/* The Keeper and the Beacon - deck styles. Dark theater around real
   gameplay screenshots; the motion comes from the kb-a/kb-b Ken Burns
   keyframes the player toggles per screenshot. */

* {
  box-sizing: border-box;
  margin: 0;
}

:root {
  --bg: #0b1020;
  --panel: #121a30;
  --panel-2: #0e1526;
  --ink: #e8ecf8;
  --muted: #93a0c0;
  --accent: #f0a834;
  --accent-2: #4f83e0;
  --line: #223052;
}

html,
body {
  height: 100%;
}

body {
  background: radial-gradient(1200px 700px at 70% -10%, #17224066, transparent),
    var(--bg);
  color: var(--ink);
  font-family: 'Segoe UI', system-ui, sans-serif;
  overflow: hidden;
}

.shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  grid-template-rows: 1fr auto;
  height: 100vh;
}

/* ---- chapter rail ---- */

.rail {
  grid-row: 1 / 3;
  background: var(--panel-2);
  border-right: 1px solid var(--line);
  padding: 22px 16px;
  overflow-y: auto;
}

.rail-title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 18px;
}

.rail-title span {
  display: block;
  color: var(--accent);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 4px;
}

.chapters {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chapters button {
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  color: var(--muted);
  font: inherit;
  font-size: 0.85rem;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  gap: 10px;
  align-items: baseline;
}

.chapters button:hover {
  background: #1a2440;
  color: var(--ink);
}

.chapters .num {
  color: var(--accent-2);
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
}

.chapters li.active button {
  background: #1d2a4d;
  color: var(--ink);
  box-shadow: inset 2px 0 0 var(--accent);
}

/* ---- stage ---- */

.main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 22px 28px 0;
  gap: 14px;
}

.slide-head #slide-eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 600;
}

.slide-head #slide-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-top: 2px;
}

.stage {
  position: relative;
  flex: 1;
  min-height: 0;
  border-radius: 14px;
  overflow: hidden;
  background: #000;
  border: 1px solid var(--line);
  box-shadow: 0 20px 60px #00000088;
}

.layer {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.9s ease;
}

.layer img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

.layer.active {
  opacity: 1;
}

/* The literal keyframes: slow drift + zoom, two directions. Only the
   active layer animates; 26s outlasts any single keyframe's screen time
   so the motion never visibly loops. */

.layer.kb-a img {
  animation: kb-a 26s ease-out forwards;
}

.layer.kb-b img {
  animation: kb-b 26s ease-out forwards;
}

@keyframes kb-a {
  from {
    transform: scale(1) translate(0, 0);
  }
  to {
    transform: scale(1.08) translate(-1.5%, -2.5%);
  }
}

@keyframes kb-b {
  from {
    transform: scale(1.06) translate(1.2%, -1%);
  }
  to {
    transform: scale(1) translate(0, 0);
  }
}

.caption {
  position: relative;
  min-height: 34px;
  color: var(--muted);
  font-size: 0.95rem;
  font-style: italic;
  padding: 2px 4px 10px;
}

.caption.pop {
  animation: cap-in 0.6s ease both;
}

@keyframes cap-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---- transport ---- */

.transport {
  grid-column: 2;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 28px 18px;
}

.control {
  background: #1a2440;
  border: 1px solid var(--line);
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
}

.control:hover {
  background: #223055;
}

.control.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #1c1400;
  font-weight: 700;
  min-width: 88px;
}

.scrub {
  flex: 1;
  height: 8px;
  background: #1a2440;
  border-radius: 999px;
  cursor: pointer;
  overflow: hidden;
}

.scrub-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  border-radius: 999px;
}

.time {
  color: var(--muted);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  min-width: 92px;
  text-align: right;
}

.hint {
  color: #5a688c;
  font-size: 0.72rem;
}

/* ---- small screens: the deck stacks and the page scrolls ---- */

.rail-back {
  display: block;
  color: var(--accent-2);
  text-decoration: none;
  font-size: 0.78rem;
  margin-bottom: 14px;
}

.rail-back:hover {
  text-decoration: underline;
}

@media (max-width: 900px) {
  body {
    overflow: auto;
  }

  .shell {
    display: flex;
    flex-direction: column;
    height: auto;
    min-height: 100vh;
  }

  .rail {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 16px;
  }

  .chapters {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }

  .chapters button {
    width: auto;
    padding: 6px 10px;
    border: 1px solid var(--line);
  }

  .main {
    padding: 16px 14px 0;
  }

  .stage {
    flex: none;
    aspect-ratio: 16 / 10;
  }

  .transport {
    flex-wrap: wrap;
    padding: 12px 14px 20px;
  }

  .time {
    min-width: 0;
  }

  .hint {
    display: none;
  }
}