/* 组件特定样式 */

/* 特色卡片样式 */
.grid {
    display: flex;
    flex-wrap: nowrap;
    gap: 15px;
    margin-bottom: 40px;
    justify-content: space-between;
}

.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    padding: 20px 15px;
    transition: all 0.3s ease;
    text-align: center;
    border-bottom: 4px solid transparent;
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.card:nth-child(1) {
    border-bottom-color: #4FC0E8;
}

.card:nth-child(2) {
    border-bottom-color: #FFCE54;
}

.card:nth-child(3) {
    border-bottom-color: #A0D568;
}

.card:nth-child(4) {
    border-bottom-color: #FC6E51;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.icon {
    width: 40px;
    height: 40px;
    margin: 0 auto 10px;
}

.card-title {
    color: #7928CA;
    font-size: 16px;
    margin-top: 10px;
    margin-bottom: 10px;
}

.card p {
    font-size: 14px;
    line-height: 1.4;
}

/* AI编程教育主题导航栏 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    backdrop-filter: blur(20px);
    transition: var(--transition);
    border-bottom: 1px solid rgba(99, 102, 241, 0.1);
}

.navbar:hover {
    box-shadow: var(--shadow-md);
    border-bottom-color: rgba(99, 102, 241, 0.2);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--space-lg);
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.logo {
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    letter-spacing: -0.02em;
}

.logo::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--gradient-secondary);
    transition: width 0.4s ease;
    border-radius: 3px;
}

.logo:hover::after {
    width: 100%;
}

.logo-text {
    transition: color 0.3s ease;
}

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

.logo-highlight {
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 900;
    margin: 0 2px;
    padding: 0 3px;
    position: relative;
}

.nav-links {
    display: flex;
    gap: 5px;
    align-items: center;
}

.nav-link {
    color: #555;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 10px 15px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    position: relative;
}

.nav-icon {
    font-size: 14px;
    margin-right: 6px;
    opacity: 0.8;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-secondary);
    transition: var(--transition);
    transform: translateX(-50%);
    opacity: 0;
    border-radius: 2px;
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: rgba(121, 40, 202, 0.05);
    transform: translateY(-2px);
}

.nav-link:hover::after {
    width: 60%;
    opacity: 1;
}

.nav-cta {
    background: var(--gradient-secondary);
    color: white;
    padding: 12px 22px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(121, 40, 202, 0.3);
    transition: var(--transition);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    margin-left: 10px;
}

.nav-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: all 0.5s ease;
}

.nav-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 7px 20px rgba(121, 40, 202, 0.5);
}

.nav-cta:hover::before {
    left: 100%;
}

.arrow {
    margin-left: 8px;
    transition: transform 0.3s ease;
}

.nav-cta:hover .arrow {
    transform: translateX(4px);
}

/* 移动端菜单 */
.mobile-menu-trigger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    width: 40px;
    height: 40px;
    position: relative;
    z-index: 1001;
}

.mobile-menu-trigger span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--gradient-secondary);
    margin: 5px 0;
    border-radius: 3px;
    transition: var(--transition);
}

/* 覆盖层 */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    visibility: hidden;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 999;
}

.overlay.active {
    visibility: visible;
    opacity: 1;
}

/* 英雄区域样式 */
.hero-section {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    padding: clamp(4rem, 8vw, 6rem) var(--space-lg);
    text-align: center;
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--space-xl);
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-section::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    margin: 0;
    padding-bottom: var(--space-md);
    text-shadow: 0 4px 8px rgba(0,0,0,0.3);
    font-weight: 800;
    letter-spacing: -0.02em;
    position: relative;
    z-index: 2;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 3vw, 1.5rem);
    opacity: 0.95;
    max-width: 800px;
    margin: 0 auto var(--space-xl);
    line-height: 1.6;
    font-weight: 400;
    position: relative;
    z-index: 2;
}

.hero-cta {
    background: var(--bg-primary);
    color: var(--primary-color);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 700;
    font-size: 1.125rem;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
    border: 2px solid rgba(255,255,255,0.2);
}

.hero-cta:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-xl);
    background: rgba(255,255,255,0.95);
}

/* CTA区域样式 */
.cta-section {
    text-align: center;
    padding: 60px 30px;
    margin: 50px 0;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 15px 30px rgba(121, 40, 202, 0.3);
}

.cta-title {
    font-size: 32px;
    margin-bottom: 20px;
}

.cta-description {
    font-size: 18px;
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    padding: 18px 40px;
    background-color: white;
    color: var(--primary-color);
    font-weight: bold;
    text-decoration: none;
    border-radius: 50px;
    font-size: 18px;
    transition: var(--transition);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

/* 联系区域样式 */
.contact-section {
    text-align: center;
    padding: 40px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 40px;
}

.contact-title {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.qrcode-container {
    max-width: 550px;
    margin: 30px auto;
    padding: 15px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    border: 1px solid #eee;
}

.qrcode-img {
    width: 100%;
    border-radius: 8px;
}

/* AI编程课程目录样式 */
.courses-section {
    margin-bottom: var(--space-2xl);
    position: relative;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-xl);
    /* 确保网格项目有合适的宽高比 */
    align-items: start;
}

.course-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition-slow);
    display: flex;
    flex-direction: column;
    height: auto;
    max-height: 520px; /* 显著减少最大高度 */
    position: relative;
    border: 1px solid rgba(99, 102, 241, 0.1);
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.4s ease;
    z-index: 2;
}

.course-card:hover::before {
    transform: scaleX(1);
}

.course-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: rgba(99, 102, 241, 0.2);
}

.course-card:active {
    transform: translateY(-8px) scale(1.01);
    transition: var(--transition-fast);
}

/* 课程卡片加载动画 */
.course-card {
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
    transform: translateY(30px);
}

.course-card:nth-child(1) { animation-delay: 0.1s; }
.course-card:nth-child(2) { animation-delay: 0.2s; }
.course-card:nth-child(3) { animation-delay: 0.3s; }
.course-card:nth-child(4) { animation-delay: 0.4s; }
.course-card:nth-child(5) { animation-delay: 0.5s; }
.course-card:nth-child(6) { animation-delay: 0.6s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.course-image-container {
    height: 150px; /* 进一步减少图片容器高度 */
    overflow: hidden;
    position: relative;
    background: var(--gradient-secondary);
}

.course-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
    filter: brightness(0.9);
}

.course-card:hover .course-image {
    transform: scale(1.08);
    filter: brightness(1);
}

.course-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.2) 50%, rgba(6, 182, 212, 0.1) 100%);
    opacity: 0;
    transition: var(--transition);
}

.course-card:hover .course-overlay {
    opacity: 1;
}

.course-badge {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: var(--gradient-accent);
    color: var(--text-inverse);
    font-size: 0.75rem;
    font-weight: 700;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--border-radius-lg);
    z-index: 3;
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.course-content {
    padding: var(--space-md); /* 进一步减少内边距 */
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs); /* 进一步减少元素间距 */
}

.course-title {
    font-size: 1.1rem; /* 稍微减小字体 */
    font-weight: 700;
    margin-bottom: var(--space-xs); /* 减少下边距 */
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.25; /* 进一步减少行高 */
    height: auto;
    min-height: 2.5rem; /* 进一步减少最小高度 */
}

.course-description {
    color: var(--text-secondary);
    font-size: 0.85rem; /* 稍微减小字体 */
    line-height: 1.4; /* 进一步减少行高 */
    margin-bottom: var(--space-xs); /* 进一步减少下边距 */
    display: -webkit-box;
    -webkit-line-clamp: 2; /* 保持显示行数 */
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-grow: 0; /* 不让描述占用过多空间 */
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: var(--space-sm); /* 减少顶部内边距 */
    border-top: 1px solid rgba(99, 102, 241, 0.1);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.02), rgba(139, 92, 246, 0.02));
    margin: var(--space-sm) calc(-1 * var(--space-md)) calc(-1 * var(--space-md)); /* 调整边距 */
    padding: var(--space-sm) var(--space-md); /* 减少内边距 */
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

.course-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-xs); /* 进一步减少下边距 */
}

.course-tech-badge {
    padding: 0.25rem 0.5rem; /* 减少内边距 */
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--border-radius);
    font-size: 0.7rem; /* 稍微减小字体 */
    color: var(--primary-color);
    font-weight: 600;
    transition: var(--transition-fast);
}

.course-tech-badge:hover {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    transform: translateY(-1px);
}

.course-price {
    font-size: 1rem;
    color: var(--primary-color);
    font-weight: 700;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.course-rating {
    display: flex;
    align-items: center;
    font-size: 0.875rem;
    color: var(--warning-color);
    font-weight: 600;
}

.course-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-xs); /* 进一步减少下边距 */
    padding: 0.25rem 0; /* 进一步减少内边距 */
    border-bottom: 1px solid rgba(99, 102, 241, 0.1);
}

.course-stat {
    display: flex;
    align-items: center;
    font-size: 0.75rem; /* 稍微减小字体 */
    color: var(--text-secondary);
    font-weight: 500;
}

.course-stat svg {
    margin-right: 0.25rem; /* 减少图标间距 */
    opacity: 0.7;
}

/* 查看全部课程按钮 */
.view-all-courses {
    display: block;
    width: fit-content;
    margin: 40px auto 0;
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: var(--transition);
    text-align: center;
}

.view-all-courses:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(121, 40, 202, 0.2);
}

/* 会员价格样式 */
.pricing-cards {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 50px 0;
    flex-wrap: wrap;
}

.pricing-card {
    flex: 1;
    min-width: 300px;
    max-width: 400px;
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.card-standard {
    border-top: 5px solid #2980b9;
}

.card-premium {
    border-top: 5px solid var(--primary-color);
}

.card-header {
    padding: 30px;
    text-align: center;
    background-color: #f8f9fa;
}

.card-premium .card-header {
    background: var(--gradient-primary);
    color: white;
}

.card-title {
    font-size: 26px;
    font-weight: bold;
    margin-bottom: 5px;
}

.card-price {
    font-size: 48px;
    font-weight: bold;
    margin: 20px 0 5px;
}

.card-original-price {
    text-decoration: line-through;
    color: #999;
    font-size: 18px;
    margin-bottom: 10px;
    display: block;
}

.card-premium .card-original-price {
    color: rgba(255, 255, 255, 0.7);
}

.card-content {
    padding: 30px;
}

.card-feature-list {
    list-style-type: none;
    margin-bottom: 30px;
}

.card-feature-item {
    padding: 12px 0;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    align-items: center;
}

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

.card-feature-icon {
    color: var(--primary-color);
    margin-right: 15px;
    font-weight: bold;
}

.premium-label {
    position: absolute;
    top: 20px;
    right: -35px;
    transform: rotate(45deg);
    background-color: #e74c3c;
    color: white;
    font-size: 12px;
    font-weight: bold;
    padding: 5px 40px;
}

.card-button {
    display: block;
    text-align: center;
    padding: 16px;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    margin-top: 20px;
    transition: all 0.3s ease;
}

.standard-button {
    background-color: #2980b9;
}

.standard-button:hover {
    background-color: #2471a3;
}

.premium-button {
    background: var(--gradient-secondary);
    box-shadow: 0 5px 15px rgba(121, 40, 202, 0.3);
}

.premium-button:hover {
    box-shadow: 0 8px 25px rgba(121, 40, 202, 0.4);
}

/* 课程亮点样式 */
.feature-list {
    max-width: 900px;
    margin: 0 auto;
    list-style-type: none;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
    padding: 25px 30px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.feature-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 25px;
    color: white;
    font-weight: bold;
    font-size: 24px;
}

.feature-content {
    flex: 1;
}

.feature-title {
    font-weight: bold;
    font-size: 20px;
    margin-bottom: 10px;
    color: #333;
}

.feature-description {
    color: #666;
    font-size: 16px;
    line-height: 1.6;
}

/* 用户评价样式 */
.testimonials {
    max-width: 1000px;
    margin: 0 auto;
}

.testimonial {
    background: #FFF1F9;
    border-left: 4px solid var(--secondary-color);
    padding: 30px;
    margin-bottom: 30px;
    font-style: italic;
    border-radius: 0 12px 12px 0;
    box-shadow: 0 5px 15px rgba(255, 0, 128, 0.1);
    position: relative;
}

.testimonial::before {
    content: """;
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 60px;
    color: rgba(255, 0, 128, 0.1);
    font-family: Georgia, serif;
}

.testimonial-content {
    position: relative;
    z-index: 1;
    font-size: 16px;
    padding-left: 20px;
    line-height: 1.8;
}

/* FAQ样式 */
.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 20px;
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

.faq-question {
    font-weight: bold;
    margin-bottom: 15px;
    color: var(--primary-color);
    font-size: 18px;
}

.faq-answer {
    line-height: 1.7;
    color: #555;
}

/* AI主题响应式课程网格 */
@media (max-width: 1200px) {
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
        gap: var(--space-md);
    }

    .course-card {
        max-height: 480px; /* 显著减少高度 */
    }
}

@media (max-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: var(--space-md);
    }

    .course-content {
        padding: var(--space-sm);
    }

    .course-card {
        max-height: 450px; /* 进一步减少高度 */
    }

    .course-image-container {
        height: 130px; /* 减少图片高度 */
    }
}

@media (max-width: 900px) {
    .grid {
        flex-wrap: wrap;
    }

    .card {
        min-width: 45%;
    }
}

@media (max-width: 768px) {
    .pricing-cards {
        flex-direction: column;
        align-items: center;
    }

    .pricing-card {
        width: 100%;
    }

    .courses-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: var(--space-sm);
    }

    .course-card {
        max-width: 100%;
        max-height: 400px; /* 移动端显著减少高度 */
    }

    .course-image-container {
        height: 120px; /* 移动端大幅减少图片高度 */
    }

    .course-content {
        padding: var(--space-xs) var(--space-sm);
    }

    .course-title {
        font-size: 0.95rem; /* 移动端减小标题字体 */
        min-height: 2.2rem;
        line-height: 1.15;
    }

    .course-description {
        font-size: 0.75rem; /* 移动端减小描述字体 */
        -webkit-line-clamp: 2;
        line-height: 1.3;
    }

    .course-tech-badge {
        font-size: 0.6rem;
        padding: 0.15rem 0.35rem;
    }

    .course-stats {
        flex-direction: row; /* 保持水平布局但调整间距 */
        gap: var(--space-xs);
        justify-content: space-between;
    }

    .course-stat {
        font-size: 0.7rem;
    }

    .mobile-menu-trigger {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 30px 30px;
        box-shadow: -5px 0 30px rgba(0,0,0,0.1);
        transition: all 0.4s cubic-bezier(0.77, 0, 0.175, 1);
        gap: 15px;
        z-index: 1000;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-link, .nav-cta {
        width: 100%;
    }

    .mobile-menu-trigger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }

    .mobile-menu-trigger.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-trigger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -6px);
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .feature-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 20px;
    }

    .feature-icon {
        margin-right: 0;
        margin-bottom: 15px;
    }
}

@media (max-width: 600px) {
    .card {
        min-width: 100%;
    }

    section {
        margin-bottom: var(--space-xl);
    }

    h2 {
        font-size: clamp(1.5rem, 5vw, 2rem);
    }
}

@media (max-width: 480px) {
    .courses-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xs);
    }

    .course-content {
        padding: 0.5rem;
    }

    .course-image-container {
        height: 100px; /* 小屏幕大幅减少图片高度 */
    }

    .course-card {
        max-height: 350px; /* 小屏幕显著减少最大高度限制 */
    }

    .course-meta {
        flex-direction: column;
        gap: 0.25rem;
        align-items: flex-start;
        padding: 0.5rem;
        margin: 0.25rem calc(-1 * 0.5rem) calc(-1 * 0.5rem);
    }

    .course-tech {
        gap: 0.15rem;
    }

    .course-tech-badge {
        font-size: 0.55rem;
        padding: 0.1rem 0.25rem;
    }

    .course-title {
        font-size: 0.9rem;
        min-height: 1.8rem;
        line-height: 1.1;
    }

    .course-description {
        font-size: 0.7rem;
        -webkit-line-clamp: 1; /* 小屏幕只显示一行描述 */
        line-height: 1.2;
    }
}

/* 课程按钮优化样式 */
.course-buttons a {
    transition: all 0.2s ease !important;
    box-shadow: none !important;
}

.course-buttons a:hover {
    transform: translateY(-1px) !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15) !important;
}

/* 移动端按钮优化 */
@media (max-width: 480px) {
    .course-buttons a {
        padding: 6px 2px !important;
        font-size: 0.7rem !important;
    }

    .course-buttons svg {
        width: 10px !important;
        height: 10px !important;
        margin-right: 2px !important;
    }
}

/* 无图片课程卡片样式优化 */
.course-card-noimage {
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.course-card-noimage:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.25);
}

.course-card-noimage .course-header-gradient {
    transition: all 0.4s ease;
}

.course-card-noimage:hover .course-header-gradient {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%) !important;
}

/* 无图片卡片按钮悬停效果 */
.course-card-noimage a[href*="bilibili"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 161, 214, 0.4) !important;
}

.course-card-noimage a[href*="course-outline"]:hover {
    background: #667eea !important;
    color: white !important;
    transform: translateY(-2px);
}

.course-card-noimage a[href*="study.163"]:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4) !important;
}

/* 无图片卡片技术标签悬停效果 */
.course-card-noimage .course-tech span:hover {
    background: linear-gradient(135deg, #667eea, #764ba2) !important;
    color: white !important;
    transform: translateY(-2px);
    border-color: transparent !important;
}

/* 渐变头部图标容器悬停动画 */
.course-card-noimage:hover .course-header-gradient > div:first-of-type > div:first-child {
    animation: pulse-icon 1.5s ease-in-out infinite;
}

@keyframes pulse-icon {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

/* 页脚样式 */
footer {
    text-align: center;
    padding: 40px 20px;
    color: #666;
    background: linear-gradient(to right, rgba(121, 40, 202, 0.05), rgba(255, 0, 128, 0.05));
    border-radius: var(--border-radius);
}

/* 课程卡片优化补充样式 */
.course-card {
    /* 改善卡片宽高比 */
    aspect-ratio: auto;
    min-height: 420px; /* 设置最小高度确保内容完整显示 */
}

/* 优化课程评分和价格的视觉层次 */
.course-rating {
    font-weight: 600;
    font-size: 0.8rem;
}

.course-price {
    font-size: 1.1rem;
    font-weight: 800;
}

/* 改善技术标签的视觉效果 */
.course-tech {
    margin: var(--space-xs) 0;
}

.course-tech-badge:first-child {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.15));
    border-color: rgba(99, 102, 241, 0.3);
}

/* 优化课程统计信息的布局 */
.course-stats {
    background: rgba(99, 102, 241, 0.02);
    border-radius: var(--border-radius-sm);
    padding: 0.4rem 0.5rem;
    margin-bottom: var(--space-sm);
    border: 1px solid rgba(99, 102, 241, 0.08);
}

/* 改善悬停效果的性能 */
.course-card:hover {
    transform: translateY(-8px) scale(1.01); /* 减少缩放避免布局抖动 */
}

/* 响应式优化：确保在超宽屏幕上的显示效果 */
@media (min-width: 1400px) {
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
        max-width: 1400px;
        margin: var(--space-xl) auto 0;
    }
}