:root{
  --primary:#1d4ed8;
  --primary-dark:#1e40af;
  --accent:#0ea5e9;
  --bg:#f6f8fc;
  --card:#ffffff;
  --text:#1f2937;
  --muted:#6b7280;
  --border:#e6e9f0;
  --ok:#16a34a;
  --warn:#d97706;
  --danger:#dc2626;
  --radius:14px;
  --shadow:0 6px 24px rgba(29,78,216,.08);
  --shadow-sm:0 2px 8px rgba(17,24,39,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.container{max-width:1080px;margin:0 auto;padding:0 20px}

/* ---------- 导航 ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:62px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--text)}
.logo .dot{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--primary),var(--accent));
  display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:16px}
.nav-links{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.nav-links a.navitem{padding:8px 14px;border-radius:9px;color:var(--text);font-weight:600;font-size:15px}
.nav-links a.navitem:hover{background:var(--bg);text-decoration:none}
.nav-links a.navitem.active{color:var(--primary);background:#eef3ff}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border-radius:10px;
  font-weight:700;font-size:15px;cursor:pointer;border:1px solid transparent;transition:.15s}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}
.btn-primary:hover{filter:brightness(1.06);text-decoration:none}
.btn-ghost{background:#fff;border-color:var(--border);color:var(--text)}
.btn-ghost:hover{background:var(--bg);text-decoration:none}
.btn-sm{padding:7px 13px;font-size:13.5px}
.btn-block{width:100%}
.btn-danger{background:#fff;border-color:var(--danger);color:var(--danger)}
.btn-danger:hover{background:#fef2f2}
.menu-toggle{display:none;background:none;border:0;font-size:24px;cursor:pointer;color:var(--text)}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(1200px 500px at 80% -10%,rgba(14,165,233,.18),transparent),
  radial-gradient(900px 500px at 0% 0%,rgba(29,78,216,.16),transparent),
  linear-gradient(180deg,#eef3ff,#f6f8fc);
  padding:74px 0 64px}
.hero h1{font-size:42px;line-height:1.2;margin:0 0 14px;letter-spacing:-.5px}
.hero .sub{font-size:18px;color:var(--muted);max-width:640px;margin:0 0 26px}
.badge{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--border);
  padding:6px 14px;border-radius:999px;font-size:13.5px;color:var(--muted);box-shadow:var(--shadow-sm)}

/* ---------- 语言切换（首页中英双语） ---------- */
body.lang-zh .en{display:none !important}
body.lang-en .zh{display:none !important}
.hero-top{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:18px}
.lang-switch{display:inline-flex;background:#fff;border:1px solid var(--border);border-radius:999px;padding:3px;box-shadow:var(--shadow-sm)}
.lang-btn{border:0;background:transparent;font:inherit;font-weight:700;font-size:13.5px;color:var(--muted);
  padding:6px 14px;border-radius:999px;cursor:pointer;transition:.15s}
.lang-btn.active{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}

/* ---------- 板块卡片 ---------- */
.section{padding:54px 0}
.section h2{font-size:28px;margin:0 0 8px}
.section .lead{color:var(--muted);margin:0 0 30px}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow-sm);transition:.18s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#d4ddf5}
.card .ico{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  font-size:22px;margin-bottom:14px;background:#eef3ff;color:var(--primary)}
.card h3{margin:0 0 8px;font-size:20px}
.card p{margin:0 0 16px;color:var(--muted);font-size:14.5px;flex:1}
.card .tag{font-size:12.5px;color:var(--accent);font-weight:700;letter-spacing:.5px;text-transform:uppercase}

/* ---------- 通用内容 ---------- */
.page-head{padding:46px 0 18px}
.page-head h1{font-size:32px;margin:0 0 8px}
.page-head p{color:var(--muted);margin:0;max-width:720px}
.panel{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px;
  box-shadow:var(--shadow-sm);margin-bottom:22px}
.panel h3{margin:0 0 14px;font-size:20px}
.two{display:grid;grid-template-columns:1.4fr 1fr;gap:22px}
.feature-list{list-style:none;padding:0;margin:0}
.feature-list li{padding:10px 0;border-bottom:1px dashed var(--border);display:flex;gap:10px}
.feature-list li:last-child{border-bottom:0}
.feature-list .k{color:var(--primary);font-weight:700;min-width:96px}

/* ---------- 表格 ---------- */
.table{width:100%;border-collapse:collapse;font-size:14px;background:var(--card);border-radius:12px;overflow:hidden}
.table th,.table td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--border)}
.table th{background:#f3f6fd;color:#374151;font-weight:700;font-size:13.5px}
.table tr:hover td{background:#fafbff}
.table td .mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--primary-dark);font-weight:600}

/* ---------- 表单 ---------- */
.field{margin-bottom:16px}
.field label{display:block;font-weight:600;margin-bottom:6px;font-size:14.5px}
.field input,.field select,.field textarea{width:100%;padding:11px 13px;border:1px solid var(--border);
  border-radius:10px;font-size:15px;font-family:inherit;background:#fff;transition:.15s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(29,78,216,.12)}
.form-box{max-width:420px;margin:40px auto;background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:30px;box-shadow:var(--shadow)}
.form-box h2{margin:0 0 4px;font-size:24px}
.form-box .hint{color:var(--muted);font-size:14px;margin:0 0 20px}

/* ---------- 提示 ---------- */
.alert{padding:12px 16px;border-radius:10px;margin-bottom:16px;font-size:14.5px;border:1px solid}
.alert-ok{background:#f0fdf4;border-color:#bbf7d0;color:#166534}
.alert-err{background:#fef2f2;border-color:#fecaca;color:#991b1b}
.alert-info{background:#eff6ff;border-color:#bfdbfe;color:#1e40af}

/* ---------- 页脚 ---------- */
.footer{background:#0f172a;color:#cbd5e1;padding:38px 0;margin-top:30px;font-size:14px}
.footer a{color:#93c5fd}
.footer .cols{display:flex;justify-content:space-between;flex-wrap:wrap;gap:20px}

/* ---------- 进度/面包屑 ---------- */
.crumbs{font-size:13.5px;color:var(--muted);margin:18px 0}
.crumbs a{color:var(--muted)}

/* ---------- 后台 ---------- */
.admin-shell{display:grid;grid-template-columns:220px 1fr;min-height:100vh}
.sidebar{background:#0f172a;color:#cbd5e1;padding:22px 16px}
.sidebar .sb-logo{color:#fff;font-weight:800;font-size:18px;margin-bottom:22px;display:flex;align-items:center;gap:10px}
.sidebar a{display:block;color:#cbd5e1;padding:10px 12px;border-radius:9px;margin-bottom:4px;font-weight:600}
.sidebar a:hover,.sidebar a.active{background:rgba(255,255,255,.1);color:#fff;text-decoration:none}
.sidebar .sb-user{margin-top:18px;padding-top:16px;border-top:1px solid rgba(255,255,255,.12);font-size:13px}
.admin-main{padding:26px 30px;background:var(--bg)}
.admin-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:24px}
.stat{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px;box-shadow:var(--shadow-sm)}
.stat .n{font-size:30px;font-weight:800;color:var(--primary)}
.stat .l{color:var(--muted);font-size:14px}
.pill{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;font-weight:700}
.pill-member{background:#eef3ff;color:var(--primary)}
.pill-admin{background:#fef3c7;color:#92400e}
.pill-super{background:#dcfce7;color:#166534}
.pill-active{background:#dcfce7;color:#166534}
.pill-inactive{background:#fee2e2;color:#991b1b}

/* ---------- 响应式 ---------- */
@media (max-width:860px){
  .cards{grid-template-columns:1fr}
  .two{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:1fr}
  .admin-shell{grid-template-columns:1fr}
  .sidebar{display:none}
  .hero h1{font-size:32px}
  .nav-links{display:none;position:absolute;top:62px;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);
    flex-direction:column;padding:12px 20px;gap:4px}
  .nav-links.open{display:flex}
  .menu-toggle{display:block}
}