/* Perfect numbers: the scale of divisors, and the Mersenne prime hunt. */

/* The scale. --n is n's share of the width; the divisors may run past it. */

.scale {
  --pad: 14px;
  --n: 1;
  /* The blocks are sized in percentages, so their labels mustn't widen the page on a phone. */
  contain: inline-size;
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 18px var(--pad);
  border-radius: 8px;
  background: var(--paper);
}

.scale-n,
.part {
  display: grid;
  align-items: center;
  height: 48px;
  overflow: hidden;
  white-space: nowrap;
  font-weight: 720;
  font-variation-settings: 'wdth' 75;
  line-height: 1;
}

.scale-n {
  width: calc(var(--n) * 100%);
  padding: 0 12px;
  border-radius: 10px;
  background: var(--key);
  color: var(--on-key);
  font-size: 1.6rem;
  box-shadow: inset 0 -4px 0 color-mix(in srgb, #000 30%, transparent);
}

.scale.is-perfect .scale-n {
  background: var(--red);
  color: #fff;
}

@media (prefers-color-scheme: dark) {
  .scale.is-perfect .scale-n {
    color: var(--on-key);
  }
}

.scale-parts {
  display: flex;
}

.part {
  flex: none;
  justify-items: center;
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  font-size: 1.2rem;
  box-shadow: inset 0 0 0 1.5px var(--ink);
}

/* The divisors too thin to draw one by one, packed into a striped block. */
.part--rest {
  background: repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 4px);
}

/* Its label sits on its own patch of paper. */
.part--rest span {
  padding: 4px 6px;
  border-radius: 4px;
  background: var(--paper);
  font-size: 1rem;
}

.scale-n.is-tight {
  color: transparent;
}

.part.is-tight span {
  visibility: hidden;
}

/* Where n ends, across both rows. */
.scale-line {
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: calc(var(--pad) + var(--n) * (100% - 2 * var(--pad)));
  border-left: 2px dashed var(--ink-soft);
  transform: translateX(-1px);
}

.scale.is-perfect .scale-line {
  border-left: 2px solid var(--red);
}

.sum {
  margin-top: 12px;
  font: 400 1rem/1.5 var(--print);
  text-align: center;
  text-wrap: balance;
}

.machine .entry {
  margin-top: 22px;
}

/* Room for all twelve digits. */
#number {
  max-width: calc(13ch + 28px);
}

.machine .verdict {
  margin-top: 20px;
}

.binary {
  font-family: var(--print);
  font-weight: 700;
  overflow-wrap: anywhere;
}

/* The hunt */

.newest {
  max-width: 560px;
  margin: 0 0 22px;
}

.newest figcaption {
  margin-bottom: 8px;
  font-weight: 650;
}

.digits {
  height: 12rem;
  padding: 10px 12px 18px;
  overflow: hidden;
  background: var(--paper);
  font-family: var(--print);
  line-height: 1.25;
  word-break: break-all;
}

.finds {
  width: 100%;
  max-width: 560px;
  border-collapse: collapse;
  font: 400 0.95rem/1.3 var(--print);
  font-variant-numeric: tabular-nums;
}

.finds th {
  padding: 0 6px 6px;
  border-bottom: 1px solid var(--rule);
  color: var(--ink-soft);
  font: 650 0.85rem/1.2 var(--font);
  text-align: right;
}

.finds td {
  padding: 3px 6px;
  text-align: right;
  white-space: nowrap;
}

.finds th:first-child,
.finds td:first-child {
  padding-left: 0;
  color: var(--ink-soft);
}

.finds th:last-child,
.finds td:last-child {
  padding-right: 0;
}

.finds caption {
  padding-bottom: 10px;
  color: var(--ink-soft);
  font: 400 0.95rem/1.45 var(--font);
  text-align: left;
}

.finds .detail td {
  padding: 4px 0 12px;
  white-space: normal;
  font: 600 0.95rem/1.45 var(--font);
  text-align: left;
}

.find {
  min-width: 24px;
  min-height: 24px;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-decoration: underline dotted 1px;
  text-underline-offset: 0.2em;
  cursor: pointer;
}

.find[aria-expanded='true'] {
  font-weight: 700;
  text-decoration-style: solid;
}

.record {
  max-width: 560px;
  margin-top: 14px;
  color: var(--ink-soft);
}

@media (max-width: 420px) {
  .finds {
    font-size: 0.85rem;
  }

  .finds th,
  .finds td {
    padding-inline: 4px;
  }
}