/* 简约现代风格 CSS */
:root {
    --primary-color: #4f46e5;
    --secondary-color: #7c3aed;
    --text-color: #1f2937;
    --light-text: #6b7280;
    --background: #ffffff;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
}

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

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background);
}

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

/* 导航栏 */
.navbar {
    background: var(--card-bg);
    box-shadow: 0 2px 10px 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: 15px 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #f3f4f6, #e5e7eb);
    padding: 80px 0;
    text-align: center;
}

.hero-content {
    max-width: 600px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    color: var(--text-color);
    opacity: 0.8;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 30px;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

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

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

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.hero-image {
    margin-top: 50px;
}

.hero-image img {
    max-width: 300px;
    border-radius: 15px;
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

/* 功能区域 */
.features {
    padding: 80px 0;
    background: var(--background);
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: var(--text-color);
    position: relative;
}

.features h2::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    text-align: center;
    padding: 40px 20px;
    background: var(--card-bg);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.icon {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-color);
    font-weight: 600;
}

.feature-card p {
    color: var(--light-text);
    line-height: 1.8;
}

/* 使用流程 */
.how-it-works {
    padding: 80px 0;
    background: #f9fafb;
}

.how-it-works h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: var(--text-color);
}

.steps {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    flex: 1;
    min-width: 200px;
    text-align: center;
    padding: 30px;
    background: var(--card-bg);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.step:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: bold;
    margin: 0 auto 20px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.step h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-color);
    font-weight: 600;
}

.step p {
    color: var(--light-text);
}

/* 用户评价 */
.testimonials {
    padding: 80px 0;
    background: var(--card-bg);
}

.testimonials h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: var(--text-color);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.testimonial {
    background: #f9fafb;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    text-align: center;
    transition: all 0.3s ease;
}

.testimonial:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.testimonial p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 20px;
    position: relative;
    padding-left: 30px;
}

.testimonial p::before {
    content: '"';
    font-size: 4rem;
    position: absolute;
    left: 0;
    top: -20px;
    color: var(--primary-color);
    opacity: 0.3;
}

.author {
    font-weight: 600;
    color: var(--primary-color);
}

/* 页脚 */
footer {
    background: #1f2937;
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: bold;
}

.footer-links {
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icons a {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
}

.social-icons a:hover {
    background: rgba(255,255,255,0.2);
}

.copyright {
    text-align: center;
    padding-top: 30px;
    color: #6b7280;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        flex-direction: column;
    }
}

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

.feature-card, .step, .testimonial {
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
}

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

.step:nth-child(1) { animation-delay: 0.5s; }
.step:nth-child(2) { animation-delay: 0.6s; }
.step:nth-child(3) { animation-delay: 0.7s; }
.step:nth-child(4) { animation-delay: 0.8s; }

.testimonial:nth-child(1) { animation-delay: 0.9s; }
.testimonial:nth-child(2) { animation-delay: 1s; }
.testimonial:nth-child(3) { animation-delay: 1.1s; }