:root {
  --bg1: #0a1618;
  --bg2: #11313a;
  --panel: #10272f;
  --accent: #ffb703;
  --accent2: #7ee8fa;
  --edge: #9fdc9f;
  --text: #edf6f9;
  --muted: #9fb6bc;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 15% 20%, #1f4f5a, transparent 35%),
              radial-gradient(circle at 80% 0%, #5d3c1d, transparent 32%),
              linear-gradient(140deg, var(--bg1), var(--bg2));
  min-height: 100vh;
}

.app-shell {
  max-width: 760px;
  margin: 2rem auto 1rem;
  padding: 0 1rem;
}

.panel {
  background: color-mix(in oklab, var(--panel), black 18%);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 16px;
  padding: 1.25rem;
  backdrop-filter: blur(8px);
}

.hidden { display: none; }

h1 { margin-top: 0; letter-spacing: 0.03em; }
h2 { margin: 0.5rem 0; letter-spacing: 0.02em; }
.sub { color: var(--muted); }
.fine { color: var(--muted); font-size: 0.85rem; }

.s-heads { color: var(--accent); font-weight: 700; }
.s-tails { color: var(--accent2); font-weight: 700; }
.s-edge  { color: var(--edge);  font-weight: 700; }

.grid-two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 0.75rem 0;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.92rem;
}

input {
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(8, 20, 25, 0.72);
  color: var(--text);
  border-radius: 10px;
  padding: 0.6rem 0.7rem;
}

.rules {
  background: rgba(3, 10, 14, 0.6);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 0.25rem 0.9rem;
  margin: 0.75rem 0;
}

.controls { display: flex; gap: 0.6rem; margin: 1rem 0 0.25rem; }
.controls.center { justify-content: center; }

button {
  border: 0;
  border-radius: 999px;
  padding: 0.65rem 1.2rem;
  cursor: pointer;
  background: linear-gradient(90deg, var(--accent), #fb8500);
  color: #1d1005;
  font-weight: 700;
  font-size: 1rem;
}
button:active { transform: translateY(1px); }

.flip-note { min-height: 1.4rem; color: var(--accent2); font-weight: 600; }

/* mode toggle */
.mode-row { display: flex; gap: 0.6rem; margin: 0.75rem 0 0.25rem; flex-wrap: wrap; }
.mode-btn {
  background: rgba(8, 20, 25, 0.72);
  color: var(--muted);
  border: 1px solid rgba(255,255,255,0.2);
  font-weight: 600;
}
.mode-btn.active {
  background: linear-gradient(90deg, var(--accent), #fb8500);
  color: #1d1005;
  border-color: transparent;
  font-weight: 700;
}

/* curtain */
.screen#screen-curtain { text-align: center; }
.device-mock.small {
  width: 130px;
  aspect-ratio: 1;
  margin: 0.5rem auto;
  position: relative;
  display: grid;
  place-items: center;
}
.ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 7px solid rgba(126, 232, 250, 0.4);
  box-shadow: 0 0 25px rgba(126,232,250,0.2), inset 0 0 20px rgba(255,183,3,0.18);
  animation: ringPulse 2.4s ease-in-out infinite;
}
@media (prefers-reduced-motion: reduce) {
  .ring { animation: none; }
}
@keyframes ringPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
.core {
  width: 52%;
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  font-weight: 900;
  color: #fff8e5;
  background: radial-gradient(circle at 35% 35%, #ffcf71, #bb6b1a 65%, #6d3507);
  box-shadow: 0 8px 28px rgba(0,0,0,0.42);
}

/* play */
.table-row { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.9rem; }
.score b { color: var(--text); }
.led-area { min-height: 0; margin: 0.5rem 0; display: flex; gap: 0.75rem; align-items: center; }
.led-label { color: var(--muted); font-size: 0.85rem; }

.hand {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0.75rem 0;
}

.card {
  width: 74px;
  height: 104px;
  border-radius: 12px;
  border: 2px solid;
  background: rgba(3, 10, 14, 0.72);
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 0.4rem 0.5rem;
  cursor: pointer;
  color: var(--text);
  font-family: inherit;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.card .rank { font-size: 1.5rem; font-weight: 900; text-align: left; }
.card .pip  { font-size: 1.6rem; text-align: center; align-self: center; }
.card .suit { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em; text-align: center; }

.card.heads { border-color: var(--accent);  }
.card.tails { border-color: var(--accent2); }
.card.edge  { border-color: var(--edge);    }
.card.heads .pip, .card.heads .suit { color: var(--accent); }
.card.tails .pip, .card.tails .suit { color: var(--accent2); }
.card.edge  .pip, .card.edge  .suit { color: var(--edge); }

.card:enabled:hover { transform: translateY(-4px); box-shadow: 0 10px 22px rgba(0,0,0,0.45); }
.card:disabled { opacity: 0.35; cursor: not-allowed; }

.card.static { cursor: default; }

.table-cards { display: flex; gap: 1rem; margin: 0.75rem 0; align-items: center; }
.vs { color: var(--muted); font-weight: 700; }
.owner { font-size: 0.8rem; color: var(--muted); text-align: center; margin-top: 0.3rem; }

.score.big { font-size: 1.1rem; margin: 0.5rem 0; }
.winner-glow { box-shadow: 0 0 18px rgba(255, 183, 3, 0.55); }

footer { text-align: center; padding: 1rem; color: #d7e4e7; }
footer a { color: inherit; }

@media (max-width: 520px) {
  .grid-two { grid-template-columns: 1fr; }
  .card { width: 64px; height: 92px; }
}