/* ==========================================================================
   monitor Admin · 新版 UI 样式
   设计理念：高端、简洁、清爽 · 浅色侧边栏（Frigate 风格）
   ========================================================================== */

/* ---------- CSS 变量 ---------- */
:root {
    /* 主色调 */
    --c-primary: #169F85;
    --c-primary-hover: #14b89a;
    --c-primary-light: #e6f7f3;
    --c-primary-border: #8edbc8;

    /* 中性色 */
    --c-bg: #f1f5f9;
    --c-surface: #ffffff;
    --c-sidebar: #fbfbfb;
    --c-sidebar-hover: #f1f5f9;
    --c-sidebar-active: #eef1f4;
    --c-sidebar-accent: #4f6ef7;

    /* 文字 */
    --c-text: #0f172a;
    --c-text-secondary: #64748b;
    --c-text-tertiary: #94a3b8;
    --c-text-inverse: #ffffff;
    --c-text-sidebar: #4d5666;
    --c-text-sidebar-muted: rgba(77, 86, 102, 0.65);
    --c-text-sidebar-active: #0f172a;

    /* 边框 */
    --c-border: #e2e8f0;
    --c-border-light: #f1f5f9;

    /* 状态色（克制使用） */
    --c-success: #0e7a65;
    --c-success-bg: #e6f7f3;
    --c-warning: #b45309;
    --c-warning-bg: #fffbeb;
    --c-danger: #b91c1c;
    --c-danger-bg: #fef2f2;
    --c-info: #0e7a65;

    /* 圆角 */
    --r-sm: 4px;
    --r-md: 6px;
    --r-lg: 10px;
    --r-xl: 14px;

    /* 阴影 */
    --sh-sm: 0 1px 2px rgba(0,0,0,.04);
    --sh-md: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --sh-lg: 0 4px 12px rgba(0,0,0,.08);
    --sh-xl: 0 8px 24px rgba(0,0,0,.10);

    /* 间距 */
    --sp-sidebar-full: 200px;
    --sp-sidebar-rail: 52px;
    --sp-sidebar: var(--sp-sidebar-rail);

    /* 过渡 */
    --tr: .18s ease;
    --tr-sidebar: .22s ease;
}

html.sidebar-expanded { --sp-sidebar: var(--sp-sidebar-full); }
html.sidebar-collapsed { --sp-sidebar: var(--sp-sidebar-rail); }

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 14px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: var(--c-bg);
    color: var(--c-text);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--c-primary); text-decoration: none; transition: color var(--tr); }
a:hover { color: var(--c-primary-hover); }

ul, ol { list-style: none; }

img { max-width: 100%; display: block; }

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

/* ==========================================================================
   布局
   ========================================================================== */

/* ---------- 侧边栏 ---------- */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sp-sidebar);
    background: var(--c-sidebar);
    border-right: 1px solid #eef0f3;
    z-index: 100;
    display: flex;
    flex-direction: column;
    transition: width var(--tr-sidebar);
    overflow: hidden;
}

.sidebar-brand {
    min-height: 56px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
    border-bottom: 1px solid var(--c-border);
    flex-shrink: 0;
}

.sidebar-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    border: none;
    border-radius: 6px;
    background: var(--c-sidebar-active);
    color: var(--c-text-secondary);
    cursor: pointer;
    flex-shrink: 0;
    transition: background var(--tr), color var(--tr);
}
.sidebar-toggle:hover {
    background: var(--c-sidebar-hover);
    color: var(--c-text);
}
.sidebar-toggle svg {
    width: 18px;
    height: 18px;
    display: block;
}
html.sidebar-collapsed .sidebar-toggle .icon-collapse { display: none; }
html.sidebar-expanded .sidebar-toggle .icon-expand { display: none; }

.sidebar-brand .brand-icon { width: 26px; height: 26px; color: var(--c-primary); flex-shrink: 0; }

.sidebar-brand .brand-name {
    color: var(--c-text);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: .1px;
    line-height: 1.35;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    min-width: 0;
    opacity: 1;
    transition: opacity var(--tr-sidebar), max-width var(--tr-sidebar);
}

html.sidebar-expanded .sidebar-brand {
    flex-direction: row;
    height: 56px;
    padding: 0 12px;
    gap: 8px;
}
html.sidebar-collapsed .sidebar-brand {
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    padding: 12px 0 10px;
    min-height: 56px;
    height: auto;
}
html.sidebar-collapsed .sidebar-brand .brand-name {
    display: none;
}
html.sidebar-collapsed .sidebar-brand .brand-icon {
    width: 28px;
    height: 28px;
}

.sidebar-nav {
    flex: 1;
    overflow-x: hidden;
    overflow-y: auto;
    padding: 8px 0 12px;
}

.sidebar-nav .nav-group-title {
    padding: 12px 16px 4px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--c-text-sidebar-muted);
    white-space: nowrap;
    overflow: hidden;
    transition: opacity var(--tr-sidebar), padding var(--tr-sidebar), margin var(--tr-sidebar);
}

html.sidebar-collapsed .sidebar-nav .nav-group-title {
    display: none;
}

.sidebar-nav .nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 2px 8px;
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--c-text-sidebar);
    font-size: 13.5px;
    cursor: pointer;
    transition: background var(--tr), color var(--tr), padding var(--tr-sidebar), margin var(--tr-sidebar);
    border-left: none;
    white-space: nowrap;
    position: relative;
}

html.sidebar-collapsed .sidebar-nav .nav-item {
    justify-content: center;
    margin: 2px 10px;
    padding: 8px;
    gap: 0;
}

.sidebar-nav .nav-item .nav-label {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}
html.sidebar-collapsed .sidebar-nav .nav-item .nav-label {
    display: none;
}

.sidebar-nav .nav-item:hover {
    background: var(--c-sidebar-hover);
    color: var(--c-text);
}

.sidebar-nav .nav-item.active {
    background: var(--c-sidebar-active);
    color: var(--c-text-sidebar-active);
    font-weight: 600;
}

html.sidebar-collapsed .sidebar-nav .nav-item.active {
    background: var(--c-primary-light);
    color: var(--c-primary);
}

.sidebar-nav .nav-item.active .nav-icon {
    color: var(--c-primary);
}

.sidebar-nav .nav-item .nav-icon {
    width: 20px;
    height: 20px;
    text-align: center;
    font-size: 15px;
    flex-shrink: 0;
    color: var(--c-text-secondary);
    fill: none;
    stroke: currentColor;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.sidebar-nav .nav-item .nav-icon svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}
html.sidebar-collapsed .sidebar-nav .nav-item .nav-icon svg {
    width: 20px;
    height: 20px;
}

/* 可折叠菜单组 */
.nav-group-collapsible { margin-top: 4px; }
.nav-group-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: calc(100% - 16px);
    margin: 0 8px;
    padding: 8px 12px 4px;
    border: none;
    background: transparent;
    color: var(--c-text-sidebar-muted);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    cursor: pointer;
    text-align: left;
    border-radius: 6px;
}
.nav-group-toggle:hover { color: var(--c-text-secondary); background: var(--c-sidebar-hover); }
.nav-chevron {
    font-size: 10px;
    transition: transform var(--tr);
}
.nav-group-collapsible.open .nav-chevron { transform: rotate(180deg); }
.nav-sub {
    display: none;
    padding-bottom: 4px;
    margin-left: 12px;
    padding-left: 10px;
    border-left: 1px solid var(--c-border);
}
.nav-group-collapsible.open .nav-sub { display: block; }
.nav-sub-item {
    padding-left: 12px !important;
    font-size: 13px;
}

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--c-border);
    flex-shrink: 0;
    font-size: 12px;
    color: var(--c-text-secondary);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    transition: opacity var(--tr-sidebar), max-height var(--tr-sidebar);
}
html.sidebar-collapsed .sidebar-footer {
    display: none;
}

.sidebar-footer a { color: var(--c-text-secondary); }
.sidebar-footer a:hover { color: var(--c-primary); }

/* ---------- 主内容区 ---------- */
.main {
    margin-left: var(--sp-sidebar);
    min-height: 100vh;
    padding-top: 56px;
    transition: margin-left var(--tr-sidebar);
}

/* ---------- 顶栏 ---------- */
.topbar {
    position: fixed;
    top: 0;
    left: var(--sp-sidebar);
    right: 0;
    height: 56px;
    flex-shrink: 0;
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 50;
    transition: left var(--tr-sidebar);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topbar-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--c-text);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* 语言切换 */
.lang-switch {
    position: relative;
}
.lang-switch-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    background: var(--c-surface);
    color: var(--c-text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--tr);
}
.lang-switch-btn:hover { border-color: var(--c-primary-border); color: var(--c-primary); }
.lang-switch-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 140px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    box-shadow: var(--sh-lg);
    overflow: hidden;
    display: none;
    z-index: 60;
}
.lang-switch-dropdown.show { display: block; }
.lang-switch-dropdown .lang-item {
    padding: 8px 14px;
    font-size: 13px;
    color: var(--c-text-secondary);
    cursor: pointer;
    transition: all var(--tr);
}
.lang-switch-dropdown .lang-item:hover { background: var(--c-primary-light); color: var(--c-primary); }
.lang-switch-dropdown .lang-item.active { background: var(--c-primary-light); color: var(--c-primary); font-weight: 500; }

/* 用户菜单 */
.user-menu {
    position: relative;
}
.user-menu-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 10px 4px 4px;
    border-radius: var(--r-md);
    cursor: pointer;
    transition: background var(--tr);
}
.user-menu-btn:hover { background: var(--c-border-light); }
.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--c-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    flex-shrink: 0;
}
.user-name { font-size: 13px; color: var(--c-text); font-weight: 500; }
.user-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 160px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    box-shadow: var(--sh-lg);
    overflow: hidden;
    display: none;
    z-index: 60;
}
.user-dropdown.show { display: block; }
.user-dropdown .dropdown-item {
    padding: 9px 14px;
    font-size: 13px;
    color: var(--c-text-secondary);
    cursor: pointer;
    transition: all var(--tr);
    display: flex;
    align-items: center;
    gap: 8px;
}
.user-dropdown .dropdown-item:hover { background: var(--c-border-light); color: var(--c-text); }

/* ---------- 内容区 ---------- */
.content {
    flex: 1;
    padding: 24px;
}

.content-wrap {
    max-width: 1400px;
    margin: 0 auto;
}

.content-flush-top {
    padding-top: 0;
}

/* ---------- 导航汇总页（Hub） ---------- */
.hub-page { max-width: 960px; margin: 0 auto; }
.hub-intro {
    font-size: 13px;
    color: var(--c-text-secondary);
    line-height: 1.7;
    margin: 0 0 20px;
    padding: 12px 16px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
}
.hub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 14px;
}
.hub-card {
    display: block;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    padding: 20px 18px;
    text-decoration: none;
    color: inherit;
    transition: all .15s;
    box-shadow: var(--sh-sm);
}
.hub-card:hover {
    border-color: var(--c-primary-border);
    transform: translateY(-2px);
    box-shadow: var(--sh-md);
    color: inherit;
}
.hub-card-alarm { border-color: #fecaca; background: linear-gradient(135deg, #fff 0%, #fff5f5 100%); }
.hub-card-alarm:hover { border-color: #f87171; }
.hub-icon { font-size: 28px; line-height: 1; margin-bottom: 10px; }
.hub-title { font-size: 15px; font-weight: 600; color: var(--c-text); margin-bottom: 6px; }
.hub-desc { font-size: 12px; color: var(--c-text-secondary); line-height: 1.55; }

/* ---------- 页面内顶栏（录像/控制面板等） ---------- */
.page-head-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 0 14px;
    gap: 10px;
    flex-wrap: wrap;
}
.page-head-bar h3 {
    margin: 0;
    font-size: 15px;
    font-weight: 600;
    color: #2c3e50;
}
.page-head-bar .tools {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

/* ==========================================================================
   通用组件
   ========================================================================== */

/* ---------- 卡片 ---------- */
.card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    box-shadow: var(--sh-sm);
}

.card-body { padding: 20px; }
.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--c-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.card-title { font-size: 15px; font-weight: 600; color: var(--c-text); }

/* ---------- 页面头部 ---------- */
.page-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 12px;
}
.page-head-left { display: flex; align-items: center; gap: 12px; }
.page-head-title { font-size: 20px; font-weight: 600; color: var(--c-text); }
.page-head-sub { font-size: 13px; color: var(--c-text-tertiary); margin-top: 2px; }
.page-head-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 7px 16px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    background: var(--c-surface);
    color: var(--c-text-secondary);
    cursor: pointer;
    transition: all var(--tr);
    white-space: nowrap;
    line-height: 1.4;
}
.btn:hover { border-color: var(--c-text-tertiary); color: var(--c-text); }
.btn-primary {
    background: var(--c-primary);
    border-color: var(--c-primary);
    color: #fff;
}
.btn-primary:hover { background: var(--c-primary-hover); border-color: var(--c-primary-hover); color: #fff; }
.btn-danger {
    color: #b91c1c; border-color: #f5c6cb; background: #fff;
}
.btn-danger:hover { background: #b91c1c; border-color: #b91c1c; color: #fff; }
.btn-ghost { border-color: transparent; background: transparent; }
.btn-ghost:hover { background: var(--c-border-light); }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-lg { padding: 10px 24px; font-size: 14px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---------- 表单 ---------- */
.form-group { margin-bottom: 16px; }
.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--c-text);
    margin-bottom: 6px;
}
.form-label .required { color: var(--c-danger); margin-left: 2px; }
.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 8px 12px;
    font-size: 13px;
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    background: var(--c-surface);
    color: var(--c-text);
    transition: all var(--tr);
    outline: none;
    font-family: inherit;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.form-input::placeholder { color: var(--c-text-tertiary); }
.form-textarea { resize: vertical; min-height: 80px; }
.form-hint { font-size: 12px; color: var(--c-text-tertiary); margin-top: 4px; }
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }

/* 开关 */
.switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.switch-slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background: #cbd5e1;
    border-radius: 22px;
    transition: var(--tr);
}
.switch-slider::before {
    content: "";
    position: absolute;
    height: 16px; width: 16px;
    left: 3px; bottom: 3px;
    background: #fff;
    border-radius: 50%;
    transition: var(--tr);
}
.switch input:checked + .switch-slider { background: var(--c-primary); }
.switch input:checked + .switch-slider::before { transform: translateX(18px); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; }
table.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
table.data-table thead th {
    text-align: left;
    padding: 10px 14px;
    font-weight: 600;
    color: var(--c-text-secondary);
    background: var(--c-border-light);
    border-bottom: 1px solid var(--c-border);
    white-space: nowrap;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .3px;
}
table.data-table tbody td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--c-border-light);
    color: var(--c-text);
    vertical-align: middle;
}
table.data-table tbody tr:hover { background: var(--c-border-light); }
table.data-table tbody tr:last-child td { border-bottom: none; }

/* ---------- 徽章 ---------- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    font-size: 12px;
    font-weight: 500;
    border-radius: 20px;
    line-height: 1.5;
}
.badge-success { background: var(--c-success-bg); color: var(--c-success); }
.badge-warning { background: var(--c-warning-bg); color: var(--c-warning); }
.badge-danger { background: var(--c-danger-bg); color: var(--c-danger); }
.badge-info { background: var(--c-primary-light); color: var(--c-primary); }
.badge-neutral { background: var(--c-border-light); color: var(--c-text-secondary); }

/* 状态点 */
.status-dot {
    display: inline-block;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    margin-right: 5px;
}
.status-dot.online { background: var(--c-success); box-shadow: 0 0 0 2px var(--c-success-bg); }
.status-dot.offline { background: var(--c-text-tertiary); box-shadow: 0 0 0 2px var(--c-border-light); }

/* ---------- 搜索栏 ---------- */
.search-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.search-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}
.search-input-wrap .search-icon {
    position: absolute;
    left: 10px;
    color: var(--c-text-tertiary);
    font-size: 13px;
    pointer-events: none;
}
.search-input-wrap .form-input {
    padding-left: 32px;
    width: 220px;
}

/* ---------- 分页 ---------- */
.pagination {
    display: flex;
    align-items: center;
    gap: 4px;
    justify-content: center;
    margin-top: 16px;
}
.pagination .page-item {
    min-width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #d1d5db;
    border-radius: var(--r-sm);
    font-size: 13px;
    color: #6b7280;
    cursor: pointer;
    transition: all var(--tr);
    padding: 0 8px;
    background: #fff;
}
.pagination .page-item:hover { border-color: #9ca3af; color: #374151; background: #f9fafb; }
.pagination .page-item.active { background: #6b7280; border-color: #6b7280; color: #fff; }
.pagination .page-item.active:hover { background: #4b5563; border-color: #4b5563; }
.pagination .page-item.disabled { opacity: .4; cursor: not-allowed; }
.pagination .page-info { font-size: 13px; color: #9ca3af; margin: 0 8px; }

/* ---------- 弹窗 ---------- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,.45);
    z-index: 200;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding: 40px 20px;
    overflow-y: auto;
}
.modal-overlay.show { display: flex; }
.modal {
    background: var(--c-surface);
    border-radius: var(--r-lg);
    box-shadow: var(--sh-xl);
    width: 100%;
    max-width: 560px;
    margin: auto;
}
.modal.modal-lg { max-width: 760px; }
.modal.modal-xl { max-width: 960px; }
.modal-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--c-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-title { font-size: 16px; font-weight: 600; color: var(--c-text); }
.modal-close {
    width: 28px; height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--r-sm);
    color: var(--c-text-tertiary);
    cursor: pointer;
    transition: all var(--tr);
    font-size: 18px;
    background: none;
    border: none;
}
.modal-close:hover { background: var(--c-border-light); color: var(--c-text); }
.modal-body { padding: 24px; max-height: calc(100vh - 200px); overflow-y: auto; }
.modal-footer {
    padding: 14px 24px;
    border-top: 1px solid var(--c-border-light);
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* ---------- 折叠区域 ---------- */
.collapse-section {
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    margin-bottom: 12px;
    overflow: hidden;
}
.collapse-header {
    padding: 10px 14px;
    background: var(--c-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    color: var(--c-text);
    user-select: none;
}
.collapse-header .collapse-arrow { transition: transform var(--tr); color: var(--c-text-tertiary); }
.collapse-header.expanded .collapse-arrow { transform: rotate(90deg); }
.collapse-body { padding: 14px; display: none; }
.collapse-body.show { display: block; }

/* ---------- 统计卡片 ---------- */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.stat-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    padding: 20px;
    box-shadow: var(--sh-sm);
    transition: box-shadow var(--tr);
}
.stat-card:hover { box-shadow: var(--sh-md); }
.stat-card .stat-icon {
    width: 40px; height: 40px;
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    margin-bottom: 12px;
}
.stat-card .stat-icon.blue { background: var(--c-primary-light); color: var(--c-primary); }
.stat-card .stat-icon.green { background: var(--c-success-bg); color: var(--c-success); }
.stat-card .stat-icon.amber { background: var(--c-warning-bg); color: var(--c-warning); }
.stat-card .stat-icon.slate { background: var(--c-border-light); color: var(--c-text-secondary); }
.stat-card .stat-label { font-size: 13px; color: var(--c-text-secondary); margin-bottom: 4px; }
.stat-card .stat-value { font-size: 26px; font-weight: 700; color: var(--c-text); line-height: 1.2; }
.stat-card .stat-unit { font-size: 14px; font-weight: 400; color: var(--c-text-tertiary); margin-left: 4px; }

/* ---------- 系统信息条 ---------- */
.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--c-border-light);
    font-size: 13px;
}
.info-row:last-child { border-bottom: none; }
.info-row .info-label { color: var(--c-text-secondary); }
.info-row .info-value { color: var(--c-text); font-weight: 500; }

/* ---------- 进度条 ---------- */
.progress {
    height: 6px;
    background: var(--c-border-light);
    border-radius: 3px;
    overflow: hidden;
}
.progress-bar {
    height: 100%;
    border-radius: 3px;
    transition: width .4s ease;
}
.progress-bar.blue { background: var(--c-primary); }
.progress-bar.green { background: var(--c-success); }
.progress-bar.amber { background: var(--c-warning); }
.progress-bar.red { background: var(--c-danger); }

/* ---------- 空状态 ---------- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--c-text-tertiary);
}
.empty-state .empty-icon { font-size: 40px; margin-bottom: 12px; opacity: .5; }
.empty-state .empty-text { font-size: 14px; }

/* ---------- Toast 提示 ---------- */
.toast-container {
    position: fixed;
    top: 70px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}
.toast { pointer-events: auto; }
.toast {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    padding: 12px 16px;
    box-shadow: var(--sh-lg);
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 260px;
    max-width: 400px;
    animation: toastIn .25s ease;
    border-left: 3px solid var(--c-primary);
}
.toast.success { border-left-color: var(--c-success); }
.toast.error { border-left-color: var(--c-danger); }
.toast.warning { border-left-color: var(--c-warning); }
.toast .toast-icon { font-size: 16px; flex-shrink: 0; }
.toast.success .toast-icon { color: var(--c-success); }
.toast.error .toast-icon { color: var(--c-danger); }
.toast.warning .toast-icon { color: var(--c-warning); }
.toast .toast-msg { flex: 1; color: var(--c-text); }
@keyframes toastIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }

/* ---------- 标签页 ---------- */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--c-border-light);
    margin-bottom: 20px;
}
.tab-item {
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--c-text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all var(--tr);
}
.tab-item:hover { color: var(--c-text); }
.tab-item.active { color: var(--c-primary); border-bottom-color: var(--c-primary); }
.tab-pane { display: none; }
.tab-pane.show { display: block; }

/* ---------- 摄像头卡片网格 ---------- */
.camera-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}
.camera-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    overflow: hidden;
    box-shadow: var(--sh-sm);
    transition: all var(--tr);
}
.camera-card:hover { box-shadow: var(--sh-md); border-color: var(--c-primary-border); }
.camera-card .camera-thumb {
    height: 160px;
    background: #1e293b;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #475569;
    font-size: 36px;
}
.camera-card .camera-thumb.online { background: #0f172a; }
.camera-card .camera-thumb .thumb-status {
    position: absolute;
    top: 8px; right: 8px;
}
.camera-card .camera-body { padding: 14px; }
.camera-card .camera-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--c-text);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.camera-card .camera-meta {
    font-size: 12px;
    color: var(--c-text-tertiary);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.camera-card .camera-actions {
    padding: 10px 14px;
    border-top: 1px solid var(--c-border-light);
    display: flex;
    gap: 6px;
    justify-content: flex-end;
}

/* ---------- 播放器区域 ---------- */
.player-wrap {
    background: #000;
    border-radius: var(--r-lg);
    overflow: hidden;
    position: relative;
    aspect-ratio: 16/9;
}
.player-wrap video, .player-wrap canvas {
    width: 100%;
    height: 100%;
    display: block;
}
.player-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #64748b;
    font-size: 14px;
    flex-direction: column;
    gap: 8px;
}
.player-info-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 12px;
}

/* ---------- 协议地址列表 ---------- */
.url-list .url-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    margin-bottom: 6px;
    font-size: 12px;
    background: var(--c-surface);
}
.url-list .url-item .url-label {
    font-weight: 600;
    color: var(--c-text-secondary);
    min-width: 70px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: .3px;
}
.url-list .url-item .url-value {
    flex: 1;
    color: var(--c-text);
    font-family: "SF Mono", "Consolas", monospace;
    font-size: 12px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin: 0 10px;
}
.url-list .url-item .url-copy {
    color: var(--c-text-tertiary);
    cursor: pointer;
    transition: color var(--tr);
    font-size: 12px;
    flex-shrink: 0;
}
.url-list .url-item .url-copy:hover { color: var(--c-primary); }

/* ---------- PTZ 控制盘 ---------- */
.ptz-pad {
    display: grid;
    grid-template-columns: repeat(3, 44px);
    grid-template-rows: repeat(3, 44px);
    gap: 4px;
    margin: 0 auto;
    width: fit-content;
}
.ptz-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    background: var(--c-surface);
    color: var(--c-text-secondary);
    cursor: pointer;
    transition: all var(--tr);
    font-size: 16px;
}
.ptz-btn:hover { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.ptz-btn.ptz-center { background: var(--c-border-light); }
.ptz-btn:active { transform: scale(.95); }

/* ---------- 移动端汉堡按钮（默认隐藏，手机端显示） ---------- */
.sidebar-mobile-toggle {
    display: none;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    background: var(--c-surface);
    color: var(--c-text-secondary);
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
}
.sidebar-mobile-toggle:hover { background: var(--c-sidebar-hover); color: var(--c-text); }
.sidebar-mobile-toggle svg { width: 20px; height: 20px; display: block; }

/* ---------- 移动端遮罩层 ---------- */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 998;
    opacity: 0;
    transition: opacity var(--tr);
}
.sidebar-overlay.show {
    display: block;
    opacity: 1;
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    /* 显示汉堡按钮 */
    .sidebar-mobile-toggle { display: flex; }

    /* 侧边栏改为抽屉式覆盖显示 */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        z-index: 999;
        width: var(--sp-sidebar-full);
        transform: translateX(-100%);
        transition: transform var(--tr);
        box-shadow: 2px 0 16px rgba(0, 0, 0, 0.12);
    }
    .sidebar.show { transform: translateX(0); }

    /* 手机端无论 sidebar-collapsed / sidebar-expanded 都显示完整文字标签 */
    html.sidebar-collapsed .sidebar { width: var(--sp-sidebar-full); }
    html.sidebar-collapsed .sidebar-brand {
        flex-direction: row;
        height: 56px;
        padding: 0 12px;
        gap: 8px;
    }
    html.sidebar-collapsed .sidebar-brand .brand-name { display: inline; opacity: 1; }
    html.sidebar-collapsed .sidebar-nav .nav-group-title { display: block; opacity: 1; }
    html.sidebar-collapsed .sidebar-nav .nav-item {
        justify-content: flex-start;
        margin: 2px 8px;
        padding: 8px 12px;
        gap: 10px;
    }
    html.sidebar-collapsed .sidebar-nav .nav-item .nav-label { display: inline; }
    html.sidebar-collapsed .sidebar-nav .nav-item .nav-icon svg { width: 18px; height: 18px; }
    html.sidebar-collapsed .sidebar-nav .nav-item.active {
        background: var(--c-sidebar-active);
        color: var(--c-text-sidebar-active);
    }
    html.sidebar-collapsed .sidebar-footer { opacity: 1; max-height: 60px; }

    .main { margin-left: 0; }
    .topbar { left: 0; }
    .content { padding: 16px; }
    .form-row { flex-direction: column; }
    .stat-grid { grid-template-columns: 1fr 1fr; }
    .camera-grid { grid-template-columns: 1fr; }
    .topbar-title { font-size: 15px; }
}

/* ---------- 工具类 ---------- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--c-text-tertiary); }
.text-primary { color: var(--c-primary); }
.text-success { color: var(--c-success); }
.text-danger { color: var(--c-danger); }
.fw-600 { font-weight: 600; }
.mt-0 { margin-top: 0; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-0 { margin-bottom: 0; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.flex { display: flex; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.flex-wrap { flex-wrap: wrap; }
.hidden { display: none; }
.w-full { width: 100%; }
.mono { font-family: "SF Mono", "Consolas", monospace; }