:root{--bg:#f7f8fb;--card:#fff;--fg:#1f2937;--muted:#6b7280;--brand:#364450;--accent:#3b82f6;--border:#e6e9ec;--shadow:0 6px 18px rgba(18,24,40,.06)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;line-height:1.6}.container{max-width:1400px;margin:0 auto;padding:0}.page-head{display:flex;flex-direction:column;gap:12px;margin-bottom:14px}.kicker{font-size:13px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}.page-head h1{margin:6px 0;font-size:24px;color:var(--brand);font-weight:700}p.lead{margin:0;color:#374151}.quick-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px;font-size:14px;color:var(--muted)}.chip{padding:6px 10px;border-radius:999px;background:rgba(54,68,80,.06);color:var(--brand);font-weight:700;border:1px solid rgba(54,68,80,.08)}ul{margin:0;padding-left:20px;color:var(--muted)}li{margin-bottom:8px;font-size:14px}.toc-row{display:flex;flex-wrap:wrap;gap:10px;margin:35px 0;padding:10px;border-radius:10px;background:linear-gradient(180deg,rgba(255,255,255,.6),rgba(255,255,255,.8));border:2px solid var(--border);border-color:var(--brand);box-shadow:var(--shadow);position:sticky;top:70px;z-index:60;backdrop-filter:blur(6px)}.toc-row a{color:var(--brand);text-decoration:none;padding:6px 8px;border-radius:8px;font-weight:600}.toc-row a.small{font-weight:500;color:var(--muted);font-size:14px}.section{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:24px;margin-bottom:24px;box-shadow:var(--shadow)}.section h2{margin:11px 0;color:var(--brand);font-size:22px;font-weight:700}.section h3{margin:11px 0;color:var(--brand);font-size:20px;font-weight:700}.section 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img{width:100%;height:100%;object-fit:contain}.diagram.horizontal{flex-direction:column}.diagram.horizontal img{max-width:100%;width:100%}@media (max-width:768px){.diagram{flex-direction:column !important}.diagram img{max-width:100%;width:100%}}.modal{display:none;position:fixed;z-index:9999;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.8);align-items:center;justify-content:center;padding:20px;backdrop-filter:blur(3px)}.modal.active{display:flex;animation:fadeIn .2s ease-in-out}@keyframes fadeIn{from{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}.modal img{max-width:92%;max-height:85%;border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.4);animation:zoomIn .25s ease-in-out}@keyframes zoomIn{from{transform:scale(.95);opacity:.8}to{transform:scale(1);opacity:1}}.modal 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(max-width:560px){.use-grid{grid-template-columns:1fr}}.use-card{position:relative;aspect-ratio:1/1;border-radius:12px;overflow:hidden;border:1px solid var(--border);background:linear-gradient(180deg,#fff,#fbfdff);display:flex;align-items:flex-end;transition:.2s}.use-card:hover{transform:translateY(-6px);box-shadow:0 14px 34px rgba(18,24,40,.09)}.use-card .bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.75)}.use-card .overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.12),rgba(0,0,0,.5))}.use-card .content{position:relative;z-index:2;padding:16px;color:#fff}.use-card h3{margin:0 0 6px;font-size:18px;color:#fff;font-weight:700}.use-card p{margin:0 0 8px;font-size:14px}.btn{background:var(--brand);color:#fff;padding:8px 12px;border-radius:8px;text-decoration:none;font-weight:700;display:inline-block}.btn.alt{background:#fff;border:1px solid var(--brand);color:var(--brand)}.next-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:16px}@media (max-width:980px){.next-grid{grid-template-columns:1fr}}.next-card{border-radius:14px;padding:20px;border:1px solid var(--border);background:#fff;display:flex;flex-direction:column;gap:12px;transition:.2s}.next-card:hover{transform:translateY(-4px);box-shadow:0 10px 24px rgba(18,24,40,.08)}.next-icon{font-size:26px}.next-card h4{margin:0;color:var(--brand);font-size:18px}.next-card p{margin:0;color:var(--muted);flex-grow:1}.next-card .btn{margin-top:auto;width:max-content}.calc-wrap{margin-top:12px;display:flex;gap:20px;flex-wrap:wrap;align-items:flex-start}.controls{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.field{display:flex;align-items:center;border:1px solid var(--border);padding:8px 12px;border-radius:10px;background:#fff}.field input,.field select{border:0;background:0 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