:root {
  --bg: #0f1117; --card: #1a1d28; --border: #2a2d3a; --text: #e0e0e0;
  --text2: #8b8fa3; --accent: #4f8ff7; --accent2: #6c5ce7;
  --danger: #e74c3c; --success: #2ecc71; --warn: #f39c12;
  --radius: 8px;
  --sidebar-w: 220px;
  --topbar-h: 56px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }

/* ─── 登录页 ─── */
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(135deg, #0f1117 0%, #1a1d28 50%, #0f1117 100%); }
.login-box { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 40px 36px; width: 400px; max-width: 92vw; }
.login-box h2 { font-size: 22px; text-align: center; margin-bottom: 8px; }
.login-box .sub { text-align: center; color: var(--text2); font-size: 14px; margin-bottom: 28px; }
.login-box .form-group { margin-bottom: 18px; }
.login-box label { display: block; font-size: 13px; color: var(--text2); margin-bottom: 6px; }
.login-box input { width: 100%; padding: 10px 14px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg); color: var(--text); font-size: 14px; outline: none; }
.login-box input:focus { border-color: var(--accent); }
.login-box .btn-login { width: 100%; padding: 12px; border: none; border-radius: var(--radius); background: var(--accent); color: #fff; font-size: 15px; font-weight: 600; cursor: pointer; transition: background .15s; }
.login-box .btn-login:hover { background: #3a7ae0; }
.login-box .btn-login:disabled { opacity: .6; cursor: not-allowed; }

/* ─── 布局 ─── */
.app-layout { display: flex; min-height: 100vh; }
.sidebar { width: var(--sidebar-w); background: var(--card); border-right: 1px solid var(--border); display: flex; flex-direction: column; position: fixed; top: 0; left: 0; bottom: 0; z-index: 100; transition: width .25s ease, transform .3s; overflow: hidden; }
.sidebar.collapsed { width: 56px; }
.sidebar.collapsed .sidebar-header h1 { opacity: 0; width: 0; overflow: hidden; }
.sidebar.collapsed .nav-item span:not(.nav-arrow) { opacity: 0; width: 0; overflow: hidden; }
.sidebar.collapsed .nav-arrow { opacity: 0; width: 0; overflow: hidden; }
.sidebar.collapsed .nav-children { display: none; }
.sidebar.collapsed .nav-item { justify-content: center; padding: 10px 0; }
.sidebar.collapsed .nav-item span:not(.nav-arrow) { opacity: 0; width: 0; overflow: hidden; }
.sidebar.collapsed .nav-group-label { display: none; }
.sidebar-header { padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.sidebar-header .logo { width: 28px; height: 28px; background: var(--accent); border-radius: 6px; display: flex; align-items: center; justify-content: center; font-weight: 700; color: #fff; font-size: 14px; flex-shrink: 0; }
.sidebar-header h1 { font-size: 16px; font-weight: 600; white-space: nowrap; transition: opacity .2s, width .2s; }
.sidebar-nav { flex: 1; padding: 12px 0; overflow-y: auto; overflow-x: hidden; }
.nav-group-label { padding: 8px 20px 6px; font-size: 11px; color: var(--text2); text-transform: uppercase; letter-spacing: .5px; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 10px 20px; font-size: 14px; color: var(--text2); cursor: pointer; transition: all .15s; border-left: 3px solid transparent; user-select: none; }
.nav-item:hover { color: var(--text); background: rgba(255,255,255,.03); }
.nav-item.active { color: var(--accent); background: rgba(79,143,247,.08); border-left-color: var(--accent); }
.nav-item .nav-arrow { margin-left: auto; font-size: 10px; transition: transform .25s; color: var(--text2); }
.nav-item.open .nav-arrow { transform: rotate(90deg); }
.nav-children { max-height: 0; overflow: hidden; transition: max-height .25s ease; }
.nav-children.open { max-height: 500px; }
.nav-children .nav-item { font-size: 13px; padding: 8px 20px 8px 32px; }

.main-area { flex: 1; margin-left: var(--sidebar-w); display: flex; flex-direction: column; min-height: 100vh; transition: margin-left .25s ease; }
.main-area.sidebar-collapsed { margin-left: 56px; }

/* ─── 侧边栏拖拽分隔条 ─── */
.sidebar-resizer { position: fixed; top: 0; bottom: 0; width: 5px; cursor: col-resize; z-index: 101; transition: background .15s; background: transparent; }
.sidebar-resizer:hover, .sidebar-resizer.dragging { background: var(--accent); }
.sidebar-resizer.sidebar-collapsed-pos { left: 56px !important; }

/* ─── 顶栏折叠按钮 ─── */
.btn-collapse { width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; border-radius: 6px; border: 1px solid var(--border); background: transparent; cursor: pointer; transition: all .15s; color: var(--text2); font-size: 16px; flex-shrink: 0; }
.btn-collapse:hover { color: var(--text); border-color: var(--text2); background: rgba(255,255,255,.04); }
.topbar { background: var(--card); border-bottom: 1px solid var(--border); padding: 0 24px; height: var(--topbar-h); display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 50; }
.topbar .left { display: flex; align-items: center; gap: 12px; }
.topbar h2 { font-size: 17px; font-weight: 600; }
.topbar .right { display: flex; align-items: center; gap: 12px; }
.topbar .status { font-size: 13px; color: var(--text2); }
.user-menu { position: relative; }
.user-menu-trigger { display: flex; align-items: center; gap: 8px; cursor: pointer; padding: 6px 12px; border-radius: 6px; border: 1px solid var(--border); font-size: 13px; color: var(--text); transition: all .15s; background: transparent; }
.user-menu-trigger:hover { border-color: var(--text2); }
.user-dropdown { display: none; position: absolute; right: 0; top: 100%; margin-top: 6px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); min-width: 160px; box-shadow: 0 8px 24px rgba(0,0,0,.4); z-index: 60; }
.user-dropdown.show { display: block; }
.user-dropdown .dropdown-item { display: block; width: 100%; text-align: left; padding: 10px 16px; font-size: 13px; color: var(--text); background: none; border: none; cursor: pointer; transition: background .1s; }
.user-dropdown .dropdown-item:hover { background: rgba(255,255,255,.06); }
.user-dropdown .dropdown-item.danger { color: var(--danger); }
.user-dropdown .dropdown-divider { border-top: 1px solid var(--border); margin: 4px 0; }

.content { flex: 1; padding: 24px; }

/* ─── 通用组件 ─── */
.btn { padding: 8px 16px; border-radius: var(--radius); border: none; cursor: pointer; font-size: 13px; font-weight: 500; transition: all .15s; display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #3a7ae0; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #c0392b; }
.btn-warn { background: var(--warn); color: #fff; }
.btn-ghost { background: transparent; color: var(--text2); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--text2); }
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-icon { width: 32px; height: 32px; padding: 0; display: inline-flex; align-items: center; justify-content: center; border-radius: 6px; border: 1px solid var(--border); background: transparent; cursor: pointer; transition: all .15s; color: var(--text2); font-size: 14px; }
.btn-icon:hover { color: var(--text); border-color: var(--text2); background: rgba(255,255,255,.04); }
.btn-icon.danger:hover { color: var(--danger); border-color: var(--danger); background: rgba(231,76,60,.08); }
.btn-icon.warn:hover { color: var(--warn); border-color: var(--warn); background: rgba(243,156,18,.08); }
.btn-icon.success:hover { color: var(--success); border-color: var(--success); background: rgba(46,204,113,.08); }

/* 操作按钮 tooltip */
.btn-icon[data-tip] { position: relative; }
.btn-icon[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #1a1a2e;
  color: #fff;
  font-size: 12px;
  line-height: 1;
  padding: 5px 8px;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity .15s;
  z-index: 999;
}
.btn-icon[data-tip]:hover::after { opacity: 1; }

.stats-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.stat-card .label { font-size: 13px; color: var(--text2); margin-bottom: 8px; }
.stat-card .value { font-size: 28px; font-weight: 700; }
.stat-card .value.accent { color: var(--accent); }
.stat-card .value.success { color: var(--success); }
.stat-card .value.warn { color: var(--warn); }

.table-wrap { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.table-scroll { overflow-x: auto; }
.table-toolbar { padding: 16px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border); }
.table-toolbar h2 { font-size: 15px; font-weight: 600; }
table { width: 100%; border-collapse: collapse; min-width: 640px; }
th, td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 13px; }
th { color: var(--text2); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; background: rgba(255,255,255,.02); }
tr:hover td { background: rgba(79, 143, 247, 0.04); }
tr:last-child td { border-bottom: none; }

td.cell-email { max-width: 260px; word-break: break-all; white-space: normal; font-size: 12px; font-family: "SF Mono","Fira Code","Consolas",monospace; }
td.cell-actions { white-space: nowrap; }
.cell-actions .actions-group { display: flex; gap: 6px; align-items: center; }

.badge { padding: 3px 10px; border-radius: 4px; font-size: 11px; font-weight: 600; display: inline-block; }
.badge-on { background: rgba(46,204,113,.15); color: var(--success); }
.badge-off { background: rgba(231,76,60,.15); color: var(--danger); }
.badge-tag { background: rgba(79,143,247,.12); color: var(--accent); }
.badge-expired { background: rgba(231,76,60,.1); color: var(--danger); font-size: 10px; }

/* 弹窗 */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.6); z-index: 200; justify-content: center; align-items: center; }
.modal-overlay.show { display: flex; }
.modal { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); width: 520px; max-width: 92vw; max-height: 90vh; overflow-y: auto; }
.modal-header { padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
.modal-header h3 { font-size: 15px; }
.modal-body { padding: 20px; }
.modal-footer { padding: 12px 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; }

.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; color: var(--text2); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 8px 12px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg); color: var(--text); font-size: 13px; outline: none; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--accent); }
.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }

.toast-container { position: fixed; top: 70px; right: 24px; z-index: 300; }
.toast { padding: 12px 20px; border-radius: var(--radius); margin-bottom: 8px; font-size: 13px; animation: slideIn .3s; }
.toast-success { background: var(--success); color: #fff; }
.toast-error { background: var(--danger); color: #fff; }
@keyframes slideIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }
@keyframes spin { to { transform: rotate(360deg); } }

.traffic-bar { height: 4px; background: var(--border); border-radius: 2px; margin-top: 4px; }
.traffic-bar-fill { height: 100%; border-radius: 2px; background: var(--accent); transition: width .3s; }
.traffic-bar-fill.warn { background: var(--warn); }
.traffic-bar-fill.danger { background: var(--danger); }

.empty { text-align: center; padding: 60px 20px; color: var(--text2); }
.close-btn { background: none; border: none; color: var(--text2); font-size: 20px; cursor: pointer; padding: 4px; }
.close-btn:hover { color: var(--text); }
.log-table td { font-family: "SF Mono","Fira Code","Consolas",monospace; font-size: 12px; }

.user-info { display: flex; flex-direction: column; gap: 2px; }
.user-info .name { font-weight: 500; color: var(--text); }
.user-info .sub { font-size: 11px; color: var(--text2); }

/* 详情弹窗 */
.detail-section { margin-bottom: 18px; }
.detail-section h4 { font-size: 13px; color: var(--accent); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.5px; display: flex; align-items: center; justify-content: space-between; }
.detail-section h4 .section-actions { display: flex; gap: 6px; }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; }
.detail-item { font-size: 13px; }
.detail-item .dl { color: var(--text2); font-size: 11px; margin-bottom: 2px; }
.detail-item .dv { color: var(--text); font-weight: 500; word-break: break-all; }
.detail-item .dv.expired { color: var(--danger); }

.edit-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 16px; }
.edit-grid .form-group { margin-bottom: 0; }
.edit-grid .form-group.full-width { grid-column: 1 / -1; }
.edit-grid .form-group label { font-size: 11px; margin-bottom: 4px; }
.edit-grid .form-group input, .edit-grid .form-group select { padding: 6px 10px; font-size: 13px; }

.btn-tiny { padding: 3px 10px; border-radius: 4px; border: 1px solid var(--border); background: transparent; color: var(--text2); font-size: 11px; cursor: pointer; transition: all .15s; }
.btn-tiny:hover { color: var(--text); border-color: var(--text2); }
.btn-tiny.primary { border-color: var(--accent); color: var(--accent); }
.btn-tiny.primary:hover { background: var(--accent); color: #fff; }

.sub-link-box { display: flex; gap: 8px; align-items: center; margin-top: 6px; }
.sub-link-box input { flex: 1; padding: 6px 10px; border-radius: 4px; border: 1px solid var(--border); background: var(--bg); color: var(--accent); font-size: 12px; font-family: monospace; }

/* 仪表盘 */
.dashboard-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-bottom: 24px; }
.dash-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; display: flex; flex-direction: column; gap: 12px; }
.dash-card .dash-header { display: flex; justify-content: space-between; align-items: center; }
.dash-card .dash-title { font-size: 14px; color: var(--text2); }
.dash-card .dash-value { font-size: 32px; font-weight: 700; }
.dash-card .dash-sub { font-size: 12px; color: var(--text2); }

/* 页面区域 */
.page-section { display: none; }
.page-section.active { display: block; }

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-area { margin-left: 0 !important; }
  .sidebar-resizer { display: none; }
  .content { padding: 16px 12px; }
  .stats-row { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .detail-grid { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; gap: 0; }
}