:root{
  --bg:#171411; --panel:#241f1b; --panel2:#302821; --ink:#f4eddf; --muted:#b7ab9a;
  --trav:#d3bea0; --bronze:#b7894d; --terra:#a9553f; --red:#6f2d29; --blue:#49788a;
  --green:#6d936d; --amber:#bc8847; --line:rgba(211,190,160,.2); --shadow:0 22px 55px rgba(0,0,0,.32);
  --radius:22px; --max:980px;
}
*{box-sizing:border-box}
html{background:var(--bg);color-scheme:dark;scroll-behaviour:smooth}
body{margin:0;background:radial-gradient(circle at 20% 0%,#30251f 0,#171411 37rem),var(--bg);color:var(--ink);font:16px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;min-height:100vh}
button,input{font:inherit}
button{color:inherit}
a{color:var(--trav)}
.app-shell{min-height:100vh;padding-bottom:calc(78px + env(safe-area-inset-bottom))}
.topbar{position:sticky;top:0;z-index:20;height:calc(68px + env(safe-area-inset-top));padding:env(safe-area-inset-top) 18px 0;display:flex;align-items:center;justify-content:space-between;background:linear-gradient(180deg,rgba(23,20,17,.98),rgba(23,20,17,.86));backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.brand-button{border:0;background:none;padding:0;display:flex;align-items:center;gap:10px;text-align:left;cursor:pointer}
.brand-button strong{font:700 13px/1.1 Georgia,serif;letter-spacing:.13em;display:block}.brand-button small{display:block;color:var(--muted);font-size:10px;margin-top:3px}
.brand-mark{width:36px;height:36px;border:1px solid var(--bronze);border-radius:50%;display:grid;place-items:center;font:700 20px Georgia,serif;color:var(--trav);box-shadow:inset 0 0 0 4px rgba(183,137,77,.08)}
.topbar-actions{display:flex;gap:8px;align-items:center}.status-pill{font-size:9px;letter-spacing:.14em;color:#cfe4cd;border:1px solid rgba(109,147,109,.4);background:rgba(109,147,109,.12);padding:6px 8px;border-radius:999px}.icon-btn{border:1px solid var(--line);background:#211d19;border-radius:12px;width:42px;height:38px;cursor:pointer}
#main{width:min(100%,var(--max));margin:auto;padding:18px 16px 38px;outline:none}
.bottom-nav{position:fixed;z-index:30;bottom:0;left:0;right:0;height:calc(72px + env(safe-area-inset-bottom));padding:7px 10px env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(4,1fr);gap:4px;background:rgba(23,20,17,.96);backdrop-filter:blur(22px);border-top:1px solid var(--line)}
.nav-item{border:0;background:none;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:#8f8579;font-size:10px;cursor:pointer;border-radius:14px}.nav-item.active{color:var(--trav);background:rgba(183,137,77,.08)}.nav-glyph{font-size:20px;line-height:1}
.hero{position:relative;overflow:hidden;border-radius:28px;min-height:390px;background:#302720;box-shadow:var(--shadow);border:1px solid rgba(211,190,160,.18);isolation:isolate}.hero-image{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:saturate(.9) contrast(1.02)}.hero:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,7,6,.07) 8%,rgba(13,11,9,.25) 42%,rgba(13,11,9,.94) 100%);z-index:1}.hero-content{position:relative;z-index:2;padding:200px 22px 22px;min-height:390px;display:flex;flex-direction:column;justify-content:flex-end}.eyebrow{color:var(--trav);font-size:11px;font-weight:800;letter-spacing:.16em;text-transform:uppercase}.display{font:700 clamp(34px,8vw,58px)/.98 Georgia,"Times New Roman",serif;margin:8px 0 10px;max-width:780px;text-wrap:balance}.hero p{max-width:720px;color:#e0d6c6;margin:0 0 17px}.hero-actions{display:flex;flex-wrap:wrap;gap:10px}.button{border:1px solid rgba(211,190,160,.3);background:#392d25;padding:12px 16px;border-radius:14px;font-weight:700;cursor:pointer;min-height:46px}.button.primary{background:linear-gradient(180deg,#b7894d,#936834);color:#1b1511;border-color:#c9a46d}.button.secondary{background:rgba(24,20,17,.76);backdrop-filter:blur(6px)}.button.ghost{background:transparent}.button:disabled{opacity:.45;cursor:not-allowed}
.section{margin:24px 0}.section-head{display:flex;justify-content:space-between;gap:14px;align-items:end;margin-bottom:12px}.section-head h2{margin:0;font:700 25px Georgia,serif}.section-head p{margin:0;color:var(--muted);font-size:13px}.section-title{font:700 27px Georgia,serif;margin:0 0 6px}.lede{font-size:17px;color:#ddd2c2;margin:0;max-width:760px}.subtle{color:var(--muted);font-size:13px}.rule{height:1px;background:var(--line);margin:18px 0}
.progress-bar{height:8px;background:#312a25;border-radius:999px;overflow:hidden}.progress-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--terra),var(--bronze));border-radius:inherit;transition:width .35s ease}.progress-copy{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-top:7px}
.chapter-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.chapter-card{position:relative;border:1px solid var(--line);background:linear-gradient(145deg,#2b241f,#1f1b18);border-radius:20px;padding:17px;min-height:160px;text-align:left;cursor:pointer;overflow:hidden}.chapter-card.locked{opacity:.5}.chapter-card.complete{border-color:rgba(183,137,77,.55)}.chapter-number{font:700 40px Georgia,serif;color:rgba(211,190,160,.18);position:absolute;right:12px;top:5px}.chapter-card h3{font:700 19px Georgia,serif;margin:18px 0 7px;max-width:82%}.chapter-card p{font-size:12px;color:var(--muted);margin:0}.chapter-status{margin-top:14px;font-size:10px;letter-spacing:.12em;font-weight:800;color:var(--bronze)}
.chapter-hero{position:relative;border-radius:26px;overflow:hidden;min-height:340px;background:#2a231e;box-shadow:var(--shadow)}.chapter-hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.chapter-hero:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.08),rgba(15,12,10,.89))}.chapter-hero-content{position:relative;z-index:2;padding:175px 21px 20px;min-height:340px;display:flex;flex-direction:column;justify-content:flex-end}.chapter-hero h1{font:700 37px/1 Georgia,serif;margin:7px 0 9px}.chapter-hero p{margin:0;color:#e5d8c8}.chapter-toolbar{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap}.confidence{display:inline-flex;align-items:center;gap:6px;font-size:10px;font-weight:800;letter-spacing:.09em;color:#d7e7d1}.confidence:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--green)}
.stepper{display:flex;gap:6px;margin:16px 0}.step-dot{flex:1;height:5px;background:#3a312a;border-radius:99px}.step-dot.done{background:var(--bronze)}.step-dot.current{background:var(--trav)}
.activity{background:linear-gradient(180deg,#28211d,#201b18);border:1px solid var(--line);border-radius:24px;padding:20px;box-shadow:0 14px 35px rgba(0,0,0,.2)}.activity h2{font:700 28px Georgia,serif;margin:4px 0 8px}.activity .prompt{font-size:17px;color:#e2d7c8;margin:0 0 18px}.engine-tag{font-size:10px;color:var(--bronze);letter-spacing:.14em;font-weight:800;text-transform:uppercase}.options{display:grid;gap:9px}.option{width:100%;text-align:left;border:1px solid rgba(211,190,160,.19);background:#312923;border-radius:15px;padding:14px 15px;cursor:pointer;min-height:52px}.option:hover,.option:focus-visible{border-color:var(--bronze);outline:none}.option.correct{border-color:var(--green);background:rgba(109,147,109,.14)}.option.wrong{border-color:var(--terra);background:rgba(169,85,63,.14)}
.feedback{margin-top:16px;padding:15px;border-radius:16px;background:#171411;border-left:3px solid var(--bronze)}.feedback.good{border-color:var(--green)}.feedback.try{border-color:var(--terra)}.feedback strong{display:block;margin-bottom:4px}.feedback p{margin:0;color:#d8cebf}.feedback-actions{margin-top:13px;display:flex;gap:8px;flex-wrap:wrap}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-bottom:12px}.compare-zone{border:1px dashed rgba(211,190,160,.3);border-radius:15px;padding:10px;min-height:76px}.compare-zone strong{font-size:10px;letter-spacing:.1em;color:var(--trav)}.sort-items{display:grid;gap:8px}.sort-item{border:1px solid var(--line);background:#302822;border-radius:13px;padding:12px;cursor:pointer}.sort-item.assigned-left{box-shadow:inset 4px 0 var(--blue)}.sort-item.assigned-right{box-shadow:inset -4px 0 var(--terra)}.sort-controls{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:7px}.sort-controls button{font-size:12px;padding:8px;border-radius:10px;border:1px solid var(--line);background:#211c18}
.order-list{display:grid;gap:8px}.order-item{display:flex;gap:10px;align-items:center;border:1px solid var(--line);background:#302822;padding:11px;border-radius:13px;cursor:pointer}.order-num{width:28px;height:28px;border-radius:50%;background:#171411;color:var(--bronze);display:grid;place-items:center;font-weight:800}.order-chosen{margin:12px 0;border:1px dashed rgba(211,190,160,.22);border-radius:15px;padding:10px;min-height:58px}.order-chip{display:inline-flex;background:#46372c;border-radius:999px;padding:7px 10px;margin:3px;font-size:12px}
.route-list{display:grid;gap:10px}.route-card{border:1px solid var(--line);border-radius:16px;padding:14px;background:#2f2822;cursor:pointer}.route-card strong{display:block}.route-card span{color:var(--muted);font-size:13px}.route-card:before{content:"→";float:right;color:var(--bronze);font-size:22px}
.clue-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.clue{min-height:112px;border:1px solid var(--line);background:#2b241f;border-radius:16px;padding:12px;cursor:pointer;text-align:left}.clue.revealed{background:#3a3028;border-color:rgba(183,137,77,.45)}.clue strong{display:block;color:var(--trav);margin-bottom:5px}.clue span{color:var(--muted);font-size:12px}.clue:not(.revealed) span{filter:blur(5px);opacity:.4;user-select:none}
.gradient-wrap{padding:12px 0}.channel{height:150px;position:relative;margin:10px 0 18px;background:linear-gradient(#23333a 0 38%,#4a3b2c 39% 100%);border-radius:16px;overflow:hidden}.channel-line{position:absolute;left:7%;right:7%;height:5px;background:#71bdd7;transform-origin:left center;top:52%;box-shadow:0 0 12px rgba(113,189,215,.4)}.gradient-controls label{display:grid;grid-template-columns:90px 1fr 40px;gap:10px;align-items:center;margin:10px 0;color:var(--muted);font-size:12px}.gradient-controls input{accent-color:var(--bronze);width:100%}
.map-shell{position:relative;aspect-ratio:4/5;max-height:690px;border-radius:28px;overflow:hidden;background:radial-gradient(circle at 48% 45%,#6d5b45 0,#4a3d30 34%,#2d2722 72%);border:1px solid var(--line);box-shadow:var(--shadow)}.map-shell:before{content:"";position:absolute;inset:0;background:linear-gradient(25deg,transparent 49%,rgba(255,255,255,.035) 50%,transparent 51%) 0 0/24px 24px;opacity:.5}.tiber{position:absolute;left:17%;top:-6%;width:14%;height:116%;border-radius:50%;border-left:18px solid rgba(73,120,138,.84);transform:rotate(7deg);filter:drop-shadow(0 0 8px rgba(73,120,138,.25))}.hill{position:absolute;width:25%;height:16%;border-radius:50%;background:radial-gradient(ellipse,rgba(151,125,86,.28),transparent 70%);border:1px solid rgba(211,190,160,.08)}.map-point{position:absolute;transform:translate(-50%,-50%);border:0;background:none;cursor:pointer;text-align:center;z-index:3}.pin{width:18px;height:18px;border-radius:50%;display:block;margin:auto;border:2px solid #efe3ca;background:var(--green);box-shadow:0 0 0 5px rgba(0,0,0,.18)}.map-point.partial .pin{background:var(--amber)}.map-point.composite .pin{background:var(--blue)}.map-point.locked .pin{background:#625b53}.map-label{display:block;font-size:9px;font-weight:800;color:#fff;text-shadow:0 1px 4px #000;margin-top:4px;white-space:nowrap}.map-legend{position:absolute;left:12px;bottom:12px;right:12px;padding:11px;border-radius:13px;background:rgba(24,20,17,.85);backdrop-filter:blur(8px);font-size:10px;color:var(--muted);z-index:5}.map-legend span{display:inline-flex;align-items:center;gap:4px;margin-right:10px}.map-legend i{width:8px;height:8px;border-radius:50%;background:var(--green);display:inline-block}.map-legend .p i{background:var(--amber)}.map-legend .c i{background:var(--blue)}
.discovery-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.discovery-card{border:1px solid var(--line);background:#29221d;border-radius:18px;padding:15px;min-height:135px;cursor:pointer;text-align:left}.discovery-card.locked{opacity:.34;filter:grayscale(.8)}.discovery-type{font-size:9px;letter-spacing:.12em;color:var(--bronze);font-weight:800}.discovery-card h3{font:700 18px Georgia,serif;margin:8px 0}.discovery-card p{font-size:12px;color:var(--muted);margin:0}
.timeline{position:relative;padding-left:26px}.timeline:before{content:"";position:absolute;left:8px;top:8px;bottom:8px;width:2px;background:linear-gradient(var(--terra),var(--bronze),#6e665c)}.time-card{position:relative;background:#29221d;border:1px solid var(--line);border-radius:17px;padding:14px;margin:0 0 11px}.time-card:before{content:"";position:absolute;width:12px;height:12px;border-radius:50%;background:var(--bronze);left:-24px;top:20px;box-shadow:0 0 0 4px var(--bg)}.time-date{color:var(--bronze);font-weight:800;font-size:11px;letter-spacing:.07em}.time-card h3{font:700 18px Georgia,serif;margin:3px 0 5px}.time-card p{font-size:13px;color:var(--muted);margin:0}
.replay-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.mode-card{border:1px solid var(--line);background:linear-gradient(145deg,#312821,#211c19);padding:16px;border-radius:18px;cursor:pointer;text-align:left;min-height:130px}.mode-card h3{font:700 18px Georgia,serif;margin:7px 0}.mode-card p{font-size:12px;color:var(--muted);margin:0}.mode-icon{font-size:23px;color:var(--bronze)}
.now-then{position:relative;border-radius:24px;overflow:hidden;background:#1f1a17;box-shadow:var(--shadow);aspect-ratio:3/2}.now-then img{width:100%;height:100%;object-fit:cover}.now-then .label{position:absolute;top:12px;left:12px;background:rgba(18,15,13,.82);padding:8px 10px;border-radius:11px;font-size:10px;letter-spacing:.12em;font-weight:800}.now-then .evidence-btn{position:absolute;right:12px;bottom:12px}
.source-list{display:grid;gap:9px}.source-item{border:1px solid var(--line);padding:12px;border-radius:13px;background:#211c18}.source-item a{font-size:13px;font-weight:700}.source-item small{display:block;color:var(--muted);margin-top:3px}
.modal{width:min(92vw,620px);max-height:84vh;background:#211c18;color:var(--ink);border:1px solid rgba(211,190,160,.25);border-radius:24px;padding:0;box-shadow:0 40px 100px rgba(0,0,0,.6)}.modal::backdrop{background:rgba(5,4,3,.72);backdrop-filter:blur(4px)}#modalBody{padding:22px}.modal h2{font:700 28px Georgia,serif;margin:0 0 8px}.modal p{color:#ded4c5}.modal-close{float:right}
.toast{position:fixed;left:50%;bottom:calc(88px + env(safe-area-inset-bottom));transform:translate(-50%,20px);background:#efe5d3;color:#241d18;padding:10px 14px;border-radius:13px;font-weight:800;font-size:12px;opacity:0;pointer-events:none;transition:.2s;z-index:60;box-shadow:var(--shadow)}.toast.show{opacity:1;transform:translate(-50%,0)}
.certificate{text-align:center;padding:28px;border:1px solid rgba(183,137,77,.55);background:radial-gradient(circle at top,#403124,#211b18 70%);border-radius:26px}.certificate .seal{width:100px;height:100px;border-radius:50%;border:2px solid var(--bronze);box-shadow:inset 0 0 0 7px rgba(183,137,77,.1);display:grid;place-items:center;margin:0 auto 16px;font:700 39px Georgia,serif;color:var(--trav)}.certificate h2{font:700 34px Georgia,serif;margin:5px 0}.certificate p{color:var(--muted)}
@media (min-width:760px){#main{padding:24px 24px 50px}.chapter-grid{grid-template-columns:repeat(4,1fr)}.chapter-card{min-height:185px}.discovery-grid{grid-template-columns:repeat(3,1fr)}.replay-grid{grid-template-columns:repeat(3,1fr)}.bottom-nav{left:50%;right:auto;transform:translateX(-50%);width:min(700px,92vw);bottom:12px;border:1px solid var(--line);border-radius:22px;height:68px;padding:6px}.app-shell{padding-bottom:100px}.topbar{padding-left:28px;padding-right:28px}.hero{min-height:470px}.hero-content{min-height:470px;padding-top:275px}}
@media (max-width:520px){.clue-grid{grid-template-columns:1fr}.hero{min-height:430px}.hero-content{min-height:430px}.chapter-grid,.discovery-grid{grid-template-columns:1fr 1fr}.display{font-size:42px}.compare-grid{grid-template-columns:1fr}.map-label{font-size:8px}.activity{padding:17px}}
@media (prefers-reduced-motion:reduce){*{scroll-behaviour:auto!important;transition:none!important;animation:none!important}}