/* DART documentation — site-local styling.
 *
 * Two concerns live here:
 *   1. The DART 7 / DART 6 version notice banner shown on every page of the
 *      "latest" (DART 7) build. The template lives in
 *      ``_templates/layout.html``; this file owns its appearance.
 *   2. The DART 7 User Guide landing-page card grid. The markup lives in
 *      ``user_guide/index.md`` as a small block of HTML; this file owns its
 *      look so the guide reads as a guided walkthrough rather than a bare
 *      table of contents.
 *
 * Colors derive from the DART logo (warm amber + slate) so the site keeps its
 * own identity instead of mirroring any other project's documentation theme.
 */

:root {
  --dart-amber: #e8821e;
  --dart-amber-soft: #fbe6d2;
  --dart-amber-line: #f3c48a;
  --dart-slate: #2b3440;
  --dart-slate-soft: #5a6675;
  --dart-ink: #1f2730;
  --dart-card-bg: #ffffff;
  --dart-card-border: #e4e8ee;
}

/* --------------------------------------------------------------------------
 * Version notice banner (DART 7 vs DART 6 LTS)
 * ------------------------------------------------------------------------ */

.dart-version-banner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 0 0 1.5rem 0;
  padding: 0.7rem 1rem;
  border: 1px solid var(--dart-amber-line);
  border-left: 4px solid var(--dart-amber);
  border-radius: 6px;
  background: var(--dart-amber-soft);
  color: var(--dart-ink);
  font-size: 0.92rem;
  line-height: 1.45;
}

.dart-version-banner__badge {
  flex: 0 0 auto;
  align-self: flex-start;
  display: inline-block;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--dart-amber);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.dart-version-banner__text {
  flex: 1 1 16rem;
  min-width: 0;
}

.dart-version-banner a {
  color: #b5610a;
  font-weight: 600;
  text-decoration: underline;
}

.dart-version-banner a:hover {
  color: #8f4c06;
}

/* --------------------------------------------------------------------------
 * User Guide landing-page card grid
 * ------------------------------------------------------------------------ */

.ug-hero {
  margin: 0 0 1.75rem 0;
  padding: 1.4rem 1.5rem;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--dart-slate) 0%, #3b4858 100%);
  color: #f4f6f8;
}

.ug-hero__kicker {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dart-amber-line);
}

.ug-hero h2,
.ug-hero p:first-of-type {
  margin-top: 0;
}

.ug-hero p {
  margin-bottom: 0;
  color: #d6dce3;
  font-size: 0.98rem;
}

.ug-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15.5rem, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2rem 0;
}

.ug-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.1rem 1.15rem 1.2rem;
  border: 1px solid #e4e8ee;
  border-radius: 9px;
  background: var(--dart-card-bg);
  overflow: hidden;
  transition: transform 0.12s ease, box-shadow 0.12s ease,
    border-color 0.12s ease;
}

.ug-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--dart-amber);
}

.ug-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(43, 52, 64, 0.12);
  border-color: var(--dart-amber-line);
}

.ug-card__step {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dart-amber);
}

.ug-card__title {
  margin: 0.3rem 0 0.4rem 0;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--dart-slate);
}

.ug-card__title a {
  color: inherit;
  text-decoration: none;
}

.ug-card__title a:hover {
  color: var(--dart-amber);
}

.ug-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--dart-slate-soft);
}

.ug-card__links {
  margin-top: 0.7rem;
  font-size: 0.86rem;
}

.ug-card__links a {
  font-weight: 600;
}

/* Make the whole card clickable when it wraps a single primary link. */
.ug-card--linked a.ug-card__cover {
  position: absolute;
  inset: 0;
  z-index: 1;
  text-indent: -9999px;
}

@media (max-width: 480px) {
  .ug-card-grid {
    grid-template-columns: 1fr;
  }
}