:root {
  --bg: #faf7f2;
  --ink: #2b2118;
  --accent: #7a2e2e;
  --accent-soft: #f3e6e6;
  --line: #e5ddd2;
  --card: #ffffff;
  --muted: #8a7a68;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1a1512;
    --ink: #f0e8dd;
    --accent: #d98a8a;
    --accent-soft: #3a2626;
    --line: #3a3128;
    --card: #241d18;
    --muted: #a08d79;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: 16px;
  max-width: 480px;
  margin-inline: auto;
}
h1 { font-size: 1.4rem; margin: 0 0 16px; }
h2 { font-size: 1.1rem; }
button {
  font: inherit;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  width: 100%;
  margin: 6px 0;
  cursor: pointer;
}
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button:disabled { opacity: 0.5; cursor: default; }
input, select, textarea {
  font: inherit;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  width: 100%;
  margin: 6px 0;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  margin: 12px 0;
}
.muted { color: var(--muted); font-size: 0.9rem; }
.row { display: flex; gap: 8px; align-items: center; }
.hidden { display: none; }
.code {
  font-size: 2rem;
  letter-spacing: 0.2em;
  font-weight: 700;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.slider-row { display: grid; grid-template-columns: 90px 1fr 34px; gap: 8px; align-items: center; margin: 10px 0; }
.slider-row > span:first-child {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.slider-row input[type="range"] { margin: 0; width: 100%; }
.slider-row .val { text-align: right; font-variant-numeric: tabular-nums; }

.slider-wrap { display: flex; flex-direction: column; width: 100%; }
.slider-ends {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--muted);
  padding-inline: 4px;
  margin-top: -4px;
}

/* ---- Wheel picker ---- */
.wheel {
  position: relative;
  height: 102px;          /* 3 items of 34px */
  overflow: hidden;
  border-block: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  touch-action: pan-y;
  -webkit-user-select: none;
  user-select: none;
}
.wheel-inner {
  height: 100%;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scrollbar-width: none;
  padding: 34px 0;        /* one item above/below so first/last can center */
}
.wheel-inner::-webkit-scrollbar { display: none; }
.wheel-item {
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  scroll-snap-align: center;
  cursor: pointer;
  transition: color 80ms;
}
.wheel-item.is-active { color: var(--ink); font-weight: 700; font-size: 1.1rem; }
.wheel::after {
  /* center band highlight */
  content: '';
  position: absolute;
  inset-inline: 6px;
  top: 33px;
  height: 34px;
  border-block: 1px solid var(--accent);
  pointer-events: none;
  opacity: 0.5;
}

/* ---- Full-width filled sliders ---- */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 28px;
  background: transparent;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(
    to right,
    var(--accent) 0%,
    var(--accent) var(--fill, 0%),
    var(--line) var(--fill, 0%)
  );
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  margin-top: -7px;
  border-radius: 50%;
  background: var(--card);
  border: 2px solid var(--accent);
}
input[type="range"]::-moz-range-track { height: 6px; border-radius: 3px; background: var(--line); }
input[type="range"]::-moz-range-progress { height: 6px; border-radius: 3px; background: var(--accent); }
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--card); border: 2px solid var(--accent);
}
table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th, td { padding: 6px 8px; border-bottom: 1px solid var(--line); text-align: left; }
th { color: var(--muted); font-weight: 600; }