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

:root {
    --primary-color: #5B8FF9;
    --secondary-color: #9370DB;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --gradient: linear-gradient(135deg, #5B8FF9 0%, #9370DB 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-light);
}

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

/* Header */
.header {
    background: var(--gradient);
    color: white;
    padding: 60px 20px;
    text-align: center;
}

.logo-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 16px;
}

.logo {
    width: 80px;
    height: 80px;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.title h1 {
    font-size: 48px;
    font-weight: 700;
    margin: 0;
    letter-spacing: 2px;
}

.subtitle {
    font-size: 18px;
    opacity: 0.95;
    font-weight: 300;
}

.tagline {
    font-size: 20px;
    opacity: 0.9;
    font-weight: 300;
    letter-spacing: 1px;
}

/* Hero Section */
.hero {
    background: var(--bg-white);
    padding: 80px 20px;
    text-align: center;
}

.hero-title {
    font-size: 36px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.hero-description {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 40px;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

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

.download-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.download-btn.secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-icon {
    width: 24px;
    height: 24px;
}

/* Features Section */
.features {
    padding: 80px 20px;
    background: var(--bg-light);
}

.section-title {
    font-size: 32px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-dark);
}

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

.feature-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    font-weight: 700;
}

.text-icon {
    background: linear-gradient(135deg, #5B8FF9 0%, #61BFFF 100%);
    color: white;
}

.doc-icon, .voice-icon, .image-icon {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    font-size: 40px;
}

.feature-card h4 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.6;
}

/* Highlights Section */
.highlights {
    padding: 80px 20px;
    background: var(--bg-white);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.highlight-item {
    text-align: center;
}

.highlight-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.highlight-item h5 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.highlight-item p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.6;
}

/* CTA Section */
.cta {
    padding: 80px 20px;
    background: var(--gradient);
    color: white;
    text-align: center;
}

.cta h3 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 16px;
}

.cta p {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.95;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 30px 20px;
    text-align: center;
}

.footer p {
    opacity: 0.8;
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 40px 20px;
    }

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

    .title h1 {
        font-size: 36px;
    }

    .subtitle {
        font-size: 16px;
    }

    .tagline {
        font-size: 16px;
    }

    .hero {
        padding: 60px 20px;
    }

    .hero-title {
        font-size: 28px;
    }

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

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

    .features, .highlights, .cta {
        padding: 60px 20px;
    }

    .feature-grid, .highlights-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .download-btn {
        padding: 14px 32px;
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .logo-section {
        flex-direction: column;
        gap: 10px;
    }

    .title h1 {
        font-size: 28px;
    }

    .hero-title {
        font-size: 24px;
    }

    .cta h3 {
        font-size: 24px;
    }
}