*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --or: #FF6600;
  --bk: #111110;
  --dk: #2C2C2A;
  --gy: #6B6A66;
  --lg: #F1EFE8;
  --md: #D3D1C7;
  --wh: #fff;
}

html, body {
  height: 100%;
  overflow: auto;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background: var(--lg);
  color: var(--dk);
}

/* ── LAYOUT ── */
.app {
  display: grid;
  grid-template-columns: 1fr 290px;
  height: 100vh;
}

/* ── LEFT ── */
.left {
  background: var(--wh);
  padding: 20px 28px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-right: 1px solid var(--md);
  overflow: hidden;
}

.model-sw {
  display: flex;
  border: 1.5px solid var(--md);
  align-self: flex-start;
}

.mbtn {
  padding: 7px 16px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  border: none;
  border-right: 1px solid var(--md);
  background: transparent;
  color: var(--gy);
  cursor: pointer;
  transition: all 0.15s;
}

.mbtn:last-child { border-right: none; }
.mbtn.active { background: var(--or); color: #fff; border-color: var(--or); }

.canvas-wrap {
  position: relative;
  width: 100%;
  flex: 1;
  min-height: 0;
}

canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

/* ── DISCLAIMER ── */
.disclaimer {
  font-size: 10px;
  line-height: 1.5;
  color: var(--gy);
  flex-shrink: 0;
  border-top: 1px solid var(--md);
  padding-top: 10px;
}

.disclaimer strong { color: var(--dk); }

.howto-hdr {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--dk);
  margin-bottom: 6px;
}

/* the four steps side by side, so the picture keeps its height */
.howto {
  list-style: none;
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.howto li { counter-increment: step; }

.howto li::before {
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px;
  height: 15px;
  margin-right: 5px;
  border-radius: 50%;
  background: var(--or);
  color: #fff;
  font-size: 9px;
  font-weight: 700;
}

.howto-note { margin-top: 8px; }

/* ── RIGHT PANEL ── */
.right {
  background: var(--lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pal-hdr {
  background: var(--dk);
  padding: 10px 14px;
  color: #fff;
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  flex-shrink: 0;
}

/* ── PALETTE SCROLL ── */
.pal-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 10px 11px;
}

.pal-scroll::-webkit-scrollbar { width: 3px; }
.pal-scroll::-webkit-scrollbar-thumb {
  background: var(--md);
  border-radius: 2px;
}

.fam-sec { margin-bottom: 10px; }

.fam-name {
  font-size: 7px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gy);
  margin-bottom: 4px;
}

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

.sw {
  aspect-ratio: 1;
  cursor: pointer;
  border: 2px solid transparent;
  position: relative;
  transition: transform 0.1s, border-color 0.1s;
}

.sw:hover { transform: scale(1.25); z-index: 2; }
.sw.a1 { border-color: var(--or); transform: scale(1.15); z-index: 3; }

.sw::after {
  content: attr(data-r);
  position: absolute;
  bottom: calc(100% + 3px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bk);
  color: #fff;
  font-size: 8px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  padding: 2px 5px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.1s;
  z-index: 10;
}

.sw:hover::after { opacity: 1; }

/* ── PALETTE FOOTER ── */
.pal-foot {
  border-top: 1px solid var(--md);
  padding: 9px 11px;
  background: var(--wh);
  display: flex;
  gap: 6px;
  align-items: center;
  flex-shrink: 0;
}

.pd {
  width: 16px;
  height: 16px;
  background: var(--or);
  border: 1px solid var(--md);
  flex-shrink: 0;
}

.ft { font-size: 8px; color: var(--gy); line-height: 1.5; }
.ft strong { color: var(--dk); }

/* ── RESPONSIVE ───────────────────────────────────────────── */

/* Small laptops / tablets in landscape: narrower panel */
@media (max-width: 1200px) {
  .app { grid-template-columns: 1fr 260px; }
  .left { padding: 16px 20px 12px; }
  .howto { grid-template-columns: repeat(2, 1fr); gap: 8px 14px; }
}

/* Phones and tablets in portrait: one column, machine pinned on top */
@media (max-width: 900px), (orientation: portrait) and (max-width: 1100px) {
  :root { --viewer-h: min(42vh, 52vw); }

  html, body { height: auto; overflow: visible; }   /* page scroll must stay on the viewport for sticky */

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

  /* let the children of both columns be ordered as one list */
  .left, .right { display: contents; }

  .model-sw {
    order: 1;
    align-self: stretch;
    margin: 12px 16px 0;
    background: var(--wh);
  }
  .mbtn { flex: 1; padding: 10px 6px; font-size: 11px; }

  .canvas-wrap {
    order: 2;
    position: sticky;
    top: 0;
    z-index: 5;
    flex: none;
    height: var(--viewer-h);
    padding: 8px 16px;
    background: var(--wh);
    border-bottom: 1px solid var(--md);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.06);
  }

  .pal-hdr { order: 3; padding: 12px 16px; font-size: 10px; }

  .slot-sw {
    order: 4;
    position: sticky;
    top: var(--viewer-h);
    z-index: 4;
    padding: 10px 16px;
  }
  .zone-select { font-size: 13px; padding: 11px 34px 11px 12px; }

  .pal-scroll {
    order: 5;
    flex: none;
    overflow: visible;
    padding: 12px 16px;
    background: var(--lg);
  }
  .pal-family-label, .fam-name { font-size: 9px; margin-bottom: 6px; }
  .pal-grid, .fam-grid { gap: 4px; }
  .pal-family, .fam-sec { margin-bottom: 14px; }

  /* no hover zoom / tooltip on touch screens */
  .swatch:hover, .sw:hover { transform: none; }
  .swatch::after, .sw::after { display: none; }

  .opts { order: 6; padding: 12px 16px; gap: 8px 20px; }
  .opts-hdr { font-size: 9px; }
  .opts label { font-size: 13px; }
  .opts input { width: 18px; height: 18px; }

  .pal-foot { order: 7; padding: 12px 16px; }
  .fr { font-size: 12px; }
  .fn { font-size: 10px; }
  .ft { font-size: 12px; }
  .pd { width: 18px; height: 18px; }

  .disclaimer {
    order: 8;
    max-width: none;
    padding: 16px 16px 28px;
    font-size: 12px;
    background: var(--wh);
  }
  .howto { grid-template-columns: 1fr; gap: 8px; }
  .howto-hdr { font-size: 11px; }
}

/* Wider portrait screens (tablets): more swatches per row */
@media (min-width: 600px) and (max-width: 1100px) and (orientation: portrait),
       (min-width: 600px) and (max-width: 900px) {
  .pal-grid, .fam-grid { grid-template-columns: repeat(12, 1fr); }
}