:root {
  --wood-dark: #3d2415;
  --wood-mid: #845735;
  --wood-light: #d8bb8b;
  --wood-cream: #f5ebd7;
  --ink-soft: #2a1a11;
  --gold-soft: #c59d5f;
  --success-soft: #365c36;
  --danger-soft: #7f3427;
  --shadow-soft: 0 24px 70px rgba(30, 17, 9, 0.22);
}

html {
  font-size: 16px;
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink-soft);
  background:
    radial-gradient(circle at top left, rgba(255, 244, 217, 0.65), transparent 28%),
    radial-gradient(circle at bottom right, rgba(90, 48, 22, 0.28), transparent 34%),
    linear-gradient(135deg, #5b351e 0%, #9b6a3e 40%, #4c2f1c 100%);
}

.page-shell {
  min-height: 100vh;
  padding: 1.2rem 0 2rem;
}

.topbar {
  margin-bottom: 1.5rem;
}

.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border: 1px solid rgba(255, 239, 210, 0.2);
  border-radius: 1.4rem;
  background: rgba(46, 28, 17, 0.72);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-soft);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  color: #fff8ea;
  text-decoration: none;
}

.brand-mark:hover {
  color: #fff8ea;
}

.brand-mark strong,
.brand-mark small {
  display: block;
}

.brand-mark small {
  color: rgba(255, 239, 210, 0.76);
}

.brand-mark__badge {
  display: inline-grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 0.95rem;
  background: linear-gradient(135deg, #f0d39e, #bb8d53);
  color: var(--wood-dark);
  font-weight: 800;
  letter-spacing: 0.05em;
}

.topbar__action {
  border-color: rgba(255, 239, 210, 0.55);
  color: #fff8ea;
}

.topbar__action:hover {
  background: rgba(255, 248, 234, 0.12);
  color: #fff8ea;
}

.chess-stage {
  position: relative;
  overflow: hidden;
  padding: 2rem;
  border-radius: 2rem;
  background: linear-gradient(180deg, rgba(247, 238, 222, 0.97), rgba(230, 209, 176, 0.93));
  box-shadow: var(--shadow-soft);
}

.chess-stage::before {
  content: "";
  position: absolute;
  inset: 1rem;
  border-radius: 1.4rem;
  border: 1px solid rgba(77, 42, 17, 0.12);
  pointer-events: none;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: rgba(91, 53, 30, 0.08);
  color: var(--wood-mid);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero-title {
  max-width: 12ch;
  margin: 1rem 0 0.75rem;
  font-size: clamp(2.2rem, 5vw, 4.6rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.hero-copy {
  max-width: 54ch;
  margin-bottom: 1.5rem;
  color: rgba(42, 26, 17, 0.78);
  font-size: 1.03rem;
}

.game-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 1.5rem;
}

.meta-chip {
  padding: 0.8rem 1rem;
  border-radius: 1rem;
  background: rgba(255, 248, 234, 0.7);
  border: 1px solid rgba(93, 56, 30, 0.12);
}

.meta-chip span {
  display: block;
  font-size: 0.8rem;
  color: rgba(42, 26, 17, 0.65);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.meta-chip strong,
.meta-chip code {
  font-size: 0.98rem;
}

.move-form {
  padding: 1.15rem;
  border-radius: 1.4rem;
  background: rgba(255, 252, 245, 0.72);
  border: 1px solid rgba(91, 53, 30, 0.12);
}

.move-form label {
  font-weight: 700;
  margin-bottom: 0.45rem;
}

.move-form .form-control {
  min-height: 3.6rem;
  border-radius: 1rem;
  border-color: rgba(93, 56, 30, 0.2);
  background: #fffdf7;
}

.move-form .form-control:focus {
  border-color: var(--gold-soft);
  box-shadow: 0 0 0 0.25rem rgba(197, 157, 95, 0.18);
}

.move-form .btn-primary {
  min-width: 12rem;
  border: none;
  border-radius: 1rem;
  background: linear-gradient(135deg, #5f351d, #9b6b3f);
}

.move-form .btn-primary:hover {
  background: linear-gradient(135deg, #4b2915, #85552f);
}

.robot-panel,
.history-panel {
  height: 100%;
  padding: 1.25rem;
  border-radius: 1.35rem;
  background: rgba(69, 40, 22, 0.92);
  color: #fff6e8;
}

.robot-panel code,
.history-panel code,
.meta-chip code {
  color: inherit;
  font-size: 0.95rem;
}

.robot-panel pre {
  margin: 0;
  padding: 1rem;
  border-radius: 1rem;
  background: rgba(255, 248, 234, 0.08);
  color: #fff3dd;
  white-space: pre-wrap;
}

.history-list {
  display: grid;
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.history-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid rgba(255, 239, 210, 0.12);
}

.message-banner {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  border: 1px solid transparent;
}

.message-banner--success {
  background: rgba(54, 92, 54, 0.12);
  border-color: rgba(54, 92, 54, 0.18);
  color: var(--success-soft);
}

.message-banner--error {
  background: rgba(127, 52, 39, 0.1);
  border-color: rgba(127, 52, 39, 0.18);
  color: var(--danger-soft);
}

.fen-block {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  background: rgba(255, 248, 234, 0.75);
  border: 1px solid rgba(91, 53, 30, 0.12);
}

@media (max-width: 767.98px) {
  .page-shell {
    padding-top: 0.8rem;
  }

  .topbar__inner {
    flex-direction: column;
    align-items: stretch;
  }

  .chess-stage {
    padding: 1.2rem;
  }

  .hero-title {
    max-width: none;
  }

  .move-form .btn-primary {
    width: 100%;
  }
}