:root {
  --bg: #0b0d10;
  --bg-panel: #16191d;
  --bg-panel-2: #1e2227;
  --text: #e8e6df;
  --text-dim: #9a9da3;
  --accent: #f5b942;
  --accent-dim: #c9922c;
  --border: #2a2e34;
  --shadow: rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; }

.hidden { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  min-height: 100%;
}

/* subtle vignette + scanline texture on the page background for atmosphere */
body {
  background-image:
    radial-gradient(ellipse at 50% -10%, rgba(245, 185, 66, 0.06), transparent 60%),
    repeating-linear-gradient(0deg, rgba(255,255,255,0.015) 0px, rgba(255,255,255,0.015) 1px, transparent 1px, transparent 3px);
}

/* ---------- header ---------- */

.site-header {
  text-align: center;
  padding: 48px 16px 24px;
}

.sierra-logo {
  width: min(360px, 70vw);
  height: auto;
  filter: drop-shadow(0 0 18px rgba(245, 185, 66, 0.25));
}

.site-subtitle {
  margin: 14px 0 0;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

/* ---------- grid ---------- */

main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 22px 18px;
  justify-items: center;
}

.empty-msg {
  text-align: center;
  color: var(--text-dim);
  padding: 60px 20px;
}
.empty-msg code {
  background: var(--bg-panel);
  padding: 2px 6px;
  border-radius: 4px;
}

.tile {
  position: relative;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 100%;
  max-width: 190px;
  font-family: inherit;
}

.tile-thumb-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 200 / 209;
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-panel);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 4px 14px var(--shadow);
}

.tile:hover .tile-thumb-wrap,
.tile:focus-visible .tile-thumb-wrap {
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 10px 24px var(--shadow), 0 0 0 2px var(--accent-dim);
}

.tile-thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* pending: not yet downloaded -- greyed out and genuinely not clickable
   (rendered as a <div>, not a <button>, in app.js) */
.tile-pending {
  cursor: default;
}

.tile-pending .tile-thumb-wrap {
  box-shadow: none;
}

.tile-pending .tile-thumb-wrap img {
  filter: grayscale(1) brightness(0.55);
  opacity: 0.55;
}

.tile-pending .tile-title,
.tile-pending .tile-year {
  color: var(--text-dim);
  opacity: 0.6;
}

/* ---------- tile tooltip ---------- */

.tile-tooltip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translate(-50%, 4px);
  z-index: 5;
  min-width: max-content;
  max-width: 220px;
  padding: 7px 12px;
  border-radius: 8px;
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  box-shadow: 0 8px 20px var(--shadow);
  color: var(--text);
  font-size: 0.72rem;
  line-height: 1.4;
  text-align: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.tile-tooltip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--bg-panel-2);
}

.tile-tooltip .tile-tooltip-pct {
  color: var(--accent);
  font-weight: 600;
}

.tile:hover .tile-tooltip,
.tile:focus-visible .tile-tooltip {
  opacity: 1;
  transform: translate(-50%, 0);
}

.tile-caption {
  text-align: center;
  line-height: 1.25;
}

.tile-title {
  display: block;
  font-size: 0.82rem;
  color: var(--text);
}

.tile-year {
  display: block;
  font-size: 0.72rem;
  color: var(--accent-dim);
  letter-spacing: 0.04em;
}

/* ---------- overlay ---------- */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.overlay.hidden {
  display: none;
}

.overlay-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4, 5, 6, 0.86);
  backdrop-filter: blur(3px);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.overlay.open .overlay-backdrop {
  opacity: 1;
}

.overlay-panel {
  position: relative;
  z-index: 1;
  background: linear-gradient(180deg, var(--bg-panel-2), var(--bg-panel));
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px 76px 20px;
  max-width: 92vw;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: 0 24px 70px var(--shadow), 0 0 0 1px rgba(245, 185, 66, 0.08);
  transform-origin: center;
  /* base/closed transform + transition are set entirely via JS (app.js),
     which drives a multi-phase grow/shrink sequence -- see openOverlay()
     and closeOverlay() */
}

.overlay-image-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  max-height: 70vh;
  /* clip the sliding image during its translateX transition instead of
     showing scrollbars -- size is fixed per-session via inline style
     (see applyPixelScale in app.js) so this box never itself resizes */
  overflow: hidden;
  border-radius: 8px;
}

.overlay-image {
  display: block;
  /* pixel-perfect nearest-neighbor scaling, no pre-generated variants */
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
  border-radius: 6px;
  background: #000;
}

.overlay-close {
  position: absolute;
  top: 14px;
  right: 18px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.8rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
}
.overlay-close:hover { color: var(--text); }

.overlay-nav {
  position: absolute;
  top: 50%;
  z-index: 2;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, color 0.15s ease;
}
.overlay-nav:hover {
  background: var(--accent);
  color: #1a1305;
}
.overlay-prev { left: 16px; }
.overlay-next { right: 16px; }

.overlay-footer {
  margin-top: 18px;
  text-align: center;
}

.overlay-title {
  display: block;
  font-size: 1.05rem;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.overlay-count {
  display: block;
  margin-top: 4px;
  font-size: 0.78rem;
  color: var(--text-dim);
}

.overlay-source {
  display: block;
  margin-top: 4px;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-dim);
}

/* ---------- contributions ---------- */

.contributions {
  max-width: 780px;
  margin: 8px auto 40px;
  padding: 0 24px;
  text-align: center;
}

.contributions h2 {
  margin: 0 0 6px;
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.contributions-intro {
  margin: 0 0 16px;
  color: var(--text-dim);
  font-size: 0.78rem;
  line-height: 1.6;
}

.contributions-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.contributions-list li {
  color: var(--text-dim);
  font-size: 0.78rem;
}

.contributions-list strong {
  color: var(--text);
}

/* ---------- footer ---------- */

.site-footer {
  max-width: 780px;
  margin: 40px auto 60px;
  padding: 0 24px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.72rem;
  line-height: 1.6;
}

.site-footer p + p {
  margin-top: 10px;
}

.site-footer strong {
  color: var(--text);
}

@media (max-width: 640px) {
  .overlay-panel {
    padding: 22px 16px 16px;
    border-radius: 14px;
    max-width: 96vw;
  }
  .overlay-nav {
    width: 40px;
    height: 40px;
    font-size: 1.6rem;
  }
  .overlay-prev { left: 4px; }
  .overlay-next { right: 4px; }
}