:root {
    color-scheme: light dark;

    --background: #f7f7fb;
    --surface: #ffffff;
    --text: #18181b;
    --muted: #666672;
    --border: #e4e4ea;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --success: #16803c;
    --max-width: 880px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #111114;
        --surface: #1b1b20;
        --text: #f4f4f5;
        --muted: #a1a1aa;
        --border: #313138;
        --primary: #818cf8;
        --primary-hover: #a5b4fc;
        --success: #4ade80;
    }
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family:
        Inter,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        sans-serif;
    line-height: 1.65;
}

main {
    width: min(calc(100% - 32px), var(--max-width));
    margin: 48px auto;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 40px;
}

.logo {
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--primary);
    text-decoration: none;
}

h1 {
    font-size: clamp(2rem, 6vw, 3.4rem);
    line-height: 1.08;
    letter-spacing: -0.04em;
    margin: 24px 0 16px;
}

h2 {
    margin-top: 40px;
    margin-bottom: 12px;
    font-size: 1.4rem;
    letter-spacing: -0.02em;
}

h3 {
    margin-top: 28px;
}

p,
li {
    color: var(--muted);
}

strong {
    color: var(--text);
}

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

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

.button {
    display: inline-block;
    margin-top: 12px;
    padding: 12px 18px;
    border-radius: 12px;
    background: var(--primary);
    color: white;
    text-decoration: none;
    font-weight: 600;
}

.button:hover {
    background: var(--primary-hover);
    color: white;
}

.badge {
    display: inline-block;
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 0.85rem;
    color: var(--muted);
}

hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 40px 0;
}

footer {
    margin-top: 32px;
    color: var(--muted);
    font-size: 0.9rem;
}

ul {
    padding-left: 22px;
}

.notice {
    border-left: 4px solid var(--primary);
    padding: 12px 18px;
    margin: 24px 0;
    background: var(--background);
    border-radius: 8px;
}

@media (max-width: 600px) {
    main {
        margin: 16px auto;
    }

    .card {
        padding: 24px;
        border-radius: 18px;
    }
}