* {
    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: #fff;
}

.header {
    background: #fff;
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #4285f4;
}

.logo span {
    color: #34a853;
}

.nav a {
    color: #5f6368;
    text-decoration: none;
    margin-left: 30px;
    font-size: 16px;
    transition: color 0.3s;
}

.nav a:hover {
    color: #4285f4;
}

.hero {
    text-align: center;
    padding: 80px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.9;
}

.download-btn {
    display: inline-block;
    background: #34a853;
    color: white;
    padding: 15px 40px;
    font-size: 18px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
}

.download-btn:hover {
    background: #2d9e47;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.3);
}

.features {
    max-width: 1200px;
    margin: 60px auto;
    padding: 0 20px;
}

.features h2 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 40px;
    color: #202124;
}

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

.feature-card {
    background: #f8f9fa;
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

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

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #202124;
}

.feature-card p {
    color: #5f6368;
    font-size: 16px;
}

.platforms {
    background: #f8f9fa;
    padding: 60px 20px;
    text-align: center;
}

.platforms h2 {
    font-size: 32px;
    margin-bottom: 30px;
    color: #202124;
}

.platform-icons {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    margin-top: 30px;
}

.platform-item {
    text-align: center;
    padding: 20px;
    background: white;
    border-radius: 8px;
    width: 120px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.platform-item .icon {
    font-size: 40px;
    margin-bottom: 10px;
}

.platform-item span {
    font-size: 14px;
    color: #5f6368;
}

.faq {
    max-width: 900px;
    margin: 60px auto;
    padding: 0 20px;
}

.faq h2 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 40px;
    color: #202124;
}

.faq-item {
    border-bottom: 1px solid #e0e0e0;
    margin-bottom: 10px;
}

.faq-question {
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    font-size: 18px;
    transition: background 0.3s;
}

.faq-question:hover {
    background: #f8f9fa;
}

.faq-question .toggle {
    font-size: 24px;
    font-weight: bold;
    color: #4285f4;
    transition: transform 0.3s;
}

.faq-item.active .faq-question .toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    padding: 0 20px;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding-bottom: 20px;
}

.faq-answer p {
    color: #5f6368;
    line-height: 1.8;
}

.footer {
    background: #202124;
    color: #9aa0a6;
    padding: 40px 20px;
    text-align: center;
}

.footer p {
    margin: 10px 0;
    font-size: 14px;
}

.footer a {
    color: #8ab4f8;
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 32px;
    }

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

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

    .platform-icons {
        gap: 20px;
    }

    .nav {
        display: none;
    }
}