/* 
 * 响应式设计样式文件
 * 适配移动设备和平板设备
 */

/* 平板设备 (768px - 1024px) */
@media screen and (max-width: 1024px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-features {
        gap: 2rem;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 1.5rem;
    }
    
    .teachers-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .process-steps {
        gap: 1.5rem;
    }
    
    .step:not(:last-child)::after {
        display: none;
    }
    
    .contact-content {
        gap: 3rem;
    }
}

/* 小平板设备 (768px) */
@media screen and (max-width: 768px) {
    /* 导航栏响应式 */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        width: 100%;
        text-align: center;
        transition: var(--transition-normal);
        box-shadow: var(--shadow-md);
        gap: 0;
        padding: 2rem 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-item {
        margin: 1rem 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    /* 主页内容 */
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-features {
        flex-direction: column;
        gap: 1.5rem;
        align-items: center;
    }
    
    .feature-item {
        flex-direction: row;
        gap: 1rem;
    }
    
    .feature-icon {
        margin-bottom: 0;
    }
    
    /* 章节标题 */
    .section-title {
        font-size: 2rem;
    }
    
    /* 优势网格 */
    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .advantage-card {
        padding: 2rem 1.5rem;
    }
    
    /* 师资团队 */
    .teachers-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    /* 课程标签 */
    .courses-tabs {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .tab-button {
        width: 200px;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    /* 服务流程 */
    .process-steps {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }
    
    .step {
        max-width: 300px;
    }
    
    /* 成功案例 */
    .cases-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    /* FAQ区域 */
    .faq {
        padding: 60px 0;
    }
    
    .faq-question {
        padding: 0.8rem 1rem;
    }
    
    .faq-question h3 {
        font-size: 0.9rem;
        line-height: 1.3;
    }
    
    .faq-item.active .faq-answer {
        padding: 0 1rem 1rem 1rem;
    }
    
    .faq-answer p {
        font-size: 0.85rem;
    }
    
    /* 联系我们 */
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .contact-item {
        padding: 1.5rem;
    }
    
    .contact-form {
        padding: 2rem;
    }
    
    /* 页脚 */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 1.5rem;
    }
    
    .qr-container {
        flex-direction: row;
        justify-content: center;
        gap: 2rem;
    }
}

/* 移动设备 (480px) */
@media screen and (max-width: 480px) {
    .container {
        padding: 0 10px;
    }
    
    .nav-container {
        padding: 0 15px;
    }
    
    .nav-logo h2 {
        font-size: 1.5rem;
    }
    
    /* 主页内容 */
    .hero {
        padding: 0 10px;
    }
    
    .hero-title {
        font-size: 2rem;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 2rem;
    }
    
    .hero-features {
        margin-bottom: 2rem;
    }
    
    .cta-button {
        padding: 0.8rem 2rem;
        font-size: 1rem;
    }
    
    /* 章节间距 */
    .advantages,
    .teachers,
    .courses,
    .process,
    .cases,
    .contact {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 1.8rem;
        margin-bottom: 0.5rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
        margin-bottom: 2rem;
    }
    
    /* 优势卡片 */
    .advantage-card {
        padding: 1.5rem;
    }
    
    .card-icon {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }
    
    .advantage-card h3 {
        font-size: 1.3rem;
    }
    
    /* 现代化图标适配 */
    .feature-icon,
    .card-icon {
        width: 50px;
        height: 50px;
    }
    
    .feature-icon svg,
    .card-icon svg {
        width: 25px;
        height: 25px;
    }
    
    /* 教师卡片 */
    .teacher-card {
        padding: 1.5rem;
    }
    
    .teacher-avatar {
        width: 100px;
        height: 100px;
        font-size: 2.5rem;
    }
    
    /* 课程标签 */
    .tab-button {
        width: 100%;
        padding: 0.8rem 1.5rem;
    }
    
    /* 流程步骤 */
    .step-number {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .step h3 {
        font-size: 1.2rem;
    }
    
    /* 案例卡片 */
    .case-card {
        padding: 2rem 1.5rem;
    }
    
    .case-card::before {
        font-size: 4rem;
    }
    
    .student-avatar {
        width: 40px;
        height: 40px;
    }
    
    /* 联系表单 */
    .contact-item {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .contact-icon {
        width: 50px;
        height: 50px;
    }
    
    .contact-icon svg {
        width: 25px;
        height: 25px;
    }
    
    /* 二维码区域 */
    .qr-container {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .qr-code {
        width: 60px;
        height: 60px;
    }
    
    .contact-form {
        padding: 1.5rem;
    }
    
    .contact-form input,
    .contact-form select,
    .contact-form textarea {
        padding: 0.8rem;
    }
    
    /* 返回顶部按钮 */
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 1.2rem;
    }
}

/* 超小设备 (320px) */
@media screen and (max-width: 320px) {
    .hero-title {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.6rem;
    }
    
    .advantage-card,
    .teacher-card,
    .case-card {
        padding: 1rem;
    }
    
    .contact-form {
        padding: 1rem;
    }
    
    .tab-button {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }
}

/* 横屏模式优化 */
@media screen and (max-height: 500px) and (orientation: landscape) {
    .hero {
        height: auto;
        min-height: 100vh;
        padding: 100px 0 50px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        margin-bottom: 2rem;
    }
    
    .hero-features {
        margin-bottom: 2rem;
    }
}

/* 高分辨率屏幕优化 */
@media screen and (min-width: 1200px) {
    .container {
        max-width: 1400px;
    }
    
    .hero-title {
        font-size: 4rem;
    }
    
    .hero-subtitle {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 3rem;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .teachers-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 超宽屏优化 */
@media screen and (min-width: 1600px) {
    .container {
        max-width: 1600px;
    }
    
    .teachers-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .cases-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 动画性能优化 - 减少动画 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --shadow-sm: 0 2px 4px rgba(0,0,0,0.3);
        --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
        --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    }
    
    .nav-link,
    .advantage-card,
    .teacher-card,
    .case-card {
        border: 1px solid var(--gray-400);
    }
}

/* 深色模式准备 */
@media (prefers-color-scheme: dark) {
    /* 可以在这里添加深色模式样式 */
}

/* 打印样式 */
@media print {
    .navbar,
    .hamburger,
    .back-to-top,
    .hero-animation {
        display: none !important;
    }
    
    .hero {
        height: auto;
        background: white !important;
        color: black !important;
    }
    
    .hero-content {
        color: black !important;
    }
    
    * {
        box-shadow: none !important;
        background: white !important;
        color: black !important;
    }
}