.seo-body { background: #f4f5f7; }
.seo-shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 28px 0 52px; }
.seo-breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; color: var(--muted); font-size: 12px; }
.seo-breadcrumb a, .seo-footer a { color: var(--red-dark); text-decoration: none; }
.seo-breadcrumb a:hover, .seo-footer a:hover { text-decoration: underline; }
.seo-hero { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.seo-hero h1 { margin-bottom: 8px; font-size: clamp(26px, 4vw, 38px); }
.seo-hero h2 { margin-bottom: 8px; font-size: 20px; }
.seo-hero p { margin: 0; color: var(--muted); }
.seo-diagram { margin: 18px 0 28px; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; text-align: center; }
.seo-diagram img { display: block; width: 100%; max-height: 680px; object-fit: contain; }
.seo-diagram figcaption { margin-top: 10px; color: var(--muted); font-size: 11px; }
.seo-parts { margin-top: 26px; }
.seo-part-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; }
.seo-part-card { min-width: 0; padding: 15px; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
.seo-part-number { color: var(--red-dark); font: 800 14px ui-monospace, SFMono-Regular, Consolas, monospace; text-decoration: none; }
.seo-part-number:hover { text-decoration: underline; }
.seo-part-card h3 { margin: 7px 0; font-size: 13px; line-height: 1.4; }
.seo-part-card p { margin: 0; color: var(--muted); font-size: 11px; }
.seo-reference-list { display: grid; gap: 10px; }
.seo-reference-card { display: grid; gap: 5px; padding: 15px 17px; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--ink); text-decoration: none; }
.seo-reference-card:hover { border-color: var(--red); box-shadow: 0 5px 16px rgba(25,33,43,.08); }
.seo-reference-card span { color: var(--muted); font-size: 12px; }
.seo-footer { display: flex; flex-wrap: wrap; justify-content: center; gap: 9px; padding: 24px 16px; border-top: 1px solid var(--line); background: #fff; color: var(--muted); font-size: 12px; }
@media (max-width: 700px) { .seo-hero { align-items: flex-start; flex-direction: column; } .seo-hero .primary-button { width: 100%; } }