/* ===========================================================
   EE 接码系统 - 商业化扁平设计
   配色: 深蓝主色 + 中性灰, 无渐变滥用, 清晰边框层级
   =========================================================== */
:root{
  --bg:#f4f6f9;
  --panel:#ffffff;
  --line:#e4e8ef;
  --text:#1f2733;
  --muted:#6b7480;
  --primary:#1f4fd8;
  --primary-d:#1740b0;
  --primary-soft:#eaf0ff;
  --sidebar:#16203a;
  --sidebar-line:#24304f;
  --ok:#1f9d55;
  --warn:#d98a00;
  --err:#d83a3a;
  --radius:10px;
  --shadow:0 1px 3px rgba(16,24,40,.06),0 1px 2px rgba(16,24,40,.04);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);font-size:14px;line-height:1.6;display:flex;min-height:100vh}

/* 侧边栏 */
.sidebar{width:230px;background:var(--sidebar);color:#cfd6e4;display:flex;flex-direction:column;
  position:sticky;top:0;height:100vh;flex-shrink:0}
.brand{display:flex;align-items:center;gap:10px;padding:20px 18px;font-size:16px;font-weight:700;
  color:#fff;border-bottom:1px solid var(--sidebar-line)}
.brand svg{color:var(--primary)}
.nav{padding:12px 10px;flex:1;overflow:auto}
.nav-item{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:8px;color:#b8c1d4;
  text-decoration:none;margin-bottom:4px;font-weight:500;transition:.15s}
.nav-item svg{color:#7e8aa3;flex-shrink:0}
.nav-item:hover{background:#1e2b49;color:#fff}
.nav-item:hover svg{color:#fff}
.nav-item.active{background:var(--primary);color:#fff}
.nav-item.active svg{color:#fff}
.sidebar-foot{padding:14px 16px;border-top:1px solid var(--sidebar-line);font-size:13px}
.sidebar-foot .who,.sidebar-foot .bal{display:flex;align-items:center;gap:8px;color:#cfd6e4;margin-bottom:8px}
.sidebar-foot .bal svg{color:var(--primary)}
.sidebar-foot .logout{display:flex;align-items:center;gap:8px;color:#9aa6bd;text-decoration:none}
.sidebar-foot .logout:hover{color:#fff}

/* 主区 */
.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{background:var(--panel);border-bottom:1px solid var(--line);padding:16px 28px}
.topbar h1{font-size:18px;font-weight:700}
.content{padding:24px 28px;flex:1}
.footer{padding:16px 28px;color:var(--muted);font-size:12px;border-top:1px solid var(--line);background:var(--panel)}

/* 卡片 */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:20px;margin-bottom:20px}
.card h2{font-size:15px;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.card h2 svg{color:var(--primary)}
.card-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.card-head h2{margin-bottom:0}
.modal-foot{display:flex;gap:10px;justify-content:flex-end;margin-top:18px}

/* 网格 */
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:1000px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.sidebar{display:none}}

/* 统计块 */
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:6px}
.stat .label{color:var(--muted);font-size:13px;display:flex;align-items:center;gap:7px}
.stat .label svg{color:var(--primary)}
.stat .value{font-size:26px;font-weight:700;letter-spacing:.5px}
.stat .sub{font-size:12px;color:var(--muted)}

/* 按钮 */
.btn{display:inline-flex;align-items:center;gap:7px;padding:9px 16px;border-radius:8px;border:1px solid transparent;
  font-size:13px;font-weight:600;cursor:pointer;text-decoration:none;transition:.15s;background:var(--primary);color:#fff}
.btn svg{color:#fff}
.btn:hover{background:var(--primary-d)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
.btn-ghost:hover{background:#f0f3f8;border-color:#d4dae4}
.btn-ghost svg{color:var(--muted)}
.btn-sm{padding:6px 11px;font-size:12px}
.btn-danger{background:var(--err)}
.btn-danger:hover{background:#b62f2f}
.btn-danger svg{color:#fff}
.btn-success{background:var(--ok)}
.btn:disabled,.btn.is-loading{cursor:not-allowed;opacity:.7}
.btn.is-loading svg{animation:spin 1s linear infinite}
@keyframes spin{from{transform:rotate(0)}to{transform:rotate(360deg)}}
.btn-success:hover{background:#178042}
.btn-block{width:100%;justify-content:center}

/* 表单 */
.form-row{margin-bottom:14px}
.form-row label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--text)}
.form-row .hint{font-size:12px;color:var(--muted);margin-top:4px}
input[type=text],input[type=password],input[type=number],input[type=email],select,textarea{
  width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:14px;
  background:#fff;color:var(--text);transition:.15s;font-family:inherit}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}
.form-inline{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap}

/* 表格 */
.table{width:100%;border-collapse:collapse;font-size:13px}
.table th{text-align:left;padding:11px 12px;background:#f7f9fc;border-bottom:1px solid var(--line);
  color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.4px}
.table td{padding:11px 12px;border-bottom:1px solid var(--line)}
.table tr:hover td{background:#fafbfd}
.table .mono{font-family:ui-monospace,Menlo,Consolas,monospace}

/* 标签 */
.tag{display:inline-flex;align-items:center;gap:5px;padding:3px 9px;border-radius:20px;font-size:12px;font-weight:600}
.tag-ok{background:#e7f6ee;color:var(--ok)}
.tag-warn{background:#fdf2e0;color:var(--warn)}
.tag-err{background:#fdeaea;color:var(--err)}
.tag-info{background:var(--primary-soft);color:var(--primary)}

/* 提示 */
.alert{display:flex;align-items:center;gap:9px;padding:12px 14px;border-radius:8px;margin-bottom:16px;font-size:13px}
.alert-info{background:var(--primary-soft);color:var(--primary-d)}
.alert-error{background:#fdeaea;color:var(--err)}
.alert-success{background:#e7f6ee;color:var(--ok)}

/* 登录页 */
.login-wrap{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px;
  background:linear-gradient(135deg,#16203a,#1f4fd8)}
.login-card{width:380px;max-width:100%;background:#fff;border-radius:14px;padding:34px;box-shadow:0 12px 40px rgba(0,0,0,.25)}
.login-card .brand{justify-content:center;border:none;color:var(--text);margin-bottom:6px;padding:0}
.login-card .brand svg{color:var(--primary)}
.login-sub{text-align:center;color:var(--muted);font-size:13px;margin-bottom:22px}

/* 杂项 */
.muted{color:var(--muted)}
.right{text-align:right}
.flex{display:flex;align-items:center;gap:10px}
.between{justify-content:space-between}
.wrap{display:flex;flex-wrap:wrap;gap:10px}
.empty{padding:40px;text-align:center;color:var(--muted)}
.pill{font-family:ui-monospace,Menlo,Consolas,monospace;background:#f0f3f8;padding:2px 8px;border-radius:6px;font-size:12px}
.section-title{font-size:14px;font-weight:700;margin:4px 0 14px;display:flex;align-items:center;gap:8px}
.section-title svg{color:var(--primary)}
.modal-mask{position:fixed;inset:0;background:rgba(16,24,40,.5);display:none;align-items:center;justify-content:center;z-index:50}
.modal-mask.show{display:flex}
.modal{background:#fff;border-radius:12px;width:440px;max-width:92%;padding:24px}
.modal h3{margin-bottom:16px;font-size:16px}