/* 全局样式 */
:root {
    --primary-color: #FF5722;
    --secondary-color: #263238;
    --accent-color: #00BCD4;
    --background-color: #f9f9f9;
    --text-color: #333;
    --light-text: #fff;
    --dark-text: #222;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--secondary-color);
    font-weight: 700;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.btn {
    display: inline-block;
    padding: 12px 25px;
    background-color: var(--primary-color);
    color: var(--light-text);
    border-radius: 5px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn:hover {
    background-color: #e64a19;
    transform: translateY(-3px);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--light-text);
}

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

.btn-secondary:hover {
    background-color: #374046;
}

/* 文字动效 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 导航栏样式 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 15px 0;
    transition: var(--transition);
}

header.scrolled {
    padding: 10px 0;
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--secondary-color);
    transition: var(--transition);
}

.logo h1 span {
    color: var(--primary-color);
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    font-size: 1.05rem;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    padding-bottom: 5px;
    position: relative;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

nav ul li a:hover, nav ul li a.active {
    color: var(--primary-color);
}

nav ul li a:hover::after, nav ul li a.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--secondary-color);
}

/* 英雄区样式 */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('../images/hero-bg.jpg') no-repeat center center/cover;
    display: flex;
    align-items: center;
    text-align: center;
}

.hero-content {
    color: var(--light-text);
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    animation: fadeIn 1s ease-in-out;
}

.hero-content h2 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

/* 特色区块样式 */
.features {
    padding: 100px 0;
    background-color: var(--background-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-item {
    background-color: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    padding: 30px;
    text-align: center;
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-item h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--secondary-color);
}

.feature-item p {
    color: #666;
}

/* 关于我们区块样式 */
.about {
    padding: 100px 0;
}

.about-content {
    display: flex;
    align-items: center;
    gap: 50px;
}

.about-image {
    flex: 1;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.about-text {
    flex: 1;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.about-text p {
    margin-bottom: 15px;
    color: #666;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 30px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-text {
    color: var(--secondary-color);
    font-weight: 500;
}

/* 推荐区块样式 */
.testimonials {
    padding: 100px 0;
    background-color: var(--background-color);
    text-align: center;
}

.testimonial-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.testimonial {
    background-color: #fff;
    border-radius: 10px;
    padding: 40px;
    box-shadow: var(--box-shadow);
    margin: 20px 0;
    display: none;
}

.testimonial.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

.testimonial-text {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #555;
    font-style: italic;
    line-height: 1.8;
    position: relative;
}

.testimonial-text::before, .testimonial-text::after {
    content: '"';
    font-size: 4rem;
    color: rgba(255, 87, 34, 0.1);
    position: absolute;
}

.testimonial-text::before {
    top: -30px;
    left: -20px;
}

.testimonial-text::after {
    bottom: -60px;
    right: -20px;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
}

.author-image {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    overflow: hidden;
    margin-right: 15px;
}

.author-info h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
    color: var(--secondary-color);
}

.author-info p {
    font-size: 0.9rem;
    color: #666;
}

.testimonial-nav {
    margin-top: 30px;
}

.nav-dot {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #ccc;
    margin: 0 5px;
    cursor: pointer;
    transition: var(--transition);
}

.nav-dot.active {
    background-color: var(--primary-color);
    transform: scale(1.3);
}

/* 课程区块样式 */
.courses {
    padding: 100px 0;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.course-card {
    background-color: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.course-image {
    height: 200px;
    overflow: hidden;
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.course-card:hover .course-image img {
    transform: scale(1.1);
}

.course-body {
    padding: 20px;
}

.course-title {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--secondary-color);
}

.course-description {
    color: #666;
    margin-bottom: 15px;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-top: 1px solid #eee;
}

.course-rating {
    display: flex;
    align-items: center;
}

.course-rating i {
    color: #FFB900;
    margin-right: 5px;
}

.view-all {
    text-align: center;
    margin-top: 50px;
}

/* CTA区块样式 */
.cta {
    padding: 100px 0;
    background: linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8)), url('../images/cta-bg.jpg') no-repeat center center/cover;
    text-align: center;
    color: var(--light-text);
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.cta h3 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.cta p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* 博客区块样式 */
.blog {
    padding: 100px 0;
    background-color: var(--background-color);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.blog-card {
    background-color: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.blog-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.blog-image {
    height: 200px;
    overflow: hidden;
}

.blog-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.blog-card:hover .blog-image img {
    transform: scale(1.1);
}

.blog-body {
    padding: 20px;
}

.blog-meta {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    font-size: 0.9rem;
    color: #777;
}

.blog-meta span {
    display: flex;
    align-items: center;
    margin-right: 15px;
}

.blog-meta i {
    margin-right: 5px;
    color: var(--primary-color);
}

.blog-title {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--secondary-color);
}

.blog-excerpt {
    color: #666;
    margin-bottom: 15px;
}

.blog-footer {
    padding: 15px 20px;
    border-top: 1px solid #eee;
}

/* 页脚样式 */
footer {
    background-color: var(--secondary-color);
    color: #ccc;
    padding-top: 70px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-about, .footer-links, .footer-contact, .footer-newsletter {
    font-size: 0.95rem;
}

.footer-about h3, .footer-links h3, .footer-contact h3, .footer-newsletter h3 {
    color: #fff;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.footer-about p {
    line-height: 1.7;
    margin-bottom: 15px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.05);
    color: #fff;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a {
    color: #ccc;
    transition: var(--transition);
}

.footer-links ul li a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-contact ul li {
    display: flex;
    margin-bottom: 15px;
}

.footer-contact ul li i {
    margin-right: 10px;
    color: var(--primary-color);
}

.newsletter-form {
    display: flex;
    margin-top: 15px;
}

.newsletter-form input {
    flex: 1;
    padding: 10px;
    border: none;
    outline: none;
    background-color: rgba(255, 255, 255, 0.05);
    color: #fff;
    border-radius: 5px 0 0 5px;
}

.newsletter-form button {
    padding: 10px 15px;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 0 5px 5px 0;
    cursor: pointer;
    transition: var(--transition);
}

.newsletter-form button:hover {
    background-color: #e64a19;
}

.footer-bottom {
    background-color: #1a2327;
    text-align: center;
    padding: 20px 0;
    font-size: 0.9rem;
}

/* 动画效果 */
.animate {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.animated {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式样式 */
@media (max-width: 1024px) {
    .hero-content h2 {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .about-image, .about-text {
        flex: none;
        width: 100%;
    }
}

@media (max-width: 768px) {
    header nav {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #fff;
        box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    header nav.active {
        max-height: 300px;
    }
    
    nav ul {
        flex-direction: column;
        padding: 20px 0;
    }
    
    nav ul li {
        margin: 0;
        text-align: center;
        padding: 12px 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero-content h2 {
        font-size: 2.5rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonial {
        padding: 25px;
    }
}

@media (max-width: 576px) {
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .testimonial-text::before, .testimonial-text::after {
        display: none;
    }
}