/* ============================================================
   云狐文档 Pro - Design System 2026
   参考：Stripe, Vercel, Linear, Supabase, Cloudflare
   ============================================================ */

/* ===== CSS Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

/* ===== Root Variables - Dark Mode (Default) ===== */
:root {
  /* Primary - Indigo to Purple */
  --primary: #6366F1;
  --primary-hover: #4F46E5;
  --primary-light: #818CF8;
  --primary-dark: #4338CA;
  --primary-50: rgba(99,102,241,0.05);
  --primary-100: rgba(99,102,241,0.1);
  --primary-200: rgba(99,102,241,0.2);

  /* Functional Colors */
  --success: #10B981;
  --success-light: #34D399;
  --success-bg: rgba(16,185,129,0.12);
  --success-border: rgba(16,185,129,0.25);

  --warning: #F59E0B;
  --warning-light: #FBBF24;
  --warning-bg: rgba(245,158,11,0.12);
  --warning-border: rgba(245,158,11,0.25);

  --danger: #EF4444;
  --danger-light: #F87171;
  --danger-bg: rgba(239,68,68,0.12);
  --danger-border: rgba(239,68,68,0.25);

  --info: #3B82F6;
  --info-light: #60A5FA;
  --info-bg: rgba(59,130,246,0.12);

  /* Neutral - Dark Theme */
  --bg-body: #0B0F19;
  --bg-surface: #111827;
  --bg-surface-elevated: #1F2937;
  --bg-surface-hover: #374151;
  --bg-input: #1F2937;
  --bg-sidebar: #0B0F19;
  --bg-header: rgba(11,15,25,0.8);

  --text-primary: #F9FAFB;
  --text-secondary: #9CA3AF;
  --text-muted: #6B7280;
  --text-inverse: #0B0F19;

  --border: rgba(148,163,184,0.12);
  --border-hover: rgba(148,163,184,0.2);
  --border-focus: rgba(99,102,241,0.5);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6366F1 0%, #8B5CF6 50%, #A855F7 100%);
  --gradient-surface: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, transparent 100%);
  --gradient-glass: linear-gradient(135deg, rgba(99,102,241,0.08) 0%, rgba(168,85,247,0.04) 100%);
  --gradient-hero: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99,102,241,0.15), transparent);

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4), 0 4px 6px -4px rgba(0,0,0,0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5), 0 8px 10px -6px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 20px rgba(99,102,241,0.25);
  --shadow-glow-lg: 0 0 40px rgba(99,102,241,0.35);
  --shadow-inner: inset 0 1px 0 rgba(255,255,255,0.05);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

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

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-bounce: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-tooltip: 400;
  --z-toast: 500;
}

/* ===== Light Mode ===== */
[data-theme="light"] {
  --bg-body: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #F1F5F9;
  --bg-surface-hover: #E2E8F0;
  --bg-input: #F8FAFC;
  --bg-sidebar: #FFFFFF;
  --bg-header: rgba(255,255,255,0.85);

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --text-inverse: #FFFFFF;

  --border: rgba(15,23,42,0.08);
  --border-hover: rgba(15,23,42,0.15);

  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
}

/* ===== Base Styles ===== */
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 15px;
  overflow-x: hidden;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: 48px; }
h2 { font-size: 36px; }
h3 { font-size: 24px; }
h4 { font-size: 18px; }
h5 { font-size: 16px; }
h6 { font-size: 14px; }

.text-display { font-size: 64px; font-weight: 700; line-height: 1.1; letter-spacing: -0.03em; }
.text-xl { font-size: 20px; }
.text-lg { font-size: 18px; }
.text-base { font-size: 15px; }
.text-sm { font-size: 13px; }
.text-xs { font-size: 12px; letter-spacing: 0.01em; }

.font-mono { font-family: var(--font-mono); }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Layout Utilities ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.container-narrow { max-width: 960px; }
.container-wide { max-width: 1400px; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ===== Spacing Utilities ===== */
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.py-20 { padding-top: var(--space-20); padding-bottom: var(--space-20); }
.py-16 { padding-top: var(--space-16); padding-bottom: var(--space-16); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: 14px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn-sm { height: 32px; padding: 0 var(--space-4); border-radius: var(--radius-md); font-size: 13px; }
.btn-md { height: 40px; padding: 0 var(--space-5); border-radius: var(--radius-md); }
.btn-lg { height: 48px; padding: 0 var(--space-6); border-radius: var(--radius-lg); font-size: 15px; }
.btn-xl { height: 56px; padding: 0 var(--space-8); border-radius: var(--radius-lg); font-size: 16px; }

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 1px 3px rgba(99,102,241,0.3), var(--shadow-inner);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow), 0 4px 12px rgba(99,102,241,0.3);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-inner);
}
.btn-secondary:hover { background: var(--bg-surface-hover); border-color: var(--border-hover); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover { background: var(--primary-50); color: var(--primary-light); }

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger-light);
  border: 1px solid var(--danger-border);
}
.btn-danger:hover { background: var(--danger); color: #fff; }

/* ===== Cards ===== */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-slow);
  box-shadow: var(--shadow-sm);
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-hover);
}

.card-glass {
  background: rgba(17,24,39,0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.06);
}

.card-gradient {
  background: var(--gradient-glass);
  border: 1px solid rgba(99,102,241,0.1);
}

/* ===== Forms ===== */
.form-control {
  width: 100%;
  height: 44px;
  padding: 0 var(--space-4);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 14px;
  transition: all var(--transition-fast);
}
.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
  outline: none;
}
.form-control::placeholder { color: var(--text-muted); }

textarea.form-control { height: auto; padding: var(--space-3) var(--space-4); min-height: 100px; resize: vertical; }

/* ===== Badges ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
}
.badge-default { background: rgba(148,163,184,0.1); color: var(--text-secondary); }
.badge-primary { background: var(--primary-100); color: var(--primary-light); }
.badge-success { background: var(--success-bg); color: var(--success-light); }
.badge-warning { background: var(--warning-bg); color: var(--warning-light); }
.badge-danger { background: var(--danger-bg); color: var(--danger-light); }

/* ===== Toggle Switch ===== */
.toggle-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; position: absolute; }
.toggle-slider {
  width: 44px;
  height: 24px;
  background: var(--bg-surface-hover);
  border-radius: var(--radius-full);
  position: relative;
  transition: all var(--transition-base);
  border: 1px solid var(--border);
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  background: #fff;
  border-radius: 50%;
  transition: all var(--transition-bounce);
  box-shadow: var(--shadow-sm);
}
.toggle-switch input:checked + .toggle-slider {
  background: var(--primary);
  border-color: var(--primary);
}
.toggle-switch input:checked + .toggle-slider::before {
  transform: translateY(-50%) translateX(20px);
}
.toggle-label { font-size: 14px; color: var(--text-secondary); }

/* ===== Glass Effect ===== */
.glass {
  background: rgba(17,24,39,0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.06);
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px rgba(99,102,241,0.2); }
  50% { box-shadow: 0 0 40px rgba(99,102,241,0.4); }
}

.animate-fade-in { animation: fadeIn 0.5s ease forwards; }
.animate-slide-up { animation: slideUp 0.6s ease forwards; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }
.animate-float { animation: float 3s ease-in-out infinite; }
.animate-glow { animation: glow 2s ease-in-out infinite; }

/* ===== Skeleton ===== */
.skeleton {
  background: linear-gradient(90deg, var(--bg-surface) 25%, var(--bg-surface-hover) 50%, var(--bg-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-surface-hover); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== Selection ===== */
::selection { background: rgba(99,102,241,0.3); color: var(--text-primary); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  h1 { font-size: 32px; }
  h2 { font-size: 26px; }
  h3 { font-size: 20px; }
  .text-display { font-size: 40px; }
  .container { padding: 0 var(--space-4); }
  .grid-cols-2, .grid-cols-3, .grid-cols-4 { grid-template-columns: 1fr; }
}