/* ============================================================
   DG Tech AI — brand stylesheet for DGbot public pages
   Source of truth: .claude/skills/DG Tech AI Design System
   Dark-first (#0B1020); light theme is an equal citizen.
   Fonts: Plus Jakarta Sans (display) · Inter (body) · JetBrains Mono (labels)
   ============================================================ */

:root {
  /* Brand */
  --dg-blue: #2563EB;
  --dg-cyan: #06B6D4;
  --dg-violet: #8B5CF6;
  --dg-logo-cyan: #02CAFC;
  --dg-logo-blue: #4892FC;
  --dg-logo-violet: #8E5AFB;
  /* Semantic */
  --dg-success: #10B981;
  --dg-warning: #F59E0B;
  --dg-danger: #EF4444;
  --dg-info: #06B6D4;
  /* Gradients — UI is 2-stop, brand is 3-stop, always 135° */
  --dg-gradient: linear-gradient(135deg, #2563EB, #06B6D4);
  --dg-gradient-brand: linear-gradient(135deg, #2563EB 0%, #06B6D4 50%, #8B5CF6 100%);
  /* Type */
  --font-display: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --tracking-caps: 0.18em;
  /* Geometry — strict 8px grid */
  --r-chip: 8px;
  --r-input: 10px;
  --r-btn: 12px;
  --r-card: 16px;
  --r-lg: 20px;
  --r-pill: 999px;
  /* Motion */
  --dur-fast: 200ms;
  --dur: 250ms;
  --dur-slow: 350ms;
  --ease: ease-in-out;
  --focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.35);
}

/* ---------- Dark surfaces (default) ---------- */
:root,
:root[data-theme="dark"] {
  --bg: #0B1020;
  --surface: #182336;
  --surface-2: #0D1428;
  --border: #22304A;
  --border-strong: #2C3B57;
  --heading: #F8FAFC;
  --body: #CBD5E1;
  --muted: #94A3B8;
  --faint: #64748B;
  --accent-text: #4892FC;
  --cyan-text: #22D3EE;
  --success-text: #34D399;
  --warning-text: #FBBF24;
  --danger-text: #F87171;
  --monogram: #F8FAFC;
  --hover-tint: rgba(248, 250, 252, 0.07);
  --input-bg: #0D1428;
  --btn2-bg: transparent;
  --btn2-border: rgba(248, 250, 252, 0.22);
  --btn2-text: #F8FAFC;
  --nav-bg: rgba(11, 16, 32, 0.78);
  --shadow-card: none;
  --shadow-pop: 0 20px 50px rgba(0, 0, 0, 0.22);
  --mesh:
    radial-gradient(1000px 520px at 12% -8%, rgba(37, 99, 235, 0.16), transparent 60%),
    radial-gradient(760px 440px at 88% -4%, rgba(6, 182, 212, 0.10), transparent 60%),
    radial-gradient(680px 440px at 50% 104%, rgba(139, 92, 246, 0.07), transparent 60%);
}

/* ---------- Light surfaces ---------- */
:root[data-theme="light"] {
  --bg: #F8FAFC;
  --surface: #FFFFFF;
  --surface-2: #F1F5F9;
  --border: #E2E8F0;
  --border-strong: #CBD5E1;
  --heading: #0B1020;
  --body: #334155;
  --muted: #64748B;
  --faint: #94A3B8;
  --accent-text: #2563EB;
  --cyan-text: #0891B2;
  --success-text: #059669;
  --warning-text: #B45309;
  --danger-text: #DC2626;
  --monogram: #2E3A4E;
  --hover-tint: rgba(11, 16, 32, 0.05);
  --input-bg: #FFFFFF;
  --btn2-bg: #FFFFFF;
  --btn2-border: #CBD5E1;
  --btn2-text: #0B1020;
  --nav-bg: rgba(248, 250, 252, 0.85);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-pop: 0 8px 30px rgba(0, 0, 0, 0.15);
  --mesh:
    radial-gradient(1000px 520px at 12% -8%, rgba(37, 99, 235, 0.07), transparent 60%),
    radial-gradient(760px 440px at 88% -4%, rgba(6, 182, 212, 0.06), transparent 60%),
    radial-gradient(680px 440px at 50% 104%, rgba(139, 92, 246, 0.05), transparent 60%);
}

/* ---------- Base ---------- */
.dg-body {
  background: var(--bg);
  color: var(--body);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}
.dg-body ::selection { background: rgba(37, 99, 235, 0.35); }
/* Mesh must not tile: body is viewport-height while the page is taller, and
   backgrounds repeat by default. Paint the mesh on a fixed layer behind the
   content instead — background-attachment: fixed is unreliable (iOS Safari,
   headless capture). */
.dg-mesh { background: var(--bg); position: relative; }
.dg-mesh::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: var(--mesh);
}

/* Text / surface utilities */
.t-heading { color: var(--heading); }
.t-body    { color: var(--body); }
.t-muted   { color: var(--muted); }
.t-faint   { color: var(--faint); }
.t-accent  { color: var(--accent-text); }
.t-cyan    { color: var(--cyan-text); }
.t-success { color: var(--success-text); }
.t-warning { color: var(--warning-text); }
.bg-page   { background: var(--bg); }
.bg-card   { background: var(--surface); }
.bg-card2  { background: var(--surface-2); }
.bd        { border-color: var(--border); }
.bd-strong { border-color: var(--border-strong); }

.font-display { font-family: var(--font-display); }
.font-mono    { font-family: var(--font-mono); }

/* Gradient text — one gradient moment per screen */
.dg-grad-text {
  background: var(--dg-gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Letterspaced uppercase mono eyebrow */
.dg-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--muted);
}
.dg-eyebrow .idx { color: var(--accent-text); }

/* ---------- Buttons ---------- */
.dg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 24px;
  border: 0;
  border-radius: var(--r-btn);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: opacity var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.dg-btn-sm { min-height: 36px; padding: 0 16px; font-size: 13px; border-radius: 10px; }
.dg-btn-lg { min-height: 52px; padding: 0 28px; font-size: 16px; }
.dg-btn-block { width: 100%; }

.dg-btn-primary { background: var(--dg-gradient); color: #fff; }
.dg-btn-primary:hover { opacity: 0.88; }
.dg-btn-primary:disabled { opacity: 0.35; cursor: not-allowed; }

.dg-btn-secondary {
  background: var(--btn2-bg);
  border: 1px solid var(--btn2-border);
  color: var(--btn2-text);
}
.dg-btn-secondary:hover { background: var(--hover-tint); }
.dg-btn-secondary:disabled { opacity: 0.4; cursor: not-allowed; }

.dg-btn-ghost { background: transparent; color: var(--body); }
.dg-btn-ghost:hover { background: var(--hover-tint); }

/* ---------- Cards ---------- */
.dg-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
}
.dg-card-hover { transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease); }
.dg-card-hover:hover { border-color: var(--border-strong); }

/* ---------- Forms ---------- */
.dg-label {
  display: block;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--heading);
  margin-bottom: 8px;
}
.dg-input {
  display: block;
  width: 100%;
  min-height: 44px;
  padding: 10px 14px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--r-input);
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--heading);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.dg-input::placeholder { color: var(--faint); }
.dg-input:focus {
  outline: none;
  border-color: var(--dg-blue);
  box-shadow: var(--focus-ring);
}
.dg-input:disabled { opacity: 0.5; cursor: not-allowed; }

/* Error alert */
.dg-alert-error {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--r-input);
  background: rgba(239, 68, 68, 0.10);
  border: 1px solid rgba(239, 68, 68, 0.30);
  color: var(--danger-text);
  font-size: 13px;
}

/* ---------- Chips & pills ---------- */
.dg-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--r-chip);
  background: var(--surface);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}
.dg-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
}
.dg-pill-accent  { background: rgba(37, 99, 235, 0.12);  border: 1px solid rgba(37, 99, 235, 0.32);  color: var(--accent-text); }
.dg-pill-info    { background: rgba(6, 182, 212, 0.10);  border: 1px solid rgba(6, 182, 212, 0.30);  color: var(--cyan-text); }
.dg-pill-success { background: rgba(16, 185, 129, 0.10); border: 1px solid rgba(16, 185, 129, 0.30); color: var(--success-text); }
.dg-pill-warning { background: rgba(245, 158, 11, 0.10); border: 1px solid rgba(245, 158, 11, 0.32); color: var(--warning-text); }

/* ---------- Nav ---------- */
.dg-nav {
  background: var(--nav-bg);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.dg-navlink {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color var(--dur-fast) var(--ease);
}
.dg-navlink:hover { color: var(--heading); }

/* Wordmark next to the mark */
.dg-wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--heading);
  line-height: 1;
}

/* ---------- Theme toggle ---------- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--r-pill);
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.theme-toggle:hover { background: var(--hover-tint); color: var(--heading); }
:root[data-theme="dark"]  .theme-toggle .icon-sun  { display: block; }
:root[data-theme="dark"]  .theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun  { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* ---------- Focus ---------- */
.dg-body :where(a, button, summary, input, select, textarea, [role="tab"]):focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: 8px;
}

/* ---------- Motion ---------- */
@keyframes dgFadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.dg-fade-up { animation: dgFadeUp var(--dur-slow) var(--ease) both; }

@keyframes dgSpin { to { transform: rotate(360deg); } }
.dg-spin { animation: dgSpin 0.8s linear infinite; }

@keyframes dgPulse { 0%, 100% { opacity: 0.5; } 50% { opacity: 1; } }
.dg-pulse { animation: dgPulse 1.6s var(--ease) infinite; }

@media (prefers-reduced-motion: reduce) {
  .dg-fade-up, .dg-pulse { animation: none !important; }
}