/* Primer page components. The design source expressed all of this inline;
   here it is one class per repeated element so the markup stays readable. */

/* ── page shell ─────────────────────────────────────────────────────────── */
.page { max-width: 1040px; margin: 0 auto; padding: 0 28px 96px; }

.topbar {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  padding: 22px 0 16px; border-bottom: 1px solid var(--color-divider);
}
.topbar__left { display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.topbar__brand {
  font-family: var(--font-heading); font-size: 19px; letter-spacing: .01em;
  color: var(--color-text); text-decoration: none;
}
.topbar__prev { font-family: var(--font-heading); font-size: 13px; }

/* Sibling primer pages are not part of this repository yet — these read as
   links but do not navigate. See README. */
[data-pending] { cursor: default; }

.eyebrow {
  font-family: var(--font-heading); font-weight: 600; font-size: 12px;
  letter-spacing: .16em; text-transform: uppercase; color: var(--color-accent-700);
}
.section__eyebrow { display: block; margin-bottom: 10px; }
.section__title { font-size: 34px; margin: 0 0 8px; }

.prose {
  font-size: 16px; line-height: 1.75; text-align: justify;
  max-width: 64ch; color: var(--color-neutral-800);
}
.aside {
  font-size: 14px; color: var(--color-neutral-600); font-style: italic;
  margin-top: 14px; text-align: justify; max-width: 64ch;
}
b { color: var(--color-neutral-800); }

/* ── hero ───────────────────────────────────────────────────────────────── */
.hero { padding: 56px 0 20px; }
.hero__eyebrow { display: block; letter-spacing: .18em; margin-bottom: 14px; }
.hero__title {
  font-size: 56px; line-height: 1.05; letter-spacing: -.02em;
  margin: 0 0 22px; max-width: 16ch;
}
.hero__title--w15 { max-width: 15ch; }
.hero__title--w18 { max-width: 18ch; }
.hero__lede {
  font-size: 18px; line-height: 1.75; text-align: justify;
  max-width: 62ch; color: var(--color-neutral-800);
}
.chips { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }
.chip {
  border: 1px solid var(--color-accent-400); color: var(--color-accent-700);
  border-radius: var(--radius-md); padding: 5px 12px;
  font-family: var(--font-heading); font-size: 13px;
}

/* ── "30 seconds of vocabulary" box ─────────────────────────────────────── */
.termbox {
  border: 1px solid var(--color-accent-400); border-radius: var(--radius-md);
  background: var(--color-accent-100); padding: 22px 24px; margin: 30px 0 0;
}
.termbox__eyebrow { display: block; letter-spacing: .12em; margin-bottom: 14px; }
.termbox__grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px 22px;
}
.termbox__term { font-family: var(--font-heading); font-size: 15px; }
.termbox__en { font-size: 11px; color: var(--color-neutral-500); }
.termbox__def { font-size: 13px; line-height: 1.6; color: var(--color-neutral-700); }
.termbox__note { font-size: 12px; color: var(--color-neutral-600); margin-top: 14px; }

/* ── cost cards ─────────────────────────────────────────────────────────── */
.cardgrid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 24px 0 0; }
.tcard {
  border: 1px solid var(--color-divider); border-top: 3px solid var(--color-accent-500);
  border-radius: var(--radius-md); padding: 18px 16px; background: var(--color-neutral-100);
}
.tcard--hot { border-top-color: var(--hot); }
.tcard__kicker { font-family: var(--font-heading); font-size: 13px; color: var(--color-accent-700); }
.tcard--hot .tcard__kicker { color: var(--hot); }
.tcard__title { font-family: var(--font-heading); font-size: 16px; margin: 6px 0; }
.tcard__body { font-size: 13px; line-height: 1.6; color: var(--color-neutral-700); }
.cardgrid--roomy .tcard { padding: 18px 20px; }
.cardgrid--roomy .tcard__title { font-size: 17px; }
.cardgrid--3 { grid-template-columns: repeat(3, 1fr); }

.callout {
  border: 1px solid var(--color-divider); border-left: 3px solid var(--hot);
  border-radius: var(--radius-sm); background: var(--hot-tint);
  padding: 16px 20px; margin: 22px 0 0;
}
.callout__title {
  font-family: var(--font-heading); font-size: 15px;
  color: var(--color-neutral-900); margin-bottom: 4px;
}
.callout__body {
  font-size: 15px; line-height: 1.7; text-align: justify;
  margin: 0; color: var(--color-neutral-800);
}
.callout__body b { color: var(--color-neutral-900); }

/* ── interactive panels ─────────────────────────────────────────────────── */
/* Neutral surface that most demos and diagrams sit on. Pages tweak the
   padding locally where a diagram needs more or less room. */
.panel {
  border: 1px solid var(--color-divider); border-radius: var(--radius-md);
  background: var(--color-neutral-100); padding: 24px; margin: 24px 0 0;
}

/* Two side-by-side "this approach vs that approach" cards. */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 24px 0 0; }
.duo__card {
  border: 1px solid var(--color-divider); border-top: 3px solid var(--color-accent-500);
  border-radius: var(--radius-md); padding: 20px; background: var(--color-neutral-100);
}
.duo__card--hot { border-top-color: var(--hot); }
.duo__card--muted { border-top-color: var(--color-neutral-400); }
.duo__kicker { font-family: var(--font-heading); font-size: 13px; color: var(--color-accent-700); }
.duo__card--hot .duo__kicker { color: var(--hot); }
.duo__card--muted .duo__kicker { color: var(--color-neutral-600); }
.duo__title { font-family: var(--font-heading); font-size: 19px; margin: 6px 0 10px; }
.duo__body { font-size: 14px; line-height: 1.65; color: var(--color-neutral-800); }

.lab {
  border: 1px solid var(--color-divider); border-radius: var(--radius-md);
  background: var(--color-neutral-100); padding: 24px; margin: 24px 0 0;
}
.lab__cols { display: grid; grid-template-columns: 1fr 300px; gap: 26px; align-items: start; }
.lab__caption { font-size: 11px; color: var(--color-neutral-500); letter-spacing: .06em; margin-bottom: 8px; }

.bar__label {
  font-family: var(--font-heading); font-size: 13px; color: var(--color-neutral-700);
  display: flex; justify-content: space-between; margin-bottom: 6px;
}
.bar {
  position: relative; height: 34px; background: var(--color-neutral-200);
  border-radius: 4px; overflow: hidden; border: 1px solid var(--color-divider);
}
.bar__seg { position: absolute; top: 0; bottom: 0; }
.bar__seg--hatch {
  left: 0;
  background: repeating-linear-gradient(45deg, #aab4c5, #aab4c5 6px, #b8c1cf 6px, #b8c1cf 12px);
}
.bar__budget { position: absolute; top: -2px; bottom: -2px; width: 2px; background: var(--hot); }
.bar__label--render { margin-top: 16px; }
.axis {
  display: flex; justify-content: space-between;
  font-size: 10px; color: var(--color-neutral-500); margin-top: 5px;
}
.axis__budget { color: var(--hot); }

.legend { display: flex; flex-wrap: wrap; gap: 10px 16px; margin-top: 16px; }
.legend__item {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--font-heading); font-size: 12px; color: var(--color-neutral-700);
}
.legend__swatch { width: 11px; height: 11px; border-radius: 2px; }
.legend__ms { color: var(--color-neutral-500); }

.control { margin-bottom: 16px; }
.control:last-of-type { margin-bottom: 18px; }
.control__row {
  display: flex; justify-content: space-between;
  font-family: var(--font-heading); font-size: 14px; margin-bottom: 6px;
}
.control__value { color: var(--color-accent-700); }
.control__hint { color: var(--color-neutral-500); font-size: 11px; }

/* outline button — play/pause and other panel controls */
.btn-line {
  cursor: pointer; font-family: var(--font-heading); font-weight: 600; font-size: 14px;
  background: transparent; border: 1px solid var(--color-accent); color: var(--color-accent-700);
  border-radius: var(--radius-md); padding: 7px 18px;
}
.btn-line:hover { background: color-mix(in srgb, var(--color-accent) 12%, transparent); }
.btn-line--muted { border-color: var(--color-neutral-400); color: var(--color-neutral-800); padding: 7px 14px; }
.btn-line--muted:hover { border-color: var(--color-accent); color: var(--color-accent-700); background: transparent; }

/* Two (or more) mutually exclusive modes; the active one is aria-pressed. */
.toggle2 { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.toggle2__btn {
  cursor: pointer; font-family: var(--font-heading); font-weight: 600; font-size: 14px;
  border-radius: var(--radius-md); padding: 8px 16px;
  border: 1px solid var(--color-neutral-400); background: transparent; color: var(--color-neutral-800);
}
.toggle2__btn:hover { border-color: var(--color-accent); color: var(--color-accent-700); }
.toggle2__btn[aria-pressed="true"] { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }

/* Quick "jump to a known configuration" buttons under a demo. */
.presets { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.presets__label { font-family: var(--font-heading); font-size: 13px; color: var(--color-neutral-600); align-self: center; }
.presets__btn {
  cursor: pointer; font-family: var(--font-heading); font-size: 13px;
  background: transparent; border: 1px solid var(--color-accent-400);
  color: var(--color-accent-700); border-radius: var(--radius-md); padding: 6px 14px;
}
.presets__btn:hover { background: var(--color-accent-100); }

.check {
  display: flex; align-items: center; gap: 9px;
  font-family: var(--font-heading); font-size: 14px; color: var(--color-neutral-800);
  cursor: pointer; margin-bottom: 18px;
}
.check input { width: 16px; height: 16px; accent-color: var(--color-accent); }

.verdict {
  border: 1px solid var(--color-divider); border-radius: var(--radius-sm);
  background: var(--color-surface); padding: 14px 16px;
}
.verdict__label {
  font-size: 11px; color: var(--color-neutral-500);
  letter-spacing: .08em; text-transform: uppercase; margin-bottom: 6px;
}
.verdict__title { font-family: var(--font-heading); font-size: 17px; margin-bottom: 6px; }
.verdict__row { display: flex; justify-content: space-between; padding: 2px 0; }
.verdict__row-label { font-size: 13px; color: var(--color-neutral-700); }
.verdict__row-value { font-size: 13px; }
.verdict__text { font-size: 12.5px; line-height: 1.6; color: var(--color-neutral-700); margin-top: 6px; }

.plot {
  background: #0b0f18; border-radius: var(--radius-sm);
  border: 1px solid var(--color-neutral-300); padding: 10px;
}
.plot canvas { width: 100%; height: auto; }

.stats { display: flex; flex-direction: column; gap: 10px; }
.stat {
  border: 1px solid var(--color-divider); border-left: 3px solid var(--color-accent-500);
  border-radius: var(--radius-sm); background: var(--color-surface); padding: 11px 14px;
  display: flex; justify-content: space-between; align-items: baseline;
}
.stat--alert { border-color: var(--hot); }
.stat__label { font-family: var(--font-heading); font-size: 13px; color: var(--color-neutral-700); }
.stat__value { font-size: 19px; color: var(--color-accent-700); }
.stat--alert .stat__value { color: var(--hot); }
.stats__verdict { font-size: 12.5px; line-height: 1.6; margin-top: 14px; color: var(--color-accent-700); }
.stats__verdict--alert { color: var(--hot); }

/* ── glossary ───────────────────────────────────────────────────────────── */
.glossary {
  display: grid; grid-template-columns: 220px 1fr;
  border: 1px solid var(--color-divider); border-radius: var(--radius-md); overflow: hidden;
}
.glossary__list { border-right: 1px solid var(--color-divider); }
.glossary__term {
  display: block; width: 100%; text-align: left; cursor: pointer;
  padding: 12px 16px; border: 0; border-bottom: 1px solid var(--color-divider);
  font-family: var(--font-heading); font-size: 15px;
  background: transparent; color: var(--color-text);
}
.glossary__term:hover { background: var(--color-accent-100); }
.glossary__term[aria-selected="true"] { background: var(--color-accent-100); color: var(--color-accent-700); }
.glossary__detail { padding: 22px 26px; }
.glossary__en { font-family: var(--font-heading); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--color-accent-700); }
.glossary__title { font-size: 24px; margin: 6px 0 10px; }
.glossary__def { font-size: 15px; line-height: 1.75; text-align: justify; margin: 0; color: var(--color-neutral-800); }
.glossary__fig { margin-top: 18px; }

/* glossary illustrations */
.fig {
  border: 1px solid var(--color-divider); border-radius: 6px; background: var(--color-surface);
  padding: 18px 16px; display: flex; align-items: center; justify-content: center;
  gap: 12px; flex-wrap: wrap; min-height: 120px;
}
.fig__row { display: flex; align-items: center; gap: 8px; }
.fig__box {
  border: 1px solid var(--color-neutral-300); border-top: 3px solid var(--color-accent-500);
  border-radius: 5px; background: var(--color-neutral-100); padding: 8px 12px;
  font-family: var(--font-heading); font-size: 12.5px; color: var(--color-neutral-800);
  text-align: center; line-height: 1.3;
}
.fig__box--hot { border-top-color: var(--hot); }
.fig__arrow {
  display: inline-flex; flex-direction: column; align-items: center; color: var(--color-accent);
  font-family: var(--font-heading); font-size: 19px; line-height: 1;
}
.fig__arrow-label { font-family: var(--font-mono); font-size: 10px; color: var(--color-neutral-500); white-space: nowrap; }
.fig__cap {
  width: 100%; text-align: center; font-family: var(--font-mono);
  font-size: 10px; color: var(--color-neutral-500); margin-top: 2px;
}
.fig__tick { width: 12px; height: 12px; border: 1px solid var(--color-accent-400); background: var(--color-accent-100); }
.fig__cell { width: 12px; height: 12px; border: 1px solid var(--color-neutral-300); }
.fig__cell--live { background: var(--color-neutral-300); }
.fig__cell--freed { border-style: dashed; border-color: var(--color-neutral-400); }
.fig__bar { width: 9px; background: var(--color-accent-400); }
.fig__bar--spike { background: var(--hot); }
.fig__dot { border-radius: 50%; }

/* ── learning index (hub) ───────────────────────────────────────────────── */
.hero--index { padding: 64px 0 26px; }
.hero__title--index { font-size: 60px; line-height: 1.04; letter-spacing: -.025em; }
.hero__lede--index { max-width: 60ch; }

.deck { display: flex; flex-direction: column; gap: 16px; margin-top: 8px; }
.deck__card {
  display: grid; grid-template-columns: 64px 1fr auto; gap: 22px; align-items: center;
  padding: 24px 26px; border: 1px solid var(--color-divider);
  border-left: 4px solid var(--color-accent-600); border-radius: var(--radius-md);
  background: var(--color-surface); box-shadow: var(--shadow-sm);
  color: var(--color-text); text-decoration: none;
}
.deck__card:hover { box-shadow: var(--shadow-md); border-color: var(--color-accent-400); color: var(--color-text); }
.deck__card:hover { border-left-color: var(--color-accent-600); }
.deck__card--hot, .deck__card--hot:hover { border-left-color: var(--hot); }
.deck__no { font-family: var(--font-heading); font-weight: 600; font-size: 30px; letter-spacing: -.02em; color: var(--color-accent-600); }
.deck__card--hot .deck__no { color: var(--hot); }
.deck__title { font-family: var(--font-heading); font-size: 22px; margin-bottom: 5px; }
.deck__desc { font-size: 14.5px; line-height: 1.6; color: var(--color-neutral-700); max-width: 60ch; }
.deck__tags { display: flex; gap: 7px; flex-wrap: wrap; margin-top: 12px; }
.deck__tag {
  font-size: 11px; color: var(--color-neutral-600);
  border: 1px solid var(--color-divider); border-radius: 99px; padding: 3px 10px;
}
.deck__arrow { font-family: var(--font-heading); font-size: 26px; color: var(--color-accent); align-self: center; }

.next {
  margin-top: 36px; padding: 22px 26px;
  border: 1px dashed var(--color-neutral-400); border-radius: var(--radius-md);
  background: var(--color-neutral-100);
}
.next__eyebrow { display: block; letter-spacing: .12em; color: var(--color-neutral-600); margin-bottom: 8px; }
.next__body { font-size: 15px; line-height: 1.7; color: var(--color-neutral-700); }

.footer {
  margin-top: 64px; padding-top: 22px; border-top: 1px solid var(--color-divider);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; align-items: baseline;
}
.footer__note { font-family: var(--font-heading); font-size: 14px; color: var(--color-neutral-600); }
.footer__meta { font-family: var(--font-heading); font-size: 12px; letter-spacing: .14em; color: var(--color-neutral-500); text-transform: uppercase; }

/* ── narrow screens ─────────────────────────────────────────────────────── */
@media (max-width: 680px) {
  .page { padding: 0 18px 72px; }
  .hero__title { font-size: 40px; }
  .section__title { font-size: 28px; }
  .lab__cols, .cardgrid, .glossary, .duo { grid-template-columns: 1fr; }
  .glossary__list { border-right: 0; border-bottom: 1px solid var(--color-divider); }
  .lab { padding: 18px; }
  /* Justified Japanese at phone widths stretches the inter-character spacing
     badly — ragged right reads better below this width. */
  .hero__lede, .prose, .aside, .callout__body, .glossary__def { text-align: left; }
  .hero__title--index { font-size: 42px; }
  .deck__card { grid-template-columns: 1fr; gap: 10px; padding: 20px; }
  .deck__arrow { display: none; }
}