/* 基础样式 */
:root {
    --primary-color: #4A90E2;
    --secondary-color: #7B68EE;
    --accent-color: #FF6B6B;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --text-dark: #333;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --bg-white: #fff;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-warm: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-nature: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.15);
    --radius: 16px;
    --radius-sm: 8px;
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    background: var(--bg-white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 12px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo img {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    object-fit: contain;
    background: transparent;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-name {
    font-size: 20px;
    font-weight: 700;
    color: #f58216;
}

.logo-slogan {
    font-size: 12px;
    color: var(--text-light);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    background: var(--gradient-primary);
    color: white;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
}

.login-btn {
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    transition: transform 0.3s ease;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* 英雄区 */
.hero {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.1) 0%, transparent 50%);
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text h1 {
    font-size: 48px;
    font-weight: 900;
    color: white;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-text .highlight {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255,255,255,0.9);
    margin-bottom: 24px;
}

.hero-tags {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.tag {
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(10px);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    max-width: 500px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-hover);
}

/* 用户面板 */
.user-panel {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    min-width: 220px;
}

.user-avatar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.user-avatar img {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    object-fit: contain;
}

.user-info .greeting {
    font-weight: 600;
    color: var(--text-dark);
}

.user-info .question {
    font-size: 12px;
    color: var(--text-light);
}

.quick-menu {
    list-style: none;
}

.quick-menu li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    cursor: pointer;
    transition: color 0.3s ease;
}

.quick-menu li:hover {
    color: var(--primary-color);
}

.quick-menu .icon {
    font-size: 20px;
}

/* 区块标题 */
.section-title {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: var(--text-dark);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.more-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

/* 五院学院 */
.academy-section {
    padding: 80px 0;
    background: var(--bg-white);
}

.academy-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.academy-card,
.academy-character {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.academy-card:hover,
.academy-character:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.academy-card.science {
    border-color: #4A90E2;
    background: linear-gradient(135deg, rgba(74,144,226,0.1) 0%, rgba(255,255,255,1) 100%);
}

.academy-card.nature {
    border-color: #4CAF50;
    background: linear-gradient(135deg, rgba(76,175,80,0.1) 0%, rgba(255,255,255,1) 100%);
}

.academy-card.invention {
    border-color: #FF6B6B;
    background: linear-gradient(135deg, rgba(255,107,107,0.1) 0%, rgba(255,255,255,1) 100%);
}

.academy-card.expression {
    border-color: #9C27B0;
    background: linear-gradient(135deg, rgba(156,39,176,0.1) 0%, rgba(255,255,255,1) 100%);
}

.academy-character.growth {
    border-color: #FF9800;
    background: linear-gradient(135deg, rgba(255,152,0,0.1) 0%, rgba(255,255,255,1) 100%);
}

.card-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.academy-card h3,
.academy-character h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.academy-card p,
.academy-character p {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 16px;
}

.card-btn {
    display: inline-block;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    transition: transform 0.3s ease;
}

.card-btn:hover {
    transform: scale(1.05);
}

/* 产品区 */
.products-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.product-image {
    height: 160px;
    overflow: hidden;
}

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

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

.product-card h3 {
    font-size: 16px;
    font-weight: 600;
    padding: 16px 16px 4px;
}

.product-card p {
    font-size: 13px;
    color: var(--text-light);
    padding: 0 16px;
}

.price {
    display: block;
    padding: 12px 16px 16px;
    color: var(--accent-color);
    font-weight: 700;
    font-size: 18px;
}

/* 功能区 */
.features-section {
    padding: 80px 0;
    background: var(--bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 32px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.feature-card.challenge {
    background: linear-gradient(135deg, rgba(102,126,234,0.1) 0%, rgba(255,255,255,1) 100%);
}

.feature-card.parents {
    background: linear-gradient(135deg, rgba(240,147,251,0.1) 0%, rgba(255,255,255,1) 100%);
}

.feature-card.map {
    background: linear-gradient(135deg, rgba(79,172,254,0.1) 0%, rgba(255,255,255,1) 100%);
}

.feature-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--text-light);
    margin-bottom: 16px;
}

.feature-card ul {
    list-style: none;
    margin-bottom: 20px;
}

.feature-card li {
    padding: 4px 0;
    color: var(--text-light);
    font-size: 14px;
}

.feature-btn {
    display: inline-block;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    padding: 10px 24px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

.feature-image {
    position: absolute;
    right: -20px;
    bottom: -20px;
    width: 150px;
    height: 150px;
    opacity: 0.3;
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* 为什么选择我们 */
.why-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
    text-align: center;
}

.why-item {
    padding: 32px 16px;
}

.why-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.why-item h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.why-item p {
    font-size: 13px;
    color: var(--text-light);
}

/* 页脚 */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand .logo-name {
    color: white;
}

.footer-brand .logo-slogan {
    color: rgba(255,255,255,0.7);
}

.footer-brand p {
    margin-top: 16px;
    color: rgba(255,255,255,0.7);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.link-group h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

.link-group ul {
    list-style: none;
}

.link-group a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    display: block;
    padding: 6px 0;
    transition: color 0.3s ease;
}

.link-group a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.5);
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .user-panel {
        position: relative;
        right: auto;
        top: auto;
        transform: none;
        margin-top: 40px;
    }
    
    .academy-grid,
    .products-grid,
    .why-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-text h1 {
        font-size: 32px;
    }
    
    .academy-grid,
    .products-grid,
    .why-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

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

.academy-card,
.product-card,
.feature-card,
.why-item {
    animation: fadeInUp 0.6s ease forwards;
}