/* 全局样式 */
:root {
    --primary-color: #4a90e2;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-gray: #f5f6fa;
    --dark-gray: #2d3436;
}

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

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

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

/* 导航栏样式 */
.navbar {
    background-color: white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo h1 {
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: bold;
}

.nav-links {
    display: flex;
    list-style: none;
    align-items: center;
}

.nav-links li a {
    color: var(--text-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    transition: color 0.3s ease;
}

.nav-links li a:hover {
    color: var(--primary-color);
}

.login-btn {
    background-color: var(--primary-color);
    color: white !important;
    padding: 0.5rem 1.5rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.login-btn:hover {
    background-color: #357abd;
}

/* Hero区域样式 */
.hero {
    background: linear-gradient(rgba(74, 144, 226, 0.9), rgba(74, 144, 226, 0.9)), url('https://source.unsplash.com/random/1920x1080/?education') center/cover;
    height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
    color: white;
    padding-top: 70px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease 0.2s;
    opacity: 0;
    animation-fill-mode: forwards;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 1s ease 0.4s;
    opacity: 0;
    animation-fill-mode: forwards;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-3px);
}

.cta-button.primary {
    background-color: var(--secondary-color);
    color: white;
}

.cta-button.secondary {
    background-color: transparent;
    border: 2px solid white;
    color: white;
}

/* 特色优势样式 */
.features {
    padding: 5rem 0;
    background-color: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    border-radius: 10px;
    transition: transform 0.3s ease;
    background: white;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* 课程样式 */
.courses {
    padding: 5rem 0;
    background-color: var(--light-gray);
}

.courses h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-color);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.course-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.course-card:hover {
    transform: translateY(-5px);
}

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

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.course-tag {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--accent-color);
    color: white;
    padding: 0.3rem 1rem;
    border-radius: 3px;
}

.course-content {
    padding: 1.5rem;
}

.course-info {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
    color: #666;
}

.course-info i {
    color: var(--primary-color);
}

.course-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.course-btn:hover {
    background-color: #357abd;
}

/* 教师团队样式 */
.teachers {
    padding: 5rem 0;
    background-color: white;
}

.teachers h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-color);
}

.teachers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.teacher-card {
    text-align: center;
    padding: 2rem;
    border-radius: 10px;
    background: white;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.teacher-card:hover {
    transform: translateY(-5px);
}

.teacher-card img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    margin-bottom: 1rem;
    object-fit: cover;
}

.teacher-subject {
    color: var(--primary-color);
    margin: 0.5rem 0;
}

.teacher-social {
    margin-top: 1rem;
}

.teacher-social a {
    color: var(--text-color);
    margin: 0 0.5rem;
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.teacher-social a:hover {
    color: var(--primary-color);
}

/* 学习资源样式 */
.resources {
    padding: 5rem 0;
    background-color: var(--light-gray);
}

.resources h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-color);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.resource-card {
    text-align: center;
    padding: 2rem;
    border-radius: 10px;
    background: white;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.resource-card:hover {
    transform: translateY(-5px);
}

.resource-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.resource-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    text-decoration: none;
    margin-top: 1rem;
    transition: background-color 0.3s ease;
}

.resource-btn:hover {
    background-color: #357abd;
}

/* 联系我们样式 */
.contact {
    padding: 5rem 0;
    background-color: white;
}

.contact h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-color);
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.contact-form textarea {
    height: 150px;
    resize: vertical;
}

.submit-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
}

.submit-btn:hover {
    background-color: #357abd;
}

/* 页脚样式 */
.footer {
    background-color: var(--dark-gray);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    font-size: 1.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .features-grid,
    .courses-grid,
    .teachers-grid,
    .resources-grid,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 15px;
    }
}