/* ============================================================
   THE CIPHER MUSEUM — Master Stylesheet v1.0
   Aesthetic: Smithsonian Dark / Scholarly Gold
   Fonts: Cinzel · Cormorant Garamond · JetBrains Mono
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;0,700;1,300;1,400;1,600&family=JetBrains+Mono:wght@300;400;500;700&family=Cinzel:wght@400;600;700&display=swap');

:root {
  --black:#060608;--s1:#0d0d0f;--s2:#141418;--s3:#1c1c22;--s4:#242430;--s5:#2e2e3a;
  --gold:#C9A84C;--gold-lt:#E8C97A;--gold-pale:#F5E4B0;--gold-dim:#9A8044;--gold-deep:#4a3d1c;
  --gold-glow:rgba(201,168,76,.10);--gold-glg:rgba(201,168,76,.18);--gold-b:rgba(201,168,76,.22);
  --tx:#EDE5D4;--tx2:#B8B0A0;--tx3:#9990A3;
  --red:#C85A5A;--red-d:rgba(200,90,90,.12);--red-b:rgba(200,90,90,.25);
  --orange:#C8905A;--green:#5AC8A0;--purple:#A07FCC;
  --purple-d:rgba(160,127,204,.12);--purple-b:rgba(160,127,204,.28);
  --blue:#5A90C8;--blue-d:rgba(90,144,200,.12);
  --fd:'Cinzel',serif;--fb:'Cormorant Garamond',serif;--fm:'JetBrains Mono',monospace;
  --r:4px;--rl:10px;--rx:16px;--r-sm:3px;
  --sh:0 8px 32px rgba(0,0,0,.5),0 1px 0 rgba(255,255,255,.03);
  --tr:180ms ease;--trs:350ms ease;
  /* Visual identity aliases (Phase 2C) */
  --color-parchment:#f5f0e8;--color-brass:#b8960c;--color-ink:#1a1208;--color-patina:#2d5a4b;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{background:var(--black);background-image:radial-gradient(ellipse 70% 50% at 15% 5%,rgba(201,168,76,.05) 0%,transparent 60%),radial-gradient(ellipse 60% 40% at 85% 95%,rgba(201,168,76,.03) 0%,transparent 60%);color:var(--tx);font-family:var(--fb);font-weight:400;font-size:1.15rem;line-height:1.8;min-height:100vh;-webkit-font-smoothing:antialiased}
.skip-link{position:absolute;left:1rem;top:-3rem;z-index:400;background:var(--gold);color:var(--black);padding:.75rem 1rem;border-radius:var(--r);font-family:var(--fm);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;box-shadow:var(--sh);transition:top var(--tr)}
.skip-link:focus{top:1rem}
.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}
h1,h2,h3,h4{font-family:var(--fd);font-weight:400;letter-spacing:.04em;line-height:1.2}
h1{font-size:clamp(2.2rem,5vw,4rem)}h2{font-size:clamp(1.5rem,3.5vw,2.4rem)}h3{font-size:clamp(1.1rem,2.5vw,1.5rem)}
p{color:var(--tx2);line-height:1.85;font-weight:400}
a{color:var(--gold);text-decoration:none;transition:color var(--tr)}a:hover{color:var(--gold-lt)}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--gold-lt);outline-offset:3px;border-radius:var(--r)}
strong{color:var(--tx);font-weight:600}em{color:var(--gold-lt);font-style:italic}
code,kbd{font-family:var(--fm);font-size:.88em;background:var(--s3);border:1px solid var(--s5);padding:.12em .4em;border-radius:3px;color:var(--gold-lt)}
pre{font-family:var(--fm);font-size:.88rem;background:var(--s2);border:1px solid var(--s4);border-radius:var(--rl);padding:1.25rem 1.5rem;overflow-x:auto;color:var(--tx);line-height:1.8}
.container{max-width:1360px;margin:0 auto;padding:0 2rem}
.divider{height:1px;background:linear-gradient(90deg,transparent,var(--gold-dim) 30%,var(--gold-dim) 70%,transparent);opacity:.4;margin:2.5rem 0}
.mono{font-family:var(--fm)}
/* NAV */
.museum-nav{position:sticky;top:0;z-index:200;background:rgba(6,6,8,.9);backdrop-filter:blur(16px);border-bottom:1px solid var(--gold-b)}
.nav-inner{max-width:1360px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 2rem;height:62px}
.nav-logo{display:flex;align-items:center;gap:.8rem;text-decoration:none;flex-shrink:0}
.nav-logo-icon{width:30px;height:30px;color:var(--gold)}
.nav-logo-text{font-family:var(--fd);font-size:1.15rem;font-weight:600;letter-spacing:.1em;color:var(--tx);text-transform:uppercase}
.nav-links{display:flex;gap:.25rem;list-style:none}
.nav-links a{font-family:var(--fd);font-size:.82rem;letter-spacing:.06em;text-transform:uppercase;color:var(--tx2);padding:.55rem 1rem;border-radius:var(--r);transition:all var(--tr)}
.nav-links a:hover,.nav-links a.active{color:var(--gold);background:var(--gold-glow)}
/* TICKER */
.ticker-strip{background:var(--s1);border-bottom:1px solid var(--s4);padding:.85rem 0;overflow:hidden}
.ticker-track{display:flex;gap:4rem;animation:ticker 55s linear infinite;width:max-content}
.ticker-item{font-family:var(--fm);font-size:.82rem;letter-spacing:.18em;text-transform:uppercase;color:var(--tx2);white-space:nowrap;display:flex;align-items:center;gap:.6rem;text-decoration:none;transition:color var(--tr)}
.ticker-item:hover{color:var(--gold)}
.ticker-dot{color:var(--gold);font-size:.55rem}
@keyframes ticker{from{transform:translateX(0)}to{transform:translateX(-50%)}}
/* HERO */
.entrance-hero{position:relative;min-height:92vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;overflow:hidden;padding:4rem 2rem 5rem}
.hero-ring{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);border:1px solid var(--gold-b);border-radius:50%;animation:pulseRing 6s ease-in-out infinite}
.hero-ring:nth-child(1){width:600px;height:600px;opacity:.15}
.hero-ring:nth-child(2){width:900px;height:900px;opacity:.08;animation-delay:1.5s}
.hero-ring:nth-child(3){width:1200px;height:1200px;opacity:.04;animation-delay:3s}
@keyframes pulseRing{0%,100%{transform:translate(-50%,-50%) scale(1)}50%{transform:translate(-50%,-50%) scale(1.04)}}
.hero-ciphertext{position:absolute;inset:0;font-family:var(--fm);font-size:.7rem;line-height:2;color:var(--gold);opacity:.025;overflow:hidden;padding:2rem;word-break:break-all;letter-spacing:.15em;pointer-events:none;user-select:none}
.hero-content{position:relative;z-index:2;max-width:860px}
.hero-eyebrow{display:inline-flex;align-items:center;gap:.75rem;font-family:var(--fm);font-size:.68rem;letter-spacing:.3em;text-transform:uppercase;color:var(--gold);margin-bottom:2rem}
.hero-eyebrow::before,.hero-eyebrow::after{content:'';width:40px;height:1px;background:var(--gold-dim)}
.hero-wordmark{font-family:var(--fd);font-size:clamp(3.5rem,10vw,7.5rem);font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--tx);line-height:.9;margin-bottom:.4rem}
.hero-sub{font-family:var(--fd);font-size:clamp(1rem,3vw,1.8rem);font-weight:300;font-style:italic;color:var(--gold);letter-spacing:.2em;margin-bottom:2rem}
.hero-desc{font-size:1.15rem;color:var(--tx2);max-width:580px;margin:0 auto 3rem;line-height:1.9}
.hero-stats{display:flex;border:1px solid var(--gold-b);border-radius:var(--rl);overflow:hidden;background:rgba(0,0,0,.3);margin-bottom:3rem;flex-wrap:wrap}
.hero-stat{padding:1.25rem 2.5rem;border-right:1px solid var(--gold-b);text-align:center;flex:1;min-width:120px}
.hero-stat:last-child{border-right:none}
.hero-stat-n{font-family:var(--fd);font-size:2rem;font-weight:600;color:var(--gold);display:block}
.hero-stat-l{font-family:var(--fm);font-size:.6rem;letter-spacing:.2em;text-transform:uppercase;color:var(--tx3)}
.hero-cta{display:inline-flex;align-items:center;gap:.75rem;font-family:var(--fd);font-size:.85rem;letter-spacing:.15em;text-transform:uppercase;color:var(--black);background:var(--gold);padding:1rem 2.5rem;border-radius:var(--r);transition:all var(--trs);font-weight:600}
.hero-cta:hover{background:var(--gold-lt);color:var(--black);transform:translateY(-2px);box-shadow:0 8px 30px rgba(201,168,76,.3)}
.hero-scroll{position:absolute;bottom:2rem;left:50%;transform:translateX(-50%);font-family:var(--fm);font-size:.6rem;letter-spacing:.2em;text-transform:uppercase;color:var(--tx3);display:flex;flex-direction:column;align-items:center;gap:.5rem;animation:bounce 2.5s ease-in-out infinite}
@keyframes bounce{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(6px)}}
/* HALL CARDS */
.hall-previews{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.25rem}
.hall-card{display:block;background:var(--s2);border:1px solid var(--s4);border-radius:var(--rl);padding:2rem;text-decoration:none;position:relative;overflow:hidden;transition:all var(--trs)}
.hall-card::after{content:'';position:absolute;inset:0;background:linear-gradient(135deg,var(--gold-glow) 0%,transparent 60%);opacity:0;transition:opacity var(--trs)}
.hall-card:hover{border-color:var(--gold-b);transform:translateY(-3px);box-shadow:var(--sh)}
.hall-card:hover::after{opacity:1}
.hall-card[data-hall="1"]{border-top:2px solid #C8845A}
.hall-card[data-hall="2"]{border-top:2px solid #C8A85A}
.hall-card[data-hall="3"]{border-top:2px solid #9FC87A}
.hall-card[data-hall="4"]{border-top:2px solid #5A90C8}
.hall-card[data-hall="5"]{border-top:2px solid #C85A5A}
.hall-card[data-hall="cw"]{border-top:2px solid var(--purple)}
.hall-card[data-hall="6"]{border-top:2px solid #C8905A}
.hall-card[data-hall="7"]{border-top:2px solid #5AC8A0}
.hall-card[data-hall="final"]{border-top:2px solid var(--gold)}
.hall-card-num{font-family:var(--fm);font-size:.6rem;letter-spacing:.2em;color:var(--tx3);margin-bottom:.75rem}
.hall-card-title{font-family:var(--fd);font-size:1.25rem;color:var(--tx);margin-bottom:.5rem;letter-spacing:.05em}
.hall-card-era{font-family:var(--fm);font-size:.62rem;letter-spacing:.15em;text-transform:uppercase;color:var(--gold-dim);margin-bottom:1rem;display:block}
.hall-card-desc{font-size:.95rem;color:var(--tx2);line-height:1.7;margin-bottom:1.25rem}
.hall-card-pills{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1.25rem}
.pill{font-family:var(--fm);font-size:.58rem;letter-spacing:.08em;padding:.2em .6em;background:var(--s4);border:1px solid var(--s5);border-radius:2px;color:var(--tx3)}
.hall-card-arrow{font-family:var(--fd);font-size:.75rem;letter-spacing:.1em;text-transform:uppercase;color:var(--gold-dim);transition:all var(--tr);display:flex;align-items:center;gap:.5rem}
.hall-card:hover .hall-card-arrow{color:var(--gold);gap:.75rem}
/* PAGE HERO */
.page-hero{padding:5rem 2rem 3.5rem;background:var(--s1);border-bottom:1px solid var(--gold-b);position:relative;overflow:hidden}
.page-hero::after{content:'';position:absolute;right:0;top:0;bottom:0;width:40%;background:radial-gradient(ellipse at right center,var(--gold-glow) 0%,transparent 70%);pointer-events:none}
.breadcrumb{font-family:var(--fm);font-size:.62rem;letter-spacing:.15em;text-transform:uppercase;color:var(--tx3);margin-bottom:2.5rem;position:relative;z-index:1}
.breadcrumb a{color:var(--gold-dim)}.breadcrumb a:hover{color:var(--gold)}.breadcrumb span{margin:0 .5em;opacity:.4}
.page-eyebrow{font-family:var(--fm);font-size:.65rem;letter-spacing:.25em;text-transform:uppercase;color:var(--gold-dim);margin-bottom:.75rem;display:block;position:relative;z-index:1}
.page-title{font-family:var(--fd);font-size:clamp(2.2rem,6vw,4.5rem);font-weight:600;letter-spacing:.07em;color:var(--tx);margin-bottom:.4rem;position:relative;z-index:1}
.page-tagline{font-family:var(--fb);font-size:1.2rem;font-style:italic;color:var(--gold);margin-bottom:2rem;position:relative;z-index:1}
.page-meta{display:flex;flex-wrap:wrap;gap:.6rem;margin-bottom:1.5rem;position:relative;z-index:1}
.page-num{font-family:var(--fm);font-size:.6rem;letter-spacing:.15em;color:var(--tx3);align-self:center;margin-right:.5rem}
.exhibit-facts{display:flex;flex-wrap:wrap;gap:2.5rem;position:relative;z-index:1}
.fact{display:flex;flex-direction:column;gap:.2rem}
.fact-label{font-family:var(--fm);font-size:.58rem;letter-spacing:.2em;text-transform:uppercase;color:var(--tx3)}
.fact-value{font-family:var(--fb);font-size:1.05rem;font-weight:600;color:var(--tx)}
/* EXHIBIT LAYOUT */
.exhibit-layout{display:grid;grid-template-columns:1fr 420px;gap:2.5rem;max-width:1360px;margin:0 auto;padding:3.5rem 2rem;align-items:start}
.exhibit-main{display:flex;flex-direction:column;gap:2.5rem}
.exhibit-side{display:flex;flex-direction:column;gap:1.75rem;position:sticky;top:78px}
/* PANELS */
.panel{background:var(--s2);border:1px solid var(--s4);border-radius:var(--rl);overflow:hidden}
.panel-head{background:var(--s3);border-bottom:1px solid var(--s4);padding:.9rem 1.5rem;display:flex;align-items:center;gap:.75rem}
.panel-icon{font-size:1rem}.panel-title{font-family:var(--fd);font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;color:var(--tx2)}
.panel-body{padding:1.5rem}.panel-body p{font-size:1rem;line-height:1.85}
/* DEMO PANEL */
.demo-panel{background:var(--s2);border:1px solid var(--gold-b);border-radius:var(--rl);overflow:hidden;box-shadow:0 0 24px rgba(201,168,76,.08)}
.demo-head{background:linear-gradient(135deg,rgba(201,168,76,.14),rgba(201,168,76,.04));border-bottom:1px solid var(--gold-b);padding:1.1rem 1.5rem;display:flex;align-items:center;gap:.75rem}
.demo-title{font-family:var(--fd);font-size:.95rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gold)}
.demo-body{padding:1.5rem;display:flex;flex-direction:column;gap:1.25rem}
.input-group{display:flex;flex-direction:column;gap:.45rem}
.input-label{font-family:var(--fm);font-size:.6rem;letter-spacing:.18em;text-transform:uppercase;color:var(--tx3);display:block}
.museum-input{width:100%;background:var(--s3);border:1px solid var(--s5);border-radius:var(--r);color:var(--tx);font-family:var(--fm);font-size:.92rem;padding:.7rem 1rem;outline:none;resize:vertical;transition:border-color var(--tr)}
.museum-input:focus{border-color:var(--gold-dim)}
.mode-toggle{display:flex;background:var(--s3);border-radius:var(--r);padding:3px;gap:3px}
.mode-btn{flex:1;padding:.45rem;border:none;border-radius:3px;background:none;font-family:var(--fm);font-size:.65rem;letter-spacing:.12em;text-transform:uppercase;color:var(--tx3);cursor:pointer;transition:all var(--tr)}
.mode-btn.active{background:var(--gold);color:var(--black);font-weight:700}
.btn-group{display:flex;gap:.75rem}
.btn{font-family:var(--fd);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;padding:.7rem 1.25rem;border:none;border-radius:var(--r);cursor:pointer;transition:all var(--tr);flex:1}
.btn-primary{background:var(--gold);color:var(--black);font-weight:700}
.btn-primary:hover{background:var(--gold-lt);transform:translateY(-1px);box-shadow:0 4px 16px rgba(201,168,76,.25)}
.btn-secondary{background:var(--s4);color:var(--tx2);border:1px solid var(--s5)}
.btn-secondary:hover{border-color:var(--gold-dim);color:var(--tx)}
.output-box{background:var(--s1);border:1px solid var(--s4);border-radius:var(--r);padding:1rem 1.25rem;min-height:64px;font-family:var(--fm);font-size:.92rem;color:var(--gold-lt);letter-spacing:.1em;word-break:break-all;line-height:1.7}
.output-empty{color:var(--tx3);font-style:italic;font-family:var(--fb);font-size:.9rem;letter-spacing:0}
.range-row{display:flex;align-items:center;gap:1rem}
.museum-range{flex:1;accent-color:var(--gold);height:4px;cursor:pointer}
.range-val{font-family:var(--fm);font-size:1.1rem;font-weight:700;color:var(--gold);min-width:2ch;text-align:center}
/* FREQ CHART */
.freq-chart{display:flex;align-items:flex-end;gap:2px;height:90px}
.freq-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;height:100%;justify-content:flex-end}
.freq-bar{width:100%;min-height:2px;background:var(--gold-dim);border-radius:1px 1px 0 0;transition:height 500ms cubic-bezier(.34,1.56,.64,1),background 200ms ease}
.freq-bar.hi{background:var(--gold)}.freq-bar.md{background:#9A7A40}
.freq-ltr{font-family:var(--fm);font-size:.5rem;color:var(--tx3)}
/* DIAGRAM */
.diagram-wrap{background:var(--s3);border-radius:var(--r);padding:1.5rem;overflow-x:auto;text-align:center}
.diagram-caption{font-family:var(--fm);font-size:.62rem;letter-spacing:.1em;color:var(--tx3);text-align:center;margin-top:1rem;font-style:italic}
/* ALPHABET CELLS */
.alpha-row{display:flex;gap:2px;overflow-x:auto;padding-bottom:4px}
.a-cell{min-width:28px;height:28px;display:flex;align-items:center;justify-content:center;font-family:var(--fm);font-size:.72rem;border-radius:3px;flex-shrink:0;transition:all .3s}
.a-plain{background:var(--s4);color:var(--tx2)}
.a-cipher{background:var(--gold-glow);border:1px solid var(--gold-b);color:var(--gold-lt)}
/* BADGES */
.badge{font-family:var(--fm);font-size:.58rem;letter-spacing:.12em;text-transform:uppercase;padding:.22em .6em;border-radius:2px;white-space:nowrap}
.era-ancient{background:rgba(200,132,90,.15);color:#C8845A;border:1px solid rgba(200,132,90,.3)}
.era-medieval{background:rgba(90,144,200,.12);color:#7AA8D8;border:1px solid rgba(90,144,200,.25)}
.era-renaissance{background:rgba(159,200,122,.12);color:#9FC87A;border:1px solid rgba(159,200,122,.25)}
.era-19c{background:rgba(200,168,90,.12);color:#C8A85A;border:1px solid rgba(200,168,90,.25)}
.era-wwi{background:rgba(200,144,90,.15);color:#D4962A;border:1px solid rgba(200,144,90,.3)}
.era-wwii{background:rgba(200,90,90,.12);color:#C85A5A;border:1px solid rgba(200,90,90,.25)}
.era-coldwar{background:rgba(160,127,204,.12);color:#A07FCC;border:1px solid rgba(160,127,204,.25)}
.era-theoretical{background:rgba(90,200,160,.10);color:#5AC8A0;border:1px solid rgba(90,200,160,.2)}
.sec-broken{background:var(--red-d);color:var(--red);border:1px solid var(--red-b)}
.sec-weak{background:rgba(200,144,90,.12);color:var(--orange);border:1px solid rgba(200,144,90,.3)}
.sec-secure{background:rgba(90,200,160,.10);color:var(--green);border:1px solid rgba(90,200,160,.3)}
.badge-hard{background:rgba(212,150,42,.12);color:#D4962A;border:1px solid rgba(212,150,42,.3)}
.badge-civil{background:var(--purple-d);color:var(--purple);border:1px solid var(--purple-b)}
/* ATTACK PANEL */
.attack-panel{background:var(--red-d);border:1px solid var(--red-b);border-left:3px solid var(--red);border-radius:var(--rl);padding:1.5rem;margin-bottom:1rem}
.attack-name{font-family:var(--fd);font-size:1.1rem;color:var(--red);margin-bottom:.3rem;font-weight:600;letter-spacing:.04em}
.attack-diff{font-family:var(--fm);font-size:.6rem;letter-spacing:.15em;text-transform:uppercase;color:var(--tx3);margin-bottom:.75rem}
.attack-desc{font-size:1rem;color:var(--tx2);line-height:1.8}
/* STEPS */
.steps{list-style:none;display:flex;flex-direction:column;gap:1rem;counter-reset:steps}
.step{display:flex;gap:1rem;align-items:flex-start;counter-increment:steps}
.step::before{content:counter(steps);font-family:var(--fm);font-size:.7rem;color:var(--gold);background:var(--gold-glow);border:1px solid var(--gold-b);width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:3px}
.step-text{font-size:1rem;color:var(--tx2);line-height:1.8;padding-top:2px}
/* CALLOUTS */
.callout{display:flex;gap:1rem;padding:1.25rem 1.5rem;border-radius:var(--rl);margin:1.5rem 0}
.callout-info{background:var(--blue-d);border:1px solid rgba(90,144,200,.3);border-left:3px solid var(--blue)}
.callout-warn{background:rgba(200,144,90,.12);border:1px solid rgba(200,144,90,.3);border-left:3px solid var(--orange)}
.callout-danger{background:var(--red-d);border:1px solid var(--red-b);border-left:3px solid var(--red)}
.callout-success{background:rgba(90,200,160,.10);border:1px solid rgba(90,200,160,.3);border-left:3px solid var(--green)}
.callout-mystery{background:var(--purple-d);border:1px solid var(--purple-b);border-left:3px solid var(--purple)}
.callout-icon{font-size:1.25rem;flex-shrink:0;line-height:1.6}
.callout-body p{font-size:1rem;line-height:1.75}
/* CIPHER TABLE */
.cipher-table{width:100%;border-collapse:collapse;font-family:var(--fm);font-size:.85rem}
.cipher-table th{padding:.5rem .75rem;text-align:left;font-size:.6rem;letter-spacing:.15em;text-transform:uppercase;color:#ADA6B6;border-bottom:1px solid var(--s4);font-weight:400}
.cipher-table td{padding:.55rem .75rem;color:#CFC8B8;border-bottom:1px solid rgba(255,255,255,.025)}
.cipher-table td:first-child{color:var(--gold-lt);font-weight:500}
.cipher-table tr:last-child td{border-bottom:none}
/* GALLERY */
.cipher-gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:1.25rem}
.cipher-card{background:var(--s2);border:1px solid var(--s4);border-radius:var(--rl);padding:1.75rem;text-decoration:none;display:flex;flex-direction:column;gap:1rem;transition:all var(--trs);position:relative;overflow:hidden}
.cipher-card::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--gold-dim),transparent);opacity:0;transition:opacity var(--trs)}
.cipher-card:hover{border-color:var(--gold-b);background:var(--s3);transform:translateY(-3px);box-shadow:var(--sh)}
.cipher-card:hover::before{opacity:1}
.card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:.75rem}
.card-num{font-family:var(--fm);font-size:.6rem;letter-spacing:.12em;color:var(--tx3)}
.card-name{font-family:var(--fd);font-size:1.3rem;letter-spacing:.04em;color:var(--tx);line-height:1.2}
.card-desc{font-size:.95rem;color:var(--tx2);line-height:1.7;flex:1}
.card-foot{display:flex;align-items:center;justify-content:space-between;padding-top:.75rem;border-top:1px solid var(--s4)}
.card-badges{display:flex;gap:.4rem;align-items:center;flex-wrap:wrap}
.card-arrow{color:var(--gold-dim);transition:all var(--tr);flex-shrink:0;font-size:1rem}
.cipher-card:hover .card-arrow{color:var(--gold);transform:translateX(4px)}
/* CAT SECTION */
.cat-section{margin-bottom:4rem}
.cat-head{display:flex;align-items:center;gap:1rem;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--s4)}
.cat-icon{width:36px;height:36px;border:1px solid var(--gold-b);border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--gold);font-size:.85rem;background:var(--gold-glow);flex-shrink:0}
.cat-title{font-family:var(--fd);font-size:.95rem;letter-spacing:.12em;text-transform:uppercase;color:var(--tx2)}
.cat-count{font-family:var(--fm);font-size:.62rem;letter-spacing:.1em;color:var(--tx3);margin-left:auto}
/* HALL NAV */
.hall-nav{display:grid;grid-template-columns:1fr 1fr;gap:1rem;padding:3rem 2rem;max-width:1200px;margin:0 auto;border-top:1px solid var(--s4)}
.hall-nav-link{background:var(--s2);border:1px solid var(--s4);border-radius:var(--rl);padding:1.5rem;text-decoration:none;transition:all var(--trs);display:flex;flex-direction:column;gap:.4rem}
.hall-nav-link:hover{border-color:var(--gold-b);background:var(--s3)}
.hall-nav-dir{font-family:var(--fm);font-size:.6rem;letter-spacing:.2em;text-transform:uppercase;color:var(--tx3)}
.hall-nav-name{font-family:var(--fd);font-size:1.1rem;color:var(--gold);letter-spacing:.05em}
.hall-nav-link.next{text-align:right}
/* SECTION */
.section{max-width:1360px;margin:0 auto;padding:4rem 2rem}
.section-head{text-align:center;margin-bottom:3rem}
.section-eyebrow{font-family:var(--fm);font-size:.62rem;letter-spacing:.28em;text-transform:uppercase;color:var(--gold-dim);display:block;margin-bottom:.75rem}
.section-title{font-family:var(--fd);font-size:clamp(1.6rem,3.5vw,2.5rem);color:var(--tx);margin-bottom:.75rem}
.section-sub{font-size:1.05rem;color:var(--tx2);font-style:italic;max-width:600px;margin:0 auto}
/* CHALLENGE */
.challenge-box{background:linear-gradient(135deg,rgba(201,168,76,.06),rgba(201,168,76,.02));border:1px solid var(--gold-b);border-radius:var(--rx);padding:2.5rem;text-align:center}
.challenge-cipher{font-family:var(--fm);font-size:1.1rem;letter-spacing:.2em;color:var(--tx);background:var(--s3);border:1px solid var(--s5);border-radius:var(--r);padding:1.25rem;margin:1.5rem 0;word-break:break-all;line-height:1.8}
/* FOOTER */
.museum-footer{background:var(--s1);border-top:1px solid var(--s4);padding:4rem 2rem 3rem}
.footer-grid{max-width:1360px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr;gap:4rem;margin-bottom:3rem}
.footer-logo-text{font-family:var(--fd);font-size:1.3rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gold-dim);display:block;margin-bottom:1rem}
.footer-brand-desc{font-size:.95rem;color:var(--tx3);line-height:1.8}
.footer-col-title{font-family:var(--fd);font-size:.75rem;letter-spacing:.15em;text-transform:uppercase;color:var(--tx2);margin-bottom:1rem}
.footer-links{list-style:none;display:flex;flex-direction:column;gap:.5rem}
.footer-links a{font-family:var(--fb);font-size:.95rem;color:var(--tx3);transition:color var(--tr)}
.footer-links a:hover{color:var(--gold)}
.footer-bottom{max-width:1360px;margin:0 auto;padding-top:2rem;border-top:1px solid var(--s4);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}
.footer-copy{font-family:var(--fm);font-size:.6rem;letter-spacing:.12em;color:var(--tx3)}
/* UTILITIES */
.page-desc{max-width:680px;font-size:1.1rem;color:var(--tx2);line-height:1.9;position:relative;z-index:1}
.badge-group{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:1.5rem;position:relative;z-index:1}
.hero-cta--ghost{background:transparent;border:1px solid var(--gold-b);color:var(--gold)}
.hero-cta--ghost:hover{background:var(--gold-glow);border-color:var(--gold);color:var(--gold-lt);transform:translateY(-2px);box-shadow:0 8px 30px rgba(201,168,76,.12)}
.section--dark{background:var(--s1);border-top:1px solid var(--s4);border-bottom:1px solid var(--s4)}
.content-narrow{max-width:900px;margin:0 auto}
.content-mid{max-width:1100px;margin:0 auto}
/* ANIMATIONS */
@keyframes fadeUp{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}
.fade-up{animation:fadeUp 600ms ease forwards}
.d1{animation-delay:80ms;opacity:0}.d2{animation-delay:160ms;opacity:0}.d3{animation-delay:240ms;opacity:0}.d4{animation-delay:320ms;opacity:0}
/* FLOOR PLAN */
.fp-marker:hover{background:var(--gold-glow);color:var(--gold-lt);box-shadow:0 0 6px rgba(201,168,76,.25)}
@media(max-width:768px){.fp-grid{grid-template-columns:1fr}.fp-hall{border-right:none}.fp-hall--left{border-right:none}}
/* HERO CTA GROUP */
.hero-content .hero-cta+.hero-cta{margin-top:0}
@media(max-width:600px){.hero-content{display:flex;flex-direction:column;align-items:center}.hero-content .hero-cta{margin-left:0 !important;margin-top:.75rem;width:100%;justify-content:center}.featured-grid{grid-template-columns:1fr !important}#museum-map .panel{min-width:0}#museum-map div[style*="grid-template-columns"]{grid-template-columns:1fr !important}}
@media(min-width:601px) and (max-width:900px){.featured-grid{grid-template-columns:repeat(2,1fr) !important}#museum-map div[style*="grid-template-columns"]{grid-template-columns:repeat(2,1fr) !important}}
/* HAMBURGER NAV */
.nav-hamburger{display:none;background:none;border:none;cursor:pointer;padding:10px;margin-left:auto;width:44px;height:44px;align-items:center;justify-content:center;flex-direction:column;gap:5px;z-index:301}
.hamburger-bar{display:block;width:22px;height:2px;background:var(--tx);border-radius:2px;transition:transform .3s ease,opacity .3s ease}
.nav-open .hamburger-bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-open .hamburger-bar:nth-child(2){opacity:0}
.nav-open .hamburger-bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
/* RESPONSIVE */
/* DEMO SECTION — full-width demo above exhibit content */
.demo-section{max-width:1280px;margin:0 auto;padding:2.5rem 2rem 0}
.demo-section .demo-body{display:grid;grid-template-columns:1fr 1fr;gap:2rem}
.demo-section .demo-col{display:flex;flex-direction:column;gap:1.25rem}
@media(max-width:900px){.demo-section .demo-body{grid-template-columns:1fr}}
@media(max-width:1200px){.exhibit-layout{grid-template-columns:1fr}.exhibit-side{position:static;display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:1.5rem}.demo-panel{order:-1;grid-column:1/-1}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:768px){
  .nav-hamburger{display:flex}
  .nav-links{display:flex !important;flex-direction:column;position:fixed;top:62px;left:0;right:0;bottom:0;background:rgba(6,6,8,.97);backdrop-filter:blur(16px);padding:1.5rem 2rem;gap:0;z-index:300;transform:translateX(100%);transition:transform .3s ease;overflow-y:auto}
  .nav-open .nav-links{transform:translateX(0)}
  .nav-links li{border-bottom:1px solid var(--s4)}
  .nav-links a{display:block;padding:1rem 0;font-size:1rem;min-height:44px;display:flex;align-items:center}
  .hall-nav{grid-template-columns:1fr}.hero-stats{flex-direction:column}.hero-stat{border-right:none;border-bottom:1px solid var(--gold-b)}.footer-grid{grid-template-columns:1fr;gap:2rem}
}
@media(max-width:600px){.section{padding:2.5rem 1rem}.page-hero{padding:3.5rem 1rem 2.5rem}.exhibit-layout{padding:2rem 1rem}.cipher-gallery{grid-template-columns:1fr}.hall-previews{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.ticker-track,.hero-ring,.hero-scroll,.fade-up,.reveal{animation:none !important;opacity:1 !important;transform:none !important}.hero-cta,.hall-card,.cipher-card,.hall-nav-link,.btn,.map-room-card{transition:none !important}}
/* ─── Entrance animations (Phase 2C) ─── */
@keyframes fadeInUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-d1{transition-delay:.1s}.reveal-d2{transition-delay:.2s}.reveal-d3{transition-delay:.3s}
/* Section SVG divider */
.section-divider{display:block;margin:2.5rem auto;width:180px;height:6px;opacity:.35}
.section-divider line{stroke:var(--gold-dim);stroke-width:1.5;stroke-dasharray:8 6}

/* Progress badge */
.progress-badge{position:fixed;bottom:1.25rem;right:1.25rem;background:var(--s2);color:var(--gold-dim);font-family:var(--fm);font-size:.7rem;letter-spacing:.08em;padding:.45rem .9rem;border:1px solid var(--gold-b);border-radius:var(--r-sm);z-index:900;opacity:.85;transition:opacity .2s;cursor:default}
.progress-badge:hover{opacity:1}

/* ─── Museum Map Grid (Gap 1) ─── */
.map-layout{display:grid;grid-template-columns:1fr 380px;gap:4rem;align-items:start}
.map-sidebar{position:sticky;top:78px}
.map-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem;max-width:900px;margin:0 auto}
.map-grid-card{background:var(--s2);border:1px solid var(--s4);border-radius:var(--rl);padding:1.5rem;text-decoration:none;display:flex;flex-direction:column;gap:.6rem;transition:all var(--trs);position:relative;overflow:hidden}
.map-grid-card::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--gold-dim),transparent);opacity:0;transition:opacity var(--trs)}
.map-grid-card:hover{border-color:var(--gold-b);background:var(--s3);transform:translateY(-3px);box-shadow:var(--sh)}
.map-grid-card:hover::before{opacity:1}
.map-grid-card--entrance{grid-column:1/-1;text-align:center;background:var(--s2);border-color:var(--gold-b);box-shadow:inset 0 0 20px rgba(201,168,76,.06)}
.map-grid-card--special{border-color:var(--purple-b)}
.map-grid-card--special .map-grid-num{border-color:var(--purple-b);color:var(--purple);background:var(--purple-d)}
.map-grid-card--final{border-color:var(--gold-b)}
.map-grid-card--lab{border-color:rgba(90,200,160,.25)}
.map-grid-card--lab .map-grid-num{border-color:rgba(90,200,160,.35);color:var(--green);background:rgba(90,200,160,.08)}
.map-grid-num{width:40px;height:40px;border:1px solid var(--gold-b);border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--fd);font-size:.85rem;color:var(--gold);flex-shrink:0;background:var(--gold-glow)}
.map-grid-name{font-family:var(--fd);font-size:1.05rem;color:var(--tx);letter-spacing:.04em}
.map-grid-era{font-family:var(--fm);font-size:.6rem;letter-spacing:.1em;color:var(--tx3)}
.map-grid-count{font-family:var(--fm);font-size:.62rem;color:var(--gold-dim);margin-top:auto}
.map-flow-arrow{grid-column:1/-1;text-align:center;color:var(--gold-dim);font-size:1.2rem;line-height:1;opacity:.5}
@media(max-width:900px){.map-layout{grid-template-columns:1fr;gap:2rem}.map-sidebar{position:static}}
@media(max-width:768px){.map-grid{grid-template-columns:1fr 1fr}}
@media(max-width:500px){.map-grid{grid-template-columns:1fr}}

/* ─── Museum Map Floor Plan (extracted inline styles — Gap 4) ─── */
.fp-entrance{background:var(--s2);border:2px solid var(--gold-b);border-radius:var(--rl) var(--rl) 0 0;padding:1.5rem;text-align:center;margin-bottom:0;box-shadow:inset 0 0 20px rgba(201,168,76,.08);position:relative}
.fp-entrance-badge{position:absolute;top:.6rem;left:1rem;font-family:var(--fm);font-size:.55rem;letter-spacing:.15em;color:var(--gold);background:var(--s1);padding:.2rem .6rem;border:1px solid var(--gold-b);border-radius:var(--r-sm)}
.fp-entrance-title{font-family:var(--fd);font-size:1.4rem;color:var(--gold);letter-spacing:.12em;margin-top:.5rem}
.fp-entrance-sub{font-family:var(--fm);font-size:.65rem;color:var(--tx3);letter-spacing:.2em;margin-top:.4rem}
.fp-entrance-arrow{display:block;margin:.75rem auto 0;opacity:.4}
.fp-entrance-enter{font-family:var(--fm);font-size:.5rem;letter-spacing:.2em;color:var(--tx3);margin-top:.15rem}
.fp-grid{display:grid;grid-template-columns:1fr 1fr;gap:0;border:2px solid var(--gold-b);border-top:none;border-radius:0 0 var(--rl) var(--rl);overflow:hidden;box-shadow:0 4px 24px rgba(0,0,0,.3),inset 0 0 30px rgba(26,18,8,.12)}
.fp-hall{padding:1.5rem;background:var(--s1);position:relative;border-bottom:2px solid var(--s4)}
.fp-hall--left{border-right:2px solid var(--s4)}
.fp-hall-label{font-family:var(--fd);font-size:1rem;color:var(--gold-dim);letter-spacing:.08em;margin-bottom:.25rem}
.fp-hall-sub{font-family:var(--fm);font-size:.6rem;color:var(--tx3);letter-spacing:.15em;margin-bottom:1rem}
.fp-hall-list{display:flex;flex-direction:column;gap:.5rem}
.fp-marker{display:flex;align-items:center;gap:.6rem;padding:.5rem .75rem;border-radius:var(--r);text-decoration:none;color:var(--tx2);transition:all .2s;min-height:44px}
.fp-marker-dot{color:var(--gold);font-size:.7rem}
.fp-compass{display:flex;justify-content:space-between;align-items:center;margin-top:.75rem}
.fp-compass-svg{opacity:.3}
.fp-floor-plan{max-width:900px;margin:0 auto}
.fp-corner{position:absolute;width:18px;height:18px;opacity:.25}
.fp-corner--tr{top:0;right:0;border-bottom:1px solid var(--gold-b);border-left:1px solid var(--gold-b)}
.fp-corner--tl{top:0;left:0;border-bottom:1px solid var(--gold-b);border-right:1px solid var(--gold-b)}
.fp-corner--br{bottom:0;right:0;border-top:1px solid var(--gold-b);border-left:1px solid var(--gold-b)}
.fp-corner--bl{bottom:0;left:0;border-top:1px solid var(--gold-b);border-right:1px solid var(--gold-b)}
.fp-door{position:absolute;top:50%;left:0;width:8px;height:24px;margin-top:-12px;background:var(--s1);border-right:1px solid var(--gold-b);border-top:1px solid var(--gold-b);border-bottom:1px solid var(--gold-b);border-radius:0 var(--r-sm) var(--r-sm) 0}
.fp-door--bottom{position:absolute;top:auto;bottom:0;left:50%;margin-top:0;margin-left:-12px;width:24px;height:8px;border:1px solid var(--gold-b);border-bottom:none;border-radius:var(--r-sm) var(--r-sm) 0 0}
.fp-legend{display:flex;gap:1.5rem;justify-content:center;margin-top:1rem;opacity:.45;font-family:var(--fm);font-size:.55rem;letter-spacing:.1em;color:var(--tx3)}
.fp-legend span{display:flex;align-items:center;gap:.4rem}
.fp-hall{transition:background .3s}
.fp-hall:hover{background:var(--s2)}

/* ─── Related Exhibits (Gap 2) ─── */
.related-exhibits{max-width:1200px;margin:0 auto;padding:2rem 2rem 3rem;border-top:1px solid var(--s4)}
.related-exhibits__heading{font-family:var(--fd);font-size:.75rem;letter-spacing:.2em;text-transform:uppercase;color:var(--tx3);margin-bottom:1.25rem;text-align:center}
.related-exhibits__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem}
.related-card{background:var(--s2);border:1px solid var(--s4);border-radius:var(--rl);padding:1.25rem;text-decoration:none;display:flex;flex-direction:column;gap:.4rem;transition:all var(--trs)}
.related-card:hover{border-color:var(--gold-b);background:var(--s3);transform:translateY(-2px);box-shadow:var(--sh)}
.related-card__number{font-family:var(--fm);font-size:.58rem;letter-spacing:.12em;color:var(--tx3)}
.related-card__name{font-family:var(--fd);font-size:1.05rem;color:var(--gold);letter-spacing:.04em}
.related-card__tag{font-family:var(--fm);font-size:.55rem;letter-spacing:.1em;color:var(--tx3);text-transform:uppercase;margin-top:.25rem}

/* ─── Figure / Diagram Captions (Gap 3) ─── */
.figure{background:var(--s3);border-radius:var(--r);padding:1.5rem;overflow-x:auto;text-align:center;margin-top:1.5rem}
.figure svg,.figure canvas,.figure img{max-width:100%}
.figure-caption{font-family:var(--fm);font-size:.62rem;letter-spacing:.1em;color:var(--tx3);text-align:center;margin-top:1rem;font-style:italic}