:root {
  --blue: #0B5CAD;
  --blue-mid: #0B5CAD;
  --blue-soft: #EAF3FF;
  --blue-dim: #C9DCF3;
  --ink: #0F172A;
  --ink-soft: #334155;
  --ink-muted: #64748B;
  --ink-faint: #94A3B8;
  --surface: #FFFFFF;
  --surface-2: #F8FAFC;
  --surface-3: #E2E8F0;
  --surface-4: #CBD5E1;
  --border: rgba(15, 23, 42, 0.08);
  --border-mid: rgba(15, 23, 42, 0.14);
  --border-soft: rgba(15, 23, 42, 0.06);
  --green: #16A34A;
  --green-soft: #ECFDF3;
  --amber: #D97706;
  --amber-soft: #FFF7E6;
  --red: #DC2626;
  --red-soft: #FEF2F2;
  --shadow-xs: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow-md: 0 4px 12px rgba(16, 24, 40, 0.08);
  --shadow-lg: 0 12px 32px rgba(16, 24, 40, 0.12);
  --radius: 10px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --font-sans: 'Figtree', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', 'Figtree', -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
  --coastal-navy: #071426;
  --coastal-blue: #0B2E4A;
  --coastal-teal: #0E7C7B;
  --coastal-glow: rgba(38, 198, 188, 0.22);
  --text-xl: 22px;
  --text-md: 16px;
  --text-sm: 14px;
  --text-xs: 12.5px;
  --text-2xs: 11px;
  --ease: 150ms ease;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--surface-2);
}

button, input, select, textarea {
  font: inherit;
}

button, a, input, select, textarea {
  transition: background var(--ease), border-color var(--ease), color var(--ease), box-shadow var(--ease), transform var(--ease), opacity var(--ease);
}

:focus-visible {
  outline: 2px solid rgba(11, 92, 173, 0.34);
  outline-offset: 2px;
}

.nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
}

.nav-brand {
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 6px 9px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0;
}

.nav-brand:hover {
  background: var(--surface-2);
  color: var(--ink);
}

.home-icon {
  width: 16px;
  height: 16px;
  color: var(--ink-muted);
  flex: 0 0 16px;
}

.nav-brand:hover .home-icon {
  color: var(--ink);
}

.brand-tail {
  color: var(--ink);
  font-weight: 600;
}

.nav-brand-dot {
  display: none;
}

.nav-link {
  color: var(--ink-muted);
  border-radius: var(--radius-sm);
}

.nav-link:hover {
  background: var(--surface-2);
  color: var(--ink);
}

.nav-link.active {
  color: var(--blue);
  background: var(--blue-soft);
}

.btn-logout,
.btn,
.btn-sm,
.btn-cmd,
.task-action,
.tasks-add {
  box-shadow: none;
}

.card,
.panel,
.stat-card,
.export-card,
.filter-bar,
.agenda-grid {
  box-shadow: var(--shadow-sm);
  border-color: var(--border);
}

.stat-number,
.stat-value,
.reg-metric-value,
.readiness-pct,
.page-count,
.tasks-badge,
.task-age,
.time-slot,
.session-time {
  font-variant-numeric: tabular-nums;
}

.page-title,
.cmd-title,
.card-title,
.section-heading,
.modal-title,
.stat-value,
.stat-number,
.reg-metric-value,
.readiness-pct,
.countdown-number,
.masthead-title {
  font-family: var(--font-display);
}

.flagship-page .page-title,
.flagship-page .section-heading,
.flagship-page .card-title,
.flagship-page .cmd-title {
  letter-spacing: 0;
}

.skeleton {
  position: relative;
  overflow: hidden;
  background: linear-gradient(90deg, rgba(226,232,240,.72), rgba(248,250,252,.96), rgba(226,232,240,.72));
  background-size: 220% 100%;
  border-radius: var(--radius-xs);
  animation: ihd-shimmer 1.35s ease-in-out infinite;
}

.skeleton-line { height: 12px; }
.skeleton-block { min-height: 56px; }

@keyframes ihd-shimmer {
  from { background-position: 120% 0; }
  to { background-position: -120% 0; }
}

.load-choreo > *,
.choreo-item {
  animation: ihd-fade-up 220ms ease both;
}

.load-choreo > *:nth-child(2) { animation-delay: 35ms; }
.load-choreo > *:nth-child(3) { animation-delay: 70ms; }
.load-choreo > *:nth-child(4) { animation-delay: 105ms; }
.load-choreo > *:nth-child(5) { animation-delay: 140ms; }
.load-choreo > *:nth-child(6) { animation-delay: 175ms; }

@keyframes ihd-fade-up {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.empty-state,
.activity-empty,
.tasks-empty,
.venue-empty,
.ai-empty {
  color: var(--ink-muted);
}

.empty-state-icon,
.tasks-empty-icon,
.venue-empty-icon,
.ai-empty-icon {
  color: var(--ink-faint);
  font-weight: 500;
}

@media (prefers-reduced-motion: reduce) {
  .skeleton,
  .load-choreo > *,
  .choreo-item {
    animation: none !important;
  }
}

body.agenda-page[data-theme="dark"] {
  --ink: #F8FAFC;
  --ink-soft: #D6E2F0;
  --ink-muted: #91A4BC;
  --ink-faint: #6E8198;
  --surface: #0B1526;
  --surface-2: #08111F;
  --surface-3: #13243A;
  --surface-4: #20344E;
  --border: rgba(148, 163, 184, 0.14);
  --border-mid: rgba(148, 163, 184, 0.22);
  --border-soft: rgba(148, 163, 184, 0.09);
  --blue-soft: rgba(34, 116, 173, 0.16);
  --blue-dim: rgba(125, 190, 255, 0.22);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.24);
  --shadow-md: 0 12px 30px rgba(0,0,0,.28);
}

body.agenda-page[data-theme="dark"] .nav,
body.agenda-page[data-theme="dark"] .cmd-bar,
body.agenda-page[data-theme="dark"] .agenda-subbar,
body.agenda-page[data-theme="dark"] .agenda-grid,
body.agenda-page[data-theme="dark"] .venue-header,
body.agenda-page[data-theme="dark"] .time-col-header,
body.agenda-page[data-theme="dark"] .time-col,
body.agenda-page[data-theme="dark"] .ai-panel,
body.agenda-page[data-theme="dark"] .modal {
  background: var(--surface);
  border-color: var(--border-mid);
}

body.agenda-page[data-theme="dark"] .venue-col,
body.agenda-page[data-theme="dark"] .time-row-bg,
body.agenda-page[data-theme="dark"] .time-slot {
  border-color: var(--border-soft);
}

body.agenda-page[data-theme="dark"] .session-card {
  background: #102038;
  color: var(--ink);
  border-color: rgba(148, 163, 184, .18);
  box-shadow: 0 0 0 1px rgba(255,255,255,.025), 0 10px 22px rgba(0,0,0,.18);
}

body.agenda-page[data-theme="dark"] .session-card.plenary { box-shadow: 0 0 0 1px rgba(96,165,250,.20), 0 10px 22px rgba(0,0,0,.18); }
body.agenda-page[data-theme="dark"] .session-card.session { box-shadow: 0 0 0 1px rgba(45,212,191,.20), 0 10px 22px rgba(0,0,0,.18); }
body.agenda-page[data-theme="dark"] .session-card.workshop { box-shadow: 0 0 0 1px rgba(251,146,60,.20), 0 10px 22px rgba(0,0,0,.18); }

body.agenda-page[data-theme="dark"] .break-band.tea { background: rgba(146, 64, 14, .20); color: #F8D6A2; border-color: rgba(248, 214, 162, .20); }
body.agenda-page[data-theme="dark"] .break-band.lunch { background: rgba(22, 101, 52, .22); color: #A7F3D0; border-color: rgba(167, 243, 208, .18); }
body.agenda-page[data-theme="dark"] .now-line { background: #38BDF8; box-shadow: 0 0 0 1px rgba(56,189,248,.24), 0 0 18px rgba(56,189,248,.38); }
body.agenda-page[data-theme="dark"] .agenda-search,
body.agenda-page[data-theme="dark"] .btn-cmd,
body.agenda-page[data-theme="dark"] .program-tab,
body.agenda-page[data-theme="dark"] .day-tab,
body.agenda-page[data-theme="dark"] .legend-toggle,
body.agenda-page[data-theme="dark"] .agenda-list-row,
body.agenda-page[data-theme="dark"] .archived-panel,
body.agenda-page[data-theme="dark"] .form-field input,
body.agenda-page[data-theme="dark"] .form-field select,
body.agenda-page[data-theme="dark"] .form-field textarea {
  background: #102038;
  color: var(--ink);
  border-color: var(--border-mid);
}

body.agenda-page[data-theme="dark"] .program-tab.active,
body.agenda-page[data-theme="dark"] .day-tab.active,
body.agenda-page[data-theme="dark"] .btn-cmd.primary {
  background: #0E7C7B;
  color: #fff;
  border-color: rgba(45,212,191,.32);
}

body.agenda-page[data-theme="dark"] .venue-empty {
  background: rgba(16, 32, 56, .58);
  color: var(--ink-muted);
}