:root {
  color-scheme: dark;
  --bg: #07111f;
  --panel: rgba(12, 24, 44, 0.86);
  --panel-strong: rgba(17, 33, 59, 0.96);
  --line: rgba(148, 163, 184, 0.2);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #8b5cf6;
  --accent-2: #22d3ee;
  --warn: #fb7185;
  --good: #4ade80;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top right, rgba(34, 211, 238, 0.2), transparent 28%),
    linear-gradient(180deg, #08111d, #0d1729 58%, #09111d 100%);
  color: var(--text);
  font-family: Inter, system-ui, sans-serif;
}

button,
canvas {
  appearance: none;
}

.shell {
  width: min(1260px, calc(100% - 24px));
  margin: 0 auto;
  padding: 24px 0 36px;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(14, 27, 52, 0.96), rgba(11, 20, 38, 0.86));
  box-shadow: 0 24px 80px rgba(8, 15, 30, 0.38);
}

.eyebrow {
  margin: 0 0 10px;
  color: #93c5fd;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 0.72rem;
  font-weight: 700;
}

h1, h2, p {
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1;
}

.summary {
  margin-top: 12px;
  max-width: 720px;
  color: var(--muted);
  line-height: 1.7;
}

.hero-actions,
.spell-list,
.upgrade-list {
  display: grid;
  gap: 10px;
}

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

button {
  border: 1px solid rgba(139, 92, 246, 0.35);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.94), rgba(15, 23, 42, 0.94));
  color: var(--text);
  font: inherit;
  font-weight: 700;
  padding: 12px 14px;
  cursor: pointer;
  box-shadow: 0 12px 32px rgba(4, 10, 24, 0.32);
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  border-color: rgba(34, 211, 238, 0.45);
  background: linear-gradient(180deg, rgba(37, 50, 74, 0.98), rgba(17, 28, 46, 0.98));
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.hud {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.stat,
.panel {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.stat {
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
}

.stat span,
.panel-note {
  color: var(--muted);
}

.battle-wrap {
  margin-top: 16px;
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(290px, 0.75fr);
  gap: 16px;
}

#battlefield {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 24px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #101e35, #0b1525);
  box-shadow: 0 24px 70px rgba(2, 10, 22, 0.42);
}

.sidepanel {
  display: grid;
  gap: 14px;
}

.panel {
  padding: 18px;
}

.panel h2 {
  margin-bottom: 12px;
  font-size: 1rem;
}

.spell-list button,
.upgrade-list button {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  width: 100%;
}

.spell-list span,
.upgrade-list span {
  color: #c4b5fd;
  font-size: 0.85rem;
}

#message {
  min-height: 72px;
  line-height: 1.7;
}

.tips {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.tips > div {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(9, 18, 33, 0.85);
}

.tips h2 {
  margin-bottom: 10px;
  font-size: 1rem;
}

.tips p {
  color: var(--muted);
  line-height: 1.7;
}

@media (max-width: 980px) {
  .hero,
  .battle-wrap,
  .tips {
    grid-template-columns: 1fr;
    display: grid;
  }

  .hero {
    align-items: stretch;
  }

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

@media (max-width: 640px) {
  .shell {
    width: min(100% - 14px, 1260px);
    padding-top: 14px;
  }

  .hero,
  .panel,
  .tips > div {
    border-radius: 18px;
  }

  .hero-actions,
  .hud,
  .tips {
    grid-template-columns: 1fr;
  }

  button {
    padding: 13px 14px;
  }
}