:root{
  --bg:#f5f6f8; --card:#ffffff; --border:#e5e7eb; --text:#111827; --sub:#6b7280;
  --primary:#2563eb; --primary-dark:#1d4ed8; --primary-light:#eff6ff;
  --ok:#16a34a; --warn:#ea580c; --danger:#dc2626;
  --sidebar:#111827; --sidebar-text:#9ca3af;
  --radius:10px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei UI","PingFang SC",sans-serif;
  background:var(--bg); color:var(--text); font-size:14px; line-height:1.6;
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}

/* ---------- 布局 ---------- */
.layout{display:flex;min-height:100vh}
.sidebar{
  width:220px;background:var(--sidebar);color:#fff;padding:20px 0;flex-shrink:0;
  display:flex;flex-direction:column;
}
.sidebar .brand{padding:0 20px 20px;font-size:15px;font-weight:600;letter-spacing:.3px}
.sidebar .brand small{display:block;color:var(--sidebar-text);font-size:11px;font-weight:400;margin-top:2px}
.sidebar nav{flex:1}
.sidebar nav a{
  display:block;padding:10px 20px;color:var(--sidebar-text);font-size:13.5px;
  border-left:3px solid transparent;
}
.sidebar nav a:hover{background:#1f2937;color:#fff;text-decoration:none}
.sidebar nav a.active{background:#1f2937;color:#fff;border-left-color:var(--primary)}
.sidebar .foot{padding:12px 20px;border-top:1px solid #1f2937;font-size:12px;color:var(--sidebar-text)}
.sidebar .foot a{color:var(--sidebar-text)}
.sidebar .foot a:hover{color:#fff}

.main{flex:1;padding:24px 32px;max-width:1180px}
.page-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;gap:12px;flex-wrap:wrap}
.page-head h1{font-size:20px;font-weight:600}
.page-head .sub{color:var(--sub);font-size:13px;margin-top:2px}

/* ---------- 卡片 ---------- */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.card + .card{margin-top:16px}
.card h2{font-size:15px;font-weight:600;margin-bottom:14px}

.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}

/* ---------- 统计块 ---------- */
.stat{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px}
.stat .label{color:var(--sub);font-size:12.5px}
.stat .value{font-size:24px;font-weight:600;margin-top:4px;letter-spacing:-.5px}
.stat .value.small{font-size:18px}

/* ---------- 表格 ---------- */
table{width:100%;border-collapse:collapse;font-size:13.5px}
th{text-align:left;color:var(--sub);font-weight:500;font-size:12.5px;padding:8px 10px;border-bottom:1px solid var(--border)}
td{padding:10px;border-bottom:1px solid #f3f4f6}
tr:last-child td{border-bottom:none}
tbody tr:hover{background:#fafbfc}

/* ---------- 表单 ---------- */
.form-row{margin-bottom:14px}
.form-row label{display:block;font-size:13px;margin-bottom:5px;color:#374151}
.form-row .hint{font-size:12px;color:var(--sub);margin-top:4px}
input[type=text],input[type=email],input[type=password],input[type=number],select,textarea{
  width:100%;padding:9px 12px;border:1px solid var(--border);border-radius:8px;
  font-size:14px;font-family:inherit;background:#fff;outline:none;transition:border-color .15s;
}
input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
textarea{resize:vertical;min-height:80px}

.btn{
  display:inline-block;padding:9px 18px;border-radius:8px;border:1px solid transparent;
  font-size:13.5px;font-weight:500;cursor:pointer;background:var(--primary);color:#fff;
  transition:background .15s;font-family:inherit;line-height:1.4;
}
.btn:hover{background:var(--primary-dark);text-decoration:none;color:#fff}
.btn.secondary{background:#fff;color:var(--text);border-color:var(--border)}
.btn.secondary:hover{background:#f9fafb;color:var(--text)}
.btn.danger{background:var(--danger)}
.btn.sm{padding:5px 12px;font-size:12.5px}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ---------- 徽标 ---------- */
.badge{display:inline-block;padding:2px 8px;border-radius:20px;font-size:12px;font-weight:500}
.badge.ok{background:#dcfce7;color:#166534}
.badge.pending{background:#fef3c7;color:#92400e}
.badge.fail{background:#fee2e2;color:#991b1b}
.badge.info{background:var(--primary-light);color:var(--primary-dark)}
.badge.gray{background:#f3f4f6;color:#4b5563}

/* ---------- 空状态 ---------- */
.empty{text-align:center;padding:48px 20px;color:var(--sub)}
.empty .icon{font-size:36px;margin-bottom:10px;opacity:.35}
.empty p{margin-bottom:14px}

/* ---------- 提示 ---------- */
.alert{padding:11px 14px;border-radius:8px;font-size:13.5px;margin-bottom:16px}
.alert.error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.alert.ok{background:#f0fdf4;color:#166534;border:1px solid #bbf7d0}
.alert.info{background:var(--primary-light);color:#1e40af;border:1px solid #bfdbfe}

/* ---------- 登录页 ---------- */
.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.auth-card{width:100%;max-width:400px;background:#fff;border:1px solid var(--border);border-radius:14px;padding:32px}
.auth-card h1{font-size:20px;font-weight:600;text-align:center;margin-bottom:6px}
.auth-card .sub{text-align:center;color:var(--sub);font-size:13px;margin-bottom:24px}
.auth-card .foot{text-align:center;font-size:13px;color:var(--sub);margin-top:18px}

/* ---------- 套餐卡 ---------- */
.plan{background:#fff;border:1px solid var(--border);border-radius:12px;padding:22px;position:relative;display:flex;flex-direction:column}
.plan.featured{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.08)}
.plan .tag{position:absolute;top:-10px;right:16px;background:var(--primary);color:#fff;font-size:11px;padding:2px 10px;border-radius:20px}
.plan h3{font-size:16px;font-weight:600;margin-bottom:4px}
.plan .desc{color:var(--sub);font-size:12.5px;min-height:34px}
.plan .price{font-size:28px;font-weight:600;margin:14px 0 4px;letter-spacing:-1px}
.plan .price small{font-size:13px;font-weight:400;color:var(--sub)}
.plan ul{list-style:none;margin:16px 0;flex:1}
.plan ul li{font-size:13px;padding:5px 0 5px 20px;position:relative;color:#374151}
.plan ul li:before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:600}

.muted{color:var(--sub);font-size:13px}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px}
.mt{margin-top:16px}
.mb{margin-bottom:16px}
.flex{display:flex;gap:10px;align-items:center}
.flex-between{display:flex;gap:10px;align-items:center;justify-content:space-between}