/**
 * 编程课堂笔记管理系统 - 样式表
 */

/* ============ 登录页面样式 ============ */
.login-page {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.login-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    margin: 20px;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 48px;
    margin-bottom: 10px;
}

.login-header h2 {
    color: var(--text-primary);
    font-size: 24px;
    margin-bottom: 5px;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.login-form {
    margin-bottom: 20px;
}

.login-form .form-group {
    margin-bottom: 20px;
}

.btn-block {
    width: 100%;
    padding: 12px;
    font-size: 16px;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    padding: 10px;
    border-radius: var(--radius);
    text-align: center;
    font-size: 14px;
}

.login-footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
}

/* ============ 侧边栏底部用户信息 ============ */
.sidebar-footer {
    padding: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
}

.user-avatar {
    font-size: 24px;
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-name {
    display: block;
    color: white;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    display: block;
    color: rgba(255, 255, 255, 0.5);
    font-size: 11px;
}

.btn-logout {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: rgba(255, 255, 255, 0.7);
    padding: 8px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 16px;
    transition: var(--transition);
}

.btn-logout:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* 移动端登出按钮 */
.mobile-logout-btn {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.8);
    font-size: 20px;
    cursor: pointer;
    padding: 5px 10px;
}

/* ============ 变量定义 ============ */
:root {
    --primary: #4F46E5;
    --primary-light: #6366F1;
    --primary-dark: #4338CA;
    --secondary: #10B981;
    --secondary-light: #34D399;
    --accent: #F59E0B;
    --accent-light: #FBBF24;
    --danger: #EF4444;
    --warning: #F59E0B;
    --success: #10B981;
    --bg-main: #F3F4F6;
    --bg-card: #FFFFFF;
    --bg-sidebar: #1F2937;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    --border: #E5E7EB;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
}

/* ============ 基础样式 ============ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    outline: none;
    font-family: inherit;
}

input, textarea, select {
    font-family: inherit;
    outline: none;
}

/* ============ 布局 ============ */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* ============ 侧边栏 ============ */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    color: #fff;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: var(--transition);
    z-index: 100;
}

.sidebar-header {
    padding: 24px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-logo {
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-close {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    padding: 4px;
}

/* ============ 移动端导航 ============ */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 50px;
    background: var(--bg-sidebar);
    color: #fff;
    align-items: center;
    padding: 0 16px;
    z-index: 90;
    gap: 12px;
}

.mobile-menu-btn {
    background: none;
    border: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    padding: 4px;
}

.mobile-title {
    font-size: 16px;
    font-weight: 600;
}

.sidebar-logo span {
    font-size: 24px;
}

.sidebar-nav {
    padding: 20px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 14px 20px;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
    cursor: pointer;
    gap: 12px;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.nav-item.active {
    background-color: var(--primary);
    color: #fff;
}

.nav-item span {
    font-size: 18px;
}

/* ============ 主内容区 ============ */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 24px;
}

/* ============ 页面标题 ============ */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.page-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ============ 卡片 ============ */
.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

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

/* ============ 统计卡片 ============ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 16px;
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-icon.blue { background: rgba(79, 70, 229, 0.1); color: var(--primary); }
.stat-icon.green { background: rgba(16, 185, 129, 0.1); color: var(--secondary); }
.stat-icon.orange { background: rgba(245, 158, 11, 0.1); color: var(--accent); }
.stat-icon.red { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.stat-icon.purple { background: rgba(139, 92, 246, 0.1); color: #8B5CF6; }
.stat-icon.teal { background: rgba(20, 184, 166, 0.1); color: #14B8A6; }
.stat-icon.pink { background: rgba(236, 72, 153, 0.1); color: #EC4899; }

.stat-info h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-info p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============ 按钮 ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

.btn-secondary {
    background-color: var(--bg-main);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--border);
}

.btn-success {
    background-color: var(--secondary);
    color: #fff;
}

.btn-success:hover {
    background-color: #059669;
}

.btn-danger {
    background-color: var(--danger);
    color: #fff;
}

.btn-danger:hover {
    background-color: #DC2626;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

/* ============ 表单 ============ */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    transition: var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

/* ============ 表格 ============ */
.table-container {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
    background-color: var(--bg-main);
}

.table tr:hover {
    background-color: var(--bg-main);
}

.table-actions {
    display: flex;
    gap: 8px;
}

/* ============ 日历 ============ */
.calendar-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    background: var(--primary);
    color: #fff;
}

.calendar-title {
    font-size: 18px;
    font-weight: 600;
}

.calendar-nav {
    display: flex;
    gap: 8px;
}

.calendar-nav button {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.calendar-nav button:hover {
    background: rgba(255, 255, 255, 0.3);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
}

.calendar-weekday {
    padding: 12px;
    text-align: center;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-main);
    border-bottom: 1px solid var(--border);
}

.calendar-day {
    min-height: 100px;
    padding: 8px;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}

.calendar-day:nth-child(7n) {
    border-right: none;
}

.calendar-day:hover {
    background: var(--bg-main);
}

.calendar-day.other-month {
    background: var(--bg-main);
    color: var(--text-light);
}

.calendar-day.today {
    background: rgba(79, 70, 229, 0.05);
}

.calendar-day.selected {
    background: rgba(79, 70, 229, 0.1);
}

.day-number {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 4px;
}

.today .day-number {
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.day-events {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.day-event {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ============ 学生卡片 ============ */
.students-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 12px;
}

.student-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.student-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.student-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--text-secondary);
    margin: 0 auto 8px;
    overflow: hidden;
}

.student-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.student-name {
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.student-grade {
    font-size: 11px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 4px;
}

.student-info {
    display: none;
}
    margin-bottom: 8px;
}

.student-info {
    font-size: 13px;
    color: var(--text-secondary);
}

.student-points {
    margin-top: 12px;
    text-align: center;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.student-tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    margin: 4px 4px 4px 0;
}

.student-tag.good { background: rgba(16, 185, 129, 0.1); color: var(--secondary); }
.student-tag.warning { background: rgba(245, 158, 11, 0.1); color: var(--accent); }
.student-tag.info { background: rgba(79, 70, 229, 0.1); color: var(--primary); }

/* ============ 模态框 ============ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.show {
    display: flex;
}

.modal {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-main);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--border);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border);
}

/* ============ 标签页 ============ */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.tab {
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ============ 头像上传 ============ */
.avatar-upload {
    display: flex;
    align-items: center;
    gap: 20px;
}

.avatar-preview {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--bg-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: var(--text-secondary);
    overflow: hidden;
}

.avatar-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-upload input[type="file"] {
    display: none;
}

.avatar-upload label {
    padding: 10px 20px;
    background: var(--bg-main);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.avatar-upload label:hover {
    background: var(--border);
}

/* ============ 状态指示 ============ */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.status-badge.present { background: rgba(16, 185, 129, 0.1); color: var(--secondary); }
.status-badge.absent { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.status-badge.late { background: rgba(245, 158, 11, 0.1); color: var(--accent); }

/* ============ 空状态 ============ */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state span {
    font-size: 64px;
    display: block;
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

/* ============ 加载动画 ============ */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-260px);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
}

@media (max-width: 768px) {
    .mobile-header {
        display: flex;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    }

    .mobile-menu-btn {
        width: 44px;
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 8px;
    }

    .mobile-title {
        font-size: 17px;
        font-weight: 600;
        flex: 1;
        text-align: center;
    }

    .main-content {
        padding-top: 66px;
        padding: 16px 16px 20px;
    }

    .sidebar {
        width: 280px;
        transform: translateX(-100%);
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-close {
        display: block;
    }

    .sidebar-nav {
        padding: 12px 0;
    }

    .nav-item {
        padding: 16px 20px;
        font-size: 15px;
        gap: 14px;
    }

    .nav-item span:first-child {
        font-size: 22px;
    }

    .nav-item.active {
        background: linear-gradient(90deg, var(--primary), var(--primary-light));
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        margin-bottom: 20px;
    }

    .page-title {
        font-size: 22px;
    }

    .page-header .btn {
        width: 100%;
        padding: 14px 20px;
        font-size: 15px;
        border-radius: 10px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        margin-bottom: 20px;
    }

    .stat-card {
        padding: 16px;
        border-radius: 12px;
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }

    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 22px;
    }

    .stat-info h3 {
        font-size: 24px;
    }

    .stat-info p {
        font-size: 12px;
    }

    .card {
        padding: 16px;
        border-radius: 12px;
        margin-bottom: 16px;
    }

    .card-header {
        margin-bottom: 14px;
    }

    .card-title {
        font-size: 15px;
    }

    .table th,
    .table td {
        padding: 10px 8px;
        font-size: 13px;
    }

    .table-actions {
        flex-direction: column;
        gap: 4px;
    }

    .table-actions .btn {
        padding: 6px 10px;
        font-size: 12px;
    }

    .students-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }

    .student-card {
        padding: 12px 8px;
        border-radius: 12px;
        cursor: pointer;
    }

    .student-avatar {
        width: 44px;
        height: 44px;
        font-size: 18px;
    }

    .student-name {
        font-size: 13px;
        margin-top: 6px;
    }

    .student-grade {
        font-size: 10px;
    }

    .ranking-list {
        gap: 10px;
    }

    .ranking-item {
        padding: 14px 12px;
        border-radius: 12px;
    }

    .ranking-position {
        font-size: 20px;
        width: 32px;
    }

    .ranking-avatar {
        width: 44px;
        height: 44px;
        font-size: 16px;
    }

    .ranking-info h4 {
        font-size: 14px;
    }

    .ranking-points {
        font-size: 20px;
    }

    .lesson-list {
        gap: 12px;
    }

    .lesson-item {
        padding: 14px;
        border-radius: 12px;
        flex-direction: column;
    }

    .lesson-date-badge {
        width: 50px;
        height: 50px;
        border-radius: 10px;
    }

    .lesson-date-badge .month {
        font-size: 10px;
    }

    .lesson-date-badge .day {
        font-size: 20px;
    }

    .lesson-info h4 {
        font-size: 14px;
    }

    .lesson-meta {
        flex-wrap: wrap;
        gap: 8px;
    }

    .calendar-container {
        border-radius: 12px;
        font-size: 13px;
    }

    .calendar-header {
        padding: 14px 16px;
    }

    .calendar-title {
        font-size: 16px;
    }

    .calendar-weekday {
        padding: 8px 4px;
        font-size: 11px;
    }

    .calendar-day {
        min-height: 55px;
        padding: 3px;
    }

    .day-number {
        font-size: 12px;
        margin-bottom: 2px;
    }

    .day-event {
        font-size: 9px;
        padding: 1px 3px;
        border-radius: 3px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .modal-overlay {
        padding: 0;
        align-items: flex-end;
    }

    .modal-overlay.show {
        display: flex;
    }

    .modal {
        width: 100%;
        max-width: 100%;
        max-height: 90vh;
        border-radius: 20px 20px 0 0;
        margin: 0;
        animation: modalSlideUp 0.3s ease;
    }

    @keyframes modalSlideUp {
        from { transform: translateY(100%); }
        to { transform: translateY(0); }
    }

    .modal-header {
        padding: 16px 20px;
        position: sticky;
        top: 0;
        background: var(--bg-card);
        z-index: 1;
    }

    .modal-title {
        font-size: 17px;
    }

    .modal-body {
        padding: 16px 20px;
        padding-bottom: calc(20px + env(safe-area-inset-bottom));
        max-height: calc(90vh - 130px);
        overflow-y: auto;
    }

    .modal-footer {
        padding: 12px 20px;
        padding-bottom: calc(12px + env(safe-area-inset-bottom));
        position: sticky;
        bottom: 0;
        background: var(--bg-card);
        border-top: 1px solid var(--border);
        flex-direction: column;
        gap: 10px;
    }

    .modal-footer .btn {
        width: 100%;
        padding: 14px;
        font-size: 15px;
        border-radius: 10px;
    }

    .form-group {
        margin-bottom: 16px;
    }

    .form-label {
        font-size: 14px;
        margin-bottom: 8px;
        font-weight: 500;
    }

    .form-input,
    .form-select,
    .form-textarea {
        padding: 12px 14px;
        font-size: 15px;
        border-radius: 10px;
    }

    .form-textarea {
        min-height: 80px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .btn {
        padding: 12px 16px;
        font-size: 14px;
        border-radius: 10px;
        font-weight: 500;
    }

    .btn-sm {
        padding: 8px 12px;
        font-size: 13px;
    }

    .btn-xs {
        padding: 6px 10px;
        font-size: 12px;
    }

    .btn-lg {
        padding: 16px 24px;
        font-size: 16px;
    }

    .empty-state {
        padding: 40px 20px;
    }

    .empty-state span {
        font-size: 56px;
    }

    .empty-state h3 {
        font-size: 16px;
    }

    .tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .tabs::-webkit-scrollbar {
        display: none;
    }

    .tab {
        padding: 10px 16px;
        font-size: 14px;
        white-space: nowrap;
    }

    .schedule-grid {
        grid-template-columns: 1fr;
    }

    .schedule-day-header {
        padding: 12px 14px;
        font-size: 15px;
        border-radius: 10px 10px 0 0;
    }

    .schedule-day-content {
        padding: 10px;
        min-height: auto;
    }

    .schedule-item {
        padding: 12px;
        margin-bottom: 8px;
        border-radius: 10px;
        border-left: 4px solid var(--primary);
    }

    .schedule-time {
        font-size: 13px;
    }

    .schedule-name {
        font-size: 15px;
    }

    .schedule-actions {
        opacity: 1;
        position: relative;
        top: auto;
        right: auto;
        flex-direction: row;
        margin-top: 8px;
        justify-content: flex-end;
    }

    .rule-item {
        padding: 14px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .rule-info {
        width: 100%;
    }

    .rule-info h4 {
        font-size: 14px;
    }

    .rule-info p {
        font-size: 12px;
        color: var(--text-secondary);
        margin-top: 4px;
    }

    .rule-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .student-detail-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 16px;
    }

    .student-detail-avatar {
        width: 100px;
        height: 100px;
        font-size: 40px;
    }

    .student-detail-grid {
        grid-template-columns: 1fr;
    }

    .avatar-upload {
        flex-direction: column;
        align-items: center;
    }

    .avatar-preview {
        width: 100px;
        height: 100px;
        font-size: 40px;
    }

    .points-badge {
        padding: 6px 14px;
        font-size: 14px;
    }

    .student-selector {
        border-radius: 12px;
    }

    .student-selector-toolbar {
        flex-direction: column;
        gap: 10px;
    }

    .student-selector-toolbar .form-input {
        width: 100%;
        padding: 12px;
        font-size: 14px;
    }

    .quick-actions {
        flex-wrap: wrap;
        justify-content: center;
    }

    .student-selector-group-header {
        padding: 12px 14px;
    }

    .group-name {
        font-size: 14px;
    }

    .student-selector-item {
        padding: 12px 14px;
    }

    .student-selector-item input[type="checkbox"] {
        width: 22px;
        height: 22px;
    }

    .student-name-text {
        font-size: 14px;
    }

    .student-tag-small {
        display: none;
    }

    .chart-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
        margin-bottom: 16px;
    }

    .chart-label {
        width: 100%;
        font-size: 13px;
    }

    .chart-bar-container {
        width: 100%;
        height: 28px;
    }

    .status-badge {
        padding: 6px 12px;
        font-size: 12px;
        border-radius: 20px;
    }

    .search-input {
        width: 100%;
        padding: 12px 14px;
        font-size: 14px;
        border-radius: 10px;
    }

    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

/* ============ 工具类 ============ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-secondary); }
.text-primary { color: var(--primary); }
.text-success { color: var(--secondary); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--accent); }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

.flex { display: flex; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 16px; }

/* ============ 课程记录卡片 ============ */
.lesson-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.lesson-item {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: var(--transition);
}

.lesson-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-lg);
}

.lesson-date-badge {
    width: 60px;
    height: 60px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.lesson-date-badge .month {
    font-size: 11px;
    text-transform: uppercase;
}

.lesson-date-badge .day {
    font-size: 24px;
    font-weight: 700;
}

.lesson-info {
    flex: 1;
}

.lesson-info h4 {
    font-size: 16px;
    margin-bottom: 4px;
}

.lesson-info p {
    font-size: 13px;
    color: var(--text-secondary);
}

.lesson-meta {
    display: flex;
    gap: 16px;
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.lesson-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ============ 学生选择器（简化版） ============ */
.student-selector {
    max-height: 350px;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
}

.student-selector-toolbar {
    padding: 12px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-main);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.student-selector-toolbar .form-input {
    margin-bottom: 0;
}

.quick-actions {
    display: flex;
    gap: 8px;
}

.student-selector-list {
    flex: 1;
    overflow-y: auto;
    max-height: 250px;
}

.student-selector-group {
    border-bottom: 1px solid var(--border);
}

.student-selector-group:last-child {
    border-bottom: none;
}

.student-selector-group-header {
    display: flex;
    align-items: center;
    padding: 10px 14px;
    background: var(--bg-main);
    cursor: pointer;
    gap: 8px;
}

.student-selector-group-header:hover {
    background: var(--border);
}

.group-toggle {
    font-size: 10px;
    color: var(--text-secondary);
    width: 16px;
}

.group-name {
    flex: 1;
    font-weight: 500;
    font-size: 13px;
}

.student-selector-group-content {
    padding: 4px 0;
}

.student-selector-item {
    display: flex;
    align-items: center;
    padding: 8px 14px;
    cursor: pointer;
    transition: var(--transition);
}

.student-selector-item:hover {
    background: rgba(79, 70, 229, 0.05);
}

.student-selector-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 10px;
    cursor: pointer;
}

.student-selector-item label {
    display: flex;
    align-items: center;
    flex: 1;
    cursor: pointer;
    gap: 8px;
}

.student-avatar-small {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    overflow: hidden;
}

.student-avatar-small img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.student-name-text {
    font-size: 14px;
    flex: 1;
}

.student-tag-small {
    font-size: 11px;
    padding: 2px 6px;
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
    border-radius: 10px;
    white-space: nowrap;
}

.student-selector-footer {
    padding: 10px 14px;
    border-top: 1px solid var(--border);
    background: var(--bg-main);
    font-size: 13px;
    color: var(--text-secondary);
    text-align: center;
}

.btn-xs {
    padding: 4px 8px;
    font-size: 11px;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

/* ============ 图表容器 ============ */
.chart-container {
    padding: 20px;
}

.chart-bar {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}

.chart-label {
    width: 140px;
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.chart-bar-container {
    flex: 1;
    height: 24px;
    background: var(--bg-main);
    border-radius: 4px;
    overflow: hidden;
}

.chart-bar-fill {
    height: 100%;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 8px;
    font-size: 12px;
    color: #fff;
    font-weight: 500;
}

/* ============ 规范样式 ============ */
.rule-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    gap: 16px;
}

.rule-item:last-child {
    border-bottom: none;
}

.rule-info {
    flex: 1;
}

.rule-info h4 {
    font-size: 15px;
    margin-bottom: 4px;
}

.rule-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.points-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}

.points-badge.positive {
    background: rgba(16, 185, 129, 0.15);
    color: var(--secondary);
}

.points-badge.negative {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

/* ============ 排行样式 ============ */
.ranking-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ranking-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-main);
    border-radius: var(--radius);
    transition: var(--transition);
}

.ranking-item:hover {
    background: var(--border);
}

.ranking-position {
    font-size: 24px;
    width: 40px;
    text-align: center;
}

.ranking-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 600;
    overflow: hidden;
}

.ranking-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ranking-info {
    flex: 1;
}

.ranking-info h4 {
    font-size: 16px;
    margin-bottom: 2px;
}

.ranking-points {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.ranking-points span {
    font-size: 14px;
    font-weight: 400;
}

.ranking-points.positive {
    color: var(--secondary);
}

.ranking-points.negative {
    color: var(--danger);
}

/* ============ 课程安排样式 ============ */
.week-schedule {
    overflow-x: auto;
}

.schedule-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(150px, 1fr));
    gap: 1px;
    background: var(--border);
    overflow-x: auto;
}

.schedule-day {
    background: var(--bg-card);
}

.schedule-day-header {
    padding: 12px;
    text-align: center;
    font-weight: 600;
    background: var(--bg-main);
    border-bottom: 2px solid var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.schedule-day-content {
    padding: 8px;
    min-height: 200px;
}

.schedule-item {
    padding: 12px;
    margin-bottom: 8px;
    background: var(--bg-main);
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
    position: relative;
}

.schedule-actions {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s;
}

.schedule-item:hover .schedule-actions {
    opacity: 1;
}

.btn-action {
    background: none;
    border: none;
    cursor: pointer;
    padding: 2px 6px;
    font-size: 12px;
    border-radius: 4px;
    transition: background 0.2s;
}

.btn-action:hover {
    background: rgba(0,0,0,0.1);
}

.schedule-time {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.schedule-name {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 4px;
}

.schedule-location,
.schedule-teacher {
    font-size: 11px;
}

/* ============ 学生详情样式 ============ */
.student-detail-header {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.student-detail-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--bg-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--text-secondary);
    overflow: hidden;
    flex-shrink: 0;
}

.student-detail-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.student-detail-info {
    flex: 1;
}

.student-detail-info h2 {
    font-size: 24px;
    margin-bottom: 4px;
}

.student-detail-info p {
    color: var(--text-secondary);
    font-size: 14px;
}

.student-detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 20px;
}

.detail-item {
    padding: 12px;
    background: var(--bg-main);
    border-radius: var(--radius);
}

.detail-item label {
    font-size: 12px;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 4px;
}

.detail-item p {
    font-size: 14px;
}

.detail-section {
    margin-bottom: 16px;
}

.detail-section h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.detail-section p {
    padding: 12px;
    background: var(--bg-main);
    border-radius: var(--radius);
    font-size: 14px;
}

/* ============ 学生选择器增强样式 ============ */
.student-selector-toolbar {
    display: flex;
    gap: 12px;
    padding: 12px;
    background: var(--bg-main);
    border-bottom: 1px solid var(--border);
}

.student-selector-toolbar input {
    flex: 1;
}

.quick-actions {
    display: flex;
    gap: 8px;
}

.student-selector-list {
    max-height: 300px;
    overflow-y: auto;
}

.student-selector-group {
    border-bottom: 1px solid var(--border);
}

.student-selector-group:last-child {
    border-bottom: none;
}

.student-selector-group-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: var(--bg-main);
    cursor: pointer;
    transition: var(--transition);
}

.student-selector-group-header:hover {
    background: var(--border);
}

.group-toggle {
    font-size: 10px;
    color: var(--text-secondary);
}

.group-name {
    flex: 1;
    font-size: 13px;
    font-weight: 500;
}

.student-selector-group-content {
    padding: 8px 0;
}

.student-selector-group-content {
    display: block;
}

.student-selector-group-content[style*="none"] {
    display: none;
}

.student-selector-item label {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    cursor: pointer;
}

.student-avatar-small {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    overflow: hidden;
}

.student-avatar-small img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.student-name-text {
    flex: 1;
    font-size: 13px;
}

.student-tag-small {
    font-size: 10px;
    padding: 2px 6px;
    background: var(--bg-main);
    border-radius: 4px;
    color: var(--text-secondary);
}

.student-selector-footer {
    padding: 10px 14px;
    background: var(--bg-main);
    border-top: 1px solid var(--border);
    font-size: 12px;
    color: var(--text-secondary);
}

.btn-xs {
    padding: 2px 8px;
    font-size: 11px;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

.btn-outline:hover {
    background: var(--border);
}

/* ============ 移动端遮罩层 ============ */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
}

.sidebar-overlay.show {
    display: block;
}

/* ============ 移动端响应式布局（768px以下） ============ */
@media screen and (max-width: 768px) {
    /* 顶部导航 */
    .mobile-header {
        display: flex;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    }

    .mobile-menu-btn {
        width: 44px;
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 8px;
        transition: background 0.2s;
    }

    .mobile-menu-btn:active {
        background: rgba(255, 255, 255, 0.1);
    }

    .mobile-title {
        font-size: 17px;
        font-weight: 600;
        flex: 1;
        text-align: center;
    }

    /* 侧边栏 */
    .sidebar {
        width: 280px;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3);
    }

    .sidebar-nav {
        padding: 12px 0;
    }

    .nav-item {
        padding: 16px 20px;
        font-size: 15px;
        gap: 14px;
    }

    .nav-item span:first-child {
        font-size: 22px;
    }

    .nav-item.active {
        background: linear-gradient(90deg, var(--primary), var(--primary-light));
    }

    /* 主内容区 */
    .main-content {
        padding: 16px;
        padding-top: 66px;
        padding-bottom: 20px;
    }

    /* 页面标题 */
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        margin-bottom: 20px;
    }

    .page-title {
        font-size: 22px;
    }

    .page-header .btn {
        width: 100%;
        padding: 14px 20px;
        font-size: 15px;
        border-radius: 10px;
    }

    /* 统计卡片 */
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        margin-bottom: 20px;
    }

    .stat-card {
        padding: 16px;
        border-radius: 12px;
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }

    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 22px;
    }

    .stat-info h3 {
        font-size: 24px;
    }

    .stat-info p {
        font-size: 12px;
    }

    /* 卡片 */
    .card {
        padding: 16px;
        border-radius: 12px;
        margin-bottom: 16px;
    }

    .card-header {
        margin-bottom: 14px;
    }

    .card-title {
        font-size: 15px;
    }

    /* 表格 */
    .table th,
    .table td {
        padding: 10px 8px;
        font-size: 13px;
    }

    .table-actions {
        flex-direction: column;
        gap: 4px;
    }

    .table-actions .btn {
        padding: 6px 10px;
        font-size: 12px;
    }

    /* 学生网格 */
    .students-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }

    .student-card {
        padding: 12px 8px;
        border-radius: 12px;
        cursor: pointer;
    }

    .student-avatar {
        width: 44px;
        height: 44px;
        font-size: 18px;
    }

    .student-name {
        font-size: 13px;
        margin-top: 6px;
    }

    .student-grade {
        font-size: 10px;
    }

    /* 排行列表 */
    .ranking-list {
        gap: 10px;
    }

    .ranking-item {
        padding: 14px 12px;
        border-radius: 12px;
    }

    .ranking-position {
        font-size: 20px;
        width: 32px;
    }

    .ranking-avatar {
        width: 44px;
        height: 44px;
        font-size: 16px;
    }

    .ranking-info h4 {
        font-size: 14px;
    }

    .ranking-points {
        font-size: 20px;
    }

    /* 课程记录列表 */
    .lesson-list {
        gap: 12px;
    }

    .lesson-item {
        padding: 14px;
        border-radius: 12px;
        flex-direction: column;
    }

    .lesson-date-badge {
        width: 50px;
        height: 50px;
        border-radius: 10px;
    }

    .lesson-date-badge .month {
        font-size: 10px;
    }

    .lesson-date-badge .day {
        font-size: 20px;
    }

    .lesson-info h4 {
        font-size: 14px;
    }

    .lesson-meta {
        flex-wrap: wrap;
        gap: 8px;
    }

    /* 日历 */
    .calendar-container {
        border-radius: 12px;
        font-size: 13px;
    }

    .calendar-header {
        padding: 14px 16px;
    }

    .calendar-title {
        font-size: 16px;
    }

    .calendar-weekday {
        padding: 8px 4px;
        font-size: 11px;
    }

    .calendar-day {
        min-height: 55px;
        padding: 3px;
    }

    .day-number {
        font-size: 12px;
        margin-bottom: 2px;
    }

    .day-event {
        font-size: 9px;
        padding: 1px 3px;
        border-radius: 3px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    /* 模态框 - 底部弹出 */
    .modal-overlay {
        padding: 0;
        align-items: flex-end;
    }

    .modal-overlay.show {
        display: flex;
    }

    .modal {
        width: 100%;
        max-width: 100%;
        max-height: 90vh;
        border-radius: 20px 20px 0 0;
        margin: 0;
        animation: modalSlideUp 0.3s ease;
    }

    @keyframes modalSlideUp {
        from { transform: translateY(100%); }
        to { transform: translateY(0); }
    }

    .modal-header {
        padding: 16px 20px;
        position: sticky;
        top: 0;
        background: var(--bg-card);
        z-index: 1;
    }

    .modal-title {
        font-size: 17px;
    }

    .modal-body {
        padding: 16px 20px;
        padding-bottom: calc(20px + env(safe-area-inset-bottom));
        max-height: calc(90vh - 130px);
        overflow-y: auto;
    }

    .modal-footer {
        padding: 12px 20px;
        padding-bottom: calc(12px + env(safe-area-inset-bottom));
        position: sticky;
        bottom: 0;
        background: var(--bg-card);
        border-top: 1px solid var(--border);
        flex-direction: column;
        gap: 10px;
    }

    .modal-footer .btn {
        width: 100%;
        padding: 14px;
        font-size: 15px;
        border-radius: 10px;
    }

    /* 表单 */
    .form-group {
        margin-bottom: 16px;
    }

    .form-label {
        font-size: 14px;
        margin-bottom: 8px;
        font-weight: 500;
    }

    .form-input,
    .form-select,
    .form-textarea {
        padding: 12px 14px;
        font-size: 15px;
        border-radius: 10px;
    }

    .form-textarea {
        min-height: 80px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    /* 按钮 */
    .btn {
        padding: 12px 16px;
        font-size: 14px;
        border-radius: 10px;
        font-weight: 500;
    }

    .btn-sm {
        padding: 8px 12px;
        font-size: 13px;
    }

    .btn-xs {
        padding: 6px 10px;
        font-size: 12px;
    }

    .btn-lg {
        padding: 16px 24px;
        font-size: 16px;
    }

    /* 空状态 */
    .empty-state {
        padding: 40px 20px;
    }

    .empty-state span {
        font-size: 56px;
    }

    .empty-state h3 {
        font-size: 16px;
    }

    /* 标签页 */
    .tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .tabs::-webkit-scrollbar {
        display: none;
    }

    .tab {
        padding: 10px 16px;
        font-size: 14px;
        white-space: nowrap;
    }

    /* 课程表 - 单列卡片 */
    .schedule-grid {
        grid-template-columns: 1fr;
    }

    .schedule-day-header {
        padding: 12px 14px;
        font-size: 15px;
        border-radius: 10px 10px 0 0;
    }

    .schedule-day-content {
        padding: 10px;
        min-height: auto;
    }

    .schedule-item {
        padding: 12px;
        margin-bottom: 8px;
        border-radius: 10px;
        border-left: 4px solid var(--primary);
    }

    .schedule-time {
        font-size: 13px;
    }

    .schedule-name {
        font-size: 15px;
    }

    .schedule-actions {
        opacity: 1;
        position: relative;
        top: auto;
        right: auto;
        flex-direction: row;
        margin-top: 8px;
        justify-content: flex-end;
    }

    /* 规范列表 */
    .rule-item {
        padding: 14px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .rule-info {
        width: 100%;
    }

    .rule-info h4 {
        font-size: 14px;
    }

    .rule-info p {
        font-size: 12px;
        color: var(--text-secondary);
        margin-top: 4px;
    }

    .rule-actions {
        width: 100%;
        justify-content: flex-end;
    }

    /* 学生详情 */
    .student-detail-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 16px;
    }

    .student-detail-avatar {
        width: 100px;
        height: 100px;
        font-size: 40px;
    }

    .student-detail-grid {
        grid-template-columns: 1fr;
    }

    /* 头像上传 */
    .avatar-upload {
        flex-direction: column;
        align-items: center;
    }

    .avatar-preview {
        width: 100px;
        height: 100px;
        font-size: 40px;
    }

    /* 积分徽章 */
    .points-badge {
        padding: 6px 14px;
        font-size: 14px;
    }

    /* 学生选择器 */
    .student-selector {
        border-radius: 12px;
    }

    .student-selector-toolbar {
        flex-direction: column;
        gap: 10px;
    }

    .student-selector-toolbar .form-input {
        width: 100%;
        padding: 12px;
        font-size: 14px;
    }

    .quick-actions {
        flex-wrap: wrap;
        justify-content: center;
    }

    .student-selector-group-header {
        padding: 12px 14px;
    }

    .group-name {
        font-size: 14px;
    }

    .student-selector-item {
        padding: 12px 14px;
    }

    .student-selector-item input[type="checkbox"] {
        width: 22px;
        height: 22px;
    }

    .student-name-text {
        font-size: 14px;
    }

    .student-tag-small {
        display: none;
    }

    /* 图表 */
    .chart-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
        margin-bottom: 16px;
    }

    .chart-label {
        width: 100%;
        font-size: 13px;
    }

    .chart-bar-container {
        width: 100%;
        height: 28px;
    }

    /* 状态徽章 */
    .status-badge {
        padding: 6px 12px;
        font-size: 12px;
        border-radius: 20px;
    }

    /* 搜索框 */
    .search-input {
        width: 100%;
        padding: 12px 14px;
        font-size: 14px;
        border-radius: 10px;
    }

    /* 表格滚动 */
    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

/* ============ 超小屏幕（480px以下） ============ */
@media screen and (max-width: 480px) {
    .page-title {
        font-size: 20px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .calendar-day {
        min-height: 50px;
    }

    .students-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .student-avatar {
        width: 38px;
        height: 38px;
        font-size: 16px;
    }

    .student-name {
        font-size: 12px;
    }

    .student-tag-small {
        display: none;
    }

    .schedule-item {
        padding: 10px;
    }

    .sidebar {
        width: 260px;
    }

    .card {
        padding: 12px;
        margin-bottom: 12px;
    }

    .form-group {
        margin-bottom: 12px;
    }

    .schedule-actions {
        opacity: 1;
    }
}
    
    .student-name {
        font-size: 12px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        flex-direction: row;
        text-align: left;
    }
}

/* ============ 分页样式 ============ */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 16px 0;
    gap: 8px;
    flex-wrap: wrap;
}

.pagination-info {
    color: var(--text-secondary);
    font-size: 14px;
    margin-right: 8px;
}

.pagination-buttons {
    display: flex;
    align-items: center;
    gap: 4px;
}

.pagination .btn {
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    font-size: 14px;
    border-radius: var(--radius);
}

.pagination .btn-primary {
    background: var(--primary);
    color: white;
    border: none;
}

.pagination-ellipsis {
    color: var(--text-secondary);
    padding: 0 4px;
}

@media (max-width: 768px) {
    .pagination {
        gap: 4px;
    }
    
    .pagination .btn {
        min-width: 32px;
        height: 32px;
        padding: 0 8px;
        font-size: 12px;
    }
}