/* 现代化响应式 CSS 样式 */

/* 根变量定义 */
:root {
  /* 主色调 */
  --primary-color: #667eea;
  --primary-dark: #5a67d8;
  --secondary-color: #764ba2;
  --accent-color: #f093fb;
  
  /* 状态颜色 */
  --success-color: #48bb78;
  --warning-color: #ed8936;
  --error-color: #f56565;
  --info-color: #4299e1;
  
  /* 排名颜色 */
  --gold-color: #ffd700;
  --silver-color: #c0c0c0;
  --bronze-color: #cd7f32;
  
  /* 中性色 */
  --text-primary: #2d3748;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --bg-primary: #ffffff;
  --bg-secondary: #f7fafc;
  --bg-tertiary: #edf2f7;
  --border-color: #e2e8f0;
  
  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  
  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* 动画 */
  --transition-fast: 0.15s ease-out;
  --transition-base: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
  
  /* 间距 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
}

/* 深色模式变量 */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-muted: #a0aec0;
    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --bg-tertiary: #4a5568;
    --border-color: #4a5568;
  }
}

/* 基础重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--transition-base);
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  text-align: center;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-md);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Header */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: all var(--transition-base);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 0;
  gap: var(--space-xl);
}

.logo h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-xs);
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
}

.stats-overview {
  display: flex;
  gap: var(--space-xl);
}

.stat-item {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Navigation Tabs */
.nav-tabs {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 89px;
  z-index: 99;
}

.tabs-container {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-md) 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.tabs-container::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border: none;
  border-radius: var(--radius-lg);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  min-width: fit-content;
}

.tab-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

.tab-icon {
  font-size: 1rem;
}

/* Main Content */
.main {
  padding: var(--space-xl) 0 var(--space-2xl);
}

/* Search Section */
.search-section {
  margin-bottom: var(--space-xl);
}

.search-box {
  position: relative;
  max-width: 400px;
  margin: 0 auto;
}

.search-input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  background: var(--bg-primary);
  font-size: 1rem;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.search-clear {
  position: absolute;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: 50%;
  transition: all var(--transition-fast);
  opacity: 0;
  visibility: hidden;
}

.search-clear.visible {
  opacity: 1;
  visibility: visible;
}

.search-clear:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Leaderboard Section */
.leaderboard-section {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-xl) var(--space-xl) var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.section-info {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.leaderboard-container {
  max-height: 600px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

.leaderboard-container::-webkit-scrollbar {
  width: 6px;
}

.leaderboard-container::-webkit-scrollbar-track {
  background: transparent;
}

.leaderboard-container::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

/* Leaderboard Items */
.leaderboard-item {
  display: flex;
  align-items: center;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.leaderboard-item:hover {
  background: var(--bg-secondary);
  transform: translateX(2px);
}

.leaderboard-item:last-child {
  border-bottom: none;
}

.rank {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  font-size: 1.25rem;
  font-weight: 700;
  margin-right: var(--space-lg);
  flex-shrink: 0;
}

.rank.gold {
  background: linear-gradient(135deg, var(--gold-color), #ffed4e);
  color: #975a16;
}

.rank.silver {
  background: linear-gradient(135deg, var(--silver-color), #e5e7eb);
  color: #374151;
}

.rank.bronze {
  background: linear-gradient(135deg, var(--bronze-color), #f59e0b);
  color: #78350f;
}

.rank.default {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.player-info {
  flex: 1;
  min-width: 0;
}

.player-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.player-avatar {
  width: 24px;
  height: 24px;
  background: var(--primary-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
}

.player-stats {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.stat-value-large {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-left: auto;
  flex-shrink: 0;
}

/* Skeleton Loader */
.skeleton-loader {
  padding: var(--space-lg);
}

.skeleton-item {
  display: flex;
  align-items: center;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border-color);
}

.skeleton-item::before {
  content: '';
  width: 48px;
  height: 48px;
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--border-color) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-md);
  margin-right: var(--space-lg);
}

.skeleton-item::after {
  content: '';
  flex: 1;
  height: 20px;
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--border-color) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Load More */
.load-more-section {
  padding: var(--space-xl);
  text-align: center;
}

.load-more-btn {
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.load-more-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.load-more-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  padding: var(--space-lg);
}

.modal-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow: hidden;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-base);
}

.modal-overlay.visible .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-xl);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-body {
  padding: var(--space-xl);
  max-height: 60vh;
  overflow-y: auto;
}

/* Footer */
.footer {
  text-align: center;
  padding: var(--space-xl) 0;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.875rem;
}

.footer-note {
  margin-top: var(--space-sm);
  font-size: 0.75rem;
  opacity: 0.7;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--space-lg);
    text-align: center;
  }
  
  .stats-overview {
    gap: var(--space-lg);
  }
  
  .nav-tabs {
    position: static;
  }
  
  .tabs-container {
    justify-content: flex-start;
    padding: var(--space-sm) 0;
  }
  
  .tab-btn {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.8rem;
  }
  
  .tab-text {
    display: none;
  }
  
  .section-header {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
  
  .leaderboard-item {
    padding: var(--space-md);
  }
  
  .rank {
    width: 36px;
    height: 36px;
    font-size: 1rem;
    margin-right: var(--space-md);
  }
  
  .player-name {
    font-size: 1rem;
  }
  
  .player-stats {
    font-size: 0.8rem;
    gap: var(--space-md);
  }
  
  .stat-value-large {
    font-size: 1.25rem;
  }
  
  .search-box {
    margin: 0;
  }
}

@media (max-width: 480px) {
  .logo h1 {
    font-size: 1.5rem;
  }
  
  .player-stats {
    flex-direction: column;
    gap: var(--space-xs);
  }
  
  .leaderboard-item:hover {
    transform: none;
  }
  
  .modal {
    margin: var(--space-md);
    max-height: calc(100vh - 2rem);
  }
}

/* 动画增强 */
@media (prefers-reduced-motion: no-preference) {
  .leaderboard-item {
    animation: slideInUp 0.3s ease-out backwards;
  }
  
  .leaderboard-item:nth-child(n) {
    animation-delay: calc(0.05s * var(--index, 0));
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 深色模式适配 */
@media (prefers-color-scheme: dark) {
  .header {
    background: rgba(26, 32, 44, 0.95);
    border-bottom-color: var(--border-color);
  }
  
  .nav-tabs {
    background: rgba(26, 32, 44, 0.9);
    border-bottom-color: var(--border-color);
  }
  
  .leaderboard-section {
    background: var(--bg-primary);
  }
  
  .loading-overlay {
    background: rgba(26, 32, 44, 0.95);
  }
  
  .modal {
    background: var(--bg-primary);
  }
}