:root {
  --bg: #040803;
  --panel: #1B3618;
  --panel-hover: #2C5828;
  --line: #6E6858;
  --text: #FDF6E5;
  --text-dim: #B5AE9C;
  --radius: 3px;
}

* {
  box-sizing: border-box;
}

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

body {
  padding: 64px 48px 96px;
  max-width: 1100px;
  margin: 0 auto;
}

@media (max-width: 640px) {
  body {
    padding: 40px 20px 72px;
  }
}

.intro {
  max-width: 620px;
  margin-bottom: 56px;
}

.intro h1 {
  font-family: "League Spartan", sans-serif;
  font-weight: 500;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.15;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

.intro p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-dim);
  margin: 0;
  max-width: 52ch;
}

/* ---------- Histogram ---------- */

.histogram-wrap {
  margin-bottom: 64px;
}

.histogram {
  display: flex;
  align-items: flex-end;
  height: 220px;
  gap: 1px;
  border-bottom: 1px solid var(--line);
  cursor: crosshair;
  position: relative;
}

.histogram-bar {
  flex: 1 1 0;
  min-width: 1px;
  border-radius: 1px 1px 0 0;
  transition: transform 120ms ease, filter 120ms ease;
  transform-origin: bottom;
}

.histogram:hover .histogram-bar {
  filter: brightness(0.85);
}

.histogram-bar:hover {
  filter: brightness(1.15) !important;
  transform: scaleY(1.03);
}

.histogram-bar.is-active {
  filter: brightness(1.25) !important;
  outline: 2px solid var(--text);
  outline-offset: -2px;
}

.histogram-axis {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 8px;
}

.click-marker {
  position: absolute;
  bottom: 0;
  width: 2px;
  height: 100%;
  background: var(--text);
  pointer-events: none;
  opacity: 0;
  transition: opacity 120ms ease, left 60ms ease;
}

.click-marker.is-visible {
  opacity: 0.9;
}

/* ---------- Mosaic ---------- */

.mosaic-wrap {
  margin-bottom: 32px;
}

.mosaic-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

#mosaic-status {
  font-size: 14px;
  color: var(--text-dim);
  margin: 0;
}

.reset-btn {
  background: none;
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  padding: 7px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease;
  white-space: nowrap;
}

.reset-btn:hover {
  border-color: var(--text-dim);
  background: var(--panel);
}

.mosaic {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.mosaic-item {
  background: var(--panel);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  transition: transform 150ms ease, border-color 150ms ease;
}

.mosaic-item:hover {
  transform: translateY(-2px);
  border-color: var(--text-dim);
}

.mosaic-item img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--bg);
}

.mosaic-item .meta {
  padding: 10px 12px 12px;
}

.mosaic-item .title {
  font-size: 13px;
  margin: 0 0 8px;
  color: var(--text);
}

.swatches {
  display: flex;
  gap: 4px;
}

.swatch {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
}

.empty-state {
  color: var(--text-dim);
  font-size: 14px;
  text-align: center;
  padding: 48px 0;
}

.empty-state code {
  background: var(--panel);
  padding: 2px 6px;
  border-radius: 3px;
}