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

:root {
  --bg: #0f0f14;
  --surface: #1a1a24;
  --border: #2a2a3a;
  --text: #e4e4ec;
  --text-secondary: #9898b0;
  --accent: #7c5ce7;
  --accent-glow: rgba(124, 92, 231, 0.3);
  --red: #e74c3c;
  --green: #2ecc71;
  --radius: 10px;
  --nav-height: 60px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* ===== 全局导航栏 ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15, 15, 20, 0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height); display: flex; align-items: center;
}
.nav .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.nav .logo {
  font-size: 1.3rem; font-weight: 800; text-decoration: none;
  color: var(--text); letter-spacing: -0.5px; white-space: nowrap;
}
.nav .logo span { color: var(--accent); }
.nav-links { display: flex; gap: 20px; align-items: center; }
.nav-links a {
  color: var(--text-secondary); text-decoration: none; font-size: 0.9rem;
  transition: color 0.2s; white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-builder {
  background: var(--accent); color: #fff !important;
  padding: 6px 14px; border-radius: 6px; font-weight: 600;
}

/* ===== Hero ===== */
.hero {
  text-align: center; padding: 60px 0 40px;
}
.hero h1 { font-size: 2.2rem; margin-bottom: 10px; letter-spacing: -0.5px; }
.hero p { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 24px; }
.hero .search-box {
  display: flex; max-width: 480px; margin: 0 auto;
}
.hero .search-box input {
  flex: 1; padding: 12px 18px; border: 1px solid var(--border); border-radius: 8px 0 0 8px;
  background: var(--surface); color: var(--text); font-size: 1rem; outline: none;
  transition: border-color 0.2s;
}
.hero .search-box input:focus { border-color: var(--accent); }
.hero .search-box input::placeholder { color: var(--text-secondary); }
.hero .search-box button {
  padding: 12px 20px; background: var(--accent); color: #fff; border: none;
  border-radius: 0 8px 8px 0; cursor: pointer; font-size: 1rem; font-weight: 600;
}

/* ===== 分类导航卡片 ===== */
.category-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  padding-bottom: 40px;
}
.category-card {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px 16px;
  text-decoration: none; color: var(--text); text-align: center;
  transition: border-color 0.2s, transform 0.15s, box-shadow 0.15s;
}
.category-card:hover {
  border-color: var(--accent); transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.category-card .cat-icon { font-size: 2rem; }
.category-card .cat-name { font-size: 1rem; font-weight: 700; }
.category-card .cat-desc { color: var(--text-secondary); font-size: 0.82rem; line-height: 1.4; }

/* ===== 标签筛选栏 ===== */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px;
}
.filter-tag {
  padding: 6px 16px; border-radius: 20px; border: 1px solid var(--border);
  background: transparent; color: var(--text-secondary); font-size: 0.85rem;
  cursor: pointer; transition: all 0.2s;
}
.filter-tag:hover { border-color: var(--accent); color: var(--text); }
.filter-tag.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ===== 文章列表 ===== */
.section-title { font-size: 1.4rem; margin-bottom: 20px; }
.article-list { padding-bottom: 60px; }
.article-card {
  display: flex; gap: 24px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 16px;
  transition: border-color 0.2s, transform 0.15s; cursor: pointer;
  text-decoration: none; color: inherit;
}
.article-card:hover {
  border-color: var(--accent); transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.article-card img {
  width: 200px; height: 140px; object-fit: cover;
  border-radius: 8px; flex-shrink: 0; background: var(--border);
}
.article-card .info { display: flex; flex-direction: column; justify-content: center; }
.article-card h3 { font-size: 1.2rem; margin-bottom: 6px; }
.article-card .desc { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 8px; }
.article-card .meta { font-size: 0.82rem; color: var(--text-secondary); }
.article-card .tag {
  display: inline-block; padding: 2px 10px; background: var(--accent);
  color: #fff; border-radius: 12px; font-size: 0.78rem; margin-right: 6px;
}

/* 分级徽章 — 产品卡片上的小标签 */
.tier-badge {
  display: inline-block; padding: 2px 10px; border-radius: 10px;
  font-size: 0.72rem; font-weight: 600;
}
.tier-beginner { background: rgba(46,204,113,0.12); color: #2ecc71; border: 1px solid rgba(46,204,113,0.25); }
.tier-intermediate { background: rgba(124,92,231,0.12); color: #9b82f0; border: 1px solid rgba(124,92,231,0.25); }
.tier-advanced { background: rgba(243,156,18,0.12); color: #f0b844; border: 1px solid rgba(243,156,18,0.25); }

/* 分类页分级筛选栏 — 与首页 filter-tag 保持一致 */
.tier-tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.tier-tab {
  padding: 6px 18px; border-radius: 20px; border: 1px solid var(--border);
  background: transparent; color: var(--text-secondary); font-size: 0.85rem;
  cursor: pointer; transition: all 0.2s;
}
.tier-tab:hover { border-color: var(--accent); color: var(--text); }
.tier-tab.active { border-color: var(--accent); background: var(--accent); color: #fff; }

.no-results { text-align: center; padding: 40px; color: var(--text-secondary); }

/* ===== 文章页 ===== */
.article-page { padding: 50px 0 60px; }
.article-page h1 { font-size: 2rem; margin-bottom: 8px; }
.article-page .meta { color: var(--text-secondary); margin-bottom: 30px; font-size: 0.9rem; }
.article-page .content { max-width: 720px; }
.article-page .content h2 { font-size: 1.4rem; margin: 36px 0 14px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.article-page .content h3 { font-size: 1.1rem; margin: 24px 0 10px; color: var(--accent); }
.article-page .content p { margin-bottom: 16px; color: var(--text-secondary); }
.article-page .content ul { margin: 10px 0 20px 20px; color: var(--text-secondary); }
.article-page .content li { margin-bottom: 6px; }

/* 文章页内产品卡片 */
.product-card {
  display: flex; gap: 20px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; margin: 20px 0;
}
.product-card img {
  width: 160px; height: 120px; object-fit: cover;
  border-radius: 8px; flex-shrink: 0; background: var(--border);
}
.product-card .prod-info h4 { font-size: 1.05rem; margin-bottom: 4px; }
.product-card .prod-info .price { color: var(--accent); font-weight: 700; font-size: 1.1rem; margin-bottom: 6px; }
.product-card .prod-info .note { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 10px; }

.btn {
  display: inline-block; padding: 8px 20px; background: var(--accent);
  color: #fff; text-decoration: none; border-radius: 6px; font-size: 0.9rem;
  transition: background 0.2s; cursor: pointer; border: none;
}
.btn:hover { background: #9370f0; }
.btn-outline {
  display: inline-block; padding: 8px 20px;
  border: 1px solid var(--accent); color: var(--accent);
  text-decoration: none; border-radius: 6px; font-size: 0.9rem;
  transition: all 0.2s; cursor: pointer; background: transparent;
}
.btn-outline:hover { background: var(--accent); color: #fff; }

/* ===== 分类浏览页 ===== */
.breadcrumb { padding: 20px 0; color: var(--text-secondary); font-size: 0.85rem; }
.breadcrumb a { color: var(--text-secondary); text-decoration: none; }
.breadcrumb a:hover { color: var(--text); }
.category-header { text-align: center; padding: 30px 0 40px; }
.category-header .cat-icon-big { font-size: 3rem; }
.category-header h1 { font-size: 1.8rem; margin: 10px 0 6px; }
.category-header p { color: var(--text-secondary); }
.sort-bar { display: flex; gap: 10px; margin-bottom: 24px; justify-content: flex-end; }
.sort-bar select {
  padding: 8px 14px; border: 1px solid var(--border); border-radius: 6px;
  background: var(--surface); color: var(--text); font-size: 0.9rem; outline: none;
}
.product-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; padding-bottom: 60px; }
.product-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; display: flex; gap: 16px;
  transition: border-color 0.2s;
}
.product-item:hover { border-color: var(--accent); }
.product-item img {
  width: 120px; height: 90px; object-fit: cover;
  border-radius: 6px; flex-shrink: 0; background: var(--border);
}
.product-item .prod-detail h4 { font-size: 1rem; margin-bottom: 4px; }
.product-item .prod-detail .price { color: var(--accent); font-weight: 700; font-size: 1rem; margin-bottom: 4px; }
.product-item .prod-detail .prod-desc { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 8px; line-height: 1.5; }
.product-item .prod-detail .prod-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.product-item .prod-detail .prod-tag {
  font-size: 0.72rem; padding: 2px 8px; border-radius: 10px;
  border: 1px solid var(--border); color: var(--text-secondary);
}

/* ===== 产品详情页 ===== */
.product-detail { padding-top: 20px; }
.pd-layout { display: flex; gap: 40px; margin-bottom: 40px; }
.pd-image { flex: 0 0 400px; }
.pd-image img { width: 100%; border-radius: var(--radius); background: var(--surface); }
.pd-info { flex: 1; display: flex; flex-direction: column; justify-content: center; }
.pd-info h1 { font-size: 1.8rem; margin: 10px 0 6px; }
.pd-info .pd-price { font-size: 1.6rem; font-weight: 700; color: var(--accent); margin: 12px 0; }
.pd-info .pd-desc { color: var(--text-secondary); font-size: 1.05rem; line-height: 1.8; margin-bottom: 20px; }
.pd-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.pd-tags .prod-tag {
  font-size: 0.8rem; padding: 4px 12px; border-radius: 14px;
  border: 1px solid var(--border); color: var(--text-secondary);
}
.pd-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 10px; }
.btn-large { padding: 14px 32px; font-size: 1rem; }
.pd-note { color: var(--text-secondary); font-size: 0.82rem; margin-top: 16px; opacity: 0.7; }

/* ===== 配置器页 ===== */
.builder-page { padding: 50px 0 60px; }
.builder-page h1 { font-size: 2rem; text-align: center; margin-bottom: 8px; }
.builder-page .builder-subtitle { text-align: center; color: var(--text-secondary); margin-bottom: 40px; }

.builder-steps { display: flex; flex-direction: column; gap: 24px; margin-bottom: 40px; }
.builder-step {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
}
.builder-step .step-header {
  display: flex; align-items: center; gap: 12px; margin-bottom: 16px;
}
.builder-step .step-num {
  width: 32px; height: 32px; border-radius: 50%; background: var(--accent);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.9rem; flex-shrink: 0;
}
.builder-step .step-label { font-weight: 700; font-size: 1.05rem; }
.builder-step .step-options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.builder-step .step-option {
  padding: 12px 16px; border: 1px solid var(--border); border-radius: 8px;
  cursor: pointer; transition: all 0.2s; color: var(--text-secondary);
}
.builder-step .step-option:hover { border-color: var(--accent); color: var(--text); }
.builder-step .step-option.selected {
  border-color: var(--accent); background: rgba(124, 92, 231, 0.1); color: var(--text);
}
.builder-step .step-option .opt-name { font-weight: 600; color: var(--text); }
.builder-step .step-option .opt-price { color: var(--accent); font-size: 0.9rem; }
.builder-step .step-option .opt-desc { font-size: 0.8rem; margin-top: 2px; }
.step-skip { display: inline-block; margin-top: 10px; font-size: 0.82rem; color: var(--text-secondary); cursor: pointer; }

.builder-summary {
  background: var(--surface); border: 1px solid var(--accent); border-radius: var(--radius);
  padding: 24px; margin-bottom: 30px;
}
.builder-summary h3 { margin-bottom: 14px; }
.builder-summary .summary-item {
  display: flex; justify-content: space-between; padding: 6px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04); color: var(--text-secondary);
}
.builder-summary .summary-item .si-name { color: var(--text); }
.builder-summary .summary-total { display: flex; justify-content: space-between; padding-top: 12px; font-size: 1.2rem; font-weight: 700; }
.builder-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.builder-empty { text-align: center; color: var(--text-secondary); padding: 20px; font-size: 0.9rem; }

/* ===== 套装卡片 ===== */
.bundle-section { padding-bottom: 40px; }
.bundle-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.bundle-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  transition: border-color 0.2s;
}
.bundle-card:hover { border-color: var(--accent); }
.bundle-card .bundle-badge {
  display: inline-block; padding: 3px 10px; background: rgba(46, 204, 113, 0.15);
  color: var(--green); border-radius: 10px; font-size: 0.75rem; font-weight: 600; margin-bottom: 12px;
}
.bundle-card h4 { margin-bottom: 6px; font-size: 1rem; }
.bundle-card .bundle-desc { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 12px; line-height: 1.5; }
.bundle-card .bundle-items { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 14px; }
.bundle-card .bundle-item-tag {
  font-size: 0.72rem; padding: 2px 8px; border-radius: 8px;
  background: rgba(124, 92, 231, 0.15); color: var(--accent);
}

/* ===== 页脚 ===== */
.footer {
  text-align: center; padding: 30px 0;
  border-top: 1px solid var(--border); color: var(--text-secondary); font-size: 0.85rem;
}
.footer a { color: var(--text-secondary); text-decoration: underline; }
.footer-links { display: flex; gap: 20px; justify-content: center; margin-bottom: 8px; }

/* Toast */
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%);
  background: var(--green); color: #fff; padding: 10px 24px; border-radius: 8px;
  font-weight: 600; font-size: 0.9rem; z-index: 999; animation: fadeInUp 0.3s ease;
}
@keyframes fadeInUp { from { opacity: 0; transform: translateX(-50%) translateY(10px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }

.hidden { display: none !important; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: 1fr; }
  .bundle-grid { grid-template-columns: 1fr; }
  .builder-step .step-options { grid-template-columns: 1fr; }
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 0.82rem; }
}

@media (max-width: 640px) {
  .article-card { flex-direction: column; }
  .article-card img { width: 100%; height: 180px; }
  .product-card { flex-direction: column; }
  .product-card img { width: 100%; height: 180px; }
  .product-item { flex-direction: column; }
  .product-item img { width: 100%; height: 160px; }
  .pd-layout { flex-direction: column; }
  .pd-image { flex: none; }
  .pd-image img { max-height: 280px; object-fit: contain; }
  .category-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .hero h1 { font-size: 1.6rem; }
  .hero { padding: 40px 0 30px; }
  .nav .logo { font-size: 1.1rem; }
  .nav-links { gap: 8px; }
}