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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: #333;
    line-height: 1.6;
    background-color: #fff;
}

/* =============== 导航栏 =============== */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-menu a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
}

.nav-menu a:hover {
    opacity: 0.8;
}

.nav-btn-login {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid white;
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

.nav-btn-login:hover {
    background: white;
    color: #667eea;
}

/* =============== Hero 区 =============== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 80px 2rem;
    min-height: 600px;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
    align-items: center;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    line-height: 1.6;
}

.hero-ctas {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.hero-trust {
    font-size: 0.95rem;
    opacity: 0.9;
}

.hero-image {
    display: none;
}

.hero-image-placeholder {
    display: none;
}

/* =============== 按钮样式 =============== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 107, 107, 0.4);
}

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

.btn-secondary:hover {
    background: white;
    color: #667eea;
}

.btn-outline {
    background: white;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-outline:hover {
    background: #f0f0f0;
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-xl {
    padding: 1.5rem 4.5rem;
    font-size: 1.3rem;
    letter-spacing: 0.5px;
}

/* =============== 问题-解决方案区 =============== */
.problem-solution {
    padding: 80px 2rem;
    background: #f8f9fa;
}

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

.ps-container h2 {
    font-size: 2.5rem;
    margin-bottom: 4rem;
    text-align: center;
    color: #333;
}

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

.ps-item {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.ps-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.ps-item i {
    font-size: 2.5rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.ps-item h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #333;
}

.ps-item p {
    color: #666;
    line-height: 1.6;
}

/* =============== 功能区 =============== */
.features {
    padding: 80px 2rem;
    background: white;
}

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

.features-container h2 {
    font-size: 2.5rem;
    margin-bottom: 4rem;
    text-align: center;
    color: #333;
}

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

.feature-card {
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    padding: 2.5rem 2rem;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(102, 126, 234, 0.15);
    border-color: rgba(102, 126, 234, 0.3);
}

.feature-icon {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #333;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* =============== 使用流程 =============== */
.how-it-works {
    padding: 80px 2rem;
    background: linear-gradient(135deg, #667eea10 0%, #764ba210 100%);
}

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

.how-container h2 {
    font-size: 2.5rem;
    margin-bottom: 4rem;
    text-align: center;
    color: #333;
}

.steps {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.step {
    flex: 1;
    min-width: 200px;
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: bold;
    margin: 0 auto 1rem;
}

.step h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.step p {
    color: #666;
    font-size: 0.95rem;
}

.step-arrow {
    font-size: 2rem;
    color: #667eea;
    flex: 0 0 auto;
}

/* =============== 定价区 =============== */
.pricing {
    padding: 80px 2rem;
    background: #f8f9fa;
}

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

.pricing-container h2 {
    font-size: 2.5rem;
    margin-bottom: 4rem;
    text-align: center;
    color: #333;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.pricing-card {
    background: white;
    padding: 2.5rem 2rem;
    border-radius: 12px;
    border: 1px solid #e0e0e0;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.pricing-card:hover {
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.pricing-card.featured {
    border: 2px solid #667eea;
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.15);
}

.badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.pricing-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: #333;
}

.price {
    font-size: 2rem;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 2rem;
}

.currency {
    font-size: 1.2rem;
}

.amount {
    font-size: 2.5rem;
}

.period {
    font-size: 0.9rem;
    color: #666;
    margin-left: 0.5rem;
}

.features-list {
    list-style: none;
    text-align: left;
    margin: 2rem 0;
    min-height: 180px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.features-list li {
    padding: 0.7rem 0;
    color: #666;
    border-bottom: 1px solid #f0f0f0;
}

.features-list i {
    color: #667eea;
    margin-right: 0.8rem;
    font-weight: bold;
}

.features-list i.fa-times {
    color: #ccc;
}

.pricing-card .btn {
    width: 100%;
    margin-top: 1.5rem;
}

/* =============== 社会证明 =============== */
.social-proof {
    padding: 80px 2rem;
    background: white;
}

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

.social-proof h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: #333;
}

.proof-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
    text-align: center;
}

.stat {
    padding: 2rem;
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    border-radius: 12px;
}

.stat h3 {
    font-size: 2.5rem;
    color: #667eea;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.stat p {
    color: #666;
    font-size: 1rem;
}

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

.testimonial {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.stars {
    color: #ffc107;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.testimonial p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
    font-style: italic;
}

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

.author strong {
    color: #333;
}

.author span {
    color: #999;
    font-size: 0.9rem;
}

/* =============== FAQ =============== */
.faq {
    padding: 80px 2rem;
    background: #f8f9fa;
}

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

.faq h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: #333;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    margin-bottom: 1rem;
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    background: white;
    width: 100%;
    text-align: left;
    font-size: 1.1rem;
    color: #333;
    transition: all 0.3s ease;
    user-select: none;
    font-weight: 500;
    list-style: none;
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question::before {
    content: '▼';
    display: inline-block;
    margin-right: 1rem;
    transition: transform 0.3s ease;
    color: #667eea;
    font-weight: bold;
}

.faq-item[open] .faq-question {
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    color: #667eea;
}

.faq-item[open] .faq-question::before {
    transform: rotate(180deg);
}

.faq-question:hover {
    background: #f8f9fa;
}

.faq-answer {
    padding: 0 1.5rem 1.5rem 1.5rem;
    color: #666;
    background: white;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

details .faq-answer {
    display: block !important;
}

/* =============== 底部CTA =============== */
.cta-bottom {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 2rem;
    text-align: center;
}

.cta-container {
    max-width: 800px;
    margin: 0 auto;
}

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

.cta-bottom p {
    font-size: 1.2rem;
    margin-bottom: 3rem;
    opacity: 0.95;
}

/* =============== Footer =============== */
.footer {
    background: #1a1a1a;
    color: #999;
    padding: 4rem 2rem 1rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto 2rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

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

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

.footer-section ul li {
    margin-bottom: 0.8rem;
}

.footer-section a {
    color: #999;
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid #333;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    color: #666;
}

.social-links {
    display: none;
}

.social-links a {
    color: #999;
    font-size: 1.3rem;
    transition: color 0.3s;
}

.social-links a:hover {
    color: #667eea;
}

/* =============== 响应式设计 =============== */
@media (max-width: 1024px) {
    .nav-menu {
        gap: 1rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

@media (max-width: 768px) {
    /* =============== 导航栏移动优化 =============== */
    .nav-container {
        padding: 1rem;
    }

    .logo {
        font-size: 1.2rem;
    }

    .nav-menu {
        display: none;
    }

    /* =============== Hero 区移动优化 =============== */
    .hero {
        padding: 60px 1.5rem;
        min-height: auto;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero-title {
        font-size: 1.8rem;
        margin-bottom: 1rem;
    }

    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }

    .hero-ctas {
        flex-direction: column;
        gap: 0.8rem;
    }

    .btn-lg {
        padding: 0.9rem 1.8rem;
        font-size: 0.95rem;
        width: 100%;
    }

    .hero-trust {
        font-size: 0.85rem;
    }

    /* =============== 问题-解决方案区移动优化 =============== */
    .problem-solution {
        padding: 60px 1.5rem;
    }

    .ps-container h2 {
        font-size: 1.6rem;
        margin-bottom: 2rem;
    }

    .ps-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .ps-item {
        padding: 1.5rem;
    }

    .ps-item i {
        font-size: 2rem;
    }

    /* =============== 功能区移动优化 =============== */
    .features {
        padding: 60px 1.5rem;
    }

    .features-container h2 {
        font-size: 1.6rem;
        margin-bottom: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .feature-card {
        padding: 2rem 1.5rem;
    }

    .feature-icon {
        font-size: 2.5rem;
    }

    /* =============== 使用流程移动优化 =============== */
    .how-it-works {
        padding: 60px 1.5rem;
    }

    .how-container h2 {
        font-size: 1.6rem;
        margin-bottom: 2rem;
    }

    .steps {
        flex-direction: column;
        gap: 1rem;
    }

    .step {
        flex: 1;
        min-width: auto;
    }

    .step-arrow {
        transform: rotate(90deg);
        margin: 0.5rem 0;
    }

    /* =============== 社会证明移动优化 =============== */
    .social-proof {
        padding: 60px 1.5rem;
    }

    .social-proof h2 {
        font-size: 1.6rem;
        margin-bottom: 2rem;
    }

    .proof-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        margin-bottom: 2rem;
    }

    .stat {
        padding: 1.5rem;
    }

    .stat h3 {
        font-size: 2rem;
    }

    .testimonials {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .testimonial {
        padding: 1.5rem;
    }

    /* =============== FAQ移动优化 =============== */
    .faq {
        padding: 60px 1.5rem;
    }

    .faq-container {
        max-width: 100%;
    }

    .faq h2 {
        font-size: 1.6rem;
        margin-bottom: 2rem;
    }

    .faq-question {
        padding: 1.2rem;
        font-size: 1rem;
    }

    .faq-answer {
        padding: 0 1.2rem 1.2rem 1.2rem;
        font-size: 0.95rem;
    }

    /* =============== 底部CTA移动优化 =============== */
    .cta-bottom {
        padding: 60px 1.5rem;
    }

    .cta-container {
        max-width: 100%;
    }

    .cta-bottom h2 {
        font-size: 1.6rem;
        margin-bottom: 1rem;
    }

    .cta-bottom p {
        font-size: 1rem;
        margin-bottom: 2rem;
    }

    .btn-xl {
        padding: 1rem 2rem;
        font-size: 1rem;
        width: 100%;
    }

    /* =============== Footer移动优化 =============== */
    .footer {
        padding: 2rem 1.5rem 1rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .footer-section h4 {
        font-size: 0.95rem;
    }

    .footer-section ul li {
        margin-bottom: 0.6rem;
        font-size: 0.9rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
        padding-top: 1.5rem;
    }

    .footer-bottom p {
        font-size: 0.85rem;
    }

    h1, h2, h3 {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    /* =============== 超小屏幕优化 =============== */
    .nav-container {
        padding: 0.8rem;
    }

    .logo {
        font-size: 1rem;
    }

    .hero {
        padding: 40px 1rem;
    }

    .hero-title {
        font-size: 1.5rem;
        line-height: 1.3;
    }

    .hero-subtitle {
        font-size: 0.9rem;
        line-height: 1.5;
    }

    .btn-lg {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }

    .hero-trust {
        font-size: 0.75rem;
    }

    .problem-solution,
    .features,
    .how-it-works,
    .social-proof,
    .faq,
    .cta-bottom {
        padding: 40px 1rem;
    }

    .ps-container h2,
    .features-container h2,
    .how-container h2,
    .social-proof h2,
    .faq h2,
    .cta-bottom h2 {
        font-size: 1.4rem;
        margin-bottom: 1.5rem;
    }

    .ps-item,
    .feature-card {
        padding: 1.2rem;
    }

    .ps-item i,
    .feature-icon {
        font-size: 1.8rem;
        margin-bottom: 0.8rem;
    }

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

    .stat {
        padding: 1.2rem;
    }

    .stat h3 {
        font-size: 1.6rem;
    }

    .stat p {
        font-size: 0.85rem;
    }

    .testimonial {
        padding: 1.2rem;
    }

    .testimonial p {
        font-size: 0.9rem;
    }

    .faq-question {
        padding: 1rem;
        font-size: 0.95rem;
    }

    .faq-question::before {
        margin-right: 0.8rem;
    }

    .faq-answer {
        padding: 0 1rem 1rem 1rem;
        font-size: 0.9rem;
    }

    .btn-xl {
        padding: 0.9rem 1.5rem;
        font-size: 0.95rem;
    }

    .cta-bottom p {
        font-size: 0.9rem;
        margin-bottom: 1.5rem;
    }

    .footer-content {
        gap: 1rem;
        margin-bottom: 1rem;
    }

    .footer-section h4 {
        font-size: 0.9rem;
        margin-bottom: 0.8rem;
    }

    .footer-section ul li {
        margin-bottom: 0.5rem;
        font-size: 0.85rem;
    }

    .footer-bottom p {
        font-size: 0.8rem;
    }

    h1, h2 {
        font-size: 1.5rem;
    }
}