/* seo.css: the guide, feature, use-case and FAQ pages in the Ledger look of the home page.
   Loaded after home.css and uses its tokens (--paper, --ink, --green, --red, --line ...), so light and dark follow the same switch. */

/* ---------- page head */
.page-hero { padding-block: clamp(40px, 6vw, 80px) clamp(28px, 4vw, 48px); position: relative; overflow: hidden; }
.page-hero::before { content: ""; position: absolute; inset: -30% -10% auto 45%; height: 140%; background: radial-gradient(closest-side, color-mix(in srgb, var(--green) 9%, transparent), transparent); pointer-events: none; }
.page-hero .wrap { position: relative; display: grid; gap: 18px; }
.page-hero h1 { font-size: clamp(38px, 5.2vw, 64px); letter-spacing: -.04em; line-height: 1; max-width: 16em; }
.page-hero .lede { font-size: clamp(18px, 1.6vw, 21px); color: var(--ink-2); max-width: 36em; }
.page-hero .row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.page-hero.with-app .wrap { grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr); gap: clamp(32px, 5vw, 64px); align-items: center; }
.page-hero.with-app .wrap > div:first-child { display: grid; gap: 18px; align-content: start; }
@media (max-width: 960px) { .page-hero.with-app .wrap { grid-template-columns: minmax(0, 1fr); } }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font: 500 12px/1.4 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.crumbs a { color: var(--green-ink); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; text-underline-offset: 3px; }
.byline { display: flex; flex-wrap: wrap; gap: 6px 18px; font: 500 13px var(--mono); color: var(--ink-3); }

/* ---------- article: reading column + side notes */
.article { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: clamp(32px, 6vw, 88px); align-items: start; padding-block: 8px clamp(72px, 9vw, 120px); }
@media (max-width: 960px) { .article { grid-template-columns: minmax(0, 1fr); } }
.article-body { max-width: 68ch; min-width: 0; font-size: 18px; line-height: 1.7; color: var(--ink-2); }
.article-body > * + * { margin-top: 1.1em; }
.article-body h2 { font-size: clamp(26px, 3vw, 34px); color: var(--ink); margin-top: 2.1em; scroll-margin-top: 84px; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { font-size: 22px; color: var(--ink); margin-top: 1.6em; }
.article-body strong, .article-body b { color: var(--ink); font-weight: 650; }
.article-body a { color: var(--green-ink); text-underline-offset: 3px; text-decoration-thickness: 1px; }
.article-body ul, .article-body ol { padding-left: 1.2em; }
.article-body li + li { margin-top: .45em; }
.article-body li::marker { color: var(--green); }
.article-body code { font: 500 .86em var(--mono); background: var(--bg-2); border: 1px solid var(--line); padding: 1px 6px; border-radius: 6px; }
.article-body .panel, .article-body .chk-stage { margin-block: 1.8em; }

/* the sum, written out like a ledger line */
.formula { font: 500 15.5px/2 var(--mono); color: var(--ink); background: var(--paper) repeating-linear-gradient(to bottom, transparent 0 31px, var(--rule) 31px 32px); border: 1px solid var(--line); border-left: 3px solid var(--margin); border-radius: var(--r); padding: 4px 20px; overflow-x: auto; }

/* margin note: the red-pencil remark an experienced buyer would write */
.callout { position: relative; background: var(--paper); border: 1px solid var(--line); border-left: 3px solid var(--red); border-radius: var(--r); padding: 18px 20px 18px 22px; color: var(--ink); font-size: 16.5px; line-height: 1.6; }
.callout::before { content: "Note"; display: block; font: 600 20px/1 var(--hand); color: var(--red); margin-bottom: 6px; }
.callout.warn::before { content: "Watch out"; }
.callout a { color: var(--green-ink); }

/* tables */
.tbl { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); }
.tbl table { width: 100%; border-collapse: collapse; font-size: 15.5px; line-height: 1.45; min-width: 520px; }
.tbl th { text-align: left; font: 500 11.5px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); padding: 12px 14px; border-bottom: 1px solid var(--line-2); background: var(--bg-2); }
.tbl td { padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--ink-2); }
.tbl tr:last-child td { border-bottom: 0; }
.tbl td b { color: var(--ink); }
.tbl td.num, .tbl th.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; color: var(--ink); white-space: nowrap; }
.yes { color: var(--green-ink); font-weight: 600; }
.yes::before { content: "✓ "; }
.no { color: var(--red); font-weight: 600; }
.no::before { content: "✕ "; }
.part { color: var(--amber); font-weight: 600; }

/* side column */
.aside { position: sticky; top: calc(84px + env(safe-area-inset-top, 0px)); display: grid; gap: 16px; }
@media (max-width: 960px) { .aside { position: static; } }
.aside .card { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 22px; display: grid; gap: 10px; box-shadow: var(--shadow); }
.aside .card h3 { font-size: 20px; }
.aside .card p { color: var(--ink-2); font-size: 15px; }
.aside .card .btn { justify-self: start; margin-top: 4px; }
.toc { box-shadow: none !important; background: transparent !important; gap: 4px !important; padding: 18px 20px !important; }
.toc b { font: 500 11.5px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 6px; }
.toc a { color: var(--ink-2); text-decoration: none; font-size: 15px; padding: 3px 0 3px 12px; border-left: 2px solid var(--line); }
.toc a:hover { color: var(--ink); border-left-color: var(--green); }

/* ---------- card grids (hubs) */
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 760px) { .cards { grid-template-columns: minmax(0, 1fr); } }
.cards .card { display: grid; gap: 10px; align-content: start; background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 26px; text-decoration: none; color: var(--ink); transition: transform .15s, box-shadow .15s, border-color .15s; }
a.card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--line-2); }
.cards .card .meta { font: 500 11.5px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--green-ink); }
.cards .card h2 { font-size: 24px; letter-spacing: -.02em; line-height: 1.15; }
.cards .card p { color: var(--ink-2); font-size: 16px; }
.cards .card .go { font-weight: 600; color: var(--green-ink); font-size: 15px; margin-top: 4px; }
.cards .ph-card { border-style: dashed; color: var(--ink-3); }
.cards .ph-card h2 { color: var(--ink-2); }

/* ---------- FAQ groups */
.faq { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: clamp(28px, 6vw, 88px); }
.faq > h2 { font-size: clamp(28px, 3.4vw, 40px); }
.faq-list { border-top: 1px solid var(--line); }
.faq details p { max-width: 44em; }
.faq details a { color: var(--green-ink); }
@media (max-width: 860px) { .faq { grid-template-columns: minmax(0, 1fr); } }
.sec.tint { background: var(--paper); border-block: 1px solid var(--line); }
.sec.tight { padding-block: clamp(48px, 6vw, 72px); }

/* ---------- how-it-works steps, numbered like ledger lines */
.howto { list-style: none; padding: 0; margin: 0; counter-reset: st; display: grid; gap: 0; border-top: 1px solid var(--line); }
.howto li { counter-increment: st; display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 4px 18px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.howto li::before { content: counter(st, decimal-leading-zero); grid-row: span 2; font: 500 13px/1 var(--mono); color: var(--green-ink); background: var(--green-soft); border-radius: 6px; padding: 8px 0; text-align: center; height: max-content; }
.howto li h2 { font-size: 24px; margin: 0; }
.howto li p { color: var(--ink-2); }
.article-body .howto li + li { margin-top: 0; }

/* ---------- glossary terms */
.article-body h2.term { font-size: 24px; margin-top: 1.8em; padding-top: 1.2em; border-top: 1px solid var(--line); }
.article-body h2.term:first-child { margin-top: 0; padding-top: 0; border-top: 0; }

/* ---------- feature rows on article pages: the app panels keep their home-page size */
.feature-band { padding-block: clamp(56px, 7vw, 96px); }
.feature-band + .feature-band { padding-top: 0; }
.copy h2 { font-size: clamp(28px, 3.4vw, 40px); }
.facts.wide div { grid-template-columns: 220px minmax(0, 1fr); }
@media (max-width: 520px) { .facts.wide div { grid-template-columns: minmax(0, 1fr); } }

/* header: current page */
.head nav a[aria-current="page"] { color: var(--ink); background: var(--paper); box-shadow: inset 0 -2px 0 var(--green); }