/* Chronos design system (Phase 3 — Direction B) */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --bg-base: #020617;         /* slate-950 */
  --bg-surface: #0f172a;      /* slate-900 */
  --bg-surface-2: #111827;    /* slate-900 alt */
  --border: #1f2937;          /* slate-800 */
  --border-strong: #334155;   /* slate-700 */
  --text-primary: #f1f5f9;    /* slate-100 */
  --text-secondary: #94a3b8;  /* slate-400 */
  --text-muted: #64748b;      /* slate-500 */
  --accent: #10b981;          /* emerald-500 */
  --accent-strong: #6ee7b7;   /* emerald-300 */
  --accent-bg: rgba(16, 185, 129, 0.12);
}

html, body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-feature-settings: 'cv11';
  background-color: var(--bg-base);
  color: var(--text-primary);
}

.num, .stat-num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
}

/* Top navigation */
.topnav {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.topnav-inner {
  max-width: 1152px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
}
.logo-mark {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: linear-gradient(135deg, #34d399, #059669);
}
.nav-link {
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: all 0.15s;
}
.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}
.nav-link.active {
  color: var(--accent-strong);
  background: var(--accent-bg);
}
.nav-btn {
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all 0.15s;
  background: transparent;
}
.nav-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}
.nav-btn-primary {
  background: var(--accent);
  color: white;
  font-weight: 500;
}
.nav-btn-primary:hover {
  background: #059669;
  color: white;
}
.nav-btn-danger {
  color: #f87171;
}
.nav-btn-danger:hover {
  background: rgba(248, 113, 113, 0.1);
  color: #fca5a5;
}

/* Page layout */
.page {
  max-width: 1152px;
  margin: 0 auto;
  padding: 32px 24px;
}

/* Section labels */
.section-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
  margin-top: 28px;
}
.section-title h2,
.section-title .h2 {
  font-size: 13px;
  font-weight: 600;
  color: #cbd5e1;
  letter-spacing: 0.02em;
}
.section-title .meta {
  font-size: 11px;
  color: var(--text-muted);
}
.section-title:first-child {
  margin-top: 0;
}

/* Cards */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.card-tight {
  padding: 14px 16px;
}
.card-pad {
  padding: 20px;
}
.card-hover {
  transition: border-color 0.15s, background 0.15s;
}
.card-hover:hover {
  border-color: var(--border-strong);
}

/* Stats */
.stat-label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}
.stat-value {
  font-size: 22px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.stat-value.large {
  font-size: 28px;
}

/* Period buttons */
.period-group {
  display: flex;
  gap: 2px;
  background: var(--bg-surface);
  border-radius: 8px;
  padding: 4px;
  border: 1px solid var(--border);
}
.period-btn {
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  transition: all 0.15s;
}
.period-btn:hover {
  color: #e2e8f0;
}
.period-btn.active {
  background: var(--accent-bg);
  color: var(--accent-strong);
}

/* Range picker */
.range-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface);
  border-radius: 8px;
  padding: 4px 12px;
  border: 1px solid var(--border);
}
.range-picker input[type=date] {
  background: transparent;
  border: 0;
  color: var(--text-primary);
  font-size: 12px;
  width: 110px;
  color-scheme: dark;
}
.range-picker input[type=date]:focus { outline: none; }

/* Chips */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
}
.chip-streak {
  background: rgba(249, 115, 22, 0.1);
  color: #fb923c;
  border: 1px solid rgba(249, 115, 22, 0.2);
}
.chip-admin {
  background: rgba(168, 85, 247, 0.15);
  color: #d8b4fe;
}

/* Forms */
.input {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text-primary);
  font-size: 14px;
  transition: border-color 0.15s;
}
.input:focus {
  outline: none;
  border-color: var(--accent);
}
.label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  display: block;
  font-weight: 500;
}

/* Buttons */
.btn {
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.btn-primary {
  background: var(--accent);
  color: white;
}
.btn-primary:hover { background: #059669; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--border-strong);
}
.btn-danger {
  background: rgba(220, 38, 38, 0.15);
  color: #fca5a5;
  border: 1px solid rgba(220, 38, 38, 0.3);
}
.btn-danger:hover { background: rgba(220, 38, 38, 0.25); }

/* Tables */
.data-table {
  width: 100%;
  font-size: 14px;
  border-collapse: collapse;
}
.data-table thead th {
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  cursor: default;
  user-select: none;
}
.data-table thead th.sortable {
  cursor: pointer;
}
.data-table thead th.sortable:hover { color: var(--text-secondary); }
.data-table tbody td {
  padding: 12px 20px;
  border-bottom: 1px solid rgba(31, 41, 55, 0.5);
}
.data-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}
.data-table tbody tr:last-child td {
  border-bottom: 0;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}
.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  max-width: 480px;
  width: calc(100% - 32px);
}
.modal h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
}

/* Misc */
.divider {
  height: 1px;
  background: var(--border);
  margin: 16px 0;
}
.muted { color: var(--text-muted); }
.text-accent { color: var(--accent-strong); }

/* Bar component for tool / model rows */
.bar-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 0;
}
.bar-row .bar-label {
  width: 96px;
  font-size: 13px;
  color: #cbd5e1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.bar-row .bar-track {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 9999px;
  overflow: hidden;
}
.bar-row .bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 9999px;
}
.bar-row .bar-value {
  width: 48px;
  text-align: right;
  font-size: 12px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

/* Heatmap */
.heatmap {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.heatmap-row {
  display: flex;
  align-items: center;
  gap: 2px;
}
.heatmap-row .day {
  font-size: 10px;
  color: var(--text-muted);
  width: 16px;
}
.heatmap-cell {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* Auth pages (login / register) */
.auth-wrap {
  max-width: 400px;
  margin: 80px auto;
  padding: 0 24px;
}
.auth-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
}

@media (max-width: 768px) {
  .topnav-inner { padding: 0 16px; }
  .page { padding: 24px 16px; }
  .stat-value { font-size: 18px; }
}