:root{--proof-bg:#090b0d;--proof-panel:#101316;--proof-panel-2:#15191d;--proof-line:#2e343a;--proof-line-strong:#454d55;--proof-text:#f3f0e8;--proof-muted:#aab1b7;--proof-dim:#737c85;--proof-warm:#c8ad7f;--proof-green:#9dbb9f;--proof-amber:#d5b36d;--proof-red:#cb8f83}
body{background:var(--proof-bg)}
.proof-shell{min-height:100svh;background:radial-gradient(circle at 72% 0%,rgba(113,132,150,.14),transparent 31rem),linear-gradient(180deg,#0b0e11 0%,#090b0d 44%,#0d1013 100%);color:var(--proof-text);font-family:Arial,Helvetica,sans-serif}
.depth-head{position:relative;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:22px max(24px,4vw);border-bottom:1px solid rgba(255,255,255,.11);background:rgba(9,11,13,.78);backdrop-filter:blur(16px)}
.depth-brand{font-family:Georgia,serif;font-size:1.25rem;color:var(--proof-text);text-decoration:none;letter-spacing:-.02em}.depth-head nav{display:flex;gap:8px 22px;align-items:center;flex-wrap:wrap}.depth-head nav a{color:#c9cdd1;text-decoration:none;font-size:.84rem;letter-spacing:.02em;padding:9px 0;border-bottom:1px solid transparent}.depth-head nav a:hover,.depth-head nav a[aria-current=page]{color:#fff;border-bottom-color:var(--proof-warm)}
.proof-shell main{overflow:hidden}.proof-hero,.proof-section,.proof-next{max-width:1500px;margin:0 auto;padding-left:max(24px,5vw);padding-right:max(24px,5vw)}
.proof-hero{padding-top:clamp(72px,10vw,150px);padding-bottom:clamp(76px,10vw,150px)}.proof-kicker{margin:0 0 18px;font-size:.71rem;font-weight:700;letter-spacing:.17em;color:#aeb6bd}.proof-hero h1,.proof-section h2,.proof-next h2{font-family:Georgia,serif;font-weight:400;letter-spacing:-.045em}.proof-hero h1{max-width:12.5ch;margin:0;font-size:clamp(3.15rem,8vw,8.5rem);line-height:.96}.proof-hero-lead{max-width:760px;margin:36px 0 0;font-size:clamp(1.18rem,2vw,1.55rem);line-height:1.62;color:#d9dde0}.proof-boundary{max-width:820px;margin:26px 0 0;padding-left:18px;border-left:1px solid var(--proof-warm);color:var(--proof-muted);font-size:.98rem;line-height:1.65}.proof-boundary strong{color:#e8e1d4}
.proof-rail{position:relative;display:grid;grid-template-columns:repeat(7,1fr);gap:18px;margin-top:clamp(64px,8vw,118px);padding-top:25px}.proof-rail-line{position:absolute;left:0;right:0;top:0;height:1px;background:#30363b;overflow:hidden}.proof-rail-line span{display:block;width:100%;height:100%;background:linear-gradient(90deg,var(--proof-warm),#d8dfe6);transform:scaleX(.34);transform-origin:left center;transition:transform .65s cubic-bezier(.2,.75,.2,1)}.proof-shell[data-proof-step="0"] .proof-rail-line span{transform:scaleX(.343)}.proof-shell[data-proof-step="1"] .proof-rail-line span{transform:scaleX(.486)}.proof-shell[data-proof-step="2"] .proof-rail-line span{transform:scaleX(.629)}.proof-shell[data-proof-step="3"] .proof-rail-line span{transform:scaleX(.771)}.proof-shell[data-proof-step="4"] .proof-rail-line span{transform:scaleX(.914)}.proof-rail-node{display:grid;gap:7px;color:#67717a}.proof-rail-node span{font:700 .64rem/1 Arial;letter-spacing:.12em}.proof-rail-node strong{font-size:.78rem;font-weight:600}.proof-rail-node.is-active{color:#e9ecee}
.proof-section{padding-top:clamp(90px,11vw,170px);padding-bottom:clamp(90px,11vw,170px);border-top:1px solid rgba(255,255,255,.1)}.proof-section-head{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(280px,.65fr);gap:50px 8vw;align-items:end;margin-bottom:70px}.proof-section-head .proof-kicker{grid-column:1/-1;margin-bottom:-18px}.proof-section-head h2{max-width:14ch;margin:0;font-size:clamp(2.5rem,5.8vw,5.8rem);line-height:1.02}.proof-section-head>p:not(.proof-kicker){max-width:590px;margin:0;color:var(--proof-muted);font-size:1.08rem;line-height:1.75}.proof-section-head.narrow{display:block;max-width:950px}.proof-section-head.narrow .proof-kicker{margin-bottom:18px}.proof-section-head.narrow h2{max-width:15ch}.proof-section-head.narrow>p:not(.proof-kicker){margin-top:24px;max-width:680px}
.proof-stage-layout{display:grid;grid-template-columns:minmax(320px,.82fr) minmax(360px,1fr);gap:clamp(40px,7vw,110px);align-items:start}.proof-instrument{position:sticky;top:90px;min-height:620px;border:1px solid var(--proof-line-strong);border-radius:28px;padding:22px;background:linear-gradient(145deg,#151a1f,#0b0e11 56%,#11161a);box-shadow:0 35px 90px rgba(0,0,0,.38),inset 0 1px rgba(255,255,255,.05)}.instrument-topline{display:flex;justify-content:space-between;gap:20px;padding:3px 2px 18px;border-bottom:1px solid var(--proof-line);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;color:var(--proof-muted)}.instrument-topline span:last-child{color:var(--proof-warm);text-align:right}.instrument-core{position:relative;display:grid;place-items:center;height:390px}.core-ring{position:absolute;border:1px solid #394149;border-radius:50%;transition:transform .7s ease,opacity .7s ease}.ring-a{width:270px;height:270px}.ring-b{width:210px;height:210px;border-style:dashed}.ring-c{width:145px;height:145px;border-color:#8c795d}.is-enhanced .proof-instrument .ring-a{animation:ringFloat 8s ease-in-out infinite}.is-enhanced .proof-instrument .ring-b{animation:ringFloatReverse 10s ease-in-out infinite}.core-center{position:relative;display:grid;place-items:center;width:112px;height:112px;border:1px solid #8e785a;border-radius:28px;background:radial-gradient(circle at 50% 35%,#283039,#11161b 72%);box-shadow:0 0 45px rgba(200,173,127,.08)}.core-center span{font-size:.58rem;letter-spacing:.14em;color:#999f9f}.core-center strong{margin-top:-23px;font-size:.72rem;letter-spacing:.08em;color:#f1e5d0}.instrument-fields{display:grid;grid-template-columns:1fr 1fr;gap:1px;margin:0;background:var(--proof-line);border:1px solid var(--proof-line);border-radius:14px;overflow:hidden}.instrument-fields div{background:#11151a;padding:16px}.instrument-fields dt{font-size:.61rem;letter-spacing:.13em;text-transform:uppercase;color:#79828a}.instrument-fields dd{margin:8px 0 0;color:#e4e8eb;font-size:.86rem}.proof-stages{padding-bottom:130px}.proof-stage{display:grid;grid-template-columns:42px 1fr;gap:26px;min-height:62svh;padding:clamp(34px,5vw,74px) 0;border-top:1px solid var(--proof-line);opacity:.45;transition:opacity .35s ease,transform .35s ease}.proof-stage:first-child{border-top:0}.proof-stage.is-active{opacity:1}.is-enhanced .proof-stage:not(.is-active){transform:translateY(8px)}.stage-index{font-size:.68rem;letter-spacing:.13em;color:var(--proof-dim)}.proof-stage h3{max-width:16ch;margin:8px 0 20px;font-family:Georgia,serif;font-size:clamp(2rem,3.5vw,3.8rem);font-weight:400;letter-spacing:-.04em;line-height:1.04}.proof-stage p:not(.proof-kicker){max-width:590px;color:var(--proof-muted);font-size:1.02rem;line-height:1.72}
.attempt-stack{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}.attempt{position:relative;min-height:310px;padding:26px;border:1px solid var(--proof-line);border-radius:18px;background:linear-gradient(160deg,#15191d,#0e1114);display:flex;flex-direction:column}.attempt>span,.attempt small{font-size:.64rem;letter-spacing:.13em;text-transform:uppercase;color:#858d94}.attempt strong{margin-top:68px;font-family:Georgia,serif;font-size:clamp(2rem,4vw,4.5rem);font-weight:400;letter-spacing:-.04em}.attempt p{max-width:30ch;margin-top:auto;color:var(--proof-muted);line-height:1.55}.attempt small{margin-top:18px;padding-top:14px;border-top:1px solid var(--proof-line)}.attempt-fail strong{color:#d4aaa0}.attempt-pass strong{color:#b7d1b9}.proof-note{max-width:760px;margin:32px 0 0;color:var(--proof-muted);line-height:1.7}
.proof-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--proof-line);border-left:1px solid var(--proof-line)}.proof-field{min-height:250px;padding:24px;border-right:1px solid var(--proof-line);border-bottom:1px solid var(--proof-line);background:rgba(255,255,255,.015)}.proof-field>span{font-size:.64rem;letter-spacing:.12em;color:var(--proof-dim)}.proof-field h3{margin:54px 0 12px;font-family:Georgia,serif;font-size:1.5rem;font-weight:400}.proof-field p{margin:0;color:var(--proof-muted);line-height:1.6;font-size:.94rem}
.class-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.class-grid details{border:1px solid var(--proof-line);border-radius:14px;background:#0f1316}.class-grid summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 24px;color:#e9ecee;font-size:1.02rem}.class-grid summary::-webkit-details-marker{display:none}.class-grid summary span{color:var(--proof-warm);font-size:1.2rem;transition:transform .2s}.class-grid details[open] summary span{transform:rotate(45deg)}.class-grid details p{margin:0;padding:0 24px 24px;color:var(--proof-muted);line-height:1.65}
.proof-boundary-section{display:grid;grid-template-columns:minmax(250px,.5fr) minmax(0,1fr);gap:60px 9vw}.proof-boundary-section h2{max-width:10ch;margin:0;font-size:clamp(2.5rem,5vw,5.2rem);line-height:1}.boundary-columns{display:grid;grid-template-columns:1fr 1fr;gap:34px}.boundary-columns>div{padding-top:22px;border-top:1px solid var(--proof-line-strong)}.boundary-columns h3{font-size:.82rem;text-transform:uppercase;letter-spacing:.1em;color:#dce0e3}.boundary-columns ul{padding-left:18px}.boundary-columns li{margin:16px 0;color:var(--proof-muted);line-height:1.6}
.proof-next{padding-top:clamp(90px,10vw,150px);padding-bottom:clamp(90px,10vw,150px);border-top:1px solid rgba(255,255,255,.1)}.proof-next h2{max-width:13ch;margin:0 0 54px;font-size:clamp(2.4rem,5vw,5.4rem);line-height:1.02}.next-links{border-top:1px solid var(--proof-line-strong)}.next-links a{display:grid;grid-template-columns:190px 1fr 30px;gap:24px;align-items:center;min-height:108px;border-bottom:1px solid var(--proof-line);color:var(--proof-text);text-decoration:none;transition:background .2s,padding .2s}.next-links a:hover{background:rgba(255,255,255,.025);padding-left:14px;padding-right:14px}.next-links span{font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--proof-muted)}.next-links strong{font-family:Georgia,serif;font-size:clamp(1.25rem,2.3vw,2.1rem);font-weight:400}.next-links b{font-size:1.3rem;color:var(--proof-warm)}
.authority-envelope{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin-top:70px}.authority-chip{min-height:190px;padding:20px;border:1px solid var(--proof-line);border-radius:16px;background:linear-gradient(150deg,#15191d,#0d1013)}.authority-chip span{font-size:.62rem;letter-spacing:.13em;color:var(--proof-dim)}.authority-chip strong{display:block;margin-top:66px;font-family:Georgia,serif;font-size:1.5rem;font-weight:400}.authority-chip p{color:var(--proof-muted);font-size:.88rem;line-height:1.55}.authority-result{margin-top:10px;padding:24px;border:1px solid #7f735d;border-radius:16px;background:linear-gradient(90deg,rgba(200,173,127,.09),transparent);display:flex;justify-content:space-between;gap:28px;align-items:center}.authority-result strong{font-family:Georgia,serif;font-size:clamp(1.6rem,3vw,3rem);font-weight:400}.authority-result span{max-width:520px;color:var(--proof-muted);line-height:1.55}
.progress-not-authority{display:grid;grid-template-columns:1fr 1fr;gap:12px}.comparison-panel{padding:30px;border:1px solid var(--proof-line);border-radius:18px;background:#0f1316}.comparison-panel h3{font-family:Georgia,serif;font-weight:400;font-size:2rem;margin:0 0 25px}.comparison-list{display:grid;gap:10px}.comparison-list div{display:flex;justify-content:space-between;gap:18px;padding:14px 0;border-top:1px solid var(--proof-line)}.comparison-list span{color:var(--proof-muted)}.comparison-list strong{font-size:.78rem;letter-spacing:.1em}.comparison-panel.progress strong{color:#aab1b7}.comparison-panel.authority strong{color:#cdb487}
.replay-visual{display:grid;grid-template-columns:1fr auto 1fr;gap:26px;align-items:center;margin-top:60px}.replay-card{min-height:260px;padding:26px;border:1px solid var(--proof-line);border-radius:20px;background:linear-gradient(150deg,#14191d,#0c0f12)}.replay-card span{font-size:.62rem;letter-spacing:.12em;color:var(--proof-dim)}.replay-card strong{display:block;margin-top:80px;font-family:Georgia,serif;font-weight:400;font-size:2.6rem}.replay-card p{color:var(--proof-muted);line-height:1.55}.replay-arrow{font-size:2rem;color:var(--proof-warm)}.replay-card.consumed{border-color:#6d5f4d}.replay-card.rejected{border-color:#744d47}.replay-card.rejected strong{color:#d3a59d}
.failure-timeline{position:relative;display:grid;gap:12px;margin-top:60px}.failure-row{display:grid;grid-template-columns:110px 180px 1fr;gap:24px;align-items:start;padding:24px 0;border-top:1px solid var(--proof-line)}.failure-row>span{font-size:.64rem;letter-spacing:.12em;color:var(--proof-dim)}.failure-row strong{font-family:Georgia,serif;font-weight:400;font-size:1.55rem}.failure-row p{margin:0;color:var(--proof-muted);line-height:1.65;max-width:720px}.failure-row.fail strong{color:#d3a59d}.failure-row.pass strong{color:#b7d1b9}
.recovery-path{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-top:60px}.recovery-step{position:relative;min-height:190px;padding:18px;border:1px solid var(--proof-line);border-radius:14px;background:#101418}.recovery-step span{font-size:.6rem;letter-spacing:.12em;color:#808a93}.recovery-step strong{display:block;margin-top:52px;font-family:Georgia,serif;font-weight:400;font-size:1.25rem}.recovery-step p{font-size:.82rem;color:var(--proof-muted);line-height:1.5}.recovery-step:not(:last-child)::after{content:'→';position:absolute;right:-9px;top:50%;z-index:2;color:var(--proof-warm);font-size:.9rem}
@keyframes ringFloat{0%,100%{transform:rotate(0deg) scale(1)}50%{transform:rotate(7deg) scale(1.025)}}@keyframes ringFloatReverse{0%,100%{transform:rotate(0deg)}50%{transform:rotate(-9deg)}}
@media(max-width:980px){.proof-section-head,.proof-boundary-section{grid-template-columns:1fr}.proof-section-head .proof-kicker{margin-bottom:0}.proof-stage-layout{grid-template-columns:1fr}.proof-instrument{position:relative;top:auto;min-height:560px}.proof-stages{padding-bottom:0}.proof-stage{min-height:auto}.proof-grid{grid-template-columns:1fr 1fr}.attempt-stack{grid-template-columns:1fr}.authority-envelope{grid-template-columns:1fr 1fr}.recovery-path{grid-template-columns:1fr 1fr 1fr}.boundary-columns{grid-template-columns:1fr}.proof-rail{grid-template-columns:repeat(4,1fr)}.proof-rail-node:nth-of-type(n+6){display:none}}
@media(max-width:700px){.depth-head{align-items:flex-start;flex-direction:column;padding:18px 20px}.depth-head nav{gap:4px 14px}.depth-head nav a{font-size:.78rem}.proof-hero,.proof-section,.proof-next{padding-left:20px;padding-right:20px}.proof-hero h1{font-size:clamp(3rem,15vw,5.2rem)}.proof-rail{grid-template-columns:1fr 1fr;gap:20px}.proof-rail-node:nth-of-type(n+4){display:none}.instrument-core{height:330px}.ring-a{width:235px;height:235px}.ring-b{width:180px;height:180px}.ring-c{width:125px;height:125px}.instrument-fields{grid-template-columns:1fr}.proof-grid,.class-grid,.progress-not-authority,.authority-envelope{grid-template-columns:1fr}.proof-field{min-height:210px}.next-links a{grid-template-columns:1fr 24px;gap:8px 20px;padding:22px 0}.next-links span{grid-column:1}.next-links strong{grid-column:1}.next-links b{grid-column:2;grid-row:1/3;align-self:center}.replay-visual{grid-template-columns:1fr}.replay-arrow{transform:rotate(90deg);justify-self:center}.failure-row{grid-template-columns:1fr;gap:8px}.recovery-path{grid-template-columns:1fr}.recovery-step:not(:last-child)::after{right:50%;top:auto;bottom:-15px;transform:rotate(90deg)}}
@media(prefers-reduced-motion:reduce){.proof-rail-line span,.proof-stage,.core-ring,.class-grid summary span,.next-links a{transition:none!important;animation:none!important}.proof-instrument{position:relative;top:auto}.proof-stage{opacity:1;transform:none!important}}