/* Ikinyamakuru desk. Cream paper, serif reading text, sans controls,
   typewriter labels, and highlighter swipes behind the words that matter. */

:root {
  --paper: #fffff1;
  --note: #f0f0d6;
  --band: #e4e4a9;
  --ink: #262626;
  --ink-soft: #575757;
  --ink-faint: #787463;
  --rule: #d9d9c4;
  --accent: #5b6c14;
  --swipe-file: #ffaa4a;
  --swipe-rival: #f493ff;
  --swipe-held: #dbd4bc;
  --drift: #ececd3;
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --prose: 650px;
  --gutter: 16px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--band);
}

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Highlighter swipe: a marker band across the lower half of the line. */
.swipe,
mark.support,
mark.rival,
.sections span,
.answer h2 {
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
  background-repeat: no-repeat;
  background-size: 100% 55%;
  background-position: 0 82%;
}

.swipe,
.answer h2 {
  background-size: 100% 42%;
  background-position: 0 86%;
}

/* Header */

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.25rem var(--gutter) 0;
}

.brand {
  display: inline-block;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  transform: rotate(-3deg);
  padding: 0.1rem 0.5rem;
  background: var(--band);
}

.brand:hover {
  background: var(--swipe-file);
}

nav a {
  font-family: var(--mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
}

nav a:hover {
  border-bottom-width: 2px;
}

/* Hero */

.hero {
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: 4.5rem var(--gutter) 3rem;
  isolation: isolate;
}

.hero-lab {
  padding-top: 3rem;
  padding-bottom: 1.5rem;
}

.drift {
  position: absolute;
  inset: 0;
  z-index: -1;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at center, transparent 18%, #000 70%);
  mask-image: radial-gradient(ellipse at center, transparent 18%, #000 70%);
}

.drift-row {
  margin: 0;
  white-space: nowrap;
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.5rem, 4vw, 2.6rem);
  color: var(--drift);
  animation: drift calc(90s + var(--row) * 14s) linear infinite;
  animation-direction: alternate;
}

.drift-row:nth-child(even) {
  animation-direction: alternate-reverse;
}

.drift-row span {
  margin-right: 1.4em;
}

@keyframes drift {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

h1 {
  max-width: 14em;
  margin: 0 auto;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.4rem, 7vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.swipe {
  padding: 0 0.15em;
  background-image: linear-gradient(var(--swipe-file), var(--swipe-file));
}

.lede {
  max-width: 30em;
  margin: 1.75rem auto 0;
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  line-height: 1.35;
  color: var(--ink-soft);
}

.lede strong {
  font-weight: 600;
  color: var(--ink);
}

.sections {
  max-width: 44rem;
  margin: 2rem auto 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem 0.6rem;
  font-family: var(--sans);
  font-style: italic;
  font-size: 1rem;
}

.sections span {
  padding: 0 0.3rem;
  background-image: linear-gradient(var(--swipe-held), var(--swipe-held));
}

/* Main column */

.sheet {
  max-width: var(--prose);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

main {
  padding-bottom: 4rem;
}

.ask label {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

textarea {
  display: block;
  width: 100%;
  min-height: 13rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: #fff;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.55;
  resize: vertical;
  white-space: pre-wrap;
  tab-size: 4;
  box-shadow: 4px 4px 0 var(--band);
}

textarea::placeholder {
  color: #9a978a;
  font-style: italic;
}

.ask-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
}

.hint {
  margin: 0.2rem 0 0;
  font-family: var(--sans);
  font-size: 0.9rem;
  line-height: 1.4;
  color: var(--ink-soft);
}

button {
  flex: none;
  padding: 0.6rem 1.6rem;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

button:hover {
  transform: translate(-2px, -2px);
  box-shadow: 3px 3px 0 var(--swipe-file);
}

button:disabled {
  opacity: 0.6;
  cursor: progress;
}

/* Answer */

/* The answer runs wider than the form: the decision on the left, the passage
   and its marks on the right. Narrow screens stack the decision first. */
.answer {
  width: calc(100% - 2 * var(--gutter));
  max-width: 1080px;
  margin: 2.5rem auto 0;
  padding: 2.25rem 2.25rem 2rem;
  background: var(--note);
  border-top: 3px solid var(--ink);
  display: grid;
  grid-template-columns: minmax(17rem, 1fr) minmax(0, 1.75fr);
  grid-template-areas: "decision why";
  column-gap: 2.5rem;
  align-items: start;
  scroll-margin-top: 1.5rem;
}

.decision {
  grid-area: decision;
  padding-right: 2.5rem;
  border-right: 1px solid var(--rule);
}

.answer[hidden] {
  display: none;
}

.kicker {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.answer h2 {
  display: inline;
  margin: 0;
  padding: 0 0.2em;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.2rem, 6vw, 3.2rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  background-image: linear-gradient(var(--swipe-file), var(--swipe-file));
}

.answer.held .kicker {
  color: var(--ink-faint);
}

.answer.held h2 {
  background-image: linear-gradient(var(--swipe-held), var(--swipe-held));
}

.answer .kicker + h2 {
  margin-top: 0.4rem;
}

.en {
  margin: 0.6rem 0 0;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1rem;
  text-transform: lowercase;
}

.blurb {
  margin: 0.5rem 0 0;
  font-size: 1.05rem;
  color: var(--ink-soft);
}

.score {
  margin: 1.5rem 0 0.5rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.tops {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.tops li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "kin pct"
    "label label"
    "meter meter";
  column-gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--rule);
}

.tops .kin {
  grid-area: kin;
  font-style: italic;
  font-size: 1.1rem;
}

.tops .pct {
  grid-area: pct;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.tops .label {
  grid-area: label;
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--ink-faint);
}

.meter {
  grid-area: meter;
  display: block;
  height: 6px;
  margin-top: 0.4rem;
  background: rgba(38, 38, 38, 0.08);
}

.meter > span {
  display: block;
  height: 100%;
  width: calc(var(--p) * 1%);
  background: var(--accent);
}

.tops li:not(:first-child) .meter > span {
  background: var(--ink-faint);
}

.why {
  grid-area: why;
  min-width: 0;
}

.why h3 {
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.why p {
  margin: 0.5rem 0;
}

.key {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.why .passage {
  margin-top: 1rem;
  padding: 1.1rem 1.25rem;
  background: #fff;
  border-left: 3px solid var(--band);
  font-size: 1.02rem;
  line-height: 1.75;
  max-height: 34rem;
  overflow-y: auto;
  white-space: pre-wrap; /* keep the article's line breaks, blank lines, and spacing */
  tab-size: 4;
  overflow-wrap: anywhere;
}

mark.support,
mark.rival {
  color: var(--ink);
  padding: 0 0.15em;
  background-color: transparent;
}

mark.support {
  background-image: linear-gradient(var(--swipe-file), var(--swipe-file));
}

mark.rival {
  font-style: italic;
  background-image: linear-gradient(var(--swipe-rival), var(--swipe-rival));
}

.answer.error {
  display: block;
  max-width: calc(var(--prose) - 2 * var(--gutter));
  padding: 1.25rem 1.5rem;
  border-top-color: #b4471f;
}

.answer.error p {
  margin: 0;
  font-family: var(--sans);
  font-weight: 600;
}

/* Examples */

.examples {
  margin-top: 3.5rem;
}

.examples h2 {
  margin: 0;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.examples .note {
  margin: 0.4rem 0 1rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.examples ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: example;
  border-top: 1px solid var(--rule);
}

.examples li {
  counter-increment: example;
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--rule);
}

.examples li::before {
  content: counter(example, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.9;
  color: var(--ink-faint);
}

.examples a {
  font-size: 1.05rem;
  line-height: 1.45;
  text-decoration: none;
  overflow-wrap: anywhere;
  background-image: linear-gradient(var(--swipe-held), var(--swipe-held));
  background-repeat: no-repeat;
  background-size: 0% 62%;
  background-position: 0 78%;
  transition: background-size 0.25s ease;
}

.examples a:hover,
.examples a:focus-visible {
  background-size: 100% 62%;
}

/* Experiments table */

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 1rem;
}

thead th {
  padding: 0 0.75rem 0.6rem;
  border-bottom: 2px solid var(--ink);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-align: right;
  vertical-align: bottom;
  color: var(--ink-faint);
}

thead th:first-child {
  text-align: left;
  padding-left: 0;
}

td {
  padding: 0.7rem 0.75rem;
  border-bottom: 1px solid var(--rule);
  text-align: right;
  font-family: var(--mono);
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
}

td:first-child {
  padding-left: 0;
  text-align: left;
  font-family: var(--sans);
  font-size: 1rem;
}

tr.chosen td {
  background: var(--note);
  font-weight: 500;
}

tr.chosen td:first-child {
  font-weight: 700;
  text-decoration-line: underline;
  text-decoration-color: var(--swipe-file);
  text-decoration-thickness: 0.55em;
  text-underline-offset: -0.35em;
  text-decoration-skip-ink: none;
}

.filing {
  margin-top: 1.5rem;
  font-size: 1.05rem;
  color: var(--ink-soft);
}

/* Medium screens: one column, decision first */

@media (max-width: 860px) {
  .answer {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "decision"
      "why";
    row-gap: 2rem;
  }

  .decision {
    padding-right: 0;
    border-right: 0;
  }
}

/* Small screens */

@media (max-width: 640px) {
  body {
    font-size: 1.05rem;
  }

  .hero {
    padding-top: 3rem;
  }

  .ask-bar {
    flex-direction: column;
  }

  button {
    width: 100%;
  }

  .answer {
    padding: 1.5rem 1rem 1.25rem;
  }

  .why .passage {
    padding: 1rem;
  }

  thead {
    display: none;
  }

  table,
  tbody,
  tr,
  td {
    display: block;
    width: 100%;
  }

  tr {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--rule);
  }

  td {
    display: flex;
    justify-content: space-between;
    padding: 0.2rem 0;
    border: 0;
  }

  td:first-child {
    font-weight: 600;
  }

  td[data-label]::before {
    content: attr(data-label);
    font-family: var(--sans);
    color: var(--ink-faint);
  }

  tr.chosen td,
  tr.chosen td:first-child {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .drift-row {
    animation: none;
  }

  button,
  .examples a {
    transition: none;
  }

  button:hover {
    transform: none;
  }
}