:root {
  --bg: #121013;
  --surface: #1c1a1d;
  --surface-raised: #242226;
  --line: #322f33;
  --amber: #E8A33D;
  --amber-dim: #B97F2C;
  --text: #ECE7E1;
  --text-muted: #948E8A;
  --font-display: 'Barlow Condensed', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- signature element: film sprocket strip --- */
.sprocket-strip {
  height: 14px;
  flex-shrink: 0;
  background-color: var(--surface);
  background-image: radial-gradient(circle, var(--bg) 3px, transparent 3.5px);
  background-size: 24px 14px;
  background-position: 12px center;
  border-block: 1px solid var(--line);
}

/* --- topbar --- */
.topbar {
  padding: 18px 28px 14px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-mark {
  color: var(--amber);
  font-size: 1.1rem;
}

.brand h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.6rem;
  letter-spacing: 0.02em;
  margin: 0;
}

.breadcrumb {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
}

.breadcrumb button {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 3px;
}

.breadcrumb button:hover,
.breadcrumb button:focus-visible {
  color: var(--amber);
  outline: 1px solid var(--amber-dim);
}

.breadcrumb .crumb-sep {
  color: var(--line);
}

.breadcrumb .current {
  color: var(--amber);
}

/* --- main / grid --- */
main {
  flex: 1;
  padding: 24px 28px 48px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.status {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 40px 0;
  text-align: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 4px;
}

.folder-card, .photo-frame {
  position: relative;
  cursor: pointer;
  border: none;
  background: var(--surface);
  padding: 0;
  color: inherit;
  font: inherit;
  text-align: left;
}

.folder-card {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 14px;
  border: 1px solid var(--line);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.folder-card:hover, .folder-card:focus-visible {
  border-color: var(--amber-dim);
  background: var(--surface-raised);
  outline: none;
}

.folder-icon {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--amber-dim);
  line-height: 1;
}

.folder-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  word-break: break-word;
}

.photo-frame {
  aspect-ratio: 1;
  overflow: hidden;
}

.photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.2s ease, filter 0.2s ease;
  background: var(--surface);
}

.photo-frame:hover img, .photo-frame:focus-visible img {
  transform: scale(1.04);
}

.photo-frame:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -2px;
}

.frame-number {
  position: absolute;
  bottom: 4px;
  right: 6px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--amber);
  background: rgba(18, 16, 19, 0.75);
  padding: 1px 5px;
  border-radius: 2px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.photo-frame:hover .frame-number,
.photo-frame:focus-visible .frame-number {
  opacity: 1;
}

/* --- lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(8, 7, 9, 0.96);
  z-index: 100;
  display: none;
  flex-direction: column;
}

.lightbox.is-open {
  display: flex;
}

.lightbox-sprocket {
  height: 14px;
  flex-shrink: 0;
  background-image: radial-gradient(circle, #08070a 3px, transparent 3.5px);
  background-size: 24px 14px;
  background-position: 12px center;
}

.lb-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  cursor: grab;
}

.lb-stage.zoomed { cursor: grab; }
.lb-stage.dragging { cursor: grabbing; }

.lb-stage img {
  max-width: 92vw;
  max-height: 80vh;
  object-fit: contain;
  user-select: none;
  transition: transform 0.15s ease;
  transform-origin: center center;
}

.lb-close, .lb-nav {
  position: absolute;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  font-size: 1.8rem;
  line-height: 1;
  padding: 10px;
  z-index: 5;
}

.lb-close:hover, .lb-nav:hover,
.lb-close:focus-visible, .lb-nav:focus-visible {
  color: var(--amber);
}

.lb-close { top: 20px; right: 20px; font-size: 2rem; }
.lb-prev { left: 10px; top: 50%; transform: translateY(-50%); font-size: 2.8rem; }
.lb-next { right: 10px; top: 50%; transform: translateY(-50%); font-size: 2.8rem; }

.lb-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 24px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.lb-frame { color: var(--amber); }

@media (max-width: 640px) {
  .topbar { padding: 14px 16px 12px; }
  main { padding: 16px 12px 32px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 3px; }
  .lb-prev, .lb-next { font-size: 2rem; padding: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}