:root{--sd-bg: #F5F3F0;--sd-surface: #FFFFFF;--sd-surface2: #F0ECE7;--sd-border: #E4DED8;--sd-border-hi: #C9C2BB;--sd-grid: rgba(160,148,136,.07);--sd-ink: #1C1917;--sd-muted: #6B6560;--sd-dim: #A09890;--sd-req: #1B65D6;--sd-data: #0A7A56;--sd-model:#6530C0;--sd-rag: #BF5A15;--sd-rel: #BE2B2B;--sd-ops: #8C6C0A}[data-layer=requirements]{--sd-accent: var(--sd-req)}[data-layer=data]{--sd-accent: var(--sd-data)}[data-layer=model]{--sd-accent: var(--sd-model)}[data-layer=ragagent]{--sd-accent: var(--sd-rag)}[data-layer=reliability]{--sd-accent: var(--sd-rel)}[data-layer=ops]{--sd-accent: var(--sd-ops)}body:has(main.sd-page){background:var(--sd-bg);color:var(--sd-ink)}.sd-page{min-height:100vh;font-family:var(--sans);padding-top:var(--nav-h)}.sd-hero{background:linear-gradient(160deg,#ede9e3,#f5f3f0 55%,#f0ece7);border-bottom:1px solid var(--sd-border);padding:clamp(56px,10vh,96px) 0 48px}.sd-hero-inner{max-width:900px;margin:0 auto;padding:0 clamp(24px,5vw,60px)}.sd-hero-tag{font-size:11px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--sd-muted);margin-bottom:16px}.sd-hero-title{font-family:var(--display);font-size:clamp(40px,6vw,72px);font-weight:400;line-height:1.05;color:var(--sd-ink);margin-bottom:20px}.sd-hero-accent{color:var(--sd-req);font-style:italic}.sd-hero-desc{font-size:17px;color:var(--sd-muted);margin-bottom:40px;max-width:560px}.sd-framework{display:flex;flex-wrap:wrap;gap:8px}.sd-step{padding:7px 16px;border-radius:6px;font-size:12px;font-weight:600;letter-spacing:.06em;cursor:pointer;transition:all .15s;border:1px solid var(--sd-border-hi);background:var(--sd-surface);color:var(--sd-muted)}.sd-step:hover{border-color:var(--sd-muted);color:var(--sd-ink);background:var(--sd-surface)}.sd-step--active{background:var(--sd-accent, var(--sd-req));border-color:var(--sd-accent, var(--sd-req));color:#fff}.sd-step[data-step=Requirements].sd-step--active{--sd-accent: var(--sd-req)}.sd-step[data-step=Data].sd-step--active{--sd-accent: var(--sd-data)}.sd-step[data-step=Model].sd-step--active{--sd-accent: var(--sd-model)}.sd-step[data-step=Serving].sd-step--active{--sd-accent: var(--sd-rag)}.sd-step[data-step=Reliability].sd-step--active{--sd-accent: var(--sd-rel)}.sd-step[data-step=Operations].sd-step--active{--sd-accent: var(--sd-ops)}.sd-layout{display:grid;grid-template-columns:220px 1fr;grid-template-rows:auto 1fr;grid-template-areas:"mobile mobile" "rail   panel";max-width:1280px;margin:0 auto;min-height:calc(100vh - var(--nav-h) - 220px)}.sd-rail-mobile{grid-area:mobile;display:none;padding:16px 20px;border-bottom:1px solid var(--sd-border);background:var(--sd-surface)}.sd-mobile-select{width:100%;padding:10px 14px;background:var(--sd-bg);color:var(--sd-ink);border:1px solid var(--sd-border-hi);border-radius:8px;font-size:14px;font-family:var(--sans);cursor:pointer;outline:none}.sd-rail{grid-area:rail;border-right:1px solid var(--sd-border);background:var(--sd-surface);padding:24px 0;position:sticky;top:var(--nav-h);height:calc(100vh - var(--nav-h));overflow-y:auto;overflow-x:hidden;scrollbar-width:thin;scrollbar-color:var(--sd-border-hi) transparent}.sd-rail::-webkit-scrollbar{width:4px}.sd-rail::-webkit-scrollbar-thumb{background:var(--sd-border-hi);border-radius:2px}.sd-rail-divider{height:1px;background:var(--sd-border);margin:8px 16px}.sd-rail-item{display:flex;align-items:center;gap:10px;width:100%;padding:9px 16px;background:transparent;border:none;border-left:2px solid transparent;cursor:pointer;text-align:left;transition:all .15s;color:var(--sd-dim)}.sd-rail-item:hover{background:#0000000a;color:var(--sd-ink)}.sd-rail-item--active{border-left-color:var(--sd-accent, var(--sd-req));background:#0000000d;color:var(--sd-ink)}.sd-rail-dot{width:7px;height:7px;border-radius:50%;background:var(--sd-dim);flex-shrink:0;transition:background .15s}.sd-rail-item--active .sd-rail-dot,.sd-rail-item:hover .sd-rail-dot{background:var(--sd-accent, var(--sd-req))}.sd-rail-num{font-size:11px;font-weight:600;font-family:var(--mono);color:var(--sd-dim);min-width:20px}.sd-rail-item--active .sd-rail-num{color:var(--sd-accent, var(--sd-req))}.sd-rail-title{font-size:12.5px;font-weight:500;line-height:1.3}.sd-panel{grid-area:panel;padding:32px clamp(20px,4vw,48px) 64px;min-height:600px}.sd-blueprint{background:var(--sd-surface);background-image:linear-gradient(var(--sd-grid) 1px,transparent 1px),linear-gradient(90deg,var(--sd-grid) 1px,transparent 1px);background-size:28px 28px;border:1px solid var(--sd-border);border-top:2px solid var(--sd-accent, var(--sd-req));border-radius:10px;margin-bottom:32px;overflow:hidden}.sd-bp-label{display:flex;align-items:center;flex-wrap:wrap;gap:10px;padding:12px 20px;border-bottom:1px solid var(--sd-border);background:#00000006}.sd-bp-badge{font-family:var(--mono);font-size:10px;font-weight:600;letter-spacing:.12em;color:var(--sd-accent, var(--sd-req));background:#1b65d614;padding:3px 8px;border-radius:4px;border:1px solid rgba(27,101,214,.18)}[data-layer=data] .sd-bp-badge{background:#0a7a5614;border-color:#0a7a562e}[data-layer=model] .sd-bp-badge{background:#6530c014;border-color:#6530c02e}[data-layer=ragagent] .sd-bp-badge{background:#bf5a1514;border-color:#bf5a152e}[data-layer=reliability] .sd-bp-badge{background:#be2b2b14;border-color:#be2b2b2e}[data-layer=ops] .sd-bp-badge{background:#8c6c0a14;border-color:#8c6c0a2e}.sd-bp-stage{font-size:12px;font-weight:600;color:var(--sd-ink)}.sd-bp-principle{font-size:11.5px;color:var(--sd-muted);font-style:italic;margin-left:auto;max-width:400px;text-align:right}.sd-bp-art{font-family:var(--mono);font-size:12.5px;line-height:1.7;color:var(--sd-muted);padding:20px 24px;white-space:pre;overflow-x:auto}.sd-cards{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:4px}.sd-card{background:var(--sd-surface);border:1px solid var(--sd-border);border-radius:10px;padding:18px 20px;cursor:pointer;text-align:left;transition:all .18s;color:var(--sd-ink);position:relative;box-shadow:0 1px 3px #0000000f,0 1px 2px #0000000a}.sd-card:before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:var(--sd-accent, var(--sd-req));border-radius:10px 10px 0 0;opacity:0;transition:opacity .15s}.sd-card:hover{border-color:var(--sd-border-hi);background:var(--sd-surface);transform:translateY(-2px);box-shadow:0 6px 16px #00000017,0 2px 4px #0000000d}.sd-card:hover:before,.sd-card--active:before{opacity:1}.sd-card--active{border-color:var(--sd-accent, var(--sd-req));background:var(--sd-surface);box-shadow:0 0 0 2px var(--sd-accent, var(--sd-req)),0 4px 14px #00000014}.sd-card-badge{font-family:var(--mono);font-size:10px;font-weight:600;letter-spacing:.12em;color:var(--sd-accent, var(--sd-req));margin-bottom:8px}.sd-card-question{font-size:14px;font-weight:600;color:var(--sd-ink);line-height:1.45;margin-bottom:8px}.sd-card-options{font-size:12px;color:var(--sd-dim);margin-bottom:14px;font-family:var(--mono)}.sd-card-indicators{display:flex;gap:16px;flex-wrap:wrap}.sd-indicator{display:flex;align-items:center;gap:6px}.sd-ind-label{font-size:10px;color:var(--sd-dim)}.sd-ind-dots{display:flex;gap:3px}.sd-dot,.sd-tri{font-size:9px;color:var(--sd-border-hi)}.sd-dot--on,.sd-tri--on{color:var(--sd-accent, var(--sd-req))}.sd-detail{background:var(--sd-surface);border:1px solid var(--sd-border);border-radius:10px;margin-top:12px;margin-bottom:8px;overflow:hidden;animation:sdSlideIn .18s ease;box-shadow:0 4px 20px #00000012}@keyframes sdSlideIn{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}.sd-detail-header{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--sd-border);background:#00000008}.sd-detail-title{font-size:13px;font-weight:600;color:var(--sd-ink);flex:1;padding-right:12px}.sd-detail-close{font-size:14px;color:var(--sd-dim);background:none;border:none;cursor:pointer;padding:2px 6px;border-radius:4px;transition:color .15s}.sd-detail-close:hover{color:var(--sd-ink)}.sd-detail-tabs{display:flex;gap:0;border-bottom:1px solid var(--sd-border);padding:0 20px}.sd-tab{padding:10px 16px;font-size:12.5px;font-weight:600;color:var(--sd-dim);background:none;border:none;border-bottom:2px solid transparent;cursor:pointer;transition:all .15s;margin-bottom:-1px}.sd-tab:hover{color:var(--sd-muted)}.sd-tab--active{color:var(--sd-accent, var(--sd-req));border-bottom-color:var(--sd-accent, var(--sd-req))}.sd-pane{padding:20px}.sd-tradeoffs{width:100%;border-collapse:collapse;font-size:13px;margin-bottom:16px}.sd-tradeoffs th{text-align:left;font-size:10.5px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--sd-dim);padding:8px 10px;border-bottom:1px solid var(--sd-border)}.sd-tradeoffs td{padding:10px;border-bottom:1px solid var(--sd-border);color:var(--sd-muted);vertical-align:top;line-height:1.5}.sd-tradeoffs tr:last-child td{border-bottom:none}.sd-tradeoffs tr:hover td{background:#00000006}.sd-td-approach{font-family:var(--mono);font-size:12px;font-weight:600;color:var(--sd-ink);white-space:nowrap}.sd-td-pro{color:var(--sd-data)}.sd-td-con{color:var(--sd-rel)}.sd-rec{background:#1b65d60d;border:1px solid rgba(27,101,214,.14);border-radius:8px;padding:12px 16px;font-size:13px;color:var(--sd-ink);line-height:1.6}[data-layer=data] .sd-rec{background:#0a7a560d;border-color:#0a7a5624}[data-layer=model] .sd-rec{background:#6530c00d;border-color:#6530c024}[data-layer=ragagent] .sd-rec{background:#bf5a150d;border-color:#bf5a1524}[data-layer=reliability] .sd-rec{background:#be2b2b0d;border-color:#be2b2b24}[data-layer=ops] .sd-rec{background:#8c6c0a0d;border-color:#8c6c0a24}.sd-rec-label{display:block;font-size:10px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--sd-accent, var(--sd-req));margin-bottom:6px}.sd-code{background:#232018;border:1px solid #332E28;border-radius:10px;overflow:hidden;box-shadow:0 2px 8px #0000001a}.sd-code-header{display:flex;align-items:center;gap:10px;padding:10px 16px;border-bottom:1px solid #2E2A24;background:#0000002e}.sd-code-dots{display:flex;gap:5px}.sd-code-dots i{display:block;width:10px;height:10px;border-radius:50%;font-style:normal}.sd-code-dots i:nth-child(1){background:#ff5f57}.sd-code-dots i:nth-child(2){background:#febc2e}.sd-code-dots i:nth-child(3){background:#28c840}.sd-code-label{font-family:var(--mono);font-size:11.5px;color:#7a7268}.sd-code-pre{margin:0;padding:18px 20px;overflow-x:auto;font-family:var(--mono);font-size:12.5px;line-height:1.7;color:#c5bab0;white-space:pre}.sd-qa-list{display:flex;flex-direction:column;gap:4px}.sd-qa-item{border-radius:8px;overflow:hidden}.sd-qa-btn{display:flex;justify-content:space-between;align-items:center;width:100%;padding:12px 14px;background:var(--sd-surface);border:1px solid var(--sd-border);border-radius:8px;cursor:pointer;text-align:left;transition:background .15s;color:var(--sd-ink);gap:12px}.sd-qa-btn:hover{background:var(--sd-surface2)}.sd-qa-q{font-size:13px;font-weight:500;line-height:1.45;flex:1}.sd-qa-arrow{font-size:18px;color:var(--sd-dim);transition:transform .2s;flex-shrink:0}.sd-qa-btn--open .sd-qa-arrow{transform:rotate(90deg)}.sd-qa-answer{padding:12px 14px;font-size:13px;line-height:1.7;color:var(--sd-muted);background:var(--sd-surface);border:1px solid var(--sd-border);border-top:none;border-radius:0 0 8px 8px}@media(max-width:1023px){.sd-layout{grid-template-columns:1fr;grid-template-areas:"mobile" "panel"}.sd-rail{display:none}.sd-rail-mobile{display:block}.sd-bp-principle{display:none}}@media(max-width:639px){.sd-cards{grid-template-columns:1fr}.sd-bp-art{font-size:11px}.sd-tradeoffs{font-size:12px}.sd-tradeoffs th:nth-child(3),.sd-tradeoffs td:nth-child(3){display:none}}@media(max-width:479px){.sd-hero-title{font-size:36px}.sd-framework{gap:6px}.sd-step{padding:6px 12px;font-size:11px}}