/* hero: full-width background, text on the left */
.hero{position:relative;padding:72px 0 56px;background:radial-gradient(ellipse at 85% 0%,rgba(117,199,166,.12),transparent 60%)}
.hero-in{position:relative;z-index:1}
.hero-copy{max-width:620px}
.hero h1{font:500 clamp(38px,5.2vw,62px)/1.04 var(--serif);letter-spacing:-.025em;margin:0 0 18px;text-shadow:0 2px 24px rgba(7,23,22,.6)}
.lede{font-size:18px;color:#d3ddd5;margin:0;max-width:560px}
.lede strong{color:var(--ink);font-weight:600}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero-progress{margin:18px 0 0;font-size:14px;color:var(--muted)}
.hero-progress a{color:var(--gold)}
@media(min-width:761px){
 .hero{min-height:560px;display:flex;align-items:center;padding-bottom:96px;margin-bottom:-56px}
 .hero:before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:url(/assets/hero-bg.webp) right top/cover no-repeat;
  -webkit-mask-image:linear-gradient(90deg,transparent 0%,rgba(0,0,0,.35) 28%,#000 62%),linear-gradient(0deg,transparent 0%,#000 42%);
  -webkit-mask-composite:source-in;mask-image:linear-gradient(90deg,transparent 0%,rgba(0,0,0,.35) 28%,#000 62%),linear-gradient(0deg,transparent 0%,#000 42%);mask-composite:intersect;opacity:.92}
 .hero-in{width:min(1120px,100% - 40px)}
}

/* timeline */
.timeline{position:relative;z-index:1;display:grid;grid-template-columns:6fr 8fr;gap:12px;padding:8px 0 8px}
.tl-group{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:12px 14px}
.tl-label{display:block;font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.tl-chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:13px;padding:4px 10px 4px 6px;border:1px solid var(--line2);border-radius:99px;white-space:nowrap}
.chip b{font-size:10px;color:var(--gold);background:var(--panel2);border-radius:99px;padding:1px 6px}
.chip:hover{border-color:var(--gold)}
.chip.done{background:#1b3a30;border-color:#3d6b5c;color:var(--green)}
.chip.done b{background:var(--green);color:#0b201a}

/* N64 band */
.n64{display:grid;grid-template-columns:1fr 1.5fr;gap:40px;align-items:center;margin-top:56px;padding:32px;border:1px solid var(--line);border-radius:16px;background:linear-gradient(135deg,#0f2a25,#0a1f1c)}
.n64 h2{font:500 30px/1.15 var(--serif);margin:0 0 10px}
.n64-head p.muted{margin:0;font-size:15px}
.stat-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.stat{display:flex;flex-direction:column;padding:18px;border-radius:var(--r);background:var(--bg);border:1px solid var(--line);transition:border-color .15s,transform .15s}
.stat:hover{border-color:var(--gold);transform:translateY(-2px)}
.stat b{font:500 38px/1 var(--serif);color:var(--gold)}
.stat span{font-weight:600;margin-top:6px}
.stat small{color:var(--muted);font-size:12px;margin-top:4px}

/* walkthrough */
.walk{margin-top:72px}
.walk-head{display:flex;justify-content:space-between;align-items:end;gap:24px;flex-wrap:wrap}
.walk h2,.tools h2,.more h2,.faq h2{font:500 clamp(28px,3.4vw,38px)/1.1 var(--serif);letter-spacing:-.015em;margin:0}
.walk-tools{display:flex;align-items:center;gap:12px}
#chapter-search{width:280px;max-width:100%;height:42px;padding:0 14px;background:var(--panel);border:1px solid var(--line2);border-radius:8px}
#chapter-search:focus{outline:none;border-color:var(--gold)}
.walk-progress{position:sticky;top:60px;z-index:10;display:flex;align-items:center;gap:14px;margin:20px 0 4px;padding:10px 0;background:var(--bg);font-size:13px;color:var(--muted)}
.bar{display:block;flex:1;height:6px;border-radius:99px;background:var(--line);overflow:hidden}
.bar span{display:block;height:100%;width:0;background:var(--gold);border-radius:99px;transition:width .25s}
.era{font:600 13px var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--gold);margin:28px 0 12px}
.era span{color:var(--muted);text-transform:none;letter-spacing:0;font-weight:400}
.chapters{display:grid;gap:12px}
.chapter{display:grid;grid-template-columns:56px 1fr;background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:border-color .15s}
.chapter:hover{border-color:var(--line2)}
.chapter.hidden{display:none}
.ch-num{font:500 22px var(--serif);color:var(--gold);text-align:center;padding-top:20px;background:var(--panel2);border-right:1px solid var(--line)}
.chapter.is-done .ch-num{color:#0b201a;background:var(--green)}
.ch-body{padding:18px 22px 14px;min-width:0}
.ch-head{display:flex;align-items:center;flex-wrap:wrap;gap:8px}
.ch-head h3{font:500 23px/1.2 var(--serif);margin:0 6px 0 0}
.ch-head h3 a:hover{color:var(--gold)}
.tag{font-size:11px;color:var(--muted);border:1px solid var(--line2);border-radius:5px;padding:1px 7px}
.tag.gold{color:var(--gold);border-color:var(--gold-d)}
.ch-route{margin:10px 0 14px;color:#cfd9d1;font-size:15px}
.ch-facts{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin:0 0 14px;background:var(--line);border:1px solid var(--line);border-radius:8px;overflow:hidden}
.ch-facts div{background:#0a1e1b;padding:9px 12px}
.ch-facts dt{font-size:10px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted)}
.ch-facts dd{margin:2px 0 0;font-size:13px}
.ch-changes h4{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin:0 0 6px;font-weight:600}
.changes{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.changes li{display:flex;gap:10px;align-items:baseline;font-size:14px;color:#cfd9d1}
.ch-foot{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);font-size:14px}
.done{display:inline-flex;align-items:center;gap:8px;cursor:pointer;color:var(--muted)}
.done input{position:absolute;opacity:0;width:1px;height:1px}
.done span{width:20px;height:20px;border:1.5px solid var(--line2);border-radius:5px;display:grid;place-items:center}
.done input:checked+span{background:var(--green);border-color:var(--green)}
.done input:checked+span:after{content:"✓";color:#0b201a;font-size:13px;font-weight:800}
.done input:focus-visible+span{outline:2px solid var(--gold);outline-offset:2px}
.chapter.is-done .done{color:var(--green)}
.hint summary{cursor:pointer;color:var(--muted);list-style:none}
.hint summary::-webkit-details-marker{display:none}
.hint summary:before{content:"? ";color:var(--gold)}
.hint[open]{flex-basis:100%;order:3}
.hint p{margin:6px 0 0;color:#cfd9d1}
.go{margin-left:auto;color:var(--gold);font-weight:600}

/* tools */
.tools{display:grid;grid-template-columns:1.3fr 1fr;gap:16px;margin-top:72px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:26px}
.panel h2{margin-bottom:18px}
.panel select{display:block;width:100%;height:44px;margin-top:6px;padding:0 12px;background:var(--bg);border:1px solid var(--line2);border-radius:8px}
.next-result{margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}
.next-result h3{font:500 22px/1.2 var(--serif);margin:6px 0 6px}
.next-result p{margin:4px 0;color:#cfd9d1;font-size:15px}
.route-tag{font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--gold)}
.coll{display:grid;grid-template-columns:1fr auto;gap:6px 12px;padding:14px 0;border-bottom:1px solid var(--line)}
.coll b{font-variant-numeric:tabular-nums;color:var(--gold)}
.coll .bar{grid-column:1/-1}
.coll:hover span{color:var(--gold)}
.panel p.small{margin:14px 0 0}.panel p.small a{color:var(--gold)}

/* more */
.more{margin-top:72px}
.more-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:20px}
.more-grid a{padding:18px;border:1px solid var(--line);border-radius:var(--r);background:var(--panel);transition:border-color .15s}
.more-grid a:hover{border-color:var(--gold)}
.more-grid b{display:block;font:500 19px var(--serif)}
.more-grid span{font-size:13px;color:var(--muted)}

/* faq */
.faq{display:grid;grid-template-columns:1fr 2fr;gap:40px;margin-top:72px}
.faq-list details{border-top:1px solid var(--line);padding:14px 0}
.faq-list details:last-child{border-bottom:1px solid var(--line)}
.faq-list summary{cursor:pointer;font-weight:600}
.faq-list p{margin:8px 0 0;color:var(--muted)}
.sources{margin-top:40px;font-size:13px;color:var(--muted)}
.sources summary{cursor:pointer}
.sources h2{display:none}
.sources ul{columns:2;padding-left:18px}.sources a{color:var(--gold)}

@media(max-width:900px){
 .timeline,.n64,.tools,.faq{grid-template-columns:1fr}
 .n64{padding:22px;gap:20px}
 .more-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:600px){
 .stat-cards{grid-template-columns:1fr}
 .stat{flex-direction:row;flex-wrap:wrap;align-items:baseline;gap:4px 10px;padding:14px}
 .stat b{font-size:28px}.stat small{flex-basis:100%;margin:0}
 .chapter{grid-template-columns:1fr}
 .ch-num{text-align:left;padding:8px 16px;border-right:0;border-bottom:1px solid var(--line);font-size:16px}
 .ch-body{padding:14px 16px 12px}
 .ch-facts{grid-template-columns:1fr}
 .walk-tools,#chapter-search{width:100%}
 .more-grid{grid-template-columns:1fr}
 .hero-actions{flex-direction:column}.hero-actions .btn{width:100%}
 .walk-progress{top:84px}
 .sources ul{columns:1}
}

/* collapse finished chapters */
.ch-reward{display:none;font-size:13px;color:var(--green)}
.ch-reward:before{content:"\2713  "}
.ch-more{display:grid;grid-template-rows:1fr;transition:grid-template-rows .22s ease,opacity .22s ease}
.ch-more>div{overflow:hidden;min-height:0}
.expand{display:none;margin-left:auto;background:none;border:0;color:var(--muted);cursor:pointer;font-size:13px;padding:0}
.expand:hover{color:var(--gold)}
.chapter.is-done:not(.is-open) .ch-more{grid-template-rows:0fr;opacity:0}
.chapter.is-done:not(.is-open) .ch-body{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;column-gap:16px;padding:10px 18px}
.chapter.is-done:not(.is-open) .ch-head{grid-column:1;grid-row:1;min-width:0}
.chapter.is-done:not(.is-open) .ch-more{grid-column:1/-1;grid-row:2}
.chapter.is-done:not(.is-open) .ch-foot{grid-column:2;grid-row:1}
.chapter.is-done:not(.is-open) .ch-head h3{font-size:18px}
.chapter.is-done:not(.is-open) .ch-head .tag{display:none}
.chapter.is-done:not(.is-open) .ch-foot{margin:0;padding:0;border:0}
.chapter.is-done:not(.is-open) .hint,.chapter.is-done:not(.is-open) .go{display:none}
.chapter.is-done:not(.is-open) .ch-num{padding-top:12px;font-size:18px}
.chapter.is-done .ch-reward,.chapter.is-done .expand{display:inline}
.chapter.is-done.is-open .go{margin-left:0}
@media(max-width:600px){.chapter.is-done:not(.is-open){grid-template-columns:40px 1fr}.chapter.is-done:not(.is-open) .ch-num{padding:12px 0 0;text-align:center;border-bottom:0;border-right:1px solid var(--line);font-size:15px}.chapter.is-done:not(.is-open) .ch-body{padding:10px 12px;column-gap:10px}.chapter.is-done:not(.is-open) .ch-head h3{font-size:16px}.chapter.is-done:not(.is-open) .done{font-size:0;gap:0}}
@media(prefers-reduced-motion:reduce){.ch-more{transition:none}}

.tool-links{display:grid;gap:8px;margin-top:16px}.tool-links a{display:block;padding:12px 14px;border:1px solid var(--line2);border-radius:9px;background:var(--bg)}.tool-links a:hover{border-color:var(--gold)}.tool-links b{display:block;color:var(--gold);font-weight:600}.tool-links span{font-size:13px;color:var(--muted)}

/* era banners */
.era-banner{display:flex;align-items:flex-end;min-height:120px;margin:32px 0 12px;padding:16px 20px;border-radius:12px;border:1px solid var(--line);background-image:linear-gradient(90deg,rgba(7,23,22,.85),rgba(7,23,22,.2) 70%),linear-gradient(0deg,rgba(7,23,22,.55),transparent 60%),var(--banner);background-size:cover;background-position:center;font-size:14px}
.era-banner span{color:#cfd9d1}
.era-banner[hidden]{display:none}
@media(max-width:600px){.era-banner{min-height:96px}}
.chapter.is-done:not(.is-open) .ch-route{display:none}

/* ---------- compact phone layout ---------- */
@media(max-width:600px){
 /* hero */
 .hero{padding:24px 0 20px}
 .hero .eyebrow{font-size:10px;margin-bottom:8px}
 .hero h1{font-size:32px;margin-bottom:12px}
 .lede{font-size:15px;line-height:1.55}
 .hero-actions{flex-direction:row;gap:8px;margin-top:18px}
 .hero-actions .btn{flex:1;width:auto;height:44px;padding:0 8px;font-size:14px;white-space:nowrap}
 .hero-progress{margin-top:12px}
 /* chapter strip: one swipeable row */
 .timeline{display:flex;gap:0;width:auto;overflow-x:auto;scrollbar-width:none;margin:0;padding:0 20px}
 .timeline::-webkit-scrollbar{display:none}
 .tl-group{display:flex;align-items:center;gap:8px;padding:0;margin-right:10px;background:none;border:0;flex:none}
 .tl-label{margin:0;font-size:10px;white-space:nowrap}
 .tl-chips{flex-wrap:nowrap}
 .chip{font-size:12px;padding:3px 9px 3px 4px}
 /* N64 band */
 .n64{margin-top:28px;padding:16px;gap:12px}
 .n64 h2{font-size:20px;margin:0}
 .n64-head p.muted{display:none}
 .n64 .eyebrow{margin-bottom:4px}
 .stat-cards{grid-template-columns:repeat(3,1fr);gap:8px}
 .stat{flex-direction:column;align-items:flex-start;padding:10px;gap:0}
 .stat b{font-size:24px}.stat span{font-size:12px;margin-top:2px;line-height:1.3}
 .stat small{display:none}
 /* walkthrough */
 .walk{margin-top:36px}
 .walk h2{font-size:24px}
 .walk-head{gap:12px}
 #chapter-count{display:none}
 .walk-progress{margin:12px 0 0}
 .era-banner{min-height:64px;margin:20px 0 8px;padding:10px 14px;font-size:12px}
 .chapters{gap:8px}
 .chapter{grid-template-columns:40px 1fr}
 .ch-num{text-align:center;padding:14px 0 0;border-right:1px solid var(--line);border-bottom:0;font-size:15px}
 .ch-body{padding:12px 14px 10px}
 .ch-head{gap:6px}.ch-head h3{font-size:19px}
 .ch-head .tag{font-size:10px;padding:0 6px}
 .ch-route{font-size:14px;margin:6px 0 0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
 .chapter.is-open .ch-route{-webkit-line-clamp:unset;display:block}
 .chapter:not(.is-open) .ch-more{grid-template-rows:0fr;opacity:0}
 .chapter.is-open .ch-more>div{padding-top:12px}
 .ch-facts{grid-template-columns:1fr;margin-bottom:10px}
 .ch-facts div{display:flex;gap:10px;align-items:baseline;padding:7px 10px}
 .ch-facts dt{flex:none;width:52px}
 .ch-foot{margin-top:10px;padding-top:8px;gap:12px;font-size:13px}
 .expand{display:inline;margin-left:auto}
 .chapter:not(.is-open) .hint,.chapter:not(.is-open) .go{display:none}
 .chapter.is-open .go{margin-left:0}
 /* collapsed-when-done rows stay as before */
 .chapter.is-done:not(.is-open) .ch-body{padding:10px 12px}
 /* tools */
 .tools{margin-top:36px;gap:12px}
 .panel{padding:16px}
 .panel h2,.tools h2{font-size:22px;margin-bottom:10px}
 .next-result h3{font-size:18px}.next-result p{font-size:14px}
 .coll{padding:10px 0}
 .tool-links{grid-template-columns:1fr 1fr;gap:8px}
 .tool-links a{padding:10px}.tool-links span{display:none}
 /* more guides */
 .more{margin-top:36px}
 .more h2,.faq h2{font-size:22px}
 .more-grid{grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}
 .more-grid a{padding:12px}.more-grid b{font-size:15px}.more-grid span{display:none}
 /* faq */
 .faq{margin-top:36px;gap:8px}
 .faq .eyebrow{display:none}
 .faq-list summary{font-size:15px}
}