body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 10%, #08205f 0%, transparent 35%),
    radial-gradient(circle at 85% 0%, #1c3c9a 0%, transparent 30%),
    var(--color-bg-app);
  color: var(--color-text-primary);
  font-family: var(--font-family-base);
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-8);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.board-header {
  position: relative;
  border: var(--border-width-thick) solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  background:
    linear-gradient(180deg, var(--color-bg-board-top) 0%, #001a66 68%, #032780 100%);
  box-shadow: var(--shadow-board);
  animation: boardReveal 420ms ease-out both;
}

.board-headline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.board-headline-copy {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-right: auto;
}

.board-kicker {
  margin: 0;
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--font-size-xs);
}

.board-arrow-button {
  border: none;
  background: transparent;
  padding: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.board-arrow {
  width: 0;
  height: 0;
  border-left: 18px solid transparent;
  border-right: 18px solid transparent;
  border-top: 28px solid var(--color-text-highlight);
  filter: drop-shadow(0 0 8px rgba(255, 230, 0, 0.4));
}

.board-title {
  margin: 0;
  font-family: var(--font-family-board);
  font-size: var(--font-size-xl);
  color: var(--color-text-highlight);
  letter-spacing: 0.05em;
}

.board-subtitle {
  margin: var(--space-2) 0 0;
  color: var(--color-text-secondary);
}

.board-zone {
  margin: 0;
  color: var(--color-text-highlight);
  font-family: var(--font-family-board);
  font-size: clamp(1.4rem, 3.2vw, 2.4rem);
  letter-spacing: 0.03em;
}

@keyframes boardReveal {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 900px) {
  .app-shell {
    grid-template-columns: 2fr 1fr;
    align-items: start;
  }

  .board-header,
  .stop-search,
  .board-shell {
    grid-column: 1;
  }

  .line-detail-panel {
    grid-column: 2;
    grid-row: 3 / span 1;
    --line-detail-anchor-offset: 0px;
    margin-top: var(--line-detail-anchor-offset);
    transition: margin-top 180ms ease;
  }

  .license-note {
    grid-column: 1;
  }
}

@media (max-width: 680px) {
  .board-headline {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .board-zone {
    width: 100%;
  }
}