/* ── Design Tokens ──────────────────────────────────── */

:root {
  /* Core palette */
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #242736;
  --border: #2e3247;
  --text: #e1e4ed;
  --text-dim: #8b8fa7;
  --accent: #6c8cff;
  --accent-dim: #4a5e99;
  --green: #4ade80;
  --yellow: #facc15;
  --orange: #fb923c;
  --red: #f87171;

  /* Interaction states */
  --accent-hover: #5a7ae6;
  --on-accent: #fff;
  --green-dark: #238636;

  /* Semantic aliases (used by chat CSS) */
  --text-secondary: var(--text-dim);
  --bg-surface: var(--surface);
  --bg-input: var(--bg);
  --bg-card: var(--surface);
  --bg-secondary: var(--surface);

  /* Transparent variants */
  --accent-subtle: color-mix(in srgb, var(--accent) 10%, transparent);
  --accent-muted: color-mix(in srgb, var(--accent) 15%, transparent);
  --green-subtle: color-mix(in srgb, var(--green) 10%, transparent);
  --green-muted: color-mix(in srgb, var(--green) 15%, transparent);
  --red-subtle: color-mix(in srgb, var(--red) 10%, transparent);
  --red-muted: color-mix(in srgb, var(--red) 15%, transparent);
  --yellow-subtle: color-mix(in srgb, var(--yellow) 12%, transparent);
  --orange-subtle: color-mix(in srgb, var(--orange) 12%, transparent);
  --overlay: rgba(0, 0, 0, 0.6);

  /* Radius scale */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-pill: 9999px;

  /* Typography */
  --font-mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ── Light Theme (system preference) ─────────────────── */

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg: #ffffff;
    --surface: #f4f5f7;
    --surface2: #e8eaed;
    --border: #d1d5db;
    --text: #1a1d27;
    --text-dim: #6b7280;
    --accent: #4a6cf7;
    --accent-dim: #7c96f0;
    --accent-hover: #3b5de8;
    --on-accent: #fff;
    --green: #16a34a;
    --green-dark: #15803d;
    --yellow: #ca8a04;
    --orange: #ea580c;
    --red: #dc2626;
    --overlay: rgba(0, 0, 0, 0.4);
  }
}

/* ── Explicit Theme Overrides ────────────────────────── */

[data-theme="light"] {
  --bg: #ffffff;
  --surface: #f4f5f7;
  --surface2: #e8eaed;
  --border: #d1d5db;
  --text: #1a1d27;
  --text-dim: #6b7280;
  --accent: #4a6cf7;
  --accent-dim: #7c96f0;
  --accent-hover: #3b5de8;
  --on-accent: #fff;
  --green: #16a34a;
  --green-dark: #15803d;
  --yellow: #ca8a04;
  --orange: #ea580c;
  --red: #dc2626;
  --overlay: rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #242736;
  --border: #2e3247;
  --text: #e1e4ed;
  --text-dim: #8b8fa7;
  --accent: #6c8cff;
  --accent-dim: #4a5e99;
  --accent-hover: #5a7ae6;
  --on-accent: #fff;
  --green: #4ade80;
  --green-dark: #238636;
  --yellow: #facc15;
  --orange: #fb923c;
  --red: #f87171;
  --overlay: rgba(0, 0, 0, 0.6);
}

/* ── Theme Toggle Icons ──────────────────────────────── */

.theme-icon-sun { display: inline; }
.theme-icon-moon { display: none; }

[data-theme="light"] .theme-icon-sun { display: none; }
[data-theme="light"] .theme-icon-moon { display: inline; }

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .theme-icon-sun { display: none; }
  :root:not([data-theme]) .theme-icon-moon { display: inline; }
}

/* ── Reset ──────────────────────────────────────────── */

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── Navigation ─────────────────────────────────────── */

.site-nav {
  padding: 14px 32px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--bg);
}

.site-nav-left {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav-logo {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--text);
}

.site-nav-logo span { color: var(--accent); }

.site-nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 12px;
  border-radius: var(--radius);
  transition: color 0.15s, background 0.15s;
}

.site-nav-links a:hover {
  color: var(--text);
  background: var(--surface);
}

.site-nav-links a.active {
  color: var(--accent);
  background: var(--accent-subtle);
}

.site-nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-nav-user {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text);
}

.site-nav-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}

.site-nav-btn {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 14px;
  font-size: 13px;
  font-family: var(--font-sans);
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.site-nav-btn:hover {
  border-color: var(--accent-dim);
  background: var(--surface2);
}

.site-nav-btn.primary {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}

.site-nav-btn.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

/* ── Nav Dropdown ──────────────────────────────────── */

.site-nav-dropdown {
  position: relative;
  display: flex;
  align-items: center;
}

.site-nav-dropdown-trigger {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 12px;
  border-radius: var(--radius);
  transition: color 0.15s, background 0.15s;
  cursor: pointer;
  user-select: none;
}

.site-nav-dropdown-trigger::after {
  content: ' \25BE';
  font-size: 10px;
}

.site-nav-dropdown-trigger:hover {
  color: var(--text);
  background: var(--surface);
}

.site-nav-dropdown-trigger.active {
  color: var(--accent);
  background: var(--accent-subtle);
}

.site-nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 0;
  min-width: 180px;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.site-nav-dropdown:hover .site-nav-dropdown-menu,
.site-nav-dropdown:focus-within .site-nav-dropdown-menu {
  display: block;
}

.site-nav-dropdown-menu a {
  display: block;
  padding: 8px 16px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: background 0.1s, color 0.1s;
}

.site-nav-dropdown-menu a:hover {
  background: var(--surface2);
  color: var(--text);
}

.site-nav-dropdown-sep {
  border-top: 1px solid var(--border);
  margin: 4px 0;
}

/* ── Offline Banner ─────────────────────────────────── */

.offline-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--orange);
  color: var(--surface);
  font-size: 13px;
  font-weight: 600;
  text-align: center;
}

.offline-banner span {
  font-weight: 400;
  opacity: 0.8;
}

/* ── Beta Banner ───────────────────────────────────── */

.beta-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--yellow-subtle);
  border-bottom: 1px solid color-mix(in srgb, var(--yellow) 30%, transparent);
  color: var(--text);
  font-size: 13px;
  text-align: center;
}

.beta-badge {
  display: inline-block;
  padding: 1px 6px;
  background: var(--yellow);
  color: var(--bg);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

.beta-banner a {
  color: var(--accent);
  text-decoration: underline;
}

/* ── Shared Utilities ───────────────────────────────── */

.label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

/* ── Shared Components ─────────────────────────────────── */

.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
  border: none;
  border-radius: var(--radius);
  padding: 10px 20px;
  font-size: 14px;
  font-family: var(--font-sans);
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 20px;
  font-size: 14px;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.btn-secondary:hover { border-color: var(--accent-dim); background: var(--surface2); }

.form-input {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 15px;
  font-family: var(--font-sans);
}

.form-input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.form-select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-size: 14px;
  font-family: var(--font-sans);
  cursor: pointer;
}

.form-select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.empty-state {
  text-align: center;
  padding: 48px 32px;
  color: var(--text-dim);
}

.empty-state p {
  font-size: 15px;
  margin-bottom: 8px;
}

.empty-text {
  color: var(--text-dim);
  font-size: 14px;
  font-style: italic;
}

/* ── Responsive: Tablet ───────────────────────────────── */

@media (max-width: 768px) {
  .site-nav {
    padding: 12px 16px;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
  }

  .site-nav-left {
    flex-direction: column;
    align-items: center;
    gap: 10px;
    width: 100%;
  }

  .site-nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 2px;
  }

  .site-nav-links a {
    font-size: 13px;
    padding: 5px 10px;
  }

  .site-nav-right {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .site-nav-user {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* ── Responsive: Small Phone ──────────────────────────── */

@media (max-width: 480px) {
  .site-nav {
    padding: 10px 12px;
    gap: 6px;
  }

  .site-nav-logo {
    font-size: 16px;
  }

  .site-nav-links a {
    font-size: 12px;
    padding: 4px 8px;
  }

  .site-nav-btn {
    padding: 5px 10px;
    font-size: 12px;
  }

  .site-nav-user {
    font-size: 13px;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
  }
}