:root {
  --bg: #0f1117;
  --card: #1a1d27;
  --border: #2e3148;
  --muted: #9ca3af;
  --accent: #3b82f6;
  --accent-2: #10b981;
  --danger: #ef4444;
  --radius: 12px;
  --shadow: 0 6px 20px rgba(0,0,0,0.35);
  --text: #e5e7eb;
  --input-bg: #252837;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

.container{
  max-width:980px;
  margin:32px auto;
  padding:20px;
}

.header{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.header-left{display:flex;flex-direction:column}
.header h1{margin:0;font-size:30px}
.tagline{margin:6px 0 0;color:var(--muted);font-size:14px}

@media (max-width:640px){
  .header{flex-direction:column;align-items:center;gap:8px}
}

/* Segmented control */
.segmented{display:inline-flex;border-radius:8px;overflow:hidden;border:1px solid var(--border);margin-right:12px}
.seg-btn{background:var(--input-bg);border:0;padding:8px 12px;cursor:pointer;font-size:13px;color:var(--text)}
.seg-btn:not(:last-child){border-right:1px solid var(--border)}
.seg-btn.active{background:var(--accent);color:#fff}
.seg-btn:focus{outline:2px solid rgba(59,130,246,0.3);outline-offset:2px}

/* CARD */
.card{
  background:var(--card);
  border-radius:var(--radius);
  padding:18px;
  margin:18px 0;
  box-shadow:var(--shadow);
  border:1px solid var(--border);
}

/* DROP ZONE */
.drop-zone{
  position:relative;
  height:380px;
  border-radius:10px;
  border:2px dashed var(--border);
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--muted);
  background:rgba(255,255,255,0.02);
  cursor:pointer;
  transition:all 150ms ease;
}
.drop-zone.dragover{
  border-color:var(--accent);
  background:rgba(59,130,246,0.06);
}
.drop-text{pointer-events:none}

/* Canvas styling */
#original-canvas{
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  display:none;
  object-fit:contain;
  border-radius:8px;
}

#drop-zone{
  background-color:rgba(255,255,255,0.02);
}

/* CONTROLS */
.controls-row{
  display:flex;
  gap:16px;
  align-items:center;
  flex-wrap:wrap;
  margin-top:12px;
}
.control-group{display:flex;gap:12px;align-items:center}
.control-group.small{margin-left:auto;align-items:center}

.btn{
  background:var(--input-bg);
  border:1px solid var(--border);
  padding:10px 14px;
  border-radius:8px;
  cursor:pointer;
  font-size:14px;
  color:var(--text);
  transition:all 120ms ease;
  box-shadow:0 1px 0 rgba(0,0,0,0.15);
}
.btn:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,0.3)}
.btn.primary{background:var(--accent);color:white;border-color:transparent}
.btn.secondary{background:var(--input-bg);border-color:var(--border)}
.btn:disabled{opacity:0.4;cursor:not-allowed;transform:none;box-shadow:none}

/* PREVIEW AREA */
.preview-container{
  display:flex;
  gap:16px;
  margin-top:12px;
  flex-wrap:wrap;
  justify-content:center;
  align-items:center;
  min-height:200px;
  padding:20px;
  border:2px dashed var(--border);
  border-radius:10px;
  background:rgba(255,255,255,0.02);
  position:relative;
}

.preview-canvas{
  max-width:100%;
  max-height:500px;
  border:1px solid var(--border);
  border-radius:8px;
  object-fit:contain;
}

.overlay-canvas{
  position:absolute;
  top:0;
  left:0;
  pointer-events:none;
  border-radius:8px;
  z-index:50;
}

/* Slice panel */
.slice-panel{
  position:fixed;
  right:20px;
  top:120px;
  width:300px;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:10px;
  padding:12px;
  box-shadow:0 8px 24px rgba(0,0,0,0.5);
  z-index:60;
}
.slice-panel h3{margin:0 0 8px 0;font-size:16px;color:var(--text)}
.slice-panel .slice-modes{display:flex;gap:8px;margin-bottom:8px}
.slice-panel .seg-btn.small{padding:6px 8px;font-size:12px}
.slice-panel label{display:block;font-size:13px;margin:6px 0;color:var(--text)}
.slice-panel input[type=number]{
  width:100%;
  padding:6px;
  border-radius:6px;
  border:1px solid var(--border);
  background:var(--input-bg);
  color:var(--text);
}
.slice-panel .slice-actions{display:flex;gap:8px;margin-top:8px}
.slice-panel .btn.small{padding:6px 8px;font-size:12px}
.slice-mode-panel{display:block}
.preview-info{font-size:12px;color:var(--muted);margin-bottom:8px}

.slices-container{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  justify-content:center;
  padding:12px;
}

.slice-item{
  border:1px solid var(--border);
  border-radius:6px;
  padding:4px;
  background:var(--input-bg);
}

.slice-item canvas{
  display:block;
  max-width:120px;
  max-height:120px;
}

/* TOLERANCE CONTROL */
.tolerance-control {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 160px;
}

.tolerance-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--muted);
}

.tolerance-row strong {
  color: var(--text);
  min-width: 24px;
  text-align: right;
}

.tolerance-slider {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ANIMATION PLAYER */
.anim-player {
  width: 100%;
  flex: 0 0 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 12px 0 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.anim-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 4px;
}

.anim-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.anim-frame-counter {
  font-size: 12px;
  color: var(--muted);
}

.anim-canvas-wrap {
  background-color: #111318;
  background-image:
    linear-gradient(45deg, #1e212b 25%, transparent 25%),
    linear-gradient(-45deg, #1e212b 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1e212b 75%),
    linear-gradient(-45deg, transparent 75%, #1e212b 75%);
  background-size: 14px 14px;
  background-position: 0 0, 0 7px, 7px -7px, -7px 0px;
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 80px;
  min-height: 80px;
}

#anim-canvas {
  display: block;
  max-width: 320px;
  max-height: 320px;
  width: auto;
  height: auto;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.anim-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.anim-fps-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
  margin-left: 4px;
}

.anim-fps-slider {
  width: 80px;
  accent-color: var(--accent);
  cursor: pointer;
}

.btn.small {
  padding: 6px 10px;
  font-size: 13px;
}

/* HINT TEXT */
.hint,.export-note{
  font-size:13px;
  color:var(--muted);
  margin-top:10px;
  display:block;
}

/* EXPORT FORMAT SELECTOR */
.export-format-group{
  display:flex;
  align-items:center;
  gap:8px;
}
.export-format-label{
  font-size:13px;
  color:var(--muted);
  white-space:nowrap;
}
.export-select{
  background:var(--input-bg);
  border:1px solid var(--border);
  color:var(--text);
  padding:6px 10px;
  border-radius:6px;
  font-size:13px;
  cursor:pointer;
  outline:none;
}
.export-select:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 2px rgba(59,130,246,0.25);
}

/* FOOTER */
.footer{
  text-align:center;
  margin-top:32px;
  padding-top:16px;
  border-top:1px solid var(--border);
  color:var(--muted);
  font-size:12px;
}

/* TOOLTIP */
.tool{
  position:relative;
  display:inline-block;
  margin:12px 0;
}

.info{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:20px;
  height:20px;
  border-radius:50%;
  background:var(--accent);
  color:white;
  font-size:12px;
  font-weight:700;
  margin-left:4px;
  cursor:help;
}

.tooltip{
  position:absolute;
  bottom:125%;
  left:50%;
  transform:translateX(-50%);
  background:#1e2130;
  color:var(--text);
  padding:8px 12px;
  border-radius:6px;
  font-size:12px;
  white-space:nowrap;
  opacity:0;
  pointer-events:none;
  transition:opacity 150ms ease;
  z-index:10;
  border:1px solid var(--border);
}

.tool:hover .tooltip{
  opacity:1;
}