/* TreadHeads marketing site — neon-noir charcoal, restrained cyan/amber accents
   (matches the game's art direction). Single hand-built stylesheet, no build step. */

:root{
  --bg:#0a0d12;
  --bg2:#0f141b;
  --panel:#121821;
  --line:#222b37;
  --ink:#e6edf3;
  --muted:#8c97a6;
  --cyan:#27e0e0;
  --amber:#ffb02e;
  --maxw:1120px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3{line-height:1.1;letter-spacing:-0.02em;margin:0 0 .4em}
h2{font-size:clamp(1.6rem,3.4vw,2.4rem);text-align:center;margin-bottom:1.2em}
a{color:inherit;text-decoration:none}
section{padding:clamp(3rem,7vw,6rem) 1.25rem}
img{max-width:100%;display:block}

/* ---- nav ---- */
.nav{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;justify-content:space-between;
  padding:.85rem clamp(1rem,4vw,2rem);
  background:rgba(10,13,18,.72);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.brand{font-weight:800;letter-spacing:.04em;font-size:1.05rem}
.brand span{color:var(--cyan)}
.nav-cta{
  font-weight:700;font-size:.9rem;padding:.5rem .9rem;border-radius:8px;
  border:1px solid var(--cyan);color:var(--cyan);
}
.nav-cta:hover{background:var(--cyan);color:#04201f}

/* ---- buttons ---- */
.btn{
  display:inline-block;font-weight:700;padding:.8rem 1.4rem;border-radius:10px;
  border:1px solid transparent;cursor:pointer;font-size:1rem;transition:.15s;
}
.btn.primary{background:var(--cyan);color:#042220;box-shadow:0 0 0 1px rgba(39,224,224,.3),0 8px 30px -10px var(--cyan)}
.btn.primary:hover{transform:translateY(-1px);filter:brightness(1.08)}
.btn.ghost{border-color:var(--line);color:var(--ink)}
.btn.ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---- hero ---- */
.hero{
  position:relative;
  display:flex;flex-direction:column;align-items:center;text-align:center;
  max-width:var(--maxw);margin:0 auto;
  padding-top:clamp(2.5rem,6vw,4.5rem);
}
.hero-glow{
  position:absolute;inset:-20% -10% auto -10%;height:80vh;pointer-events:none;z-index:-1;
  background:
    radial-gradient(45% 50% at 50% 22%,rgba(39,224,224,.18),transparent 70%),
    radial-gradient(50% 55% at 75% 12%,rgba(255,176,46,.12),transparent 70%);
  filter:blur(10px);
}
.hero-inner{display:flex;flex-direction:column;align-items:center;width:100%}
.logo{display:block;width:min(820px,92vw);max-height:none;margin:0 auto .6rem}
.logo-text{font-size:clamp(3.4rem,12vw,7rem);font-weight:900;letter-spacing:-.03em;margin:0 0 .25em}
.logo-text span{color:var(--cyan)}
.tagline{font-size:clamp(1.4rem,3.4vw,2.1rem);font-weight:800;margin:.2rem 0 .6rem}
.sub{color:var(--muted);max-width:54ch;font-size:clamp(1.02rem,1.6vw,1.15rem)}
.hero-cta{display:flex;gap:.8rem;flex-wrap:wrap;justify-content:center;margin:1.8rem 0 1.1rem}
.platforms{display:flex;gap:.5rem;flex-wrap:wrap;justify-content:center}
.chip{
  font-size:.78rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;
  padding:.35rem .7rem;border:1px solid var(--line);border-radius:999px;color:var(--muted);
}
.hero-shot{margin:clamp(2rem,5vw,3.5rem) 0 0;width:100%;max-width:920px}
.hero-shot img{
  width:100%;border-radius:16px;border:1px solid var(--line);
  box-shadow:0 30px 80px -30px rgba(0,0,0,.8),0 0 0 1px rgba(39,224,224,.08);
}

/* ---- strip ---- */
.strip{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.strip p{max-width:760px;margin:0 auto;text-align:center;font-size:clamp(1.1rem,2.6vw,1.45rem);color:var(--ink)}

/* ---- features ---- */
.features{max-width:var(--maxw);margin:0 auto}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:1.5rem;
  transition:.18s;
}
.card:hover{border-color:rgba(39,224,224,.4);transform:translateY(-3px)}
.card .ico{font-size:2rem;margin-bottom:.5rem}
.card .ico-img{width:52px;height:52px;object-fit:contain;margin-bottom:.5rem}
.card h3{font-size:1.15rem}
.card p{color:var(--muted);margin:0;font-size:.96rem}

/* ---- showcase ---- */
.showcase{max-width:var(--maxw);margin:0 auto}
.showcase figure{margin:0}
.showcase img{width:100%;border-radius:16px;border:1px solid var(--line)}
.showcase figcaption{text-align:center;color:var(--muted);margin-top:.8rem;font-size:.92rem}

/* ---- how to ---- */
.howto{max-width:880px;margin:0 auto}
.steps{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.steps li{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:1.4rem;text-align:center}
.steps span{
  display:inline-grid;place-items:center;width:42px;height:42px;border-radius:50%;
  background:rgba(39,224,224,.12);color:var(--cyan);font-weight:800;font-size:1.2rem;margin-bottom:.7rem;
}
.steps p{margin:0;color:var(--muted)}
.steps b{color:var(--ink)}

/* ---- beta ---- */
.beta{background:var(--bg2);border-top:1px solid var(--line)}
.beta-card{
  max-width:560px;margin:0 auto;background:var(--panel);border:1px solid var(--line);
  border-radius:18px;padding:clamp(1.6rem,4vw,2.6rem);text-align:center;
  box-shadow:0 30px 90px -40px rgba(39,224,224,.25);
}
.beta-card p{color:var(--muted)}
#signup{display:flex;flex-direction:column;gap:.9rem;margin-top:1.4rem;text-align:left}
#signup input[type=email]{
  background:var(--bg);border:1px solid var(--line);border-radius:10px;color:var(--ink);
  padding:.9rem 1rem;font-size:1rem;width:100%;
}
#signup input[type=email]:focus{outline:none;border-color:var(--cyan)}
.seg{display:flex;gap:.6rem}
.seg label{
  flex:1;display:flex;align-items:center;justify-content:center;gap:.5rem;
  border:1px solid var(--line);border-radius:10px;padding:.75rem;cursor:pointer;font-weight:700;
  color:var(--muted);transition:.15s;
}
.seg label:has(input:checked){border-color:var(--cyan);color:var(--cyan);background:rgba(39,224,224,.08)}
.seg input{accent-color:var(--cyan)}
#signup .btn{margin-top:.2rem}
.form-msg{margin:.2rem 0 0;min-height:1.2em;font-size:.92rem;font-weight:600}
.form-msg.ok{color:var(--cyan)}
.form-msg.err{color:#ff7a7a}

/* ---- footer ---- */
.foot{text-align:center;border-top:1px solid var(--line);color:var(--muted);padding:2.5rem 1rem}
.foot .muted{font-size:.85rem;opacity:.7}

/* ---- responsive ---- */
@media (max-width:880px){
  .hero{grid-template-columns:1fr;text-align:center}
  .hero .sub{margin-inline:auto}
  .hero-cta,.platforms{justify-content:center}
  .grid{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr}
}
@media (max-width:560px){
  .grid{grid-template-columns:1fr}
}