:root {
  --bg: #040711;
  --panel: rgba(11, 18, 38, 0.72);
  --text: #edf7ff;
  --muted: #91a4bd;
  --ice: #42dcff;
  --ice-deep: #126dff;
  --fire: #ff7343;
  --fire-deep: #ff2d1f;
  --line: rgba(255,255,255,0.12);
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 20%, rgba(0, 139, 255, 0.15), transparent 35%),
    radial-gradient(circle at 84% 28%, rgba(255, 55, 18, 0.14), transparent 35%),
    linear-gradient(180deg, #02040a 0%, #060b18 55%, #03050b 100%);
  font-family: "Rajdhani", system-ui, sans-serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.02) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.02) 1px, transparent 1px);
  background-size: 38px 38px;
  mask-image: linear-gradient(to bottom, black, transparent 86%);
}

.ambient { position: fixed; width: 34vw; height: 34vw; border-radius: 50%; filter: blur(100px); opacity: .18; pointer-events: none; }
.ambient-ice { background: var(--ice); left: -16vw; top: 24vh; }
.ambient-fire { background: var(--fire); right: -16vw; top: 20vh; }

button, select { font: inherit; }
button { cursor: pointer; }

.app-shell { width: min(1180px, calc(100% - 30px)); margin: 0 auto; padding-bottom: 40px; position: relative; z-index: 1; }
.topbar { height: 90px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; font-family: "Orbitron", sans-serif; }
.brand-mark { color: var(--ice); text-shadow: 0 0 20px var(--ice); font-size: 30px; }
.brand strong { display:block; letter-spacing: .14em; font-size: 14px; }
.brand small { display:block; color: var(--muted); letter-spacing:.25em; font-size:9px; margin-top:4px; }

.icon-btn, .small-btn {
  color: #eaf7ff;
  background: rgba(255,255,255,.055);
  border: 1px solid var(--line);
  border-radius: 12px;
  min-width: 45px;
  height: 42px;
  backdrop-filter: blur(12px);
  box-shadow: inset 0 1px rgba(255,255,255,.08);
}
.small-btn { padding: 0 16px; font-weight: 700; letter-spacing: .08em; }
.small-btn.danger { border-color: rgba(255,91,63,.35); color:#ffc0b2; }

.screen { display: none; }
.screen.active { display: block; animation: screenIn .4s ease; }
@keyframes screenIn { from { opacity:0; transform: translateY(8px);} to {opacity:1; transform:none;} }

.home-screen { padding: 56px 0 20px; text-align:center; }
.hero-copy { max-width: 900px; margin: 0 auto 42px; }
.eyebrow { margin:0 0 14px; color:#a8bbcf; font-size:12px; font-weight:700; letter-spacing:.32em; }
h1, h2, h3 { font-family:"Orbitron", sans-serif; }
h1 { margin:0; font-size:clamp(38px, 7vw, 82px); line-height:1.05; letter-spacing:.05em; }
.ice-text { color:#bff5ff; text-shadow: 0 0 12px #4ddfff, 0 0 35px rgba(25,141,255,.75); }
.fire-text { color:#ffd1bd; text-shadow: 0 0 12px #ff6e3d, 0 0 35px rgba(255,46,25,.72); }
.hero-description { max-width:720px; margin:22px auto 0; color:var(--muted); font-size:19px; line-height:1.55; }

.home-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:18px; max-width:900px; margin:0 auto; }
.mode-card { position:relative; display:flex; gap:18px; align-items:center; min-height:128px; text-align:left; padding:24px; border-radius:22px; border:1px solid var(--line); background:rgba(9,15,31,.72); backdrop-filter:blur(20px); transition:.25s ease; overflow:hidden; }
.mode-card::before { content:""; position:absolute; inset:0; opacity:0; transition:.25s; }
.ice-card::before { background:linear-gradient(120deg, rgba(27,165,255,.15), transparent 55%); }
.fire-card::before { background:linear-gradient(120deg, rgba(255,77,30,.15), transparent 55%); }
.mode-card:hover, .mode-card.selected { transform:translateY(-3px); border-color:rgba(255,255,255,.25); }
.mode-card.selected::before { opacity:1; }
.ice-card.selected { box-shadow:0 0 38px rgba(17,145,255,.18), inset 0 1px rgba(255,255,255,.08); }
.fire-card.selected { box-shadow:0 0 38px rgba(255,65,27,.18), inset 0 1px rgba(255,255,255,.08); }
.mode-card > * { position:relative; z-index:1; }
.mode-icon { width:58px; height:58px; border-radius:18px; display:grid; place-items:center; font-size:29px; background:rgba(255,255,255,.06); }
.mode-card h2 { margin:0 0 6px; font-size:18px; }
.mode-card p { margin:0; color:var(--muted); }
.radio-dot { margin-left:auto; width:17px; height:17px; border:2px solid rgba(255,255,255,.4); border-radius:50%; }
.mode-card.selected .radio-dot { background:#fff; box-shadow:0 0 16px currentColor; }
.ice-card.selected .radio-dot { color:var(--ice); border-color:var(--ice); }
.fire-card.selected .radio-dot { color:var(--fire); border-color:var(--fire); }

.glass-panel { background:rgba(9,16,34,.72); border:1px solid var(--line); backdrop-filter:blur(18px); box-shadow:inset 0 1px rgba(255,255,255,.07), 0 20px 50px rgba(0,0,0,.22); }
.control-panel { max-width:900px; margin:18px auto 0; padding:18px; border-radius:18px; display:grid; grid-template-columns:repeat(2,1fr); gap:14px; text-align:left; }
.field-group label { display:block; margin:0 0 8px; color:#b4c5d8; font-size:12px; font-weight:700; letter-spacing:.13em; text-transform:uppercase; }
.field-group select { width:100%; height:48px; border-radius:12px; border:1px solid rgba(255,255,255,.12); color:#fff; background:#0c1426; padding:0 13px; outline:none; }

.primary-btn { margin-top:28px; min-width:260px; height:62px; padding:0 24px; border:0; border-radius:17px; color:#06121d; font-family:"Orbitron",sans-serif; font-weight:800; letter-spacing:.11em; background:linear-gradient(100deg, #8af1ff, #fff 48%, #ffb083); box-shadow:0 0 25px rgba(79,220,255,.25), 0 0 35px rgba(255,81,38,.18), inset 0 2px rgba(255,255,255,.8); transition:.2s; }
.primary-btn:hover { transform:translateY(-2px) scale(1.01); filter:brightness(1.08); }
.primary-btn b { margin-left:14px; }
.primary-btn.compact { min-width:170px; height:50px; margin-top:10px; }
.quick-guide { margin-top:24px; display:flex; justify-content:center; gap:24px; flex-wrap:wrap; color:var(--muted); font-size:12px; letter-spacing:.08em; }
kbd { min-width:25px; display:inline-grid; place-items:center; margin-right:4px; padding:3px 7px; border-radius:7px; color:#dff8ff; border:1px solid rgba(255,255,255,.14); background:rgba(255,255,255,.06); box-shadow:inset 0 -2px rgba(0,0,0,.25); }

.game-screen { padding-top:18px; }
.game-heading { display:flex; justify-content:space-between; align-items:end; margin-bottom:14px; }
.game-heading h2 { margin:0; font-size:clamp(22px,4vw,36px); letter-spacing:.1em; }
.game-actions { display:flex; gap:8px; }
.scoreboard { width:min(720px,100%); margin:0 auto 15px; border-radius:18px; display:grid; grid-template-columns:1fr 1.15fr 1fr; align-items:center; overflow:hidden; }
.score-side { min-height:78px; display:flex; align-items:center; justify-content:center; gap:16px; }
.score-side small { font-family:"Orbitron"; letter-spacing:.2em; font-weight:700; }
.score-side strong { font-family:"Orbitron"; font-size:42px; }
.score-ice { color:#9feeff; background:linear-gradient(90deg,rgba(21,147,255,.18),transparent); }
.score-fire { color:#ffc0a4; background:linear-gradient(-90deg,rgba(255,66,25,.18),transparent); }
.versus-block { text-align:center; border-left:1px solid var(--line); border-right:1px solid var(--line); padding:10px; }
.versus-block span,.versus-block small { display:block; color:var(--muted); font-size:10px; letter-spacing:.18em; }
.versus-block b { display:block; font-family:"Orbitron"; margin:3px 0; }

.canvas-wrap { position:relative; border-radius:28px; padding:10px; background:linear-gradient(115deg,rgba(63,212,255,.35),rgba(255,255,255,.08) 47%,rgba(255,83,37,.35)); box-shadow:0 0 55px rgba(18,133,255,.13), 0 0 55px rgba(255,58,25,.12); }
.canvas-wrap::before { content:""; position:absolute; inset:1px; border-radius:27px; background:rgba(4,8,18,.88); }
canvas { position:relative; z-index:1; display:block; width:100%; aspect-ratio:1200/680; border-radius:20px; touch-action:none; }
.countdown { position:absolute; z-index:5; inset:0; display:grid; place-items:center; font:800 clamp(70px,14vw,160px)/1 "Orbitron"; text-shadow:0 0 35px white; }
.hidden { display:none !important; }
.overlay-panel { position:absolute; z-index:6; inset:10px; border-radius:20px; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; background:rgba(3,7,17,.75); backdrop-filter:blur(13px); }
.overlay-panel h3 { margin:0; font-size:clamp(38px,7vw,78px); letter-spacing:.12em; }
.overlay-panel p { color:#b8c8d9; font-size:18px; }
.result-actions { display:flex; align-items:center; gap:12px; }

.mobile-controls { display:none; grid-template-columns:1fr 1fr; gap:12px; margin-top:14px; }
.touch-zone { display:grid; grid-template-columns:1fr auto 1fr; align-items:center; gap:8px; padding:10px; border-radius:16px; border:1px solid var(--line); background:rgba(255,255,255,.04); }
.touch-zone button { height:48px; border:1px solid rgba(255,255,255,.12); border-radius:12px; color:white; background:rgba(255,255,255,.07); }
.touch-zone span { font-family:"Orbitron"; font-size:11px; letter-spacing:.1em; }
.ice-zone { box-shadow:inset 0 0 20px rgba(27,154,255,.08); }
.fire-zone { box-shadow:inset 0 0 20px rgba(255,75,32,.08); }

@media (max-width: 760px) {
  .app-shell { width:min(100% - 18px, 1180px); }
  .topbar { height:68px; }
  .home-screen { padding-top:28px; }
  .home-grid, .control-panel { grid-template-columns:1fr; }
  .hero-description { font-size:16px; }
  .mode-card { min-height:110px; }
  .quick-guide { display:none; }
  .game-heading { align-items:center; }
  .game-heading .eyebrow { display:none; }
  .game-heading h2 { font-size:18px; }
  .scoreboard { grid-template-columns:1fr .9fr 1fr; }
  .score-side { min-height:63px; gap:8px; }
  .score-side strong { font-size:31px; }
  .score-side small { font-size:10px; }
  .mobile-controls { display:grid; }
  .canvas-wrap { padding:5px; border-radius:19px; }
  canvas { border-radius:14px; }
  .overlay-panel { inset:5px; }
}

@media (max-width: 480px) {
  .brand strong { font-size:12px; }
  h1 { font-size:38px; }
  .game-actions .small-btn { padding:0 10px; font-size:12px; }
  .mobile-controls { grid-template-columns:1fr; }
  .primary-btn { width:100%; min-width:0; }
}