:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --secondary: #7c3aed;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --text: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.05);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.1), 0 4px 10px rgba(0,0,0,.05);
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  --transition: .2s ease;
  --header-h: 64px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { overflow-x: hidden; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif; font-size: 15px; line-height: 1.6; color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
input, textarea, select, button { font-family: inherit; font-size: inherit; }

/* ── 布局 ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }
.layout { display: grid; grid-template-columns: 1fr 300px; gap: 24px; padding: 24px 0; }
@media(max-width:900px) { .layout { grid-template-columns: 1fr; } .sidebar { display: none; } }

/* ── Header ── */
.site-header { position: sticky; top: 0; z-index: 100; height: var(--header-h); background: #fff; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-sm); display: flex; align-items: center; }
.site-header > .container { width: 100%; }
.header-inner { height: 100%; display: flex; align-items: center; gap: 24px; }
.site-logo { font-size: 20px; font-weight: 700; color: var(--primary); letter-spacing: -0.5px; white-space: nowrap; }
.site-logo span { color: var(--secondary); }
.site-nav { display: flex; gap: 4px; flex: 1; }
.site-nav a { padding: 6px 12px; border-radius: var(--radius-sm); color: var(--text); font-size: 14px; font-weight: 500; transition: all var(--transition); }
.site-nav a:hover, .site-nav a.active { background: var(--primary-light); color: var(--primary); }
.header-search { flex: 0 0 220px; }
.header-search form { display: flex; background: var(--bg); border: 1px solid var(--border); border-radius: 20px; overflow: hidden; transition: border-color var(--transition); }
.header-search form:focus-within { border-color: var(--primary); }
.header-search input { flex: 1; min-width: 0; border: none; background: transparent; padding: 7px 12px; font-size: 13px; outline: none; }
.header-search button { flex-shrink: 0; border: none; background: transparent; padding: 0 12px; color: var(--text-muted); cursor: pointer; }
.header-user { display: flex; align-items: center; gap: 8px; white-space: nowrap; }
.btn-login { padding: 6px 16px; background: var(--primary); color: #fff !important; border-radius: 20px; font-size: 13px; font-weight: 500; }
.btn-login:hover { background: var(--primary-dark); color: #fff !important; }
.user-avatar { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; background: var(--primary-light); }
.vip-badge { background: linear-gradient(135deg,#f59e0b,#d97706); color: #fff; font-size: 11px; padding: 1px 6px; border-radius: 10px; font-weight: 600; }
@media(max-width:768px) { .site-nav { display: none; } .header-search { display: none; } .header-inner { gap: 10px; } .header-user { gap: 6px; } .header-user a[style] { font-size: 12px !important; } .site-logo { font-size: 16px; } }

/* ── 网格 ── */
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media(max-width:1100px) { .grid { grid-template-columns: repeat(3, 1fr); } }
@media(max-width:768px)  { .grid { grid-template-columns: repeat(2, 1fr); gap: 12px; } }
@media(max-width:480px)  { .grid { grid-template-columns: 1fr; } }

/* ── 卡片 ── */
.card { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; transition: transform var(--transition), box-shadow var(--transition); cursor: pointer; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card-thumb { position: relative; aspect-ratio: 16/10; overflow: hidden; background: var(--bg); }
.card-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.card:hover .card-thumb img { transform: scale(1.05); }
.card-thumb img[data-src] { opacity: 0; transition: opacity .3s ease; }
.card-thumb img.loaded { opacity: 1; }
.card-cat { position: absolute; top: 8px; left: 8px; background: var(--primary); color: #fff; font-size: 11px; padding: 2px 8px; border-radius: 10px; font-weight: 500; }
.card-dl-badge { position: absolute; top: 8px; right: 8px; font-size: 11px; padding: 2px 8px; border-radius: 10px; font-weight: 600; }
.badge-free   { background: var(--success); color: #fff; }
.badge-vip    { background: linear-gradient(135deg,#f59e0b,#d97706); color: #fff; }
.badge-pay    { background: var(--danger); color: #fff; }
.card-body { padding: 12px; }
.card-title { font-size: 14px; font-weight: 600; color: var(--text); line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 6px; }
.card-summary { font-size: 12px; color: var(--text-muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 8px; }
.card-meta { display: flex; align-items: center; justify-content: space-between; font-size: 11px; color: var(--text-light); }
.card-meta span { display: flex; align-items: center; gap: 3px; }

/* ── 侧边栏 ── */
.sidebar { display: flex; flex-direction: column; gap: 20px; }
.widget { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; }
.widget-title { padding: 14px 16px; font-size: 14px; font-weight: 600; border-bottom: 1px solid var(--border-light); color: var(--text); display: flex; align-items: center; gap: 6px; }
.widget-title::before { content: ''; width: 3px; height: 14px; background: var(--primary); border-radius: 2px; }
.widget-list { padding: 8px 0; }
.widget-list li { padding: 0; }
.widget-list a { display: flex; align-items: flex-start; gap: 10px; padding: 8px 16px; font-size: 13px; color: var(--text); transition: background var(--transition); }
.widget-list a:hover { background: var(--bg); color: var(--primary); }
.widget-list .num { flex-shrink: 0; width: 18px; height: 18px; background: var(--primary-light); color: var(--primary); border-radius: 4px; font-size: 10px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.widget-list .num.top3 { background: var(--primary); color: #fff; }
.widget-list .title { flex: 1; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; line-height: 1.4; }

/* 标签云 */
.tag-cloud { padding: 12px 16px; display: flex; flex-wrap: wrap; gap: 6px; }
.tag-item { padding: 4px 10px; background: var(--bg); border: 1px solid var(--border); border-radius: 20px; font-size: 12px; color: var(--text-muted); transition: all var(--transition); }
.tag-item:hover { background: var(--primary-light); border-color: var(--primary); color: var(--primary); }

/* ── 分页 ── */
.pagination { display: flex; align-items: center; justify-content: center; gap: 6px; padding: 32px 0; }
.pagination a, .pagination span { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: var(--radius-sm); font-size: 14px; border: 1px solid var(--border); color: var(--text); transition: all var(--transition); }
.pagination a:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.pagination .active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination .dots { border: none; color: var(--text-muted); }

/* ── 面包屑 ── */
.breadcrumb { display: flex; align-items: center; flex-wrap: wrap; gap: 4px; font-size: 13px; color: var(--text-muted); padding: 12px 0; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--border); }
.breadcrumb .current { color: var(--text); }

/* ── 文章详情 ── */
.article-header { margin-bottom: 24px; }
.article-title { font-size: 26px; font-weight: 700; line-height: 1.35; margin-bottom: 12px; color: var(--text); }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; font-size: 13px; color: var(--text-muted); margin-bottom: 16px; }
.article-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
.article-tag { padding: 3px 10px; background: var(--primary-light); color: var(--primary); border-radius: 20px; font-size: 12px; }
.article-cover { width: 100%; border-radius: var(--radius); overflow: hidden; margin-bottom: 24px; aspect-ratio: 16/7; }
.article-cover img { width: 100%; height: 100%; object-fit: cover; }
.article-content { font-size: 15px; line-height: 1.8; color: var(--text); }
.article-content h2 { font-size: 20px; font-weight: 600; margin: 28px 0 14px; color: var(--text); }
.article-content h3 { font-size: 17px; font-weight: 600; margin: 20px 0 10px; }
.article-content p { margin-bottom: 16px; }
.article-content img { max-width: 100%; border-radius: var(--radius-sm); margin: 16px auto; }
.article-content pre { background: #1e293b; color: #e2e8f0; padding: 16px; border-radius: var(--radius-sm); overflow-x: auto; margin-bottom: 16px; font-size: 13px; line-height: 1.6; }
.article-content code { background: var(--bg); padding: 2px 6px; border-radius: 4px; font-size: 13px; color: var(--secondary); }
.article-content blockquote { border-left: 4px solid var(--primary); padding: 12px 16px; background: var(--primary-light); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin-bottom: 16px; color: var(--text-muted); }
.article-content table { width: 100%; border-collapse: collapse; margin-bottom: 16px; font-size: 14px; }
.article-content th, .article-content td { padding: 10px 12px; border: 1px solid var(--border); }
.article-content th { background: var(--bg); font-weight: 600; }

/* 下载区 */
.download-box { background: linear-gradient(135deg,#eff6ff,#f0fdf4); border: 1px solid var(--primary-light); border-radius: var(--radius); padding: 20px; margin: 24px 0; }
.download-box h3 { font-size: 16px; font-weight: 600; margin-bottom: 12px; color: var(--text); }
.download-info { display: flex; gap: 16px; font-size: 13px; color: var(--text-muted); margin-bottom: 14px; flex-wrap: wrap; }
.download-info span { display: flex; align-items: center; gap: 4px; }
.btn-download { display: inline-flex; align-items: center; gap: 8px; padding: 11px 28px; background: var(--primary); color: #fff; border-radius: 8px; font-size: 15px; font-weight: 600; cursor: pointer; border: none; transition: all var(--transition); }
.btn-download:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(37,99,235,.3); color: #fff; }
.btn-download.vip-btn { background: linear-gradient(135deg,#f59e0b,#d97706); }
.btn-download.vip-btn:hover { background: linear-gradient(135deg,#d97706,#b45309); }
.download-notice { font-size: 12px; color: var(--text-muted); margin-top: 10px; }

/* ── 用户表单 ── */
.auth-wrap { max-width: 440px; margin: 60px auto; padding: 0 16px; }
.auth-card { background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border); padding: 36px 32px; box-shadow: var(--shadow); }
.auth-title { font-size: 24px; font-weight: 700; text-align: center; margin-bottom: 28px; }
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 6px; color: var(--text); }
.form-input { width: 100%; padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 14px; transition: border-color var(--transition), box-shadow var(--transition); background: var(--bg); color: var(--text); }
.form-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1); background: #fff; }
.form-error { color: var(--danger); font-size: 13px; margin-top: 4px; }
.form-success { color: var(--success); font-size: 13px; margin-top: 4px; }
.btn-submit { width: 100%; padding: 12px; background: var(--primary); color: #fff; border: none; border-radius: var(--radius-sm); font-size: 15px; font-weight: 600; cursor: pointer; transition: all var(--transition); margin-top: 8px; }
.btn-submit:hover { background: var(--primary-dark); transform: translateY(-1px); }
.auth-footer { text-align: center; margin-top: 20px; font-size: 13px; color: var(--text-muted); }

/* ── VIP套餐 ── */
.vip-plans { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
@media(max-width:768px) { .vip-plans { grid-template-columns: 1fr; } }
.plan-card { border: 2px solid var(--border); border-radius: var(--radius-lg); padding: 28px 24px; text-align: center; position: relative; transition: all var(--transition); }
.plan-card.recommend { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(37,99,235,.1); }
.plan-badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--primary); color: #fff; font-size: 12px; padding: 3px 12px; border-radius: 12px; white-space: nowrap; font-weight: 600; }
.plan-name { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.plan-price { font-size: 36px; font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.plan-price sub { font-size: 16px; font-weight: 400; }
.plan-origin { font-size: 13px; color: var(--text-muted); text-decoration: line-through; margin-bottom: 16px; }
.plan-features { text-align: left; margin-bottom: 20px; }
.plan-features li { padding: 4px 0; font-size: 13px; display: flex; align-items: center; gap: 8px; }
.plan-features li::before { content: '✓'; color: var(--success); font-weight: 700; }
.btn-buy { width: 100%; padding: 11px; background: var(--primary); color: #fff; border: none; border-radius: 8px; font-size: 15px; font-weight: 600; cursor: pointer; transition: all var(--transition); }
.btn-buy:hover { background: var(--primary-dark); }

/* ── 收银台 ── */
.checkout-wrap { max-width: 520px; margin: 40px auto; padding: 0 16px; }
.checkout-card { background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border); overflow: hidden; box-shadow: var(--shadow); }
.checkout-header { padding: 20px 24px; border-bottom: 1px solid var(--border); }
.checkout-header h2 { font-size: 18px; font-weight: 600; }
.checkout-product { padding: 20px 24px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
.checkout-amount { font-size: 28px; font-weight: 800; color: var(--danger); }
.pay-methods { padding: 20px 24px; border-bottom: 1px solid var(--border); }
.pay-methods h3 { font-size: 14px; font-weight: 600; margin-bottom: 12px; }
.pay-method-list { display: flex; flex-direction: column; gap: 8px; }
.pay-method-item { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border: 2px solid var(--border); border-radius: var(--radius-sm); cursor: pointer; transition: all var(--transition); }
.pay-method-item:hover, .pay-method-item.selected { border-color: var(--primary); background: var(--primary-light); }
.pay-method-item input { accent-color: var(--primary); }
.pay-method-icon { width: 32px; height: 20px; object-fit: contain; }
.qr-wrap { text-align: center; padding: 20px 24px; }
.qr-wrap canvas { margin: 0 auto 12px; }
.pay-timer { font-size: 13px; color: var(--danger); margin-bottom: 12px; }

/* ── Footer ── */
.site-footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 40px 0 24px; margin-top: 48px; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
@media(max-width:768px) { .footer-inner { grid-template-columns: 1fr; } }
.footer-logo { font-size: 20px; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
.footer-desc { font-size: 13px; color: var(--text-muted); line-height: 1.7; }
.footer-col h4 { font-size: 14px; font-weight: 600; margin-bottom: 12px; }
.footer-col a { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 6px; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 20px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; font-size: 12px; color: var(--text-muted); }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }
.footer-links a { color: var(--text-muted); font-size: 12px; }
.footer-links a:hover { color: var(--primary); }

/* ── Banner / Hero ── */
.hero { background: linear-gradient(135deg,#1e40af,#7c3aed); padding: 40px 0; margin-bottom: 24px; }
.hero-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.hero-text h1 { font-size: 30px; font-weight: 800; color: #fff; margin-bottom: 10px; line-height: 1.2; }
.hero-text p  { font-size: 15px; color: rgba(255,255,255,.8); margin-bottom: 20px; }
.hero-search { display: flex; gap: 8px; max-width: 460px; }
.hero-search input { flex: 1; padding: 12px 16px; border-radius: var(--radius-sm); border: none; font-size: 14px; outline: none; }
.hero-search button { padding: 0 24px; background: var(--accent); color: #fff; border: none; border-radius: var(--radius-sm); font-weight: 600; cursor: pointer; white-space: nowrap; }

/* ── 通用 ── */
.section-title { font-size: 18px; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.section-title::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.empty { text-align: center; padding: 60px 0; color: var(--text-muted); font-size: 15px; }
.badge { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 600; }
.badge-success { background: #d1fae5; color: var(--success); }
.badge-danger  { background: #fee2e2; color: var(--danger); }
.badge-warning { background: #fef3c7; color: var(--warning); }
.badge-primary { background: var(--primary-light); color: var(--primary); }
.alert { padding: 12px 16px; border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 14px; }
.alert-error   { background: #fee2e2; color: var(--danger); border: 1px solid #fca5a5; }
.alert-success { background: #d1fae5; color: var(--success); border: 1px solid #6ee7b7; }
.alert-info    { background: var(--primary-light); color: var(--primary); border: 1px solid #93c5fd; }

/* 用户中心 */
.user-center { display: grid; grid-template-columns: 220px 1fr; gap: 24px; }
@media(max-width:768px) { .user-center { grid-template-columns: 1fr; } }
.user-nav { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; height: fit-content; }
.user-info { padding: 20px 16px; text-align: center; border-bottom: 1px solid var(--border); }
.user-avatar-lg { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; margin: 0 auto 10px; background: var(--primary-light); }
.user-name { font-weight: 600; margin-bottom: 4px; }
.user-nav-list a { display: flex; align-items: center; gap: 8px; padding: 12px 16px; font-size: 14px; color: var(--text); border-bottom: 1px solid var(--border-light); transition: all var(--transition); }
.user-nav-list a:hover, .user-nav-list a.active { background: var(--primary-light); color: var(--primary); }
.user-main { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); padding: 24px; }

/* ── 后台入口 ── */
.manage-login { max-width: 380px; margin: 100px auto; padding: 0 16px; }

/* ── 分类过滤栏 ── */
.cat-filter { display: flex; flex-wrap: wrap; gap: 8px; padding: 16px 16px 0; }
.cat-btn { display: inline-block; padding: 6px 16px; border-radius: 20px; font-size: 13px; font-weight: 500; color: var(--text-muted); background: var(--bg-card); border: 1px solid var(--border); transition: all var(--transition); cursor: pointer; }
.cat-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.cat-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }