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

:root {
    --primary-color: #3B82F6;
    --secondary-color: #60A5FA;
    --success-color: #10B981;
    --text-color: #F3F4F6;
    --text-light: #9CA3AF;
    --bg-color: #0F172A;
    --bg-light: #1E293B;
    --border-color: #374151;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.7);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

button {
    cursor: pointer;
    border: none;
    font-family: inherit;
    transition: all 0.3s ease;
}

/* 导航栏 */
.navbar {
    background-color: var(--bg-color);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 70px;
    display: flex;
    align-items: center;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.nav-brand .logo {
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-color);
}

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

.nav-menu a {
    color: var(--text-color);
    font-weight: 500;
}

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

.nav-cta {
    background-color: var(--primary-color);
    color: white;
    padding: 10px 24px;
    border-radius: 6px;
    font-weight: 600;
    display: inline-block;
    text-decoration: none;
}

.nav-cta:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: 0.3s;
}

/* Banner 模块 */
.hero {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: white;
    padding: 160px 0 100px;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn-primary {
    background-color: white;
    color: var(--primary-color);
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    border: 2px solid var(--border-color);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    padding: 12px 28px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    border: 2px solid var(--primary-color);
    width: 100%;
}

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

.btn-large {
    padding: 16px 40px;
    font-size: 18px;
}

/* 数据展示模块 */
.stats {
    padding: 60px 0;
    background-color: var(--bg-color);
    margin-top: -40px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item {
    padding: 30px;
    background-color: var(--bg-light);
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.stat-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.stat-number {
    font-size: 42px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 16px;
    color: var(--text-light);
}

/* 功能特性模块 */
.features {
    padding: 100px 0;
    background-color: var(--bg-color);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 10px;
}

.section-header p {
    font-size: 16px;
    color: var(--text-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background-color: var(--bg-light);
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 56px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--text-light);
    font-size: 15px;
}

/* 应用场景模块 */
.scenarios {
    padding: 100px 0;
    background-color: var(--bg-color);
}

.tabs {
    max-width: 900px;
    margin: 0 auto;
}

.tab-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    background-color: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-color);
    flex: 1;
    min-width: 120px;
}

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

.tab-btn:hover:not(.active) {
    background-color: var(--border-color);
}

.tab-content {
    background-color: var(--bg-light);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 50px;
}

.tab-panel {
    display: none;
}

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

.scenario-content h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 15px;
}

.scenario-content p {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 30px;
}

.scenario-content ul {
    list-style: none;
}

.scenario-content li {
    font-size: 16px;
    color: var(--text-color);
    padding: 10px 0;
}

/* 用户评价模块 */
.testimonials {
    padding: 100px 0;
    background-color: var(--bg-color);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.testimonial-card {
    background-color: var(--bg-light);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

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

.testimonial-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: white;
}

.testimonial-info h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-color);
    color: var(--text-color);
}

.testimonial-info span {
    font-size: 14px;
    color: var(--text-light);
}

.testimonial-card p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.8;
}

/* 价格方案模块 */
.pricing {
    padding: 100px 0;
    background-color: var(--bg-color);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background-color: var(--bg-light);
    padding: 40px 30px;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow);
    border: 2px solid var(--border-color);
    text-align: center;
    transition: transform 0.3s ease;
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-8px);
}

.pricing-card.popular {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--success-color);
    color: white;
    padding: 5px 20px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.pricing-card h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 20px;
}

.pricing-card:hover {
    border-color: var(--primary-color);
}

.pricing-card.popular {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
}
}

.price {
    margin-bottom: 30px;
}

.price-value {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-color);
}

.price-period {
    font-size: 18px;
    color: var(--text-light);
}

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

.pricing-features li {
    padding: 12px 0;
    color: var(--text-color);
    font-size: 15px;
}

.pricing-card .btn-primary {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    padding: 14px 28px;
}

/* FAQ 模块 */
.faq {
    padding: 100px 0;
    background-color: var(--bg-color);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--bg-light);
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.faq-question {
    padding: 20px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    background-color: var(--bg-light);
}

.faq-question h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 18px;
    font-weight: 600;
    color: var(--text-color);
}

.faq-toggle {
    font-size: 24px;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 25px 20px;
    color: var(--text-light);
    font-size: 15px;
}

/* 底部CTA模块 */
.cta {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.cta h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 15px;
}

.cta p {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta .btn-primary {
    background-color: white;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.cta-note {
    font-size: 14px;
    opacity: 0.8;
}

/* 页脚 */
.footer {
    background-color: #0b1120;
    color: white;
    padding: 60px 0 20px;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-color);
}

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

.footer-section li {
    padding: 8px 0;
}

.footer-section a {
    color: #9CA3AF;
    font-size: 14px;
}

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

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    text-align: center;
    color: var(--text-light);
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 36px;
    }

    .stats-grid,
    .features-grid,
    .testimonials-grid,
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-menu {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .nav-cta {
        display: none;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 120px 0 60px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero p {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
        padding: 0 40px;
    }

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

    .features-grid,
    .testimonials-grid,
    .pricing-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

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

    .section-header h2 {
        font-size: 28px;
    }

    .tab-content {
        padding: 30px 20px;
    }

    .pricing-card {
        padding: 30px 20px;
    }
}

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

    .hero h1 {
        font-size: 24px;
    }

    .stat-number {
        font-size: 32px;
    }

    .cta h2 {
        font-size: 28px;
    }
}

/* 移动端导航激活状态 */
.navbar.active .nav-menu {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background-color: white;
    padding: 20px;
    box-shadow: var(--shadow);
    gap: 15px;
}