/* ============================================
   响应式样式 - 移动端适配
   ============================================ */

/* 平板设备 (768px - 1024px) */
@media screen and (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    
    .profile-image {
        flex: 0 0 auto;
        margin: 0 auto;
    }
    
    .hero-text {
        text-align: center;
    }
    
    .hero-links {
        justify-content: center;
    }
    
    .publication-grid,
    .areas-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    
    .timeline-year {
        position: static;
        display: inline-block;
        margin-bottom: var(--spacing-xs);
        font-weight: 600;
        color: var(--color-primary);
    }
    
    .timeline-item {
        padding-left: var(--spacing-lg);
    }
    
    .timeline::before {
        left: 0;
    }
    
    .timeline-item::before {
        left: -8px;
    }
}

/* 移动设备 (< 768px) */
@media screen and (max-width: 768px) {
    :root {
        --font-size-h1: 2rem;
        --font-size-h2: 1.75rem;
        --font-size-h3: 1.25rem;
        --spacing-xl: 2rem;
        --spacing-xxl: 3rem;
    }
    
    /* 导航栏 */
    .nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 60px);
        background-color: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
        gap: 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid var(--color-border-light);
    }
    
    .nav-menu a {
        display: block;
        padding: var(--spacing-md);
        width: 100%;
    }
    
    /* 移动端语言切换器 */
    .lang-switcher {
        border-left: none;
        border-top: 1px solid var(--color-border-light);
        padding-left: 0;
        padding-top: var(--spacing-md);
        margin-left: 0;
        margin-top: var(--spacing-sm);
        justify-content: center;
        width: 100%;
    }
    
    .lang-btn {
        flex: 1;
        max-width: 80px;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    /* 主内容 */
    main {
        padding-top: 60px;
    }
    
    /* 页面标题 */
    .page-header {
        padding: var(--spacing-xl) 0;
    }
    
    .page-header h1 {
        font-size: 1.75rem;
    }
    
    .page-subtitle {
        font-size: var(--font-size-base);
    }
    
    /* 英雄区域 */
    .hero {
        padding: var(--spacing-xl) 0;
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .profile-image {
        flex: 0 0 200px;
    }
    
    .profile-image img {
        width: 200px;
        height: 200px;
    }
    
    .hero-links {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-links .btn {
        width: 100%;
    }
    
    /* 网格布局 */
    .publication-grid,
    .areas-grid,
    .contact-grid,
    .links-grid {
        grid-template-columns: 1fr;
    }
    
    .methods-grid {
        grid-template-columns: 1fr;
    }
    
    /* 时间线 */
    .timeline {
        padding-left: var(--spacing-md);
    }
    
    .timeline-item {
        padding-left: var(--spacing-md);
    }
    
    .timeline-year {
        position: static;
        display: block;
        margin-bottom: var(--spacing-sm);
        font-weight: 600;
        color: var(--color-primary);
    }
    
    /* 卡片 */
    .publication-card,
    .area-card,
    .contact-card,
    .link-card {
        padding: var(--spacing-md);
    }
    
    .publication-year {
        position: static;
        display: inline-block;
        margin-bottom: var(--spacing-sm);
    }
    
    .publication-card h3 {
        padding-right: 0;
    }
    
    /* 列表项 */
    .teaching-item,
    .mentoring-item,
    .award-item,
    .service-item,
    .presentation-item,
    .media-item {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .teaching-term,
    .mentoring-year,
    .award-year,
    .service-year,
    .presentation-year,
    .media-date {
        flex: 0 0 auto;
    }
    
    /* 页脚 */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-section {
        margin-bottom: var(--spacing-md);
    }
    
    /* 表单 */
    .contact-form {
        padding: var(--spacing-lg);
    }
    
    /* 按钮 */
    .btn {
        width: 100%;
        padding: var(--spacing-md);
    }
    
    /* 文本 */
    .about-content p {
        font-size: var(--font-size-base);
    }
}

/* 小屏幕移动设备 (< 480px) */
@media screen and (max-width: 480px) {
    :root {
        --font-size-h1: 1.75rem;
        --font-size-h2: 1.5rem;
        --font-size-h3: 1.1rem;
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-text h1 {
        font-size: 1.75rem;
    }
    
    .profile-image {
        flex: 0 0 150px;
    }
    
    .profile-image img {
        width: 150px;
        height: 150px;
    }
    
    .publication-card,
    .area-card,
    .contact-card,
    .link-card {
        padding: var(--spacing-sm);
    }
    
    .page-header {
        padding: var(--spacing-lg) 0;
    }
    
    .contact-form {
        padding: var(--spacing-md);
    }
}

/* 打印样式优化 */
@media print {
    .navbar,
    .footer,
    .nav-toggle,
    .hero-links,
    .section-footer,
    .btn {
        display: none;
    }
    
    main {
        padding-top: 0;
    }
    
    .page-header {
        background: none;
        color: var(--color-text);
        padding: var(--spacing-md) 0;
    }
    
    .page-header h1 {
        color: var(--color-text);
    }
    
    .publication-card,
    .area-card,
    .contact-card {
        box-shadow: none;
        border: 1px solid var(--color-border);
        page-break-inside: avoid;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --color-border: #000000;
        --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

/* 减少动画模式支持 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}