:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-tertiary: #1e1e2e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent: #00d4ff;
  --accent-secondary: #00ff88;
  --danger: #ff4466;
  --focus-ring: #00d4ff;
  --focus-glow: rgba(0, 212, 255, 0.4);
  --radius-md: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  width: 600px; height: 600px; overflow: hidden;
  background: #000;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}
#app { width: 100%; height: 100%; position: relative; }
.screen { width: 100%; height: 100%; position: absolute; top: 0; left: 0; display: flex; flex-direction: column; }
.screen.hidden { display: none; }
.focusable { transition: all 0.15s ease; border: 2px solid transparent; cursor: pointer; outline: none; }
.focusable:focus { border-color: var(--focus-ring); box-shadow: 0 0 20px var(--focus-glow); }
.hidden { display: none !important; }

/* Header */
.hdr {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 18px 22px 12px;
}
.hdr h1 { font-size: 26px; font-weight: 700; letter-spacing: -0.5px; }
.hint { font-size: 13px; color: var(--text-muted); }

/* Swatch preview */
.swatch {
  margin: 0 22px 14px;
  height: 120px;
  border-radius: var(--radius-md);
  background: #000;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--bg-tertiary);
  transition: background 0.1s linear;
}
.swatch-hex {
  font-size: 34px; font-weight: 800; letter-spacing: 1px;
  font-variant-numeric: tabular-nums;
  text-transform: uppercase;
  padding: 6px 14px; border-radius: 8px;
  background: rgba(10,10,15,0.55);
  color: #fff;
}

/* Sliders */
.sliders { padding: 0 22px; display: flex; flex-direction: column; gap: 12px; }
.slider {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 12px 16px;
}
.slider-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.slider-label { font-size: 16px; color: var(--text-secondary); font-weight: 600; }
.slider-val { font-size: 18px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--text-primary); }
.track {
  position: relative; height: 16px; border-radius: 8px;
  background: var(--bg-tertiary); overflow: visible;
}
.fill {
  position: absolute; top: 0; left: 0; height: 100%;
  border-radius: 8px; background: var(--accent); width: 0%;
}
.knob {
  position: absolute; top: 50%; left: 0;
  width: 22px; height: 22px; border-radius: 50%;
  background: #fff; border: 3px solid var(--bg-primary);
  transform: translate(-50%, -50%);
  box-shadow: 0 1px 4px rgba(0,0,0,0.6);
}
/* Hue track shows the spectrum */
#trackH {
  background: linear-gradient(to right,
    #ff0000 0%, #ffff00 17%, #00ff00 33%,
    #00ffff 50%, #0000ff 67%, #ff00ff 83%, #ff0000 100%);
}
#trackH .fill { background: transparent; }

/* Readouts */
.readouts {
  display: flex; justify-content: space-around;
  padding: 14px 22px 6px;
  font-size: 15px; color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

/* Actions */
.actions {
  margin-top: auto;
  padding: 14px 22px 20px;
  display: flex; gap: 12px;
}
.btn {
  flex: 1;
  min-height: 64px;
  background: var(--accent);
  color: #001018;
  font-size: 17px; font-weight: 700;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
}
.btn-ghost {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}
.btn:focus { border-color: var(--focus-ring); box-shadow: 0 0 20px var(--focus-glow); }

/* Saved list */
.saved-list {
  flex: 1; overflow-y: auto;
  padding: 6px 22px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  align-content: start;
}
.saved-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 12px 14px; min-height: 64px;
  border: 2px solid transparent;
}
.saved-item:focus { border-color: var(--focus-ring); box-shadow: 0 0 20px var(--focus-glow); }
.saved-chip { width: 38px; height: 38px; border-radius: 8px; border: 1px solid var(--bg-tertiary); flex-shrink: 0; }
.saved-hex { font-size: 16px; font-weight: 700; text-transform: uppercase; font-variant-numeric: tabular-nums; }
.saved-empty { color: var(--text-muted); font-size: 16px; padding: 30px 0; grid-column: 1 / -1; text-align: center; }

/* Toast */
.toast {
  position: absolute; bottom: 96px; left: 50%; transform: translateX(-50%);
  background: var(--accent-secondary); color: #002012;
  font-size: 16px; font-weight: 700;
  padding: 12px 24px; border-radius: 999px;
  box-shadow: 0 4px 18px rgba(0,0,0,0.5);
  z-index: 50;
}