/* Neon Snake for HAKER333
   Clean, responsive, glass + neon look.
   No frameworks, just HTML/CSS/JS.
*/

:root{
  --neon:#00ffc6;
  --neon2:#00d4ff;
  --danger:#ff3b66;
  --bg:#060a0f;
  --glass: rgba(8, 14, 20, 0.52);
  --glass2: rgba(8, 14, 20, 0.26);
  --stroke: rgba(0,255,198,.22);
  --text:#e9fff9;
  --muted: rgba(233,255,249,.72);
  --shadow: 0 0 24px rgba(0,255,198,.18), 0 0 64px rgba(0,255,198,.10);
  --radius: 18px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  background: var(--bg);
  color:var(--text);
  overflow-x:hidden;
}

.bg{
  position:fixed; inset:0;
  background:
    radial-gradient(70% 55% at 50% 40%, rgba(0,255,198,.12), transparent 55%),
    radial-gradient(55% 45% at 75% 60%, rgba(0,212,255,.10), transparent 60%),
    linear-gradient(180deg, rgba(0,0,0,.55), rgba(0,0,0,.88)),
    url("assets/bg.png");
  background-size: cover;
  background-position:center;
  filter: blur(6px) saturate(1.05);
  transform: scale(1.08);
  opacity:.92;
}
.vignette{
  position:fixed; inset:0;
  background: radial-gradient(100% 100% at 50% 50%, transparent 40%, rgba(0,0,0,.78) 80%, rgba(0,0,0,.92) 100%);
  pointer-events:none;
}
.noise{
  position:fixed; inset:0;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.14'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
  opacity:.12;
  pointer-events:none;
}

.wrap{
  min-height:100%;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:flex-start;
  gap: 18px;
  padding: 32px 16px 18px;
}

.hero{
  width:min(1040px, 100%);
  text-align:center;
  padding: 6px 6px 0;
}

.brand{
  font-weight: 800;
  letter-spacing: .22em;
  font-size: clamp(34px, 5.2vw, 62px);
  color: var(--neon);
  text-shadow: 0 0 18px rgba(0,255,198,.55), 0 0 64px rgba(0,255,198,.22);
}
.sub{
  margin-top: 6px;
  font-size: 14px;
  color: rgba(0,255,198,.70);
  letter-spacing:.14em;
  text-transform: none;
}

.hud{
  margin: 18px auto 10px;
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap: 10px;
}
.pill{
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--glass2);
  border: 1px solid rgba(255,255,255,.06);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  display:flex;
  gap:10px;
  align-items:baseline;
}
.pill .k{
  font-size: 12px;
  letter-spacing:.16em;
  color: rgba(233,255,249,.66);
  text-transform:uppercase;
}
.pill .v{
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}
.pill-wide{ min-width: 210px; justify-content:center; }

.chips{
  margin: 10px auto 0;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap: 8px;
  min-height: 28px;
}
.chip{
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(0,255,198,.10);
  border: 1px solid rgba(0,255,198,.22);
  color: rgba(233,255,249,.92);
  font-weight: 700;
  letter-spacing:.06em;
  box-shadow: 0 0 16px rgba(0,255,198,.18);
}

.stage{
  width:min(1040px, 100%);
  display:flex;
  justify-content:center;
}
.glass{
  position:relative;
  width:min(840px, 100%);
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid rgba(0,255,198,.16);
  box-shadow: 0 0 36px rgba(0,255,198,.12), 0 0 120px rgba(0,255,198,.08);
  backdrop-filter: blur(12px);
  overflow:hidden;
}
canvas{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:1/1;
}

.top-actions{
  position:absolute;
  top: 10px;
  right: 10px;
  display:flex;
  gap: 8px;
}
.iconbtn{
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.08);
  background: rgba(8,14,20,.45);
  color: var(--text);
  cursor:pointer;
  box-shadow: 0 0 18px rgba(0,255,198,.14);
  backdrop-filter: blur(10px);
}
.iconbtn:hover{
  border-color: rgba(0,255,198,.25);
  box-shadow: 0 0 22px rgba(0,255,198,.22);
}
.ic{ font-size: 18px; }

.overlay{
  position:absolute; inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 18px;
}
.overlay[hidden]{ display:none; }
.overlay-card{
  width: min(620px, 100%);
  border-radius: 22px;
  background: rgba(8,14,20,.66);
  border: 1px solid rgba(0,255,198,.20);
  box-shadow: 0 0 30px rgba(0,255,198,.16);
  backdrop-filter: blur(14px);
  padding: 18px 18px 16px;
  text-align:center;
}
.overlay-title{
  font-weight: 900;
  letter-spacing:.20em;
  color: var(--neon);
  text-shadow: 0 0 18px rgba(0,255,198,.55);
}
.overlay-text{
  margin-top: 10px;
  color: rgba(233,255,249,.78);
  line-height: 1.45;
  font-size: 14px;
}

.overlay-actions{
  margin-top: 16px;
  display:flex;
  flex-wrap:wrap;
  gap: 10px;
  justify-content:center;
}
.btn{
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.08);
  background: rgba(8,14,20,.35);
  color: var(--text);
  cursor:pointer;
  font-weight: 800;
  letter-spacing:.06em;
  box-shadow: 0 0 18px rgba(0,255,198,.12);
}
.btn:hover{ border-color: rgba(0,255,198,.25); }
.btn.primary{
  background: rgba(0,255,198,.14);
  border-color: rgba(0,255,198,.26);
  box-shadow: 0 0 22px rgba(0,255,198,.22);
}

.how{
  margin-top: 14px;
  display:none;
}
.how.open{ display:block; }
.how-grid{
  margin-top: 8px;
  display:grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 10px;
}
@media (max-width:520px){
  .how-grid{ grid-template-columns: 1fr; }
}
.how-item{
  text-align:left;
  padding: 12px 12px;
  border-radius: 16px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.06);
}
.tag{
  display:inline-flex;
  gap:8px;
  align-items:center;
  color: rgba(233,255,249,.92);
  font-weight: 900;
  letter-spacing:.06em;
}
.txt{
  margin-top:6px;
  color: rgba(233,255,249,.72);
  font-size: 13px;
}
.mini{
  margin-top: 10px;
  font-size: 12px;
  color: rgba(0,255,198,.75);
  letter-spacing:.08em;
}

.footer{
  width:min(1040px, 100%);
  display:flex;
  flex-direction:column;
  gap: 10px;
  align-items:center;
  padding-bottom: 10px;
}
.controls{
  width: min(700px, 100%);
  display:flex;
  align-items:center;
  gap: 12px;
}
.ctrl{
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: 1px solid rgba(0,255,198,.25);
  background: rgba(8,14,20,.40);
  color: var(--neon);
  cursor:pointer;
  box-shadow: 0 0 22px rgba(0,255,198,.14);
}
.ctrl:hover{ box-shadow: 0 0 22px rgba(0,255,198,.25); }
.bar{
  position:relative;
  flex:1;
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  overflow:hidden;
}
.bar-fill{
  position:absolute;
  inset:0;
  width: 40%;
  background: rgba(0,255,198,.55);
  box-shadow: 0 0 18px rgba(0,255,198,.35);
}

.hint{
  display:flex;
  gap: 10px;
  align-items:center;
  color: rgba(233,255,249,.75);
  font-size: 13px;
  letter-spacing:.02em;
}
.dot{
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 16px rgba(0,255,198,.65);
}
.meta{
  color: rgba(233,255,249,.55);
  font-size: 12px;
  letter-spacing:.10em;
}

/* Mobile controller */
.mobile{
  position: fixed;
  bottom: 16px;
  left: 16px;
  display:none;
  gap: 10px;
  flex-direction:column;
  z-index: 5;
}
.mobile .row{ display:flex; gap: 10px; justify-content:center; }
.mbtn{
  width: 60px;
  height: 54px;
  border-radius: 18px;
  border: 1px solid rgba(0,255,198,.22);
  background: rgba(8,14,20,.45);
  color: var(--neon);
  font-weight: 900;
  cursor:pointer;
  box-shadow: 0 0 18px rgba(0,255,198,.14);
  backdrop-filter: blur(10px);
}
.mbtn:active{ transform: translateY(1px); }

@media (hover:none) and (pointer:coarse){
  .mobile{ display:flex; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{ scroll-behavior:auto !important; transition:none !important; animation:none !important; }
}

.back-btn {
    position: fixed;
    top: 25px;
    right: 25px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: rgba(0, 255, 200, 0.15);
    border: 1px solid rgba(0, 255, 200, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(6px);
    box-shadow: 0 0 18px rgba(0,255,200,.7);
    transition: 0.25s ease;
    z-index: 999;
}

.back-btn:hover {
    transform: scale(1.15);
    box-shadow: 0 0 35px rgba(0,255,200,1);
}