/* ============================================
   91GameDown - 免费在线游戏门户
   干净、轻量、游戏感设计
   ============================================ */

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  color: #1f2937;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  line-height: 1.6;
}

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

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

/* --- 导航栏 --- */
.navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  font-weight: 500;
  font-size: 0.95rem;
  color: #4b5563;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: #667eea;
}

/* --- 主容器 --- */
.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* --- Hero 主视觉 --- */
.hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
  color: #fff;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.hero p {
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto;
  opacity: 0.9;
}

/* --- 游戏卡片网格 --- */
.section-title {
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-align: center;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  padding-bottom: 2rem;
}

.game-card {
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.game-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.game-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.game-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #667eea;
  background: #ede9fe;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  margin-bottom: 0.5rem;
  align-self: flex-start;
}

.game-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  color: #1f2937;
}

.game-card p {
  font-size: 0.9rem;
  color: #6b7280;
  flex: 1;
  margin-bottom: 1rem;
}

.btn-play {
  display: inline-block;
  padding: 0.55rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: opacity 0.2s;
  text-align: center;
  align-self: flex-start;
}

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

/* --- 分类页 --- */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
  padding-bottom: 2rem;
}

.category-card {
  background: #fff;
  border-radius: 12px;
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s;
}

.category-card:hover {
  transform: translateY(-2px);
}

.cat-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.category-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #1f2937;
  margin-bottom: 0.25rem;
}

.coming-soon-tag {
  display: inline-block;
  font-size: 0.8rem;
  color: #764ba2;
  font-weight: 600;
  margin-top: 0.5rem;
}

/* --- 内容页（隐私政策 / 服务条款 / 404） --- */
.content-page {
  background: #fff;
  max-width: 800px;
  margin: 2rem auto;
  border-radius: 12px;
  padding: 2.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.content-page h1 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  color: #1f2937;
}

.content-page h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 1.5rem 0 0.5rem;
  color: #374151;
}

.content-page p,
.content-page li {
  color: #4b5563;
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.content-page ul {
  padding-left: 1.5rem;
}

/* --- 404 错误页 --- */
.error-code {
  font-size: 5rem;
  font-weight: 800;
  text-align: center;
  background: linear-gradient(135deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- 页脚 --- */
.footer {
  background: rgba(0, 0, 0, 0.15);
  color: rgba(255, 255, 255, 0.8);
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-links a:hover {
  color: #fff;
}

/* --- 响应式 --- */
@media (max-width: 640px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .game-grid {
    grid-template-columns: 1fr;
  }

  .categories-grid {
    grid-template-columns: 1fr 1fr;
  }

  .content-page {
    margin: 1rem;
    padding: 1.5rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .logo {
    font-size: 1.25rem;
  }
}