/* Sami's Interview Prep — 2026 — App-shell redesign */

:root {
  /* === Dark theme (default) === */
  --bg: #0b0e14;
  --bg-elev: #11151c;
  --bg-card: #161b25;
  --bg-hover: #1c2230;
  --border: #232a36;
  --border-soft: rgba(255,255,255,.06);
  --text: #e2e6ef;
  --text-dim: #98a1b3;
  --text-mute: #6a7384;
  --accent: #d4a373;
  --accent-2: #7aa6c4;
  --accent-glow: rgba(212,163,115,.25);
  --good: #7fb069;
  --warn: #e09f3e;
  --bad:  #c95d5d;
  --code-bg: #0d1117;
  --code-border: #1f2630;
  --topbar-bg: rgba(11, 14, 20, 0.78);
  --sidebar-bg: rgba(15, 19, 27, 0.92);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow:    0 4px 16px rgba(0,0,0,.32), 0 1px 0 rgba(255,255,255,.03) inset;
  --shadow-lg: 0 18px 48px rgba(0,0,0,.55), 0 1px 0 rgba(255,255,255,.04) inset;
  --shadow-hover: 0 12px 32px rgba(0,0,0,.45), 0 0 0 1px var(--accent-glow);
  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 14px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  --ease: cubic-bezier(.2,.7,.2,1);
  --topbar-h: 56px;
  --sidebar-w: 264px;
}

[data-theme="light"] {
  --bg: #f7f6f2;
  --bg-elev: #ffffff;
  --bg-card: #ffffff;
  --bg-hover: #f0ece4;
  --border: #e5e1d8;
  --border-soft: rgba(0,0,0,.06);
  --text: #1a1d22;
  --text-dim: #5b6371;
  --text-mute: #8a93a3;
  --accent: #a87444;
  --accent-2: #4d7a96;
  --accent-glow: rgba(168,116,68,.18);
  --good: #5e8b4a;
  --warn: #b8762a;
  --bad:  #b34646;
  --code-bg: #f1eee5;
  --code-border: #e0dbcc;
  --topbar-bg: rgba(247, 246, 242, 0.82);
  --sidebar-bg: rgba(255, 255, 255, 0.92);
  --shadow-sm: 0 1px 2px rgba(20,18,12,.06);
  --shadow:    0 6px 18px rgba(20,18,12,.06), 0 1px 0 rgba(0,0,0,.02) inset;
  --shadow-lg: 0 20px 50px rgba(20,18,12,.12);
  --shadow-hover: 0 14px 32px rgba(20,18,12,.12), 0 0 0 1px var(--accent-glow);
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", sans-serif;
  font-size: 16px; line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .25s var(--ease), color .25s var(--ease);
}

body { min-height: 100vh; }

/* Smooth scroll for anchors */
html { scroll-behavior: smooth; scroll-padding-top: 140px; }

a { color: var(--accent-2); text-decoration: none; transition: color .15s var(--ease); }
a:hover { color: var(--accent); text-decoration: underline; }

::selection { background: var(--accent-glow); color: var(--text); }

/* ===========================================================
   APP SHELL
   =========================================================== */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  grid-template-areas:
    "topbar topbar"
    "sidebar main";
  min-height: 100vh;
}

/* === TOPBAR === */
.app-topbar {
  grid-area: topbar;
  position: sticky; top: 0;
  height: var(--topbar-h);
  background: var(--topbar-bg);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--border-soft);
  z-index: 90;
  display: flex; align-items: center;
  padding: 0 20px;
  gap: 16px;
}
.app-topbar .brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 14px; letter-spacing: .2px;
  color: var(--text); white-space: nowrap;
}
.app-topbar .brand .brand-dot {
  width: 22px; height: 22px; border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 18px var(--accent-glow);
  display: inline-flex; align-items: center; justify-content: center;
  color: #0b0e14; font-weight: 800; font-size: 12px;
}
.app-topbar .brand .brand-sub {
  color: var(--text-mute); font-weight: 500; font-size: 12px;
  margin-left: 4px;
}

.app-topbar .search-wrap {
  flex: 1; max-width: 520px; margin: 0 auto;
  position: relative;
}
.app-topbar .search {
  width: 100%; height: 36px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 10px; padding: 0 12px 0 36px;
  color: var(--text-dim); font: inherit; font-size: 13.5px;
  cursor: text;
  display: flex; align-items: center;
  transition: all .15s var(--ease);
}
.app-topbar .search:hover { border-color: var(--accent); color: var(--text); }
.app-topbar .search .ico {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 14px; height: 14px; color: var(--text-mute);
  pointer-events: none;
}
.app-topbar .search .kbd-hint {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  display: flex; gap: 3px;
}

.app-topbar .actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.app-topbar .icon-btn {
  width: 34px; height: 34px;
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent; border: 1px solid transparent;
  color: var(--text-dim);
  border-radius: 9px; cursor: pointer;
  transition: all .15s var(--ease);
}
.app-topbar .icon-btn:hover { background: var(--bg-card); border-color: var(--border); color: var(--accent); }
.app-topbar .icon-btn svg { width: 16px; height: 16px; }
.app-topbar .profile {
  width: 32px; height: 32px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0e14; font-weight: 700; font-size: 12px;
  display: inline-flex; align-items: center; justify-content: center;
  margin-left: 4px;
}
.app-topbar .hamburger { display: none; }

/* === SIDEBAR === */
.app-sidebar {
  grid-area: sidebar;
  background: var(--sidebar-bg);
  backdrop-filter: blur(10px);
  border-right: 1px solid var(--border-soft);
  position: sticky; top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  padding: 16px 12px 32px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.app-sidebar::-webkit-scrollbar { width: 8px; }
.app-sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.sidebar-filter {
  position: sticky; top: 0; z-index: 2;
  background: var(--sidebar-bg); padding: 4px 4px 10px;
  margin-bottom: 4px;
}
.sidebar-filter input {
  width: 100%; height: 32px; padding: 0 10px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font: inherit; font-size: 13px;
  transition: border-color .15s var(--ease);
}
.sidebar-filter input:focus { outline: none; border-color: var(--accent); }
.sidebar-filter input::placeholder { color: var(--text-mute); }

.nav-section { margin-bottom: 4px; }
.nav-section-header {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 10px; margin: 4px 0 2px;
  color: var(--text-mute); font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1.2px;
  cursor: pointer; user-select: none;
  border-radius: 6px;
  transition: color .15s var(--ease);
}
.nav-section-header:hover { color: var(--text-dim); }
.nav-section-header .chev {
  width: 10px; height: 10px;
  transition: transform .2s var(--ease);
  opacity: .6;
}
.nav-section.collapsed .chev { transform: rotate(-90deg); }
.nav-section-header .sec-progress {
  margin-left: auto; font-size: 10px; color: var(--text-mute);
  font-weight: 600; letter-spacing: .3px;
  text-transform: none;
}
.nav-section-header .sec-progress.has { color: var(--good); }

.nav-section-body {
  display: flex; flex-direction: column; gap: 1px;
  overflow: hidden;
  max-height: 1200px;
  transition: max-height .3s var(--ease), opacity .2s var(--ease);
  opacity: 1;
}
.nav-section.collapsed .nav-section-body { max-height: 0; opacity: 0; }

.app-sidebar nav a {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 10px;
  border-radius: 7px;
  color: var(--text-dim);
  font-size: 13.5px;
  position: relative;
  transition: background .15s var(--ease), color .15s var(--ease);
}
.app-sidebar nav a:hover {
  background: var(--bg-card); color: var(--text); text-decoration: none;
}
.app-sidebar nav a.active {
  background: var(--bg-card); color: var(--accent);
  box-shadow: inset 2px 0 0 var(--accent);
}
.app-sidebar nav a .ico { font-size: 13px; opacity: .8; width: 16px; flex-shrink: 0; }
.app-sidebar nav a.hidden-by-filter { display: none; }
.app-sidebar nav .nav-empty {
  padding: 10px; color: var(--text-mute); font-size: 12px; text-align: center;
}

/* ===========================================================
   MAIN
   =========================================================== */
main {
  grid-area: main;
  padding: var(--space-12) var(--space-16);
  max-width: 1100px;
  width: 100%;
  animation: page-fade-in .35s var(--ease);
}

@keyframes page-fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

main h1 { font-size: 32px; margin: 0 0 var(--space-2); letter-spacing: -.3px; font-weight: 700; }
main h2 { font-size: 22px; margin: var(--space-8) 0 var(--space-3); padding-bottom: var(--space-2); border-bottom: 1px solid var(--border-soft); font-weight: 650; }
main h3 { font-size: 17px; margin: var(--space-6) 0 var(--space-2); color: var(--accent); font-weight: 600; }
main h4 { font-size: 15px; margin: var(--space-4) 0 var(--space-2); color: var(--accent-2); }
main p { color: var(--text); }
main ul, main ol { padding-left: 22px; }
main li { margin: 4px 0; }
main blockquote { border-left: 3px solid var(--accent); padding: 6px 16px; color: var(--text-dim); margin: var(--space-3) 0; background: var(--accent-glow); border-radius: 0 8px 8px 0; }

.lede { color: var(--text-dim); font-size: 17px; margin: var(--space-1) 0 var(--space-6); line-height: 1.6; }

/* ===========================================================
   STICKY CHAPTER INDICATOR
   =========================================================== */
.chapter-indicator {
  position: sticky;
  top: calc(var(--topbar-h) + 44px); /* sits below the legacy page topbar */
  z-index: 70;
  background: var(--topbar-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
  margin: 0 calc(-1 * var(--space-16)) var(--space-6);
  padding: 10px var(--space-16);
  display: flex; align-items: center; gap: 14px;
  font-size: 13px;
  cursor: pointer;
  transition: background .15s var(--ease);
}
.chapter-indicator:hover { background: var(--bg-elev); }
.chapter-indicator .chip {
  font-size: 10px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow); padding: 2px 8px; border-radius: 4px;
}
.chapter-indicator .ch-title {
  color: var(--text); font-weight: 600; flex: 1;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.chapter-indicator .ch-progress {
  flex: 0 0 140px; height: 4px; background: var(--bg-card);
  border-radius: 2px; overflow: hidden;
}
.chapter-indicator .ch-progress-fill {
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--good));
  transition: width .25s var(--ease); width: 0%;
}
.chapter-indicator .ch-pct { font-size: 11px; color: var(--text-mute); min-width: 32px; text-align: right; }
.chapter-indicator .ch-outline {
  font-size: 11px; color: var(--text-mute);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 3px 8px;
}

/* Outline popover */
.outline-popover {
  position: fixed;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: var(--shadow-lg);
  padding: 8px; min-width: 280px; max-height: 60vh; overflow-y: auto;
  z-index: 95;
  animation: pop-in .15s var(--ease);
}
.outline-popover a {
  display: block; padding: 6px 10px; border-radius: 6px;
  color: var(--text-dim); font-size: 13px;
}
.outline-popover a:hover { background: var(--bg-card); color: var(--accent); text-decoration: none; }
.outline-popover a.current { background: var(--bg-card); color: var(--accent); }
@keyframes pop-in { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: translateY(0); } }

/* ===========================================================
   COMMAND PALETTE
   =========================================================== */
.cmd-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex; align-items: flex-start; justify-content: center;
  padding-top: 12vh;
  opacity: 0; pointer-events: none;
  transition: opacity .15s var(--ease);
}
.cmd-backdrop.open { opacity: 1; pointer-events: auto; }

.cmd-palette {
  width: min(640px, 92vw);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex; flex-direction: column;
  max-height: 70vh;
  transform: translateY(-8px) scale(.98);
  transition: transform .2s var(--ease);
}
.cmd-backdrop.open .cmd-palette { transform: translateY(0) scale(1); }

.cmd-input-wrap {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-soft);
}
.cmd-input-wrap .ico { color: var(--text-mute); flex-shrink: 0; }
.cmd-input {
  flex: 1; background: transparent; border: none; outline: none;
  color: var(--text); font: inherit; font-size: 16px;
}
.cmd-input::placeholder { color: var(--text-mute); }
.cmd-input-wrap .esc {
  color: var(--text-mute); font-size: 11px;
}

.cmd-results { overflow-y: auto; padding: 6px; }
.cmd-group-label {
  padding: 8px 12px 4px; font-size: 10px; font-weight: 700;
  color: var(--text-mute); text-transform: uppercase; letter-spacing: 1.2px;
}
.cmd-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: 8px;
  cursor: pointer; color: var(--text-dim);
  font-size: 14px;
  transition: background .08s var(--ease);
}
.cmd-item:hover, .cmd-item.active {
  background: var(--bg-card); color: var(--text);
}
.cmd-item .ico { font-size: 14px; opacity: .8; width: 18px; }
.cmd-item .title { flex: 1; }
.cmd-item .title mark { background: var(--accent-glow); color: var(--accent); padding: 0 2px; border-radius: 2px; }
.cmd-item .sub { color: var(--text-mute); font-size: 12px; }
.cmd-item .enter-hint { opacity: 0; transition: opacity .1s; }
.cmd-item.active .enter-hint { opacity: 1; }

.cmd-empty {
  padding: 28px; text-align: center; color: var(--text-mute); font-size: 13px;
}

.cmd-footer {
  display: flex; gap: 14px;
  padding: 8px 14px;
  border-top: 1px solid var(--border-soft);
  font-size: 11px; color: var(--text-mute);
}
.cmd-footer span { display: inline-flex; gap: 4px; align-items: center; }

.kbd, .kbd-mini {
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  background: var(--bg-card); border: 1px solid var(--border);
  border-bottom-width: 2px;
  color: var(--text-dim);
  padding: 1px 5px; border-radius: 4px;
  font-size: 11px;
}
.kbd-mini { font-size: 10px; padding: 0 4px; }

/* ===========================================================
   DASHBOARD (index.html)
   =========================================================== */
.dash-hero {
  position: relative;
  border-radius: var(--radius-lg);
  padding: var(--space-12) var(--space-12) var(--space-8);
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 0%, var(--accent-glow) 0%, transparent 50%),
    radial-gradient(circle at 80% 100%, rgba(122,166,196,.18) 0%, transparent 55%),
    linear-gradient(135deg, var(--bg-elev), var(--bg-card));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  margin-bottom: var(--space-8);
}
.dash-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(1px 1px at 12% 20%, var(--text-mute) 0, transparent 100%),
    radial-gradient(1px 1px at 25% 70%, var(--accent) 0, transparent 100%),
    radial-gradient(1px 1px at 70% 40%, var(--accent-2) 0, transparent 100%),
    radial-gradient(1px 1px at 88% 80%, var(--text-mute) 0, transparent 100%),
    radial-gradient(1px 1px at 55% 12%, var(--accent-2) 0, transparent 100%),
    radial-gradient(1px 1px at 40% 90%, var(--accent) 0, transparent 100%);
  opacity: .35;
  animation: drift 30s linear infinite;
  pointer-events: none;
}
@keyframes drift {
  from { transform: translateY(0); }
  to   { transform: translateY(-20px); }
}
.dash-hero .kicker {
  color: var(--accent); font-size: 11px; font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase; margin-bottom: 8px;
  position: relative; z-index: 1;
}
.dash-hero h1 {
  font-size: 42px; line-height: 1.1; margin: 0 0 12px;
  letter-spacing: -.6px;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative; z-index: 1;
}
.dash-hero .sub {
  color: var(--text-dim); font-size: 17px; max-width: 720px;
  line-height: 1.55; margin: 0;
  position: relative; z-index: 1;
}

/* Quick actions row */
.quick-actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}
.quick-action {
  display: flex; flex-direction: column; gap: 4px;
  padding: var(--space-4) var(--space-4);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer; text-align: left;
  color: var(--text); font: inherit;
  transition: all .18s var(--ease);
  text-decoration: none;
}
.quick-action:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
  text-decoration: none;
}
.quick-action .qa-ico {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--accent-glow); color: var(--accent);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 16px; margin-bottom: 6px;
}
.quick-action .qa-title { font-weight: 600; font-size: 14px; color: var(--text); }
.quick-action .qa-sub  { font-size: 12px; color: var(--text-mute); }
@media (max-width: 880px) { .quick-actions { grid-template-columns: repeat(2, 1fr); } }

/* Progress overview */
.dash-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); margin-bottom: var(--space-8); }
@media (max-width: 880px) { .dash-row { grid-template-columns: 1fr; } }

.panel {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}
.panel-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: var(--space-4);
}
.panel-title { font-size: 14px; font-weight: 700; color: var(--text); margin: 0; letter-spacing: .2px; }
.panel-meta  { font-size: 12px; color: var(--text-mute); }

.pillar-bars { display: flex; flex-direction: column; gap: 10px; }
.pillar-bar { display: grid; grid-template-columns: 130px 1fr 44px; gap: 10px; align-items: center; font-size: 13px; }
.pillar-bar .lbl { color: var(--text-dim); white-space: nowrap; }
.pillar-bar .track { background: var(--bg-elev); height: 8px; border-radius: 4px; overflow: hidden; }
.pillar-bar .fill {
  height: 100%; background: linear-gradient(90deg, var(--accent-2), var(--accent));
  border-radius: 4px;
  transition: width .6s var(--ease);
  width: 0%;
}
.pillar-bar.empty .fill { background: var(--border); }
.pillar-bar .pct { font-size: 11px; color: var(--text-mute); text-align: right; }

.recently-list { display: flex; flex-direction: column; gap: 2px; }
.recently-list a {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 7px;
  color: var(--text-dim); font-size: 13.5px;
  transition: all .12s var(--ease);
}
.recently-list a:hover { background: var(--bg-elev); color: var(--accent); text-decoration: none; }
.recently-list a .when { margin-left: auto; font-size: 11px; color: var(--text-mute); }
.recently-list .empty { color: var(--text-mute); font-size: 13px; padding: 8px 10px; }

/* Pillar cards */
.section-label {
  font-size: 11px; font-weight: 700; color: var(--accent);
  text-transform: uppercase; letter-spacing: 1.5px;
  margin: var(--space-8) 0 var(--space-3);
}

.pillar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
  margin: var(--space-3) 0 var(--space-8);
}
.pillar-card {
  position: relative;
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-6);
  color: var(--text); text-decoration: none;
  overflow: hidden;
  transition: all .22s var(--ease);
  box-shadow: var(--shadow-sm);
}
.pillar-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0); transform-origin: left;
  transition: transform .3s var(--ease);
}
.pillar-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
  text-decoration: none;
}
.pillar-card:hover::before { transform: scaleX(1); }
.pillar-card .pc-ico {
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--accent-glow); color: var(--accent);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 17px; margin-bottom: 12px;
}
.pillar-card h3 {
  margin: 0 0 6px; font-size: 16px; color: var(--text);
  font-weight: 650;
}
.pillar-card .pc-meta {
  color: var(--text-mute); font-size: 12px; margin: 0 0 8px;
  letter-spacing: .2px;
}
.pillar-card .pc-desc { font-size: 13.5px; color: var(--text-dim); line-height: 1.55; margin: 0; }
.pillar-card .pc-arrow {
  position: absolute; bottom: 14px; right: 16px;
  color: var(--text-mute); font-size: 14px;
  transition: transform .2s var(--ease), color .15s;
}
.pillar-card:hover .pc-arrow { transform: translateX(4px); color: var(--accent); }

/* ===========================================================
   CARDS / GRID (legacy + new)
   =========================================================== */
.grid { display: grid; gap: var(--space-4); grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); margin: var(--space-4) 0; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: all .18s var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; }
.card .meta { color: var(--text-mute); font-size: 12px; }

/* ===========================================================
   TAGS
   =========================================================== */
.tag {
  display: inline-block; padding: 2px 8px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 999px; font-size: 11px; color: var(--text-dim);
  margin-right: 4px;
}
.tag.s { color: var(--accent); border-color: var(--accent); }
.tag.a { color: var(--good); border-color: var(--good); }
.tag.b { color: var(--accent-2); border-color: var(--accent-2); }
.tag.c { color: var(--text-mute); }
.tag.warn { color: var(--warn); border-color: var(--warn); }
.tag.bad  { color: var(--bad);  border-color: var(--bad); }

/* ===========================================================
   CODE
   =========================================================== */
code {
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 13.5px;
  background: var(--code-bg); border: 1px solid var(--code-border);
  padding: 1px 5px; border-radius: 4px; color: var(--text);
}

pre {
  position: relative;
  background: var(--code-bg); border: 1px solid var(--code-border);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 13px; line-height: 1.55;
  margin: var(--space-3) 0;
}
pre code { background: none; border: none; padding: 0; color: var(--text); }

.pre-wrap { position: relative; }
.pre-lang {
  position: absolute; top: 6px; left: 12px;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 10px; color: var(--text-mute);
  text-transform: uppercase; letter-spacing: 1.2px;
  opacity: .7; pointer-events: none;
}
.pre-copy {
  position: absolute; top: 8px; right: 8px;
  background: var(--bg-card); color: var(--text-dim);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 3px 8px; font-size: 11px;
  cursor: pointer; opacity: 0;
  transition: all .15s var(--ease);
  font-family: inherit;
}
.pre-wrap:hover .pre-copy { opacity: 1; }
.pre-copy:hover { color: var(--accent); border-color: var(--accent); }
.pre-copy.copied { color: var(--good); border-color: var(--good); }

/* ===========================================================
   TABLES
   =========================================================== */
table {
  width: 100%; border-collapse: separate; border-spacing: 0;
  margin: var(--space-3) 0; font-size: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
}
th, td {
  text-align: left; padding: 10px 14px;
  vertical-align: top;
  border-bottom: 1px solid var(--border-soft);
}
th {
  color: var(--text-dim); font-weight: 600;
  background: var(--bg-elev);
  font-size: 12px; text-transform: uppercase; letter-spacing: .5px;
}
tbody tr:nth-child(2n) td { background: rgba(255,255,255,.012); }
tbody tr:hover td { background: var(--bg-hover); }
tbody tr:last-child td { border-bottom: none; }

[data-theme="light"] tbody tr:nth-child(2n) td { background: rgba(0,0,0,.015); }

/* ===========================================================
   CALLOUTS
   =========================================================== */
.callout {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 12px 16px; border-radius: 0 var(--radius) var(--radius) 0;
  margin: var(--space-3) 0;
}
.callout.warn { border-left-color: var(--warn); }
.callout.good { border-left-color: var(--good); }
.callout.bad  { border-left-color: var(--bad); }
.callout .title { font-weight: 700; margin-bottom: 4px; color: var(--accent); }
.callout.warn .title { color: var(--warn); }
.callout.good .title { color: var(--good); }
.callout.bad  .title { color: var(--bad); }

/* ===========================================================
   TIER LIST
   =========================================================== */
.tier-list { display: grid; gap: 12px; margin: var(--space-4) 0; }
.tier-row { display: grid; grid-template-columns: 80px 1fr; gap: 12px; align-items: stretch; }
.tier-label { display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 22px; border-radius: 10px; }
.tier-label.s { background: linear-gradient(135deg, #d4a373, #c0892b); color: #14181f; }
.tier-label.a { background: #7fb069; color: #14181f; }
.tier-label.b { background: #7aa6c4; color: #14181f; }
.tier-label.c { background: var(--bg-card); color: var(--text-dim); border: 1px solid var(--border); }
.tier-companies {
  display: flex; flex-wrap: wrap; gap: 8px;
  padding: 10px; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: 10px;
}
.tier-pill {
  padding: 6px 12px; background: var(--bg-elev);
  border: 1px solid var(--border); border-radius: 6px;
  font-size: 13px; color: var(--text);
  transition: all .15s var(--ease);
}
.tier-pill:hover { border-color: var(--accent); color: var(--accent); }

/* ===========================================================
   CHECKLIST
   =========================================================== */
.checklist { list-style: none; padding-left: 0; }
.checklist li {
  padding: 7px 0 7px 28px; position: relative;
  border-bottom: 1px dashed var(--border);
}
.checklist li::before {
  content: "☐"; position: absolute; left: 0; top: 6px;
  color: var(--text-mute); font-size: 18px;
}

/* ===========================================================
   TWO-COL
   =========================================================== */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6); }

/* ===========================================================
   LEGACY TOPBAR (inside main, page-level) — slimmer, sits under app-topbar.
   Hides redundant home link/crumb; keeps studied-progress + controls.
   =========================================================== */
main > .topbar {
  position: sticky; top: var(--topbar-h);
  z-index: 60;
  background: var(--topbar-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
  padding: 8px var(--space-16);
  display: flex; align-items: center; gap: 12px;
  margin: calc(-1 * var(--space-12)) calc(-1 * var(--space-16)) 0;
  min-height: 44px;
}
main > .topbar a.home { display: none; }
main > .topbar .crumb { color: var(--text-mute); font-size: 12px; }
main > .topbar .crumb .sep { display: none; }
main > .topbar .progress-bar {
  flex: 1; max-width: 200px; height: 6px;
  background: var(--bg-card); border-radius: 3px; overflow: hidden;
  margin-left: auto;
}
main > .topbar .progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--good));
  transition: width .4s var(--ease); width: 0%;
}
main > .topbar .progress-text { font-size: 11px; color: var(--text-mute); margin-left: 8px; min-width: 70px; }
main > .topbar .controls { display: flex; gap: 6px; }
main > .topbar .controls button {
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text-dim);
  padding: 4px 10px; border-radius: 6px; cursor: pointer; font-size: 12px;
  font-family: inherit;
  transition: all .15s var(--ease);
}
main > .topbar .controls button:hover { color: var(--accent); border-color: var(--accent); }

/* ===========================================================
   COLLAPSIBLE CHAPTERS
   =========================================================== */
.chapter {
  cursor: pointer;
  transition: background .15s var(--ease);
  padding: 10px 12px;
  margin-left: -12px;
  border-radius: 8px;
  user-select: none;
  display: flex; align-items: flex-start; gap: 14px;
  margin: var(--space-12) 0 var(--space-4);
  margin-left: -12px;
}
.chapter:hover { background: var(--accent-glow); }
.chapter .num {
  font-size: 36px; font-weight: 800; color: var(--accent);
  line-height: 1; opacity: .9; min-width: 56px;
}
.chapter .meta-block { flex: 1; }
.chapter .label {
  font-size: 11px; color: var(--text-mute);
  letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 4px;
}
.chapter h2 {
  font-size: 24px; margin: 0; padding: 0; border: none;
  letter-spacing: -.2px;
}
.chapter::after {
  content: "▾"; margin-left: auto;
  color: var(--text-mute); font-size: 14px;
  transition: transform .25s var(--ease);
}
.chapter.collapsed::after { transform: rotate(-90deg); }
.chapter-body {
  overflow: hidden;
  transition: max-height .3s var(--ease), opacity .25s var(--ease);
  max-height: none; opacity: 1;
}
.chapter-body.collapsed { max-height: 0 !important; opacity: 0; padding: 0 !important; margin: 0 !important; }

/* Chapter checkbox — animated tick */
.chapter-checkbox {
  width: 22px; height: 22px;
  border: 2px solid var(--border); border-radius: 6px;
  display: inline-flex; align-items: center; justify-content: center;
  margin-right: 12px; flex-shrink: 0;
  cursor: pointer;
  transition: all .18s var(--ease);
  background: var(--bg-card);
  position: relative;
}
.chapter-checkbox:hover { border-color: var(--accent); transform: scale(1.06); }
.chapter-checkbox.done {
  background: var(--good); border-color: var(--good);
  animation: tick-pop .25s var(--ease);
}
.chapter-checkbox.done::after {
  content: "✓"; color: #0b0e14; font-weight: 800; font-size: 14px;
}
@keyframes tick-pop {
  0%   { transform: scale(.7); }
  60%  { transform: scale(1.15); }
  100% { transform: scale(1); }
}
.chapter.done > .meta-block .label::after { content: " · DONE"; color: var(--good); font-weight: 700; }
.toc-card a.done::after { content: " ✓"; color: var(--good); font-weight: 700; }

/* ===========================================================
   PAGE TEMPLATE COMPONENTS (hero, toc, tldr, takeaway, etc)
   =========================================================== */
.hero {
  background: linear-gradient(135deg, var(--accent-glow), rgba(122,166,196,.06));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-8);
  margin: 0 0 var(--space-8);
  box-shadow: var(--shadow-sm);
}
.hero h1 { margin: 0 0 6px; font-size: 32px; letter-spacing: -.4px; }
.hero .kicker {
  color: var(--accent); font-size: 11px; font-weight: 700;
  letter-spacing: 1.8px; text-transform: uppercase; margin-bottom: 10px;
}
.hero .hero-lede {
  color: var(--text-dim); font-size: 17px;
  max-width: 720px; line-height: 1.6;
}
.hero .hero-meta { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.hero .hero-meta .pill {
  background: var(--bg-card); border: 1px solid var(--border);
  padding: 4px 10px; border-radius: 999px;
  font-size: 12px; color: var(--text-dim);
}
.hero .hero-meta .pill strong { color: var(--accent); margin-right: 4px; }

.toc-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-6) var(--space-6);
  margin: 0 0 var(--space-8);
}
.toc-card h3 {
  margin: 0 0 12px; font-size: 12px; color: var(--text-mute);
  letter-spacing: 1.5px; text-transform: uppercase; font-weight: 700;
}
.toc-card ol { columns: 2; column-gap: 28px; padding-left: 20px; margin: 0; }
.toc-card ol li { margin: 4px 0; break-inside: avoid; }
.toc-card a { color: var(--text); font-size: 14px; }
.toc-card a:hover { color: var(--accent); }
@media (max-width: 720px) { .toc-card ol { columns: 1; } }

.section-h { margin: var(--space-8) 0 var(--space-3); font-size: 18px; color: var(--accent); }
.section-h::before { content: "▸ "; opacity: .6; }

.tldr {
  background: linear-gradient(180deg, var(--accent-glow), transparent);
  border-left: 3px solid var(--accent);
  padding: 12px 16px; margin: var(--space-3) 0 var(--space-4);
  border-radius: 0 8px 8px 0;
}
.tldr .tldr-label {
  font-size: 11px; font-weight: 700; color: var(--accent);
  letter-spacing: 1.5px; margin-bottom: 4px;
}
.tldr p { margin: 0; color: var(--text); }

.takeaway {
  background: var(--bg-card); border: 1px solid var(--border);
  border-left: 3px solid var(--good);
  padding: 12px 16px; margin: var(--space-4) 0;
  border-radius: 0 8px 8px 0;
}
.takeaway .label { color: var(--good); font-size: 11px; font-weight: 700; letter-spacing: 1.5px; margin-bottom: 4px; }
.takeaway p { margin: 0; }
.takeaway ul { margin: 4px 0 0; padding-left: 20px; }

.spotlight {
  background: linear-gradient(135deg, var(--accent-glow), rgba(122,166,196,.08));
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px 22px; margin: 18px 0;
}
.spotlight .label { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: 1.5px; margin-bottom: 8px; }
.spotlight h3, .spotlight h4 { margin-top: 0; color: var(--text); }
.spotlight p { color: var(--text); }

.example {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-left: 3px solid var(--accent-2);
  padding: 12px 16px; margin: 12px 0;
  border-radius: 0 8px 8px 0;
}
.example .label { color: var(--accent-2); font-size: 11px; font-weight: 700; letter-spacing: 1.5px; margin-bottom: 4px; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: var(--space-4) 0; }
.compare .col {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 16px;
}
.compare .col h4 { margin: 0 0 8px; color: var(--accent); font-size: 14px; }
.compare .col ul { margin: 0; padding-left: 18px; font-size: 14px; }
@media (max-width: 720px) { .compare { grid-template-columns: 1fr; } }

.triptych { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: var(--space-4) 0; }
.triptych .col {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 16px;
}
.triptych .col h4 { margin: 0 0 8px; color: var(--accent); font-size: 14px; }
@media (max-width: 880px) { .triptych { grid-template-columns: 1fr; } }

.steps { counter-reset: step; padding-left: 0; list-style: none; }
.steps li {
  counter-increment: step;
  padding: 10px 14px 10px 50px; position: relative; margin: 8px 0;
  background: var(--bg-card); border-left: 2px solid var(--accent-2);
  border-radius: 0 8px 8px 0;
}
.steps li::before {
  content: counter(step); position: absolute; left: 12px; top: 10px;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent-2); color: #0b0e14;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px;
}

.why-matters {
  display: inline-block; font-size: 11px;
  padding: 2px 8px; background: var(--bg-elev);
  border: 1px solid var(--border); color: var(--accent);
  border-radius: 4px; margin-right: 6px;
  font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
}

.defn {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 16px; margin: 12px 0;
}
.defn .term { color: var(--accent); font-weight: 700; font-family: "SF Mono", Menlo, monospace; }
.defn p { margin: 4px 0 0; }

.pitfall {
  background: rgba(201,93,93,.06);
  border: 1px solid rgba(201,93,93,.3);
  border-left: 3px solid var(--bad);
  padding: 12px 16px; margin: 12px 0;
  border-radius: 0 8px 8px 0;
}
.pitfall .label { color: var(--bad); font-size: 11px; font-weight: 700; letter-spacing: 1.5px; margin-bottom: 4px; }

.divider { height: 1px; background: linear-gradient(90deg, transparent, var(--border), transparent); margin: var(--space-8) 0; }

.quiz { list-style: none; padding-left: 0; margin: var(--space-3) 0; counter-reset: q; }
.quiz li {
  counter-increment: q;
  padding: 10px 14px; margin: 8px 0;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px;
}
.quiz li::before { content: "Q" counter(q) ". "; color: var(--accent); font-weight: 700; }
.quiz details { margin-top: 8px; }
.quiz summary { cursor: pointer; color: var(--text-dim); font-size: 13px; padding: 4px 0; }
.quiz summary:hover { color: var(--accent); }
.quiz details[open] summary { color: var(--accent); }
.quiz details > p, .quiz details > ul, .quiz details > pre {
  margin: 6px 0 0; padding-left: 12px;
  border-left: 2px solid var(--accent); color: var(--text);
}
.quiz .why { color: var(--text-dim); font-size: 13px; font-style: italic; margin-top: 4px; }

.reading-path {
  background: var(--bg-card); border: 1px solid var(--border);
  border-left: 3px solid var(--accent-2);
  border-radius: 8px; padding: 14px 18px; margin: var(--space-4) 0;
}
.reading-path h3 { margin-top: 0; color: var(--accent-2); }
.reading-path ol { margin: 8px 0; padding-left: 22px; }
.reading-path li { margin: 6px 0; }
.reading-path .level {
  display: inline-block; padding: 1px 6px;
  background: var(--bg-elev); border-radius: 4px;
  font-size: 11px; color: var(--text-mute); margin-right: 6px;
}

.lc-link { font-family: "SF Mono", Menlo, monospace; font-size: 12px; color: var(--accent-2); text-decoration: none; }
.lc-link::before { content: "↗ "; }

.footer { margin: var(--space-16) 0 0; padding: var(--space-6) 0; border-top: 1px solid var(--border); color: var(--text-mute); font-size: 12px; }

/* ===========================================================
   REVEAL ON SCROLL
   =========================================================== */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
  will-change: opacity, transform;
}
.reveal.in {
  opacity: 1; transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ===========================================================
   BUTTONS
   =========================================================== */
button, .btn {
  font: inherit; cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-card); color: var(--text);
  padding: 8px 14px; border-radius: 8px;
  transition: all .15s var(--ease);
}
button:hover, .btn:hover { border-color: var(--accent); color: var(--accent); }
button.primary, .btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0e14; border-color: transparent;
  font-weight: 600;
}
button.primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-hover); color: #0b0e14; }

/* ===========================================================
   RESPONSIVE
   =========================================================== */
.sidebar-scrim { display: none; }

@media (max-width: 880px) {
  :root { --sidebar-w: 0px; }
  html, body { font-size: 15px; line-height: 1.55; }

  .app-shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "topbar"
      "main";
  }
  .app-sidebar {
    position: fixed; top: var(--topbar-h); left: 0;
    width: 280px; max-width: 85vw; height: calc(100vh - var(--topbar-h));
    z-index: 95;
    transform: translateX(-100%);
    transition: transform .25s var(--ease);
    border-right: 1px solid var(--border);
  }
  .app-sidebar.open { transform: translateX(0); box-shadow: var(--shadow-lg); }
  .sidebar-scrim {
    display: block;
    position: fixed; inset: var(--topbar-h) 0 0 0; z-index: 94;
    background: rgba(0,0,0,.4); opacity: 0; pointer-events: none;
    transition: opacity .2s var(--ease);
  }
  .sidebar-scrim.open { opacity: 1; pointer-events: auto; }
  .app-topbar { padding: 0 12px; gap: 8px; }
  .app-topbar .hamburger { display: inline-flex; }
  .app-topbar .search-wrap { display: none; }
  .app-topbar .brand .brand-sub { display: none; }
  .app-topbar .brand span:not(.brand-dot):not(.brand-sub) { font-size: 13px; }
  .app-topbar .actions { gap: 4px; }

  main {
    padding: var(--space-4) var(--space-4) 80px;
    max-width: 100vw;
    overflow-x: hidden;
  }
  main > .topbar, .chapter-indicator {
    padding-left: var(--space-4); padding-right: var(--space-4);
    margin-left: calc(-1 * var(--space-4)); margin-right: calc(-1 * var(--space-4));
  }
  main > .topbar .progress-bar, main > .topbar .progress-text { display: none; }

  /* --- Hero & dashboard --- */
  .dash-hero, .hero { padding: var(--space-5, 20px) var(--space-4); }
  .dash-hero h1, .hero h1 { font-size: 26px; line-height: 1.2; }
  .hero-lede, .dash-hero .sub { font-size: 14.5px; }
  .hero-meta { gap: 6px; }
  .hero-meta .pill { font-size: 11px; padding: 3px 8px; }

  /* --- TOC --- */
  .toc-card { padding: 14px 16px; }
  .toc-card ol { columns: 1; padding-left: 18px; }
  .toc-card a { font-size: 13.5px; }

  /* --- Chapters --- */
  .chapter { padding: 6px 8px; margin-left: -8px; gap: 10px; }
  .chapter .num { font-size: 26px; min-width: 36px; }
  .chapter h2 { font-size: 20px; line-height: 1.25; }
  .chapter .label { font-size: 10px; }
  .section-h { font-size: 16px; }

  /* --- Tables: wrap in scroll, prevent overflow --- */
  main table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    max-width: 100%;
    white-space: normal;
    font-size: 13px;
  }
  main table th, main table td {
    padding: 8px 10px;
    min-width: 100px;
  }
  /* Allow long words / code in cells to wrap */
  main table td code { word-break: break-word; }

  /* --- Code blocks: ensure horizontal scroll, no layout break --- */
  pre {
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 12.5px;
    padding: 10px 12px;
    border-radius: 6px;
  }
  pre code { white-space: pre; }
  /* Inline code wraps if too long */
  p code, li code, td code { word-break: break-word; overflow-wrap: anywhere; }

  /* --- Block-level callouts adapt --- */
  .tldr, .takeaway, .spotlight, .example, .pitfall, .defn {
    padding: 10px 14px;
    margin: 12px 0;
  }
  .spotlight { padding: 14px 16px; }

  /* --- Comparison cards stack --- */
  .compare, .triptych, .two-col { grid-template-columns: 1fr; gap: 10px; }
  .compare .col, .triptych .col { padding: 12px 14px; }

  /* --- Grid cards adapt --- */
  .grid, .pillar-grid { grid-template-columns: 1fr; gap: 12px; }
  .pillar-card { padding: 16px; }

  /* --- Quiz items --- */
  .quiz li { padding: 10px 12px; font-size: 14px; }

  /* --- Lists tighter on mobile --- */
  main ul, main ol { padding-left: 20px; }
  main li { font-size: 14.5px; }

  /* --- Steps --- */
  .steps li { padding-left: 44px; padding-right: 12px; }
  .steps li::before { left: 10px; width: 24px; height: 24px; font-size: 12px; }

  /* --- Reading path --- */
  .reading-path { padding: 12px 14px; }
  .reading-path ol { padding-left: 18px; }

  /* --- Drop the heaviest margins --- */
  .divider { margin: 24px 0; }
  h2 { font-size: 22px; margin-top: 28px; }
}

/* Very small phones */
@media (max-width: 420px) {
  .dash-hero h1, .hero h1 { font-size: 22px; }
  .chapter .num { font-size: 22px; min-width: 30px; }
  .chapter h2 { font-size: 17px; }
  .app-topbar .brand span:not(.brand-dot):not(.brand-sub) { font-size: 12px; }
  .app-topbar .profile { width: 28px; height: 28px; font-size: 11px; }
  pre { font-size: 11.5px; padding: 8px 10px; }
}

/* === QUICK-STUDY FLOATING ACTION BUTTON === */
.qs-fab {
  position: fixed;
  bottom: 20px; right: 20px;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0e14;
  border: none;
  font-size: 24px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0,0,0,.4), 0 0 0 4px rgba(212,163,115,.12);
  z-index: 80;
  display: flex; align-items: center; justify-content: center;
  transition: transform .15s var(--ease), box-shadow .15s var(--ease);
}
.qs-fab:hover, .qs-fab:focus {
  transform: scale(1.06);
  box-shadow: 0 10px 28px rgba(0,0,0,.5), 0 0 0 6px rgba(212,163,115,.18);
  outline: none;
}
.qs-fab:active { transform: scale(.96); }
.qs-fab .qs-fab-label {
  position: absolute;
  right: 64px;
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transform: translateX(10px);
  transition: all .2s var(--ease);
}
.qs-fab:hover .qs-fab-label { opacity: 1; transform: translateX(0); }
@media (max-width: 880px) {
  .qs-fab { bottom: 16px; right: 16px; width: 52px; height: 52px; font-size: 22px; }
  .qs-fab .qs-fab-label { display: none; }
}
/* Hide FAB on flashcards page itself */
body[data-page="flashcards"] .qs-fab { display: none; }

/* === QUICK-STUDY MODAL === */
.qs-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(6px);
  z-index: 150;
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
  animation: qs-fade .2s ease;
}
@keyframes qs-fade { from { opacity: 0; } to { opacity: 1; } }
.qs-modal {
  width: min(440px, 100%);
  max-height: 92vh;
  display: flex; flex-direction: column;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 24px 64px rgba(0,0,0,.6);
  overflow: hidden;
}
.qs-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.qs-head h3 { margin: 0; font-size: 15px; color: var(--text); }
.qs-head .qs-deck {
  font-size: 11px; padding: 3px 8px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 999px; color: var(--text-dim);
  margin-left: 8px;
}
.qs-head .qs-close {
  background: transparent; border: none; color: var(--text-mute);
  cursor: pointer; font-size: 18px; padding: 4px 8px;
  border-radius: 6px;
}
.qs-head .qs-close:hover { color: var(--accent); background: var(--bg-card); }
.qs-card {
  flex: 1;
  padding: 24px 20px;
  display: flex; flex-direction: column; justify-content: center;
  min-height: 220px; max-height: 60vh;
  overflow-y: auto;
  cursor: pointer;
  text-align: left;
  position: relative;
  background: linear-gradient(180deg, rgba(212,163,115,.04), transparent);
}
.qs-card .qs-side-label {
  font-size: 10px; color: var(--accent);
  font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase;
  margin-bottom: 10px;
}
.qs-card .qs-side-label.back-label { color: var(--good); }
.qs-card .qs-front, .qs-card .qs-back { font-size: 15.5px; line-height: 1.55; color: var(--text); }
.qs-card .qs-back { display: none; }
.qs-card.flipped .qs-front { display: none; }
.qs-card.flipped .qs-back { display: block; }
.qs-card .qs-tap-hint {
  position: absolute; bottom: 8px; left: 0; right: 0;
  text-align: center; font-size: 11px; color: var(--text-mute);
  pointer-events: none;
}
.qs-foot {
  display: flex; gap: 6px;
  padding: 12px 14px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}
.qs-foot button {
  flex: 1;
  padding: 12px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  font: inherit; font-size: 13px; font-weight: 600;
  cursor: pointer;
  transition: all .15s var(--ease);
}
.qs-foot button:hover { border-color: var(--accent); color: var(--accent); }
.qs-foot .qs-rate-hard { color: var(--bad); }
.qs-foot .qs-rate-med { color: var(--warn); }
.qs-foot .qs-rate-easy { color: var(--good); }
.qs-foot .qs-skip { flex: 0 0 auto; padding: 12px 14px; color: var(--text-dim); }
.qs-foot.flipped .qs-flip-btn { display: none; }
.qs-foot:not(.flipped) .qs-rate-hard,
.qs-foot:not(.flipped) .qs-rate-med,
.qs-foot:not(.flipped) .qs-rate-easy { display: none; }
.qs-foot .qs-flip-btn { flex: 1; }
.qs-meta {
  padding: 8px 16px;
  font-size: 11px; color: var(--text-mute);
  border-top: 1px solid var(--border);
  display: flex; justify-content: space-between;
}
.qs-meta .qs-kbd { font-family: "SF Mono", Menlo, monospace; opacity: .7; }
@media (max-width: 880px) {
  .qs-modal { max-height: 96vh; }
  .qs-card { padding: 18px 16px; min-height: 180px; }
  .qs-card .qs-front, .qs-card .qs-back { font-size: 15px; }
  .qs-foot button { padding: 14px 8px; font-size: 13px; }
  .qs-meta { font-size: 10px; }
}

/* Legacy container fallback (in case any page hasn't been migrated yet) */
.container { display: flex; min-height: 100vh; }
.container > .sidebar {
  width: var(--sidebar-w); flex: 0 0 var(--sidebar-w);
  background: var(--bg-elev); border-right: 1px solid var(--border-soft);
  padding: 16px 12px; position: sticky; top: 0; height: 100vh; overflow-y: auto;
}