:root {
  --blue: #2E7CF6; --blue-d: #1E5FD0; --bg: #F4F7FB; --card: #fff;
  --txt: #1F2D3D; --muted: #7A8BA6; --line: #E4EBF4; --ok: #22B573; --err: #E5484D;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font: 15px/1.6 "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--txt); background: var(--bg); }
a { color: var(--blue); text-decoration: none; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* 顶部导航 */
.nav { background: var(--card); border-bottom: 1px solid var(--line); }
.nav .container { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-size: 19px; font-weight: 700; color: var(--blue); }
.nav nav a { margin-left: 22px; color: var(--muted); font-weight: 500; padding: 6px 2px; }
.nav nav a.active, .nav nav a:hover { color: var(--blue); border-bottom: 2px solid var(--blue); }

/* 前台 */
.front main { padding: 40px 20px 60px; min-height: calc(100vh - 130px); }
.hero { text-align: center; padding: 50px 0 30px; }
.hero h1 { font-size: 34px; color: var(--blue-d); }
.hero .lead { margin: 14px 0 26px; color: var(--muted); font-size: 16px; }
.features { display: flex; gap: 16px; margin-top: 24px; flex-wrap: wrap; }
.features .card { flex: 1; min-width: 240px; text-align: center; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 22px; margin-top: 16px; }
.card h3 { margin-bottom: 8px; }
.muted { color: var(--muted); font-size: 14px; }
.notice { color: #445; }
.query-box input { width: 70%; padding: 11px 14px; border: 1px solid var(--line); border-radius: 8px; font-size: 15px; }
.query-box form { display: flex; gap: 10px; margin-top: 14px; }
.result h3 { margin-bottom: 10px; color: var(--ok); }
.content-box { background: #F0F7FF; border: 1px dashed #BBD8F8; padding: 10px; border-radius: 8px; word-break: break-all; }
.footer { border-top: 1px solid var(--line); background: var(--card); padding: 18px 0; color: var(--muted); font-size: 13px; text-align: center; }

/* 按钮/表单 */
.btn { display: inline-block; padding: 10px 20px; border-radius: 8px; border: none; cursor: pointer; font-size: 15px; background: #EDF1F7; color: var(--txt); }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-d); }
.btn-sm { padding: 5px 12px; font-size: 13px; border-radius: 6px; }
.btn-danger { background: #FDEBEC; color: var(--err); }
input, select, textarea { font: inherit; padding: 9px 12px; border: 1px solid var(--line); border-radius: 8px; width: 100%; background: #fff; }
textarea { min-height: 80px; resize: vertical; }
.form-row { margin-bottom: 14px; }
.form-row label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 14px; }

/* 后台布局 */
.admin-body { display: flex; min-height: 100vh; }
.sidebar { width: 210px; background: #1F2D3D; color: #C7D2E0; flex-shrink: 0; }
.sidebar .logo { padding: 20px; font-size: 18px; font-weight: 700; color: #fff; border-bottom: 1px solid #2C3E52; }
.sidebar a { display: block; padding: 13px 22px; color: #C7D2E0; font-size: 14.5px; }
.sidebar a.active, .sidebar a:hover { background: var(--blue); color: #fff; }
.main { flex: 1; padding: 24px 28px; }
.main h2 { font-size: 21px; margin-bottom: 18px; }
.stat-grid { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 8px; }
.stat { flex: 1; min-width: 180px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; }
.stat .num { font-size: 28px; font-weight: 800; color: var(--blue); }
.stat .lbl { color: var(--muted); font-size: 13px; }

/* 表格 */
.table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.table th, .table td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--line); font-size: 14px; vertical-align: top; }
.table th { background: #F8FAFD; color: var(--muted); font-weight: 600; }
.table tr:last-child td { border-bottom: none; }

/* 状态标签 */
.tag { display: inline-block; padding: 2px 10px; border-radius: 99px; font-size: 12.5px; }
.tag-on { background: #E3F7EE; color: var(--ok); }
.tag-off { background: #F0F2F6; color: var(--muted); }
.tag-warn { background: #FFF4E0; color: #C77700; }

/* flash 提示 */
.flash { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.flash-ok { background: #E3F7EE; color: #16794E; }
.flash-err { background: #FDEBEC; color: #B03A3E; }

/* 登录页 */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #2E7CF6 0%, #6FB1FF 100%); }
.login-card { width: 360px; background: #fff; border-radius: 14px; padding: 34px 30px; }
.login-card h1 { text-align: center; font-size: 22px; margin-bottom: 22px; color: var(--blue-d); }
.login-card input { margin-bottom: 14px; }
.toolbar { display: flex; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; align-items: center; }
.toolbar form { display: flex; gap: 8px; }
.toolbar input, .toolbar select { width: auto; }