/* Hallmark · macrostructure: Long Document · genre: editorial · tone: technical
 * design-system: DESIGN.md / existing dark website variant
 * pre-emit critique: Philosophy 4 · Hierarchy 5 · Execution 4 · Specificity 4 · Restraint 5 · Variety 4
 */
html.feature-document { overflow-x: clip; scroll-behavior: smooth; }
.feature-page {
    --feature-surface: #171412;
    --feature-rule: #342e29;
    --feature-rule-strong: #554638;
    --feature-ink: #f5f1e9;
    --feature-muted: #b8afa5;
    --feature-accent: #e3a900;
    --feature-space-sm: 1rem;
    --feature-space-md: 1.5rem;
    --feature-space-lg: 2rem;
    --feature-space-xl: 3rem;
    --feature-space-2xl: 4rem;
    --feature-space-3xl: 5rem;
    background: var(--color-bg-depth);
    color: var(--feature-ink);
    overflow-x: clip;
    min-height: 100vh;
    font-family: var(--font-body);
}
.feature-shell { width: min(100% - 4rem, 1200px); margin-inline: auto; }
.feature-page a { text-decoration: none; transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease; }
.feature-page a:hover { color: var(--feature-accent); }
.feature-page a:active { color: var(--feature-ink); }
.feature-page a:focus-visible { outline: 2px solid var(--feature-accent); outline-offset: 6px; }
.feature-page a[aria-disabled="true"] { opacity: .45; pointer-events: none; }
.feature-skip { position: fixed; left: 1rem; top: -6rem; padding: 1rem; z-index: 10; background: var(--feature-surface); }
.feature-skip:focus { top: 1rem; }
.feature-topbar { border-bottom: 1px solid var(--feature-rule); }
.feature-topbar-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--feature-space-lg); min-height: 88px; }
.feature-wordmark { font: 700 1.5rem var(--font-display); letter-spacing: -.05em; }
.feature-wordmark span { color: var(--feature-accent); margin-left: .3em; }
.feature-back { color: var(--feature-muted); font-size: 1rem; display: inline-flex; align-items: center; gap: .75rem; }
.feature-back i { font-size: .7rem; }
.feature-hero { display: flex; align-items: center; justify-content: space-between; gap: var(--feature-space-2xl); padding-block: var(--feature-space-3xl); border-bottom: 1px solid var(--feature-rule-strong); }
.feature-hero-copy { min-width: 0; max-width: 850px; }
.feature-eyebrow { display: flex; align-items: center; flex-wrap: wrap; gap: var(--feature-space-sm); margin-bottom: var(--feature-space-md); color: var(--feature-muted); font-size: .9rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.feature-status { padding: .25rem .75rem; border: 1px solid var(--feature-rule-strong); color: var(--feature-accent); border-radius: 4px; font-size: .75rem; letter-spacing: .08em; }
.feature-hero h1 { font: 600 clamp(2.5rem, 4.8vw, 4.25rem)/1.12 var(--font-display); letter-spacing: -.045em; margin: 0; text-wrap: balance; }
.feature-intro { font-size: 1.375rem; line-height: 1.5; color: var(--feature-muted); max-width: 58ch; margin: var(--feature-space-md) 0 0; }
.feature-emblem { flex: 0 0 152px; aspect-ratio: 1; display: grid; place-items: center; color: var(--feature-rule-strong); font-size: 5rem; border: 1px solid var(--feature-rule); border-radius: 4px; background: var(--feature-surface); }
.feature-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: var(--feature-space-3xl); padding-block: var(--feature-space-2xl) var(--feature-space-3xl); align-items: start; }
.feature-sidebar { position: sticky; top: var(--feature-space-lg); }
.feature-sidebar h2 { font-size: .75rem; text-transform: uppercase; letter-spacing: .16em; color: var(--feature-muted); margin: 0 0 var(--feature-space-sm); font-weight: 600; }
.feature-section-link { display: block; padding: .625rem 0 .625rem var(--feature-space-sm); border-left: 1px solid var(--feature-rule); color: var(--feature-muted); font-size: 1.0625rem; line-height: 1.4; }
.feature-section-link:hover { border-left-color: var(--feature-accent); background: var(--feature-surface); }
.feature-resources { margin-top: var(--feature-space-lg); padding-top: var(--feature-space-md); border-top: 1px solid var(--feature-rule); display: grid; gap: var(--feature-space-sm); }
.feature-resources a { display: flex; justify-content: space-between; align-items: center; gap: .75rem; color: var(--feature-muted); font-size: 1rem; }
.feature-resources .feature-doc-link { color: var(--feature-ink); }
.feature-resources i { font-size: .625rem; }
.feature-body { min-width: 0; }
.feature-page .docs-section { max-width: 72ch; }
.feature-page .article-section { margin: 0 0 var(--feature-space-xl); padding-bottom: var(--feature-space-xl); border-bottom: 1px solid var(--feature-rule); scroll-margin-top: var(--feature-space-lg); }
.feature-page .article-section:last-of-type { margin-bottom: 0; padding-bottom: 0; border-bottom: 0; }
.feature-page .article-section:target h2 { color: var(--feature-accent); }
.feature-page .docs-section h2 { font: 600 1.5rem/1.3 var(--font-display); letter-spacing: -.02em; color: var(--feature-ink); margin-bottom: var(--feature-space-md); }
.feature-page .docs-section p, .feature-page .docs-section li { font-size: 1.125rem; line-height: 1.7; color: var(--feature-muted); }
.feature-page .docs-section p:last-child { margin-bottom: 0; }
.feature-page .docs-section ul { padding-left: 1.25rem; }
.feature-page .docs-section li { padding-left: .375rem; margin-top: .75rem; }
.feature-page .docs-section li::marker { color: var(--feature-accent); }
.feature-page .docs-section a { color: var(--feature-accent); }
.feature-page .code-block { margin-top: var(--feature-space-md); }
.feature-page .docs-section pre { max-width: 100%; border: 1px solid var(--feature-rule); border-left: 2px solid var(--feature-accent); border-radius: 4px; padding: var(--feature-space-md); background: var(--feature-surface); color: var(--feature-ink); font-size: .8125rem; line-height: 1.8; overflow-x: auto; }
.feature-footer { border-top: 1px solid var(--feature-rule); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--feature-space-md); padding-block: var(--feature-space-lg); color: var(--feature-muted); font-size: .9375rem; }
.feature-footer a { color: var(--feature-ink); display: inline-flex; gap: 1rem; align-items: center; }
.feature-footer i { font-size: .625rem; }
@media (max-width: 900px) {
    .feature-hero { gap: var(--feature-space-lg); padding-block: var(--feature-space-xl); }
    .feature-emblem { flex-basis: 104px; font-size: 3rem; }
    .feature-layout { grid-template-columns: 200px minmax(0, 1fr); gap: var(--feature-space-lg); }
}
@media (max-width: 640px) {
    .feature-shell { width: calc(100% - 2rem); }
    .feature-topbar-inner { min-height: 72px; }
    .feature-wordmark { font-size: 1.25rem; }
    .feature-hero { padding-block: var(--feature-space-xl); }
    .feature-emblem { display: none; }
    .feature-eyebrow { gap: .75rem; font-size: .75rem; }
    .feature-intro { font-size: 1.25rem; }
    .feature-layout { display: block; padding-block: var(--feature-space-lg) var(--feature-space-xl); }
    .feature-sidebar { position: static; border-bottom: 1px solid var(--feature-rule); padding-bottom: var(--feature-space-lg); margin-bottom: var(--feature-space-lg); }
    .feature-resources { display: flex; flex-wrap: wrap; gap: 1rem 1.5rem; }
    .feature-resources a { font-size: .9375rem; }
    .feature-page .docs-section h2 { font-size: 1.375rem; }
    .feature-page .article-section { padding-bottom: var(--feature-space-lg); margin-bottom: var(--feature-space-lg); }
    .feature-footer { align-items: flex-start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
    html.feature-document { scroll-behavior: auto; }
    .feature-page a { transition: none; }
}