:root{
  --blue:#1a5fb4; --blue-d:#134a92; --bg:#f4f6f9; --card:#ffffff;
  --line:#e3e7ee; --text:#243042; --muted:#7a8699;
  --green:#1f9d55; --red:#d64545; --orange:#e8862e; --gray:#9aa5b1;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;
  background:var(--bg);color:var(--text);font-size:14px;line-height:1.6}

/* 顶栏 */
.topbar{background:var(--blue);color:#fff;display:flex;align-items:center;
  gap:24px;padding:0 24px;height:60px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px}
.logo,.login-logo{width:38px;height:38px;border-radius:9px;background:#ffffff;
  color:var(--blue);font-weight:700;display:flex;align-items:center;
  justify-content:center;font-size:20px}
.brand-title{font-weight:700;font-size:16px;line-height:1.2}
.brand-sub{font-size:11px;opacity:.85}
.nav{display:flex;gap:4px;flex:1;flex-wrap:wrap}
.nav a{color:#dce8f7;text-decoration:none;padding:6px 12px;border-radius:6px;font-size:14px}
.nav a:hover{background:rgba(255,255,255,.12);color:#fff}
.nav a.on{background:#fff;color:var(--blue);font-weight:600}
.userbox{font-size:13px;display:flex;align-items:center;gap:10px}
.logout{color:#ffd9d9;text-decoration:none}
.logout:hover{text-decoration:underline}

.container{max-width:1200px;margin:24px auto;padding:0 20px}
.footer{text-align:center;color:var(--muted);font-size:12px;padding:24px}

/* 卡片与标题 */
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:18px 20px;margin-bottom:20px;overflow-x:auto}
.card h3{font-size:15px;margin-bottom:12px}
.card.narrow{max-width:520px}
.page-title{font-size:20px;margin-bottom:16px}
.page-head{display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:10px;margin-bottom:16px}
.page-head .page-title{margin-bottom:0}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:900px){.grid-2{grid-template-columns:1fr}}

/* 统计卡片 */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:20px}
@media(max-width:800px){.stat-grid{grid-template-columns:repeat(2,1fr)}}
.stat{background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:18px;text-align:center}
.stat-num{font-size:30px;font-weight:700;color:var(--blue)}
.stat.warn .stat-num{color:var(--orange)}
.stat.danger .stat-num{color:var(--red)}
.stat-label{color:var(--muted);font-size:13px}

/* 表格 */
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
th{background:#f0f4fa;color:#4a5568;font-weight:600;white-space:nowrap}
tr:hover td{background:#f8fafc}
.muted{color:var(--muted)}
.empty{color:var(--muted);text-align:center;padding:16px}

/* 徽章 */
.badge{display:inline-block;padding:2px 8px;border-radius:10px;font-size:12px;color:#fff}
.badge.green{background:var(--green)}.badge.red{background:var(--red)}
.badge.orange{background:var(--orange)}.badge.gray{background:var(--gray)}
.badge.blue{background:var(--blue)}

/* 表单 */
label{display:block;margin:10px 0 4px;font-size:13px;color:#4a5568}
input,select,textarea{width:100%;padding:8px 10px;border:1px solid var(--line);
  border-radius:6px;font-size:14px;font-family:inherit;background:#fff}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--blue)}
.inline-form{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.inline-form input,.inline-form select{width:auto}
.inline-form label{margin:0}
.grid-form{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:10px;align-items:end}
.hint{color:var(--muted);font-size:12px;margin-top:4px}

/* 按钮 */
.btn{display:inline-block;padding:8px 16px;border:1px solid var(--line);
  border-radius:6px;background:#fff;color:var(--text);cursor:pointer;
  font-size:14px;text-decoration:none;white-space:nowrap}
.btn:hover{border-color:var(--blue);color:var(--blue)}
.btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn.primary:hover{background:var(--blue-d)}
.btn.danger{color:var(--red);border-color:#f0c8c8}
.btn.danger:hover{background:var(--red);color:#fff;border-color:var(--red)}
.btn.sm{padding:4px 10px;font-size:12px}
.btn.full{width:100%;margin-top:16px}
.btn[disabled]{opacity:.45;cursor:not-allowed}
td.ops{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
td.ops form{display:flex;gap:6px;align-items:center}
td.ops input{width:90px;padding:4px 8px;font-size:12px}
td.ops input.num{width:80px}

/* 提示 */
.flash{padding:10px 14px;border-radius:8px;margin-bottom:14px;font-size:13px}
.flash.ok{background:#e6f6ec;color:var(--green);border:1px solid #bfe6cd}
.flash.error{background:#fdecec;color:var(--red);border:1px solid #f3c2c2}

/* 登录页 */
.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;
  background:linear-gradient(135deg,#1a5fb4,#3a86d6)}
.login-card{background:#fff;border-radius:14px;padding:36px 40px;width:380px;
  box-shadow:0 10px 40px rgba(0,0,0,.18);text-align:center}
.login-logo{width:56px;height:56px;font-size:30px;margin:0 auto 14px;
  background:var(--blue);color:#fff}
.login-card h1{font-size:20px}
.login-sub{color:var(--muted);margin-bottom:18px}
.login-card form{text-align:left}
.login-tip{margin-top:16px;font-size:12px;color:var(--muted)}