:root {
  --ink: #172026;
  --muted: #5d6b74;
  --line: #d7e1e7;
  --panel: #ffffff;
  --teal: #0f8b8d;
  --blue: #3f6fd6;
  --shadow: 0 22px 60px rgba(23, 32, 38, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #f8fbfa 0%, #edf6f7 54%, #f8f2e6 100%);
}

.game-shell {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
  padding: 110px 0 44px;
}

.game-nav {
  margin-bottom: 18px;
}

.game-nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--teal);
  font-size: 0.9rem;
  font-weight: 800;
  text-decoration: none;
}

.game-stage {
  display: grid;
  grid-template-columns: minmax(280px, 0.88fr) minmax(300px, 1.12fr);
  gap: 22px;
}

.game-brief,
.play-board {
  min-height: 390px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
}

.game-brief {
  padding: clamp(24px, 5vw, 46px);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(2.4rem, 7vw, 5rem);
  line-height: 0.95;
}

.summary {
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.6;
}

.topic-pill {
  display: inline-flex;
  margin-top: 18px;
  padding: 8px 12px;
  border-radius: 999px;
  color: #24404a;
  font-size: 0.8rem;
  font-weight: 800;
  background: #e8f4f0;
}

.play-board {
  display: grid;
  place-items: center;
  overflow: hidden;
  padding: 28px;
  background:
    linear-gradient(rgba(16, 24, 29, 0.92), rgba(16, 24, 29, 0.92)),
    repeating-linear-gradient(90deg, transparent 0 34px, rgba(255, 255, 255, 0.08) 35px 36px),
    repeating-linear-gradient(0deg, transparent 0 34px, rgba(255, 255, 255, 0.08) 35px 36px);
}

.placeholder-card {
  width: min(430px, 100%);
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  color: #ecf7f2;
  background: rgba(255, 255, 255, 0.08);
}

.placeholder-card h2 {
  margin: 0 0 12px;
  font-size: 1.4rem;
}

.placeholder-card p {
  margin-bottom: 0;
  color: rgba(236, 247, 242, 0.72);
  line-height: 1.6;
}

@media (max-width: 820px) {
  .game-stage {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .game-shell {
    width: min(100% - 20px, 1040px);
    padding-top: 0;
  }
}