/* 移动端优化样式 */

/* 基础移动端设置 */
@media (max-width: 768px) {
    /* 全局设置 */
    body {
        font-size: 14px;
        line-height: 1.4;
        -webkit-text-size-adjust: 100%;
        -ms-text-size-adjust: 100%;
        text-size-adjust: 100%;
    }

    /* 容器和布局 */
    .container, .main-container {
        padding: 10px;
        margin: 0;
        width: 100%;
        box-sizing: border-box;
    }

    /* 登录页面优化 */
    .login-section {
        margin: 10px;
        padding: 10px;
        max-width: none;
    }

    .login-card {
        padding: 20px;
        margin: 0;
        border-radius: 10px;
    }

    .login-card h2 {
        font-size: 20px;
        margin-bottom: 20px;
    }

    .form-group {
        margin-bottom: 15px;
    }

    .form-group input {
        padding: 14px 12px;
        font-size: 16px; /* 防止iOS缩放 */
        border-radius: 6px;
    }

    .btn {
        padding: 12px 20px;
        font-size: 16px;
        border-radius: 6px;
        width: 100%;
        margin-bottom: 10px;
    }

    /* 角色选择优化 */
    .role-selection {
        flex-direction: column;
        gap: 15px;
        padding: 20px 10px;
    }

    .role-card {
        width: 100%;
        max-width: none;
        padding: 20px;
        margin: 0;
    }

    .role-card h3 {
        font-size: 18px;
        margin-bottom: 10px;
    }

    .role-card p {
        font-size: 14px;
        margin-bottom: 15px;
    }

    /* 验证码优化 */
    .captcha-container {
        margin-bottom: 15px;
    }

    .captcha-display-container {
        flex-direction: column;
        gap: 10px;
        align-items: stretch;
    }

    .captcha-display {
        width: 100%;
        height: 50px;
        font-size: 18px;
    }

    .captcha-refresh-btn {
        width: 100%;
        padding: 10px;
        font-size: 14px;
    }

    /* 消息提示优化 */
    .message {
        margin: 10px;
        padding: 12px;
        font-size: 14px;
        border-radius: 6px;
    }
}

/* 教师页面移动端优化 */
@media (max-width: 768px) {
    .teacher-dashboard {
        padding: 10px;
    }

    .section-header {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        margin-bottom: 15px;
    }

    .section-header h2 {
        font-size: 18px;
        margin-bottom: 10px;
    }

    .header-actions {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .add-btn, .delete-all-btn {
        width: 100%;
        padding: 10px;
        font-size: 14px;
    }

    /* 单词网格优化 */
    .words-grid {
        grid-template-columns: 1fr;
        gap: 10px;
        margin: 10px 0;
    }

    .word-card {
        padding: 15px;
        border-radius: 8px;
    }

    .word-card h4 {
        font-size: 16px;
        margin-bottom: 8px;
    }

    .word-card p {
        font-size: 13px;
        margin-bottom: 6px;
    }

    .word-actions {
        flex-direction: column;
        gap: 6px;
        margin-top: 10px;
    }

    .word-actions button {
        width: 100%;
        padding: 8px;
        font-size: 13px;
    }

    /* 统计卡片优化 */
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 10px;
        margin: 15px 0;
    }

    .stat-card {
        padding: 15px;
        text-align: center;
    }

    .stat-card h3 {
        font-size: 16px;
        margin-bottom: 8px;
    }

    .stat-card .stat-number {
        font-size: 24px;
        font-weight: bold;
    }

    /* 模态框优化 */
    .modal {
        padding: 10px;
    }

    .modal-content {
        margin: 10px;
        max-width: calc(100vw - 20px);
        max-height: calc(100vh - 20px);
        overflow-y: auto;
        padding: 20px;
    }

    .modal-header {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        margin-bottom: 15px;
    }

    .modal-header h3 {
        font-size: 18px;
        margin-bottom: 0;
    }

    .close-btn {
        align-self: flex-end;
        font-size: 24px;
        padding: 5px;
    }

    .form-group {
        margin-bottom: 15px;
    }

    .form-group label {
        font-size: 14px;
        margin-bottom: 6px;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 12px;
        font-size: 16px;
        border-radius: 6px;
    }

    .form-row {
        flex-direction: column;
        gap: 15px;
    }

    /* 设置页面优化 */
    .settings-content {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .setting-item {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 15px;
    }

    .setting-item label {
        font-size: 14px;
        margin-bottom: 6px;
    }

    .setting-item select,
    .setting-item input {
        width: 100%;
        padding: 10px;
        font-size: 16px;
    }

    /* 用户管理优化 */
    .user-list {
        margin: 10px 0;
    }

    .user-item {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        padding: 15px;
        margin-bottom: 10px;
    }

    .user-info {
        flex-direction: column;
        gap: 5px;
    }

    .user-actions {
        flex-direction: column;
        gap: 8px;
    }

    .user-actions button {
        width: 100%;
        padding: 8px;
        font-size: 13px;
    }

    /* 导航优化 */
    .nav-tabs {
        flex-direction: column;
        gap: 5px;
        margin-bottom: 15px;
    }

    .nav-tab {
        width: 100%;
        padding: 12px;
        font-size: 14px;
        text-align: center;
    }

    /* 按钮组优化 */
    .btn-group {
        flex-direction: column;
        gap: 8px;
    }

    .btn-group button {
        width: 100%;
        padding: 10px;
        font-size: 14px;
    }
}

/* 学生页面移动端优化 */
@media (max-width: 768px) {
    .student-dashboard {
        padding: 10px;
    }

    .practice-section {
        padding: 15px;
    }

    .word-display {
        font-size: 24px;
        margin: 20px 0;
        padding: 20px;
    }

    .practice-controls {
        flex-direction: column;
        gap: 15px;
        margin: 20px 0;
    }

    .practice-controls button {
        width: 100%;
        padding: 15px 20px;
        font-size: 16px;
        min-height: 50px;
        display: flex;
        align-items: center;
        justify-content: center;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .input-group {
        flex-direction: column;
        gap: 10px;
    }

    .input-group input {
        width: 100%;
        padding: 12px;
        font-size: 16px;
    }

    .input-group button {
        width: 100%;
        padding: 12px;
        font-size: 16px;
    }

    /* 拼字练习优化 */
    .word-building-area {
        flex-direction: column;
        gap: 15px;
        padding: 15px;
    }

    .letters-container {
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
    }

    .letter-tile {
        min-width: 40px;
        min-height: 40px;
        font-size: 16px;
    }

    .word-zone {
        min-height: 60px;
        padding: 10px;
    }

    .word-zone .letter-tile {
        min-width: 35px;
        min-height: 35px;
        font-size: 14px;
    }

    /* 进度显示优化 */
    .progress-section {
        padding: 15px;
        margin: 10px 0;
    }

    .progress-item {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 12px;
        margin-bottom: 10px;
    }

    .progress-label {
        font-size: 14px;
        margin-bottom: 5px;
    }

    .progress-bar {
        height: 8px;
    }

    .progress-text {
        font-size: 12px;
    }
}

/* 超小屏幕优化 (手机竖屏) */
@media (max-width: 480px) {
    body {
        font-size: 13px;
    }

    .login-card {
        padding: 15px;
    }

    .login-card h2 {
        font-size: 18px;
    }

    .form-group input {
        padding: 12px 10px;
        font-size: 16px;
    }

    .btn {
        padding: 12px 15px;
        font-size: 15px;
    }

    .word-card {
        padding: 12px;
    }

    .word-card h4 {
        font-size: 15px;
    }

    .word-card p {
        font-size: 12px;
    }

    .modal-content {
        margin: 5px;
        max-width: calc(100vw - 10px);
        padding: 15px;
    }

    .modal-header h3 {
        font-size: 16px;
    }

    .setting-item {
        padding: 12px;
    }

    .user-item {
        padding: 12px;
    }

    .nav-tab {
        padding: 10px;
        font-size: 13px;
    }

    .word-display {
        font-size: 20px;
        padding: 15px;
    }

    .letter-tile {
        min-width: 35px;
        min-height: 35px;
        font-size: 14px;
    }

    .word-zone .letter-tile {
        min-width: 30px;
        min-height: 30px;
        font-size: 12px;
    }
}

/* 横屏优化 */
@media (max-width: 768px) and (orientation: landscape) {
    .login-section {
        margin: 5px;
        padding: 5px;
    }

    .login-card {
        padding: 15px;
    }

    .role-selection {
        flex-direction: row;
        gap: 10px;
        padding: 10px;
    }

    .role-card {
        flex: 1;
        padding: 15px;
    }

    .words-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .modal-content {
        max-height: calc(100vh - 10px);
    }
}

/* 触摸优化 */
@media (hover: none) and (pointer: coarse) {
    /* 增加触摸目标大小 */
    button, .btn, .nav-tab, .letter-tile {
        min-height: 44px;
        min-width: 44px;
    }

    /* 优化触摸反馈 */
    button:active, .btn:active, .nav-tab:active {
        transform: scale(0.95);
        transition: transform 0.1s ease;
    }

    /* 移除悬停效果 */
    button:hover, .btn:hover, .nav-tab:hover {
        transform: none;
    }

    /* 优化输入框 */
    input, select, textarea {
        -webkit-appearance: none;
        appearance: none;
        border-radius: 6px;
    }

    /* 优化滚动 */
    .modal-content, .words-grid, .user-list {
        -webkit-overflow-scrolling: touch;
    }
}

/* 高分辨率屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .word-card, .stat-card, .user-item {
        border-width: 0.5px;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    .login-card, .modal-content, .word-card, .stat-card, .user-item {
        background-color: #2d2d2d;
        color: #ffffff;
        border-color: #444444;
    }

    .form-group input, .form-group select, .form-group textarea {
        background-color: #3d3d3d;
        color: #ffffff;
        border-color: #555555;
    }

    .btn {
        background-color: #4CAF50;
        color: #ffffff;
    }

    .btn:hover {
        background-color: #45a049;
    }
}

/* 减少动画以节省电池 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}