:root{--bg:#f5f6f8;--surface:#fff;--surface-soft:#f0f2f5;--text:#111827;--muted:#667085;--line:#d7dce3;--dark:#1f2937;--dark-2:#374151;--success:#e8f5ec;--warning:#fff5df;--danger:#fdecec;--radius:16px;--shadow:0 16px 45px rgba(17,24,39,.07);--max:1240px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg);line-height:1.5}button,select{font:inherit}a{color:inherit}.container{width:min(calc(100% - 40px),var(--max));margin:0 auto}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.nav-wrap{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;gap:11px;align-items:center;text-decoration:none}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--dark);border-radius:10px;font-size:23px}.brand strong,.brand small{display:block}.brand strong{font-size:18px}.brand small{margin-top:2px;color:var(--muted);font-size:9px;letter-spacing:.12em}.main-nav{display:flex;align-items:center;gap:24px}.main-nav a{text-decoration:none;font-size:14px;color:var(--dark-2)}.main-nav a:hover{color:#000}.hero{padding:68px 0 34px;display:grid;grid-template-columns:minmax(0,1.15fr) 330px minmax(360px,.95fr);gap:24px;align-items:stretch}.hero-copy{padding:22px 20px 22px 0;align-self:center}.eyebrow,.section-kicker{margin:0 0 8px;color:var(--muted);font-size:11px;font-weight:800;letter-spacing:.15em}h1,h2,h3,p{margin-top:0}h1{max-width:700px;margin-bottom:18px;font-size:clamp(42px,5.3vw,72px);line-height:.98;letter-spacing:-.045em}h2{margin-bottom:6px;font-size:28px;letter-spacing:-.025em}h3{margin-bottom:5px}.hero-text{max-width:650px;margin-bottom:26px;color:var(--dark-2);font-size:17px}.hero-actions,.controls-actions{display:flex;flex-wrap:wrap;gap:10px}.btn{appearance:none;border:1px solid var(--dark);border-radius:9px;padding:11px 16px;cursor:pointer;text-decoration:none;font-weight:700;transition:transform .15s ease,background .15s ease}.btn:hover{transform:translateY(-1px)}.btn-primary{background:var(--dark);color:#fff}.btn-secondary{background:#fff;color:var(--dark)}.ad-demo{align-self:center;text-align:center}.ad-slot{width:min(100%,300px);aspect-ratio:300/250;margin:0 auto;position:relative;overflow:hidden;border:1.5px dashed #8d96a3;border-radius:10px;background:linear-gradient(45deg,transparent 49.5%,#d5dae1 50%,transparent 50.5%),linear-gradient(-45deg,transparent 49.5%,#d5dae1 50%,transparent 50.5%),#f8f9fb}.ad-slot.is-filled{border-style:solid;background:radial-gradient(circle at top right,rgba(255,255,255,.12),transparent 45%),var(--dark);color:#fff}.ad-slot-inner{position:absolute;inset:0;display:grid;place-content:center;gap:7px;padding:20px}.ad-size{font-size:14px;color:var(--muted)}.ad-slot.is-filled .ad-size,.ad-slot.is-filled small{color:#d9dee7}.ad-slot strong{font-size:25px}.fine-print{margin:8px 0 0;color:var(--muted);font-size:11px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.auction-panel{padding:18px}.panel-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:18px;margin-bottom:14px}.panel-heading h2{font-size:22px}.auction-id-wrap{display:flex;gap:7px;align-items:center;color:var(--muted);font-size:12px;white-space:nowrap}.status-dot{width:8px;height:8px;border-radius:50%;background:#adb5c0}.status-dot.is-live{background:#111827;box-shadow:0 0 0 5px rgba(17,24,39,.08)}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:13px}th,td{padding:10px 8px;border-bottom:1px solid #eceef2;text-align:left;white-space:nowrap}th{color:var(--muted);font-size:10px;letter-spacing:.05em;text-transform:uppercase}.empty-state{padding:32px 8px;text-align:center;color:var(--muted)}.badge{display:inline-block;min-width:66px;padding:4px 7px;border-radius:999px;text-align:center;font-size:11px;font-weight:800}.badge-won{background:var(--success)}.badge-timeout{background:var(--warning)}.badge-below-floor,.badge-no-bid{background:var(--danger)}.badge-lost{background:var(--surface-soft)}.auction-summary{margin-top:13px;padding-top:13px;display:flex;flex-wrap:wrap;gap:16px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}.auction-summary strong{color:var(--text)}.section{padding:58px 0}.section-muted{background:#eceff3;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.section-heading{max-width:760px;margin-bottom:24px}.section-heading p{color:var(--muted)}.flow-grid{display:grid;grid-template-columns:minmax(130px,1fr) auto minmax(130px,1fr) auto minmax(130px,1fr) auto minmax(130px,1fr) auto minmax(130px,1fr) auto minmax(130px,1fr);gap:10px;align-items:stretch}.flow-step{min-width:0;padding:18px 15px;border:1px solid var(--line);border-radius:13px;background:var(--surface)}.step-number{display:block;color:#929ba8;font-size:10px;font-weight:800}.step-icon{margin:22px 0 10px;font-size:27px;font-weight:700}.flow-step h3{font-size:16px}.flow-step p{margin-bottom:0;color:var(--muted);font-size:12px}.flow-arrow{align-self:center;color:#7e8793;font-size:24px}.lab-layout{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(330px,.7fr);gap:26px;align-items:start}.labs-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lab-card{min-height:112px;display:flex;gap:15px;padding:18px;border:1px solid var(--line);border-radius:13px;background:var(--surface)}.lab-icon{flex:0 0 40px;height:40px;display:grid;place-items:center;border:1px solid #aeb6c1;border-radius:10px;font-size:14px;font-weight:800}.lab-card h3{font-size:16px}.lab-card p{margin:0;color:var(--muted);font-size:13px}.controls-panel{padding:22px}.controls-panel form{display:grid;gap:15px}.controls-panel label{display:grid;grid-template-columns:1fr;gap:5px}.controls-panel label>span{font-size:13px;font-weight:800}.controls-panel label>small{color:var(--muted);font-size:11px}select{width:100%;margin-top:2px;padding:10px 12px;border:1px solid #cfd5dd;border-radius:8px;background:#fff;color:var(--text)}.learning-note{margin-top:18px;padding:14px;border-radius:10px;background:var(--surface-soft);font-size:12px}.learning-note p{margin:4px 0 0;color:var(--muted)}.about-section{display:grid;grid-template-columns:.8fr 1.2fr;gap:48px;align-items:start}.about-section p{color:var(--dark-2);font-size:17px}.site-footer{padding:26px 0;background:#111827;color:#f7f7f8}.footer-wrap{display:flex;justify-content:space-between;gap:20px;align-items:center}.footer-wrap div{display:grid;gap:2px}.footer-wrap span{color:#aeb6c2;font-size:12px}.footer-wrap a{color:#f7f7f8;font-size:13px}@media(max-width:1080px){.hero{grid-template-columns:1fr 320px}.hero-copy{grid-column:1/-1}.flow-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.flow-arrow{display:none}}@media(max-width:820px){.main-nav{display:none}.hero,.lab-layout,.about-section{grid-template-columns:1fr}.flow-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.ad-demo{padding:10px 0}}@media(max-width:560px){.container{width:min(calc(100% - 24px),var(--max))}.hero{padding-top:42px}h1{font-size:43px}.flow-grid,.labs-grid{grid-template-columns:1fr}.footer-wrap{align-items:flex-start;flex-direction:column}}

/* Version 0.2 — auction timeline */
.version-pill{margin-left:2px;padding:4px 7px;border:1px solid var(--line);border-radius:999px;background:var(--surface-soft);color:var(--dark-2);font-size:10px;font-weight:800;letter-spacing:.06em}
.btn:disabled{cursor:not-allowed;opacity:.48;transform:none}
.timeline-panel{grid-column:1/-1;margin-top:12px;padding:24px}
.timeline-heading{align-items:center}
.timeline-heading p{max-width:720px;margin:4px 0 0;color:var(--muted);font-size:14px}
.replay-button{flex:0 0 auto;padding:9px 13px;font-size:13px}
.timeline-meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.timeline-meta span{padding:7px 10px;border:1px solid var(--line);border-radius:999px;background:var(--surface-soft);color:var(--muted);font-size:11px}
.timeline-meta strong{color:var(--text)}
.timeline-layout{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(290px,.55fr);gap:22px;align-items:start}
.timeline-stage{min-height:390px;padding:8px 4px 8px 0}
.timeline-empty{min-height:360px;display:grid;place-content:center;justify-items:center;padding:36px;border:1px dashed var(--line);border-radius:12px;text-align:center;color:var(--muted)}
.timeline-empty[hidden]{display:none}
.timeline-empty-icon{display:grid;place-items:center;width:48px;height:48px;margin-bottom:12px;border:1px solid var(--line);border-radius:50%;background:var(--surface-soft);color:var(--dark);font-size:22px}
.timeline-empty strong{margin-bottom:5px;color:var(--text)}
.timeline-empty p{max-width:420px;margin:0;font-size:13px}
.timeline-events{position:relative;margin:0;padding:0 0 0 90px;list-style:none}
.timeline-events::before{content:"";position:absolute;top:17px;bottom:17px;left:65px;width:1px;background:var(--line)}
.timeline-event{position:relative;margin:0 0 11px;opacity:0;transform:translateY(8px);transition:opacity .24s ease,transform .24s ease}
.timeline-event.is-visible{opacity:1;transform:translateY(0)}
.timeline-event:last-child{margin-bottom:0}
.timeline-time{position:absolute;top:14px;right:calc(100% + 46px);width:64px;color:var(--muted);font-size:11px;font-variant-numeric:tabular-nums;text-align:right}
.timeline-marker{position:absolute;top:12px;left:-33px;z-index:1;width:14px;height:14px;border:3px solid var(--surface);border-radius:50%;background:#98a2b3;box-shadow:0 0 0 1px var(--line)}
.timeline-event[data-kind="close"] .timeline-marker{border-radius:3px;background:var(--dark);transform:rotate(45deg)}
.timeline-event[data-status="WON"] .timeline-marker{background:#2f7d4a}
.timeline-event[data-status="TIMEOUT"] .timeline-marker,.timeline-event[data-status="BELOW FLOOR"] .timeline-marker,.timeline-event[data-status="NO BID"] .timeline-marker{background:#b16b1d}
.event-button{width:100%;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:center;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--text);cursor:pointer;text-align:left;transition:border-color .15s ease,background .15s ease,transform .15s ease}
.event-button:hover{border-color:#9aa3af;transform:translateX(2px)}
.event-button[aria-pressed="true"]{border-color:var(--dark);background:#f8f9fb;box-shadow:0 0 0 2px rgba(31,41,55,.07)}
.event-copy{min-width:0}
.event-title{display:block;font-size:13px;font-weight:800}
.event-detail{display:block;margin-top:2px;overflow:hidden;color:var(--muted);font-size:12px;text-overflow:ellipsis;white-space:nowrap}
.event-status{padding:4px 7px;border-radius:999px;background:var(--surface-soft);font-size:10px;font-weight:800;white-space:nowrap}
.timeline-event[data-status="WON"] .event-status{background:var(--success)}
.timeline-event[data-status="TIMEOUT"] .event-status{background:var(--warning)}
.timeline-event[data-status="BELOW FLOOR"] .event-status,.timeline-event[data-status="NO BID"] .event-status{background:var(--danger)}
.event-explainer{position:sticky;top:98px;min-height:260px;padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--surface-soft)}
.event-explainer h3{font-size:20px;line-height:1.2}
.event-explainer>p{margin:10px 0 18px;color:var(--dark-2);font-size:13px}
.explanation-metrics{display:grid;gap:0;margin:0}
.explanation-metrics div{display:flex;justify-content:space-between;gap:20px;padding:9px 0;border-top:1px solid var(--line)}
.explanation-metrics dt{color:var(--muted);font-size:11px}
.explanation-metrics dd{margin:0;font-size:11px;font-weight:800;text-align:right}
.timeline-result{margin-top:22px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:16px;align-items:center;padding:15px 17px;border-radius:11px;background:var(--dark);color:#fff}
.timeline-result.is-empty{background:var(--surface-soft);color:var(--text)}
.timeline-result>span{font-size:10px;font-weight:800;letter-spacing:.12em}
.timeline-result>strong{font-size:16px}
.timeline-result>small{color:#d6dae1;text-align:right}
.timeline-result.is-empty>small{color:var(--muted)}
.badge-pending{background:var(--surface-soft);color:var(--muted)}
.badge-eligible{background:#e9f1fb;color:#274b74}
.auction-row.is-updated{animation:row-flash .55s ease}
@keyframes row-flash{0%{background:#eef2f7}100%{background:transparent}}
@media(max-width:1080px){.timeline-layout{grid-template-columns:minmax(0,1.2fr) minmax(270px,.8fr)}}
@media(max-width:820px){.timeline-layout{grid-template-columns:1fr}.event-explainer{position:static;min-height:0}.timeline-result{grid-template-columns:1fr;gap:4px}.timeline-result>small{text-align:left}.timeline-panel{padding:18px}}
@media(max-width:560px){.brand .version-pill{display:none}.timeline-heading{align-items:flex-start;flex-direction:column}.timeline-events{padding-left:68px}.timeline-events::before{left:51px}.timeline-time{right:calc(100% + 34px);width:52px}.timeline-marker{left:-24px}.event-button{grid-template-columns:1fr}.event-detail{white-space:normal}.event-status{justify-self:start}.timeline-stage{min-height:320px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.timeline-event,.event-button,.btn{transition:none}.auction-row.is-updated{animation:none}}

/* Version 0.3 — SSP supply paths and two auction layers */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.supply-panel{grid-column:1/-1;margin-top:12px;padding:24px}
.supply-heading{align-items:center}
.supply-heading p{max-width:710px;margin:4px 0 0;color:var(--muted);font-size:14px}
.layer-key{display:grid;gap:7px;flex:0 0 auto;color:var(--muted);font-size:11px}
.layer-key span{display:flex;align-items:center;gap:7px}
.layer-key strong{width:22px;height:22px;display:grid;place-items:center;border-radius:50%;background:var(--dark);color:#fff;font-size:10px}
.ssp-grid{position:relative;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:22px}
.supply-empty{grid-column:1/-1;min-height:250px;display:grid;place-content:center;justify-items:center;padding:34px;border:1px dashed var(--line);border-radius:12px;color:var(--muted);text-align:center}
.supply-empty strong{color:var(--text)}
.supply-empty p{margin:5px 0 0;font-size:13px}
.ssp-card{min-width:0;overflow:hidden;border:1px solid var(--line);border-radius:13px;background:#fff;opacity:0;transform:translateY(7px);transition:opacity .25s ease,transform .25s ease,border-color .2s ease,box-shadow .2s ease}
.ssp-card.is-visible{opacity:1;transform:translateY(0)}
.ssp-card[data-status="WON"]{border-color:#7bb28d;box-shadow:0 10px 28px rgba(47,125,74,.11)}
.ssp-card[data-status="TIMEOUT"],.ssp-card[data-status="NO BID"]{border-color:#d9b27e}
.ssp-card-header{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;padding:16px;border-bottom:1px solid var(--line);background:#f8f9fb}
.ssp-identity{display:flex;gap:10px;align-items:center;min-width:0}
.ssp-mark{flex:0 0 34px;height:34px;display:grid;place-items:center;border-radius:9px;background:var(--dark);color:#fff;font-size:12px;font-weight:900}
.ssp-identity strong,.ssp-identity small{display:block}
.ssp-identity strong{font-size:14px}
.ssp-identity small{margin-top:1px;color:var(--muted);font-size:10px}
.path-status{padding:4px 7px;border-radius:999px;background:var(--surface-soft);font-size:10px;font-weight:800;white-space:nowrap}
.ssp-card[data-status="WON"] .path-status{background:var(--success)}
.ssp-card[data-status="TIMEOUT"] .path-status{background:var(--warning)}
.ssp-card[data-status="NO BID"] .path-status{background:var(--danger)}
.internal-auction{padding:14px 16px}
.internal-heading{display:flex;justify-content:space-between;gap:12px;margin-bottom:9px;color:var(--muted);font-size:10px;font-weight:800;letter-spacing:.07em;text-transform:uppercase}
.dsp-bid-list{display:grid;gap:6px}
.dsp-bid-row{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:9px;align-items:center;padding:9px 10px;border-radius:8px;background:var(--surface-soft);font-size:11px}
.dsp-bid-row strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dsp-bid-price{font-variant-numeric:tabular-nums;font-weight:800}
.dsp-bid-state{min-width:54px;color:var(--muted);font-size:9px;font-weight:800;text-align:right}
.dsp-bid-row[data-status="FORWARDED"]{background:#e9f1fb}
.dsp-bid-row[data-status="BELOW FLOOR"],.dsp-bid-row[data-status="NO BID"],.dsp-bid-row[data-status="TIMEOUT"]{background:#fff4e7}
.ssp-return{display:grid;gap:3px;margin:0 16px 16px;padding:12px;border-top:1px solid var(--line);border-radius:8px;background:#f8f9fb}
.ssp-return span{color:var(--muted);font-size:9px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}
.ssp-return strong{font-size:12px}
.ssp-return small{color:var(--muted);font-size:10px}
.inspect-path{justify-self:start;margin-top:7px;padding:0;border:0;background:transparent;color:var(--dark);cursor:pointer;font-size:10px;font-weight:800}
.inspect-path:hover{text-decoration:underline}
.inspect-path:disabled{cursor:not-allowed;opacity:.45;text-decoration:none}
.duplication-note{display:flex;gap:12px;align-items:flex-start;margin-top:16px;padding:14px 16px;border-radius:10px;background:var(--surface-soft)}
.duplication-note p{margin:0;color:var(--muted);font-size:12px}
.duplication-note p strong{color:var(--text)}
.duplication-icon{flex:0 0 32px;height:32px;display:grid;place-items:center;border:1px solid var(--line);border-radius:8px;background:#fff;font-weight:800}
.path-name strong,.path-name small{display:block}
.path-name small{margin-top:1px;color:var(--muted);font-size:10px}
.lab-card.is-current{border-color:#9ba6b4;box-shadow:0 8px 24px rgba(17,24,39,.06)}
.current-label{display:block;margin-bottom:3px;color:#2f6e47;font-size:9px;font-weight:900;letter-spacing:.09em}
.timeline-event[data-status="LOST"] .event-status{background:var(--surface-soft)}
.timeline-event[data-status="NO VALID BID"] .event-status{background:var(--danger)}
@media(max-width:1080px){.ssp-grid{grid-template-columns:repeat(3,minmax(220px,1fr));overflow-x:auto;padding-bottom:5px}}
@media(max-width:820px){.supply-heading{align-items:flex-start;flex-direction:column}.layer-key{grid-template-columns:1fr 1fr}.ssp-grid{grid-template-columns:1fr;overflow:visible}.supply-panel{padding:18px}}
@media(max-width:560px){.layer-key{grid-template-columns:1fr}.dsp-bid-row{grid-template-columns:minmax(0,1fr) auto}.dsp-bid-state{grid-column:1/-1;text-align:left}.duplication-note{align-items:flex-start}.supply-empty{min-height:210px}}
@media(prefers-reduced-motion:reduce){.ssp-card{transition:none}}