:root {
  --bg-0: #16171d;
  --bg-1: #1d1f28;
  --bg-2: #262834;
  --line: #34374a;
  --text: #e7e7ee;
  --text-dim: #8d90a3;
  --accent: #5ee3a8;
  --accent-dim: #2f5f4c;
  --danger: #ef6a6a;
  --mono: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg-0);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ---------- topbar ---------- */

.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 10px 16px;
  background: var(--bg-1);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand-mark {
  color: var(--accent);
  font-size: 16px;
}

.sprite-controls, .export-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.dim-x { color: var(--text-dim); }

input[type="text"], input[type="number"], select {
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 4px;
  padding: 5px 8px;
  font-family: var(--mono);
  font-size: 12px;
}

input#sprite-id { width: 140px; }
input#sprite-w, input#sprite-h { width: 56px; }

.btn {
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 4px;
  padding: 6px 12px;
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  transition: border-color 0.12s ease, transform 0.05s ease;
}
.btn:hover { border-color: var(--accent); }
.btn:active { transform: translateY(1px); }

.btn-primary { border-color: var(--accent); color: var(--accent); }
.btn-accent { background: var(--accent); color: #0c1712; border-color: var(--accent); font-weight: 600; }
.btn-accent:hover { filter: brightness(1.08); }
.btn-danger { color: var(--danger); border-color: var(--danger); }

/* ---------- workspace ---------- */

.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: 190px 1fr 220px;
  min-height: 0;
}

.panel {
  background: var(--bg-1);
  border-right: 1px solid var(--line);
  padding: 14px;
  overflow-y: auto;
}
.panel.palette { border-right: none; border-left: 1px solid var(--line); }

.panel h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin: 18px 0 8px;
}
.panel h3:first-child { margin-top: 0; }

.tool-btn {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text);
  padding: 7px 8px;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  margin-bottom: 4px;
}
.tool-btn:hover { background: var(--bg-2); }
.tool-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 10px;
  cursor: pointer;
}

#zoom { width: 100%; }
#zoom-label { color: var(--text-dim); font-size: 11px; }

/* ---------- canvas area ---------- */

.canvas-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  overflow: auto;
  background:
    radial-gradient(circle at 50% 0%, #1c1e27 0%, var(--bg-0) 60%);
}

.canvas-wrap {
  position: relative;
  box-shadow: 0 0 0 1px var(--line), 0 12px 40px rgba(0,0,0,0.45);
  image-rendering: pixelated;
}

#checker, #reference, #sprite-canvas, #grid {
  position: absolute;
  top: 0;
  left: 0;
  image-rendering: pixelated;
}

#grid {
  pointer-events: none;
}

.statusbar {
  display: flex;
  gap: 18px;
  color: var(--text-dim);
  font-size: 11px;
}

/* ---------- palette ---------- */

.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

.swatch {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 4px;
  border: 1px solid var(--line);
  cursor: pointer;
  background-image:
    linear-gradient(45deg, #444 25%, transparent 25%),
    linear-gradient(-45deg, #444 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #444 75%),
    linear-gradient(-45deg, transparent 75%, #444 75%);
  background-size: 8px 8px;
  background-position: 0 0, 0 4px, 4px -4px, -4px 0;
}
.swatch::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 3px;
  background: var(--swatch-color, transparent);
}
.swatch.selected { outline: 2px solid var(--accent); outline-offset: 1px; }

.palette-add {
  display: flex;
  gap: 6px;
  margin-top: 10px;
}
.palette-add input[type="color"] {
  width: 34px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg-2);
}

.muted { color: var(--text-dim); font-weight: 400; }

.analyze-out {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 8px;
  font-size: 11px;
  color: var(--text-dim);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 260px;
  overflow-y: auto;
}

/* ---------- galeria (modal) ---------- */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 11, 15, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 24px;
}
.modal-overlay.hidden { display: none; }

.modal {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
  width: min(920px, 100%);
  max-height: min(720px, 90vh);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.modal-header h2 {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.02em;
}
.modal-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.modal-header-actions label.btn { cursor: pointer; }

.gallery-empty {
  padding: 40px 18px;
  text-align: center;
  color: var(--text-dim);
  font-size: 12px;
}
.gallery-empty.hidden { display: none; }

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 14px;
  padding: 18px;
  overflow-y: auto;
}

.gallery-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.12s ease;
}
.gallery-card:hover { border-color: var(--accent); }

.gallery-thumb {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 4px;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-image:
    linear-gradient(45deg, #444 25%, transparent 25%),
    linear-gradient(-45deg, #444 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #444 75%),
    linear-gradient(-45deg, transparent 75%, #444 75%);
  background-size: 10px 10px;
  background-position: 0 0, 0 5px, 5px -5px, -5px 0;
}
.gallery-thumb img {
  max-width: 92%;
  max-height: 92%;
  image-rendering: pixelated;
}

.gallery-card-id {
  font-size: 12px;
  font-weight: 600;
  word-break: break-all;
  line-height: 1.3;
}
.gallery-card-meta {
  font-size: 10px;
  color: var(--text-dim);
}
.gallery-card-actions {
  display: flex;
  gap: 6px;
  margin-top: auto;
}
.gallery-card-actions .btn {
  flex: 1;
  padding: 5px 6px;
  font-size: 11px;
  text-align: center;
}