:root {
    color-scheme: light dark;
    --background: #f5f8ff;
    --card: rgba(255, 255, 255, 0.82);
    --text: #172033;
    --secondary: #596579;
    --accent: #2878d8;
    --border: rgba(36, 91, 155, 0.14);
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #101521;
        --card: rgba(27, 35, 51, 0.9);
        --text: #f2f5fa;
        --secondary: #b1bbca;
        --accent: #73b5ff;
        --border: rgba(153, 194, 242, 0.18);
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(75, 151, 246, 0.18), transparent 42%),
        radial-gradient(circle at bottom right, rgba(255, 174, 75, 0.18), transparent 38%),
        var(--background);
    line-height: 1.6;
}

main,
nav,
footer {
    width: min(760px, calc(100% - 40px));
    margin-inline: auto;
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: 24px;
}

nav a,
footer a {
    color: var(--accent);
    text-decoration: none;
}

.brand {
    color: var(--text);
    font-weight: 750;
}

.links {
    display: flex;
    gap: 18px;
}

.hero {
    padding: 72px 0 48px;
    text-align: center;
}

.icon {
    display: grid;
    width: 88px;
    height: 88px;
    margin: 0 auto 24px;
    place-items: center;
    border-radius: 22px;
    background: linear-gradient(145deg, #397be5, #46b8e8);
    box-shadow: 0 18px 42px rgba(32, 104, 196, 0.28);
    color: white;
    font-size: 46px;
}

h1 {
    margin: 0;
    font-size: clamp(2.5rem, 8vw, 4.2rem);
    letter-spacing: -0.04em;
    line-height: 1.05;
}

h2 {
    margin-top: 0;
    font-size: 1.35rem;
}

.lead {
    max-width: 580px;
    margin: 20px auto 0;
    color: var(--secondary);
    font-size: 1.15rem;
}

.card {
    margin-bottom: 20px;
    padding: 28px;
    border: 1px solid var(--border);
    border-radius: 22px;
    background: var(--card);
    backdrop-filter: blur(20px);
    box-shadow: 0 16px 48px rgba(22, 48, 83, 0.08);
}

.features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.features .card {
    margin: 0;
}

ul {
    padding-left: 1.25rem;
}

a {
    color: var(--accent);
}

footer {
    padding-block: 42px;
    color: var(--secondary);
    font-size: 0.9rem;
    text-align: center;
}

@media (max-width: 600px) {
    .links {
        gap: 12px;
        font-size: 0.9rem;
    }

    .hero {
        padding-top: 42px;
    }

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