/* 重置和基础样式 */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary: #7c3aed;
    --accent: #f59e0b;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --light: #f8fafc;
    --white: #ffffff;
    --success: #10b981;
    --border: #334155;
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    --shadow-light: 0 5px 15px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #e2e8f0;
    background-color: var(--dark);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

a:hover {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
}

/* 头部样式 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 700;
    font-size: 1.2rem;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
}

.logo-text span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-link {
    color: #cbd5e1;
    font-weight: 500;
    font-size: 1rem;
    position: relative;
    padding: 8px 0;
}

.nav-link:hover {
    color: var(--white);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: var(--transition);
}

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

.nav-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero区域 */
.hero {
    padding: 180px 0 120px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, rgba(37, 99, 235, 0) 70%);
    border-radius: 50%;
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--white);
}

.hero-title span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--gray-light);
    margin-bottom: 40px;
    line-height: 1.8;
    max-width: 700px;
}

.hero-stats {
    display: flex;
    gap: 48px;
    margin-top: 60px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-label {
    color: var(--gray-light);
    font-size: 0.95rem;
    margin-top: 8px;
}

/* 区域标题 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, #ffffff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-light);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
}

/* 服务区域 */
.services {
    background-color: rgba(30, 41, 59, 0.5);
    border-radius: var(--radius);
    padding: 60px;
    margin-bottom: 60px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.service-card {
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.8));
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    padding: 40px 30px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
    border-color: rgba(37, 99, 235, 0.2);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 28px;
    color: var(--white);
}

.icon-d1 {
    background: linear-gradient(135deg, var(--primary), #60a5fa);
}

.icon-dd {
    background: linear-gradient(135deg, #059669, #34d399);
}

.icon-bing {
    background: linear-gradient(135deg, #7c3aed, #a78bfa);
}

.service-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
}

.service-description {
    color: var(--gray-light);
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-features {
    margin-top: 20px;
}

.service-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    color: #cbd5e1;
    font-size: 0.95rem;
}

.service-feature::before {
    content: '✓';
    color: var(--success);
    font-weight: bold;
}

/* 流程区域 */
.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.process-step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 24px;
    position: relative;
    z-index: 1;
}

.step-title {
    font-size: 1.3rem;
    color: var(--white);
    margin-bottom: 16px;
}

.step-description {
    color: var(--gray-light);
    line-height: 1.7;
}

/* 合规声明 */
.compliance {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
    border-radius: var(--radius);
    padding: 40px;
    margin: 40px 0;
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.compliance-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

.compliance-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 24px;
    flex-shrink: 0;
}

.compliance-title {
    font-size: 2rem;
    color: var(--white);
}

.compliance-content {
    color: #cbd5e1;
    line-height: 1.8;
}

.compliance-content ul {
    margin-top: 15px;
    padding-left: 20px;
}

.compliance-content li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 20px;
}

.compliance-content li::before {
    content: '•';
    color: var(--primary);
    font-size: 1.5rem;
    position: absolute;
    left: 0;
    top: -3px;
}

/* FAQ区域 */
.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-category {
    margin-bottom: 50px;
}

.faq-category-title {
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid rgba(37, 99, 235, 0.3);
}

.faq-item {
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.8));
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    margin-bottom: 15px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(37, 99, 235, 0.2);
}

.faq-question {
    padding: 20px;
    background-color: transparent;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--white);
    font-size: 1.1rem;
}

.faq-question i {
    transition: var(--transition);
    color: var(--primary);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-item.active .faq-answer {
    padding: 0 20px 20px;
    max-height: 1000px;
}

.faq-answer p {
    color: var(--gray-light);
    line-height: 1.8;
    margin-bottom: 15px;
}

/* CTA区域 */
.cta {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary));
    color: var(--white);
    text-align: center;
    padding: 80px 0;
    border-radius: var(--radius);
    margin: 40px 0;
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
    border-radius: 50%;
}

.cta-title {
    font-size: 2.5rem;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.cta-description {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 700px;
    margin: 0 auto 40px;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 36px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1.1rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    gap: 10px;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.2);
}

.cta-note {
    margin-top: 30px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
}

/* 页脚 */
footer {
    background-color: rgba(15, 23, 42, 0.95);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-info {
    flex: 1;
    min-width: 300px;
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-description {
    color: var(--gray-light);
    max-width: 350px;
    line-height: 1.7;
}

.footer-links {
    display: flex;
    gap: 60px;
    flex-wrap: wrap;
}

.footer-column h4 {
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-column li {
    margin-bottom: 12px;
}

.footer-column a {
    color: var(--gray-light);
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--white);
    padding-left: 5px;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--gray);
    font-size: 0.9rem;
    line-height: 1.6;
}

.copyright a {
    color: var(--primary-light);
    margin-left: 10px;
}

.copyright a:hover {
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .section-title {
        font-size: 2.5rem;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .services {
        padding: 40px;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 15px 0;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--dark-light);
        flex-direction: column;
        padding: 20px;
        gap: 20px;
        box-shadow: var(--shadow);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero {
        padding: 150px 0 80px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .services {
        padding: 30px 20px;
    }
    
    .compliance {
        padding: 30px 20px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 40px;
    }
    
    .footer-links {
        gap: 40px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        gap: 30px;
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .process-steps {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}