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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9fafb;
}

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

/* 顶部导航栏 */
.navbar {
    background: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.navbar-brand h1 {
    font-size: 24px;
    color: #1e40af;
    font-weight: 700;
}

.navbar-nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.navbar-nav a {
    text-decoration: none;
    color: #666;
    font-weight: 500;
    transition: color 0.3s;
}

.navbar-nav a:hover {
    color: #1e40af;
}

.btn-start {
    background: #1e40af;
    color: white;
    border: none;
    padding: 0.6rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s;
}

.btn-start:hover {
    background: #1e3a8a;
}

/* Hero区域 */
.hero {
    background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
    color: white;
    padding: 80px 20px;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 18px;
    margin-bottom: 1rem;
    opacity: 0.95;
    font-weight: 600;
}

.hero-desc {
    font-size: 16px;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn-primary {
    background: white;
    color: #1e40af;
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.hero-time {
    font-size: 14px;
    margin-top: 1.5rem;
    opacity: 0.85;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.brain-icon {
    font-size: 150px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* 信任指标区域 */
.trust {
    background: white;
    padding: 60px 20px;
}

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

.trust-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: #f9fafb;
    border-radius: 8px;
    border-left: 4px solid #1e40af;
}

.trust-icon {
    font-size: 28px;
    min-width: 40px;
}

.trust-text h4 {
    font-size: 20px;
    color: #1e40af;
    margin-bottom: 0.5rem;
}

.trust-text p {
    color: #666;
    font-size: 14px;
}

/* 产品特点区域 */
.features {
    padding: 80px 20px;
    background: white;
}

.section-title {
    font-size: 36px;
    text-align: center;
    margin-bottom: 3rem;
    color: #1e40af;
}

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

.feature-card {
    background: #f9fafb;
    padding: 2rem;
    border-radius: 8px;
    border-top: 4px solid #1e40af;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(30, 64, 175, 0.1);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 1rem;
}

.feature-card h4 {
    font-size: 18px;
    margin-bottom: 0.8rem;
    color: #1e40af;
}

.feature-card p {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
}

/* 测试流程区域 */
.process {
    background: #f9fafb;
    padding: 80px 20px;
}

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

.step {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    min-width: 200px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: #1e40af;
    color: white;
    border-radius: 50%;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step h4 {
    color: #1e40af;
    margin-bottom: 0.8rem;
}

.step p {
    color: #666;
    font-size: 14px;
    margin-bottom: 1rem;
}

.step-time {
    display: inline-block;
    background: #e0e7ff;
    color: #1e40af;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}

.step-arrow {
    font-size: 24px;
    color: #1e40af;
    font-weight: 700;
}

@media (max-width: 768px) {
    .process-steps {
        gap: 1rem;
    }
    .step-arrow {
        width: 100%;
        text-align: center;
    }
}

/* 科学原理区域 */
.science {
    background: white;
    padding: 80px 20px;
}

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

.science-item {
    padding: 2rem;
    background: #f9fafb;
    border-radius: 8px;
    border-left: 4px solid #1e40af;
}

.science-item h4 {
    color: #1e40af;
    margin-bottom: 1rem;
    font-size: 18px;
}

.science-item p {
    color: #666;
    line-height: 1.8;
    font-size: 14px;
}

/* 用户评价区域 */
.reviews {
    background: #f9fafb;
    padding: 80px 20px;
}

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

.review-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.stars {
    font-size: 16px;
    margin-bottom: 1rem;
}

.review-text {
    color: #333;
    margin-bottom: 1rem;
    font-size: 15px;
    line-height: 1.6;
    font-style: italic;
}

.review-author {
    color: #999;
    font-size: 12px;
}

/* FAQ区域 */
.faq {
    background: white;
    padding: 80px 20px;
}

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

.faq-item {
    margin-bottom: 2rem;
    padding: 2rem;
    background: #f9fafb;
    border-radius: 8px;
    border-left: 4px solid #1e40af;
}

.faq-item h4 {
    color: #1e40af;
    margin-bottom: 1rem;
    font-size: 16px;
}

.faq-item p {
    color: #666;
    line-height: 1.8;
    font-size: 14px;
}

/* 底部CTA */
.cta-final {
    background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
}

.cta-final h3 {
    font-size: 32px;
    margin-bottom: 1rem;
}

.cta-final p {
    font-size: 16px;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 18px;
}

.guarantee {
    font-size: 14px;
    margin-top: 1.5rem;
    opacity: 0.9;
}

/* 页脚 */
.footer {
    background: #1f2937;
    color: white;
    padding: 60px 20px 20px;
}

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

.footer-section h5 {
    font-size: 16px;
    margin-bottom: 1rem;
    color: #fff;
}

.footer-section p {
    color: #d1d5db;
    font-size: 14px;
    line-height: 1.8;
}

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

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

.footer-section ul li a {
    color: #d1d5db;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #9ca3af;
    font-size: 12px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .navbar .container {
        padding: 0.8rem 15px;
    }

    .navbar-brand h1 {
        font-size: 18px;
    }

    .navbar-nav {
        gap: 0.5rem;
        flex-wrap: wrap;
    }

    .navbar-nav a {
        font-size: 13px;
    }

    .btn-start {
        padding: 0.5rem 1rem;
        font-size: 12px;
    }

    .hero {
        padding: 60px 15px;
    }

    .hero .container {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }

    .hero-title {
        font-size: 32px;
        line-height: 1.3;
    }

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

    .hero-desc {
        font-size: 14px;
    }

    .hero-image {
        display: none;
    }

    .brain-icon {
        font-size: 100px;
    }

    .btn-primary {
        padding: 0.8rem 2rem;
        font-size: 14px;
        width: 100%;
    }

    .hero-time {
        font-size: 12px;
    }

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

    .trust-item {
        padding: 1.2rem;
    }

    .trust-icon {
        font-size: 24px;
    }

    .trust-text h4 {
        font-size: 16px;
    }

    .features,
    .process,
    .science,
    .reviews,
    .faq,
    .cta-final {
        padding: 60px 15px;
    }

    .section-title {
        font-size: 24px;
        margin-bottom: 2rem;
    }

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

    .feature-icon {
        font-size: 32px;
    }

    .feature-card h4 {
        font-size: 16px;
    }

    .feature-card p {
        font-size: 13px;
    }

    .process-steps {
        flex-direction: column;
        gap: 1.5rem;
    }

    .step {
        min-width: 100%;
        padding: 1.5rem;
    }

    .step-arrow {
        display: none;
    }

    .step-number {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }

    .step h4 {
        font-size: 14px;
    }

    .step p {
        font-size: 12px;
    }

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

    .science-item {
        padding: 1.5rem;
    }

    .science-item h4 {
        font-size: 16px;
    }

    .science-item p {
        font-size: 13px;
    }

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

    .review-card {
        padding: 1.5rem;
    }

    .review-text {
        font-size: 13px;
    }

    .review-author {
        font-size: 11px;
    }

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

    .faq-item {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .faq-item h4 {
        font-size: 14px;
    }

    .faq-item p {
        font-size: 12px;
    }

    .cta-final h3 {
        font-size: 22px;
        line-height: 1.3;
    }

    .cta-final p {
        font-size: 14px;
    }

    .btn-large {
        padding: 0.9rem 2rem;
        font-size: 14px;
        width: 100%;
    }

    .guarantee {
        font-size: 12px;
    }

    .footer {
        padding: 40px 15px 15px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        margin-bottom: 1.5rem;
    }

    .footer-section h5 {
        font-size: 14px;
    }

    .footer-section p,
    .footer-section a {
        font-size: 12px;
    }

    .footer-bottom {
        font-size: 10px;
    }
}