/* U51资源网 - 全局样式与主题 */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700&family=Rajdhani:wght@400;500;600;700&family=Exo+2:wght@300;400;500;600&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  /* 基础变量 */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a24;
  --bg-card-hover: #22222e;
  --color-primary: #00d4ff;
  --color-secondary: #7c3aed;
  --color-accent: #10b981;
  --color-warning: #f59e0b;
  --text-primary: #f0f0f5;
  --text-secondary: #8888a0;
  --text-muted: #555566;
  --border-color: rgba(255, 255, 255, 0.08);
  --glow-primary: rgba(0, 212, 255, 0.4);
  --glow-secondary: rgba(124, 58, 237, 0.4);
  
  /* 字体 */
  --font-display: 'Orbitron', 'Rajdhani', sans-serif;
  --font-body: 'Exo 2', 'Noto Sans SC', sans-serif;
  
  /* 间距 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  
  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

/* 白天主题 */
[data-theme="light"] {
  --bg-primary: #f5f7fa;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f2f5;
  --color-primary: #0066cc;
  --color-secondary: #7c3aed;
  --color-accent: #10b981;
  --text-primary: #1a1a2e;
  --text-secondary: #555566;
  --text-muted: #999aaa;
  --border-color: rgba(0, 0, 0, 0.08);
  --glow-primary: rgba(0, 102, 204, 0.2);
  --glow-secondary: rgba(124, 58, 237, 0.2);
}

/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 链接默认无下划线 */
a {
  text-decoration: none;
  color: inherit;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--bg-card);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background: var(--bg-secondary);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
}

.nav-left {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  font-family: var(--font-display);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: white;
  box-shadow: 0 0 20px var(--glow-primary);
  animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px var(--glow-primary); }
  50% { box-shadow: 0 0 30px var(--glow-primary), 0 0 40px var(--glow-secondary); }
}

.logo-text {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 2px;
}

.logo-sub {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 400;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

.nav-center {
  flex: 1;
  max-width: 500px;
  margin: 0 var(--space-xl);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s ease;
}

.search-box:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.15);
}

[data-theme="light"] .search-box {
  background: var(--bg-secondary);
}

.search-box input {
  flex: 1;
  background: transparent;
  border: none;
  padding: var(--space-md) var(--space-lg);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-btn {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border: none;
  padding: var(--space-md) var(--space-lg);
  color: white;
  cursor: pointer;
  transition: all 0.3s ease;
}

.search-btn:hover {
  opacity: 0.9;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-icon-btn {
  width: 42px;
  height: 42px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all 0.3s ease;
}

.nav-icon-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.theme-toggle {
  width: 42px;
  height: 42px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  color: var(--color-warning);
  border-color: var(--color-warning);
}

/* 主内容区 */
.main-content {
  padding-top: 70px;
  min-height: calc(100vh - 70px);
}

/* 通用区块 */
.section {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.section-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-title i {
  color: var(--color-primary);
}

.section-more {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  transition: all 0.3s ease;
}

.section-more:hover {
  color: var(--color-primary);
}

/* 轮播图 */
.hero-section {
  position: relative;
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-lg);
}

.hero-slider {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  height: 400px;
}

.hero-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2xl);
  opacity: 0;
  transition: all 0.6s ease;
  transform: scale(1.05);
}

.hero-slide.active {
  opacity: 1;
  transform: scale(1);
}

.hero-content {
  max-width: 500px;
  z-index: 2;
}

.hero-tag {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-md);
}

.hero-title {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.hero-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  border: none;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.hero-btn:hover {
  transform: translateX(5px);
  box-shadow: 0 10px 30px var(--glow-primary);
}

.hero-visual {
  position: relative;
  width: 300px;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.glow-orb {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-primary, #00d4ff) 0%, transparent 70%);
  filter: blur(30px);
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-20px) scale(1.1); }
}

.hero-dots {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg-card);
  cursor: pointer;
  transition: all 0.3s ease;
}

.dot.active {
  background: var(--color-primary);
  box-shadow: 0 0 10px var(--glow-primary);
}

/* 标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.tag:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* 资源网格 */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.resource-card {
  background: transparent;
  border: none;
  border-radius: 0;
  overflow: visible;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
}

.resource-card:hover {
  transform: translateY(-5px);
}

.card-thumb {
  height: 160px;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.card-thumb::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to top, var(--bg-card), transparent);
}

.card-thumb i {
  font-size: 48px;
  color: var(--text-muted);
  opacity: 0.5;
}

.card-tag {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  background: rgba(0, 212, 255, 0.2);
  color: var(--color-primary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 600;
}

.card-body {
  padding: var(--space-md);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 12px;
  color: var(--text-muted);
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
}

.card-size {
  font-size: 12px;
  color: var(--text-secondary);
  flex-shrink: 0;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-btn {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  border: none;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  flex-shrink: 0;
  text-decoration: none;
}

.card-btn:hover {
  transform: scale(1.05);
}

/* 榜单列表 */
.rank-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.rank-item {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  gap: var(--space-md);
  cursor: pointer;
  transition: all 0.3s ease;
}

.rank-item:hover {
  border-color: var(--color-primary);
  transform: translateX(5px);
}

.rank-num {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
}

.rank-item:nth-child(1) .rank-num {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  color: #1a1a24;
}

.rank-item:nth-child(2) .rank-num {
  background: linear-gradient(135deg, #9ca3af, #d1d5db);
  color: #1a1a24;
}

.rank-item:nth-child(3) .rank-num {
  background: linear-gradient(135deg, #d97706, #f59e0b);
  color: #1a1a24;
}

.rank-thumb {
  width: 60px;
  height: 60px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.rank-thumb i {
  font-size: 24px;
  color: var(--text-muted);
}

.rank-info {
  flex: 1;
}

.rank-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.rank-meta {
  font-size: 12px;
  color: var(--text-muted);
}

.rank-downloads {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* 页脚 */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-2xl) 0;
  margin-top: var(--space-2xl);
}

.footer-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.footer-content {
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.footer-brand .logo-icon {
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: white;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.3s ease;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-copyright {
  font-size: 13px;
  color: var(--text-muted);
}

/* 响应式 */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .nav-center {
    display: none;
  }
  
  .hero-title {
    font-size: 28px;
  }
  
  .hero-visual {
    display: none;
  }
  
  .resource-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
}