:root {
  --primary: #6366f1;
  --accent: #22d3ee;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --bg: #0b1120;
  --surface: #1f2937;
  --surface-light: #374151;
  --border: #2b3648;
  --text: #f3f4f6;
  --text-dim: #a3adc2;
  --text-faint: #7c8aa3;
  --radius: 16px;
  --radius-sm: 10px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 520px;
  margin: 0 auto;
  position: relative;
}

#screen {
  flex: 1;
  padding: 16px 16px 96px;
  overflow-x: hidden;
}

/* ---------- Splash ---------- */
.splash {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: radial-gradient(circle at 50% 30%, #1e2a4a 0%, var(--bg) 70%);
}
.splash-logo {
  width: 72px; height: 72px; border-radius: 20px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 40px rgba(99,102,241,0.5);
}
.splash-title { font-size: 22px; font-weight: 700; letter-spacing: 1px; }
.splash-sub { color: var(--text-dim); font-size: 13px; }
.spinner {
  width: 24px; height: 24px; border-radius: 50%;
  border: 3px solid var(--surface-light);
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Header ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 4px 6px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center; color: #fff;
}
.brand-name { font-weight: 700; font-size: 16px; letter-spacing: 0.5px; }
.brand-sub { font-size: 11px; color: var(--text-dim); margin-top: -2px; }
.tier-pill {
  font-size: 12px; font-weight: 600; padding: 6px 12px; border-radius: 999px;
  background: rgba(99,102,241,0.18); color: #c7d2fe; border: 1px solid rgba(99,102,241,0.4);
  display: flex; align-items: center; gap: 6px;
}
.icon-btn {
  width: 44px; height: 44px; border-radius: 10px; background: var(--surface);
  display: flex; align-items: center; justify-content: center; color: var(--text-dim);
  border: 1px solid var(--border); margin: -7px -7px -7px 0;
}

.back-row { display: flex; align-items: center; gap: 6px; padding: 12px 0; }
.back-btn {
  color: var(--text-dim); display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; margin: -10px 0 -10px -10px; background: none; border: none;
}
.screen-title { font-size: 18px; font-weight: 700; }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
}
.card-hero {
  background: linear-gradient(135deg, #1c2440, #16213e 60%, #0f3460);
  border: 1px solid rgba(99,102,241,0.35);
}
.hero-greet { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.hero-sub { font-size: 13px; color: var(--text-dim); line-height: 1.5; }

.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 14px; }
.stat-tile {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px; display: flex; flex-direction: column; gap: 2px;
}
.stat-num { font-size: 20px; font-weight: 700; }
.stat-label { font-size: 12px; color: var(--text-dim); }

.section-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px;
}
.section-title { font-size: 14px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.section-title svg { color: var(--accent); flex-shrink: 0; }
.section-link { font-size: 12px; color: var(--accent); }

.list-row {
  display: flex; align-items: center; gap: 12px; padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.list-row:last-child { border-bottom: none; }
.row-icon {
  width: 34px; height: 34px; border-radius: 10px; background: var(--surface-light);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0; color: var(--accent);
}
.row-body { flex: 1; min-width: 0; }
.row-title { font-size: 14px; font-weight: 600; }
.row-sub { font-size: 12.5px; color: var(--text-dim); margin-top: 1px; }
.row-meta { font-size: 12px; color: var(--text-faint); white-space: nowrap; }

.chip {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 11.5px; padding: 5px 10px; border-radius: 999px;
  background: var(--surface-light); color: var(--text-dim); margin: 3px 6px 3px 0;
}

.tabs { display: flex; gap: 6px; margin-bottom: 12px; overflow-x: auto; }
.tab {
  padding: 7px 14px; border-radius: 999px; font-size: 12.5px; font-weight: 600;
  background: var(--surface); color: var(--text-dim); border: 1px solid var(--border);
  white-space: nowrap;
}
.tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.scenario-card {
  display: flex; align-items: center; gap: 12px; padding: 14px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 10px;
}
.scenario-icon {
  width: 40px; height: 40px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(99,102,241,0.15); color: var(--accent); flex-shrink: 0;
}
.scenario-title { font-size: 14px; font-weight: 700; }
.scenario-sub { font-size: 12px; color: var(--text-dim); }
.chev { color: var(--text-faint); display: flex; }

/* ---------- Buttons / forms ---------- */
.btn {
  display: block; width: 100%; text-align: center; padding: 13px;
  border-radius: 12px; font-size: 14px; font-weight: 700; border: none;
  background: var(--primary); color: #fff; cursor: pointer; min-height: 44px;
}
.btn.secondary { background: var(--surface-light); color: var(--text); }
.btn.danger { background: rgba(239,68,68,0.15); color: #fca5a5; border: 1px solid rgba(239,68,68,0.4); }
.btn:disabled { opacity: 0.5; }

.fab {
  position: fixed; left: 50%; bottom: 84px;
  transform: translateX(calc(-50% + 200px));
  width: 52px; height: 52px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; border: none; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 20px rgba(99,102,241,0.5); z-index: 15;
}
@media (max-width: 520px) {
  .fab { transform: none; right: 16px; left: auto; }
}

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 12px; color: var(--text-dim); margin-bottom: 6px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 11px 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font-size: 14px; font-family: inherit;
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent);
}
.field textarea { resize: vertical; min-height: 70px; }
.seg { display: flex; gap: 8px; }
.seg-btn {
  flex: 1; padding: 10px; border-radius: 10px; text-align: center; font-size: 13px; font-weight: 600;
  background: var(--surface); border: 1px solid var(--border); color: var(--text-dim); min-height: 40px;
}
.seg-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.toggle-row { display: flex; align-items: center; justify-content: space-between; padding: 10px 0; }
.toggle-row .row-title { font-size: 13px; font-weight: 600; }
.switch { position: relative; width: 42px; height: 24px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .track {
  position: absolute; inset: 0; background: var(--surface-light); border-radius: 999px; transition: 0.2s;
}
.switch .thumb {
  position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 50%;
  background: #fff; transition: 0.2s;
}
.switch input:checked + .track { background: var(--primary); }
.switch input:checked + .track .thumb { transform: translateX(18px); }
.switch input:focus-visible + .track { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- Bottom nav ---------- */
.bottom-nav {
  position: fixed; left: 50%; transform: translateX(-50%); bottom: 0; width: 100%; max-width: 520px;
  background: rgba(15,20,35,0.92); backdrop-filter: blur(10px);
  border-top: 1px solid var(--border);
  display: flex; padding: 8px 4px calc(8px + env(safe-area-inset-bottom));
  z-index: 20;
}
.nav-item {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 3px;
  color: var(--text-faint); font-size: 10px; padding: 4px 0; min-height: 44px;
  background: none; border: none;
}
.nav-item .nav-ic { display: flex; }
.nav-item.active { color: var(--accent); }

/* ---------- Touch targets for icon-only controls ---------- */
.tap-icon {
  min-width: 44px; min-height: 44px; display: flex; align-items: center; justify-content: center;
  margin: -12px; background: none; border: none; color: inherit; flex-shrink: 0;
}

/* ---------- Focus visibility (kept from accessibility pass) ---------- */
.icon-btn:focus-visible, .back-btn:focus-visible, .tap-icon:focus-visible,
.nav-item:focus-visible, .list-row[role="button"]:focus-visible,
.scenario-card:focus-visible, .tab:focus-visible, .seg-btn:focus-visible,
.stat-tile[role="button"]:focus-visible, .fab:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 8px;
}

/* ---------- Misc ---------- */
.empty-state { text-align: center; color: var(--text-dim); padding: 40px 20px; font-size: 13px; }
.error-banner {
  background: rgba(239,68,68,0.12); border: 1px solid rgba(239,68,68,0.3); color: #fca5a5;
  padding: 10px 12px; border-radius: 10px; font-size: 12px; margin-bottom: 12px;
}
.danger-note {
  background: rgba(245,158,11,0.1); border: 1px solid rgba(245,158,11,0.3); color: #fcd34d;
  padding: 10px 12px; border-radius: 10px; font-size: 12px; margin-bottom: 12px;
}
.progress-bar { height: 6px; border-radius: 999px; background: var(--surface-light); overflow: hidden; margin-top: 6px; }
.progress-bar > div { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); }
.mono-block { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 11px; white-space: pre-wrap; color: var(--text-dim); line-height: 1.6; }
a { color: inherit; text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2.4s; }
  .switch .track, .switch .thumb, .tab, .nav-item { transition: none; }
}