:root {
    --blue: #3478F6;
    --blue-light: #5A9CF6;
    --blue-dark: #1a5ad4;
    --bg: #f5f7fa;
    --bg-card: #ffffff;
    --text-primary: #1a2233;
    --text-secondary: #5f6b7a;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Hero */

.hero {
    text-align: center;
    padding: 5rem 1.5rem 4rem;
    background: linear-gradient(180deg, #2a6af0 0%, #3478F6 50%, #5A9CF6 100%);
    color: #fff;
}

.hero-icon {
    width: 148px;
    height: 148px;
    border-radius: 22.5%;
    margin-bottom: 1.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.25rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 1.25rem;
}

.hero-description {
    max-width: 520px;
    margin: 0 auto 2rem;
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.05rem;
}

.app-store-badge {
    display: inline-block;
    transition: opacity 0.2s;
}

.app-store-badge:hover {
    opacity: 0.85;
}

.app-store-badge img {
    height: 54px;
}

.hero-platforms {
    margin-top: 0.75rem;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
}

/* Features */

.features {
    padding: 4rem 1.5rem;
    max-width: 860px;
    margin: 0 auto;
}

.features h2 {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 2.5rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

.feature-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 0.925rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Privacy */

.privacy {
    text-align: center;
    padding: 3.5rem 1.5rem;
    max-width: 560px;
    margin: 0 auto;
}

.privacy h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.privacy p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* Support */

.support {
    text-align: center;
    padding: 2rem 1.5rem 3rem;
}

.support h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.support a {
    color: var(--blue);
    text-decoration: none;
}

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

/* Footer */

footer {
    text-align: center;
    padding: 2rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

footer a:hover {
    color: var(--text-primary);
}

/* Responsive */

@media (max-width: 768px) {
    .hero {
        padding: 3.5rem 1.25rem 3rem;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

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

    .features {
        padding: 3rem 1.25rem;
    }

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