/* =====================================================================
   Trail Life TX-1333 — Newsletter archive (news/index.html)
   A "trail through time": issues are stops along a winding dashed trail,
   newest at the top. Clicking a stop zooms into that point in time.
   ===================================================================== */

.trail-intro {
  max-width: 640px;
  margin: 0 auto var(--space-9);
  text-align: center;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--fs-body-lg);
  line-height: var(--lh-relaxed);
  color: var(--fg2);
}

/* ---------- The trail ------------------------------------------------ */
.trail-timeline {
  position: relative;
  max-width: 880px;
  margin: 0 auto;
  padding: var(--space-6) 0 var(--space-10);
}
/* Center dashed path, like a route drawn on a trail map */
.trail-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  border-left: 3px dashed var(--tl-brown);
  opacity: 0.45;
  transform: translateX(-50%);
}
/* Trailhead marker at the very top of the path */
.trail-timeline::after {
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  width: 14px;
  height: 14px;
  transform: translateX(-50%) rotate(45deg);
  background: var(--tl-red);
  border-radius: 3px;
}

/* ---------- Year markers --------------------------------------------- */
.trail-year {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  margin: var(--space-7) 0;
}
.trail-year span {
  font-family: var(--font-sans);
  font-weight: var(--fw-extrabold);
  font-size: var(--fs-caption);
  letter-spacing: 0.18em;
  color: var(--fg-on-dark);
  background: var(--tl-brown);
  padding: 6px 18px;
  border-radius: var(--r-pill);
  box-shadow: var(--shadow-1);
}

/* ---------- Stops ----------------------------------------------------- */
.trail-stop {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 56px 1fr;
  align-items: center;
  margin: var(--space-8) 0;
}
/* Trail blaze — the dot on the path */
.trail-stop__marker {
  grid-column: 2;
  justify-self: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--surface);
  border: 4px solid var(--tl-red);
  box-shadow: 0 0 0 4px var(--bg);
  z-index: 1;
}
/* Month label on the opposite side of the card */
.trail-stop__date {
  font-family: var(--font-sans);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: var(--fs-overline);
  color: var(--fg3);
}
.trail-stop--left  .trail-stop__date { grid-column: 3; grid-row: 1; justify-self: start; padding-left: var(--space-4); }
.trail-stop--right .trail-stop__date { grid-column: 1; grid-row: 1; justify-self: end; text-align: right; padding-right: var(--space-4); }

/* ---------- Issue cards ----------------------------------------------- */
.trail-card {
  grid-row: 1;
  display: block;
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-2);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.trail-stop--left  .trail-card { grid-column: 1; }
.trail-stop--right .trail-card { grid-column: 3; }
.trail-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-3);
}
.trail-card__cover {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  display: block;
}
.trail-card__body { padding: var(--space-5) var(--space-6) var(--space-6); }
.trail-card__title {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: var(--fw-bold);
  font-size: var(--fs-h4);
  line-height: var(--lh-snug);
  color: var(--fg1);
  margin: 0 0 var(--space-2);
}
.trail-card__teaser {
  font-family: var(--font-sans);
  font-size: var(--fs-body-sm);
  line-height: var(--lh-relaxed);
  color: var(--fg2);
  margin: 0 0 var(--space-4);
}
.trail-card__cta {
  font-family: var(--font-sans);
  font-weight: var(--fw-extrabold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: var(--fs-overline);
  color: var(--tl-red);
}

/* ---------- Zoom-into-time on click ----------------------------------- */
.trail-timeline.is-zooming .trail-stop,
.trail-timeline.is-zooming .trail-year { transition: opacity var(--dur-slow) var(--ease-out), filter var(--dur-slow) var(--ease-out); }
.trail-timeline.is-zooming .trail-stop:not(.zoom-target),
.trail-timeline.is-zooming .trail-year { opacity: 0.12; filter: blur(2px); }
.trail-timeline.is-zooming .zoom-target .trail-card {
  transform: scale(1.06);
  box-shadow: var(--shadow-4);
}

/* ---------- Empty state ----------------------------------------------- */
.trail-empty {
  text-align: center;
  color: var(--fg3);
  font-family: var(--font-sans);
  padding: var(--space-10) 0;
}

/* ---------- Mobile: single column, trail on the left ------------------ */
@media (max-width: 680px) {
  .trail-timeline::before { left: 18px; transform: none; }
  .trail-timeline::after  { left: 18px; transform: translateX(-50%) rotate(45deg); }
  .trail-year { justify-content: flex-start; }
  .trail-year span { margin-left: 40px; }
  .trail-stop { grid-template-columns: 36px 1fr; margin: var(--space-7) 0; }
  .trail-stop__marker { grid-column: 1; grid-row: 1; align-self: start; margin-top: 6px; }
  .trail-stop--left  .trail-stop__date,
  .trail-stop--right .trail-stop__date {
    grid-column: 2; grid-row: 1; justify-self: start; text-align: left;
    padding: 0 0 var(--space-2);
  }
  .trail-stop__date { position: relative; top: 4px; }
  .trail-stop--left  .trail-card,
  .trail-stop--right .trail-card { grid-column: 2; grid-row: 2; }
}

@media (prefers-reduced-motion: reduce) {
  .trail-card, .trail-timeline.is-zooming .trail-stop { transition: none; }
}