:root {
  --ink:#152b39; --muted:#587180; --surface:#fff; --soft:#f5f8f7; --line:#d9e5e4;
  --teal:#007f80; --teal-dark:#005e62; --teal-soft:#dff4f0; --orange:#e2743b;
  --orange-soft:#fff0e7; --yellow:#f5bd42; --blue:#275d84; --blue-soft:#e9f2f7;
  --shadow:0 18px 45px rgba(18,54,67,.1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:radial-gradient(circle at 95% 4%,rgba(245,189,66,.16),transparent 17rem),radial-gradient(circle at 8% 16%,rgba(0,127,128,.11),transparent 22rem),var(--soft);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55}
a{color:inherit} img{max-width:100%} code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace}
.shell{width:min(1180px,calc(100% - 36px));margin:0 auto}
.skip-link{position:fixed;z-index:20;top:10px;left:10px;padding:10px 14px;border-radius:10px;color:#fff;background:var(--teal-dark);transform:translateY(-160%)}
.skip-link:focus{transform:none}
.site-header{position:relative;z-index:10;padding:22px 0}
.header-inner{display:flex;align-items:center;gap:28px}
.brand{display:inline-flex;align-items:center;gap:14px;margin-right:auto;color:var(--teal-dark);font-size:.7rem;font-weight:900;letter-spacing:.11em;text-decoration:none;text-transform:uppercase}
.brand img{width:182px}
.header-nav{display:flex;gap:22px}
.header-nav a{color:var(--muted);font-size:.76rem;font-weight:850;text-decoration:none}
.header-nav a:hover{color:var(--teal)}
.language-switcher{display:inline-flex;gap:4px;padding:4px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.82)}
.language-link{padding:5px 8px;border-radius:999px;color:var(--muted);font-size:.66rem;font-weight:900;text-decoration:none}
.language-link[aria-current=true]{color:#fff;background:var(--teal)}
.hero{padding:58px 0 86px}
.hero-layout{display:grid;grid-template-columns:minmax(0,1.03fr) minmax(380px,.97fr);gap:58px;align-items:center;min-height:580px}
.eyebrow{display:flex;align-items:center;gap:9px;margin:0 0 18px;color:var(--teal-dark);font-size:.7rem;font-weight:900;letter-spacing:.14em;text-transform:uppercase}
.eyebrow:before{width:26px;height:3px;background:var(--orange);content:""}
h1,h2,h3,p{margin-top:0}
h1{margin:0 0 24px;font-size:clamp(3.3rem,7.7vw,6.7rem);letter-spacing:-.085em;line-height:.9}
h2{margin:0;font-size:clamp(2.35rem,5vw,4.7rem);letter-spacing:-.07em;line-height:.97}
h1 em,h2 em{color:var(--teal);font-family:Georgia,"Times New Roman",serif;font-weight:500;letter-spacing:-.075em}
h3{font-size:1.28rem;letter-spacing:-.03em;line-height:1.15}
.hero-lead{max-width:700px;color:var(--muted);font-size:1.08rem}
.hero-actions,.resource-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:28px}
.button{display:inline-flex;min-height:46px;align-items:center;justify-content:center;padding:0 18px;border:1px solid var(--teal);border-radius:999px;color:#fff;background:var(--teal);font-size:.86rem;font-weight:850;text-decoration:none;transition:transform .2s,background .2s}
.button:hover,.button:focus-visible{background:var(--teal-dark);transform:translateY(-2px)}
.button.secondary{color:var(--teal-dark);background:transparent}
.hero-context{margin:26px 0 0;color:var(--muted);font-size:.72rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase}
.window-bar{display:flex;align-items:center;gap:7px;padding:13px 16px;border-bottom:1px solid rgba(217,229,228,.8)}
.window-bar>span{width:9px;height:9px;border-radius:50%;background:var(--orange)}
.window-bar>span:nth-child(2){background:var(--yellow)} .window-bar>span:nth-child(3){background:var(--teal)}
.window-bar code{margin-left:auto;color:var(--muted);font-size:.67rem}
.decision-window,.multisite-window{overflow:hidden;border:1px solid var(--line);border-radius:26px;background:rgba(255,255,255,.92);box-shadow:var(--shadow)}
.decision-window{transform:rotate(1deg)}
.window-body{padding:22px}
.request-line,.backend-line{display:flex;justify-content:space-between;gap:16px;padding:14px;border-radius:14px;background:var(--ink);color:#fff;font-size:.78rem}
.request-line span,.backend-line span{color:#c8d9df}
.decision-list{display:grid;gap:10px;margin:16px 0;padding-left:28px;border-left:1px solid var(--line)}
.decision-row{display:grid;grid-template-columns:92px 1fr;gap:12px;align-items:center;padding:14px;border:1px solid var(--line);border-radius:14px;background:#fff}
.decision-row>span{padding:6px 8px;border-radius:999px;text-align:center;font-size:.65rem;font-weight:950;letter-spacing:.08em}
.decision-row p{margin:0;color:var(--muted);font-size:.78rem}
.decision-row.allow>span{color:var(--teal-dark);background:var(--teal-soft)}
.decision-row.deny>span{color:#874025;background:var(--orange-soft)}
.decision-row.challenge>span{color:var(--blue);background:var(--blue-soft)}
.section{padding:88px 0}
.section-heading{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(300px,.7fr);gap:52px;align-items:end;margin-bottom:38px}
.section-heading>p,.section-copy{margin:0;color:var(--muted);font-size:1rem}
.card-grid,.policy-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.problem-card,.policy-card{padding:26px;border:1px solid var(--line);border-radius:22px;background:rgba(255,255,255,.84)}
.problem-card{border-top:4px solid var(--orange)}
.problem-card>span{color:var(--orange);font-family:ui-monospace,monospace;font-size:.72rem;font-weight:900}
.problem-card h3{margin:42px 0 10px}
.problem-card p,.policy-card p{margin:0;color:var(--muted);font-size:.9rem}
.solution{background:rgba(255,255,255,.52)}
.architecture{display:grid;grid-template-columns:1fr auto 1.22fr auto 1fr auto 1.1fr;gap:12px;align-items:center;margin-bottom:28px}
.architecture article{min-height:145px;padding:20px;border:1px solid var(--line);border-radius:20px;background:#fff}
.architecture article.featured{background:var(--teal-soft)} .architecture article.dark{color:#fff;background:var(--ink)}
.architecture article span{display:block;margin-bottom:28px;color:var(--orange);font-family:ui-monospace,monospace;font-size:.68rem;font-weight:950}
.architecture article strong,.architecture article small{display:block}
.architecture article small{margin-top:6px;color:var(--muted);font-size:.72rem}
.architecture article.dark small{color:#c7d8df}
.architecture>b{color:var(--orange);font-size:1.5rem}
.policy-card{position:relative;padding-top:62px}
.policy-card>span{position:absolute;top:20px;left:22px;padding:6px 9px;border-radius:999px;font-size:.62rem;font-weight:950;letter-spacing:.08em}
.policy-card.allow>span{color:var(--teal-dark);background:var(--teal-soft)}
.policy-card.deny>span{color:#874025;background:var(--orange-soft)}
.policy-card.challenge>span{color:var(--blue);background:var(--blue-soft)}
.policy-card code{display:block;margin-top:20px;padding-top:14px;border-top:1px solid var(--line);color:var(--teal-dark);font-size:.7rem}
.scope-note{max-width:920px;margin:24px 0 0;padding:14px 18px;border-left:4px solid var(--orange);color:var(--muted);background:var(--orange-soft);font-size:.8rem}
.evidence{color:#fff;background:var(--ink)}
.section-heading.light>p{color:#bed0d8}.section-heading.light h2 em{color:var(--yellow)}.section-heading.light .eyebrow{color:#dcebed}
.metric-grid{display:grid;grid-template-columns:1.25fr repeat(3,1fr);gap:14px}
.metric-card{min-height:190px;padding:24px;border:1px solid rgba(255,255,255,.14);border-radius:22px;background:rgba(255,255,255,.07)}
.metric-card.hero-metric{color:var(--ink);background:var(--yellow)}
.metric-card strong,.metric-card span,.metric-card small{display:block}
.metric-card strong{font-size:clamp(2.4rem,4vw,4.4rem);letter-spacing:-.07em;line-height:1}
.metric-card span{margin-top:28px;font-size:.72rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}
.metric-card small{margin-top:7px;color:#bed0d8}.metric-card.hero-metric small{color:#6a5728}
.agent-evidence{display:grid;grid-template-columns:.8fr 1.2fr;gap:52px;margin-top:16px;padding:28px;border:1px solid rgba(255,255,255,.14);border-radius:22px;background:rgba(255,255,255,.05)}
.agent-evidence p{color:#bed0d8}.agent-evidence h3{font-size:1.65rem}
.agent-chart{display:grid;gap:8px;align-content:center}.agent-label{display:flex;justify-content:space-between;font-size:.82rem;font-weight:900}
.bar{height:20px;margin-bottom:12px;border-radius:999px;background:rgba(255,255,255,.1);overflow:hidden}
.bar span{display:block;height:100%;border-radius:inherit;background:var(--yellow)}.bar:nth-of-type(4) span{background:var(--teal)}
.observability{background:var(--blue-soft)}
.observability-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.observability-card{padding:26px;border:1px solid #c8dbe6;border-radius:22px;background:rgba(255,255,255,.86)}
.observability-card.featured{color:#fff;background:var(--blue)}
.observability-card>span{display:inline-flex;padding:6px 9px;border-radius:999px;color:var(--blue);background:var(--blue-soft);font-family:ui-monospace,monospace;font-size:.62rem;font-weight:950;letter-spacing:.08em}
.observability-card.featured>span{color:var(--ink);background:var(--yellow)}
.observability-card h3{margin:38px 0 10px}.observability-card p{color:var(--muted);font-size:.9rem}
.observability-card.featured p{color:#dbe8ee}
.observability-card code{display:block;margin-top:22px;padding-top:14px;border-top:1px solid #c8dbe6;color:var(--blue);font-size:.7rem}
.observability-card.featured code{border-color:rgba(255,255,255,.2);color:var(--yellow)}
.multisite-layout{display:grid;grid-template-columns:1fr .88fr;gap:58px;align-items:center}
.feature-list{display:grid;gap:10px;margin:26px 0 0;padding:0;list-style:none}
.feature-list li{display:grid;grid-template-columns:24px 1fr;gap:10px;color:var(--muted)}
.feature-list li:before{display:grid;width:24px;height:24px;place-items:center;border-radius:50%;color:#fff;background:var(--teal);font-size:.75rem;font-weight:900;content:"✓"}
.multisite-window pre{margin:0;padding:28px;color:#d7e8e7;background:#102733;white-space:pre-wrap}
.multisite-window pre b{color:var(--yellow)}.multisite-window pre i{color:#8dd5cb;font-style:normal}
.reload-note{display:flex;gap:14px;align-items:center;padding:16px 20px;background:var(--teal-soft)}
.reload-note span{color:var(--teal);font-size:1.5rem}.reload-note p{margin:0;color:var(--teal-dark);font-size:.78rem;font-weight:800}
.implementation{background:rgba(255,255,255,.52)}
.implementation-grid{display:grid;gap:12px}
details{border:1px solid var(--line);border-radius:18px;background:#fff;overflow:hidden}
summary{display:grid;grid-template-columns:52px 1fr;gap:16px;align-items:center;padding:20px 22px;cursor:pointer;list-style:none}
summary::-webkit-details-marker{display:none}
summary>span{display:grid;width:44px;height:44px;place-items:center;border-radius:50%;color:#fff;background:var(--teal);font-family:ui-monospace,monospace;font-size:.72rem;font-weight:900}
summary strong,summary small{display:block}summary strong{font-size:1.08rem}summary small{margin-top:3px;color:var(--muted)}
details[open] summary{border-bottom:1px solid var(--line);background:var(--teal-soft)}
.detail-body{padding:24px}.detail-body>p{max-width:880px;color:var(--muted)}
.detail-body pre{margin:18px 0 0;padding:18px;border-radius:14px;color:#d9eae8;background:#102733;overflow:auto}
.technical-note{display:grid;grid-template-columns:1fr minmax(300px,.78fr);gap:22px;align-items:center;margin-top:20px;padding:20px;border:1px solid #c8dbe6;border-radius:16px;background:var(--blue-soft)}
.technical-note strong{display:block;margin-bottom:6px;color:var(--blue)}.technical-note p{margin:0;color:var(--muted);font-size:.84rem}
.technical-note pre{margin:0}.technical-note.route-note>code{padding:14px;border-radius:12px;color:var(--teal-dark);background:#fff;font-size:.72rem;overflow-wrap:anywhere}
.image-grid,.verification{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:18px}
figure{margin:0;border:1px solid var(--line);border-radius:16px;background:var(--soft);overflow:hidden}
figure img{display:block;width:100%;height:310px;object-fit:contain;background:#fff}
figure figcaption{padding:9px 12px;border-top:1px solid var(--line);color:var(--muted);font-size:.72rem;font-weight:800;text-align:center}
.single-image{width:min(480px,100%);margin-top:18px}.wide-image{margin-top:18px}.wide-image img{height:auto}
.verification pre{margin:0}
.methodology-layout{display:grid;grid-template-columns:.75fr 1.25fr;gap:58px}
.methodology article{padding:30px;border:1px solid var(--line);border-radius:22px;background:#fff}
.methodology article>p,.methodology li{color:var(--muted)}
.methodology li{margin-bottom:8px}.text-link{color:var(--teal-dark);font-size:.82rem;font-weight:900;text-decoration:none}
.resources{background:rgba(255,255,255,.55)}
.resource-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.resource-grid>a{display:flex;min-height:240px;flex-direction:column;padding:26px;border:1px solid var(--line);border-radius:22px;background:#fff;text-decoration:none;transition:transform .2s,box-shadow .2s}
.resource-grid>a:hover,.resource-grid>a:focus-visible{box-shadow:var(--shadow);transform:translateY(-3px)}
.resource-grid span{color:var(--orange);font-family:ui-monospace,monospace;font-size:.65rem;font-weight:950;letter-spacing:.1em}
.resource-grid strong{margin:34px 0 10px;font-size:1.35rem;letter-spacing:-.03em}.resource-grid p{max-width:520px;color:var(--muted);font-size:.88rem}
.resource-grid b{margin-top:auto;color:var(--teal-dark);font-size:.78rem}
.credits{padding:52px 0;color:#fff;background:var(--teal-dark)}
.credits-inner{display:grid;grid-template-columns:.65fr 1.1fr auto;gap:42px;align-items:center}
.credits .eyebrow{color:#c6e7e3}.credits .eyebrow:before{background:var(--yellow)}.credits h2{font-size:2.4rem}.credits p{margin:0;color:#d6ece9}.credits .text-link{color:#fff}
.site-footer{padding:28px 0;border-top:1px solid var(--line);background:#fff}
.footer-inner,.footer-brand{display:flex;align-items:center;gap:22px}.footer-inner{justify-content:space-between}.footer-brand img{width:180px}.footer-brand span{color:var(--muted);font-size:.72rem}.ioi-logo{width:132px;height:48px;object-fit:contain}
:focus-visible{outline:3px solid var(--yellow);outline-offset:3px}

@media (max-width:980px){
  .header-nav{display:none}.hero-layout,.section-heading,.multisite-layout,.agent-evidence,.methodology-layout,.credits-inner,.technical-note{grid-template-columns:1fr}
  .hero-layout{min-height:auto}.decision-window{transform:none}.architecture{grid-template-columns:1fr}.architecture>b{transform:rotate(90deg);text-align:center}
  .metric-grid{grid-template-columns:repeat(2,1fr)}.observability-grid{grid-template-columns:1fr}.credits-inner{gap:20px}
}
@media (max-width:700px){
  .shell{width:min(100% - 24px,1180px)}.site-header{padding:14px 0}.header-inner{gap:12px}.brand img{width:145px}.brand span{display:none}
  h1{font-size:clamp(3rem,17vw,4.7rem)}.hero{padding:32px 0 64px}.section{padding:66px 0}
  .card-grid,.policy-grid,.metric-grid,.resource-grid{grid-template-columns:1fr}.decision-row{grid-template-columns:1fr}.architecture article{min-height:auto}
  .image-grid,.verification{grid-template-columns:1fr}.footer-inner,.footer-brand{align-items:flex-start;flex-direction:column}
  .footer-brand span{max-width:260px}.agent-evidence{padding:22px}.metric-card{min-height:160px}
}