/* 重置样式 */
* {
    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: #ffffff;
}

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

/* 导航栏 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: #3b82f6;
    font-size: 24px;
    font-weight: 700;
}

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

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover {
    color: #3b82f6;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #3b82f6;
    transition: width 0.3s ease;
}

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

/* 主页横幅 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.9;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background: #ffffff;
    color: #3b82f6;
}

.btn-primary:hover {
    background: #f8fafc;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

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

.btn-secondary:hover {
    background: white;
    color: #3b82f6;
    transform: translateY(-2px);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-placeholder {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 40px;
    backdrop-filter: blur(10px);
    width: 400px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.audio-player {
    text-align: center;
    padding: 20px;
    width: 100%;
}

.audio-player audio {
    width: 100%;
    max-width: 350px;
    height: 50px;
    border-radius: 25px;
    outline: none;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.audio-player audio::-webkit-media-controls-panel {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 25px;
}

.audio-description {
    color: white;
    font-size: 16px;
    font-weight: 600;
    margin-top: 15px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* 功能特色 */
.features {
    padding: 100px 0;
    background: #f8fafc;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: #1e293b;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #1e293b;
}

.feature-card p {
    color: #64748b;
    line-height: 1.6;
}

/* 使用流程 */
.how-it-works {
    padding: 100px 0;
    background: white;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 60px;
    margin-top: 60px;
}

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

.step-number {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    margin: 0 auto 30px;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.step h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #1e293b;
}

.step p {
    color: #64748b;
    line-height: 1.6;
}

/* 体验区域 */
.experience {
    padding: 100px 0;
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
}

.experience-content {
    display: flex;
    justify-content: center;
    margin-top: 60px;
}

.qr-section {
    text-align: center;
    background: white;
    padding: 50px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    max-width: 400px;
}

.qr-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 30px;
    color: #1e293b;
}

.qr-code {
    margin-bottom: 20px;
}

.qr-image {
    width: 200px;
    height: 200px;
    border-radius: 15px;
    margin: 0 auto 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 2px solid #e0e0e0;
    background: white;
    padding: 10px;
    box-sizing: border-box;
}

.qr-description {
    color: #64748b;
    line-height: 1.6;
}

/* 页脚 */
.footer {
    background: #1e293b;
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: #3b82f6;
}

.footer-info p {
    color: #94a3b8;
    line-height: 1.6;
}

.footer-links h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
}

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #3b82f6;
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-copyright p,
.footer-icp p {
    color: #94a3b8;
    font-size: 0.9rem;
}

.footer-icp a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-icp a:hover {
    color: #3b82f6;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

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

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .steps {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .hero-buttons {
        justify-content: center;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}

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

    .nav-container {
        padding: 0 15px;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .features,
    .how-it-works,
    .experience {
        padding: 60px 0;
    }

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

    .qr-section {
        padding: 30px 20px;
    }

    .qr-image {
        width: 150px;
        height: 150px;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

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

.feature-card,
.step,
.qr-section {
    animation: fadeInUp 0.6s ease-out;
}

/* 加载动画延迟 */
.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: 0.1s; }
.step:nth-child(2) { animation-delay: 0.3s; }
.step:nth-child(3) { animation-delay: 0.5s; }