* Diagrams */
.diagram { display: block; width: 100%; height: auto; font-family: var(--font-body); }
.d-grid { stroke: var(--border); stroke-width: 0.6; }
.d-axis { stroke: var(--text); stroke-width: 1.2; }
.d-arrowhead { fill: var(--text); }
.d-tick { font-size: 9px; fill: var(--text-muted); }
.d-axis-label { font-size: 11px; font-style: italic; fill: var(--text); }
.d-curve { fill: none; stroke: var(--accent); stroke-width: 2.2; stroke-linejoin: round; stroke-linecap: round; }
.d-curve-1 { stroke: var(--subject-burgundy); }
.d-curve-2 { stroke: var(--subject-sage); }
.d-point { fill: var(--gold); stroke: var(--surface); stroke-width: 1.5; }
.d-label { font-size: 11px; font-weight: 600; fill: var(--text); }
.d-halo { paint-order: stroke; stroke: var(--surface); stroke-width: 3px; stroke-linejoin: round; }
.d-shape { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 2; stroke-linejoin: round; }
.d-thin { fill: none; stroke: var(--text-muted); stroke-width: 1.2; }

/* Study hub */
.due-hero {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-5);
  padding: var(--space-5) var(--space-6);
  background: linear-gradient(135deg, var(--surface) 40%, var(--gold-wash) 100%); border-color: var(--gold-soft);
}
.due-hero > div { display: flex; align-items: center; gap: var(--space-5); }
.due-number { font-family: var(--font-display); font-size: 4rem; font-weight: 600; line-height: 1; color: var(--accent); font-variant-numeric: tabular-nums; }
.due-hero h2 { font-size: 1.6rem; }
.due-hero p { color: var(--text-muted); margin-top: var(--space-1); max-width: 40ch; }
.subject-study-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-4); }
.subject-study { padding: var(--space-5); border-top: 3px solid var(--subject); }
.ss-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-4); }
.ss-head h3 { display: flex; align-items: center; gap: var(--space-2); font-family: var(--font-display); font-size: 1.5rem; }
.spark { display: flex; align-items: flex-end; gap: 4px; height: 44px; }
.spark span { flex: 1; max-width: 18px; border-radius: 3px 3px 0 0; background: var(--subject); opacity: 0.75; }
.spark span.exam { opacity: 0.45; }
.ss-meta { margin-top: var(--space-2); font-size: 0.8125rem; color: var(--text-muted); }
.ss-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }

/* Sessions */
.session-head { align-items: center; margin-bottom: var(--space-4); }
.session-count { font-size: 0.9375rem; font-weight: 600; color: var(--text-muted); font-variant-numeric: tabular-nums; }
.session-bar { margin-bottom: var(--space-6); }

.flashcard { perspective: 1400px; cursor: pointer; outline: none; touch-action: pan-y; transition: transform 200ms var(--ease); }
.flashcard:focus-visible .face { outline: 2px solid var(--focus); outline-offset: 3px; }
.flashcard-inner { position: relative; min-height: 300px; transform-style: preserve-3d; transition: transform 500ms var(--ease); }
.flashcard.is-flipped .flashcard-inner { transform: rotateY(180deg); }
.face {
  position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--space-4);
  padding: var(--space-6) var(--space-5); text-align: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
  backface-visibility: hidden; -webkit-backface-visibility: hidden; overflow-wrap: anywhere;
}
.face p { font-size: clamp(1.125rem, 1rem + 0.8vw, 1.5rem); line-height: 1.45; max-width: 36ch; }
.face.back { transform: rotateY(180deg); background: linear-gradient(180deg, var(--surface) 0%, var(--gold-wash) 100%); }
.face-label { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--gold-text); }
.review-controls { margin-top: var(--space-5); }
.ratings { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-2); }
.rating { flex-direction: column; gap: 2px; min-height: 64px; padding: var(--space-2); border-radius: var(--radius-sm); }
.rating strong { font-size: 0.9375rem; }
.rating span { font-size: 0.75rem; font-weight: 500; color: var(--text-muted); }
.rating kbd { display: none; }
.rating-again { border-color: var(--danger-line); }
.rating-again strong { color: var(--danger); }
.rating-good { border-color: var(--accent); }
.rating-easy strong { color: var(--success); }
.review-tools { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-2); margin-top: var(--space-4); }
.show-touch { display: none; }
@media (hover: none) and (pointer: coarse) { .show-touch { display: inline; } .hide-touch { display: none; } }
@media (hover: hover) { .rating kbd { display: inline-grid; margin-top: 2px; } }
.finish .finish-actions, .result .finish-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-2); margin-top: var(--space-4); }
.result .finish-actions { justify-content: flex-start; margin-top: var(--space-6); }
.empty-mark.gold { background: var(--gold); color: var(--accent-contrast); }

.quiz-card .chip { margin-bottom: var(--space-3); }
.quiz-q { font-family: var(--font-body); font-size: clamp(1.125rem, 1rem + 0.6vw, 1.375rem); font-weight: 600; line-height: 1.45; letter-spacing: 0; margin-bottom: var(--space-5); overflow-wrap: anywhere; }
.options { display: grid; gap: var(--space-2); }
.option {
  display: flex; align-items: center; gap: var(--space-3); width: 100%; min-height: 56px; padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: var(--surface);
  text-align: left; cursor: pointer; font-size: 1rem; overflow-wrap: anywhere;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.option:hover:not(:disabled) { border-color: var(--accent); background: var(--accent-soft); }
.option:disabled { cursor: default; }
.option.is-correct { border-color: var(--success); background: var(--success-soft); }
.option.is-wrong { border-color: var(--danger); background: var(--danger-soft); }
.option kbd { flex-shrink: 0; }
#feedback > .btn { margin-top: var(--space-4); }
.feedback { margin-top: var(--space-5); padding: var(--space-4); border-radius: var(--radius-sm); background: var(--surface-sunken); border-left: 3px solid var(--border-strong); }
.feedback.ok { background: var(--success-soft); border-left-color: var(--success); }
.feedback.bad { background: var(--danger-soft); border-left-color: var(--danger); }
.feedback.mid { background: var(--gold-wash); border-left-color: var(--gold); }
.feedback strong { display: block; margin-bottom: var(--space-1); }
.feedback p + p { margin-top: var(--space-1); }
.m-label { font-weight: 600; }
.exam-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-3); }
.exam-meta .chip { margin: 0; }
.quiz-card .textarea { min-height: 160px; }
.exam-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: var(--space-2); margin-top: var(--space-3); }
.model { margin-top: var(--space-3); border: 1px solid var(--border); border-radius: var(--radius-sm); }
.model summary { padding: var(--space-3) var(--space-4); cursor: pointer; font-weight: 600; min-height: 44px; }
.model > div { padding: 0 var(--space-4) var(--space-4); }
.model ul, .model ol, .msg-body ul, .msg-body ol { padding-left: 1.2em; margin: var(--space-2) 0; }
.model p + p, .msg-body p + p { margin-top: var(--space-2); }

.result-score { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-4); margin-bottom: var(--space-5); color: var(--text-muted); }
.result-score .big { font-family: var(--font-display); font-size: 4rem; font-weight: 600; line-height: 1; color: var(--text); font-variant-numeric: tabular-nums; }
.result-score small { font-size: 0.5em; color: var(--text-muted); }
.result h3 { font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--gold-text); margin-bottom: var(--space-3); }
.mistakes { list-style: none; margin: 0; padding: 0; display: grid; }
.mistakes li { padding: var(--space-3) 0; border-top: 1px solid var(--border); }
.m-q { font-weight: 600; overflow-wrap: anywhere; }
.m-a { display: flex; flex-wrap: wrap; gap: var(--space-1) var(--space-4); margin-top: var(--space-1); font-size: 0.9375rem; }
.m-e { margin-top: var(--space-1); font-size: 0.875rem; color: var(--text-muted); }

/* Tutor */
.tutor { display: grid; gap: var(--space-4); }
@media (min-width: 1100px) { .tutor { grid-template-columns: 280px minmax(0, 1fr); align-items: start; } .tutor-controls { position: sticky; top: var(--space-6); } }
.tutor-controls { padding: var(--space-4) var(--space-5); display: grid; gap: var(--space-4); box-shadow: none; }
.tutor-controls .field + .field { margin: 0; }
.note-picker summary { cursor: pointer; font-size: 0.875rem; color: var(--text-muted); min-height: 32px; display: flex; align-items: center; }
.note-picker summary::before { content: "▸"; margin-right: var(--space-2); font-size: 0.75rem; transition: transform var(--dur) var(--ease); }
.note-picker[open] summary::before { transform: rotate(90deg); }
#scope-label { margin-left: 0.3em; font-weight: 600; color: var(--text); }
#note-checks { display: grid; gap: var(--space-1); max-height: 200px; overflow-y: auto; padding: var(--space-2) 0 0; }
.check-line { display: flex; align-items: center; gap: var(--space-2); min-height: 36px; font-size: 0.9375rem; cursor: pointer; overflow-wrap: anywhere; }
.check-line input { width: 17px; height: 17px; accent-color: var(--accent); flex-shrink: 0; }
.modes { display: flex; flex-wrap: wrap; gap: var(--space-2); }
@media (min-width: 1100px) { .modes { flex-direction: column; } }
.mode {
  min-height: 40px; padding: 0 var(--space-4); border: 1px solid var(--border-strong); border-radius: var(--radius-pill);
  background: var(--surface); font-size: 0.875rem; font-weight: 600; color: var(--text-muted); cursor: pointer; text-align: left;
  transition: all var(--dur) var(--ease);
}
.mode:hover { color: var(--text); }
.mode[aria-checked="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); }
.chat { display: flex; flex-direction: column; height: calc(100dvh - 300px); min-height: 440px; overflow: hidden; }
@media (min-width: 900px) { .chat { height: calc(100dvh - 220px); } }
.messages { list-style: none; margin: 0; padding: var(--space-5); flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: var(--space-4); }
.msg { display: flex; }
.msg-user { justify-content: flex-end; }
.msg-body { max-width: min(88%, 640px); padding: var(--space-3) var(--space-4); border-radius: var(--radius); font-size: 0.9375rem; overflow-wrap: anywhere; }
.msg-user .msg-body { background: var(--accent); color: var(--accent-contrast); border-bottom-right-radius: 6px; }
.msg-user .chip { background: var(--on-accent-tint); border-color: transparent; color: inherit; margin-bottom: var(--space-1); }
.msg-tutor .msg-body { background: var(--surface-sunken); border: 1px solid var(--border); border-bottom-left-radius: 6px; }
.msg-tutor .msg-body h4 { margin: var(--space-2) 0 var(--space-1); font-size: 0.9375rem; }
.msg-tutor strong { color: var(--accent); }
.msg-tutor .skeleton { min-width: 220px; }
.not-in-notes { display: flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-2); font-size: 0.8125rem; font-weight: 600; color: var(--gold-text); }
.not-in-notes .icon { width: 16px; height: 16px; }
.sources { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); margin-top: var(--space-3) !important; font-size: 0.8125rem; color: var(--text-muted); }
.msg-clear { display: flex; justify-content: center; }
.chat-empty { margin: auto; text-align: center; max-width: 40ch; color: var(--text-muted); }
.chat-empty h2 { color: var(--text); margin-bottom: var(--space-2); font-size: 1.75rem; }
.composer { border-top: 1px solid var(--border); padding: var(--space-3); background: var(--surface); }
.composer-row { display: flex; align-items: flex-end; gap: var(--space-2); }
.composer-input {
  flex: 1; min-width: 0; min-height: 44px; max-height: 180px; padding: 10px var(--space-4); resize: none;
  border: 1px solid var(--border-strong); border-radius: 22px; background: var(--surface); font-size: 1rem; line-height: 1.45;
}
.composer-input:focus { outline: none; border-color: var(--focus); box-shadow: 0 0 0 3px var(--accent-soft); }
.composer-input::placeholder { color: var(--text-faint); }
.attach-preview { display: flex; align-items: center; gap: var(--space-3); padding: 0 var(--space-2) var(--space-3); }
.attach-preview img { width: 64px; height: 64px; object-fit: cover; border-radius: var(--radius-sm); border: 1px solid var(--border); }

/* Planner */
.progress-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.stat-card { padding: var(--space-4) var(--space-5); display: flex; flex-direction: column; gap: var(--space-2); box-shadow: none; }
.stat-label { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-muted); }
.gold-num, .num { font-family: var(--font-display); font-size: 2.6rem; font-weight: 600; line-height: 1; font-variant-numeric: tabular-nums; }
.gold-num { color: var(--gold-text); }
.gold-num small, .num small { font-family: var(--font-body); font-size: 0.9rem; font-weight: 500; color: var(--text-muted); }
.stat-sub { font-size: 0.8125rem; color: var(--text-muted); }
.level-card { border-color: var(--gold-soft); background: linear-gradient(180deg, var(--surface) 0%, var(--gold-wash) 100%); }
.week-bars { display: flex; align-items: flex-end; gap: 6px; height: 46px; margin-top: auto; }
.week-bars span { flex: 1; height: 100%; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; gap: 3px; }
.week-bars i { display: block; width: 100%; max-width: 16px; min-height: 3px; border-radius: 3px; background: var(--accent-soft); }
.week-bars i.today { background: var(--gold); }
.week-bars b { font-size: 0.625rem; font-weight: 600; color: var(--text-muted); }
.planner-grid { display: grid; gap: 0 var(--space-6); }
@media (min-width: 1100px) { .planner-grid { grid-template-columns: minmax(0, 1fr) 300px; } }
.exam-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-3); }
.exam-card { display: flex; align-items: center; gap: var(--space-4); padding: var(--space-4) var(--space-5); box-shadow: none; border-left: 3px solid var(--subject); }
.countdown { display: grid; justify-items: center; min-width: 64px; }
.countdown strong { font-family: var(--font-display); font-size: 2.25rem; font-weight: 600; line-height: 1; color: var(--accent); font-variant-numeric: tabular-nums; }
.countdown span { font-size: 0.6875rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; text-align: center; }
.exam-info { flex: 1; min-width: 0; }
.exam-info h3 { overflow-wrap: anywhere; }
.exam-info p { display: flex; align-items: center; gap: var(--space-2); font-size: 0.875rem; color: var(--text-muted); }
.past-note { margin-top: var(--space-3); }
.plan-day + .plan-day { margin-top: var(--space-5); }
.plan-day h3 { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: var(--space-2); font-size: 0.9375rem; }
.task-list { list-style: none; margin: 0; padding: 0; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); }
.task { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); padding: var(--space-2) var(--space-4); border-left: 3px solid var(--subject); }
.task + .task { border-top: 1px solid var(--border); }
.task:first-child { border-top-left-radius: var(--radius-sm); }
.task:last-child { border-bottom-left-radius: var(--radius-sm); }
.task label { display: flex; align-items: center; gap: var(--space-3); min-height: 44px; flex: 1; cursor: pointer; }
.task input { width: 18px; height: 18px; accent-color: var(--gold-deep); flex-shrink: 0; }
.task input:disabled + .task-text { color: var(--text-muted); }
.task-text { font-size: 0.9375rem; overflow-wrap: anywhere; }
.task.is-done .task-text { text-decoration: line-through; color: var(--text-muted); }
.weak-list, .avg-list { list-style: none; margin: 0; padding: var(--space-2) var(--space-4); box-shadow: none; }
.weak-list li, .avg-list li { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); min-height: 44px; font-size: 0.9375rem; }
.weak-list li + li, .avg-list li + li { border-top: 1px solid var(--border); }
.weak-list li > span:first-child, .avg-list li > span:first-child { display: flex; align-items: center; gap: var(--space-2); min-width: 0; overflow-wrap: anywhere; }
.avg-list li > span:first-child { flex: 0 0 38%; }
.avg-bar { flex: 1; height: 6px; border-radius: var(--radius-pill); background: var(--surface-sunken); overflow: hidden; }
.avg-bar i { display: block; height: 100%; background: var(--subject); }
.avg-list strong { min-width: 3ch; text-align: right; font-variant-numeric: tabular-nums; }
.muted-panel { box-shadow: none; background: var(--surface-sunken); }
.muted-panel p { color: var(--text-muted); font-size: 0.9375rem; }
.planner-grid .panel { padding: var(--space-4) var(--space-5); }

/* Nav badges and progress */
.nav-badge {
  margin-left: auto; min-width: 22px; height: 22px; padding: 0 6px; border-radius: var(--radius-pill);
  display: inline-grid; place-items: center; background: var(--gold-soft); color: var(--gold-text); font-size: 0.75rem; font-weight: 700;
}
.nav-badge[hidden] { display: none; }
.tabbar a { position: relative; }
.tabbar .nav-badge { position: absolute; top: 6px; left: calc(50% + 6px); min-width: 18px; height: 18px; font-size: 0.625rem; padding: 0 4px; }
.progress-badge { display: inline-flex; align-items: center; gap: var(--space-3); font-size: 0.8125rem; font-weight: 600; color: var(--gold-text); }
.progress-badge[hidden] { display: none; }
.pb-streak { display: inline-flex; align-items: center; gap: 2px; }
.pb-streak .icon { width: 16px; height: 16px; }
.topbar { justify-content: space-between; }
.sidebar-foot { display: grid; gap: var(--space-3); }
.sidebar-foot p { margin: 0; }

/* Note page tweaks */
.source-hint { margin-top: var(--space-2); }
.note-bar .btn-small { min-height: 36px; }

/* Printing anything other than the book: hide the app chrome */
@media print {
  .sidebar, .tabbar, .topbar, .toast-region, .no-print, .skip-link { display: none !important; }
  .view { margin: 0 !important; padding: 0 !important; max-width: none; }
  .js-motion .reveal { opacity: 1 !important; transform: none !important; }
}

/* Small screens */
@media (max-width: 760px) {
  .progress-strip { grid-template-columns: 1fr 1fr; }
  .progress-strip .stat-card:last-child { grid-column: 1 / -1; }
}
@media (max-width: 520px) {
  .due-hero { padding: var(--space-5); }
  .due-hero .btn { width: 100%; }
  .due-number { font-size: 3.25rem; }
  .ratings { grid-template-columns: repeat(2, 1fr); }
  .flashcard-inner { min-height: 260px; }
  .gen-intro .btn, .launch .btn { width: 100%; }
  .quick-row { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: 1fr 1fr 1fr; gap: var(--space-2); }
  .stat strong { font-size: 1.6rem; }
  .exam-card { padding: var(--space-3) var(--space-4); gap: var(--space-3); }
  .countdown { min-width: 52px; }
  .flash-row { padding: var(--space-3) var(--space-4); }
  .messages { padding: var(--space-4); }
  .chat { height: calc(100dvh - 330px); min-height: 400px; }
  .tutor-controls { padding: var(--space-4); }
  .result-score .big { font-size: 3.25rem; }
  .print-toolbar { flex-wrap: wrap; }
  .exam-actions .btn { flex: 1; }
}

/* Numbers: Inter with tabular figures reads better than the display serif's old-style digits */
.due-number, .gold-num, .num, .countdown strong, .result-score .big, .stat strong {
  font-family: var(--font-body); font-weight: 600; letter-spacing: -0.03em;
}

/* Tutor on phones and tablets: compact controls so the chat stays in view */
@media (max-width: 1099px) {
  .tutor-controls { grid-template-columns: 1fr auto; align-items: end; gap: var(--space-3); padding: var(--space-3) var(--space-4); }
  .tutor-controls .field { gap: 4px; }
  .tutor-controls .field .label { font-size: 0.75rem; }
  .tutor-controls .select { min-height: 44px; padding-top: 8px; padding-bottom: 8px; }
  .note-picker { align-self: center; }
  .note-picker summary { min-height: 44px; }
  .note-picker[open] { grid-column: 1 / -1; }
  .modes { grid-column: 1 / -1; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; margin: 0 calc(var(--space-4) * -1); padding: 0 var(--space-4); }
  .modes::-webkit-scrollbar { display: none; }
  .mode { flex: 0 0 auto; white-space: nowrap; }
}
@media (max-width: 520px) {
  .tutor-head { margin-bottom: var(--space-4); }
  .chat { height: calc(100dvh - 450px - env(safe-area-inset-bottom)); min-height: 340px; }
}

/* Extra diagram parts */
.d-strong { font-weight: 700; }
.d-small { font-size: 9.5px; fill: var(--text-muted); }
.d-box { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.4; }
.d-node { fill: var(--surface); stroke: var(--accent); stroke-width: 1.6; }
.d-ring { fill: none; stroke: var(--border-strong); stroke-width: 1.6; }
.d-arrow-line { stroke: var(--text-muted); stroke-width: 1.4; fill: none; }
.d-bar { fill: var(--accent); }

/* ===================================================================
   Reference Book
   =================================================================== */
:root {
  --sheet-w: 210mm;
  --sheet-h: 297mm;
  --sheet-pad: 13mm;
  --ink: #15171c;
  --ink-soft: #4a505c;
  --rule: #d9d3c6;
}
.book-search { margin-bottom: var(--space-2); }
.search-count { margin-bottom: var(--space-4); }
.book { display: grid; gap: var(--space-6); justify-items: center; }
.book > * { width: 100%; }
.book-measure { position: fixed; left: -10000px; top: 0; width: var(--sheet-w); visibility: hidden; pointer-events: none; }

/* Contents (screen) */
.contents-card { padding: var(--space-5); max-width: var(--sheet-w); }
.contents-head { display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-3); }
.contents-head h2 { font-size: 1.6rem; }
.toc { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.toc-item { display: flex; align-items: center; gap: var(--space-2); min-height: 48px; padding: 0 var(--space-1); border-radius: var(--radius-sm); }
.toc-item + .toc-item { border-top: 1px solid var(--border); }
.toc-item.dragging { opacity: 0.5; background: var(--surface-sunken); }
.toc-item.dim { opacity: 0.4; }
.toc-grip { cursor: grab; color: var(--text-faint); font-size: 0.75rem; letter-spacing: -2px; padding: 0 var(--space-1); user-select: none; }
.toc-item a { color: var(--text); text-decoration: none; font-weight: 500; overflow-wrap: anywhere; }
.toc-item a:hover { color: var(--accent); }
.toc-dots { flex: 1; min-width: 16px; border-bottom: 1px dotted var(--border-strong); transform: translateY(-4px); }
.toc-num { font-variant-numeric: tabular-nums; color: var(--gold-text); font-weight: 600; min-width: 2ch; text-align: right; }
.toc-move { display: inline-flex; }
@media (hover: hover) and (pointer: fine) { .toc-move { opacity: 0; transition: opacity var(--dur) var(--ease); } .toc-item:hover .toc-move, .toc-move:focus-within { opacity: 1; } }

/* Sheet tools above each page */
.sheet-wrap { width: 100%; max-width: var(--sheet-w); scroll-margin-top: var(--space-6); }
.sheet-wrap[hidden] { display: none; }
.sheet-tools { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); margin-bottom: var(--space-2); font-size: 0.875rem; }
.sheet-tools .spacer { flex: 1; }
.sheet-num { font-weight: 600; color: var(--text-muted); }
.sheet-error, .sheet-overflow, .sheet-busy { display: inline-flex; align-items: center; gap: var(--space-2); }
.sheet-error, .sheet-overflow { color: var(--danger); font-weight: 500; }
.sheet-overflow[hidden] { display: none; }
.sheet-error .icon, .sheet-overflow .icon { width: 16px; height: 16px; }

/* The sheet itself: white paper, ink text */
.book-sheet {
  --text: var(--ink); --text-muted: var(--ink-soft); --border: var(--rule); --surface: var(--paper);
  display: flex; flex-direction: column;
  background: var(--paper); color: var(--ink);
  border: 1px solid var(--border); border-radius: 4px; box-shadow: var(--shadow);
  padding: 8mm 7mm; font-size: 10.5pt; line-height: 1.4;
}
.book-sheet.paper { width: var(--sheet-w); height: var(--sheet-h); padding: var(--sheet-pad); overflow: hidden; }
.pg-head, .pg-foot { display: flex; justify-content: space-between; gap: var(--space-3); font-size: 8pt; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); }
.pg-head { padding-bottom: 2.5mm; border-bottom: 0.6pt solid var(--rule); margin-bottom: 4mm; }
.pg-foot { padding-top: 2.5mm; border-top: 0.6pt solid var(--rule); margin-top: 4mm; text-transform: none; letter-spacing: 0; font-size: 8.5pt; }
.pg-foot span:last-child { font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; }
.pg-body { flex: 1; min-height: 0; overflow: hidden; }
.book-sheet:not(.paper) .pg-body { overflow: visible; }
.pg-title { font-family: var(--font-display); font-size: 22pt; font-weight: 600; line-height: 1.1; margin-bottom: 2mm; overflow-wrap: anywhere; }
.pg-title .part { font-family: var(--font-body); font-size: 10pt; font-weight: 600; color: var(--gold-text); letter-spacing: 0.04em; vertical-align: middle; margin-left: 2mm; }
.missing { display: flex; flex-wrap: wrap; gap: 1.5mm; margin: 0 0 3mm; }
.tag-missing { display: inline-flex; align-items: center; gap: 4px; padding: 1px 8px; border-radius: 999px; border: 0.6pt dashed var(--danger); color: var(--danger); font-size: 8pt; font-weight: 600; }
.tag-missing .icon { width: 11px; height: 11px; }
.pg-cols { columns: 2; column-gap: 7mm; margin-top: 3mm; }
.book-sheet:not(.paper) .pg-cols { columns: 1; }
@container (min-width: 560px) { .book-sheet:not(.paper) .pg-cols { columns: 2; } }
.book { container-type: inline-size; }
.sb { break-inside: avoid; margin: 0 0 4mm; }
.sb h4 { font-size: 7.5pt; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--gold-text); margin: 0 0 1.5mm; }
.sb ul, .sb ol { margin: 0; padding-left: 1.15em; display: grid; gap: 1mm; }
.sb li::marker { color: var(--gold); }
.sb ol li::marker { color: var(--ink); font-weight: 700; }
.sb p { margin: 0 0 1mm; }
.sb strong { color: var(--accent); }
.sb.formula { padding: 2.5mm 3mm; border-left: 2pt solid var(--gold); background: var(--gold-wash); border-radius: 2px; }
.sb.formula ul { list-style: none; padding: 0; }
.sb.formula li { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0 2.5mm; }
.f-name { font-size: 8.5pt; color: var(--ink-soft); }
.sb.formula code { font-size: 10.5pt; color: var(--ink); }
.units { font-size: 8.5pt; color: var(--ink-soft); }
.units::before { content: "units: "; }
.missing-units { color: var(--danger); font-style: italic; }
.missing-units::before { content: ""; }
.sb.fig { margin: 0 0 4mm; padding: 2mm; border: 0.6pt solid var(--rule); border-radius: 3px; }
.sb.fig .diagram { max-height: 62mm; }
.sb.fig figcaption { font-size: 8pt; color: var(--ink-soft); text-align: center; margin-top: 1mm; }
.terms-dl { margin: 0; display: grid; gap: 1.2mm; }
.terms-dl div { display: grid; grid-template-columns: minmax(0, 32%) 1fr; gap: 2mm; }
.terms-dl dt { font-weight: 700; overflow-wrap: anywhere; }
.terms-dl dd { margin: 0; overflow-wrap: anywhere; }
.defs { width: 100%; border-collapse: collapse; font-size: 9.5pt; }
.defs th, .defs td { text-align: left; vertical-align: top; padding: 1.2mm 1.5mm; border-bottom: 0.5pt solid var(--rule); }
.defs th { width: 34%; font-weight: 700; }
.sb.cas ol { list-style: none; padding: 0; }
.cas-step { display: block; font-size: 8.5pt; color: var(--ink-soft); }
.sb.cas kbd { display: block; height: auto; min-width: 0; padding: 1.2mm 2mm; opacity: 1; border: 0.6pt solid var(--ink-soft); border-radius: 3px; font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 9pt; font-weight: 500; text-align: left; overflow-wrap: anywhere; }
.sb.cas kbd.unsure { border-style: dashed; color: var(--gold-text); }
.sb.practical { padding: 2.5mm 3mm; border: 0.6pt solid var(--rule); border-radius: 3px; }
.themes { list-style: none; padding: 0 !important; display: flex !important; flex-wrap: wrap; gap: 1.5mm !important; }
.themes li { padding: 0.5mm 2.5mm; border: 0.6pt solid var(--rule); border-radius: 999px; font-size: 9pt; }
.sb.teel p b { display: inline-grid; place-items: center; width: 5mm; height: 5mm; margin-right: 1.5mm; border-radius: 50%; background: var(--ink); color: var(--paper); font-size: 7.5pt; }
.sb.ce { display: grid; grid-template-columns: 1fr 1fr; gap: 3mm; }
.sb.wide { column-span: all; }
.quotes { width: 100%; border-collapse: collapse; font-size: 9.5pt; }
.quotes th { text-align: left; font-size: 7.5pt; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); padding: 1mm 1.5mm; border-bottom: 0.8pt solid var(--ink); }
.quotes td { vertical-align: top; padding: 1.5mm; border-bottom: 0.5pt solid var(--rule); }
.quotes td:first-child { font-style: italic; width: 44%; }
.example { padding: 3mm; background: var(--surface-sunken); border-radius: 3px; }
.ex-title { font-weight: 700; }
.ex-line { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 9.5pt; overflow-wrap: anywhere; }
.ex-answer { margin-top: 1.5mm !important; padding-top: 1.5mm; border-top: 0.6pt dashed var(--rule); font-weight: 700; color: var(--accent); }
.tip { padding: 2mm 3mm; border: 0.8pt solid var(--gold); border-radius: 3px; }
.tip h4 { color: var(--gold-text); }

/* Inline editing */
.ed { border-radius: 2px; outline: none; transition: background-color var(--dur) var(--ease); }
.ed:hover { background: var(--accent-soft); }
.ed:focus { background: var(--gold-wash); box-shadow: 0 0 0 1.5px var(--focus); }

/* Contents sheet: only when printing */
.print-only { display: none !important; }
.contents-sheet .pg-title { font-size: 30pt; margin-top: 20mm; }
.contents-sub { color: var(--ink-soft); margin-bottom: 14mm; }
.contents-sheet h3 { font-size: 8pt; letter-spacing: 0.14em; text-transform: uppercase; color: var(--gold-text); margin-bottom: 4mm; }
.toc-print { list-style: none; margin: 0; padding: 0; counter-reset: c; display: grid; gap: 3mm; font-size: 11.5pt; }
.toc-print li { display: flex; align-items: baseline; gap: 2mm; }
.toc-print li::before { counter-increment: c; content: counter(c) "."; min-width: 6mm; color: var(--gold-text); font-weight: 700; }

/* Reference style picker in the subject sheet */
.kind-options { display: grid; gap: var(--space-2); border: 0; margin: 0; padding: 0; }
.kind-options .radio-card { padding: var(--space-3) var(--space-4); }

/* Reference book card on a note */
.ref-card { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-4); padding: var(--space-5); margin-bottom: var(--space-5); box-shadow: none; }
.ref-card h2 { font-size: 1.5rem; }
.ref-card p { color: var(--text-muted); font-size: 0.9375rem; margin-top: var(--space-1); max-width: 54ch; }
.ref-card .head-actions { flex-shrink: 0; }

/* Review sheet */
.rv-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-3); }
.rv-item { padding: var(--space-3) var(--space-4); border: 1px solid var(--border); border-radius: var(--radius-sm); }
.rv-item label { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); cursor: pointer; min-height: 32px; }
.rv-item input { width: 18px; height: 18px; accent-color: var(--accent); }
.rv-same { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); background: var(--surface-sunken); }
.rv-badge { font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; padding: 2px 8px; border-radius: 999px; background: var(--surface-sunken); color: var(--text-muted); }
.rv-badge.new { background: var(--success-soft); color: var(--success); }
.rv-badge.upd { background: var(--gold-wash); color: var(--gold-text); }
.rv-adds { margin: var(--space-2) 0 0 30px; padding: 0; list-style: none; display: grid; gap: 4px; font-size: 0.875rem; color: var(--text-muted); }
.rv-adds li.plus { color: var(--success); }
.rv-adds li.plus::before { content: "+ "; font-weight: 700; }
.rv-adds li.plus span { font-weight: 600; margin-right: 6px; }
.rv-adds .more { font-style: italic; }
.rv-fail { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-3); padding: var(--space-3) var(--space-4); border-radius: var(--radius-sm); background: var(--danger-soft); color: var(--danger); font-size: 0.875rem; }
.rv-fail span { display: inline-flex; align-items: center; gap: var(--space-2); }

body.book-mode .view { max-width: calc(var(--content-max) + 40px); }

/* Printing: sheets only, black on white, one topic per A4 */
html.printing body { background: var(--paper); }
html.printing .sidebar, html.printing .tabbar, html.printing .topbar, html.printing .toast-region, html.printing .no-print, html.printing .skip-link { display: none !important; }
html.printing .view { margin: 0 !important; padding: 0 !important; max-width: none !important; }
html.printing .book { display: block; }
html.printing .print-only { display: flex !important; }
html.printing .sheet-wrap { display: block !important; max-width: none; }
html.printing .book-sheet {
  --ink: #000; --ink-soft: #333; --rule: #bbb; --gold-text: #000; --gold: #555; --gold-wash: #fff; --accent: #000; --surface-sunken: #f2f2f2; --accent-soft: #eee; --danger: #000;
  width: var(--sheet-w); height: var(--sheet-h); padding: var(--sheet-pad); margin: 0; border: 0; border-radius: 0; box-shadow: none; overflow: hidden;
  break-after: page; page-break-after: always;
}
html.printing .book-sheet .pg-cols { columns: 2; }
html.printing .ed { background: none !important; box-shadow: none !important; }
html.printing .d-curve, html.printing .d-bar { stroke: #000; }
html.printing .d-bar, html.printing .d-point { fill: #000; }
html.printing .d-shape, html.printing .d-box { fill: #f2f2f2; stroke: #000; }
@media print {
  @page { size: A4; margin: 0; }
  .book-sheet { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}