/* Tripearlsoft — site.css
   White, editorial, instrument-like. One accent (amber), one ink (indigo).
   Every page has a "playground" in the hero: an interactive piece tied to the page topic. */

@font-face{font-family:"Bricolage";src:url(../fonts/bricolage.woff2) format("woff2");font-weight:200 800;font-display:swap}
@font-face{font-family:"Figtree";src:url(../fonts/figtree.woff2) format("woff2");font-weight:300 900;font-display:swap}
@font-face{font-family:"JBMono";src:url(../fonts/mono.woff2) format("woff2");font-weight:100 800;font-display:swap}

:root{
  --bg:#fff;--paper:#f7f6f2;--paper-2:#efede7;
  --ink:#121126;--ink-2:#3f3d55;--mute:#7f7c90;--line:#e8e6ee;--line-2:#d9d6e2;
  --indigo:#1f1a6b;--indigo-2:#2f28a0;--indigo-soft:#eeedf8;
  --amber:#f28c1b;--amber-ink:#b0560a;--amber-soft:#fdf1e4;
  --green:#1d8a5b;--red:#c8432f;
  --display:"Bricolage",ui-sans-serif,system-ui,sans-serif;
  --body:"Figtree",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JBMono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --max:1320px;--gut:clamp(20px,4vw,48px);
  --r:14px;--r-lg:22px;
  --ease:cubic-bezier(.2,.75,.15,1);
  --shadow:0 1px 0 rgba(18,17,38,.04),0 12px 32px -18px rgba(18,17,38,.22);
}
*,*:before,*:after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.6 var(--body);-webkit-font-smoothing:antialiased;overflow-x:clip}
img,svg,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:0;padding:0}
::selection{background:var(--ink);color:#fff}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px;border-radius:4px}
h1,h2,h3,h4{font-family:var(--display);font-weight:560;letter-spacing:-.025em;margin:0;line-height:1.04;font-variation-settings:"wdth" 100}
h1{font-size:clamp(44px,6.6vw,104px);letter-spacing:-.045em;line-height:.96}
h2{font-size:clamp(34px,4.2vw,64px);letter-spacing:-.038em}
h3{font-size:clamp(21px,1.7vw,26px);letter-spacing:-.02em;line-height:1.18}
p{margin:0 0 1em}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.02em;font-weight:450}
.muted{color:var(--mute)}
.wrap{width:min(var(--max),100% - var(--gut)*2);margin-inline:auto}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:12px;top:-60px;background:var(--ink);color:#fff;padding:10px 14px;border-radius:8px;z-index:100}
.skip:focus{top:12px}
mark{background:linear-gradient(transparent 62%,var(--amber-soft) 62%);color:inherit;padding:0 .04em}
em.ink{font-style:normal;color:var(--indigo)}
.u{background:linear-gradient(var(--amber),var(--amber)) 0 92%/100% .08em no-repeat}

/* ---------- Header ---------- */
.hdr{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(1.8) blur(16px);-webkit-backdrop-filter:saturate(1.8) blur(16px);border-bottom:1px solid transparent;transition:border-color .3s,background .3s}
.scrolled .hdr{border-bottom-color:var(--line)}
.hdr .wrap{display:flex;align-items:center;gap:28px;height:76px}
.logo img{height:38px;width:auto}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{font-size:15px;font-weight:500;color:var(--ink-2);padding:8px 13px;border-radius:999px;position:relative}
.nav a:hover{color:var(--ink);background:var(--paper)}
.nav a[aria-current=page]{color:var(--ink)}
.nav a[aria-current=page]:after{content:"";position:absolute;left:50%;bottom:2px;width:5px;height:5px;margin-left:-2.5px;border-radius:50%;background:var(--amber)}
.hdr .btn{margin-left:8px}
.burger{display:none;margin-left:auto;width:46px;height:46px;border-radius:50%;border:1px solid var(--line-2);position:relative}
.burger span,.burger:before,.burger:after{content:"";position:absolute;left:14px;right:14px;height:1.6px;background:var(--ink);transition:transform .35s var(--ease),opacity .2s}
.burger:before{top:17px}.burger span{top:22px}.burger:after{top:27px}
.menu-open .burger:before{transform:translateY(5px) rotate(45deg)}
.menu-open .burger span{opacity:0}
.menu-open .burger:after{transform:translateY(-5px) rotate(-45deg)}
.progress{position:fixed;top:0;left:0;height:2px;width:100%;background:var(--amber);transform-origin:0 50%;transform:scaleX(var(--p,0));z-index:60}

/* ---------- Buttons ---------- */
.btn{--bg:var(--ink);--fg:#fff;display:inline-flex;align-items:center;gap:12px;background:var(--bg);color:var(--fg);border-radius:999px;padding:14px 22px;font-weight:600;font-size:15px;line-height:1;white-space:nowrap;transition:transform .35s var(--ease),background .25s,box-shadow .3s;will-change:transform}
.btn:hover{--bg:var(--indigo)}
.btn i{font-style:normal;display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:var(--amber);color:var(--ink);font-size:12px;transition:transform .4s var(--ease)}
.btn:hover i{transform:rotate(-45deg)}
.btn.ghost{--bg:transparent;--fg:var(--ink);box-shadow:inset 0 0 0 1px var(--line-2)}
.btn.ghost:hover{--bg:var(--paper)}
.btn.sm{padding:11px 16px;font-size:14px}
.link{font-weight:600;display:inline-flex;gap:8px;align-items:center;border-bottom:1px solid var(--line-2);padding-bottom:3px;transition:border-color .2s,gap .3s var(--ease)}
.link:hover{border-color:var(--ink);gap:12px}

/* ---------- Hero + playground frame ---------- */
.hero{padding:56px 0 72px;position:relative}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);gap:clamp(28px,4vw,64px);align-items:center}
.kicker{display:flex;align-items:center;gap:10px;margin-bottom:26px;color:var(--ink-2)}
.kicker b{display:inline-grid;place-items:center;min-width:28px;height:22px;padding:0 6px;border-radius:6px;background:var(--ink);color:#fff;font:600 11px var(--mono)}
.hero h1{margin-bottom:26px}
.lead{font-size:clamp(17px,1.35vw,20px);color:var(--ink-2);max-width:34em;margin-bottom:32px;line-height:1.55}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.hero-meta{display:flex;gap:28px;margin-top:44px;padding-top:22px;border-top:1px solid var(--line);flex-wrap:wrap}
.hero-meta div{min-width:110px}
.hero-meta strong{display:block;font:560 28px/1 var(--display);letter-spacing:-.03em;margin-bottom:6px}
.hero-meta span{font-size:13px;color:var(--mute)}

.play{position:relative;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow);isolation:isolate}
.play-bar{display:flex;align-items:center;gap:10px;padding:12px 14px 12px 16px;border-bottom:1px solid var(--line);background:#fff}
.play-bar .dot{width:8px;height:8px;border-radius:50%;background:var(--amber);box-shadow:0 0 0 0 rgba(242,140,27,.5);animation:ping 2.2s infinite}
.play-bar .mono{color:var(--ink-2)}
.play-bar .hint{margin-left:auto;color:var(--mute)}
.play-bar button{font:500 12px var(--mono);border:1px solid var(--line-2);border-radius:999px;padding:6px 11px;background:#fff}
.play-bar button:hover{background:var(--paper)}
.play-body{position:relative}
.play-foot{display:flex;gap:8px;flex-wrap:wrap;padding:12px 14px;border-top:1px solid var(--line);background:#fff}
@keyframes ping{0%{box-shadow:0 0 0 0 rgba(242,140,27,.55)}70%,100%{box-shadow:0 0 0 9px rgba(242,140,27,0)}}

/* chips */
.chip{display:inline-flex;align-items:center;gap:8px;padding:9px 14px;border-radius:999px;border:1px solid var(--line-2);background:#fff;font-size:14px;font-weight:500;color:var(--ink-2);transition:all .25s var(--ease);user-select:none}
.chip:hover{border-color:var(--ink);color:var(--ink)}
.chip[aria-pressed=true],.chip.on{background:var(--ink);border-color:var(--ink);color:#fff}
.chip .k{font:500 11px var(--mono);opacity:.6}

/* ---------- Sections ---------- */
.sec{padding:clamp(72px,9vw,136px) 0}
.sec.paper{background:var(--paper)}
.sec.ink{background:var(--ink);color:#fff}
.sec.ink p{color:#c9c7d8}
.sec-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.62fr);gap:40px;align-items:end;margin-bottom:clamp(36px,5vw,64px)}
.sec-head .idx{display:block;margin-bottom:20px;color:var(--mute)}
.sec.ink .sec-head .idx{color:#9a97b0}
.sec-head p{color:var(--ink-2);margin:0;max-width:30em}
.rule{height:1px;background:var(--line);border:0;margin:0}

/* index list — numbered rows that reveal a preview */
.rows{border-top:1px solid var(--line)}
.row{display:grid;grid-template-columns:70px minmax(0,1.1fr) minmax(0,1fr) 40px;gap:24px;align-items:center;padding:28px 0;border-bottom:1px solid var(--line);position:relative;transition:padding .45s var(--ease)}
.row .n{color:var(--mute)}
.row h3{font-size:clamp(22px,2.3vw,34px);letter-spacing:-.03em;transition:transform .45s var(--ease),color .25s}
.row p{margin:0;color:var(--ink-2);font-size:15px}
.row .go{width:40px;height:40px;border-radius:50%;border:1px solid var(--line-2);display:grid;place-items:center;transition:all .35s var(--ease)}
.row:hover{padding-left:12px}
.row:hover h3{color:var(--indigo)}
.row:hover .go{background:var(--amber);border-color:var(--amber);transform:rotate(-45deg)}

/* card grid */
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px;position:relative;overflow:hidden;transition:transform .45s var(--ease),box-shadow .45s var(--ease),border-color .3s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--line-2)}
.card .mono{color:var(--mute);display:block;margin-bottom:28px}
.card h3{margin-bottom:10px}
.card p{color:var(--ink-2);font-size:15px;margin:0}
.card.spot:before{content:"";position:absolute;inset:0;background:radial-gradient(360px circle at var(--mx,50%) var(--my,50%),rgba(242,140,27,.09),transparent 60%);opacity:0;transition:opacity .3s;pointer-events:none}
.card.spot:hover:before{opacity:1}

/* quote / statement */
.statement{font:500 clamp(28px,3.6vw,54px)/1.12 var(--display);letter-spacing:-.035em;max-width:20em}
.statement .dim{color:#b4b1c3}
.sec.ink .statement .dim{color:#5f5c78}

/* process */
.steps{display:grid;grid-template-columns:repeat(4,1fr);counter-reset:s;border-top:1px solid var(--line)}
.steps>div{padding:30px 26px 10px 0;position:relative}
.steps>div+div{padding-left:26px;border-left:1px solid var(--line)}
.steps .mono{color:var(--amber-ink);display:block;margin-bottom:46px}
.steps h3{margin-bottom:10px}
.steps p{font-size:15px;color:var(--ink-2)}

/* marquee */
.marq{overflow:hidden;border-block:1px solid var(--line);padding:22px 0;-webkit-mask:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);mask:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.marq>div{display:flex;gap:48px;width:max-content;animation:marq 42s linear infinite;font:500 clamp(22px,2.4vw,34px) var(--display);letter-spacing:-.03em;color:var(--ink-2)}
.marq>div span:nth-child(even){color:var(--amber)}
.marq:hover>div{animation-play-state:paused}
@keyframes marq{to{transform:translateX(-50%)}}

/* FAQ */
.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;gap:20px;padding:22px 0;font:540 clamp(19px,1.6vw,23px)/1.3 var(--display);letter-spacing:-.02em}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";font:300 26px/1 var(--body);transition:transform .35s var(--ease);color:var(--mute)}
.faq details[open] summary:after{transform:rotate(45deg)}
.faq details p{color:var(--ink-2);max-width:46em;padding-bottom:16px}

/* next page teaser (retention) */
.next{display:block;padding:clamp(64px,8vw,120px) 0;border-top:1px solid var(--line);position:relative;overflow:hidden}
.next .mono{color:var(--mute)}
.next .t{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-top:16px}
.next h2{font-size:clamp(48px,9vw,148px);letter-spacing:-.055em;transition:transform .6s var(--ease)}
.next .arr{flex:none;width:clamp(64px,8vw,120px);aspect-ratio:1;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:clamp(24px,3vw,42px);transition:transform .6s var(--ease),background .3s}
.next:hover h2{transform:translateX(18px)}
.next:hover .arr{transform:rotate(-45deg);background:var(--amber);color:var(--ink)}
.next .sub{color:var(--ink-2);margin-top:10px;max-width:36em}

/* ---------- Footer ---------- */
.ftr{border-top:1px solid var(--line);padding:72px 0 28px;background:var(--bg)}
.ftr-top{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:40px;padding-bottom:56px}
.ftr .big{font:540 clamp(28px,3vw,42px)/1.1 var(--display);letter-spacing:-.035em;margin:18px 0 22px;max-width:12em}
.ftr .mail{font:500 18px var(--body);border-bottom:1px solid var(--ink);padding-bottom:3px}
.ftr h4{font:500 12px var(--mono);color:var(--mute);margin-bottom:18px;letter-spacing:.02em}
.ftr ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.ftr li a{color:var(--ink-2);font-size:15px}
.ftr li a:hover{color:var(--ink)}
.ftr-bot{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;padding-top:24px;border-top:1px solid var(--line);font-size:13px;color:var(--mute)}
.ftr-bot nav{display:flex;gap:18px;flex-wrap:wrap}
.social{display:flex;gap:8px;margin-top:26px}
.social a{width:38px;height:38px;border-radius:50%;border:1px solid var(--line-2);display:grid;place-items:center;font:600 11px var(--mono);color:var(--ink-2)}
.social a:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.ratings{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.ratings a{display:flex;gap:10px;align-items:baseline;border:1px solid var(--line);border-radius:12px;padding:10px 14px;font-size:13px;color:var(--ink-2)}
.ratings b{font:560 20px var(--display);color:var(--ink)}

/* ---------- Reveal ---------- */
.js [data-r]{opacity:0;transform:translateY(26px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.js [data-r].in{opacity:1;transform:none}
.js .split .w{display:inline-block;overflow:hidden;vertical-align:top;padding-bottom:.08em;margin-bottom:-.08em}
.js .split .w>span{display:inline-block;transform:translateY(105%);transition:transform 1s var(--ease)}
.js .split.in .w>span{transform:none}

/* ---------- Responsive ---------- */
@media(max-width:1080px){
  .nav,.hdr .btn{display:none}
  .burger{display:block}
  .menu-open .nav{display:flex;position:fixed;inset:76px 0 0;background:#fff;flex-direction:column;padding:24px var(--gut);gap:0;overflow:auto}
  .menu-open .nav a{font:540 34px/1.15 var(--display);letter-spacing:-.03em;padding:14px 0;border-bottom:1px solid var(--line);border-radius:0;background:none}
  .menu-open .nav a[aria-current=page]:after{left:auto;right:0;top:50%;bottom:auto;width:10px;height:10px}
  .menu-open{overflow:hidden}
  .hero-grid{grid-template-columns:1fr}
  .sec-head{grid-template-columns:1fr;gap:18px}
  .g4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ftr-top{grid-template-columns:1fr 1fr}
  .ftr-top>div:first-child{grid-column:1/-1}
}
@media(max-width:720px){
  body{font-size:16px}
  .hdr .wrap{height:66px}
  .menu-open .nav{inset:66px 0 0}
  .logo img{height:32px}
  .hero{padding:28px 0 56px}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .row{grid-template-columns:44px 1fr 32px;gap:14px;padding:22px 0}
  .row p{grid-column:2/3}
  .row .go{grid-row:1;grid-column:3;width:32px;height:32px}
  .steps{grid-template-columns:1fr 1fr}
  .steps>div{padding:24px 14px 8px 0}
  .steps>div+div{padding-left:14px}
  .steps>div:nth-child(3){padding-left:0;border-left:0}
  .steps>div:nth-child(n+3){border-top:1px solid var(--line)}
  .steps .mono{margin-bottom:22px}
  .hero-meta{gap:18px}
  .next .t{align-items:flex-end}
  .play-bar .hint{display:none}
}
@media(prefers-reduced-motion:reduce){
  *,*:before,*:after{animation-duration:.001s!important;animation-iteration-count:1!important;transition-duration:.001s!important;scroll-behavior:auto!important}
  .js [data-r],.js .split .w>span{opacity:1;transform:none}
}
.m-only{display:none}.menu-open .nav .m-only{display:block}
.logo img{height:44px}
.play-bar button{white-space:nowrap}
@media(max-width:720px){
  .play-bar .mono{font-size:11px}
  .play-foot{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
  .play-foot::-webkit-scrollbar{display:none}
  .play-foot .chip{flex:none}
  .hero-meta>div{min-width:0;flex:1 1 40%}
  .logo img{height:36px}
}

/* ---------- Shared game frame ---------- */
.game{position:relative;background:var(--paper);min-height:440px;overflow:hidden;user-select:none;-webkit-user-select:none}
.hud{display:flex;gap:18px;align-items:center;padding:10px 16px;border-bottom:1px solid var(--line);background:#fff;font:500 12px var(--mono);color:var(--ink-2)}
.hud b{font:600 18px var(--display);color:var(--ink);letter-spacing:-.02em;margin-left:6px;font-variant-numeric:tabular-nums}
.hud .tbar{flex:1;height:4px;border-radius:4px;background:var(--line);overflow:hidden}
.hud .tbar i{display:block;height:100%;width:100%;background:var(--ink);transform-origin:left;transition:background .3s}
.hud .tbar i.low{background:var(--red)}
.gscreen{position:absolute;inset:0;z-index:20;display:grid;place-items:center;text-align:center;padding:28px;background:rgba(247,246,242,.9);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);transition:opacity .35s,visibility .35s}
.gscreen[hidden]{display:grid!important;opacity:0;visibility:hidden;pointer-events:none}
.gscreen h3{font-size:clamp(26px,2.6vw,36px);letter-spacing:-.035em;margin:10px 0 10px}
.gscreen p{color:var(--ink-2);max-width:26em;margin:0 auto 20px;font-size:15px}
.gscreen .mono{color:var(--amber-ink)}
.gscreen .big{font:600 clamp(48px,6vw,76px)/1 var(--display);letter-spacing:-.05em;display:block;margin:6px 0}
.gscreen .row-b{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.gscreen .best{font:500 12px var(--mono);color:var(--mute);margin-top:14px}
.pop{position:absolute;z-index:15;pointer-events:none;font:700 15px var(--display);color:var(--green);animation:popUp .9s var(--ease) forwards}
.pop.bad{color:var(--red)}
@keyframes popUp{from{opacity:1;transform:translate(-50%,0)}to{opacity:0;transform:translate(-50%,-34px)}}
.shake-x{animation:shx .35s}
@keyframes shx{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}