/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 广告类型标签页样式 */
.ad-type-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    font-size: 14px;
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.tab-btn:hover:not(.active) {
    background: rgba(102, 126, 234, 0.1);
    border-color: rgba(102, 126, 234, 0.3);
}

/* 响应式处理 - 广告类型标签页 */
@media (max-width: 768px) {
    .ad-type-tabs {
        justify-content: center;
    }
    
    .tab-btn {
        padding: 10px 20px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .ad-type-tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .tab-btn {
        width: 100%;
        max-width: 200px;
        text-align: center;
    }
}

:root {
    --primary-color: #667eea;
    --primary-dark: #5a6fd8;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-dark: #1a202c;
    --border-color: #e2e8f0;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --error-color: #f56565;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

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

/* 语言切换器 */
.language-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    display: flex;
    gap: 5px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 5px;
    border-radius: 25px;
    box-shadow: var(--shadow-md);
}

.lang-btn {
    padding: 8px 16px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

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

.lang-btn:hover:not(.active) {
    background: rgba(102, 126, 234, 0.1);
}

/* 粒子背景 */
#particles-js {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 24px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

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

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

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

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

/* 首页 */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    position: relative;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9), rgba(118, 75, 162, 0.9));
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    animation: fadeInUp 1s ease;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.9;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeInUp 1s ease 0.4s both;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background: #e879f9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

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

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

/* 通用部分样式 */
section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: var(--text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

/* 服务介绍 */
.services {
    background: var(--bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.service-card {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.service-icon i {
    font-size: 32px;
    color: white;
}

.service-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.service-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.service-features {
    list-style: none;
}

.service-features li {
    padding: 5px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 20px;
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* 成功案例 */
.cases-filter {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 20px;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

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

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

.case-card {
    background: white;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.case-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.case-content {
    padding: 30px;
}

.case-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.case-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.case-stats {
    display: flex;
    gap: 30px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* 关于我们 */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.about-features {
    margin-top: 30px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.feature i {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.feature h4 {
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.feature p {
    color: var(--text-secondary);
    margin: 0;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.stat-item .stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

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

/* 定价方案 */
.pricing {
    background: var(--bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    position: relative;
    transition: var(--transition);
}

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

.pricing-card.featured {
    transform: scale(1.05);
    border: 2px solid var(--primary-color);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-5px);
}

.badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 5px 20px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.price {
    margin-bottom: 20px;
}

.currency {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.period {
    color: var(--text-secondary);
}

.pricing-card > p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.pricing-features {
    list-style: none;
    margin-bottom: 30px;
}

.pricing-features li {
    padding: 10px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.pricing-features li:last-child {
    border-bottom: none;
}

/* 联系我们 */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 30px;
}

.contact-item i {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.contact-item h4 {
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-primary);
}

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

.contact-form {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.form-group {
    position: relative;
    margin-bottom: 30px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition);
    background: transparent;
}

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

.form-group label {
    position: absolute;
    top: 15px;
    left: 15px;
    color: var(--text-secondary);
    transition: var(--transition);
    pointer-events: none;
    background: white;
    padding: 0 5px;
}

.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group select:focus + label,
.form-group select:not([value=""]) + label,
.form-group textarea:focus + label,
.form-group textarea:not(:placeholder-shown) + label {
    top: -10px;
    font-size: 12px;
    color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
    color: white;
}

.footer-section p {
    color: #a0aec0;
    margin-bottom: 10px;
}

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

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

.footer-section ul li a {
    color: #a0aec0;
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #4a5568;
    color: #a0aec0;
}

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

/* 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: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: 20px 0;
    }

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

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-content p {
        font-size: 1.1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 250px;
        text-align: center;
    }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

    .pricing-card.featured {
        transform: none;
    }

    .language-switcher {
        top: 10px;
        right: 10px;
    }

    section {
        padding: 60px 0;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .service-card,
    .case-card,
    .pricing-card,
    .contact-form {
        padding: 30px 20px;
    }

    .cases-filter {
        flex-direction: column;
        align-items: center;
    }

    .filter-btn {
        width: 100%;
        max-width: 200px;
    }
}

/* 隐藏和显示元素 */
.hidden {
    display: none !important;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 案例卡片动画 */
.case-card {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.case-card:nth-child(1) { animation-delay: 0.1s; }
.case-card:nth-child(2) { animation-delay: 0.2s; }
.case-card:nth-child(3) { animation-delay: 0.3s; }
.case-card:nth-child(4) { animation-delay: 0.4s; }

/* 服务卡片动画 */
.service-card {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.service-card:nth-child(1) { animation-delay: 0.1s; }
.service-card:nth-child(2) { animation-delay: 0.2s; }
.service-card:nth-child(3) { animation-delay: 0.3s; }
.service-card:nth-child(4) { animation-delay: 0.4s; }

/* 充值方案新增样式 */
.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.bonus-info {
    margin: 15px 0;
    padding: 15px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: var(--border-radius);
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.bonus-tag {
    display: inline-block;
    background: var(--success-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-right: 10px;
}

.bonus-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.pricing-usage {
    margin-top: 80px;
    text-align: center;
}

.pricing-usage h3 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 40px;
    color: var(--text-primary);
}

.usage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 900px;
    margin: 0 auto 60px;
}

.usage-item {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
}

.usage-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.usage-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin: 0 auto 20px;
}

.usage-item h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.usage-item p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 0.9rem;
}

.usage-price {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
}

.pricing-note {
    max-width: 800px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border: 1px solid rgba(102, 126, 234, 0.1);
    border-radius: var(--border-radius-lg);
    padding: 30px;
}

.note-content {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    text-align: left;
}

.note-content i {
    font-size: 24px;
    color: var(--primary-color);
    margin-top: 5px;
    flex-shrink: 0;
}

.note-content h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.note-content p {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .bonus-info {
        padding: 12px;
    }
    
    .bonus-tag {
        display: block;
        margin-bottom: 5px;
        margin-right: 0;
    }
    
    .usage-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .note-content {
        flex-direction: column;
        text-align: center;
    }
    
    .note-content i {
        margin: 0 auto 15px;
    }
}