:root {
    color-scheme: light dark;
    --bg: #f5f7fa;
    --surface: #ffffff;
    --text: #142033;
    --muted: #5d6878;
    --line: #d9e0e8;
    --accent: #1479c9;
    --accent-soft: #e9f4fc;
    --warning: #8a5a00;
    --warning-bg: #fff5d8;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b111a;
        --surface: #121c29;
        --text: #f4f7fb;
        --muted: #aeb9c8;
        --line: #2a394b;
        --accent: #58b7f5;
        --accent-soft: #112c40;
        --warning: #ffd36b;
        --warning-bg: #302612;
    }
}

* {
    box-sizing: border-box;
}

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

header,
main,
footer {
    width: min(860px, calc(100% - 32px));
    margin: 0 auto;
}

header {
    padding: 28px 0 18px;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 18px;
    align-items: center;
}

nav strong {
    margin-right: auto;
    font-size: 1.1rem;
}

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

nav a {
    font-weight: 650;
    text-decoration: none;
}

main {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: clamp(24px, 5vw, 52px);
}

h1 {
    margin: 0 0 8px;
    font-size: clamp(2rem, 6vw, 3rem);
    line-height: 1.12;
}

h2 {
    margin-top: 2rem;
    font-size: 1.35rem;
    line-height: 1.3;
}

h3 {
    margin-top: 1.4rem;
    font-size: 1.05rem;
}

p,
li {
    max-width: 74ch;
}

.meta {
    margin: 0 0 2rem;
    color: var(--muted);
}

.notice {
    margin: 1.4rem 0;
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-left: 4px solid var(--accent);
    border-radius: 6px;
    background: var(--accent-soft);
}

.warning {
    color: var(--warning);
    background: var(--warning-bg);
    border-left-color: var(--warning);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.button {
    display: inline-block;
    padding: 11px 16px;
    border-radius: 6px;
    background: var(--accent);
    color: #ffffff;
    font-weight: 700;
    text-decoration: none;
}

footer {
    padding: 22px 0 36px;
    color: var(--muted);
    font-size: 0.9rem;
}

code {
    overflow-wrap: anywhere;
}

@media (max-width: 560px) {
    header {
        padding-top: 20px;
    }

    nav strong {
        width: 100%;
    }
}