:root {
  --bg-color: #0f1115;
  --surface-color: #1a1d24;
  --surface-hover: #232731;
  --text-primary: #f0f2f5;
  --text-secondary: #9aa1af;
  --accent-color: #ff3366;
  --accent-hover: #ff5c85;
  --border-color: #2b303b;
  --radius-md: 12px;
  --radius-lg: 20px;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(15, 17, 21, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-group img {
  height: 32px;
  width: auto;
  border-radius: 6px;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.nav-links {
  display: none;
  gap: 24px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 15px;
  transition: color 0.2s;
}

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

.btn-download {
  background-color: var(--accent-color);
  color: #fff;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  transition: background-color 0.2s, transform 0.1s;
  display: inline-block;
}

.btn-download:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-download:active {
  transform: translateY(0);
}

/* Hero Section */
.hero {
  padding: 60px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 51, 102, 0.1) 0%, transparent 70%);
  z-index: -1;
}

.hero h1 {
  font-size: 36px;
  line-height: 1.3;
  margin-bottom: 20px;
  font-weight: 800;
}

.hero p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
}

.btn-primary {
  background-color: var(--accent-color);
  color: #fff;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.2s;
  display: inline-block;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 51, 102, 0.3);
}

.hero-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 48px;
}

.hero-gallery img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  border-radius: var(--radius-md);
  transition: transform 0.3s;
}

.hero-gallery img:hover {
  transform: scale(1.02);
}

/* Section Common */
.section {
  padding: 60px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-header h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 15px;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.feature-card {
  background-color: var(--surface-color);
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--accent-color);
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Recommendations */
.recommend-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.rec-card {
  background-color: var(--surface-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: transform 0.2s;
}

.rec-card:hover {
  transform: translateY(-4px);
}

.rec-card img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
}

.rec-info {
  padding: 12px;
}

.rec-info h3 {
  font-size: 15px;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rec-info p {
  font-size: 12px;
  color: var(--text-secondary);
}

/* Categories */
.category-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.category-tag {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 10px 24px;
  border-radius: 30px;
  font-size: 14px;
  cursor: default;
  transition: all 0.2s;
}

.category-tag:hover {
  background-color: var(--surface-hover);
  border-color: var(--accent-color);
  color: var(--accent-color);
}

/* Ranking */
.ranking-list {
  background-color: var(--surface-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  border: 1px solid var(--border-color);
}

.rank-item {
  display: flex;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.rank-num {
  font-size: 20px;
  font-weight: 800;
  color: var(--accent-color);
  width: 40px;
  text-align: center;
  margin-right: 16px;
  font-style: italic;
}

.rank-title {
  font-size: 16px;
  font-weight: 600;
  flex: 1;
}

.rank-desc {
  font-size: 13px;
  color: var(--text-secondary);
  display: none;
}

/* Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.review-card {
  background-color: var(--surface-color);
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.review-text {
  font-size: 15px;
  margin-bottom: 16px;
  font-style: italic;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 10px;
}

.avatar {
  width: 36px;
  height: 36px;
  background-color: var(--border-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-secondary);
}

.user-name {
  font-size: 14px;
  color: var(--text-secondary);
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--surface-color);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.faq-question {
  padding: 18px 20px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  color: var(--text-primary);
  font-family: inherit;
}

.faq-question::after {
  content: '+';
  font-size: 20px;
  color: var(--text-secondary);
  transition: transform 0.3s;
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--text-secondary);
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* Footer */
.site-footer {
  background-color: var(--bg-color);
  border-top: 1px solid var(--border-color);
  padding: 40px 0 20px;
  font-size: 13px;
  color: var(--text-secondary);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  text-align: center;
}

.footer-text {
  line-height: 1.8;
}

.footer-text a {
  color: var(--text-secondary);
  transition: color 0.2s;
}

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

.footer-time {
  font-size: 12px;
  color: #666;
}

/* Media Queries */
@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
  
  .hero h1 {
    font-size: 48px;
  }
  
  .hero-gallery {
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .recommend-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .rank-desc {
    display: block;
  }
  
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .recommend-grid {
    grid-template-columns: repeat(5, 1fr);
  }
  
  .reviews-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .section {
    padding: 80px 0;
  }
}