* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'Microsoft YaHei', sans-serif; background: #f7f7f9; color: #222; }
a { color: #1a73e8; text-decoration: none; }
header { background: #111; color: #fff; padding: 16px; }
header .container { max-width: 1080px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.site-name { font-weight: 600; font-size: 18px; }
.admin-link { color: #fff; opacity: 0.9; }

.container { max-width: 1080px; margin: 0 auto; padding: 16px; }

/* Banner */
.banner { position: relative; overflow: hidden; border-radius: 10px; background: #000; }
.banner-track { display: flex; transition: transform 0.6s ease; }
.banner-slide { flex: 0 0 100%; position: relative; }
.banner-slide img { width: 100%; height: 320px; object-fit: cover; display: block; }
.banner-dots { position: absolute; left: 0; right: 0; bottom: 12px; display: flex; justify-content: center; gap: 8px; }
.banner-dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(255,255,255,0.6); cursor: pointer; }
.banner-dot.active { background: #fff; }

/* Announcements */
.announcements { margin: 16px 0; }
.announcement { 
  background: #fff !important; 
  border: 1px solid #ffcdd2 !important; 
  border-radius: 8px; 
  padding: 12px 16px; 
  margin-bottom: 8px; 
  color: #d32f2f !important; 
  box-shadow: 0 1px 4px rgba(211, 47, 47, 0.1);
}
.announcement-title { 
  font-weight: 600; 
  font-size: 16px; 
  margin-bottom: 6px; 
  color: #c62828 !important; 
}
.announcement-content { 
  font-size: 14px; 
  line-height: 1.5; 
  color: #d32f2f !important; 
}

/* Grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; margin-top: 16px; }
.card { background: #fff; border-radius: 10px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.06); display: flex; flex-direction: column; }
.card-thumb { width: 100%; aspect-ratio: 1 / 1; background: #eee; display: block; }
.card-body { padding: 12px; }
.card-title { font-size: 16px; font-weight: 600; margin: 0 0 6px; }
.card-desc { font-size: 13px; color: #555; height: 40px; overflow: hidden; }
.card-actions { margin-top: 10px; }
.btn { 
  display: block; 
  width: 100%;
  padding: 12px; 
  border-radius: 6px; 
  background: #1a73e8; 
  color: #fff; 
  font-size: 14px; 
  text-align: center;
  border: none;
  cursor: pointer;
  box-sizing: border-box;
  margin-top: 10px;
}
.btn.secondary { background: #f0f2f5; color: #222; }

/* Detail - 严格单列布局 - 强制优先级 */
.detail { 
  display: block !important; 
  width: 100% !important; 
  max-width: 100% !important; 
  margin: 0 !important; 
  padding: 15px !important; 
  box-sizing: border-box !important;
  flex-direction: column !important;
}
.detail > * { 
  width: 100% !important; 
  margin-bottom: 20px !important; 
  display: block !important; 
  box-sizing: border-box !important;
  clear: both !important;
  float: none !important;
  position: relative !important;
}
.detail .image-section { 
  text-align: center !important; 
  width: 100% !important;
  display: block !important;
  float: none !important;
}
.detail img { 
  width: 50% !important; 
  max-width: 50% !important; 
  height: auto !important; 
  object-fit: cover !important; 
  border-radius: 10px !important; 
  box-shadow: 0 4px 12px rgba(0,0,0,0.1) !important; 
  display: block !important;
  margin: 0 auto !important;
  float: none !important;
}
.detail h1 { 
  margin: 0 0 20px 0 !important; 
  font-size: 24px !important; 
  text-align: center !important; 
  color: #333 !important; 
  line-height: 1.3 !important; 
  width: 100% !important;
  display: block !important;
  float: none !important;
}
.detail p { 
  color: #444 !important; 
  line-height: 1.6 !important; 
  text-align: left !important; 
  margin: 0 0 20px 0 !important; 
  width: 100% !important;
  display: block !important;
  float: none !important;
}
.detail .description-section {
  width: 100% !important;
  display: block !important;
  margin-bottom: 20px !important;
  float: none !important;
}
.detail .meta-info { 
  padding: 12px !important; 
  background: #f8f9fa !important; 
  border-radius: 8px !important; 
  font-size: 14px !important; 
  color: #666 !important; 
  width: 100% !important;
  box-sizing: border-box !important;
  display: block !important;
  float: none !important;
}
.detail .download-section { 
  padding: 20px !important; 
  background: #fff !important; 
  border: 2px solid #007bff !important; 
  border-radius: 10px !important; 
  margin: 20px 0 !important; 
  width: 100% !important;
  box-sizing: border-box !important;
  display: block !important;
  float: none !important;
}
.detail .video-section {
  width: 100% !important;
  display: block !important;
  box-sizing: border-box !important;
  float: none !important;
}

/* 移动端响应式优化 - 严格单列布局 */
@media (max-width: 768px) {
  .detail { 
    padding: 10px; 
    width: 100%;
    max-width: 100%;
    margin: 0;
    box-sizing: border-box;
  }
  .detail > * { 
    margin-bottom: 15px; 
    width: 100%;
    display: block;
    box-sizing: border-box;
  }
  .detail h1 { 
    font-size: 20px; 
    margin: 0 0 15px 0; 
    width: 100%;
    display: block;
    text-align: center;
  }
  .detail img { 
    width: 50% !important;
    max-width: 50% !important;
    height: auto !important;
    display: block !important;
    margin: 0 auto !important;
  }
  .detail .download-section { 
    padding: 15px; 
    margin: 15px 0; 
    width: 100%;
    box-sizing: border-box;
    display: block;
  }
  .detail .meta-info { 
    padding: 10px; 
    font-size: 13px; 
    width: 100%;
    box-sizing: border-box;
    display: block;
  }
  .video-section { 
    margin: 15px 0 !important; 
    padding: 12px !important; 
    width: 100% !important; 
    box-sizing: border-box !important; 
    display: block !important;
  }
  .video-section h3 { 
    font-size: 14px !important; 
    width: 100% !important;
    display: block !important;
  }
  .form-group {
    width: 100% !important;
    display: block !important;
    box-sizing: border-box !important;
  }
  input[type="text"], input[type="password"] {
    width: 100% !important;
    display: block !important;
    box-sizing: border-box !important;
  }
}
.form-group { 
  margin-bottom: 12px !important; 
  width: 100% !important;
  display: block !important;
  box-sizing: border-box !important;
  float: none !important;
}
input[type="text"], input[type="password"], input[type="file"], textarea, select { 
  width: 100% !important; 
  padding: 8px !important; 
  border: 1px solid #ddd !important; 
  border-radius: 6px !important; 
  display: block !important;
  box-sizing: border-box !important;
  margin: 0 !important;
  float: none !important;
}
label { 
  display: block !important; 
  font-size: 13px !important; 
  color: #333 !important; 
  margin-bottom: 6px !important; 
  width: 100% !important;
  float: none !important;
}
/* 确保验证码区域完全垂直排列 */
.form-group div {
  width: 100% !important;
  display: block !important;
  text-align: center !important;
  margin-top: 8px !important;
  float: none !important;
}
.form-group img {
  display: block !important;
  margin: 0 auto !important;
  max-width: 100% !important;
  float: none !important;
}
.notice { background: #fff3cd; color: #664d03; padding: 8px 12px; border-radius: 6px; border: 1px solid #ffe69c; }
.error { background: #fdecef; color: #b42318; padding: 8px 12px; border-radius: 6px; border: 1px solid #fdd8e5; }
.success { background: #ecfdf3; color: #027a48; padding: 8px 12px; border-radius: 6px; border: 1px solid #d1fadf; }

/* Admin */
.admin-header { display: flex; align-items: center; justify-content: space-between; }
.admin-nav { display: flex; gap: 12px; }