/* Philosophy, Constants, Lab, Privacy. Prefix oa-. Type via .t-* classes and --t-* tokens only. */
.oa-hero { padding: calc(var(--otl-nav-h, 72px) + 5rem) 0 4rem; background: var(--otl-paper); }
.oa-hero--compact { padding-bottom: 2rem; }
.oa-hero__inner { display: grid; gap: 1.75rem; }
.oa-hero__title { font-size: clamp(2.25rem, 4.6vw, 4rem); max-width: 22ch; text-wrap: balance; }
.oa-hero--compact .oa-hero__title { font-size: clamp(2rem, 4vw, 3.25rem); }
.oa-hero__lede { color: var(--otl-text); max-width: 40rem; }
.oa-hero__sub { color: var(--otl-muted); max-width: 40rem; }

.oa-section { padding-top: 5rem; padding-bottom: 5rem; }
.oa-section--rule { border-top: 1px solid var(--border-1); }
.oa-split { display: grid; gap: 2rem; grid-template-columns: 1fr; }
@media (min-width: 64em) { .oa-split { grid-template-columns: 1fr 3fr; gap: 3rem; } }
.oa-split__main { display: grid; gap: 1.5rem; max-width: 52rem; }
.oa-big { font: var(--t-h2); letter-spacing: -0.02em; max-width: 34ch; }
.oa-prose { color: var(--otl-text); max-width: 40rem; }
.oa-red { color: var(--color-accent); }
.oa-chips { display: flex; flex-wrap: wrap; gap: .5rem; padding-top: .5rem; }
.oa-chips > * { padding: .55rem .9rem; border: 1px solid var(--otl-ink); border-radius: 999px; text-decoration: none; color: var(--otl-ink); transition: background .25s, color .25s; }
.oa-chips > span { border-color: transparent; padding-left: 0; color: var(--otl-muted); }
.oa-chips a:hover { background: var(--otl-ink); color: var(--otl-paper); }

.oa-stack { list-style: none; display: grid; gap: 0; }
.oa-stack li { display: grid; gap: .5rem; padding: 1.75rem 0; border-bottom: 1px solid var(--border-1); }
.oa-stack li:first-child { border-top: 1px solid var(--border-1); }
.oa-stack__text { color: var(--otl-text); max-width: 34rem; }
@media (min-width: 48em) { .oa-stack li { grid-template-columns: 1fr 1fr; align-items: end; } }

/* Dark band with numbered rows */
.oa-dark { background: var(--otl-ink); color: var(--otl-paper); }
.oa-dark__head { display: grid; gap: 1.25rem; margin-bottom: 3rem; max-width: 48rem; }
.oa-dark__title { font-weight: 500; }
.oa-rows { list-style: none; border-top: 1px solid var(--border-inverse); }
.oa-row { display: grid; gap: 1rem; padding: 2.25rem 0; border-bottom: 1px solid var(--border-inverse); grid-template-columns: 1fr; }
.oa-row__num { color: var(--color-text-inverse-secondary); }
.oa-row__body { display: grid; gap: .9rem; max-width: 40rem; }
.oa-row__body > p:last-child { color: var(--border-1-hover); }
.oa-row__line { color: var(--otl-paper); }
@media (min-width: 64em) { .oa-row { grid-template-columns: 4rem 1fr 1.6fr; gap: 2rem; align-items: start; } }

.oa-quote { display: grid; gap: 1.5rem; }
.oa-quote__kicker { color: var(--otl-muted); }
.oa-quote__text { max-width: 22ch; }

/* Constants sections */
.oa-const { position: relative; overflow: hidden; min-height: 80svh; display: flex; align-items: center; padding: 6rem 0; scroll-margin-top: 0; }
.oa-const--light { background: var(--otl-paper); border-top: 1px solid var(--border-1); }
.oa-const--dark { background: var(--otl-ink); color: var(--otl-paper); }
.oa-const--card { background: var(--otl-card); }
.oa-const__inner { position: relative; width: 100%; }
.oa-const__num { position: absolute; right: 0; top: 50%; transform: translateY(-50%); font: var(--t-display); font-size: clamp(9rem, 32vw, 28rem); letter-spacing: -0.05em; opacity: .07; pointer-events: none; user-select: none; }
.oa-const__body { position: relative; display: grid; gap: 1.5rem; max-width: 44rem; }
.oa-const__body .t-h1 { font-size: clamp(3rem, 9vw, 7rem); letter-spacing: -0.03em; }
.oa-const__kicker { color: var(--otl-muted); }
.oa-const--dark .oa-const__kicker { color: var(--color-text-inverse-secondary); }
.oa-const__line { max-width: 28ch; }
.oa-const__body > p:last-child { color: var(--otl-text); }
.oa-const--dark .oa-const__body > p:last-child { color: var(--border-1-hover); }

/* Lab banner */
.oa-banner { position: relative; overflow: hidden; min-height: 70svh; display: flex; align-items: flex-end; background: var(--otl-ink); }
.oa-banner__img { position: absolute; inset: -8% 0; }
.oa-banner__img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.oa-banner::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.65), rgba(0,0,0,.1) 60%); }
.oa-banner__overlay { position: relative; z-index: 1; padding-top: 4rem; padding-bottom: 3.5rem; }
.oa-banner__text { color: var(--color-on-accent); max-width: 18ch; font-size: clamp(2.25rem, 6vw, 5rem); letter-spacing: -0.02em; }

/* CTA */
.oa-cta { background: var(--otl-paper); border-top: 1px solid var(--border-1); padding: 6rem 0; }
.oa-cta__inner { display: grid; gap: 2rem; justify-items: start; }
.oa-cta__title { max-width: 20ch; }
.oa-btn { display: inline-flex; align-items: center; gap: 1rem; padding: .9rem 1.25rem .9rem 1.5rem; border-radius: 999px; background: var(--otl-ink); color: var(--otl-paper); text-decoration: none; font: var(--t-button); text-transform: uppercase; transition: background .25s, transform .25s; }
.oa-btn:hover { background: var(--color-accent); }
.oa-btn__icon { display: inline-flex; width: 1.1rem; height: 1.1rem; }
.oa-btn__icon svg { width: 100%; height: 100%; fill: currentColor; }

/* Privacy article */
.oa-legal { padding-bottom: 6rem; }
.oa-legal__body { max-width: 46rem; font: var(--t-body-lg); line-height: 1.7; color: var(--otl-ink); }
.oa-legal__body > * + * { margin-top: 1.25rem; }
.oa-legal__body h2 { font: var(--t-h3); margin-top: 2.75rem; padding-top: 1.5rem; border-top: 1px solid var(--border-1); }
.oa-legal__body ul { list-style: disc; padding-left: 1.4rem; display: grid; gap: .5rem; }
.oa-legal__body a { text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 47.99em) {
    .oa-section { padding-top: 3.5rem; padding-bottom: 3.5rem; }
    .oa-const { min-height: 0; padding: 4rem 0; }
    .oa-hero { padding-top: calc(var(--otl-nav-h, 72px) + 3rem); }
}
@media (prefers-reduced-motion: reduce) { .oa-btn, .oa-chips > * { transition: none; } }
@media (min-width: 64em) { .oa-split--solo { grid-template-columns: 1fr; } }