/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #1e40af;
    --light-blue: #3b82f6;
    --dark-blue: #1e3a8a;
    --gold: #fbbf24;
    --light-gold: #fcd34d;
    --white: #ffffff;
    --light-gray: #f8fafc;
    --gray: #64748b;
    --dark-gray: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
}

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

/* 导航栏 */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.logo-icon {
    width: 40px;
    height: 40px;
    object-fit: contain;
    border-radius: 8px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark-gray);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover {
    color: var(--primary-blue);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gold);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    margin: 3px 0;
    transition: 0.3s;
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--light-blue) 100%);
    color: var(--white);
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.4s both;
}

.btn {
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background: var(--gold);
    color: var(--dark-gray);
}

.btn-primary:hover {
    background: var(--light-gold);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--white);
    color: var(--primary-blue);
}

.hero-decoration {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.floating-element {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.floating-element:nth-child(1) {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.floating-element:nth-child(2) {
    width: 120px;
    height: 120px;
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.floating-element:nth-child(3) {
    width: 60px;
    height: 60px;
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

/* 关于我们 */
.about {
    padding: 80px 0;
    background: var(--light-gray);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gold);
    border-radius: 2px;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.about-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.about-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.mission-list {
    list-style: none;
    text-align: left;
    margin-top: 1rem;
}

.mission-list li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.mission-list i {
    color: var(--gold);
    width: 20px;
}

.values-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 1rem;
}

.value-item {
    background: var(--primary-blue);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-weight: 500;
    text-align: center;
}

/* 课程信息 */
.courses {
    padding: 80px 0;
    background: var(--white);
}

.courses-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.tab-btn {
    padding: 12px 30px;
    border: 2px solid var(--primary-blue);
    background: transparent;
    color: var(--primary-blue);
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary-blue);
    color: var(--white);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.course-category {
    margin-bottom: 3rem;
}

.category-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
    text-align: center;
    position: relative;
}

.category-title::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: var(--gold);
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.course-card {
    background: var(--white);
    border: 2px solid var(--light-blue);
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--gold));
}

.course-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--gold);
}

.course-date {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.course-time {
    font-size: 1rem;
    color: var(--gold);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.course-location {
    font-size: 1rem;
    color: var(--gray);
}

/* 联系我们 */
.contact {
    padding: 80px 0;
    background: var(--light-gray);
}

.contact-content {
    text-align: center;
}

.qr-section h3 {
    font-size: 1.5rem;
    color: var(--primary-blue);
    margin-bottom: 2rem;
}

.qr-code {
    display: inline-block;
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.qr-placeholder {
    width: 250px;
    height: 300px;
    border: 2px solid var(--primary-blue);
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    padding: 1rem;
}

.qr-image {
    width: 180px;
    height: 180px;
    object-fit: contain;
    margin-bottom: 1rem;
    border-radius: 8px;
}

.qr-placeholder p {
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.qr-placeholder small {
    color: var(--gray);
    text-align: center;
    line-height: 1.4;
}

/* 页脚 */
.footer {
    background: var(--dark-blue);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-logo .logo-icon {
    width: 35px;
    height: 35px;
    object-fit: contain;
    border-radius: 6px;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
    }
    
    .courses-tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .about,
    .courses,
    .contact {
        padding: 60px 0;
    }
    
    .about-card,
    .course-card {
        padding: 1.5rem;
    }
    
    .course-date {
        font-size: 1.1rem;
    }
    
    .course-time,
    .course-location {
        font-size: 0.9rem;
    }
}

/* 活动图片展示 */
.gallery {
    padding: 80px 0;
    background: var(--white);
}

.gallery-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--gray);
    margin-bottom: 3rem;
    font-weight: 400;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    grid-auto-rows: 200px;
    gap: 1rem;
    margin-top: 2rem;
}

.gallery-item {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* 不同尺寸的图片容器 */
.gallery-item.large {
    grid-row: span 2;
    grid-column: span 2;
}

.gallery-item.medium {
    grid-row: span 2;
}

.gallery-item.small {
    grid-row: span 1;
}

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

.gallery-item:hover img {
    transform: scale(1.05);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        grid-auto-rows: 180px;
    }
    
    .gallery-item.large {
        grid-column: span 2;
        grid-row: span 2;
    }
}

@media (max-width: 768px) {
    .gallery {
        padding: 60px 0;
    }
    
    .gallery-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        grid-auto-rows: 150px;
        gap: 0.8rem;
    }
    
    .gallery-item.large {
        grid-column: span 2;
        grid-row: span 2;
    }
    
    .gallery-item.medium {
        grid-row: span 1;
    }
}

@media (max-width: 480px) {
    .gallery-grid {
        grid-template-columns: 1fr 1fr;
        grid-auto-rows: 120px;
        gap: 0.5rem;
    }
    
    .gallery-item.large,
    .gallery-item.medium {
        grid-column: span 2;
        grid-row: span 2;
    }
    
    .gallery-item.small {
        grid-row: span 1;
    }
}

/* 图片加载动画 */
.gallery-item img {
    opacity: 0;
    animation: fadeInImage 0.6s ease forwards;
}

@keyframes fadeInImage {
    from {
        opacity: 0;
        transform: scale(1.1);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 为不同的图片添加延迟动画 */
.gallery-item:nth-child(1) img { animation-delay: 0.1s; }
.gallery-item:nth-child(2) img { animation-delay: 0.2s; }
.gallery-item:nth-child(3) img { animation-delay: 0.3s; }
.gallery-item:nth-child(4) img { animation-delay: 0.4s; }
.gallery-item:nth-child(5) img { animation-delay: 0.5s; }
.gallery-item:nth-child(6) img { animation-delay: 0.6s; }
.gallery-item:nth-child(7) img { animation-delay: 0.7s; }
.gallery-item:nth-child(8) img { animation-delay: 0.8s; }
.gallery-item:nth-child(9) img { animation-delay: 0.9s; }
.gallery-item:nth-child(10) img { animation-delay: 1.0s; }

/* 私域直播 */
.live {
    padding: 80px 0;
    background: var(--light-gray);
}

.live-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--gray);
    margin-bottom: 3rem;
    font-weight: 400;
}

.live-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.live-item {
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
}

.live-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.live-image {
    width: 100%;
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.live-image img {
    max-width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

.live-item:hover .live-image img {
    transform: scale(1.02);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .live {
        padding: 60px 0;
    }
    
    .live-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        max-width: 400px;
    }
    
    .live-image {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .live-grid {
        max-width: 300px;
    }
    
    .live-image {
        padding: 0.8rem;
    }
}