/* ========================================
   Base CSS - Variables, Reset & Typography
   ======================================== */

:root {
  /* Color Palette - Healing Green */
  --frog-50: #ECFDF5;
  --frog-100: #D1FAE5;
  --frog-200: #A7F3D0;
  --frog-300: #6EE7B7;
  --frog-400: #34D399;
  --frog-500: #10B981;
  --frog-600: #059669;
  --frog-700: #047857;
  --frog-800: #065F46;
  --frog-900: #064E3B;
  
  /* Sage Green */
  --sage-50: #F5FBF8;
  --sage-100: #E6F4ED;
  --sage-200: #C3E4D4;
  --sage-300: #9DD4BC;
  --sage-400: #6FC09E;
  --sage-500: #4BA882;
  --sage-600: #3D8D6C;
  --sage-700: #326F56;
  
  /* Forest Green */
  --forest-700: #2D5A45;
  --forest-800: #234838;
  --forest-900: #1A3629;
  
  /* Warm Tones */
  --cream: #FEFDF9;
  --cream-warm: #FCF9F3;
  --sand: #F7F3EB;
  --gold-100: #FEF9E7;
  --gold-400: #FBBF24;
  
  /* Neutrals */
  --white: #FFFFFF;
  --gray-50: #FAFAF9;
  --gray-100: #F5F5F4;
  --gray-200: #E7E5E4;
  --gray-300: #D6D3D1;
  --gray-400: #A8A29E;
  --gray-500: #78716C;
  --gray-600: #57534E;
  --gray-700: #44403C;
  --gray-800: #292524;
  --gray-900: #1C1917;
  
  /* Typography */
  --font-display: 'Quicksand', 'Nunito', sans-serif;
  --font-body: 'Nunito', 'Quicksand', sans-serif;
  --font-cn: 'Noto Sans SC', 'PingFang SC', sans-serif;
  
  /* Border Radius */
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-2xl: 36px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(16, 185, 129, 0.06);
  --shadow-md: 0 4px 16px rgba(16, 185, 129, 0.08);
  --shadow-lg: 0 8px 32px rgba(16, 185, 129, 0.1);
  --shadow-xl: 0 12px 48px rgba(16, 185, 129, 0.12);
  
  /* Animation */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration: 0.35s;
  --duration-slow: 0.5s;
}

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

html {
  font-size: 15px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--cream);
  color: var(--gray-700);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Chinese font support */
html[lang="zh-CN"] body,
html[lang="zh-CN"] h1,
html[lang="zh-CN"] h2,
html[lang="zh-CN"] h3,
html[lang="zh-CN"] h4,
html[lang="zh-CN"] p,
html[lang="zh-CN"] span,
html[lang="zh-CN"] a {
  font-family: var(--font-cn), var(--font-body);
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: all var(--duration) var(--ease-out);
}

ul, ol {
  list-style: none;
}

/* Selection */
::selection { 
  background: var(--frog-200); 
  color: var(--forest-900); 
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--cream); }
::-webkit-scrollbar-thumb { 
  background: var(--sage-300); 
  border-radius: var(--radius-full); 
}
::-webkit-scrollbar-thumb:hover { background: var(--sage-400); }

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

a:focus-visible, 
button:focus-visible {
  outline: 3px solid var(--frog-400);
  outline-offset: 3px;
}