:root {
  --bg: #100f12;
  --panel: #fff8f2;
  --ink: #211b1c;
  --muted: #74696a;
  --red: #d71920;
  --deep-red: #8f1016;
  --gold: #f0c56b;
  --line: rgba(33, 27, 28, 0.12);
  --shadow: 0 28px 80px rgba(80, 10, 14, 0.24);
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 18% 18%, rgba(215, 25, 32, 0.32), transparent 28%),
    radial-gradient(circle at 82% 8%, rgba(240, 197, 107, 0.22), transparent 24%),
    linear-gradient(145deg, #1a1114 0%, #3c0d12 52%, #150d10 100%);
}

button {
  font: inherit;
  cursor: pointer;
  border: 0;
}

.game-shell {
  width: min(1180px, calc(100vw - 28px));
  margin: 0 auto;
  padding: 22px 0 36px;
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 16px;
}

.hero-panel,
.game-panel {
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 248, 242, 0.94);
  box-shadow: var(--shadow);
}

.hero-panel {
  border-radius: 18px;
  padding: 22px;
  min-height: 600px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  color: #fff;
  background:
    linear-gradient(145deg, #ff3a3f, #a40f16),
    var(--red);
  text-decoration: none;
  font-size: 1.45rem;
  font-weight: 950;
  box-shadow: inset 0 2px 0 rgba(255,255,255,0.28), 0 14px 28px rgba(143,16,22,0.28);
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--deep-red);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  line-height: 1.02;
}

.intro {
  margin: 22px 0;
  color: var(--muted);
  line-height: 1.85;
  font-size: 1rem;
}

.hero-actions {
  display: grid;
  gap: 10px;
}

.primary-button,
.ghost-button {
  min-height: 48px;
  border-radius: 12px;
  font-weight: 900;
}

.primary-button {
  color: #fff;
  background: linear-gradient(135deg, #f8363f, #a90f16);
  box-shadow: 0 14px 30px rgba(169, 15, 22, 0.28);
}

.ghost-button {
  color: var(--deep-red);
  background: #fff;
  border: 1px solid var(--line);
}

.game-panel {
  border-radius: 18px;
  padding: 16px;
  min-width: 0;
}

.hud {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}

.hud-card {
  min-height: 70px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  display: grid;
  place-items: center;
  gap: 2px;
}

.hud-card span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.hud-card strong {
  font-size: clamp(1.25rem, 3vw, 1.9rem);
  line-height: 1;
}

.arena-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: 16px;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 50%, rgba(255,255,255,0.72), transparent 28%),
    linear-gradient(135deg, #fff7f1, #fffdf9);
  border: 1px solid var(--line);
}

#gameCanvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  padding: 20px;
  text-align: center;
  background: rgba(255, 248, 242, 0.78);
}

.overlay strong {
  font-size: clamp(1.25rem, 4vw, 2rem);
}

.overlay span {
  max-width: 430px;
  color: var(--muted);
  line-height: 1.7;
}

.overlay.is-hidden {
  display: none;
}

@media (max-width: 860px) {
  .game-shell {
    grid-template-columns: 1fr;
    padding-top: 12px;
  }

  .hero-panel {
    min-height: auto;
    gap: 16px;
  }

  .hud {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 460px) {
  .game-shell {
    width: min(100vw - 16px, 420px);
  }

  .hero-panel,
  .game-panel {
    border-radius: 14px;
  }

  .hero-panel {
    padding: 16px;
  }

  .game-panel {
    padding: 10px;
  }

  .brand-mark {
    width: 52px;
    height: 52px;
    border-radius: 14px;
  }

  .arena-wrap {
    aspect-ratio: 4 / 5;
  }
}