:root {
  color-scheme: dark;
  --bg: #080a0f;
  --panel: #111723;
  --panel-strong: #162033;
  --line: #2e3d57;
  --text: #eef4ff;
  --muted: #9caac0;
  --accent: #ff385c;
  --accent-2: #22d3ee;
  --gold: #ffd166;
  --green: #51e08a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 56, 92, 0.28), transparent 32rem),
    radial-gradient(circle at 85% 18%, rgba(34, 211, 238, 0.22), transparent 27rem),
    linear-gradient(135deg, #080a0f 0%, #0d1220 48%, #07090e 100%);
  color: var(--text);
}

.arena {
  width: min(1120px, calc(100vw - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 32px 0;
  display: grid;
  align-content: center;
  gap: 24px;
}

.hero {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
}

.eyebrow,
.tag,
.round-number,
.meta-row,
.round-card span {
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 800;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 5.8rem);
  line-height: 0.9;
}

.round-card {
  min-width: 164px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(17, 23, 35, 0.8);
  text-align: right;
}

.round-card span {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
}

.round-card strong {
  display: block;
  margin-top: 4px;
  color: var(--gold);
  font-size: 2rem;
}

.battle-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 18px;
}

.question-panel,
.answer-panel {
  min-height: 430px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(17, 23, 35, 0.86);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
}

.question-panel {
  padding: clamp(24px, 5vw, 46px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.question-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-top: 5px solid var(--accent);
  pointer-events: none;
}

.panel-topline,
.meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.tag {
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(255, 56, 92, 0.16);
  color: #ff8aa0;
  font-size: 0.76rem;
  font-weight: 800;
}

.round-number {
  color: var(--gold);
  font-size: 0.9rem;
  font-weight: 900;
}

h2 {
  margin: 54px 0;
  max-width: 820px;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.02;
}

.meta-row {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 800;
}

.answer-panel {
  padding: 22px;
  background:
    linear-gradient(180deg, rgba(22, 32, 51, 0.92), rgba(9, 13, 21, 0.92)),
    var(--panel-strong);
}

.answer-button {
  width: 100%;
  min-height: 58px;
  border: 0;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #ff7a18);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-size: 1.05rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  box-shadow: 0 12px 30px rgba(255, 56, 92, 0.28);
}

.answer-button:hover {
  filter: brightness(1.08);
}

.answer {
  margin-top: 22px;
  padding: 20px;
  border: 1px solid rgba(81, 224, 138, 0.34);
  border-radius: 8px;
  background: rgba(81, 224, 138, 0.08);
}

.answer.hidden {
  display: none;
}

.answer ul {
  margin: 0;
  padding-left: 22px;
}

.answer li {
  margin: 0 0 13px;
  color: #d9e7f7;
  line-height: 1.42;
}

.answer li::marker {
  color: var(--green);
}

@media (max-width: 800px) {
  .arena {
    width: min(100vw - 24px, 560px);
    padding: 20px 0;
    align-content: start;
  }

  .hero,
  .panel-topline,
  .meta-row {
    align-items: stretch;
    flex-direction: column;
  }

  .round-card {
    text-align: left;
  }

  .battle-grid {
    grid-template-columns: 1fr;
  }

  .question-panel,
  .answer-panel {
    min-height: auto;
  }

  h2 {
    margin: 36px 0;
  }
}