/* ============================================
   猜趣社 GuessJoy - Design System
   Inspired by Nike App Design Language
   ============================================ */

/* CSS Custom Properties - Design Tokens */
:root {
  /* === Color Palette === */
  /* Primary - 品牌橙红（来自Nike截图的红色调） */
  --color-primary: #FA5723;
  --color-primary-light: #FF7A50;
  --color-primary-dark: #E04010;
  --color-primary-bg: rgba(250, 87, 35, 0.08);
  --color-primary-bg-hover: rgba(250, 87, 35, 0.12);

  /* Secondary */
  --color-secondary: #111111;
  --color-secondary-light: #333333;

  /* Neutral */
  --color-white: #FFFFFF;
  --color-gray-50: #FAFAFA;
  --color-gray-100: #F5F5F5;
  --color-gray-200: #EEEEEE;
  --color-gray-300: #E0E0E0;
  --color-gray-400: #BDBDBD;
  --color-gray-500: #9E9E9E;
  --color-gray-600: #757575;
  --color-gray-700: #616161;
  --color-gray-800: #424242;
  --color-gray-900: #111111;

  /* Semantic Colors */
  --color-success: #4CAF50;
  --color-success-bg: rgba(76, 175, 80, 0.1);
  --color-warning: #FF9800;
  --color-warning-bg: rgba(255, 152, 0, 0.1);
  --color-error: #F44336;
  --color-error-bg: rgba(244, 67, 54, 0.1);
  --color-info: #2196F3;
  --color-info-bg: rgba(33, 150, 243, 0.1);

  /* Badge Colors */
  --badge-brand: linear-gradient(135deg, #FFD700, #FFA000);
  --badge-user: linear-gradient(135deg, #42A5F5, #1565C0);
  --badge-merchant: linear-gradient(135deg, #66BB6A, #2E7D32);
  --badge-recommend: linear-gradient(135deg, #AB47BC, #6A1B9A);

  /* === Typography === */
  --font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans GB', 'Microsoft YaHei', 'Inter', sans-serif;
  
  /* Font Sizes - Nike uses clean, bold typography */
  --text-xs: 10px;
  --text-sm: 12px;
  --text-base: 14px;
  --text-md: 16px;
  --text-lg: 18px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 28px;
  --text-4xl: 32px;

  /* Font Weights */
  --font-light: 300;
  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-black: 900;

  /* Line Heights */
  --leading-tight: 1.2;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* === Spacing - 4px base grid === */
  --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;

  /* === Border Radius (Nike uses subtle rounds) === */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;

  /* === Shadows (minimal, like Nike) === */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);
  --shadow-xl: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-card: 0 1px 4px rgba(0,0,0,0.06);

  /* === Layout === */
  --max-width: 430px;
  --nav-height: 56px;
  --tab-bar-height: 60px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --header-height: 52px;

  /* === Transitions === */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
  --transition-spring: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* === Z-Index Scale === */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
  --z-ai-assistant: 600;
}

/* === Global Reset & Base Styles === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-gray-900);
  background-color: var(--color-white);
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-bottom: calc(var(--tab-bar-height) + var(--safe-bottom) + 10px);
}

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

a {
  text-decoration: none;
  color: inherit;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  outline: none;
  border: none;
}

ul, ol {
  list-style: none;
}

/* === Typography Utilities === */
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-md { font-size: var(--text-md); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }

.font-light { font-weight: var(--font-light); }
.font-regular { font-weight: var(--font-regular); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }
.font-black { font-weight: var(--font-black); }

.text-primary { color: var(--color-primary); }
.text-gray { color: var(--color-gray-600); }
.text-light { color: var(--color-gray-500); }
.text-dark { color: var(--color-gray-900); }
.text-white { color: var(--color-white); }

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-ellipsis {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.text-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* === Spacing Utilities === */
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }

/* === Flex Utilities === */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.flex-1 { flex: 1; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

/* === Grid Utilities === */
.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* === Hide/Show === */
.hidden { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 0; height: 0; }
.scroll-x {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.scroll-x::-webkit-scrollbar { display: none; }

/* === Animations === */
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}
@keyframes slideDown {
  from { transform: translateY(-100%); }
  to { transform: translateY(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes sparkle {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.1); }
}

.animate-fadeIn { animation: fadeIn var(--transition-normal); }
.animate-fadeInUp { animation: fadeInUp 0.4s ease-out; }
.animate-slideUp { animation: slideUp 0.3s ease-out; }
.animate-scaleIn { animation: scaleIn var(--transition-spring); }

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