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

:root {
    --primary-color: #00C853;
    --primary-dark: #00A843;
    --primary-light: #69F0AE;
    --bg-color: #FFFFFF;
    --bg-gray: #F5F7FA;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --border-color: #EEEEEE;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
}

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

.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
}

.header-content {
    position: relative;
    z-index: 1;
}

.logo {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    background: white;
    margin-bottom: 20px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.app-name {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.app-slogan {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 30px;
}

.download-btn {
    display: inline-block;
    background: white;
    color: var(--primary-color);
    padding: 14px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    position: relative;
    z-index: 1;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.intro {
    padding: 60px 0;
    background: var(--bg-gray);
}

.section-title {
    text-align: center;
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 40px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

.intro-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.intro-text p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    text-align: justify;
}

.intro-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature-item {
    background: white;
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 32px;
    display: block;
    margin-bottom: 10px;
}

.feature-text {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.advantages {
    padding: 60px 0;
    background: white;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.advantage-card {
    background: var(--bg-gray);
    padding: 35px;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.advantage-card:hover {
    background: white;
    border-color: var(--primary-color);
    transform: translateY(-8px);
    box-shadow: 0 10px 30px rgba(0,200,83,0.15);
}

.card-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.card-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.user-reviews {
    padding: 60px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.user-reviews .section-title {
    color: white;
}

.user-reviews .section-title::after {
    background: white;
}

.reviews-slider {
    display: flex;
    gap: 30px;
    overflow: hidden;
    scroll-behavior: smooth;
    padding: 20px 0;
}

.review-card {
    flex: 0 0 calc(33.333% - 20px);
    background: white;
    color: var(--text-primary);
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.reviewer-info {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.reviewer-avatar {
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-right: 15px;
}

.reviewer-name {
    font-size: 16px;
    font-weight: 600;
    display: block;
}

.reviewer-rating {
    font-size: 14px;
    color: #FFD700;
}

.review-content {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 15px;
}

.review-date {
    font-size: 12px;
    color: var(--text-light);
}

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

.prev-btn, .next-btn {
    width: 45px;
    height: 45px;
    background: rgba(255,255,255,0.2);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.prev-btn:hover, .next-btn:hover {
    background: rgba(255,255,255,0.4);
    transform: scale(1.1);
}

.download-section {
    padding: 80px 0;
    background: white;
    text-align: center;
}

.download-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.download-desc {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.download-btn-large {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 18px 60px;
    border-radius: 40px;
    text-decoration: none;
    font-size: 22px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 6px 25px rgba(0,200,83,0.4);
}

.download-btn-large:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 35px rgba(0,200,83,0.5);
}

.download-hint {
    font-size: 14px;
    color: var(--text-light);
    margin-top: 20px;
}

.footer {
    background: #333333;
    color: #999999;
    padding: 30px 0;
    text-align: center;
}

.footer-text {
    font-size: 14px;
    margin-bottom: 5px;
}

.footer-version {
    font-size: 12px;
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.btn-pressed {
    transform: scale(0.95) !important;
}

@media screen and (max-width: 768px) {
    .header {
        padding: 40px 0;
    }

    .app-name {
        font-size: 28px;
    }

    .app-slogan {
        font-size: 16px;
    }

    .download-btn {
        padding: 12px 30px;
        font-size: 16px;
    }

    .section-title {
        font-size: 26px;
    }

    .intro {
        padding: 40px 0;
    }

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

    .advantages {
        padding: 40px 0;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .user-reviews {
        padding: 40px 0;
    }

    .reviews-slider {
        flex-direction: column;
        gap: 20px;
    }

    .review-card {
        flex: 0 0 100%;
    }

    .download-section {
        padding: 60px 0;
    }

    .download-title {
        font-size: 26px;
    }

    .download-btn-large {
        padding: 16px 45px;
        font-size: 20px;
    }
}

@media screen and (max-width: 480px) {
    .header {
        padding: 30px 0;
    }

    .app-name {
        font-size: 24px;
    }

    .logo {
        width: 60px;
        height: 60px;
    }

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

    .feature-item {
        padding: 20px;
    }

    .download-btn-large {
        padding: 14px 35px;
        font-size: 18px;
    }
}