/* Learn: knowledge-base hub cards + long-form article typography. */

/* --- Hub --- */
.learn-cat h2{font-size:26px;margin:36px 0 4px;letter-spacing:-.02em}
.learn-cat .cat-note{color:var(--muted);margin:0 0 16px;font-size:15px}
.learn-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.learn-card{display:flex;flex-direction:column;gap:9px;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px 20px;text-decoration:none;color:var(--ink);box-shadow:0 14px 30px #0a2d3b0a;transition:transform .15s,box-shadow .15s,border-color .15s}
a.learn-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 18px 40px #0a2d3b16}
.learn-card h3{font-size:17px;margin:0;letter-spacing:-.01em}
.learn-card p{color:var(--muted);font-size:14px;margin:0;line-height:1.5;flex:1}
.learn-card .lc-meta{font-size:12px;font-weight:800;letter-spacing:.02em;color:var(--accent)}
.learn-card.soon{opacity:.7}
.learn-card .soon-tag{align-self:flex-start;font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:var(--sage);border:1px solid var(--line);border-radius:999px;padding:3px 10px}

@media(max-width:1000px){.learn-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:660px){.learn-grid{grid-template-columns:1fr}}

/* --- Article --- */
.article{max-width:1180px;margin:auto;padding:6px 24px 48px}
.article-head{max-width:768px}
.breadcrumb{font-size:13px;font-weight:700;color:var(--muted);margin-bottom:12px}
.breadcrumb a{color:var(--accent);text-decoration:none}
.article-meta{color:var(--muted);font-size:14px;margin:10px 0 0;font-weight:600}
.article-body{max-width:768px}
.article-body h2{font-size:27px;margin:38px 0 10px;letter-spacing:-.02em;scroll-margin-top:20px}
.article-body h3{font-size:19px;margin:26px 0 6px;letter-spacing:-.01em}
.article-body p,.article-body li{font-size:17px;line-height:1.72;color:var(--ink)}
.article-body p{margin:0 0 16px}
.article-body ul,.article-body ol{margin:0 0 18px;padding-left:22px}
.article-body li{margin-bottom:9px}
.article-body strong{font-weight:800}
.article-body a{color:var(--accent);font-weight:600;text-decoration:none;border-bottom:1px solid #e9783540}
.article-body a:hover{border-bottom-color:var(--accent)}

.toc{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 20px;margin:8px 0 26px;max-width:768px}
.toc .toc-t{font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin-bottom:9px}
.toc ol{margin:0;padding-left:20px;columns:2;column-gap:30px}
.toc li{margin-bottom:7px;break-inside:avoid}
.toc a{color:var(--ink);text-decoration:none;font-size:14px}
.toc a:hover{color:var(--accent)}

.callout{border-radius:14px;padding:14px 18px;margin:0 0 18px;border:1px solid;max-width:768px}
.callout .ct{font-weight:850;margin-bottom:4px;font-size:13px;text-transform:uppercase;letter-spacing:.05em}
.callout p{margin:0;font-size:15px;line-height:1.6}
.callout.key{background:#eef4f6;border-color:#cfe0e6}
.callout.key .ct{color:#15708c}
.callout.tip{background:#eef7f1;border-color:#c6e6d3}
.callout.tip .ct{color:#1c7a4a}
.callout.warn{background:#fff6ef;border-color:#f4d3ba}
.callout.warn .ct{color:#b25a1e}

.checklist{list-style:none;padding-left:0;max-width:768px}
.checklist li{position:relative;padding-left:30px;margin-bottom:10px}
.checklist li:before{content:"✓";position:absolute;left:0;top:0;color:#1c7a4a;font-weight:800}

.related{background:var(--sage);border:1px solid var(--line);border-radius:18px;padding:20px 24px;margin:32px 0 0;max-width:768px}
.related h3{margin:0 0 10px;font-size:16px;letter-spacing:-.01em}
.related ul{margin:0;padding-left:20px}
.related li{margin-bottom:7px;font-size:15px;color:var(--ink)}
.related a{color:var(--accent);font-weight:700;text-decoration:none}

.article-nav{display:flex;justify-content:space-between;gap:16px;margin-top:34px;max-width:768px;border-top:1px solid var(--line);padding-top:18px}
.article-nav a{color:var(--accent);font-weight:700;text-decoration:none;font-size:15px}

/* Learn article hero banner (graceful: hides itself if the image is missing). */
.article-hero{margin:2px 0 24px;max-width:768px}
.article-hero img{width:100%;height:auto;display:block;border-radius:18px;border:1px solid var(--line);box-shadow:0 16px 36px #0a2d3b0f}

/* Inline concept diagrams and floor-plan gallery. */
.article-figure{margin:22px 0;max-width:768px}
.article-figure img{width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:14px;background:#fff}
.article-figure figcaption{color:var(--muted);font-size:13px;margin-top:8px;text-align:center}
.layout-gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;max-width:768px;margin:22px 0}
.layout-gallery .article-figure{margin:0;max-width:none}
@media(max-width:600px){.layout-gallery{grid-template-columns:1fr}}