:root{
  --primary:#2563eb;--primary-dark:#1d4ed8;--accent:#f59e0b;
  --bg:#f6f8fb;--card:#ffffff;--text:#1f2937;--muted:#6b7280;
  --border:#e5e7eb;--success:#16a34a;--danger:#dc2626;--warning:#d97706;
  --radius:14px;--shadow:0 2px 12px rgba(15,23,42,.06);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;font-size:15px}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}

/* 布局 */
.container{max-width:1140px;margin:0 auto;padding:0 16px}
.page{padding:28px 0 48px}
.section-title{font-size:22px;font-weight:700;margin:8px 0 18px;display:flex;align-items:center;gap:10px}
.section-title small{font-size:14px;color:var(--muted);font-weight:400}

/* 顶部导航 */
.navbar{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.navbar .inner{max-width:1140px;margin:0 auto;padding:0 16px;height:60px;display:flex;align-items:center;gap:22px}
.brand{font-size:20px;font-weight:800;color:var(--primary);display:flex;align-items:center;gap:8px}
.brand .dot{width:10px;height:10px;border-radius:50%;background:var(--accent)}
.nav-links{display:flex;gap:18px;flex:1}
.nav-links a{color:var(--text);font-weight:500}
.nav-links a:hover{color:var(--primary);text-decoration:none}
.nav-right{display:flex;align-items:center;gap:14px}
.cart-badge{position:relative}
.cart-badge .count{position:absolute;top:-8px;right:-12px;background:var(--danger);color:#fff;
  font-size:11px;border-radius:10px;padding:0 5px;min-width:16px;text-align:center}
.btn{display:inline-block;padding:9px 18px;border-radius:10px;border:none;cursor:pointer;
  font-size:14px;font-weight:600;transition:.15s;background:var(--primary);color:#fff}
.btn:hover{background:var(--primary-dark);text-decoration:none}
.btn-outline{background:#fff;color:var(--primary);border:1px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-sm{padding:6px 12px;font-size:13px;border-radius:8px}
.btn-block{display:block;width:100%;text-align:center}
.btn-danger{background:var(--danger)}
.btn-danger:hover{background:#b91c1c}
.btn-success{background:var(--success)}
.btn-warning{background:var(--warning)}
.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--border)}
.btn:disabled{opacity:.55;cursor:not-allowed}

/* 卡片网格 */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:18px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);transition:.18s}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(15,23,42,.10)}
.thumb{height:160px;display:flex;align-items:center;justify-content:center;font-size:42px;
  color:#fff;font-weight:800;background:linear-gradient(135deg,#3b82f6,#2563eb)}
.card-body{padding:14px 16px}
.card-title{font-weight:700;font-size:16px;margin-bottom:4px}
.card-meta{color:var(--muted);font-size:13px;margin-bottom:8px}
.price{color:var(--danger);font-weight:800;font-size:18px}
.price .free{color:var(--success)}
.price small{color:var(--muted);font-weight:400;font-size:12px}

/* 表单 */
.form-group{margin-bottom:16px}
.form-group label{display:block;font-weight:600;margin-bottom:6px;font-size:14px}
input[type=text],input[type=password],input[type=email],input[type=number],
input[type=search],select,textarea{width:100%;padding:10px 12px;border:1px solid var(--border);
  border-radius:10px;font-size:14px;font-family:inherit;background:#fff;color:var(--text)}
textarea{min-height:120px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.form-row{display:flex;gap:14px;flex-wrap:wrap}
.form-row .form-group{flex:1;min-width:200px}

/* 消息 */
.flash{position:fixed;top:74px;right:18px;z-index:100;display:flex;flex-direction:column;gap:10px}
.alert{padding:11px 18px;border-radius:10px;color:#fff;font-size:14px;box-shadow:var(--shadow);min-width:220px}
.alert-success{background:var(--success)}.alert-danger{background:var(--danger)}
.alert-warning{background:var(--warning)}.alert-info{background:var(--primary)}

/* 表格 */
.table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.table th,.table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border);font-size:14px}
.table th{background:#f1f5f9;font-weight:700;color:#334155}
.table tr:last-child td{border-bottom:none}
.table tbody tr:hover{background:#f8fafc}

/* 徽章 */
.badge{display:inline-block;padding:2px 9px;border-radius:20px;font-size:12px;font-weight:600}
.badge-on{background:#dcfce7;color:#166534}
.badge-off{background:#fee2e2;color:#991b1b}
.badge-info{background:#dbeafe;color:#1e40af}
.badge-warn{background:#fef3c7;color:#92400e}
.badge-gray{background:#e5e7eb;color:#374151}

/* 详情页 */
.detail{display:grid;grid-template-columns:360px 1fr;gap:28px}
.detail .thumb{height:300px;border-radius:var(--radius)}
.prose{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);white-space:pre-wrap}
.locked{background:#fff7ed;border:1px dashed var(--warning);border-radius:var(--radius);padding:22px;text-align:center}

/* 页脚 */
.footer{background:#0f172a;color:#cbd5e1;margin-top:40px;padding:30px 0}
.footer a{color:#93c5fd}
.footer .cols{display:flex;flex-wrap:wrap;gap:40px}
.footer h4{color:#fff;font-size:15px;margin-bottom:10px}
.footer .bottom{border-top:1px solid #1e293b;margin-top:22px;padding-top:16px;
  font-size:13px;color:#94a3b8;text-align:center;line-height:1.9}
.footer .beian{color:#cbd5e1}

/* 后台 */
.admin-wrap{display:grid;grid-template-columns:220px 1fr;min-height:100vh}
.sidebar{background:#0f172a;color:#cbd5e1;padding:18px 0}
.sidebar .s-brand{padding:0 20px 16px;font-weight:800;color:#fff;font-size:17px;border-bottom:1px solid #1e293b;margin-bottom:10px}
.sidebar a{display:block;padding:11px 20px;color:#cbd5e1;font-size:14px}
.sidebar a:hover,.sidebar a.active{background:#1e293b;color:#fff;text-decoration:none}
.admin-main{background:var(--bg);padding:24px 30px;overflow:auto}
.admin-main h2{margin-bottom:18px}
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-bottom:26px}
.kpi{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.kpi .num{font-size:26px;font-weight:800;color:var(--primary)}
.kpi .lbl{color:var(--muted);font-size:13px}
.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:12px;flex-wrap:wrap}

/* 杂项 */
.muted{color:var(--muted)}
.center-narrow{max-width:440px;margin:40px auto;background:#fff;border:1px solid var(--border);
  border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.tabs{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}
.tabs a{padding:7px 14px;border-radius:20px;background:#fff;border:1px solid var(--border);font-size:13px;color:var(--muted)}
.tabs a.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.row-flex{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.mt{margin-top:16px}.mb{margin-bottom:16px}
.right{text-align:right}
hr{border:none;border-top:1px solid var(--border);margin:18px 0}
@media(max-width:760px){
  .detail{grid-template-columns:1fr}
  .admin-wrap{grid-template-columns:1fr}
  .sidebar{display:none}
  .nav-links{display:none}
}
/* 付费墙 */
.paywall{margin-top:22px;padding:20px;border:1px dashed #f59e0b;border-radius:14px;background:#fffbeb;text-align:center}
.paywall .pw-price{font-size:28px;font-weight:800;color:#b45309}
.paywall .pw-tip{color:#92400e;margin:4px 0 14px;font-size:14px}
.paywall .btn-block{max-width:240px;margin:0 auto}