/* =========================================================
 * CodeShare 大厂级科技蓝设计系统（三主题：Azure / Lark / Nova）
 * 严格遵循去 AI 味规范：扁平、克制、信息密度对标飞书/Notion/Linear
 * 通过 <html data-theme="azure|lark|nova"> 切换主题
 * 默认主题：Azure（微软 Fluent 风）
 * ========================================================= */

/* ---------- 默认 Azure 主题（微软 Fluent 风） ---------- */
:root,
:root[data-theme="azure"] {
    --brand: #0F6CBD;
    --brand-hover: #0B5CA6;
    --brand-soft: #E8F1FA;
    --brand-2: #0F6CBD;

    --bg: #F5F6F7;
    --card: #FFFFFF;
    --border: #E0E3E8;

    --text: #1F2733;
    --text-2: #5F6B7A;
    --text-3: #9AA3AF;

    --nav-bg: #FFFFFF;
    --nav-text: #3A4657;
    --nav-soft: #E8F1FA;
    --nav-active-text: var(--brand);
    --text-on-nav: #3A4657;

    --radius: 6px;
    --radius-lg: 8px;
    --shadow: 0 1px 2px rgba(16, 32, 48, .06);
    --shadow-card: 0 1px 2px rgba(16, 32, 48, .06);

    --success: #16A34A;
    --warning: #D97706;
    --danger: #DC2626;
    --info: var(--brand);

    --font-stack: "Segoe UI", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;

    /* 兼容旧变量名（base.css/style.css 中使用） */
    --primary-color: var(--brand);
    --primary-hover: var(--brand-hover);
    --secondary-color: var(--brand-2);
    --warning-color: var(--warning);
    --danger-color: var(--danger);
    --info-color: var(--brand);
    --success-color: var(--success);
    --text-color: var(--text);
    --text-light: var(--text-2);
    --bg-color: var(--bg);
    --bg-dark: var(--nav-bg);
    --border-color: var(--border);
    --login-primary: var(--brand);
    --login-primary-hover: var(--brand-hover);
    --login-primary-light: var(--brand-soft);
    --login-text: var(--text);
    --login-text-secondary: var(--text-2);
    --login-text-muted: var(--text-3);
    --login-border: var(--border);
    --login-border-focus: var(--brand);
    --login-bg: var(--bg);
    --login-white: var(--card);
    --login-error: var(--danger);

    /* ===== 子系统变量别名（dazi / student-mgmt / modals-v2 等）===== */
    --primary: var(--brand);
    --primary-dark: var(--brand-hover);
    --primary-hover: var(--brand-hover);
    --primary-light: var(--brand-soft);
    --primary-bg: var(--brand-soft);
    --primary-gradient: var(--brand);
    --bg-card: var(--card);
    --bg-light: var(--bg);
    --text-light: var(--text-2);
    --text-lighter: var(--text-3);
    --m2-primary: var(--brand);
    --m2-primary-dark: var(--brand-hover);
    --m2-bg: var(--card);
    --m2-bg-secondary: var(--bg);
    --m2-border: var(--border);
    --m2-text: var(--text);
    --m2-text-secondary: var(--text-2);
    --m2-text-light: var(--text-3);
    --m2-shadow: var(--shadow-card);
    --m2-radius: var(--radius);
    --m2-radius-sm: var(--radius);
    --m2-radius-lg: var(--radius-lg);
}

/* ---------- Lark 蓝（飞书风） ---------- */
:root[data-theme="lark"] {
    --brand: #3370FF;
    --brand-hover: #2B5FE8;
    --brand-soft: #EDF2FF;
    --brand-2: #588AFF;

    --bg: #F5F6F7;
    --card: #FFFFFF;
    --border: #E8EAED;

    --text: #1F2329;
    --text-2: #646A73;
    --text-3: #A8ABB3;

    --nav-bg: #FFFFFF;
    --nav-text: #1F2329;
    --nav-soft: #EDF2FF;
    --nav-active-text: var(--brand);
    --text-on-nav: #1F2329;

    --radius: 8px;
    --radius-lg: 10px;
    --shadow: 0 2px 8px rgba(31, 35, 41, .06);
    --shadow-card: 0 2px 8px rgba(31, 35, 41, .06);

    --font-stack: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}

/* ---------- Nova 深空蓝（深色侧边栏，专业感） ---------- */
:root[data-theme="nova"] {
    --brand: #2E6BE6;
    --brand-hover: #2459C9;
    --brand-soft: #E9F0FE;
    --brand-2: #3B7BFF;

    --bg: #F4F6FA;
    --card: #FFFFFF;
    --border: #E3E8F0;

    --text: #1B2537;
    --text-2: #5A6B85;
    --text-3: #93A1BB;

    --nav-bg: #0C1B33;
    --nav-text: #8FA3C4;
    --nav-soft: rgba(46, 107, 230, .18);
    --nav-active-text: #FFFFFF;
    --text-on-nav: #FFFFFF;

    --radius: 6px;
    --radius-lg: 8px;
    --shadow: 0 1px 3px rgba(12, 27, 51, .08);
    --shadow-card: 0 1px 3px rgba(12, 27, 51, .08);
}

/* =========================================================
 * 全局基础重置
 * 注意：body.cs-raw-theme 为全屏应用/游戏页豁免（Scratch 编辑器、
 * 监控大屏、太空打字游戏等自带深色场景），不强制浅底深字。
 * ========================================================= */
html {
    background: var(--bg);
}
body:not(.cs-raw-theme) {
    background: var(--bg) !important;
    color: var(--text) !important;
    /* v3 护眼排版：基准字号 15px，行高 1.65，降低长时间阅读疲劳 */
    font-size: 15px !important;
    line-height: 1.65 !important;
}
html, body {
    font-family: var(--font-stack) !important;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 链接主色 */
a { color: var(--brand); }
a:hover { color: var(--brand-hover); }

/* =========================================================
 * 卡片统一规范：白底 + 1px 细边框 + 6-8px 圆角 + 极淡投影
 * ========================================================= */
.admin-container,
.admin-header,
.admin-sidebar,
.admin-content > div,
.card,
.course-card,
.problem-card,
.modal,
.modal-content,
.login-wrapper,
.classroom-monitor-container,
.student-mgmt-container,
.course-manage-container,
.campus-card,
.class-card,
.user-card,
.question-card,
.tab-content,
.tab-pane,
.data-panel,
.stats-card,
.info-card,
.profile-card,
.achievement-card,
.quiz-mode-card,
.exam-card,
.contest-card,
.training-card,
.homework-card {
    background: var(--card) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--radius) !important;
    box-shadow: var(--shadow-card) !important;
}

/* 大圆角降级到 6-8px */
.admin-header,
.admin-sidebar,
.login-wrapper,
.modal-content,
.course-card {
    border-radius: var(--radius-lg) !important;
}

/* =========================================================
 * 顶部导航/页面头：取消紫蓝渐变，统一品牌色或浅色
 * ========================================================= */
.page-header,
.admin-header,
.classroom-monitor-header,
.student-mgmt-header,
.course-manage-header,
.tab-header,
.problem-header,
.exam-header,
.contest-header,
.training-header,
.homework-header {
    background: var(--nav-bg) !important;
    color: var(--text) !important;
    box-shadow: var(--shadow-card) !important;
    border-bottom: 1px solid var(--border) !important;
}

/* 页面标题字色 */
.page-header h1,
.page-header h2,
.admin-header h1,
.admin-header h2,
.classroom-monitor-header h1,
.classroom-monitor-header h2,
.student-mgmt-header h1,
.student-mgmt-header h2,
.course-manage-header h1,
.course-manage-header h2 {
    color: var(--text) !important;
    font-weight: 600 !important;
}

/* Nova 主题：顶栏与侧边栏深色 */
:root[data-theme="nova"] .page-header,
:root[data-theme="nova"] .admin-header,
:root[data-theme="nova"] .classroom-monitor-header,
:root[data-theme="nova"] .student-mgmt-header,
:root[data-theme="nova"] .course-manage-header,
:root[data-theme="nova"] .admin-sidebar,
:root[data-theme="nova"] .sidebar-menu {
    background: var(--nav-bg) !important;
    color: #FFFFFF !important;
}

:root[data-theme="nova"] .page-header h1,
:root[data-theme="nova"] .page-header h2,
:root[data-theme="nova"] .admin-header h1,
:root[data-theme="nova"] .admin-header h2,
:root[data-theme="nova"] .admin-header .user-info,
:root[data-theme="nova"] .admin-header .user-info span,
:root[data-theme="nova"] .sidebar-info,
:root[data-theme="nova"] .sidebar-info div,
:root[data-theme="nova"] .sidebar-info span,
:root[data-theme="nova"] .sidebar-menu li {
    color: var(--nav-text) !important;
}

:root[data-theme="nova"] .admin-header .user-info .btn,
:root[data-theme="nova"] .page-header .btn,
:root[data-theme="nova"] .admin-header .role-badge {
    color: #FFFFFF !important;
}

/* =========================================================
 * 侧边栏导航：激活项浅蓝底 + 蓝字 + 6px 圆角
 * ========================================================= */
.sidebar-menu li,
.nav-item,
.menu-item {
    color: var(--nav-text) !important;
    border-radius: var(--radius) !important;
    transition: background-color .15s ease, color .15s ease !important;
}

.sidebar-menu li:hover,
.nav-item:hover,
.menu-item:hover {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}

.sidebar-menu li.active,
.nav-item.active,
.menu-item.active,
.sidebar-menu li.active > span {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
    font-weight: 600 !important;
    border-radius: var(--radius) !important;
    margin-right: 0 !important;
    background-image: none !important;
}

/* Nova 深色侧边栏：激活项白字 + 半透明蓝底 */
:root[data-theme="nova"] .sidebar-menu li.active,
:root[data-theme="nova"] .nav-item.active,
:root[data-theme="nova"] .menu-item.active,
:root[data-theme="nova"] .sidebar-menu li.active > span {
    background: var(--nav-soft) !important;
    color: #FFFFFF !important;
}

:root[data-theme="nova"] .sidebar-menu li:hover,
:root[data-theme="nova"] .nav-item:hover,
:root[data-theme="nova"] .menu-item:hover {
    background: rgba(255, 255, 255, .06) !important;
    color: #FFFFFF !important;
}

/* =========================================================
 * 按钮：主按钮实心品牌蓝 / 次按钮白底蓝字
 * ========================================================= */
.btn,
.btn-login,
.nav-btn,
.btn-primary,
.btn-secondary,
.btn-info,
button {
    border-radius: var(--radius) !important;
    font-weight: 500 !important;
    transition: background-color .15s ease, border-color .15s ease, color .15s ease !important;
    box-shadow: none !important;
}

/* 主按钮：实心品牌蓝、白字 */
.btn-primary,
.btn-login,
.nav-btn-primary,
.btn.btn-primary,
button.btn-primary,
input[type="submit"].btn-primary {
    background: var(--brand) !important;
    color: #FFFFFF !important;
    border: 1px solid var(--brand) !important;
    background-image: none !important;
}

.btn-primary:hover,
.btn-login:hover:not(:disabled),
.nav-btn-primary:hover {
    background: var(--brand-hover) !important;
    border-color: var(--brand-hover) !important;
    color: #FFFFFF !important;
    transform: none !important;
    box-shadow: none !important;
}

/* 次按钮：白底 + 浅灰边框，hover 文字变蓝 */
.btn-secondary,
.nav-btn-secondary,
.btn-info,
.nav-btn-info,
.btn-success,
.nav-btn-success,
.btn-warning,
.nav-btn-warning,
.btn-danger,
.nav-btn-danger,
.btn.btn-secondary,
.btn.btn-info,
.btn.btn-success,
.btn.btn-warning,
.btn.btn-danger {
    background: var(--card) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    background-image: none !important;
}

.btn-secondary:hover,
.nav-btn-secondary:hover,
.btn-info:hover,
.nav-btn-info:hover,
.btn-success:hover,
.nav-btn-success:hover,
.btn-warning:hover,
.nav-btn-warning:hover,
.btn-danger:hover,
.nav-btn-danger:hover {
    color: var(--brand) !important;
    border-color: var(--brand) !important;
    background: var(--brand-soft) !important;
    transform: none !important;
    box-shadow: none !important;
}

/* 仅保留 danger 按钮的红色提示 */
.btn-danger,
.nav-btn-danger {
    color: var(--danger) !important;
    border-color: rgba(220, 38, 38, .4) !important;
    background: var(--card) !important;
}

.btn-danger:hover,
.nav-btn-danger:hover {
    background: rgba(220, 38, 38, .08) !important;
    color: var(--danger) !important;
    border-color: var(--danger) !important;
}

/* 仅保留 success 按钮的绿色提示 */
.btn-success,
.nav-btn-success {
    color: var(--success) !important;
    border-color: rgba(22, 163, 74, .4) !important;
}

.btn-success:hover,
.nav-btn-success:hover {
    background: rgba(22, 163, 74, .08) !important;
    color: var(--success) !important;
    border-color: var(--success) !important;
}

/* 仅保留 warning 按钮的橙色提示 */
.btn-warning,
.nav-btn-warning {
    color: var(--warning) !important;
    border-color: rgba(217, 119, 6, .4) !important;
}

.btn-warning:hover,
.nav-btn-warning:hover {
    background: rgba(217, 119, 6, .08) !important;
    color: var(--warning) !important;
    border-color: var(--warning) !important;
}

/* =========================================================
 * 输入框：聚焦时品牌蓝边框 + 1px ring
 * ========================================================= */
input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
input[type="search"],
input[type="url"],
input[type="tel"],
textarea,
select {
    border: 1px solid var(--border) !important;
    border-radius: var(--radius) !important;
    background: var(--card) !important;
    color: var(--text) !important;
    font-family: var(--font-stack) !important;
    transition: border-color .15s ease, box-shadow .15s ease !important;
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus,
input[type="number"]:focus,
input[type="search"]:focus,
input[type="url"]:focus,
input[type="tel"]:focus,
textarea:focus,
select:focus {
    outline: none !important;
    border-color: var(--brand) !important;
    box-shadow: 0 0 0 1px var(--brand), 0 0 0 3px rgba(15, 108, 189, .12) !important;
}

/* =========================================================
 * 登录页：替换紫蓝渐变
 * ========================================================= */
.login-page {
    background: var(--bg) !important;
    background-image: none !important;
}

.login-background {
    opacity: .35 !important;
}

.login-wrapper {
    border-radius: var(--radius-lg) !important;
    box-shadow: 0 8px 32px rgba(16, 32, 48, .10) !important;
}

/* 顶部装饰条改为品牌色 */
.login-wrapper::before {
    background: var(--brand) !important;
    background-image: none !important;
}

.login-panel-header h2 {
    color: var(--text) !important;
}

.login-panel-header p,
.login-panel-footer p {
    color: var(--text-2) !important;
}

.login-form input {
    border: 1px solid var(--border) !important;
    border-radius: var(--radius) !important;
    background: var(--card) !important;
    color: var(--text) !important;
}

.login-form input:focus {
    border-color: var(--brand) !important;
    box-shadow: 0 0 0 1px var(--brand), 0 0 0 3px rgba(15, 108, 189, .12) !important;
}

/* 登录按钮：扁平品牌蓝 */
.btn-login {
    background: var(--brand) !important;
    background-image: none !important;
    border: none !important;
    color: #FFFFFF !important;
    border-radius: var(--radius) !important;
    font-weight: 600 !important;
    box-shadow: none !important;
}

.btn-login:hover:not(:disabled) {
    background: var(--brand-hover) !important;
    transform: none !important;
    box-shadow: none !important;
}

/* =========================================================
 * 表格：表头浅灰小字、行分隔线、无斑马纹
 * ========================================================= */
table,
.table {
    background: var(--card) !important;
    border-collapse: collapse !important;
    border-radius: var(--radius) !important;
    overflow: hidden;
}

table thead th,
table thead td,
.table thead th {
    background: var(--bg) !important;
    color: var(--text-3) !important;
    font-weight: 500 !important;
    font-size: 13px !important;
    text-transform: none !important;
    border-bottom: 1px solid var(--border) !important;
}

table tbody tr,
.table tbody tr {
    border-bottom: 1px solid var(--border) !important;
    background: var(--card) !important;
}

table tbody tr:hover,
.table tbody tr:hover {
    background: var(--brand-soft) !important;
}

/* =========================================================
 * 徽章/标签：圆角胶囊、浅底深字
 * ========================================================= */
.badge,
.role-badge,
.campus-badge,
.tag,
.label,
.chip,
.pill {
    border-radius: 999px !important;
    font-size: 12px !important;
    font-weight: 500 !important;
    padding: 2px 10px !important;
    background-image: none !important;
}

.role-badge {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}

.campus-badge {
    background: rgba(22, 163, 74, .1) !important;
    color: var(--success) !important;
}

/* =========================================================
 * 模态框：白底 + 6-8px 圆角 + 极淡投影
 * ========================================================= */
.modal,
.modal-content,
.dialog,
.popup {
    background: var(--card) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--radius-lg) !important;
    box-shadow: 0 8px 32px rgba(16, 32, 48, .12) !important;
}

.modal-header,
.dialog-header,
.popup-header {
    border-bottom: 1px solid var(--border) !important;
    color: var(--text) !important;
}

/* =========================================================
 * 选项卡 / Tabs
 * ========================================================= */
.tab,
.tab-btn,
.nav-tab {
    color: var(--text-2) !important;
    border-radius: var(--radius) !important;
    transition: background-color .15s ease, color .15s ease !important;
}

.tab.active,
.tab-btn.active,
.nav-tab.active {
    color: var(--brand) !important;
    background: var(--brand-soft) !important;
    font-weight: 600 !important;
}

/* =========================================================
 * 渐变背景全局清除（去 AI 味）
 * ========================================================= */
[style*="linear-gradient(135deg, #667eea"],
[style*="linear-gradient(135deg,#667eea"],
[style*="linear-gradient(135deg, #1e3a5f"],
[style*="linear-gradient(135deg, #5d4037"],
[style*="linear-gradient(135deg, #1e3a5f 0%, #2563eb"],
[style*="linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb"] {
    background: var(--brand) !important;
    background-image: none !important;
    color: #FFFFFF !important;
}

/* CSS 文件中的渐变类（用类选择器逐一覆盖太繁琐，统一用属性选择器降级） */
.admin-header[style*="gradient"],
.sidebar-menu li.active[style*="gradient"],
.btn-login[style*="gradient"],
.role-badge[style*="gradient"] {
    background: var(--brand) !important;
    background-image: none !important;
}

/* =========================================================
 * 数字看板：大号粗体数字 + 小标签
 * ========================================================= */
.stat-number,
.stat-value,
.metric-value,
.kpi-number,
.dashboard-number {
    font-size: 28px !important;
    font-weight: 700 !important;
    color: var(--text) !important;
    font-variant-numeric: tabular-nums;
}

.stat-label,
.metric-label,
.kpi-label {
    font-size: 13px !important;
    color: var(--text-3) !important;
    font-weight: 500 !important;
}

/* =========================================================
 * 空状态/加载：居中灰字
 * ========================================================= */
.empty-state,
.empty,
.no-data,
.loading,
.loading-text {
    color: var(--text-3) !important;
    text-align: center !important;
}

/* =========================================================
 * 分页器
 * ========================================================= */
.pagination button,
.pagination .page-btn,
.pager button,
.pager .page-btn {
    border: 1px solid var(--border) !important;
    background: var(--card) !important;
    color: var(--text-2) !important;
    border-radius: var(--radius) !important;
}

.pagination button.active,
.pagination .page-btn.active,
.pagination button:hover,
.pagination .page-btn:hover,
.pager button.active,
.pager .page-btn:hover {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
    border-color: var(--brand) !important;
}

/* =========================================================
 * 主题切换器组件样式（login.html 登录按钮下方）
 * ========================================================= */
.cs-theme-switcher {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}

.cs-theme-switcher-label {
    font-size: 12px;
    color: var(--text-3);
    margin-right: 4px;
    font-weight: 500;
    white-space: nowrap;
}

.cs-theme-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text-2);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all .15s ease;
    font-family: inherit;
    line-height: 1.4;
}

.cs-theme-btn:hover {
    border-color: var(--brand);
    color: var(--brand);
    background: var(--brand-soft);
}

.cs-theme-btn.active {
    background: var(--brand);
    color: #FFFFFF;
    border-color: var(--brand);
    box-shadow: 0 2px 6px rgba(15, 108, 189, .2);
}

.cs-theme-btn .cs-theme-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
    border: 1px solid rgba(0, 0, 0, .08);
}

.cs-theme-btn[data-theme="azure"] .cs-theme-dot { background: #0F6CBD; }
.cs-theme-btn[data-theme="lark"]  .cs-theme-dot { background: #3370FF; }
.cs-theme-btn[data-theme="nova"]  .cs-theme-dot { background: #2E6BE6; }

.cs-theme-btn.active .cs-theme-dot {
    border-color: rgba(255, 255, 255, .4);
}

/* =========================================================
 * 移动端响应式：手机单列、平板两列
 * ========================================================= */
@media (max-width: 768px) {
    .cs-theme-switcher {
        gap: 6px;
    }
    .cs-theme-btn {
        padding: 5px 10px;
        font-size: 11px;
    }
    .cs-theme-switcher-label {
        display: none;
    }
}

/* =========================================================
 * 滚动条统一（极简灰）
 * ========================================================= */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-3);
}

/* =========================================================
 * 焦点可见性（无障碍）
 * ========================================================= */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
    outline: 2px solid var(--brand);
    outline-offset: 2px;
}

/* =========================================================
 * 字体平滑（macOS）
 * ========================================================= */
body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

/* ###################################################################
 * # 以下为第二批统一覆盖（v2）：导航按钮 / 弹窗 / 看板 / 子系统页面
 * ################################################################### */

/* =========================================================
 * 学生端 / 教师端 顶部导航（v3 专家重设计）
 * 导航栏改为实心品牌蓝底（Azure/Lark），层级清晰、突出显示；
 * Nova 主题保持深空蓝侧顶栏。按钮统一 14px / 高 34px，
 * 主操作白底蓝字，次操作半透明白描边，消除字号不一。
 * ========================================================= */
.page-header .user-name,
.page-header .class-name {
    background: rgba(255, 255, 255, .16) !important;
    color: #FFFFFF !important;
    font-size: 13px !important;
    font-weight: 500 !important;
    padding: 3px 12px !important;
    border-radius: var(--radius) !important;
}

/* 校区名称：与“教师端/学生端”标题同等大小字重（HTML 内联样式已移除） */
.page-header .user-campus {
    color: rgba(255, 255, 255, .9) !important;
    font-size: 18px !important;
    font-weight: 600 !important;
    opacity: 1 !important;
    margin-left: 8px !important;
    white-space: nowrap !important;
}

/* 学生端/教师端顶栏：品牌蓝实心底（Azure/Lark/默认） */
.student-page .page-header,
.teacher-page .page-header {
    background: var(--brand) !important;
    background-image: none !important;
    color: #FFFFFF !important;
    border-bottom: none !important;
    box-shadow: 0 2px 10px rgba(15, 108, 189, .28) !important;
}
.student-page .page-header h2,
.teacher-page .page-header h2 {
    color: #FFFFFF !important;
    font-size: 18px !important;
    font-weight: 600 !important;
    letter-spacing: .3px !important;
}
.student-page .page-header .status-text,
.teacher-page .page-header .status-text,
.student-page .page-header .sync-status,
.teacher-page .page-header .sync-status,
.student-page .page-header .class-selector label,
.teacher-page .page-header .class-selector label {
    color: rgba(255, 255, 255, .9) !important;
}
.student-page .page-header .coin-amount,
.teacher-page .page-header .coin-amount { color: #FFFFFF !important; }

/* Nova 主题：保留深空蓝顶栏，不使用品牌蓝 */
:root[data-theme="nova"] .student-page .page-header,
:root[data-theme="nova"] .teacher-page .page-header {
    background: var(--nav-bg) !important;
    box-shadow: var(--shadow-card) !important;
}

.student-page .nav-group,
.teacher-page .nav-group {
    background: transparent !important;
    padding: 0 !important;
    gap: 6px !important;
}

/* 学生端/教师端（蓝底顶栏）按钮：半透明白幽灵样式 */
.student-page .nav-btn,
.teacher-page .nav-btn {
    font-size: 14px !important;
    font-weight: 500 !important;
    line-height: 1.4 !important;
    height: 34px !important;
    min-height: 34px !important;
    padding: 0 14px !important;
    min-width: auto !important;
    border-radius: var(--radius) !important;
    border: 1px solid rgba(255, 255, 255, .35) !important;
    background: rgba(255, 255, 255, .12) !important;
    color: #FFFFFF !important;
    box-shadow: none !important;
    transform: none !important;
    transition: background-color .15s ease, border-color .15s ease, color .15s ease !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
}

.student-page .nav-btn:hover,
.teacher-page .nav-btn:hover {
    opacity: 1 !important;
    transform: none !important;
    box-shadow: none !important;
    border-color: rgba(255, 255, 255, .75) !important;
    color: #FFFFFF !important;
    background: rgba(255, 255, 255, .24) !important;
}

/* 其他浅色顶栏页面（题库/竞赛/训练等）：白底深字按钮，统一 14px / 34px */
.page-header .nav-btn {
    font-size: 14px !important;
    font-weight: 500 !important;
    line-height: 1.4 !important;
    height: 34px !important;
    min-height: 34px !important;
    padding: 0 14px !important;
    border-radius: var(--radius) !important;
    border: 1px solid var(--border) !important;
    background: var(--card) !important;
    color: var(--text) !important;
    box-shadow: none !important;
}
.page-header .nav-btn:hover {
    border-color: var(--brand) !important;
    color: var(--brand) !important;
    background: var(--brand-soft) !important;
}
.page-header .nav-btn-primary {
    background: var(--brand) !important;
    border-color: var(--brand) !important;
    color: #FFFFFF !important;
}
.page-header .nav-btn-primary:hover {
    background: var(--brand-hover) !important;
    border-color: var(--brand-hover) !important;
    color: #FFFFFF !important;
}

/* 主操作：白底蓝字（蓝底上的最高优先级，仅学生/教师端） */
.student-page .nav-btn-primary,
.teacher-page .nav-btn-primary {
    background: #FFFFFF !important;
    border-color: #FFFFFF !important;
    color: var(--brand) !important;
    font-weight: 600 !important;
}
.student-page .nav-btn-primary:hover,
.teacher-page .nav-btn-primary:hover {
    background: rgba(255, 255, 255, .9) !important;
    border-color: #FFFFFF !important;
    color: var(--brand-hover) !important;
}

/* 其余工具/状态按钮：统一为半透明白幽灵按钮（蓝底上语义彩色会显脏） */
.student-page .nav-btn-secondary,
.teacher-page .nav-btn-secondary,
.student-page .nav-btn-success,
.teacher-page .nav-btn-success,
.student-page .nav-btn-warning,
.teacher-page .nav-btn-warning,
.student-page .nav-btn-info,
.teacher-page .nav-btn-info,
.student-page .nav-btn-danger,
.teacher-page .nav-btn-danger {
    background: rgba(255, 255, 255, .12) !important;
    color: #FFFFFF !important;
    border-color: rgba(255, 255, 255, .35) !important;
}
.student-page .nav-btn-secondary:hover,
.teacher-page .nav-btn-secondary:hover,
.student-page .nav-btn-success:hover,
.teacher-page .nav-btn-success:hover,
.student-page .nav-btn-warning:hover,
.teacher-page .nav-btn-warning:hover,
.student-page .nav-btn-info:hover,
.teacher-page .nav-btn-info:hover,
.student-page .nav-btn-danger:hover,
.teacher-page .nav-btn-danger:hover {
    background: rgba(255, 255, 255, .24) !important;
    color: #FFFFFF !important;
    border-color: rgba(255, 255, 255, .75) !important;
}

/* 顶栏内 select 保持白底（蓝底上可读） */
.page-header select {
    height: 32px;
    border: 1px solid rgba(255, 255, 255, .4);
    border-radius: var(--radius);
    background: #FFFFFF;
    color: var(--text);
    font-size: 13px;
    padding: 0 8px;
}
.page-header .mini-countdown {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    height: 32px;
    padding: 0 12px;
    background: rgba(255, 255, 255, .16);
    color: #FFFFFF;
    border: 1px solid rgba(255, 255, 255, .35);
    border-radius: var(--radius);
    font-size: 13px;
}

/* =========================================================
 * 数据看板统计卡片：白底深字 + 细边框 + 状态色左条
 * （替换原紫蓝/彩色渐变卡片，解决白字不可见）
 * ========================================================= */
.stats-card {
    background: var(--card) !important;
    background-image: none !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    border-left: 3px solid var(--brand) !important;
    border-radius: var(--radius) !important;
    box-shadow: var(--shadow-card) !important;
    padding: 18px 20px !important;
    transition: border-color .15s ease, box-shadow .15s ease !important;
}
.stats-card:hover {
    transform: none !important;
    box-shadow: 0 2px 8px rgba(16, 32, 48, .10) !important;
}
.stats-card .stats-value {
    color: var(--text) !important;
    font-size: 28px !important;
    font-weight: 700 !important;
    font-variant-numeric: tabular-nums;
    line-height: 1.25 !important;
}
.stats-card .stats-label {
    color: var(--text-3) !important;
    font-size: 13px !important;
    opacity: 1 !important;
}
.stats-card .stats-icon {
    font-size: 28px !important;
    margin-bottom: 8px !important;
}
/* 系统状态四类卡片：成功/警示/信息/危险左条 */
.stats-card.stats-card-success { border-left-color: var(--success) !important; }
.stats-card.stats-card-warning { border-left-color: var(--warning) !important; }
.stats-card.stats-card-info { border-left-color: var(--brand) !important; }
.stats-card.stats-card-danger { border-left-color: var(--danger) !important; }

/* admin 题库管理小统计条 */
.question-stats .stat-item,
.mini-stat {
    background: var(--card) !important;
    border: 1px solid var(--border) !important;
    border-left: 3px solid var(--brand) !important;
    border-radius: var(--radius) !important;
    color: var(--text) !important;
}
.question-stats .stat-value,
.mini-stat .mini-value {
    color: var(--text) !important;
}
.question-stats .stat-label,
.mini-stat .mini-label {
    color: var(--text-3) !important;
}
.mini-stat:nth-child(2) { border-left-color: var(--success) !important; }
.mini-stat:nth-child(3) { border-left-color: var(--warning) !important; }
.mini-stat:nth-child(4) { border-left-color: var(--danger) !important; }

/* =========================================================
 * 弹窗统一（含 modal-v2 / form-modal / modal-overlay / 通用 modal）
 * 头部改白底深字 + 底部分隔线（Fluent 风），不再使用整面蓝头
 * ========================================================= */
.modal-v2-content,
.form-modal-content,
.custom-modal-content {
    background: var(--card) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--radius-lg) !important;
    box-shadow: 0 8px 32px rgba(16, 32, 48, .14) !important;
    color: var(--text) !important;
}

.modal-v2-header,
.form-modal-header {
    background: var(--card) !important;
    color: var(--text) !important;
    border-bottom: 1px solid var(--border) !important;
    padding: 14px 20px !important;
}
.modal-v2-header h3,
.form-modal-header h3,
.form-modal-header .modal-title { color: var(--text) !important; font-size: 16px !important; }
.modal-v2-close,
.form-modal-close {
    background: transparent !important;
    color: var(--text-2) !important;
    border: none !important;
}
.modal-v2-close:hover,
.form-modal-close:hover { background: var(--brand-soft) !important; color: var(--brand) !important; }
.modal-v2-body,
.form-modal-body { color: var(--text) !important; }
.modal-v2-footer,
.form-modal-footer {
    background: var(--bg) !important;
    border-top: 1px solid var(--border) !important;
}

.btn-m2-primary,
.btn-m2.btn-primary,
.modal-v2-footer .btn-primary {
    background: var(--brand) !important;
    color: #FFFFFF !important;
    border: 1px solid var(--brand) !important;
    border-radius: var(--radius) !important;
}
.btn-m2-primary:hover { background: var(--brand-hover) !important; }
.btn-m2-secondary,
.btn-m2.btn-secondary {
    background: var(--card) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--radius) !important;
}
.btn-m2-secondary:hover { color: var(--brand) !important; border-color: var(--brand) !important; }
.btn-m2-danger {
    background: rgba(220, 38, 38, .08) !important;
    color: var(--danger) !important;
    border: 1px solid rgba(220, 38, 38, .35) !important;
    border-radius: var(--radius) !important;
}

/* 通用弹窗头部/底部（style.css 体系） */
.modal-header {
    background: var(--card) !important;
    color: var(--text) !important;
    border-bottom: 1px solid var(--border) !important;
}
.modal-header h3,
.modal-header .modal-title { color: var(--text) !important; }
.modal-close,
.close-btn {
    color: var(--text-2) !important;
    background: transparent !important;
    border: none !important;
}
.modal-close:hover,
.close-btn:hover { color: var(--brand) !important; background: var(--brand-soft) !important; }
.modal-body { color: var(--text) !important; }
.modal-footer {
    background: var(--card) !important;
    border-top: 1px solid var(--border) !important;
}
.form-modal {
    background: rgba(15, 23, 42, .45) !important;
}
.form-modal > div,
.modal-box,
.modal-panel {
    background: var(--card) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--radius-lg) !important;
    box-shadow: 0 8px 32px rgba(16, 32, 48, .14) !important;
}

/* 弹窗内 label / 文字 */
.modal label,
.modal-v2-content label,
.form-modal-content label {
    color: var(--text) !important;
}

/* 弹窗遮罩统一（保留半透明，去掉纯黑死沉感） */
.modal-overlay,
.modal-mask,
.custom-modal-overlay {
    background: rgba(15, 23, 42, .45) !important;
}

/* =========================================================
 * 宠物乐园（pet-park）：头部/标签/按钮跟随主题，保留游戏化元素
 * ========================================================= */
body:not(.cs-raw-theme) .pet-header {
    background: var(--nav-bg) !important;
    background-image: none !important;
    color: var(--text) !important;
    border-bottom: 1px solid var(--border) !important;
    box-shadow: none !important;
}
.pet-header-left h1 { color: var(--text) !important; }
.pet-nav-tab {
    color: var(--text-2) !important;
}
.pet-nav-tab:hover {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}
.pet-nav-tab.active {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
    font-weight: 600 !important;
}
.pet-user-info {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}
.pet-logout-btn {
    background: rgba(220, 38, 38, .08) !important;
    border: 1px solid rgba(220, 38, 38, .35) !important;
    color: var(--danger) !important;
}
.pet-logout-btn:hover { background: rgba(220,38,38,.14) !important; }
/* 宠物展示区/商店/日志等内容卡片白底化（保留金币、宠物场景等游戏色） */
.pet-display-section,
.pet-store-item,
.pet-log-item,
.pet-dex-grid > div {
    background: var(--card) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--radius-lg) !important;
    box-shadow: var(--shadow-card) !important;
    color: var(--text) !important;
}
.pet-store-item .item-name { color: var(--text) !important; }
.pet-store-item .item-desc { color: var(--text-3) !important; }
.pet-store-item .buy-btn {
    background: var(--brand) !important;
    background-image: none !important;
    border: 1px solid var(--brand) !important;
    border-radius: var(--radius) !important;
    box-shadow: none !important;
}
.pet-store-item .buy-btn:hover { background: var(--brand-hover) !important; box-shadow: none !important; }
.pet-tab-btn { color: var(--text-3) !important; }
.pet-tab-btn.active { color: var(--brand) !important; }
.pet-empty-state { color: var(--text-3) !important; }

/* 宠物弹窗：橙色渐变头 → 白底深字 + 分隔线 */
.pet-modal-overlay { background: rgba(15, 23, 42, .45) !important; }
.pet-modal {
    background: var(--card) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--radius-lg) !important;
    color: var(--text) !important;
    box-shadow: 0 8px 32px rgba(16, 32, 48, .14) !important;
}
.pet-modal-header {
    background: var(--card) !important;
    background-image: none !important;
    color: var(--text) !important;
    border-bottom: 1px solid var(--border) !important;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0 !important;
}
.pet-modal-header h2 { color: var(--text) !important; }
.pet-modal-body { color: var(--text) !important; }
.pet-btn-primary, .pet-action-btn,
.pet-modal-btn.primary {
    background: var(--brand) !important;
    color: #FFFFFF !important;
    border: 1px solid var(--brand) !important;
    border-radius: var(--radius) !important;
    background-image: none !important;
}
.pet-btn-primary:hover { background: var(--brand-hover) !important; }

/* =========================================================
 * Scratch 作业列表（scratch-list）：头部去紫渐变
 * 注意：裸 .header 被考试/评测系列页面（exam、gesp、cie 等 14 个
 * 自定义深色渐变头部页面）复用，这些页面在 <body> 上加
 * cs-preserve-header 豁免，保留各自头部配色与白色按钮对比度。
 * ========================================================= */
body:not(.cs-preserve-header) .header {
    background: var(--nav-bg) !important;
    background-image: none !important;
    color: var(--text) !important;
    border-bottom: 1px solid var(--border) !important;
    box-shadow: none !important;
}
body:not(.cs-preserve-header) .header h1 { color: var(--text) !important; }
body:not(.cs-preserve-header) .header .btn-light,
body:not(.cs-preserve-header) .header .btn-sm {
    background: var(--card) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--radius) !important;
}
body:not(.cs-preserve-header) .header .btn-light:hover { color: var(--brand) !important; border-color: var(--brand) !important; }

.btn-scratch-enter {
    background: var(--brand) !important;
    color: #FFFFFF !important;
    border: 1px solid var(--brand) !important;
    border-radius: var(--radius) !important;
    box-shadow: none !important;
}
.btn-scratch-enter:hover {
    background: var(--brand-hover) !important;
    color: #FFFFFF !important;
    transform: none !important;
    box-shadow: none !important;
}

/* Scratch 图标（标题前的小猫 logo） */
.cs-scratch-logo {
    width: 22px;
    height: 22px;
    vertical-align: -5px;
    margin-right: 6px;
    border-radius: 4px;
}

/* community 标签条 */
.ct-tab {
    color: var(--text-2) !important;
    border-radius: var(--radius) var(--radius) 0 0 !important;
}
.ct-tab.active {
    color: var(--brand) !important;
    background: var(--brand-soft) !important;
    font-weight: 600 !important;
}

/* =========================================================
 * 教务管理系统（student-management）：深紫侧边栏 → 主题化
 * ========================================================= */
.app-sidebar {
    background: var(--nav-bg) !important;
    background-image: none !important;
    border-right: 1px solid var(--border) !important;
}
.sidebar-brand .brand-text h1,
.sidebar-brand .brand-text p {
    color: var(--text) !important;
}
.sidebar-brand .brand-text p { color: var(--text-3) !important; }
.nav-section-title { color: var(--text-3) !important; }
.nav-menu-item {
    color: var(--nav-text) !important;
    border-radius: var(--radius) !important;
}
.nav-menu-item:hover {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}
.nav-menu-item.active {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
    box-shadow: none !important;
}
.nav-menu-item.active::before { background: var(--brand) !important; }
:root[data-theme="nova"] .app-sidebar {
    background: var(--nav-bg) !important;
    border-right: none !important;
}
:root[data-theme="nova"] .sidebar-brand .brand-text h1 { color: #FFFFFF !important; }
:root[data-theme="nova"] .sidebar-brand .brand-text p { color: var(--nav-text) !important; }
:root[data-theme="nova"] .nav-section-title { color: var(--nav-text) !important; }
:root[data-theme="nova"] .nav-menu-item { color: var(--nav-text) !important; }
:root[data-theme="nova"] .nav-menu-item:hover { background: rgba(255,255,255,.06) !important; color: #FFFFFF !important; }
:root[data-theme="nova"] .nav-menu-item.active { background: var(--nav-soft) !important; color: #FFFFFF !important; }
:root[data-theme="nova"] .sidebar-version,
:root[data-theme="nova"] .btn-back-home { color: var(--nav-text) !important; }
:root[data-theme="nova"] .btn-back-home { background: rgba(255,255,255,.06) !important; border-color: rgba(255,255,255,.15) !important; }

/* 教务彩色概览卡 → 白底 + 状态色左条/图标 */
.ov-card-1, .ov-card-2, .ov-card-3, .ov-card-4 {
    background: var(--card) !important;
    background-image: none !important;
    border: 1px solid var(--border) !important;
    border-left: 3px solid var(--brand) !important;
    border-radius: var(--radius) !important;
    color: var(--text) !important;
    box-shadow: var(--shadow-card) !important;
}
.ov-card-2 { border-left-color: #7C3AED !important; }
.ov-card-3 { border-left-color: var(--brand) !important; }
.ov-card-4 { border-left-color: var(--success) !important; color: var(--text) !important; }
.ov-card-1 *, .ov-card-2 *, .ov-card-3 *, .ov-card-4 * {
    color: var(--text) !important;
}
.ov-card-4 * { color: var(--text) !important; }

.btn-back-home {
    background: var(--card) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    border-radius: var(--radius) !important;
}
.btn-back-home:hover { color: var(--brand) !important; border-color: var(--brand) !important; }
.sidebar-version { color: var(--text-3) !important; }

/* 教务残留紫色元素：内联按钮 / 学生卡片头 / 日期标签 */
.btn-inline {
    background: var(--brand) !important;
    background-image: none !important;
    border: 1px solid var(--brand) !important;
    color: #FFFFFF !important;
    border-radius: var(--radius) !important;
}
.btn-inline:hover { background: var(--brand-hover) !important; }
.student-card .card-header {
    background: var(--nav-bg) !important;
    background-image: none !important;
    color: var(--text) !important;
    border-bottom: 1px solid var(--border) !important;
}
.day-badge {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}

/* 教务主内容按钮主色 */
.app-main .btn-primary,
.app-main button.primary {
    background: var(--brand) !important;
    background-image: none !important;
    border-color: var(--brand) !important;
    color: #FFFFFF !important;
    border-radius: var(--radius) !important;
}

/* toast 去渐变 */
.toast { background: var(--text) !important; color: #FFFFFF !important; }
.toast.success { background: var(--success) !important; }
.toast.error { background: var(--danger) !important; }
.toast.info { background: var(--brand) !important; }
.toast.warning { background: var(--warning) !important; }

/* =========================================================
 * 打字模块（dazi）导航去紫渐变
 * ========================================================= */
.navbar {
    background: var(--nav-bg) !important;
    background-image: none !important;
    border-bottom: 1px solid var(--border) !important;
    color: var(--text) !important;
    backdrop-filter: none !important;
}
.navbar .logo-text {
    background: none !important;
    -webkit-background-clip: initial !important;
    background-clip: initial !important;
    color: var(--text) !important;
}
.nav-tab {
    color: var(--text-2) !important;
    border: 1px solid transparent !important;
    background: transparent !important;
    box-shadow: none !important;
}
.nav-tab:hover {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}
.nav-tab.active {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
    border-color: transparent !important;
    font-weight: 600 !important;
    box-shadow: none !important;
}
.sidebar-login-btn,
button.primary,
.btn-primary-dazi {
    background: var(--brand) !important;
    color: #FFFFFF !important;
    border: 1px solid var(--brand) !important;
    border-radius: var(--radius) !important;
    background-image: none !important;
}

/* =========================================================
 * 教学白板（whiteboard）：紫色渐变工具条 → 白底
 * ========================================================= */
.topbar {
    background: var(--nav-bg) !important;
    background-image: none !important;
    color: var(--text) !important;
    border-bottom: 1px solid var(--border) !important;
}
.topbar .back {
    background: var(--bg) !important;
    color: var(--text-2) !important;
    border: 1px solid var(--border) !important;
}
.topbar .back:hover {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}

/* =========================================================
 * SVG 图标跟随文字色（导航/侧边栏内）
 * ========================================================= */
.sidebar-menu li svg,
.nav-menu-item svg,
.pet-nav-tab svg,
.ct-tab svg {
    fill: none;
}

/* =========================================================
 * 通用带渐变的头部/区块兜底（h1/h2 标题色）
 * ========================================================= */
[class*="header"] h1,
[class*="header"] h2 {
    /* 不做强制，交由具体选择器；此规则仅防止遗漏的深紫渐变头里白字 */
}

/* =========================================================
 * v3 全站护眼排版：正文/表格/表单/卡片字号统一上调
 * 原则：正文不小于 14px、辅助文字不小于 13px，行高放宽；
 * 不触碰代码编辑器（ace / CodeMirror / .code-editor）与
 * cs-raw-theme 全屏应用页，避免破坏固定布局。
 * ========================================================= */
body:not(.cs-raw-theme) p,
body:not(.cs-raw-theme) li,
body:not(.cs-raw-theme) dd,
body:not(.cs-raw-theme) blockquote {
    font-size: 15px;
    line-height: 1.7;
}
body:not(.cs-raw-theme) h1 { font-size: 22px; line-height: 1.35; }
body:not(.cs-raw-theme) h2 { font-size: 19px; line-height: 1.35; }
body:not(.cs-raw-theme) h3 { font-size: 17px; line-height: 1.4; }
body:not(.cs-raw-theme) h4 { font-size: 15px; line-height: 1.45; }
body:not(.cs-raw-theme) h5 { font-size: 14px; line-height: 1.5; }

/* 面板标题 */
body:not(.cs-raw-theme) .panel-header h3,
body:not(.cs-raw-theme) .panel-header h4,
body:not(.cs-raw-theme) .panel-title {
    font-size: 16px !important;
    line-height: 1.45 !important;
}

/* 数据表格：13→14px，行高放松，长时阅读不费眼 */
body:not(.cs-raw-theme) table th,
body:not(.cs-raw-theme) table td {
    font-size: 14px !important;
    line-height: 1.6 !important;
}

/* 表单：输入控件统一 14px（排除编辑器工具栏与代码编辑区） */
body:not(.cs-raw-theme) input:not([type="checkbox"]):not([type="radio"]):not(.font-size-select),
body:not(.cs-raw-theme) select,
body:not(.cs-raw-theme) textarea,
body:not(.cs-raw-theme) .form-control,
body:not(.cs-raw-theme) .form-select {
    font-size: 14px;
}
body:not(.cs-raw-theme) label,
body:not(.cs-raw-theme) .form-group label,
body:not(.cs-raw-theme) .filter-label {
    font-size: 14px;
}

/* 通用按钮（.nav-btn 已单独定义；图标按钮 .tool-btn 不放大） */
body:not(.cs-raw-theme) .btn:not(.tool-btn):not(.btn-icon):not(.btn-small):not(.btn-sm) {
    font-size: 14px !important;
}
body:not(.cs-raw-theme) .btn-small,
body:not(.cs-raw-theme) .btn-sm {
    font-size: 13px !important;
}

/* 卡片/列表正文与标题 */
body:not(.cs-raw-theme) .card-title,
body:not(.cs-raw-theme) .course-card .title,
body:not(.cs-raw-theme) .question-title,
body:not(.cs-raw-theme) .list-item-title {
    font-size: 15px !important;
    line-height: 1.5 !important;
}
body:not(.cs-raw-theme) .card-body,
body:not(.cs-raw-theme) .card-sub,
body:not(.cs-raw-theme) .subtitle,
body:not(.cs-raw-theme) .desc,
body:not(.cs-raw-theme) .description {
    font-size: 14px !important;
    line-height: 1.65 !important;
}

/* 辅助/说明文字：最低 13px（原 11-12px 上调，保证教室投影可读） */
body:not(.cs-raw-theme) .stat-label,
body:not(.cs-raw-theme) .stats-label,
body:not(.cs-raw-theme) .mini-stat .label,
body:not(.cs-raw-theme) .text-muted,
body:not(.cs-raw-theme) .text-secondary,
body:not(.cs-raw-theme) .hint,
body:not(.cs-raw-theme) .tip,
body:not(.cs-raw-theme) .help-text,
body:not(.cs-raw-theme) .placeholder,
body:not(.cs-raw-theme) .empty,
body:not(.cs-raw-theme) .empty-tip,
body:not(.cs-raw-theme) .meta,
body:not(.cs-raw-theme) .card-meta,
body:not(.cs-raw-theme) .card-count,
body:not(.cs-raw-theme) .card-tag,
body:not(.cs-raw-theme) .count,
body:not(.cs-raw-theme) .sidebar-version {
    font-size: 13px !important;
    line-height: 1.55 !important;
}

/* 侧边/菜单导航：14px 更易点读 */
body:not(.cs-raw-theme) .sidebar-menu li,
body:not(.cs-raw-theme) .nav-menu-item,
body:not(.cs-raw-theme) .menu-item,
body:not(.cs-raw-theme) .side-menu li,
body:not(.cs-raw-theme) .tab-btn,
body:not(.cs-raw-theme) .sub-tab-btn {
    font-size: 14px !important;
}

/* 弹窗正文 */
body:not(.cs-raw-theme) .modal-v2-body,
body:not(.cs-raw-theme) .modal-body,
body:not(.cs-raw-theme) .form-modal-body {
    font-size: 15px !important;
    line-height: 1.7 !important;
}
body:not(.cs-raw-theme) .modal-v2-header h3,
body:not(.cs-raw-theme) .modal-header h3,
body:not(.cs-raw-theme) .form-modal-header h3 {
    font-size: 17px !important;
}

/* 学生/教师端业务面板文字（公告、讲解、状态等） */
.student-page .announcement-placeholder,
.teacher-page .announcement-placeholder,
.student-page .share-hint,
.teacher-page .reward-tip,
.student-page .placeholder-text {
}

/* =========================================================
 * problem-list.html / problem-manage.html
 * 棕金色硬编码 → 主题变量覆盖（不影响难度标签语义色）
 * ========================================================= */
body:not(.cs-raw-theme) .page-header {
    background: var(--brand) !important;
    color: #fff !important;
    box-shadow: 0 2px 8px rgba(15,108,189,.28) !important;
}
body:not(.cs-raw-theme) .page-header .header-left h1 {
    color: #fff !important;
}
body:not(.cs-raw-theme) .page-header .nav-tab {
    color: rgba(255,255,255,.82) !important;
}
body:not(.cs-raw-theme) .page-header .nav-tab:hover {
    background: rgba(255,255,255,.14) !important;
}
body:not(.cs-raw-theme) .page-header .nav-tab.active {
    background: #fff !important;
    color: var(--brand) !important;
    font-weight: 600 !important;
}
body:not(.cs-raw-theme) .page-header .user-info {
    color: #fff !important;
}
/* 角色徽章：实心品牌色 + 白字（替代之前的半透明，对比度足够） */
body:not(.cs-raw-theme) .page-header .user-role,
body:not(.cs-raw-theme) .page-header .role-badge,
body:not(.cs-raw-theme) .page-header .admin-badge {
    background: rgba(255,255,255,.2) !important;
    border: 1px solid rgba(255,255,255,.35) !important;
    color: #fff !important;
    font-weight: 500 !important;
    padding: 3px 11px !important;
    border-radius: 14px !important;
    font-size: 12px !important;
}
/* admin-btn 改为浅灰幽灵按钮，hover 变品牌蓝 */
body:not(.cs-raw-theme) .admin-btn {
    background: rgba(255,255,255,.12) !important;
    border: 1px solid rgba(255,255,255,.35) !important;
    color: #fff !important;
    border-radius: 6px !important;
    padding: 7px 14px !important;
}
body:not(.cs-raw-theme) .admin-btn:hover {
    background: rgba(255,255,255,.25) !important;
}

/* problem-manage.html 左侧深色渐变侧栏 → 品牌色渐变 */
body:not(.cs-raw-theme) .sidebar,
body:not(.cs-raw-theme) .left-sidebar {
    background: var(--brand) !important;
    color: #fff !important;
}
body:not(.cs-raw-theme) .sidebar .sidebar-menu li:hover,
body:not(.cs-raw-theme) .sidebar-menu li:hover {
    background: rgba(255,255,255,.14) !important;
    color: #fff !important;
}
body:not(.cs-raw-theme) .sidebar .sidebar-menu li.active,
body:not(.cs-raw-theme) .sidebar-menu li.active {
    background: #fff !important;
    color: var(--brand) !important;
    border-left: 3px solid #fff !important;
}
body:not(.cs-raw-theme) .sidebar .sidebar-title,
body:not(.cs-raw-theme) .sidebar-title {
    color: rgba(255,255,255,.75) !important;
}

/* body 背景统一 */
body:not(.cs-raw-theme) body,
body:not(.cs-raw-theme) body {
    background: var(--bg) !important;
}
/* 通用链接/强调色 */
body:not(.cs-raw-theme) .breadcrumb .crumb-current { color: var(--text) !important; }
body:not(.cs-raw-theme) .breadcrumb .crumb-link { color: var(--text-2) !important; }
body:not(.cs-raw-theme) .breadcrumb .crumb-link:hover { color: var(--brand) !important; }

/* 表单 focus 边框色 */
body:not(.cs-raw-theme) input:focus,
body:not(.cs-raw-theme) textarea:focus,
body:not(.cs-raw-theme) select:focus {
    border-color: var(--brand) !important;
    outline: none !important;
}

/* 表格 hover 行 */
body:not(.cs-raw-theme) .data-table tbody tr:hover,
body:not(.cs-raw-theme) table tbody tr:hover {
    background: var(--brand-soft) !important;
}

/* 分页按钮 hover */
body:not(.cs-raw-theme) .pagination button:hover:not(:disabled) {
    border-color: var(--brand) !important;
    color: var(--brand) !important;
}
body:not(.cs-raw-theme) .pagination button.active {
    background: var(--brand) !important;
    border-color: var(--brand) !important;
    color: #fff !important;
}

/* 通用按钮（problem-manage 的工具栏按钮等） */
body:not(.cs-raw-theme) .toolbar button,
body:not(.cs-raw-theme) .toolbar .btn,
body:not(.cs-raw-theme) button.primary,
body:not(.cs-raw-theme) .btn-primary {
    background: var(--brand) !important;
    color: #fff !important;
    border: 1px solid var(--brand) !important;
    border-radius: 6px !important;
}
body:not(.cs-raw-theme) .toolbar button:hover,
body:not(.cs-raw-theme) .toolbar .btn:hover,
body:not(.cs-raw-theme) button.primary:hover,
body:not(.cs-raw-theme) .btn-primary:hover {
    background: var(--brand-hover) !important;
    border-color: var(--brand-hover) !important;
}
body:not(.cs-raw-theme) .toolbar button.ghost,
body:not(.cs-raw-theme) button.secondary,
body:not(.cs-raw-theme) .btn-secondary {
    background: #fff !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
}
body:not(.cs-raw-theme) .toolbar button.ghost:hover,
body:not(.cs-raw-theme) button.secondary:hover,
body:not(.cs-raw-theme) .btn-secondary:hover {
    color: var(--brand) !important;
    border-color: var(--brand) !important;
}
/* 编辑/删除 icon 按钮 */
body:not(.cs-raw-theme) .btn-icon.edit {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}
body:not(.cs-raw-theme) .btn-icon.edit:hover {
    background: var(--brand) !important;
    color: #fff !important;
}

/* stat 卡片 */
body:not(.cs-raw-theme) .stat-card .stat-icon {
    color: var(--brand) !important;
    background: var(--brand-soft) !important;
}

/* 上传区域 */
body:not(.cs-raw-theme) .upload-area {
    border-color: var(--border) !important;
    background: #fff !important;
}
body:not(.cs-raw-theme) .upload-area:hover {
    border-color: var(--brand) !important;
    background: var(--brand-soft) !important;
}
body:not(.cs-raw-theme) .upload-area .upload-icon {
    color: var(--brand) !important;
}

/* ===== problem-list.html / problem-manage.html 剩余棕金色覆盖 ===== */
/* filter-banner（problem-list）：原棕金渐变 → 品牌色 */
body:not(.cs-raw-theme) .filter-banner {
    background: var(--brand) !important;
    color: #fff !important;
}
body:not(.cs-raw-theme) .filter-clear-btn {
    background: rgba(255,255,255,.18) !important;
    border-color: rgba(255,255,255,.4) !important;
    color: #fff !important;
}
body:not(.cs-raw-theme) .filter-clear-btn:hover {
    background: rgba(255,255,255,.3) !important;
}
/* search-box:focus */
body:not(.cs-raw-theme) .search-box input:focus,
body:not(.cs-raw-theme) .toolbar .search-input:focus,
body:not(.cs-raw-theme) .toolbar select:focus {
    border-color: var(--brand) !important;
}
/* filter-chip 激活态（problem-list 通用 + 分类独立） */
body:not(.cs-raw-theme) .filter-chip.active {
    background: var(--brand) !important;
    color: #fff !important;
    border-color: var(--brand) !important;
}
body:not(.cs-raw-theme) .filter-chip:hover {
    border-color: var(--brand) !important;
}
/* refresh-btn（problem-list） */
body:not(.cs-raw-theme) .refresh-btn {
    background: var(--brand) !important;
    color: #fff !important;
    border: none !important;
}
body:not(.cs-raw-theme) .refresh-btn:hover {
    background: var(--brand-hover) !important;
}
/* tag-chip 激活态（problem-list 标签区） */
body:not(.cs-raw-theme) .tag-chip {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
    border-color: transparent !important;
}
body:not(.cs-raw-theme) .tag-chip:hover {
    background: #fff !important;
    border-color: var(--brand) !important;
}
body:not(.cs-raw-theme) .tag-chip.active {
    background: var(--brand) !important;
    color: #fff !important;
}
/* 表格表头 th.sortable:hover */
body:not(.cs-raw-theme) table.problem-table th.sortable:hover {
    color: var(--brand) !important;
}
/* problem-manage sidebar-brand logo 棕金渐变 → 品牌色 */
body:not(.cs-raw-theme) .sidebar-brand .logo-icon {
    background: var(--brand-hover) !important;
}
/* problem-manage menu-group.open 棕色调 → 半透明白 */
body:not(.cs-raw-theme) .sidebar-menu .menu-group.open .menu-parent {
    background: rgba(255,255,255,.15) !important;
}
body:not(.cs-raw-theme) .sidebar-menu .submenu li:hover::before {
    background: #fff !important;
}
body:not(.cs-raw-theme) .sidebar-menu .submenu li.active {
    background: rgba(255,255,255,.15) !important;
    border-left-color: #fff !important;
}
/* problem-manage top-bar */
body:not(.cs-raw-theme) .top-bar {
    background: var(--card) !important;
    border-bottom-color: var(--border) !important;
}
/* problem-manage breadcrumb */
body:not(.cs-raw-theme) .breadcrumb { color: var(--text-2) !important; }
body:not(.cs-raw-theme) .breadcrumb .crumb-sep { color: var(--text-3) !important; }
body:not(.cs-raw-theme) .breadcrumb .crumb-current { color: var(--text) !important; }
body:not(.cs-raw-theme) .breadcrumb .crumb-link:hover { color: var(--brand) !important; }
/* problem-manage user-chip + role-tag */
body:not(.cs-raw-theme) .top-actions .user-chip {
    background: var(--brand-soft) !important;
    color: var(--text) !important;
}
body:not(.cs-raw-theme) .top-actions .role-tag {
    background: var(--brand) !important;
    color: #fff !important;
}
/* problem-manage panel */
body:not(.cs-raw-theme) .panel {
    box-shadow: 0 2px 8px rgba(0,0,0,.04) !important;
}
body:not(.cs-raw-theme) .panel-header {
    background: var(--bg) !important;
    border-bottom-color: var(--border) !important;
}
body:not(.cs-raw-theme) .panel-header h2 {
    color: var(--text) !important;
}
/* problem-manage data-table 表头 */
body:not(.cs-raw-theme) .data-table thead {
    background: var(--bg) !important;
}
body:not(.cs-raw-theme) .data-table th {
    color: var(--text) !important;
    border-bottom-color: var(--border) !important;
}
body:not(.cs-raw-theme) .data-table td {
    color: var(--text) !important;
    border-bottom-color: var(--border) !important;
}
body:not(.cs-raw-theme) .data-table tbody tr:hover {
    background: var(--brand-soft) !important;
}
body:not(.cs-raw-theme) .table-wrapper {
    border-color: var(--border) !important;
}
/* problem-manage 空状态 */
body:not(.cs-raw-theme) .empty-state { color: var(--text-3) !important; }
body:not(.cs-raw-theme) .empty-state h3 { color: var(--text-2) !important; }
/* problem-manage toolbar filter-group 文字色 */
body:not(.cs-raw-theme) .toolbar .filter-group { color: var(--text-2) !important; }
body:not(.cs-raw-theme) .toolbar .search-input,
body:not(.cs-raw-theme) .toolbar select {
    border-color: var(--border) !important;
    background: var(--card) !important;
    color: var(--text) !important;
}
body:not(.cs-raw-theme) .toolbar select option { color: var(--text) !important; }
/* problem-manage btn-secondary 浅灰棕 → 主题灰 */
body:not(.cs-raw-theme) .btn-secondary {
    background: var(--card) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
}
body:not(.cs-raw-theme) .btn-secondary:hover {
    background: var(--bg) !important;
    border-color: var(--brand) !important;
    color: var(--brand) !important;
}

/* ==================================================================
 * 学生阅读排版 & 护眼三态（标准 / 护眼米绿 / 夜间） 2026-09
 * 仅引入 js/reading-theme.js 的学生页会在 <html> 上设置
 * data-reading="normal|eye|dark"，管理页不受影响。
 * 字号档位：正文 18px / 行距 1.9（中小学护眼档）
 * ================================================================== */
:root {
    --fs-content: 18px;        /* 题面、题干等长文本 */
    --fs-content-title: 19px;  /* 小节标题（输入格式/输出格式） */
    --fs-content-sm: 16px;     /* 选项、表格、列表等次级阅读文字 */
    --fs-code: 15px;           /* 样例、代码块（过大会横向溢出） */
    --lh-content: 1.9;
    --lh-tight: 1.7;
}

/* 三态下学生页基准字号上调（覆盖全局 15px 基准），管理页不带 data-reading 不受影响 */
html[data-reading] body:not(.cs-raw-theme) {
    font-size: 16px !important;
    line-height: 1.8 !important;
}

/* ---- 护眼米绿：低饱和高明度，仅阅读区换色，导航保持品牌蓝 ---- */
/* 选择器须用 :root 与品牌主题 :root[data-theme] 同特异性，靠后置规则胜出 */
:root[data-reading="eye"] {
    --bg: #E9F1E1;
    --card: #F6FAF1;
    --border: #D2DEC3;
    --text: #2B3526;
    --text-2: #55604C;
    --text-3: #87917A;
    --reading-surface: #F6FAF1;
    --reading-surface-2: #EDF3E3;
    --reading-surface-border: #D2DEC3;
    --reading-input-bg: #F2F7EB;
}
html[data-reading="eye"] body:not(.cs-raw-theme) {
    background: var(--bg) !important;
    color: var(--text) !important;
}

/* ---- 夜间模式：晚自习场景，深墨绿灰底，对比度达 WCAG AA ---- */
:root[data-reading="dark"] {
    --bg: #161B18;
    --card: #212823;
    --border: #36413A;
    --text: #D8E0D2;
    --text-2: #9FAA97;
    --text-3: #707B6D;
    --brand-soft: #20303E;
    --reading-surface: #212823;
    --reading-surface-2: #19201C;
    --reading-surface-border: #36413A;
    --reading-input-bg: #1B221E;
}
html[data-reading="dark"] body:not(.cs-raw-theme) {
    background: var(--bg) !important;
    color: var(--text) !important;
}

/* ---- 三态下学生页高频硬编码白底容器统一换肤（标准态为白，无需覆盖） ---- */
html[data-reading="eye"] .training-card,
html[data-reading="eye"] .problem-card,
html[data-reading="eye"] .course-card,
html[data-reading="eye"] .card,
html[data-reading="eye"] .panel,
html[data-reading="eye"] .search-box,
html[data-reading="eye"] .filter-bar,
html[data-reading="eye"] .filter-banner,
html[data-reading="eye"] .modal-content,
html[data-reading="eye"] .toolbar,
html[data-reading="eye"] .table-container,
html[data-reading="eye"] .page-btn,
html[data-reading="eye"] .problem-left,
html[data-reading="eye"] .left-scroll,
html[data-reading="eye"] .problem-right,
html[data-reading="eye"] .main-content,
html[data-reading="eye"] .sidebar,
html[data-reading="eye"] .question-desc,
html[data-reading="eye"] .action-bar,
html[data-reading="eye"] .question-header,
html[data-reading="dark"] .training-card,
html[data-reading="dark"] .problem-card,
html[data-reading="dark"] .course-card,
html[data-reading="dark"] .card,
html[data-reading="dark"] .panel,
html[data-reading="dark"] .search-box,
html[data-reading="dark"] .filter-bar,
html[data-reading="dark"] .filter-banner,
html[data-reading="dark"] .modal-content,
html[data-reading="dark"] .toolbar,
html[data-reading="dark"] .table-container,
html[data-reading="dark"] .page-btn,
html[data-reading="dark"] .problem-left,
html[data-reading="dark"] .left-scroll,
html[data-reading="dark"] .problem-right,
html[data-reading="dark"] .main-content,
html[data-reading="dark"] .sidebar,
html[data-reading="dark"] .question-desc,
html[data-reading="dark"] .action-bar,
html[data-reading="dark"] .question-header {
    background: var(--reading-surface) !important;
    border-color: var(--reading-surface-border) !important;
    color: var(--text) !important;
}
html[data-reading="eye"] input:not([type="checkbox"]):not([type="radio"]),
html[data-reading="eye"] textarea,
html[data-reading="eye"] select,
html[data-reading="dark"] input:not([type="checkbox"]):not([type="radio"]),
html[data-reading="dark"] textarea,
html[data-reading="dark"] select {
    background: var(--reading-input-bg) !important;
    color: var(--text) !important;
    border-color: var(--reading-surface-border) !important;
}
html[data-reading="dark"] input::placeholder,
html[data-reading="dark"] textarea::placeholder { color: var(--text-3) !important; }

/* ---- 三态悬浮开关（右下角，不遮挡阅读区，无投影） ---- */
/* 猫头鹰草稿纸按钮为 90px 圆形：right:20 bottom:20，中心轴距右 65px、
   顶边距底 110px；开关 46px 置于其正上方 12px 间隙并同轴对齐 */
.reading-theme-toggle {
    position: fixed;
    right: 42px;
    bottom: 122px;
    z-index: 9998;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text);
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    box-shadow: none;
    transition: border-color .15s ease, transform .15s ease;
}
.reading-theme-toggle:hover { border-color: var(--brand); transform: translateY(-2px); }
html[data-reading="dark"] .reading-theme-toggle { background: #2A332D; }
@media (max-width: 768px) {
    /* 移动端猫头鹰缩为 64px：right/bottom 15px，中心轴距右 47px、顶边距底 79px */
    .reading-theme-toggle { right: 24px; bottom: 90px; }
}

/* ---- 学生页核心阅读排版（只要引入 reading-theme.js 即生效，含标准态） ---- */
/* problem.html 题面 */
html[data-reading] .section-body {
    font-size: var(--fs-content) !important;
    line-height: var(--lh-content) !important;
    color: var(--text);
}
html[data-reading] .section-body p { margin-bottom: 14px; }
html[data-reading] .section-body pre,
html[data-reading] .section-body code { font-size: var(--fs-code); }
html[data-reading] .section-body pre { line-height: var(--lh-tight); }
html[data-reading] .section-header { font-size: var(--fs-content-title) !important; }
html[data-reading] .sample-content,
html[data-reading] .sample-label { font-size: var(--fs-code) !important; }
html[data-reading] .sample-box,
html[data-reading] .sample-content,
html[data-reading] .section-body pre {
    background: var(--reading-surface-2, #F6F8FA);
    border-color: var(--reading-surface-border, #E0E3E8);
    color: var(--text);
}
/* exam.html 题干与选项 */
html[data-reading] .question-text {
    font-size: var(--fs-content) !important;
    line-height: var(--lh-content) !important;
}
html[data-reading] .option-item {
    font-size: var(--fs-content-sm) !important;
    line-height: var(--lh-content) !important;
}
/* problem-list.html 表格阅读字号 */
html[data-reading] table.problem-table td,
html[data-reading] table.problem-table th { font-size: var(--fs-content-sm) !important; }
/* 学生页通用：搜索框、筛选 chip、导航页签上调到 15px，点击目标更友好 */
html[data-reading] .search-box input,
html[data-reading] .filter-chip,
html[data-reading] .nav-tab,
html[data-reading] .tag-chip { font-size: 15px !important; }
/* problem-manage btn-icon.edit */
body:not(.cs-raw-theme) .btn-icon.edit {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}
body:not(.cs-raw-theme) .btn-icon.edit:hover {
    background: var(--brand) !important;
    color: #fff !important;
}
/* badge-info / badge-default 浅棕 → 主题灰 */
body:not(.cs-raw-theme) .badge-info { background: var(--brand-soft) !important; color: var(--brand) !important; }
body:not(.cs-raw-theme) .badge-default { background: var(--bg) !important; color: var(--text-2) !important; }

.student-page .explanation-textarea,
.teacher-page .explanation-textarea {
    font-size: 14px !important;
    line-height: 1.7 !important;
}

/* =========================================================
 * 响应式：小尺寸屏幕 / 窗口缩放适配
 * ========================================================= */

/* 笔记本及以下：顶栏可换行，按钮组横向滚动 */
@media (max-width: 1280px) {
    .page-header {
        flex-wrap: wrap !important;
        overflow: visible !important;
        padding: 8px 12px !important;
        gap: 8px !important;
    }
    .header-right {
        width: 100%;
        overflow-x: auto;
        flex-wrap: nowrap !important;
        padding-bottom: 4px;
    }
}

/* 平板：侧边栏收窄，统计卡两列 */
@media (max-width: 1024px) {
    .admin-content {
        grid-template-columns: 200px 1fr !important;
        gap: 12px !important;
    }
    .stats-overview {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 12px !important;
    }
    .student-page .nav-btn,
    .teacher-page .nav-btn,
    .page-header .nav-btn {
        font-size: 13px !important;
        height: 30px !important;
        min-height: 30px !important;
        padding: 0 11px !important;
    }
}

/* 手机：单列、侧边栏抽屉化由各页面自身处理，这里保证按钮可用 */
@media (max-width: 768px) {
    body { font-size: 14px; }
    .page-header {
        padding: 8px 10px !important;
    }
    .page-header .header-left h2 {
        font-size: 16px !important;
    }
    .student-page .page-header h2,
    .teacher-page .page-header h2 {
        font-size: 16px !important;
    }
    /* 校区名称手机端收小，避免顶栏挤压换行 */
    .page-header .user-campus {
        font-size: 14px !important;
        margin-left: 4px !important;
    }
    .header-right {
        gap: 6px !important;
    }
    .student-page .nav-btn,
    .teacher-page .nav-btn,
    .page-header .nav-btn {
        font-size: 13px !important;
        height: 32px !important;
        min-height: 32px !important;
        padding: 0 11px !important;
    }
    .student-page .nav-group,
    .teacher-page .nav-group {
        gap: 4px !important;
    }
    .stats-overview,
    .question-stats {
        grid-template-columns: 1fr 1fr !important;
    }
    .stats-card { padding: 14px !important; }
    .stats-card .stats-value { font-size: 22px !important; }

    /* 教务侧边栏在手机端改为横向滚动条 */
    .app-layout {
        grid-template-columns: 1fr !important;
    }
    .app-sidebar {
        position: static !important;
        width: 100% !important;
        max-height: none !important;
    }
    .app-sidebar .sidebar-nav {
        display: flex !important;
        overflow-x: auto !important;
        gap: 6px !important;
        padding-bottom: 8px;
    }
    .app-sidebar .nav-section-title,
    .app-sidebar .sidebar-footer {
        display: none !important;
    }
    .app-sidebar .nav-menu-item {
        white-space: nowrap !important;
    }

    /* 弹窗手机端满宽 */
    .modal-v2-content,
    .form-modal-content,
    .modal-content,
    .modal-box,
    .pet-modal {
        width: calc(100vw - 24px) !important;
        max-width: calc(100vw - 24px) !important;
    }

    /* admin 顶栏不挤压 */
    .admin-header {
        flex-wrap: wrap !important;
        gap: 8px !important;
    }
}

@media (max-width: 480px) {
    .stats-overview {
        grid-template-columns: 1fr !important;
    }
    .student-page .nav-btn,
    .teacher-page .nav-btn,
    .page-header .nav-btn {
        font-size: 12px !important;
        height: 30px !important;
        min-height: 30px !important;
        padding: 0 9px !important;
    }
}
