* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg: #f5f7fb; --card: #fff; --line: #e5e9f0;
  --primary: #2f6bff; --primary-dark: #1f52d8;
  --danger: #e5484d; --warn: #f5a623; --ok: #30a46c;
  --text: #1b2437; --muted: #7a8699;
}
body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--text); font-size: 14px; }

.hidden { display: none !important; }

/* 登录 */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #1f52d8 0%, #2f6bff 100%); }
.login-card { background: #fff; border-radius: 16px; padding: 40px 44px; width: 360px; box-shadow: 0 20px 60px rgba(0,0,0,.25); }
.login-card h1 { font-size: 20px; margin-bottom: 6px; }
.login-card .sub { color: var(--muted); margin-bottom: 26px; }
.login-card input { display: block; width: 100%; padding: 12px 14px; margin-bottom: 14px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px; }
.login-card input:focus { outline: none; border-color: var(--primary); }
.login-card button { width: 100%; padding: 12px; background: var(--primary); color: #fff; border: none; border-radius: 8px; font-size: 15px; cursor: pointer; }
.login-card button:hover { background: var(--primary-dark); }
.err { color: var(--danger); margin-top: 10px; min-height: 18px; }

/* 布局 */
.app { display: flex; min-height: 100vh; }
.sidebar { width: 220px; background: #131c2e; color: #cbd5e1; flex-shrink: 0; }
.brand { padding: 20px 18px; font-size: 16px; font-weight: 600; color: #fff; border-bottom: 1px solid rgba(255,255,255,.08); }
#nav a { display: block; padding: 12px 20px; color: #cbd5e1; text-decoration: none; border-left: 3px solid transparent; }
#nav a:hover { background: rgba(255,255,255,.06); }
#nav a.active { background: rgba(47,107,255,.18); color: #fff; border-left-color: var(--primary); }
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar { height: 56px; background: var(--card); border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; padding: 0 24px; }
.topbar #pageTitle { font-size: 16px; font-weight: 600; }
.user-box { display: flex; align-items: center; gap: 12px; color: var(--muted); }
.link { background: none; border: none; color: var(--primary); cursor: pointer; font-size: 14px; }
.content { padding: 24px; }

/* 卡片 */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 16px; margin-bottom: 24px; }
.card { background: var(--card); border-radius: 12px; padding: 18px 20px; box-shadow: 0 2px 8px rgba(20,30,60,.05); }
.card .num { font-size: 26px; font-weight: 700; margin-top: 6px; }
.card .lbl { color: var(--muted); font-size: 13px; }
.card.danger .num { color: var(--danger); }
.card.ok .num { color: var(--ok); }

/* 表格 */
.panel { background: var(--card); border-radius: 12px; padding: 20px; margin-bottom: 24px; box-shadow: 0 2px 8px rgba(20,30,60,.05); }
.panel h3 { margin-bottom: 16px; font-size: 15px; }
.panel-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.panel-head h3 { margin: 0; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--muted); font-weight: 500; font-size: 13px; background: #fafbfe; }
tr:hover td { background: #f7f9ff; }

/* 表单 */
.form-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin-bottom: 14px; }
.form-grid label { display: flex; flex-direction: column; gap: 6px; color: var(--muted); font-size: 13px; }
input, select { padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px; background: #fff; color: var(--text); }
input:focus, select:focus { outline: none; border-color: var(--primary); }
input.inline { width: 120px; }

/* 按钮 */
.btn { padding: 8px 16px; border: none; border-radius: 8px; background: var(--primary); color: #fff; cursor: pointer; font-size: 14px; }
.btn:hover { background: var(--primary-dark); }
.btn.ghost { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.btn.danger { background: var(--danger); }
.btn.sm { padding: 5px 10px; font-size: 13px; }
.btn.ok { background: var(--ok); }

/* 标签 */
.tag { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; }
.tag.ok { background: #e8f6ef; color: var(--ok); }
.tag.warn { background: #fdf3e1; color: var(--warn); }
.tag.danger { background: #fdecec; color: var(--danger); }
.tag.info { background: #eaf1ff; color: var(--primary); }

/* 套餐卡 */
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 18px; }
.plan { border: 1px solid var(--line); border-radius: 12px; padding: 18px; cursor: pointer; transition: .15s; background: #fff; }
.plan:hover { border-color: var(--primary); box-shadow: 0 4px 14px rgba(47,107,255,.12); }
.plan.selected { border-color: var(--primary); background: #f0f5ff; }
.plan .price { font-size: 24px; font-weight: 700; color: var(--primary); }
.plan .desc { color: var(--muted); margin-top: 6px; }

/* Toast */
.toast { position: fixed; top: 20px; left: 50%; transform: translateX(-50%); background: #1b2437; color: #fff; padding: 10px 22px; border-radius: 8px; z-index: 999; }
.toast.err { background: var(--danger); }
.toast.ok { background: var(--ok); }

.empty { color: var(--muted); text-align: center; padding: 30px; }