:root {
  color-scheme: light dark;
  --bg: #0b1020;
  --card: #151c33;
  --card-2: #1b2542;
  --text: #edf1ff;
  --muted: #b4bfd9;
  --accent: #6ea8fe;
  --accent-2: #8c6dff;
  --success: #2ecc71;
  --danger: #ff6b6b;
  --border: rgba(255,255,255,.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(180deg, #0a0f1d 0%, #121932 100%);
  color: var(--text);
}

button, select {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 14px 28px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.topbar-compact {
  padding: 6px 2px 2px;
}

.topbar-brand {
  min-width: 0;
}

.topbar-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
}

.topbar-subtitle {
  color: var(--muted);
  font-size: 13px;
  margin-top: 2px;
}

.eyebrow {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

h1, h2, h3, p {
  margin: 0;
}

.card {
  background: rgba(21, 28, 51, .94);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 18px;
  box-shadow: 0 16px 38px rgba(0,0,0,.22);
}

.light-card {
  background: rgba(21, 28, 51, .82);
  box-shadow: 0 10px 24px rgba(0,0,0,.16);
}

.stack {
  display: grid;
  gap: 14px;
}

.page-stack {
  gap: 16px;
}

.page-card {
  gap: 16px;
}

.section-title {
  display: grid;
  gap: 4px;
}

.section-title h3,
.section-title h2 {
  line-height: 1.25;
}

.section-title p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.section-title-hero {
  gap: 6px;
}

.section-title-tight {
  gap: 6px;
}

.surface-panel {
  padding: 16px;
  border-radius: 18px;
  background: rgba(255,255,255,.035);
  border: 1px solid rgba(255,255,255,.07);
}

.auth-layout {
  max-width: 520px;
  margin: 0 auto;
}

.row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.primary-btn, .secondary-btn, .ghost-btn, .option-btn {
  border: 0;
  border-radius: 16px;
  padding: 14px 16px;
  cursor: pointer;
  transition: transform .08s ease, opacity .15s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
}

.primary-btn:hover, .secondary-btn:hover, .ghost-btn:hover, .option-btn:hover {
  transform: translateY(-1px);
}

.primary-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  font-weight: 700;
  box-shadow: 0 12px 26px rgba(110, 168, 254, .18);
}

.secondary-btn {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255,255,255,.12);
}

.secondary-btn:hover {
  background: rgba(255,255,255,.05);
  border-color: rgba(255,255,255,.18);
}

.secondary-btn.is-active {
  background: rgba(110, 168, 254, .14);
  border-color: rgba(110, 168, 254, .45);
  box-shadow: 0 0 0 1px rgba(110, 168, 254, .12) inset;
}

.ghost-btn {
  background: transparent;
  color: var(--muted);
  border: 1px solid rgba(255,255,255,.1);
}

.ghost-btn:hover {
  background: rgba(255,255,255,.04);
  color: var(--text);
  border-color: rgba(255,255,255,.16);
}

.primary-wide {
  flex: 1 1 260px;
}

.ghost-btn-compact {
  min-height: 42px;
  padding: 10px 14px;
  border-radius: 12px;
}

.ghost-btn-inline {
  min-height: 38px;
  padding: 8px 12px;
  border-radius: 12px;
}

.primary-btn-large {
  width: 100%;
  min-height: 58px;
  font-size: 17px;
}

.secondary-btn-soft {
  width: 100%;
  color: var(--muted);
}

.tab-group {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border-radius: 14px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  align-self: flex-start;
}

.tab-btn {
  min-height: 42px;
  padding: 10px 14px;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  border: 0;
}

.tab-btn:hover {
  background: rgba(255,255,255,.05);
  color: var(--text);
}

.tab-btn.is-active {
  background: rgba(110,168,254,.16);
  color: var(--text);
  box-shadow: 0 0 0 1px rgba(110,168,254,.2) inset;
}

.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

select {
  width: 100%;
  background: #0e1529;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
}

.badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 12px;
  background: rgba(255,255,255,.07);
  color: var(--text);
  border: 1px solid var(--border);
}

.badge-success {
  background: rgba(46, 204, 113, .16);
  border-color: rgba(46, 204, 113, .35);
}

.badge-danger {
  background: rgba(255, 107, 107, .16);
  border-color: rgba(255, 107, 107, .35);
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.progress-track {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.05);
}

.progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .2s ease;
}

.question-panel {
  padding: 18px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.02));
  border: 1px solid rgba(255,255,255,.06);
}

.question-copy {
  font-size: 16px;
  line-height: 1.62;
}

.option-btn {
  width: 100%;
  text-align: left;
  background: #0f1730;
  color: var(--text);
  border: 1px solid rgba(255,255,255,.08);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 64px;
}

.option-index {
  width: 28px;
  height: 28px;
  min-width: 28px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  background: rgba(255,255,255,.08);
  color: var(--muted);
  margin-top: 2px;
}

.option-text {
  flex: 1;
  line-height: 1.45;
}

.option-btn.selected {
  border-color: rgba(110, 168, 254, .82);
  background: rgba(110, 168, 254, .14);
  box-shadow: 0 0 0 1px rgba(110, 168, 254, .18) inset, 0 8px 22px rgba(110,168,254,.08);
}

.option-btn.selected .option-index {
  background: rgba(110, 168, 254, .22);
  color: #dce8ff;
}

.option-btn.correct {
  border-color: rgba(46, 204, 113, .6);
  background: rgba(46, 204, 113, .15);
}

.option-btn.correct .option-index {
  background: rgba(46, 204, 113, .2);
  color: #dcffe9;
}

.option-btn.wrong {
  border-color: rgba(255, 107, 107, .65);
  background: rgba(255, 107, 107, .14);
}

.option-btn.wrong .option-index {
  background: rgba(255, 107, 107, .2);
  color: #ffe2e2;
}

button:disabled {
  opacity: .72;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none;
}

.primary-btn:disabled,
.secondary-btn:disabled,
.ghost-btn:disabled,
.option-btn:disabled {
  background: rgba(255,255,255,.04);
  border-color: rgba(255,255,255,.08);
  color: rgba(237,241,255,.55);
}

.action-bar {
  position: sticky;
  bottom: 0;
  padding-top: 4px;
}

.result-hero {
  background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.025));
  box-shadow: 0 18px 42px rgba(0,0,0,.24), 0 0 0 1px rgba(255,255,255,.03) inset;
  gap: 16px;
}

.result-hero-success {
  border-color: rgba(46, 204, 113, .22);
  box-shadow: 0 20px 50px rgba(0,0,0,.24), 0 0 0 1px rgba(46, 204, 113, .06) inset;
}

.result-hero-neutral {
  border-color: rgba(110, 168, 254, .22);
}

.result-hero-warning {
  border-color: rgba(255, 107, 107, .18);
}

.progress-hero {
  border-color: rgba(110, 168, 254, .24);
  background: linear-gradient(180deg, rgba(110,168,254,.08), rgba(255,255,255,.02));
}

.hero-head {
  gap: 10px;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.kpi {
  background: rgba(255,255,255,.035);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 16px;
  padding: 14px;
}

.kpi-highlight {
  background: rgba(110,168,254,.12);
  border-color: rgba(110,168,254,.26);
}

.kpi strong {
  display: block;
  font-size: 22px;
  margin-bottom: 6px;
}

.progress-list, .session-list {
  display: grid;
  gap: 10px;
}

.progress-item, .session-item {
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.07);
  border-radius: 16px;
  padding: 13px 14px;
}

.mini-progress-track {
  width: 100%;
  height: 6px;
  margin-top: 10px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255,255,255,.08);
}

.mini-progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.insight-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.insight-card {
  display: grid;
  gap: 6px;
  background: rgba(255,255,255,.045);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 16px;
  padding: 14px;
}

.insight-card strong {
  font-size: 18px;
  line-height: 1.3;
}

.leaderboard-list {
  display: grid;
  gap: 10px;
}

.leaderboard-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  background: rgba(255,255,255,.035);
  border: 1px solid rgba(255,255,255,.07);
  border-radius: 16px;
  padding: 14px;
}

.leaderboard-item-self {
  background: rgba(110,168,254,.08);
  border-color: rgba(110, 168, 254, .32);
  box-shadow: 0 0 0 1px rgba(110, 168, 254, .1) inset;
}

.leaderboard-rank {
  width: 42px;
  height: 42px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--text);
  background: linear-gradient(135deg, rgba(110, 168, 254, .18), rgba(140, 109, 255, .18));
  border: 1px solid rgba(255,255,255,.08);
}

.leaderboard-main {
  display: grid;
  gap: 10px;
}

.leaderboard-meta {
  display: flex;
  gap: 8px 12px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 13px;
}

.leaderboard-score {
  display: grid;
  gap: 2px;
  justify-items: end;
  min-width: 108px;
  padding: 8px 12px;
  border-radius: 16px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  color: var(--text);
  flex-shrink: 0;
}

.leaderboard-score strong {
  font-size: 18px;
  line-height: 1.1;
  letter-spacing: .01em;
}

.leaderboard-score-label {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.leaderboard-item-self .leaderboard-score {
  background: rgba(110,168,254,.14);
  border-color: rgba(110,168,254,.28);
}

hr.sep {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2px 0;
}

.notice {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  color: var(--text);
  line-height: 1.5;
}

@media (max-width: 480px) {
  .app-shell {
    padding: 14px 12px 24px;
  }

  .topbar-title {
    font-size: 17px;
  }

  .topbar-subtitle {
    font-size: 12px;
  }

  .kpi-grid {
    grid-template-columns: 1fr;
  }

  .insight-grid {
    grid-template-columns: 1fr;
  }

  .leaderboard-item {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .topbar {
    align-items: flex-start;
  }

  .option-btn,
  .primary-btn,
  .secondary-btn,
  .ghost-btn {
    min-height: 56px;
  }

  .option-btn {
    padding: 16px 16px;
  }

  .progress-meta {
    align-items: flex-start;
    flex-direction: column;
  }

  .action-bar {
    grid-template-columns: 1fr;
  }

  .tab-group {
    width: 100%;
  }

  .tab-btn {
    flex: 1 1 0;
    justify-content: center;
  }
}


.topbar-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.home-layout {
  gap: 12px;
}

.home-card {
  gap: 18px;
}

.home-intro {
  gap: 10px;
}

.home-lead {
  color: var(--text);
  line-height: 1.55;
  font-size: 15px;
}

.home-summary {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,.035);
  border: 1px solid rgba(255,255,255,.07);
  color: var(--muted);
  line-height: 1.45;
}

.field-block {
  gap: 8px;
}

.field-block > span {
  color: var(--text);
  font-weight: 600;
}

.home-actions {
  gap: 10px;
}

.home-card-primary {
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.025));
  border-color: rgba(110,168,254,.16);
}

.home-settings {
  gap: 12px;
}


.action-bar-single {
  display: flex;
}

.action-bar-single .primary-wide {
  width: 100%;
}