:root {
    --page: #fbf8f4;
    --card: #fff;
    --ink: #241f1c;
    --muted: #6d635c;
    --line: #e6ded4;
    --accent: #b4654a;
    --body-width: 1080px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--page);
    color: var(--ink);
    font:
        16px/1.6 ui-sans-serif,
        -apple-system,
        'Segoe UI',
        Roboto,
        sans-serif;
}

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

.bar {
    background: var(--ink);
    color: #f6efe8;
    font-size: 13px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-align: center;
    padding: 9px 16px;
}

header {
    border-bottom: 1px solid var(--line);
    background: var(--card);
}

.shell {
    max-width: var(--body-width);
    margin: 0 auto;
    padding: 0 24px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
    height: 74px;
}

.brand {
    font-size: 21px;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-right: auto;
    white-space: nowrap;
}

.nav a {
    color: var(--ink);
    text-decoration: none;
    font-size: 15px;
    white-space: nowrap;
}

.nav a:hover {
    color: var(--accent);
}

.hero {
    padding: 48px 0 32px;
}

.hero h1 {
    font-size: clamp(28px, 4vw, 42px);
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin: 0 0 12px;
}

.hero p {
    color: var(--muted);
    max-width: 62ch;
    margin: 0;
}

.scenario {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background: var(--card);
    border: 1px solid var(--line);
    border-left: 4px solid var(--accent);
    border-radius: 8px;
    padding: 14px 18px;
    margin: 0 0 32px;
    font-size: 14px;
}

.scenario dl {
    margin: 0;
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 4px 14px;
}

.scenario dt {
    color: var(--muted);
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding-top: 2px;
}

.scenario dd {
    margin: 0;
}

.scenario code {
    background: #f4ede4;
    border-radius: 4px;
    padding: 1px 5px;
    font-size: 13px;
}

.rail {
    display: flex;
    gap: 40px;
    align-items: flex-start;
    padding-bottom: 64px;
}

.aside {
    flex: 0 0 220px;
    position: sticky;
    top: 24px;
    font-size: 15px;
}

.aside h2 {
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 12px;
}

.aside ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 9px;
}

.column {
    flex: 1 1 0;
    min-width: 0;
}

.column--clamped {
    max-width: 32.5em;
}

.filler {
    padding-bottom: 40px;
    color: var(--muted);
    max-width: 62ch;
}

footer {
    border-top: 1px solid var(--line);
    background: var(--card);
    padding: 36px 0;
    font-size: 14px;
    color: var(--muted);
}

.foot {
    display: flex;
    gap: 28px;
    flex-wrap: wrap;
    align-items: center;
}

.foot a {
    color: var(--muted);
}

.tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 24px;
}

.tabs button {
    font: inherit;
    font-size: 15px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 10px 14px;
    cursor: pointer;
    color: var(--muted);
}

.tabs button[aria-selected='true'] {
    color: var(--ink);
    border-bottom-color: var(--accent);
}

[role='tabpanel'][hidden] {
    display: none;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
    padding-bottom: 64px;
}

.grid article {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 18px 20px;
}

.grid h3 {
    margin: 0 0 6px;
    font-size: 17px;
}

.grid p {
    margin: 0 0 12px;
    color: var(--muted);
    font-size: 14px;
}

.grid a {
    font-size: 14px;
    font-weight: 500;
}