/* ============================================================
   SNAKE PUZZLE — "Grid Trace" design system
   A puzzle board rendered as a design language: graph-paper grid,
   coordinate-style HUD type, cut-corner puzzle-piece chrome, and a
   literal snake trail that threads the page like a solved path.
   ============================================================ */

:root{
  --bg:#0a0d10;
  --bg-deep:#070909;
  --grid-line:rgba(148,255,180,.05);
  --grid-line-strong:rgba(148,255,180,.09);
  --panel:#10151a;
  --panel-2:#141b21;
  --border:rgba(237,244,239,.1);
  --border-soft:rgba(237,244,239,.06);
  --text:#edf4ef;
  --muted:#8ea299;
  --accent:#6bff8f;
  --accent-dim:#2f5c3d;
  --accent-ink:#04140b;
  --accent-2:#ff7a52;
  --accent-2-dim:#5c3123;
  --font-display:'Space Grotesk',system-ui,Arial,sans-serif;
  --font-body:'Inter',system-ui,Arial,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,Menlo,monospace;
  --cut:14px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--text);font:16px/1.65 var(--font-body);
  background:
    linear-gradient(var(--grid-line) 1px,transparent 1px) 0 0/42px 42px,
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px) 0 0/42px 42px,
    radial-gradient(ellipse 900px 500px at 50% -10%,#123521 0%,transparent 60%),
    var(--bg);
  background-attachment:fixed;
}
a{color:inherit}
.container{width:min(1160px,calc(100% - 32px));margin:auto}

/* ---------- header ---------- */
.header{position:sticky;top:0;z-index:20;background:#0a0d10ee;backdrop-filter:blur(8px);border-bottom:1px solid var(--border-soft)}
.header-in{height:74px;display:flex;justify-content:space-between;align-items:center}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--font-display);font-weight:700;font-size:18px;letter-spacing:-.2px}
.logo-mark{width:38px;height:38px;background:var(--accent);display:grid;place-items:center;clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);box-shadow:0 0 22px #6bff8f4d}
.logo-mark:after{content:'S';font-family:var(--font-mono);font-weight:700;color:var(--accent-ink);font-size:15px}
.nav{display:flex;gap:4px;align-items:center}
.nav a{text-decoration:none;padding:9px 12px;border-radius:8px;color:#c4d3c9;font-size:14px;font-weight:500;transition:background .15s,color .15s}
.nav a:hover{background:var(--border-soft);color:var(--text)}
.menu{display:none;background:none;border:1px solid var(--border);color:var(--text);padding:8px 12px;font-family:var(--font-mono);font-size:12px;letter-spacing:.05em}

/* ---------- buttons — cut-corner "puzzle piece" chrome ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:13px 20px;
  text-decoration:none;font-weight:700;font-family:var(--font-body);font-size:14.5px;
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
  transition:transform .15s ease,box-shadow .15s ease,filter .15s ease;
}
.btn:hover{transform:translateY(-2px)}
.primary{background:var(--accent);color:var(--accent-ink);box-shadow:0 0 0 1px #6bff8f33,0 12px 30px -10px #6bff8f66}
.primary:hover{filter:brightness(1.08);box-shadow:0 0 0 1px #6bff8f55,0 16px 34px -8px #6bff8f88}
.secondary{background:var(--panel-2);border:1px solid var(--border);color:var(--text)}
.secondary:hover{border-color:#6bff8f55;background:#141c17}

/* ---------- eyebrow / HUD tags ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;color:var(--accent);
  background:#6bff8f0f;border:1px solid #6bff8f3d;
  padding:6px 12px;font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.09em;text-transform:uppercase;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
}
.eyebrow:before{content:'▸';font-size:11px}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:100px 0 70px;border-bottom:1px solid var(--border-soft)}
.hero3d-canvas{position:absolute;inset:0;width:100%;height:100%;display:block;z-index:0;opacity:.65;pointer-events:none;mask-image:radial-gradient(ellipse 80% 80% at 60% 40%,#000 40%,transparent 85%)}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.15fr .85fr;gap:55px;align-items:center}
.hero h1{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(46px,7vw,78px);line-height:.96;letter-spacing:-2.5px;margin:20px 0 14px;
}
.hero h1 span{color:var(--accent);position:relative;white-space:nowrap}
.hero h1 span:after{content:'';position:absolute;left:0;right:-6px;bottom:6px;height:.28em;background:#6bff8f22;z-index:-1}
.hero h2{font-family:var(--font-mono);font-size:15px;font-weight:500;color:var(--muted);letter-spacing:.02em;text-transform:none;margin:0 0 16px}
.lead{font-size:17.5px;color:#aebeb4;max-width:600px;margin:0 0 8px}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0}
.pills{display:flex;gap:8px;flex-wrap:wrap;list-style:none;padding:0;margin-top:22px}
.pills li{
  border:1px solid var(--border);color:#a9bcae;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.03em;
  padding:7px 11px;background:#ffffff05;
}

/* ---------- phone / game board mockup ---------- */
.phone-wrap{perspective:1400px}
.phone{
  max-width:370px;margin:auto;padding:12px;background:#0d1410;border:1px solid var(--border);
  box-shadow:0 40px 80px -20px #000a,0 0 0 1px #6bff8f14,inset 0 0 0 1px #ffffff08;
  transform-style:preserve-3d;will-change:transform;animation:floatPhone 7s ease-in-out infinite;
  clip-path:polygon(22px 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%,0 22px);
}
@keyframes floatPhone{0%,100%{transform:translateY(0) rotateY(-7deg) rotateX(3deg)}50%{transform:translateY(-14px) rotateY(7deg) rotateX(-3deg)}}
@media(prefers-reduced-motion:reduce){.phone{animation:none;transform:none}}
.screen{height:560px;background:#070a08;padding:16px;color:var(--text);position:relative;overflow:hidden}
.gamebar{display:flex;justify-content:space-between;align-items:center;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--accent);text-transform:uppercase;padding-bottom:12px;border-bottom:1px solid var(--border-soft)}
.board{
  height:410px;margin-top:16px;position:relative;
  background:
    linear-gradient(var(--grid-line-strong) 1px,transparent 1px) 0 0/13.5% 12.5%,
    linear-gradient(90deg,var(--grid-line-strong) 1px,transparent 1px) 0 0/13.5% 12.5%,
    #0a0f0b;
  display:grid;place-items:center;
}
.board-svg{width:100%;height:100%}
.board-node{fill:#1c2a20;stroke:var(--border);stroke-width:1}
.board-node.on{fill:var(--accent);filter:drop-shadow(0 0 6px #6bff8f)}
.board-node.head{fill:#eafff0}
.board-path{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;stroke-linejoin:round;filter:drop-shadow(0 0 5px #6bff8f99);stroke-dasharray:6 6;animation:dash 1.4s linear infinite}
@keyframes dash{to{stroke-dashoffset:-24}}
.snake{font-size:110px}

/* ---------- sections ---------- */
.section{padding:80px 0;border-top:1px solid var(--border-soft)}
.section h2{font-family:var(--font-display);font-weight:700;font-size:clamp(30px,4vw,42px);line-height:1.08;letter-spacing:-1px;margin:10px 0 12px}
.muted{color:var(--muted)}

/* ---------- how it works: signature snake-trail ---------- */
.steps-wrap{position:relative;margin-top:26px;padding-top:30px}
.trail-svg{position:absolute;top:0;left:0;width:100%;height:30px;overflow:visible;pointer-events:none;z-index:0}
.trail-path{fill:none;stroke:var(--accent);stroke-width:2.5;stroke-linecap:round;opacity:.85;filter:drop-shadow(0 0 6px #6bff8f88)}
.steps{position:relative;z-index:1;display:grid;grid-template-columns:repeat(5,1fr);gap:15px}
.card{
  background:var(--panel);border:1px solid var(--border-soft);padding:24px 20px;position:relative;
  transition:border-color .2s,transform .2s,background .2s;
}
.card:before,.card:after{content:'';position:absolute;width:14px;height:14px;border:1.5px solid transparent;transition:border-color .2s}
.card:before{top:-1px;left:-1px;border-top-color:var(--accent);border-left-color:var(--accent);opacity:0}
.card:after{bottom:-1px;right:-1px;border-bottom-color:var(--accent);border-right-color:var(--accent);opacity:0}
.card:hover{transform:translateY(-4px);background:var(--panel-2);border-color:var(--border)}
.card:hover:before,.card:hover:after{opacity:1}
.card h3{margin:8px 0 7px;font-family:var(--font-display);font-weight:700;font-size:19px}
.num{
  display:inline-block;color:var(--accent-ink);background:var(--accent);
  font-family:var(--font-mono);font-weight:700;font-size:11px;letter-spacing:.04em;
  padding:3px 8px;
}
.icon{font-size:28px}

/* ---------- grid (why play) ---------- */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}

/* ---------- legal / long-form ---------- */
.legal{max-width:820px;padding:80px 0}
.legal h1{font-family:var(--font-display);font-weight:700;font-size:clamp(36px,5vw,52px);line-height:1.04;letter-spacing:-1.5px}
.legal h2{margin-top:38px;font-family:var(--font-display);font-weight:700;font-size:22px}
.legal p,.legal li{color:#c1cec3}
.notice{
  padding:18px 20px;border:1px solid #6bff8f3d;background:#6bff8f0a;
  clip-path:polygon(16px 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%,0 16px);
}

/* ---------- screenshots ---------- */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.shot{height:330px;border:1px solid var(--border);background:linear-gradient(160deg,#12251a,#0a140e);display:grid;place-items:center;font-size:80px;position:relative}
.shot:after{content:'';position:absolute;inset:0;background:linear-gradient(var(--grid-line-strong) 1px,transparent 1px) 0 0/20% 20%,linear-gradient(90deg,var(--grid-line-strong) 1px,transparent 1px) 0 0/20% 20%}

/* ---------- faq ---------- */
.faq{display:grid;gap:10px}
.faq details{border:1px solid var(--border);background:var(--panel);padding:16px 18px}
.faq summary{cursor:pointer;font-weight:700;font-family:var(--font-display);font-size:15.5px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary:before{content:'+ ';color:var(--accent);font-family:var(--font-mono)}
.faq details[open] summary:before{content:'– '}
.faq p{margin-top:10px}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--border-soft);padding:50px 0 22px;background:var(--bg-deep)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.footer a{display:block;text-decoration:none;color:var(--muted);margin:7px 0;font-size:14.5px;transition:color .15s}
.footer a:hover{color:var(--accent)}
.copyright{border-top:1px solid var(--border-soft);margin-top:32px;padding-top:18px;color:#5c6c62;font-size:12.5px;font-family:var(--font-mono);letter-spacing:.03em}

/* ---------- cta ---------- */
.cta{text-align:center;padding:70px 0}
.cta-box{
  padding:48px 30px;border:1px solid #6bff8f3d;background:radial-gradient(ellipse at 50% 0%,#6bff8f14,transparent 70%),var(--panel);
  clip-path:polygon(26px 0,100% 0,100% calc(100% - 26px),calc(100% - 26px) 100%,0 100%,0 26px);
}
.cta h2{font-family:var(--font-display);font-weight:700;font-size:clamp(28px,4vw,40px);letter-spacing:-1px}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .hero-grid,.footer-grid{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr}
  .trail-svg{display:none}
  .nav{display:none}
  .menu{display:block}
}
@media(max-width:600px){
  .container{width:calc(100% - 24px)}
  .grid,.steps,.gallery{grid-template-columns:1fr}
  .screen{height:480px}
  .board{height:320px}
  .hero h1{font-size:46px;letter-spacing:-1.5px}
  .actions .btn{width:100%;text-align:center;justify-content:center}
  .legal h1{font-size:36px}
}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.board-path{animation:none}}