:root {
  --bg: #0b0f14;
  --panel: #111722;
  --panel-2: #0f1520;
  --accent: #62f4c5;
  --accent-2: #2dd1d1;
  --text: #e8f1ff;
  --muted: #8ba2b5;
  --grid: rgba(255,255,255,0.08);
  --danger: #ff6b6b;
  --shadow: 0 18px 40px rgba(0,0,0,0.45);
  font-family: 'Space Grotesk', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(circle at 18% 20%, rgba(98,244,197,0.08), transparent 22%),
              radial-gradient(circle at 80% 0%, rgba(45,209,209,0.08), transparent 35%),
              var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  backdrop-filter: blur(8px);
}

.brand {
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--accent);
}

.top-actions button { margin-left: 10px; }

.layout {
  display: grid;
  grid-template-columns: 320px 1fr 380px;
  grid-template-rows: calc(100vh - 64px);
  gap: 12px;
  padding: 12px 14px 18px;
}

.panel {
  background: linear-gradient(145deg, var(--panel), var(--panel-2));
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 14px;
  overflow: hidden;
}

.controls { overflow-y: auto; }
.controls label { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 6px 0; color: var(--muted); }
.controls input[type=number] { width: 90px; }
.controls input[type=range] { flex: 1; }
.controls .group + .group { margin-top: 12px; }
.preset-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-top: 8px; }
.preset-row button { padding: 8px 6px; font-size: 12px; }
.preset-row .active { border-color: var(--accent); color: var(--accent); }

.group { margin-bottom: 16px; padding: 12px; border: 1px solid rgba(255,255,255,0.06); border-radius: 10px; background: rgba(255,255,255,0.015); }
.group-title { font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); margin-bottom: 8px; }

.row { display: flex; align-items: center; gap: 8px; }
.wrap { flex-wrap: wrap; }

.swatch-field { display: flex; flex-direction: column; gap: 4px; background: rgba(255,255,255,0.04); padding: 8px; border-radius: 8px; border: 1px solid rgba(255,255,255,0.04); }

.button-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 8px; }

button {
  cursor: pointer;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  padding: 10px 12px;
  background: rgba(255,255,255,0.03);
  color: var(--text);
  transition: all 150ms ease;
  font-weight: 600;
}
button:hover { border-color: rgba(98,244,197,0.6); color: white; }
button:active { transform: translateY(1px); }
button.primary { background: linear-gradient(120deg, var(--accent), var(--accent-2)); color: #001b16; border: none; }
button.ghost { background: rgba(255,255,255,0.04); }
button.small { padding: 6px 8px; font-size: 12px; }

.editor {
  display: flex;
  flex-direction: column;
}

.editor-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 13px;
}

.canvas-shell {
  position: relative;
  flex: 1;
  background: radial-gradient(circle at 20% 20%, rgba(98,244,197,0.06), transparent 30%),
              radial-gradient(circle at 80% 30%, rgba(45,209,209,0.05), transparent 35%),
              #0c1018;
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 12px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

#paint-canvas {
  background: #0b0f14;
  image-rendering: pixelated;
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: 0 14px 26px rgba(0,0,0,0.45);
  position: relative;
  z-index: 1;
}

#offset-indicator {
  position: absolute;
  top: 14px;
  right: 14px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(98,244,197,0.12);
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.03em;
  border: 1px solid rgba(98,244,197,0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 150ms ease;
}

.preview {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.preview-header { font-weight: 600; letter-spacing: 0.02em; color: var(--muted); }
.preview-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.preview-controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.shift-control { display: flex; align-items: center; gap: 6px; color: var(--muted); }
.shift-control input[type=range] { width: 120px; }
.shift-control span { width: 44px; text-align: right; color: var(--text); font-variant-numeric: tabular-nums; }
.preview-zoom button { margin-left: 6px; }
.preview-shell { position: relative; width: 100%; height: 520px; }
#preview-canvas { width: 100%; height: 100%; display: block; background: #0b0f14; border-radius: 10px; border: 1px solid rgba(255,255,255,0.08); image-rendering: pixelated; }
.preview-extra { display: grid; gap: 8px; margin-top: 8px; }

.canvas-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  mix-blend-mode: screen;
  background-size: var(--cellpx) var(--cellpx), var(--cellpx) var(--cellpx);
  background-image:
    repeating-linear-gradient(90deg,
      rgba(255,255,255,0.08) 0px,
      rgba(255,255,255,0.08) 1px,
      rgba(0,0,0,0.18) 1px,
      rgba(0,0,0,0.18) calc(var(--cellpx) - 1px)
    ),
    repeating-linear-gradient(0deg,
      rgba(255,255,255,0.07) 0px,
      rgba(255,255,255,0.07) 1px,
      rgba(0,0,0,0.20) 1px,
      rgba(0,0,0,0.20) calc(var(--cellpx) - 1px)
    );
  opacity: 0.5;
  z-index: 2;
}

.button-grid button.active,
.preset-row .active,
.preview-steps .active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(98,244,197,0.08);
}

.badge { padding: 3px 6px; border-radius: 999px; background: rgba(255,255,255,0.08); font-size: 11px; color: var(--muted); }

.palette-chip {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.12);
  cursor: pointer;
  position: relative;
}
.palette-chip::after { content: ""; position: absolute; inset: 0; border-radius: 6px; box-shadow: 0 0 0 2px rgba(255,255,255,0.05); }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: rgba(255,255,255,0.03); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 10px; }

.hint { color: var(--muted); }

input[type=color] {
  width: 100%; height: 36px; border: 1px solid rgba(255,255,255,0.08); border-radius: 8px; background: rgba(255,255,255,0.04); padding: 2px;
}

input[type=number], input[type=range] {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 6px;
  color: var(--text);
}

@media (max-width: 1200px) {
  .layout { grid-template-columns: 280px 1fr; grid-template-rows: auto auto; }
  .preview { grid-column: 1 / span 2; }
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; grid-template-rows: auto auto auto; }
  .controls { order: 2; }
  .preview { order: 3; }
  .editor { order: 1; min-height: 320px; }
}