/* ==========================================================================
   310S Study Hub — stylesheet
   Clean, professional exam-prep visual system.
   ========================================================================== */

:root {
  /* Clean neutral dark with gold as highlight only */
  --bg: #101114;
  --bg-elev: #191b20;
  --bg-elev-2: #21242a;
  --border: #2e3138;
  --text: #e8eaed;
  --text-dim: #9ba0a8;
  --muted: #6b7078;
  --accent: #d0a050;          /* brand gold — used sparingly */
  --accent-2: #e0b868;        /* lighter gold for hover / emphasis */
  --accent-deep: #8c6a2f;     /* darker gold for gradient ends */
  --silver: #9ea0a0;          /* logo gray */
  --good: #5cb85c;
  --bad: #d9534f;
  --info: #9ba0a8;
  --radius: 10px;
  --radius-sm: 8px;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.22);
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

/* ---------- Light mode overrides ---------- */
[data-theme="light"] {
  --bg: #f4f5f7;
  --bg-elev: #ffffff;
  --bg-elev-2: #ebedf0;
  --border: #d1d5db;
  --text: #1a1c20;
  --text-dim: #4b5058;
  --muted: #7a7f88;
  --accent: #9e7a3c;
  --accent-2: #7a5c22;
  --accent-deep: #5c4318;
  --silver: #6e7070;
  --good: #2e8b2e;
  --bad: #c0392b;
  --info: #4b5058;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.07);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.15s ease;
}

[data-theme="light"] body {
  background: var(--bg);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { font-weight: 700; letter-spacing: -0.01em; margin: 0 0 0.4em; }
h1 { font-size: clamp(1.8rem, 2.5vw + 1rem, 3rem); }
h2 { font-size: 1.6rem; margin-top: 1em; }
h3 { font-size: 1.2rem; color: var(--text); }

p { color: var(--text-dim); }

/* ---------- Layout ---------- */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

.nav {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(1.4) blur(10px);
  background: rgba(16, 17, 20, 0.8);
  border-bottom: 1px solid var(--border);
  transition: background 0.25s ease;
}
[data-theme="light"] .nav {
  background: rgba(244, 245, 247, 0.85);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px;
  padding: 14px 24px; max-width: 1100px; margin: 0 auto;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; letter-spacing: -0.02em; color: var(--text);
}
.logo-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-2), var(--accent-deep));
  color: #1a1814; font-weight: 900; font-size: 0.85rem;
  box-shadow: 0 6px 14px rgba(208,160,96,.35);
  letter-spacing: -0.03em;
}
/* ---------- Trade switcher ---------- */
.trade-switcher {
  position: relative;
  margin-left: 4px;
}
.trade-switcher-btn {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-size: 0.82rem; font-weight: 600;
  padding: 5px 10px; cursor: pointer; transition: border-color .15s;
}
.trade-switcher-btn:hover { border-color: var(--accent); }
.trade-active-badge {
  color: var(--accent); font-weight: 700;
}
.trade-switcher-btn svg { opacity: .5; transition: transform .15s; }
.trade-switcher.open .trade-switcher-btn svg { transform: rotate(180deg); }
.trade-dropdown {
  display: none; position: absolute; top: calc(100% + 6px); left: 0;
  min-width: 220px; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); z-index: 200;
  padding: 4px; overflow: hidden;
}
.trade-switcher.open .trade-dropdown { display: block; }
.trade-option {
  display: flex; align-items: center; gap: 8px; width: 100%;
  background: transparent; border: none; padding: 10px 12px; cursor: pointer;
  color: var(--text); font-size: 0.85rem; text-align: left; border-radius: var(--radius-sm);
  transition: background .12s;
}
.trade-option:hover { background: var(--bg-elev-2); }
.trade-option.active { background: var(--bg-elev-2); }
.trade-option.active strong { color: var(--accent); }
.trade-option strong { font-size: 0.9rem; min-width: 36px; }
.trade-option span { color: var(--text-dim); font-size: 0.82rem; }

.nav ul {
  list-style: none; display: flex; gap: 4px; margin: 0 0 0 auto; padding: 0;
  align-items: center;
}
.nav-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}
.auth-slot {
  display: flex;
  align-items: center;
  gap: 8px;
}
.auth-user {
  font-size: 0.78rem;
  color: var(--text-dim);
  padding: 0 2px;
  max-width: 180px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.btn-sm {
  padding: 8px 10px;
  font-size: 0.82rem;
  border-radius: 8px;
}
.nav-menu-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elev);
  color: var(--text);
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
}
.nav-menu-toggle .bars {
  width: 16px;
  height: 12px;
  position: relative;
  display: inline-block;
}
.nav-menu-toggle .bars::before,
.nav-menu-toggle .bars::after,
.nav-menu-toggle .bars span {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-menu-toggle .bars::before { top: 0; }
.nav-menu-toggle .bars span { top: 5px; }
.nav-menu-toggle .bars::after { top: 10px; }

.nav.nav-open .nav-menu-toggle .bars::before { transform: translateY(5px) rotate(45deg); }
.nav.nav-open .nav-menu-toggle .bars span { opacity: 0; }
.nav.nav-open .nav-menu-toggle .bars::after { transform: translateY(-5px) rotate(-45deg); }
.nav a.link {
  display: inline-block; padding: 8px 12px; border-radius: 8px;
  color: var(--text-dim); font-weight: 500;
}
.nav a.link:hover { background: var(--bg-elev); color: var(--text); text-decoration: none; }
.nav a.link.active {
  background: var(--bg-elev-2);
  color: var(--text);
  border: 1px solid var(--border);
}

/* ---------- Hero ---------- */
.hero { padding: 64px 0 24px; }
.hero .tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: transparent;
  color: var(--text-dim);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--border);
}
.hero p.lead { font-size: 1.1rem; color: var(--text-dim); max-width: 720px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 16px; border-radius: 8px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
  font-family: inherit; font-size: 0.95rem;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #111; font-weight: 700; }
.btn-primary:hover { background: var(--accent-2); color: #111; text-decoration: none; }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg-elev); text-decoration: none; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }

/* ---------- Cards / Grid ---------- */
.grid { display: grid; gap: 18px; }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 900px) { .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; }
.card .icon {
  min-width: 40px;
  width: fit-content;
  height: 24px;
  border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--bg-elev-2);
  color: var(--text-dim);
  border: 1px solid var(--border);
  margin-bottom: 10px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
  padding: 0 10px;
}
.card a.cta { display: inline-block; margin-top: 10px; color: var(--accent); font-weight: 600; }

/* ---------- Home template ---------- */
.home-template { padding: 20px 0 80px; }
.home-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.8fr);
  gap: 18px;
  align-items: stretch;
}
.home-hero-copy {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}
.home-hero-copy h1 {
  max-width: 16ch;
  line-height: 1.12;
}
.home-hero-copy .btn-row { margin-top: 18px; }

.home-snapshot {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.home-snapshot h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
  color: var(--text-dim);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.snapshot-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--border);
  padding: 8px 0;
}
.snapshot-row:last-child { border-bottom: none; }
.snapshot-row span {
  color: var(--text-dim);
  font-size: 0.9rem;
}
.snapshot-row strong {
  color: var(--text);
  font-size: 0.95rem;
}

.home-feature-list {
  margin-top: 16px;
  display: grid;
  gap: 12px;
}
.feature-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 14px;
  padding: 16px 18px;
}
.feature-row .icon { margin: 2px 0 0; }
.feature-row h3 { margin: 0 0 6px; font-size: 1.05rem; }
.feature-row p { margin: 0; }
.feature-row .cta {
  margin-top: 0;
  align-self: center;
  white-space: nowrap;
}

.stats {
  display: grid; grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 12px; margin-top: 28px;
}
@media (max-width: 700px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 14px;
}
.stat .n { font-size: 1.6rem; font-weight: 800; color: var(--text); }
.stat .l { color: var(--text-dim); font-size: 0.85rem; }

/* ---------- Study page ---------- */
.study-layout { display: grid; grid-template-columns: 260px 1fr; gap: 28px; padding: 30px 0 80px; }
@media (max-width: 900px) { .study-layout { grid-template-columns: 1fr; } }
.toc {
  position: sticky; top: 80px; align-self: start;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px;
  max-height: calc(100vh - 100px); overflow-y: auto;
}
.toc h4 { margin: 6px 10px; color: var(--text-dim); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; }
.toc a {
  display: block; padding: 8px 10px; border-radius: 8px;
  color: var(--text-dim); font-size: 0.92rem;
}
.toc a:hover { background: var(--bg-elev-2); color: var(--text); text-decoration: none; }
.toc a.active { background: var(--bg-elev-2); color: var(--text); border: 1px solid var(--border); }

.topic {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 20px;
  scroll-margin-top: 90px;
}
.topic h2 { margin-top: 0; color: var(--text); display: flex; align-items: center; gap: 10px; }
.topic .pct { font-size: 0.8rem; font-weight: 600; padding: 3px 10px; border-radius: 999px;
  background: rgba(158, 160, 160, 0.12); color: var(--info); border: 1px solid rgba(158,160,160,.3); }
.topic ul { padding-left: 1.2em; }
.topic li { margin: 6px 0; color: var(--text-dim); }
.topic li strong { color: var(--text); font-weight: 600; }
.topic .kv { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 12px 0; }
@media (max-width: 700px) { .topic .kv { grid-template-columns: 1fr; } }
.topic .kv div { background: var(--bg-elev-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 14px; }

.hot-take {
  border-left: 3px solid var(--accent);
  background: var(--bg-elev-2);
  padding: 10px 14px; border-radius: 0 8px 8px 0;
  margin: 12px 0; color: var(--text);
}
.hot-take strong { color: var(--accent); }

/* ---------- Quiz page ---------- */
.quiz-shell { padding: 30px 0 80px; }
.quiz-setup, .quiz-runner, .quiz-results {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 20px;
}
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 16px; }
.quick-starts { margin: 14px 0 18px; }
.quick-start-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.quick-start-btn { white-space: nowrap; }
.chip {
  padding: 8px 14px; border-radius: 999px; cursor: pointer;
  background: var(--bg-elev-2); border: 1px solid var(--border);
  color: var(--text-dim); font-size: 0.9rem; user-select: none;
}
.chip.active { background: var(--bg-elev); border-color: var(--accent); color: var(--text); }
.chip:hover { color: var(--text); }

.field { display: flex; align-items: center; gap: 10px; margin: 10px 0; }
.field label { min-width: 140px; color: var(--text-dim); font-size: 0.92rem; }
.field input[type="number"], .field select {
  background: var(--bg-elev-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 10px; color: var(--text);
  font-family: inherit; font-size: 0.95rem;
}
.quiz-tip {
  margin-top: 18px;
  padding: 16px 18px;
}
.quiz-tip h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}
.quiz-tip p {
  margin: 0;
  color: var(--text-dim);
}

.progress-bar {
  height: 6px; background: var(--bg-elev-2); border-radius: 999px; overflow: hidden; margin: 10px 0 18px;
}
.progress-bar > div { height: 100%; background: linear-gradient(90deg, var(--accent-deep), var(--accent-2)); width: 0%; transition: width .25s ease; }
.q-meta { display: flex; justify-content: space-between; color: var(--text-dim); font-size: 0.85rem; margin-bottom: 8px; }
.q-text { font-size: 1.12rem; font-weight: 600; margin: 8px 0 16px; }
.q-topic { display: inline-block; margin-left: 6px; font-size: 0.72rem; padding: 2px 8px; border-radius: 999px;
  background: rgba(158,160,160,.12); color: var(--info); border: 1px solid rgba(158,160,160,.3); vertical-align: middle; }

.options { display: grid; gap: 10px; }
.option {
  padding: 12px 14px; border-radius: 10px; cursor: pointer;
  background: var(--bg-elev-2); border: 1px solid var(--border); color: var(--text);
  display: flex; align-items: flex-start; gap: 10px; transition: border-color .1s ease, background .1s ease;
}
.option:hover { border-color: var(--accent); }
.option .k {
  flex: 0 0 28px; height: 28px; border-radius: 8px;
  background: var(--bg-elev); display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; color: var(--text-dim); font-family: var(--mono); font-size: 0.85rem;
}
.option.selected { border-color: var(--accent); background: rgba(155, 160, 168, 0.10); }
.option.correct { border-color: var(--good); background: rgba(139, 179, 106, 0.12); }
.option.correct .k { background: var(--good); color: #0f1a08; }
.option.incorrect { border-color: var(--bad); background: rgba(215, 103, 103, 0.12); }
.option.incorrect .k { background: var(--bad); color: #2a0a0a; }

.explain {
  margin-top: 14px; padding: 12px 14px;
  background: rgba(158,160,160,.07); border: 1px solid rgba(158,160,160,.25);
  border-radius: 10px; color: var(--text);
}
.explain-shell { margin-top: 14px; }
.explain-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  background: rgba(158,160,160,.07);
  border: 1px solid rgba(158,160,160,.25);
  border-radius: 10px;
  color: var(--text);
}
.explain strong { color: var(--accent); }

.quiz-ctl { display: flex; gap: 10px; justify-content: space-between; margin-top: 18px; }

.result-big { font-size: 3rem; font-weight: 900; }
.result-big.pass { color: var(--good); }
.result-big.fail { color: var(--bad); }
.result-breakdown { margin-top: 18px; }
.result-breakdown .row {
  display: grid; grid-template-columns: 1fr 80px 120px;
  gap: 10px; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--border);
}
.result-breakdown .row:last-child { border-bottom: none; }
.bar-tiny {
  height: 6px; background: var(--bg-elev-2); border-radius: 999px; overflow: hidden;
}
.bar-tiny > div { height: 100%; background: var(--good); }

/* ---------- Cheatsheet ---------- */
.cheat-topbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin: 24px 0 12px; }
.cheat-doc {
  background: white; color: #111;
  border-radius: var(--radius); padding: 28px 32px; margin-bottom: 40px;
  box-shadow: var(--shadow);
}
.cheat-doc h1, .cheat-doc h2, .cheat-doc h3 { color: #111; }
.cheat-doc h1 { border-bottom: 3px solid #d0a060; padding-bottom: 8px; }
.cheat-doc h2 {
  background: #1a1814; color: #e8c589; padding: 6px 12px; border-radius: 6px;
  font-size: 1.1rem; margin-top: 20px;
  border-left: 4px solid #d0a060;
}
.cheat-doc h3 { color: #8c6a2f; margin-top: 12px; font-size: 1rem; }
.cheat-doc p, .cheat-doc li { color: #222; }
.cheat-doc ul { padding-left: 1.2em; margin: 6px 0 10px; }
.cheat-doc li { margin: 2px 0; font-size: 0.93rem; }
.cheat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 700px) { .cheat-grid { grid-template-columns: 1fr; } }
.cheat-reminders {
  columns: 2;
  column-gap: 30px;
  margin-top: 6px;
}
@media (max-width: 700px) { .cheat-reminders { columns: 1; } }
.cheat-box {
  border: 1px solid #ddd; border-radius: 8px; padding: 10px 14px; background: #fafafa;
}
.cheat-box h3 { margin-top: 0; }
.cheat-kbd {
  display: inline-block; font-family: var(--mono); font-size: 0.8rem;
  background: #eee; color: #111; padding: 2px 6px; border-radius: 4px; border: 1px solid #ccc;
}
.cheat-footer { margin-top: 20px; border-top: 1px dashed #bbb; padding-top: 10px;
  font-size: 0.8rem; color: #666; display: flex; justify-content: space-between; }

/* ---------- Mobile-first refinements ---------- */
@media (max-width: 900px) {
  .container { padding: 0 16px; }

  .nav-inner {
    flex-wrap: wrap;
    padding: 10px 16px;
  }
  .logo { order: 1; }
  .trade-switcher { order: 1; margin-left: 0; }
  .trade-dropdown { left: 0; right: auto; }
  .nav-controls {
    order: 2;
    margin-left: auto;
  }
  .auth-user { display: none; }
  .nav-menu-toggle { display: inline-flex; }
  .nav ul {
    order: 3;
    width: 100%;
    display: none;
    margin: 8px 0 0;
    padding: 8px;
    gap: 6px;
    flex-direction: column;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 12px;
  }
  .nav.nav-open ul { display: flex; }
  .nav a.link {
    width: 100%;
    text-align: left;
    padding: 10px 12px;
  }

  .hero { padding: 36px 0 14px; }
  .hero p.lead { font-size: 1rem; }

  .home-template { padding: 12px 0 50px; }
  .home-hero-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .home-hero-copy {
    padding: 18px 16px;
  }
  .home-hero-copy h1 {
    max-width: none;
    font-size: clamp(1.55rem, 7vw, 2rem);
  }
  .home-snapshot {
    padding: 16px;
  }
  .feature-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .feature-row .cta {
    justify-self: start;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-elev-2);
  }

  .btn-row .btn {
    width: 100%;
    justify-content: center;
  }

  .study-layout {
    gap: 16px;
    padding: 14px 0 50px;
  }
  .toc {
    position: static;
    top: auto;
    max-height: none;
  }
  .topic { padding: 18px; }

  .quiz-shell { padding: 16px 0 50px; }
  .quiz-setup, .quiz-runner, .quiz-results { padding: 16px; }
  .field {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }
  .field label { min-width: 0; }
  .field input[type="number"],
  .field select { width: 100%; }
  .q-meta {
    flex-wrap: wrap;
    gap: 8px;
  }
  .q-text { font-size: 1.02rem; }
  .quiz-ctl {
    flex-direction: column;
    gap: 8px;
  }
  .quiz-ctl .btn {
    width: 100%;
    justify-content: center;
  }
  .result-breakdown .row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .cheat-topbar {
    flex-wrap: wrap;
    align-items: flex-start;
  }
  .cheat-topbar .btn {
    width: 100%;
    justify-content: center;
  }
  .cheat-doc {
    padding: 18px 16px;
    border-radius: 10px;
  }
  .cheat-footer {
    display: block;
  }
  .cheat-footer span {
    display: block;
    margin-bottom: 6px;
  }
}

@media (max-width: 520px) {
  .stats { grid-template-columns: 1fr; }
  .purchase-two-col { grid-template-columns: 1fr; }
}

/* ---------- Login portal ---------- */
.auth-page {
  min-height: calc(100vh - 120px);
  display: grid;
  place-items: center;
  padding: 24px 0 60px;
}
.auth-card {
  width: 100%;
  max-width: 460px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}
.auth-card h1 {
  font-size: 1.7rem;
  margin-bottom: 10px;
}
.auth-help {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.auth-form {
  display: grid;
  gap: 12px;
}
.auth-form label {
  font-size: 0.9rem;
  color: var(--text-dim);
}
.auth-form input {
  width: 100%;
  background: var(--bg-elev-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
}
.auth-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 4px;
}
.auth-status {
  min-height: 22px;
  font-size: 0.88rem;
  color: var(--text-dim);
}
.auth-status.error { color: var(--bad); }
.auth-status.success { color: var(--good); }

/* Member portal (single column) */
.auth-portal-single {
  width: 100%;
  max-width: 440px;
  margin: 0 auto;
}
.auth-kicker {
  margin: 0 0 6px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.auth-help-tight {
  margin-bottom: 14px;
  line-height: 1.45;
}
.auth-card-login h1 {
  margin-bottom: 8px;
}
.auth-portal-divider {
  height: 1px;
  background: var(--border);
  margin: 22px 0;
}
.auth-h2 {
  font-size: 1.2rem;
  margin: 0 0 8px;
  font-weight: 700;
}
.auth-card-minimal {
  padding: 18px 22px;
}
.auth-full-btn {
  display: flex;
  width: 100%;
  justify-content: center;
  margin-top: 4px;
}
.nav-controls-login {
  margin-left: auto;
  flex-shrink: 0;
}
.purchase-nav-links {
  list-style: none;
  display: flex;
  gap: 2px;
  margin: 0 auto 0 12px;
  padding: 0;
  align-items: center;
}
@media (max-width: 640px) {
  .purchase-nav-links {
    display: none;
  }
}

/* Purchase page layout */
.purchase-main {
  padding-bottom: 56px;
  max-width: 900px;
}
.purchase-status-banner {
  margin: 16px 0 0;
  min-height: 0;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  font-size: 0.9rem;
  color: var(--text-dim);
}
.purchase-status-banner.error {
  border-color: rgba(217, 83, 79, 0.45);
  color: var(--bad);
  background: rgba(217, 83, 79, 0.08);
}
.purchase-status-banner.success {
  border-color: rgba(92, 184, 92, 0.45);
  color: var(--good);
  background: rgba(92, 184, 92, 0.08);
}
.purchase-hero {
  padding-top: 28px;
  padding-bottom: 8px;
}
.purchase-lead {
  max-width: 640px;
}
.purchase-account-card {
  margin-top: 10px;
  margin-bottom: 18px;
}
.purchase-signup-form {
  margin-top: 8px;
}
.purchase-card-desc {
  color: var(--text-dim);
  margin: 0 0 10px;
  font-size: 0.95rem;
}
.auth-help-foot {
  margin-top: 14px;
  margin-bottom: 0;
  font-size: 0.82rem;
}

/* ---------- Purchase page ---------- */
.purchase-grid,
.purchase-secondary {
  margin-top: 18px;
}
.purchase-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.purchase-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 68px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid rgba(208,160,80,0.35);
  background: rgba(208,160,80,0.1);
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.04em;
}
.purchase-list {
  margin: 0;
  padding-left: 18px;
  color: var(--text-dim);
}
.purchase-list li {
  margin: 8px 0;
}
.purchase-request-card {
  margin-top: 18px;
}
.purchase-form {
  margin-top: 14px;
}
.purchase-two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.purchase-form select {
  width: 100%;
  background: var(--bg-elev-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
}
.account-card {
  margin-top: 18px;
}
.account-grid {
  margin-top: 10px;
  gap: 16px;
}
.account-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.account-panel h3,
.account-license-card h3 {
  margin: 0;
}
.account-summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.account-license-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 12px;
}
.account-license-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.admin-card {
  margin-top: 18px;
}
.admin-summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 12px;
}
.admin-action-grid {
  margin-top: 10px;
}
@media (max-width: 640px) {
  .account-summary {
    align-items: stretch;
  }
}

.trade-option.locked {
  opacity: 0.55;
  cursor: not-allowed;
}
.trade-option.locked:hover {
  background: transparent;
}

/* Print styles: one clean printable cheatsheet */
@media print {
  body { background: white !important; color: #111 !important; }
  .nav, .cheat-topbar, footer, .no-print { display: none !important; }
  .container { max-width: none; padding: 0; }
  .cheat-doc {
    box-shadow: none; border-radius: 0; padding: 0; margin: 0;
  }
  .cheat-doc h2 { background: #1a1814 !important; color: #e8c589 !important; border-left-color: #d0a060 !important; }
  .cheat-grid { gap: 10px; }
  @page { size: letter; margin: 14mm; }
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--border); padding: 30px 0;
  color: var(--muted); font-size: 0.88rem; text-align: center;
}
footer a { color: var(--text-dim); }
footer .powered {
  display: block; margin-top: 6px; font-size: 0.8rem;
  color: var(--muted);
}
footer .powered a { color: var(--accent); }
footer .legal-note {
  display: block;
  margin-top: 4px;
  font-size: 0.75rem;
  color: var(--muted);
}
footer .legal-note a { color: var(--text-dim); }

/* ---------- Theme toggle ---------- */
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--text-dim); cursor: pointer;
  font-size: 1.15rem; transition: background 0.15s ease, color 0.15s ease;
  flex-shrink: 0; padding: 0; font-family: inherit;
}
.theme-toggle:hover { background: var(--bg-elev-2); color: var(--text); }
.theme-toggle .icon-sun,
.theme-toggle .icon-moon { pointer-events: none; }
.theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: inline; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ---------- Light-mode cheatsheet doc adjustments ---------- */
[data-theme="light"] .cheat-doc {
  background: #fff;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}
[data-theme="light"] .cheat-box {
  background: #f9f7f3;
  border-color: #d5cfc4;
}

/* ---------- Light-mode button primary text contrast ---------- */
[data-theme="light"] .btn-primary { color: #fff; }
[data-theme="light"] .btn-primary:hover { color: #fff; }
[data-theme="light"] .logo-badge { color: #fff; }

/* ---------- Light-mode quiz feedback ---------- */
[data-theme="light"] .option.correct { background: rgba(62,122,30,0.08); }
[data-theme="light"] .option.correct .k { color: #fff; }
[data-theme="light"] .option.incorrect { background: rgba(179,51,51,0.08); }
[data-theme="light"] .option.incorrect .k { color: #fff; }

/* ---------- Misc ---------- */
.kbd { font-family: var(--mono); background: var(--bg-elev-2); padding: 1px 6px; border-radius: 4px; border: 1px solid var(--border); font-size: 0.85em; }
.tag-dot { display: inline-block; width: 8px; height: 8px; border-radius: 999px; vertical-align: middle; margin-right: 6px; }
.hidden { display: none !important; }