/* ===== 2048 NEON — shared styles ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --cyan:#00E5FF; --pink:#FF007F; --magenta:#DF00FF; --yellow:#FFD500;
  --bg:#0A0A0C; --surface:#161618; --cell:#13151A; --red:#FF4444;
  --text:#ECECF1; --muted:#8C8C97; --line:rgba(255,255,255,.08);
  --primary:var(--cyan); --c2:var(--pink); --c3:var(--magenta); --c4:var(--yellow);
  --radius:20px; --maxw:1140px;
  --font-display:'Orbitron',system-ui,sans-serif;
  --font-body:'Rajdhani','Inter',system-ui,sans-serif;
  --ease:cubic-bezier(.22,1,.36,1);
}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-body); background:var(--bg); color:var(--text);
  line-height:1.65; font-size:18px; letter-spacing:.3px;
  min-height:100vh; overflow-x:hidden; position:relative;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:var(--primary);color:#000}

/* ---------- background fx ---------- */
.bg-fx{position:fixed;inset:0;z-index:-2;overflow:hidden;pointer-events:none}
.bg-fx::before{
  content:'';position:absolute;inset:-25%;
  background:
    radial-gradient(38vw 38vw at 14% 8%, color-mix(in srgb,var(--primary) 24%,transparent), transparent 60%),
    radial-gradient(44vw 44vw at 86% 16%, color-mix(in srgb,var(--c2) 20%,transparent), transparent 62%),
    radial-gradient(52vw 52vw at 50% 108%, color-mix(in srgb,var(--c3) 18%,transparent), transparent 64%);
  filter:blur(24px); animation:hue 26s linear infinite;
}
.grid-floor{
  position:fixed; left:50%; bottom:-12vh; width:240vw; height:62vh; z-index:-1; pointer-events:none;
  background-image:
    linear-gradient(color-mix(in srgb,var(--primary) 55%,transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb,var(--primary) 55%,transparent) 1px, transparent 1px);
  background-size:64px 64px;
  transform:translateX(-50%) perspective(40vh) rotateX(62deg);
  transform-origin:bottom center; opacity:.16;
  -webkit-mask-image:linear-gradient(to top,#000 0%,transparent 85%);
          mask-image:linear-gradient(to top,#000 0%,transparent 85%);
  animation:floor 7s linear infinite;
}

/* ---------- nav ---------- */
.nav{position:fixed;inset:0 0 auto 0;z-index:50;transition:background .35s var(--ease),backdrop-filter .35s,border-color .35s}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:18px 24px;display:flex;align-items:center;gap:24px}
.nav.scrolled{background:color-mix(in srgb,var(--bg) 78%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--font-display);font-weight:900;letter-spacing:2px}
.brand-badge{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:var(--cell);
  border:1.5px solid var(--primary);color:var(--primary);font-family:var(--font-display);font-weight:900;font-style:italic;
  font-size:11px;letter-spacing:0;line-height:1;overflow:hidden;box-shadow:0 0 18px color-mix(in srgb,var(--primary) 50%,transparent)}
.brand-name{font-size:18px;color:#fff}
.nav-links{margin-left:auto;display:flex;align-items:center;gap:8px}
.nav-links a{font-family:var(--font-display);font-size:12px;font-weight:700;letter-spacing:2px;color:var(--muted);
  padding:10px 14px;border-radius:10px;transition:color .25s,background .25s}
.nav-links a:hover,.nav-links a.active{color:#fff;background:color-mix(in srgb,var(--primary) 12%,transparent)}
.nav-links a.btn--primary,.nav-links a.btn--primary:hover{color:#000;background:var(--primary)}
.nav-links a.btn--ghost,.nav-links a.btn--ghost:hover{color:#fff}
.theme-btn{width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:var(--surface);
  color:var(--primary);display:grid;place-items:center;cursor:pointer;transition:transform .3s var(--ease),box-shadow .3s,border-color .3s}
.theme-btn:hover{border-color:var(--primary);box-shadow:0 0 16px color-mix(in srgb,var(--primary) 45%,transparent)}
.theme-btn.spin svg{animation:spin .6s var(--ease)}
.burger{display:none;width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:var(--surface);
  cursor:pointer;position:relative}
.burger span{position:absolute;left:11px;right:11px;height:2px;background:#fff;border-radius:2px;transition:.3s var(--ease)}
.burger span:nth-child(1){top:15px}.burger span:nth-child(2){top:20px}.burger span:nth-child(3){top:25px}
body.nav-open .burger span:nth-child(1){top:20px;transform:rotate(45deg)}
body.nav-open .burger span:nth-child(2){opacity:0}
body.nav-open .burger span:nth-child(3){top:20px;transform:rotate(-45deg)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;letter-spacing:2px;
  font-size:13px;padding:16px 26px;border-radius:14px;cursor:pointer;border:1px solid transparent;
  transition:transform .25s var(--ease),box-shadow .3s,background .3s,color .3s;will-change:transform}
.btn--primary{background:var(--primary);color:#000;box-shadow:0 0 24px color-mix(in srgb,var(--primary) 45%,transparent)}
.btn--primary:hover{transform:translateY(-3px);box-shadow:0 0 38px color-mix(in srgb,var(--primary) 70%,transparent)}
.btn--ghost{background:transparent;color:#fff;border-color:color-mix(in srgb,var(--primary) 55%,transparent)}
.btn--ghost:hover{transform:translateY(-3px);background:color-mix(in srgb,var(--primary) 12%,transparent);border-color:var(--primary)}

/* ---------- layout ---------- */
.shell{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:88px 0;position:relative}
.section-head{max-width:680px;margin:0 auto 54px;text-align:center}
.eyebrow{display:inline-block;font-family:var(--font-display);font-size:11px;font-weight:700;letter-spacing:4px;
  color:var(--primary);padding:7px 14px;border:1px solid color-mix(in srgb,var(--primary) 40%,transparent);
  border-radius:999px;margin-bottom:18px;text-transform:uppercase}
.section-head h2{font-family:var(--font-display);font-weight:900;font-size:clamp(28px,5vw,44px);letter-spacing:1px;color:#fff;line-height:1.1}
.section-head p{margin-top:14px;color:var(--muted);font-size:18px}

/* ---------- hero ---------- */
.hero{min-height:100vh;display:flex;align-items:center;position:relative;padding:120px 0 80px;overflow:hidden}
.hero-inner{text-align:center;max-width:880px;margin:0 auto;position:relative;z-index:2}
.hero h1{font-family:var(--font-display);font-weight:900;font-style:italic;line-height:.95;letter-spacing:2px;
  font-size:clamp(72px,20vw,200px);
  background:linear-gradient(120deg,var(--primary),var(--c2) 45%,var(--c3) 70%,var(--c4));
  background-size:220% 220%;-webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:0 0 60px color-mix(in srgb,var(--primary) 30%,transparent);animation:flow 8s var(--ease) infinite}
.hero .sub{margin:22px auto 0;max-width:560px;font-size:clamp(18px,2.4vw,22px);color:var(--text)}
.hero .sub b{color:var(--primary)}
.hero-actions{margin-top:38px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.scroll-cue{position:absolute;left:50%;bottom:30px;transform:translateX(-50%);color:var(--muted);font-family:var(--font-display);
  font-size:10px;letter-spacing:3px;display:flex;flex-direction:column;align-items:center;gap:8px;z-index:2}
.scroll-cue i{width:22px;height:36px;border:2px solid var(--line);border-radius:12px;position:relative}
.scroll-cue i::after{content:'';position:absolute;top:6px;left:50%;width:3px;height:7px;border-radius:3px;background:var(--primary);transform:translateX(-50%);animation:dot 1.6s infinite}
.float-tiles{position:absolute;inset:0;z-index:1;pointer-events:none}
.tile-float{position:absolute;width:84px;height:84px;border-radius:16px;display:grid;place-items:center;
  font-family:var(--font-display);font-weight:900;font-size:26px;background:var(--cell);border:1px solid var(--line);
  opacity:.55;animation:float 9s ease-in-out infinite}

/* ---------- feature cards ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.card{background:linear-gradient(180deg,var(--surface),color-mix(in srgb,var(--surface) 70%,var(--bg)));
  border:1px solid var(--line);border-radius:var(--radius);padding:30px;position:relative;overflow:hidden;
  transition:transform .4s var(--ease),border-color .4s,box-shadow .4s}
.card::before{content:'';position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(135deg,var(--primary),transparent 40%);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .4s}
.card:hover{transform:translateY(-8px);border-color:transparent;box-shadow:0 24px 60px -24px color-mix(in srgb,var(--primary) 60%,transparent)}
.card:hover::before{opacity:1}
.card .ic{width:54px;height:54px;border-radius:14px;display:grid;place-items:center;font-size:26px;margin-bottom:18px;
  background:color-mix(in srgb,var(--primary) 12%,transparent);border:1px solid color-mix(in srgb,var(--primary) 35%,transparent)}
.card h3{font-family:var(--font-display);font-size:17px;letter-spacing:1px;color:#fff;margin-bottom:10px}
.card p{color:var(--muted);font-size:16px}

/* ---------- board showcase ---------- */
.showcase{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.showcase .copy h2{font-family:var(--font-display);font-weight:900;font-size:clamp(26px,4vw,38px);color:#fff;line-height:1.12;letter-spacing:1px}
.showcase .copy p{color:var(--muted);margin-top:16px;font-size:18px}
.showcase ul{list-style:none;margin-top:22px;display:grid;gap:12px}
.showcase li{display:flex;gap:12px;align-items:center;color:var(--text)}
.showcase li span{color:var(--primary);font-weight:900}
.board-wrap{display:grid;place-items:center}
.board{width:min(420px,90vw);aspect-ratio:1;padding:16px;border-radius:24px;background:var(--cell);
  border:1.5px solid color-mix(in srgb,var(--primary) 55%,transparent);
  box-shadow:0 0 50px -10px color-mix(in srgb,var(--primary) 45%,transparent),inset 0 0 40px rgba(0,0,0,.6);
  display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(4,1fr);gap:10px}
.cell{border-radius:12px;background:rgba(255,255,255,.03);display:grid;place-items:center;
  font-family:var(--font-display);font-weight:900;font-size:clamp(16px,4vw,26px);transition:.5s var(--ease)}
.cell[data-v]{animation:pop .5s var(--ease) both}
.cell.v2{color:#888;background:rgba(30,30,34,.6)}
.cell.v4{color:#999;background:rgba(30,30,34,.9)}
.cell.v8{color:var(--primary);box-shadow:0 0 18px color-mix(in srgb,var(--primary) 45%,transparent)}
.cell.v16{color:var(--c2);box-shadow:0 0 18px color-mix(in srgb,var(--c2) 45%,transparent)}
.cell.v32{color:var(--c3);box-shadow:0 0 18px color-mix(in srgb,var(--c3) 45%,transparent)}
.cell.v64{color:var(--red);box-shadow:0 0 18px color-mix(in srgb,var(--red) 45%,transparent)}
.cell.v128,.cell.v256{color:var(--c4);box-shadow:0 0 22px color-mix(in srgb,var(--c4) 45%,transparent)}
.cell.v2048{color:#fff;background:color-mix(in srgb,var(--primary) 18%,transparent);box-shadow:0 0 30px color-mix(in srgb,var(--primary) 70%,transparent)}

/* ---------- themes ---------- */
.swatch-row{display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.swatch{cursor:pointer;border:1px solid var(--line);background:var(--surface);border-radius:18px;padding:16px;width:150px;
  transition:transform .3s var(--ease),border-color .3s,box-shadow .3s}
.swatch:hover{transform:translateY(-6px)}
.swatch.active{border-color:var(--primary);box-shadow:0 0 26px color-mix(in srgb,var(--primary) 40%,transparent)}
.swatch .dots{display:flex;gap:8px;justify-content:center}
.swatch .dots i{width:22px;height:22px;border-radius:50%;box-shadow:0 0 12px currentColor}
.swatch .nm{display:block;text-align:center;margin-top:12px;font-family:var(--font-display);font-size:11px;letter-spacing:2px;color:var(--muted)}

/* ---------- cta ---------- */
.cta-card{max-width:880px;margin:0 auto;text-align:center;padding:56px 32px;border-radius:28px;position:relative;overflow:hidden;
  background:linear-gradient(180deg,var(--surface),var(--cell));border:1px solid color-mix(in srgb,var(--primary) 30%,transparent)}
.cta-card::after{content:'';position:absolute;inset:0;background:radial-gradient(60% 80% at 50% 0%,color-mix(in srgb,var(--primary) 18%,transparent),transparent 70%);pointer-events:none}
.cta-card h2{position:relative;font-family:var(--font-display);font-weight:900;font-size:clamp(26px,4vw,40px);color:#fff;letter-spacing:1px}
.cta-card p{position:relative;color:var(--muted);margin:14px auto 28px;max-width:480px}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--line);padding:54px 0 40px;margin-top:30px}
.footer-grid{display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap;align-items:flex-start}
.footer-brand p{color:var(--muted);max-width:300px;margin-top:14px;font-size:15px}
.footer-col h4{font-family:var(--font-display);font-size:11px;letter-spacing:3px;color:#fff;margin-bottom:14px}
.footer-col a{display:block;color:var(--muted);padding:6px 0;font-size:15px;transition:color .25s}
.footer-col a:hover{color:var(--primary)}
.copy{margin-top:38px;padding-top:22px;border-top:1px solid var(--line);color:var(--muted);font-size:13px;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-family:var(--font-display);letter-spacing:1px}

/* ---------- legal ---------- */
.legal{padding:140px 0 60px;max-width:840px;margin:0 auto}
.legal-head{margin-bottom:36px}
.legal-head h1{font-family:var(--font-display);font-weight:900;font-size:clamp(32px,6vw,52px);color:#fff;letter-spacing:1px;line-height:1.05}
.updated{display:inline-block;margin-top:16px;font-family:var(--font-display);font-size:11px;letter-spacing:2px;color:var(--primary);
  border:1px solid color-mix(in srgb,var(--primary) 40%,transparent);border-radius:999px;padding:7px 14px}
.note{display:flex;gap:14px;background:color-mix(in srgb,var(--c4) 10%,transparent);border:1px solid color-mix(in srgb,var(--c4) 35%,transparent);
  border-radius:16px;padding:18px 20px;margin:26px 0;color:var(--text);font-size:15px}
.note b{color:var(--c4)}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:22px 26px;margin:30px 0}
.toc h4{font-family:var(--font-display);font-size:11px;letter-spacing:3px;color:var(--muted);margin-bottom:14px}
.toc ol{list-style:none;counter-reset:t;display:grid;gap:8px}
.toc li{counter-increment:t}
.toc a{color:var(--text);font-size:16px;transition:color .25s;display:flex;gap:12px}
.toc a::before{content:counter(t,decimal-leading-zero);color:var(--primary);font-family:var(--font-display);font-size:13px}
.toc a:hover{color:var(--primary)}
.legal-body section{padding-top:24px;margin-top:24px;scroll-margin-top:100px}
.legal-body h2{font-family:var(--font-display);font-weight:800;font-size:21px;color:#fff;letter-spacing:.5px;
  padding-left:16px;border-left:3px solid var(--primary);margin-bottom:14px;line-height:1.3}
.legal-body p{color:var(--muted);margin-bottom:14px;font-size:17px}
.legal-body ul{color:var(--muted);margin:0 0 14px 4px;padding-left:22px;display:grid;gap:8px;font-size:17px}
.legal-body a{color:var(--primary)}
.legal-body strong{color:var(--text)}

/* ---------- to top ---------- */
.to-top{position:fixed;right:24px;bottom:24px;width:48px;height:48px;border-radius:14px;background:var(--surface);
  border:1px solid var(--line);color:var(--primary);display:grid;place-items:center;cursor:pointer;z-index:40;
  opacity:0;transform:translateY(16px);pointer-events:none;transition:.35s var(--ease)}
.to-top.show{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{border-color:var(--primary);box-shadow:0 0 18px color-mix(in srgb,var(--primary) 45%,transparent)}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal[data-d='1']{transition-delay:.08s}.reveal[data-d='2']{transition-delay:.16s}
.reveal[data-d='3']{transition-delay:.24s}.reveal[data-d='4']{transition-delay:.32s}

/* ---------- keyframes ---------- */
@keyframes hue{to{filter:blur(24px) hue-rotate(360deg)}}
@keyframes floor{to{background-position:0 64px,64px 0}}
@keyframes flow{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}
@keyframes float{0%,100%{transform:translateY(0) rotate(-4deg)}50%{transform:translateY(-26px) rotate(4deg)}}
@keyframes pop{0%{transform:scale(.6);opacity:0}100%{transform:scale(1);opacity:1}}
@keyframes spin{to{transform:rotate(180deg)}}
@keyframes dot{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}100%{opacity:0;transform:translate(-50%,12px)}}

/* ---------- responsive ---------- */
@media(max-width:860px){
  .showcase{grid-template-columns:1fr;gap:36px}
  .board-wrap{order:-1}
  .nav-links{position:fixed;inset:72px 16px auto 16px;flex-direction:column;align-items:stretch;gap:6px;
    background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(16px);border:1px solid var(--line);
    border-radius:18px;padding:14px;transform:translateY(-12px) scale(.98);opacity:0;pointer-events:none;transition:.3s var(--ease)}
  body.nav-open .nav-links{transform:none;opacity:1;pointer-events:auto}
  .nav-links a{padding:14px;font-size:13px}
  .nav-links .btn{justify-content:center}
  .burger{display:block;margin-left:auto;order:3}
  .theme-btn{order:2}
}
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}

/* ===== v2: richer motion & interactivity ===== */
.scroll-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:60;pointer-events:none}
.scroll-progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--primary),var(--c2),var(--c3));box-shadow:0 0 12px var(--primary);transition:width .1s linear}
.spotlight{position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(300px 300px at var(--mx,50%) var(--my,28%),color-mix(in srgb,var(--primary) 16%,transparent),transparent 70%)}
.float-tiles{transition:transform .25s var(--ease)}
.btn{position:relative;overflow:hidden}
.btn--primary::after{content:'';position:absolute;top:0;left:-130%;width:55%;height:100%;background:linear-gradient(120deg,transparent,rgba(255,255,255,.5),transparent);transform:skewX(-20deg);transition:left .65s var(--ease);pointer-events:none}
.btn--primary:hover::after{left:150%}
[data-tilt]{transition:transform .25s var(--ease);transform-style:preserve-3d}
.card .ic,.card h3,.card p{transform:translateZ(26px)}
/* marquee */
.marquee{overflow:hidden;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:20px 0;background:color-mix(in srgb,var(--surface) 35%,transparent)}
.marquee-track{display:flex;gap:46px;width:max-content;white-space:nowrap;animation:marq 24s linear infinite;font-family:var(--font-display);font-weight:900;font-size:clamp(20px,3vw,30px);letter-spacing:5px}
.marquee-track span{color:transparent;-webkit-text-stroke:1px color-mix(in srgb,var(--muted) 70%,transparent)}
.marquee-track span.fill{color:var(--primary);-webkit-text-stroke:0;text-shadow:0 0 18px color-mix(in srgb,var(--primary) 55%,transparent)}
.marquee:hover .marquee-track{animation-play-state:paused}
@keyframes marq{to{transform:translateX(-50%)}}
/* stats */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:18px}
.stat{background:linear-gradient(180deg,var(--surface),var(--cell));border:1px solid var(--line);border-radius:18px;padding:30px 22px;text-align:center;transition:transform .4s var(--ease),border-color .4s,box-shadow .4s}
.stat:hover{transform:translateY(-6px);border-color:color-mix(in srgb,var(--primary) 55%,transparent);box-shadow:0 18px 44px -20px color-mix(in srgb,var(--primary) 70%,transparent)}
.stat b{display:block;font-family:var(--font-display);font-weight:900;font-size:clamp(34px,6vw,54px);line-height:1;background:linear-gradient(120deg,var(--primary),var(--c2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{display:block;margin-top:12px;color:var(--muted);font-family:var(--font-display);font-size:11px;letter-spacing:2px}
/* playable game */
.game{width:min(440px,92vw);margin:0 auto}
.game-top{display:flex;gap:12px;align-items:center;margin-bottom:16px}
.score-chip{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:8px 16px;text-align:center;min-width:82px}
.score-chip span{display:block;font-family:var(--font-display);font-size:9px;letter-spacing:2px;color:var(--muted)}
.score-chip b{font-family:var(--font-display);font-size:20px;color:#fff}
.game-new{margin-left:auto;padding:13px 18px;font-size:11px}
.board{position:relative;display:block;width:100%;aspect-ratio:1;padding:14px;touch-action:none;overflow:hidden}
.grid-bg{position:absolute;inset:14px;display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(4,1fr);gap:12px}
.gc{border-radius:12px;background:rgba(255,255,255,.03)}
.tiles{position:absolute;inset:14px}
.tile{position:absolute;top:0;left:0;transition:transform .13s var(--ease);will-change:transform}
.tinner{width:100%;height:100%;display:grid;place-items:center;border-radius:12px;font-family:var(--font-display);font-weight:900;font-size:clamp(20px,5.5vw,32px);background:var(--cell);transition:transform .12s var(--ease)}
.tile.spawn .tinner{animation:tspawn .2s var(--ease)}
.tile.merge .tinner{animation:tmerge .22s var(--ease)}
@keyframes tspawn{0%{transform:scale(.2);opacity:0}100%{transform:scale(1);opacity:1}}
@keyframes tmerge{0%{transform:scale(1)}45%{transform:scale(1.2)}100%{transform:scale(1)}}
.t2 .tinner{color:#8a8a8a;background:rgba(34,34,40,.7)}
.t4 .tinner{color:#b0b0b0;background:rgba(34,34,40,.95)}
.t8 .tinner{color:#000;background:var(--primary);box-shadow:0 0 22px color-mix(in srgb,var(--primary) 55%,transparent)}
.t16 .tinner{color:#000;background:var(--c2);box-shadow:0 0 22px color-mix(in srgb,var(--c2) 55%,transparent)}
.t32 .tinner{color:#000;background:var(--c3);box-shadow:0 0 22px color-mix(in srgb,var(--c3) 55%,transparent)}
.t64 .tinner{color:#fff;background:var(--red);box-shadow:0 0 24px color-mix(in srgb,var(--red) 55%,transparent)}
.t128 .tinner,.t256 .tinner,.t512 .tinner{color:#000;background:var(--c4);box-shadow:0 0 26px color-mix(in srgb,var(--c4) 60%,transparent)}
.t1024 .tinner{color:#000;background:linear-gradient(135deg,var(--primary),var(--c2));box-shadow:0 0 30px color-mix(in srgb,var(--primary) 70%,transparent)}
.t2048 .tinner{color:#000;background:linear-gradient(135deg,var(--primary),var(--c3),var(--c4));box-shadow:0 0 40px color-mix(in srgb,var(--primary) 85%,transparent)}
.t128 .tinner,.t256 .tinner,.t512 .tinner,.t1024 .tinner,.t2048 .tinner{font-size:clamp(15px,4vw,25px)}
.game-over{position:absolute;inset:0;display:none;place-items:center;text-align:center;border-radius:inherit;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(5px);z-index:6}
.game-over.show{display:grid;animation:fade .35s var(--ease)}
.game-over h3{font-family:var(--font-display);font-weight:900;font-size:clamp(24px,6vw,34px);color:#fff;letter-spacing:2px;margin-bottom:12px;text-shadow:0 0 24px color-mix(in srgb,var(--primary) 60%,transparent)}
.go-msg{max-width:300px;margin:0 auto 18px;color:var(--muted);font-size:14px;line-height:1.5;padding:0 14px;font-family:var(--font-body)}
.go-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.go-actions .btn{padding:13px 20px;font-size:11px}
@keyframes fade{from{opacity:0}}
.hint{text-align:center;color:var(--muted);font-size:12px;margin-top:16px;font-family:var(--font-display);letter-spacing:1px}
@media(max-width:860px){.card .ic,.card h3,.card p{transform:none}}