/* 春方堂 · 新中式雅致 Design System
   主题: 明/暗双主题 + 玻璃拟态 + 微动效
   配色: 墨色 | 宣纸米 | 金铜 | 雅绿
   ============================================ */

/* ---------- CSS Custom Properties (Light Theme) ---------- */
:root {
  /* === 品牌色 === */
  --color-primary: #2c2c2c;
  --color-primary-light: #4a4a4a;
  --color-primary-dark: #1a1a1a;
  --color-accent: #c9a962;
  --color-accent-light: #d9c17a;
  --color-jade: #5b7e6b;
  --color-jade-light: #7a9e8b;

  /* Surfaces */
  --bg-primary: #f9f7f2;
  --bg-secondary: #f0ece3;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.6);

  /* Text */
  --text-primary: #2c2c2c;
  --text-secondary: #6b6860;
  --text-muted: #9a958b;
  --text-inverse: #f9f7f2;

  /* Borders & Dividers */
  --border-light: rgba(44, 44, 44, 0.08);
  --border-medium: rgba(44, 44, 44, 0.12);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(44, 44, 44, 0.06);
  --shadow-md: 0 4px 20px rgba(44, 44, 44, 0.08);
  --shadow-lg: 0 12px 40px rgba(44, 44, 44, 0.1);
  --shadow-xl: 0 20px 60px rgba(44, 44, 44, 0.12);
  --shadow-glow: 0 0 30px rgba(201, 169, 98, 0.2);

  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-blur: 20px;
  --glass-saturate: 180%;

  /* === Typography === */
  --font-heading: 'Playfair Display', 'Noto Serif SC', serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;

  /* Scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  --text-7xl: 4.5rem;

  /* Letter Spacing */
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.05em;
  --tracking-wider: 0.1em;
  --tracking-widest: 0.2em;

  /* Line Height */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* === Spacing === */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* === Border Radius === */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;

  /* === Transitions === */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --duration-slower: 800ms;

  /* === Layout === */
  --max-width: 1280px;
  --nav-height: 72px;

  /* === Z-Index === */
  --z-dropdown: 50;
  --z-sticky: 100;
  --z-overlay: 200;
  --z-modal: 300;
  --z-toast: 400;
}

/* ---------- Dark Theme ---------- */
[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #242424;
  --bg-card: #2c2c2c;
  --bg-glass: rgba(44, 44, 44, 0.6);

  --text-primary: #f5f2eb;
  --text-secondary: #b8b2a5;
  --text-muted: #7a756b;
  --text-inverse: #1a1a1a;

  --border-light: rgba(245, 242, 235, 0.08);
  --border-medium: rgba(245, 242, 235, 0.12);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(201, 169, 98, 0.15);

  --glass-bg: rgba(44, 44, 44, 0.55);
  --glass-border: rgba(255, 255, 255, 0.06);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition:
    background-color var(--duration-slow) var(--ease-out-expo),
    color var(--duration-slow) var(--ease-out-expo);
  overflow-x: hidden;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
}

h1 { font-size: var(--text-6xl); font-weight: 700; }
h2 { font-size: var(--text-5xl); font-weight: 600; }
h3 { font-size: var(--text-3xl); font-weight: 600; }
h4 { font-size: var(--text-2xl); font-weight: 600; }
h5 { font-size: var(--text-xl); font-weight: 500; }

p {
  color: var(--text-secondary);
  max-width: 65ch;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out-expo);
}

a:hover {
  color: var(--color-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- Utility Classes ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-8);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary-light);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* ---------- Selection ---------- */
::selection {
  background-color: var(--color-primary-light);
  color: var(--text-inverse);
}

/* ---------- Glass Effect ---------- */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  border: 1px solid var(--glass-border);
}

.glass-strong {
  background: var(--glass-bg);
  backdrop-filter: blur(40px) saturate(200%);
  -webkit-backdrop-filter: blur(40px) saturate(200%);
  border: 1px solid var(--glass-border);
}

/* ---------- Animated Elements ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slower) var(--ease-out-expo),
    transform var(--duration-slower) var(--ease-out-expo);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Magnetic Hover */
.magnetic {
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.magnetic:hover {
  transform: scale(1.03) translateY(-2px);
}

/* Floating Animation */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.animate-float {
  animation: float 4s var(--ease-in-out) infinite;
}

/* Pulse Glow */
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(196, 139, 125, 0.1); }
  50% { box-shadow: 0 0 40px rgba(196, 139, 125, 0.25); }
}

.animate-pulse-glow {
  animation: pulse-glow 3s var(--ease-in-out) infinite;
}

/* Shimmer */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

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

/* Gradient Text */
.gradient-text {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 50%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Divider */
.divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  margin: var(--space-4) 0;
}

.divider.centered {
  margin-left: auto;
  margin-right: auto;
}

/* Section Padding */
.section {
  padding: var(--space-32) 0;
}

.section-sm {
  padding: var(--space-16) 0;
}

@media (max-width: 768px) {
  .section {
    padding: var(--space-16) 0;
  }
  .section-sm {
    padding: var(--space-10) 0;
  }
}