/* ═══════════════════════════════════════════════════
   IMAGEKA — article.css
   Long-form guides, glossary, prompt library
═══════════════════════════════════════════════════ */
.art-main { background: var(--bg2); }

/* Hero */
.art-hero { border-bottom: 1px solid var(--border); background: var(--bg); }
.art-hero-inner { max-width: 1120px; margin: 0 auto; padding: 36px 24px 34px; }
.art-crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: .8rem; color: var(--tx2); margin-bottom: 22px; }
.art-crumbs a { color: var(--tx2); text-decoration: none; }
.art-crumbs a:hover { color: var(--blue); text-decoration: underline; }
.art-kicker { font-size: .74rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--blue); margin-bottom: 10px; }
.art-hero h1 { font-size: clamp(1.75rem, 3.6vw, 2.6rem); line-height: 1.12; letter-spacing: -.025em; font-weight: 800; color: var(--tx); max-width: 820px; margin-bottom: 14px; }
.art-dek { font-size: 1.06rem; line-height: 1.6; color: var(--tx2); max-width: 720px; margin-bottom: 18px; }
.art-meta { font-size: .82rem; color: var(--tx2); display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.art-meta a { color: var(--tx); font-weight: 600; text-decoration: none; }
.art-meta a:hover { text-decoration: underline; }

/* Layout */
.art-layout { max-width: 1120px; margin: 0 auto; padding: 40px 24px 64px; display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; }
.art-toc-inner { position: sticky; top: calc(var(--hh) + 24px); }
.art-toc-title { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--tx2); margin-bottom: 12px; }
.art-toc ol { list-style: none; border-left: 2px solid var(--border); }
.art-toc li a { display: block; padding: 6px 0 6px 14px; margin-left: -2px; border-left: 2px solid transparent; font-size: .84rem; line-height: 1.4; color: var(--tx2); text-decoration: none; }
.art-toc li a:hover { color: var(--tx); }
.art-toc li a.on { color: var(--blue); border-left-color: var(--blue); font-weight: 600; }
@media (max-width: 960px) {
  .art-layout { grid-template-columns: minmax(0, 1fr); gap: 0; padding-top: 28px; }
  .art-toc { display: none; }
}

/* Prose */
.prose { max-width: 720px; color: var(--tx); font-size: 1.02rem; line-height: 1.75; }
.prose > * + * { margin-top: 1.05em; }
.prose h2 { font-size: 1.5rem; line-height: 1.25; letter-spacing: -.02em; font-weight: 800; margin-top: 2.2em; scroll-margin-top: calc(var(--hh) + 20px); }
.prose h3 { font-size: 1.14rem; line-height: 1.35; font-weight: 700; margin-top: 1.7em; scroll-margin-top: calc(var(--hh) + 20px); }
.prose h2 + *, .prose h3 + * { margin-top: .6em; }
.prose p, .prose li { color: var(--tx); }
.prose a { color: var(--blue); text-decoration: underline; text-underline-offset: 2px; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: .45em; }
.prose strong { font-weight: 700; }
.prose code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .88em; background: var(--bg); border: 1px solid var(--border); border-radius: 5px; padding: 1px 6px; }
.prose .lead { font-size: 1.12rem; color: var(--tx2); }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2.4em 0; }

/* Callouts */
.callout { border: 1px solid var(--border); border-left: 4px solid var(--blue); background: var(--blue-pale); border-radius: var(--r-sm); padding: 14px 18px; font-size: .95rem; }
.callout.warn { border-left-color: #d97706; background: rgba(217,119,6,.07); }
.callout.good { border-left-color: var(--green); background: var(--green-bg); }
.callout > strong:first-child { display: block; margin-bottom: 4px; }
.callout p + p { margin-top: .5em; }

/* Prompt boxes */
.prompt-box { border: 1px solid var(--border-3); border-radius: var(--r); background: var(--bg); overflow: hidden; }
.prompt-box .pb-label { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 8px 14px; font-size: .72rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--tx2); border-bottom: 1px solid var(--border); background: var(--bg2); }
.prompt-box .pb-text { padding: 12px 14px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .86rem; line-height: 1.6; color: var(--tx); white-space: pre-wrap; word-break: break-word; }
.prompt-box .pb-note { padding: 0 14px 12px; font-size: .86rem; color: var(--tx2); }
.pb-actions { display: flex; gap: 6px; }
.pb-btn { font: inherit; font-size: .72rem; font-weight: 700; letter-spacing: .02em; text-transform: none; border: 1px solid var(--border-3); background: var(--bg2); color: var(--tx); border-radius: 100px; padding: 4px 11px; cursor: pointer; text-decoration: none; }
.pb-btn:hover { border-color: var(--blue); color: var(--blue); }
.pb-btn.primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.pb-btn.primary:hover { background: var(--blue-d); color: #fff; }

/* Before / after */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.compare > div { border: 1px solid var(--border); border-radius: var(--r); padding: 14px 16px; font-size: .92rem; background: var(--bg2); }
.compare .bad  { border-top: 3px solid var(--red); }
.compare .good { border-top: 3px solid var(--green); }
.compare .lbl { display: block; font-size: .7rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 6px; }
.compare .bad .lbl { color: var(--red); }
.compare .good .lbl { color: var(--green); }
.compare q { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .85rem; quotes: none; display: block; margin-bottom: 8px; }
@media (max-width: 620px) { .compare { grid-template-columns: 1fr; } }

/* Figures / diagrams */
.prose figure { margin-top: 1.6em; margin-bottom: 1.6em; }
.prose figure svg { width: 100%; height: auto; display: block; border: 1px solid var(--border); border-radius: var(--r); background: var(--bg); }
.prose figcaption { font-size: .84rem; color: var(--tx2); margin-top: 8px; line-height: 1.5; }
.prose svg text { font-family: var(--font); }
.dg-ink   { fill: var(--tx); }
.dg-muted { fill: var(--tx2); }
.dg-line  { stroke: var(--tx2); }
.dg-acc   { fill: var(--blue); }
.dg-accs  { stroke: var(--blue); }
.dg-panel { fill: var(--bg2); stroke: var(--border-3); }

/* Tables */
.tbl-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--r); }
.prose table { width: 100%; border-collapse: collapse; font-size: .9rem; line-height: 1.5; }
.prose th, .prose td { padding: 10px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); }
.prose th { background: var(--bg); font-weight: 700; font-size: .8rem; letter-spacing: .02em; }
.prose tr:last-child td { border-bottom: 0; }

/* FAQ */
.faq details { border: 1px solid var(--border); border-radius: var(--r-sm); padding: 0 16px; background: var(--bg2); }
.faq details + details { margin-top: 8px; }
.faq summary { cursor: pointer; padding: 13px 0; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--tx2); font-weight: 400; font-size: 1.2rem; line-height: 1; }
.faq details[open] summary::after { content: '–'; }
.faq details > *:not(summary) { padding-bottom: 14px; }

/* Key takeaways */
.takeaways { border: 1px solid var(--border); border-radius: var(--r); padding: 18px 20px; background: var(--bg); }
.takeaways > strong { display: block; font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; color: var(--tx2); margin-bottom: 8px; }

/* Glossary */
.gl-index { display: flex; flex-wrap: wrap; gap: 6px; }
.gl-index a { display: inline-block; min-width: 32px; text-align: center; padding: 4px 8px; border: 1px solid var(--border-3); border-radius: 6px; font-size: .82rem; font-weight: 700; color: var(--tx); text-decoration: none; }
.gl-index a:hover { border-color: var(--blue); color: var(--blue); }
.glossary dt { font-weight: 800; font-size: 1.04rem; margin-top: 1.4em; scroll-margin-top: calc(var(--hh) + 20px); }
.glossary dd { margin: .3em 0 0; color: var(--tx); }
.glossary dd .see { font-size: .88rem; color: var(--tx2); }

/* Prompt library */
.lib-filter { display: flex; flex-wrap: wrap; gap: 6px; position: sticky; top: var(--hh); z-index: 5; background: var(--bg2); padding: 10px 0; }
.lib-filter button { font: inherit; font-size: .8rem; font-weight: 600; padding: 6px 13px; border-radius: 100px; border: 1px solid var(--border-3); background: var(--bg2); color: var(--tx); cursor: pointer; }
.lib-filter button.on { background: var(--tx); color: var(--bg2); border-color: var(--tx); }
.lib-search { width: 100%; font: inherit; font-size: .95rem; padding: 10px 14px; border-radius: var(--r-sm); border: 1px solid var(--border-3); background: var(--bg2); color: var(--tx); }
.lib-list { display: grid; gap: 12px; }
.lib-empty { display: none; color: var(--tx2); }

/* CTA + related */
.art-cta { margin-top: 3em !important; display: flex; align-items: center; justify-content: space-between; gap: 20px; border: 1px solid var(--blue-mid); background: var(--blue-pale); border-radius: var(--r-lg); padding: 20px 22px; }
.art-cta p { font-size: .9rem; color: var(--tx2); margin-top: 4px; }
.art-cta-btn { flex-shrink: 0; background: var(--blue); color: #fff !important; text-decoration: none !important; font-weight: 700; font-size: .9rem; padding: 11px 20px; border-radius: 100px; }
.art-cta-btn:hover { background: var(--blue-d); }
@media (max-width: 620px) { .art-cta { flex-direction: column; align-items: flex-start; } }

.art-related { border-top: 1px solid var(--border); background: var(--bg); }
.art-related-inner { max-width: 1120px; margin: 0 auto; padding: 44px 24px 56px; }
.art-related h2 { font-size: 1.3rem; font-weight: 800; letter-spacing: -.02em; margin-bottom: 18px; color: var(--tx); }
.art-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.art-card { display: flex; flex-direction: column; gap: 8px; padding: 20px; border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--bg2); text-decoration: none; color: var(--tx); transition: border-color var(--tr), box-shadow var(--tr), transform var(--tr); }
.art-card:hover { border-color: var(--blue-mid); box-shadow: var(--shadow); transform: translateY(-2px); }
.art-card-cat { font-size: .7rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--blue); }
.art-card-title { font-size: 1.02rem; font-weight: 800; line-height: 1.3; letter-spacing: -.01em; }
.art-card-desc { font-size: .87rem; line-height: 1.55; color: var(--tx2); flex: 1; }
.art-card-meta { font-size: .76rem; color: var(--tx2); }
.art-all { margin-top: 20px; }
.art-all a { color: var(--blue); font-weight: 700; text-decoration: none; }

/* Simple pages (legal, about, contact) */
.page-hero { border-bottom: 1px solid var(--border); background: var(--bg); }
.page-hero-inner { max-width: 820px; margin: 0 auto; padding: 40px 24px 32px; }
.page-hero h1 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 800; letter-spacing: -.025em; color: var(--tx); margin-bottom: 8px; }
.page-hero p { color: var(--tx2); }
.page-wrap { max-width: 820px; margin: 0 auto; padding: 36px 24px 72px; }
.page-wrap .prose { max-width: none; }