:root {
  --bg: #f5f5f4;
  --fg: #1c1917;
  --fg-muted: #78716c;
  --border: #d6d3d1;
  --panel-bg: #ffffff;
  --accent: #1c1917;
  --danger: #ef4444;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Space Grotesk', sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-font-smoothing: antialiased; }
body {
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 11px;
  display: flex;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  letter-spacing: 0.02em;
}

.sidebar {
  width: 360px;
  min-width: 360px;
  background: var(--panel-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 10;
  height: 100%;
}

.brand {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #fafaf9;
}

.brand-title {
  font-family: var(--font-sans);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
}

.brand-sub {
  color: var(--fg-muted);
  display: inline-block;
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-top: 4px;
  text-decoration: none;
}

.brand-sub:hover { color: var(--fg); }

.engine-overview-link {
  align-items: center;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border);
  color: var(--fg-muted);
  display: flex;
  font-size: 10px;
  gap: 8px;
  min-height: 38px;
  padding: 0 20px;
  text-decoration: none;
}

.engine-overview-link:hover {
  background: #fafaf9;
  color: var(--fg);
}

.controls-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.settings-scroll-handle {
  display: none;
}

.section-title {
  font-size: 9px;
  font-weight: 700;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.label-row {
  display: flex;
  justify-content: space-between;
  color: var(--fg-muted);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  align-items: center;
}

.label-row span.val {
  color: var(--fg);
  font-weight: 700;
}

select, button {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 7px 10px;
  border-radius: 5px;
  outline: none;
  transition: all 0.15s ease;
  cursor: pointer;
}

select:hover, button:hover {
  border-color: var(--fg-muted);
  background: var(--bg);
}

.btn-primary {
  background: var(--fg);
  color: var(--panel-bg);
  font-weight: 700;
  border: 1px solid var(--fg);
}

.btn-primary:hover {
  background: #44403c;
  color: #fff;
}

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  background: transparent;
  height: 16px;
}

input[type=range]::-webkit-slider-runnable-track {
  width: 100%;
  height: 2px;
  background: var(--border);
  cursor: pointer;
}

input[type=range]::-webkit-slider-thumb {
  height: 12px;
  width: 12px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  -webkit-appearance: none;
  margin-top: -5px;
}

.palette-container {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.swatch-wrap {
  position: relative;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border);
  cursor: pointer;
  flex-shrink: 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  transition: transform 0.15s ease;
}

.swatch-wrap:hover {
  transform: scale(1.08);
  z-index: 1; /* Keep the delete button above neighboring color inputs. */
}


.swatch-wrap input[type="color"] {
  position: absolute;
  top: -10px;
  left: -10px;
  width: 50px;
  height: 50px;
  border: none;
  cursor: pointer;
  opacity: 0;
}

.swatch-del {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 14px;
  height: 14px;
  background: var(--danger);
  color: #fff;
  border-radius: 50%;
  font-size: 9px;
  line-height: 12px;
  text-align: center;
  display: none;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
  cursor: pointer;
  z-index: 5;
}

.swatch-wrap:hover .swatch-del {
  display: flex;
}

.swatch-wrap.bg-swatch {
  border-radius: 6px;
  width: 36px;
  height: 36px;
  border: 2px solid var(--fg);
}

.btn-add-color {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px dashed var(--fg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  font-size: 16px;
  color: var(--fg-muted);
  padding: 0;
  transition: all 0.15s ease;
}

.btn-add-color:hover {
  border-color: var(--fg);
  color: var(--fg);
  background: rgba(0,0,0,0.03);
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

.viewport {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 30px;
  background: var(--bg);
}

.canvas-wrapper {
  border: 1px solid var(--border);
  background: var(--panel-bg);
  display: flex;
  box-shadow: 0 12px 40px -12px rgba(0,0,0,0.12);
  max-width: 100%;
  max-height: calc(100vh - 120px);
  max-height: calc(100dvh - 120px);
}

canvas {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 120px);
  max-height: calc(100dvh - 120px);
  object-fit: contain;
  image-rendering: auto;
}

.aspect-bar {
  position: absolute;
  bottom: 20px;
  display: flex;
  gap: 6px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  padding: 6px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.aspect-btn {
  font-size: 10px;
  padding: 6px 12px;
  border: none;
  background: transparent;
  color: var(--fg-muted);
  font-weight: 500;
}

.aspect-btn.active {
  background: var(--fg);
  color: var(--panel-bg);
  border-radius: 4px;
  font-weight: 700;
}

@media (max-width: 860px) {
  body {
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
  }
  .sidebar {
    width: 100%;
    min-width: 100%;
    height: 55vh;
    height: 55dvh;
    border-right: none;
    border-top: 1px solid var(--border);
    order: 2;
  }
  .viewport {
    height: 45vh;
    height: 45dvh;
    padding: 12px 12px 60px;
    order: 1;
  }
  canvas {
    max-height: calc(45vh - 75px);
    max-height: calc(45dvh - 75px);
  }
  .aspect-bar {
    bottom: 8px;
    flex-wrap: wrap;
    justify-content: center;
    width: 92%;
    padding: 4px;
  }
  .brand {
    padding: 10px 16px;
  }
  .brand-title { font-size: 18px; }
  .engine-overview-link { min-height: 34px; padding: 0 16px; }
  .settings-scroll-handle {
    align-items: center;
    background: #fafaf9;
    border: 0;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    color: var(--fg-muted);
    display: flex;
    font-size: 9px;
    gap: 6px;
    justify-content: center;
    letter-spacing: 0.08em;
    min-height: 34px;
    text-transform: uppercase;
    touch-action: none;
  }
  .settings-scroll-handle span {
    color: var(--fg);
    font-size: 14px;
    line-height: 1;
  }
  .controls-scroll {
    overscroll-behavior: contain;
  }
  .controls-scroll input[type=range] {
    touch-action: none;
  }
  .swatch-del {
    display: flex;
  }
}