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

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --text-dark: #2d3748;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --danger-color: #f56565;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--bg-light);
}

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

/* ===== 导航栏 ===== */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
}

.logo i {
    font-size: 2rem;
}

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

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

.nav-links a:hover,
.nav-links a.active {
    background-color: rgba(255, 255, 255, 0.2);
}

.lang-switcher {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-left: 1rem;
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    background-color: transparent;
    color: white;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.lang-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.lang-btn.active {
    background-color: white;
    color: var(--primary-color);
    border-color: white;
}

.cart-icon {
    position: relative;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

.cart-count {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--danger-color);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: bold;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: white;
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* ===== 主横幅 ===== */
.hero {
    position: relative;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0;
    text-align: center;
    overflow: hidden;
}

.hero::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 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,112C672,96,768,96,864,112C960,128,1056,160,1152,160C1248,160,1344,128,1392,112L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') bottom center no-repeat;
    background-size: cover;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: fadeInUp 1s ease 0.2s backwards;
}

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

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

/* ===== 按钮样式 ===== */
.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

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

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

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

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

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

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.2rem;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-full {
    width: 100%;
}

/* ===== 特色功能 ===== */
.features {
    padding: 80px 0;
    background-color: var(--bg-white);
}

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

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

.feature-card {
    background-color: var(--bg-white);
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.feature-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.feature-link:hover {
    gap: 10px;
}

/* ===== 慈善横幅 ===== */
.charity-banner {
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: white;
    padding: 3rem 0;
}

.charity-content {
    display: flex;
    align-items: center;
    gap: 2rem;
    justify-content: center;
}

.charity-icon {
    font-size: 4rem;
    animation: heartbeat 1.5s ease-in-out infinite;
}

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

.charity-text h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.charity-text p {
    font-size: 1.1rem;
    opacity: 0.95;
}

/* ===== 热门产品 ===== */
.popular-products {
    padding: 80px 0;
    background-color: var(--bg-light);
}

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

.product-card {
    background-color: var(--bg-white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.product-image {
    position: relative;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 4rem;
}

.product-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--danger-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.product-card h3 {
    padding: 1.5rem 1.5rem 0.5rem;
    font-size: 1.3rem;
}

.product-card p {
    padding: 0 1.5rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.product-price {
    padding: 0 1.5rem 1.5rem;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
}

.product-card .btn {
    margin: 0 1.5rem 1.5rem;
    width: calc(100% - 3rem);
}

/* ===== 统计数据 ===== */
.stats {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* ===== 页脚 ===== */
.footer {
    background-color: #2d3748;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.footer-section p {
    color: #a0aec0;
    margin-bottom: 1rem;
}

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

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

.footer-section ul li a {
    color: #a0aec0;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #a0aec0;
}

/* ===== 页面标题 ===== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 60px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* ===== 课程页面 ===== */
.courses-section {
    padding: 60px 0;
    background-color: var(--bg-white);
}

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

.filter-btn {
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--border-color);
    background-color: white;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-color: transparent;
}

.courses-category {
    margin-bottom: 4rem;
}

.category-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

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

.course-card {
    background-color: var(--bg-white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.course-thumbnail {
    position: relative;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
}

.course-duration {
    position: absolute;
    bottom: 15px;
    right: 15px;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.85rem;
}

.course-info {
    padding: 1.5rem;
}

.course-info h3 {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
}

.course-info p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ===== 3D工具页面 ===== */
.tools-intro {
    padding: 60px 0;
    background-color: var(--bg-white);
}

.intro-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.intro-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.intro-text p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.benefits-list {
    list-style: none;
}

.benefits-list li {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-dark);
}

.benefits-list i {
    color: var(--success-color);
    font-size: 1.2rem;
}

.visual-placeholder {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    height: 400px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8rem;
    color: white;
}

.tools-showcase {
    padding: 60px 0;
    background-color: var(--bg-light);
}

.tool-category {
    margin-bottom: 4rem;
}

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

.tool-card {
    background-color: var(--bg-white);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.tool-image {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    height: 150px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
    margin-bottom: 1.5rem;
}

.tool-card h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.tool-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.tool-features {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.feature-tag {
    background-color: var(--bg-light);
    color: var(--primary-color);
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
}

.purchase-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 60px 0;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* ===== 游戏页面 ===== */
.games-intro {
    padding: 60px 0;
    background-color: var(--bg-white);
}

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

.intro-item {
    text-align: center;
    padding: 2rem;
}

.intro-item i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.intro-item h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.intro-item p {
    color: var(--text-light);
}

.games-showcase {
    padding: 60px 0;
    background-color: var(--bg-light);
}

.game-category {
    margin-bottom: 4rem;
}

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

.game-card {
    background-color: var(--bg-white);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.game-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
}

.game-difficulty {
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
}

.game-difficulty.easy {
    background-color: #c6f6d5;
    color: #22543d;
}

.game-difficulty.medium {
    background-color: #feebc8;
    color: #7c2d12;
}

.game-difficulty.hard {
    background-color: #fed7d7;
    color: #742a2a;
}

.game-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.game-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.game-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

.leaderboard {
    padding: 60px 0;
    background-color: var(--bg-white);
}

.leaderboard-content {
    max-width: 600px;
    margin: 0 auto;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background-color: var(--bg-white);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.leaderboard-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-md);
}

.leaderboard-item.top1 {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
}

.leaderboard-item.top2 {
    background: linear-gradient(135deg, #c0c0c0, #e8e8e8);
}

.leaderboard-item.top3 {
    background: linear-gradient(135deg, #cd7f32, #e8b375);
}

.leaderboard-item .rank {
    font-size: 2rem;
    font-weight: 800;
    min-width: 50px;
    text-align: center;
}

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

.player-avatar {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.player-name {
    font-weight: 600;
    font-size: 1.1rem;
}

.player-score {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* ===== 商店页面 ===== */
.charity-notice {
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: white;
    padding: 1.5rem 0;
    text-align: center;
}

.notice-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.notice-content i {
    font-size: 2rem;
}

.shop-section {
    padding: 60px 0;
    background-color: var(--bg-white);
}

.shop-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.shop-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.shop-card {
    background-color: var(--bg-white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    position: relative;
}

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

.product-img {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    color: white;
}

.product-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    z-index: 10;
}

.product-badge.hot {
    background-color: var(--danger-color);
}

.product-content {
    padding: 1.5rem;
}

.product-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
}

.product-content > p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.product-includes {
    list-style: none;
    margin-bottom: 1.5rem;
}

.product-includes li {
    margin-bottom: 0.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.product-includes i {
    color: var(--success-color);
    margin-right: 0.5rem;
}

.product-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.price {
    display: flex;
    flex-direction: column;
}

.current-price {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--danger-color);
}

.original-price {
    font-size: 1rem;
    color: var(--text-light);
    text-decoration: line-through;
}

.products-category {
    margin-bottom: 4rem;
}

/* ===== 关于页面 ===== */
.about-story {
    padding: 60px 0;
    background-color: var(--bg-white);
}

.story-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
}

.story-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.story-text p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
}

.timeline-dot {
    position: absolute;
    left: -2.5rem;
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: var(--shadow-md);
}

.timeline-content h4 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 0.3rem;
}

.timeline-content p {
    color: var(--text-light);
}

.mission {
    padding: 60px 0;
    background-color: var(--bg-light);
}

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

.mission-card {
    background-color: var(--bg-white);
    border-radius: 15px;
    padding: 2.5rem;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.mission-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.mission-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.mission-card p {
    color: var(--text-light);
    line-height: 1.8;
}

.charity-section {
    padding: 80px 0;
    background-color: var(--bg-white);
}

.charity-header {
    text-align: center;
    margin-bottom: 3rem;
}

.charity-header i {
    font-size: 4rem;
    color: var(--danger-color);
    margin-bottom: 1rem;
}

.charity-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.charity-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
}

.charity-content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.charity-info h3,
.charity-impact h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.commitment-box {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 15px;
}

.commitment-stat {
    text-align: center;
    margin-bottom: 1.5rem;
}

.stat-large {
    font-size: 4rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.commitment-text p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.charity-uses {
    list-style: none;
}

.charity-uses li {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.charity-uses i {
    color: var(--success-color);
}

.impact-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.impact-item {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
}

.impact-number {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.impact-label {
    font-size: 1rem;
    opacity: 0.9;
}

.charity-stories {
    margin-bottom: 3rem;
}

.charity-stories h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

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

.story-card {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 15px;
    position: relative;
}

.story-quote {
    font-size: 3rem;
    color: var(--primary-color);
    opacity: 0.3;
    margin-bottom: 1rem;
}

.story-card p {
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.story-author {
    display: flex;
    flex-direction: column;
}

.story-author strong {
    color: var(--text-dark);
}

.story-author span {
    color: var(--text-light);
    font-size: 0.9rem;
}

.charity-transparency {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
}

.charity-transparency h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.charity-transparency p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.team {
    padding: 60px 0;
    background-color: var(--bg-light);
}

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

.team-member {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.team-member:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.member-avatar {
    width: 100px;
    height: 100px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
}

.team-member h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.member-role {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.member-bio {
    color: var(--text-light);
}

.contact {
    padding: 60px 0;
    background-color: var(--bg-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info h3,
.contact-form h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.contact-info p {
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

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

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 0.3rem;
}

.contact-item strong {
    display: block;
    margin-bottom: 0.3rem;
}

.contact-item p {
    color: var(--text-light);
    margin: 0;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* ===== 模态框 ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background-color: var(--bg-white);
    margin: 5% auto;
    padding: 2rem;
    border-radius: 15px;
    max-width: 800px;
    position: relative;
    animation: slideIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close {
    position: absolute;
    right: 1.5rem;
    top: 1.5rem;
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-light);
    cursor: pointer;
    transition: color 0.3s ease;
}

.close:hover {
    color: var(--text-dark);
}

.demo-container,
.game-container {
    margin-top: 2rem;
}

.demo-placeholder,
.game-placeholder {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    height: 400px;
    border-radius: 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    gap: 1rem;
}

.demo-placeholder i,
.game-placeholder i {
    font-size: 5rem;
}

.demo-placeholder p,
.game-placeholder p {
    font-size: 1.2rem;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        width: 100%;
        text-align: center;
        transition: left 0.3s ease;
        padding: 2rem 0;
        box-shadow: var(--shadow-lg);
        z-index: 999;
    }

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

    .lang-switcher {
        position: fixed;
        top: 15px;
        right: 70px;
        z-index: 1001;
    }

    .lang-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .section-title {
        font-size: 2rem;
    }

    .features-grid,
    .products-grid,
    .courses-grid,
    .tools-grid,
    .games-grid,
    .shop-grid {
        grid-template-columns: 1fr;
    }

    .intro-content,
    .story-content,
    .charity-content-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .modal-content {
        margin: 10% 5%;
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .btn {
        padding: 0.6rem 1.5rem;
        font-size: 0.9rem;
    }
}