:root {
  --bg: #070a10;
  --panel: rgba(17, 23, 34, 0.78);
  --line: rgba(148, 163, 184, 0.16);
  --text: #edf2f7;
  --muted: #94a3b8;
  --host: #2dd4bf;
  --guest: #fb7185;
  --radius: 18px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { height: 100%; margin: 0; }

body {
  font-family: ui-sans-serif, -apple-system, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background:
    radial-gradient(60rem 40rem at 15% -10%, rgba(45, 212, 191, 0.13), transparent 65%),
    radial-gradient(60rem 40rem at 90% 110%, rgba(251, 113, 133, 0.12), transparent 65%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
}

#demo {
  position: fixed;
  top: 50%;
  left: 50%;
  width: max(100vw, 150vh);
  aspect-ratio: 3 / 2;
  transform: translate(-50%, -50%);
  opacity: 0.32;
  filter: saturate(1.1);
}

main {
  position: relative;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
}

.screen { width: 100%; animation: rise 320ms ease both; }

@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

.card {
  width: min(100%, 440px);
  margin: 0 auto;
  padding: 32px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.07),
    0 30px 80px rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(18px) saturate(1.3);
}

h1 {
  display: inline-block;
  margin: 0;
  font-size: clamp(2.8rem, 12vw, 4rem);
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1;
  background: linear-gradient(95deg, var(--host), #f8fafc 50%, var(--guest));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 22px rgba(45, 212, 191, 0.25));
}

h2 { margin: 0; font-size: 1.05rem; font-weight: 650; }

.tagline { margin: 12px 0 26px; color: var(--muted); line-height: 1.5; }

label {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

input {
  width: 100%;
  height: 48px;
  padding: 0 14px;
  color: var(--text);
  font: inherit;
  background: rgba(2, 6, 12, 0.55);
  border: 1px solid var(--line);
  border-radius: 12px;
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

input:focus {
  border-color: var(--host);
  box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.18);
}

.field { margin-bottom: 14px; }

button {
  height: 48px;
  padding: 0 18px;
  color: var(--text);
  font: inherit;
  font-weight: 650;
  background: rgba(148, 163, 184, 0.11);
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  transition: transform 120ms ease, background 150ms ease, opacity 150ms ease;
}

button:hover:not(:disabled) { background: rgba(148, 163, 184, 0.2); }
button:active:not(:disabled) { transform: scale(0.98); }
button:focus-visible { outline: 2px solid var(--host); outline-offset: 2px; }
button:disabled { opacity: 0.45; cursor: not-allowed; }

button.primary {
  color: #03130f;
  background: linear-gradient(135deg, #5eead4, var(--host));
  border-color: transparent;
  box-shadow: 0 8px 26px rgba(45, 212, 191, 0.24);
}

button.primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #99f6e4, #5eead4);
  box-shadow: 0 10px 32px rgba(45, 212, 191, 0.36);
}

button.small { height: 36px; padding: 0 12px; font-size: 0.86rem; border-radius: 10px; }

.stack { display: grid; gap: 10px; }
.row { display: grid; grid-template-columns: 1fr auto; gap: 10px; }

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.divider::before, .divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

#room-input { text-transform: uppercase; letter-spacing: 0.2em; font-family: ui-monospace, Menlo, monospace; }

.note { margin: 12px 0 0; color: var(--muted); font-size: 0.84rem; line-height: 1.45; }
.note.error { color: var(--guest); }

.leaderboard { margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--line); }
.leaderboard ol { margin: 10px 0 0; padding: 0; list-style: none; }
.leaderboard li {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.leaderboard li:first-child { color: var(--text); font-weight: 650; }

.code {
  margin: 18px 0;
  padding: 16px;
  font-family: ui-monospace, Menlo, monospace;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-align: center;
  background: rgba(2, 6, 12, 0.55);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.waiting { display: flex; align-items: center; gap: 10px; margin-top: 16px; color: var(--muted); font-size: 0.9rem; }

.pulse {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--host);
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  50% { opacity: 0.3; transform: scale(0.7); }
}

#play { width: min(100%, calc((100dvh - 120px) * 1.5), 1120px); margin: 0 auto; }

.hud {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.player { display: flex; align-items: center; gap: 9px; min-width: 0; font-weight: 650; }
.player.right { justify-content: flex-end; }
.player span:not(.dot) { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dot { flex: none; width: 10px; height: 10px; border-radius: 50%; }
.dot.host { background: var(--host); box-shadow: 0 0 12px var(--host); }
.dot.guest { background: var(--guest); box-shadow: 0 0 12px var(--guest); }

.score {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
  font-weight: 800;
}

#score-host { color: var(--host); }
#score-guest { color: var(--guest); }
.score .sep { color: var(--muted); opacity: 0.5; }

.arena {
  position: relative;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: var(--radius);
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.4),
    -40px 0 110px -40px rgba(45, 212, 191, 0.3),
    40px 0 110px -40px rgba(251, 113, 133, 0.3),
    0 30px 90px rgba(0, 0, 0, 0.55);
  touch-action: none;
}

canvas { display: block; width: 100%; height: 100%; }

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 16px;
  padding: 16px;
  text-align: center;
  background: rgba(7, 10, 16, 0.58);
  backdrop-filter: blur(5px);
  animation: fade 200ms ease both;
}

@keyframes fade { from { opacity: 0; } }

.overlay strong {
  font-size: clamp(2rem, 7vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  animation: pop 280ms cubic-bezier(0.2, 1.4, 0.4, 1) both;
}

.overlay strong.host { color: var(--host); text-shadow: 0 0 34px rgba(45, 212, 191, 0.55); }
.overlay strong.guest { color: var(--guest); text-shadow: 0 0 34px rgba(251, 113, 133, 0.55); }

@keyframes pop {
  from { opacity: 0; transform: scale(0.72); }
}
.overlay .actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }

.hint {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.84rem;
}

@media (max-width: 520px) {
  .card { padding: 24px 20px; }
  .hint { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}