:root {
  --lab-ink: #10211f;
  --lab-muted: #5d6b68;
  --lab-line: #dbe5e2;
  --lab-mist: #f4f8f7;
  --lab-teal: #176f67;
  --lab-teal-dark: #0d4c47;
  --lab-blue: #1856c9;
  --lab-orange: #f07c22;
  --lab-white: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body.recipe-study {
  margin: 0;
  color: var(--lab-ink);
  background: var(--lab-white);
  font-family: "Hiragino Sans", "Yu Gothic", "YuGothic", system-ui, sans-serif;
  line-height: 1.75;
}

.recipe-shell {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
  padding: 30px 0 120px;
}

.lab-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 0 14px;
  border-bottom: 1px solid var(--lab-line);
  color: var(--lab-muted);
  font-size: 12px;
  letter-spacing: .08em;
}

.lab-topbar strong { color: var(--lab-teal-dark); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(280px, .65fr);
  gap: 68px;
  padding: 84px 0 64px;
  align-items: end;
}

.eyebrow,
.section-label {
  margin: 0 0 14px;
  color: var(--lab-teal);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 780px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(50px, 7.2vw, 94px);
  font-weight: 500;
  letter-spacing: -.06em;
  line-height: .98;
}

.hero h1 em {
  color: var(--lab-orange);
  font-style: normal;
}

.hero-note {
  margin: 0;
  padding-left: 20px;
  border-left: 3px solid var(--lab-orange);
  color: var(--lab-muted);
  font-size: 15px;
}

.hero-note strong {
  display: block;
  margin-bottom: 8px;
  color: var(--lab-ink);
  font-size: 18px;
}

.tldr {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 22px;
  margin: 0 0 84px;
  padding: 22px 0;
  border-top: 1px solid var(--lab-ink);
  border-bottom: 1px solid var(--lab-line);
}

.tldr-label {
  color: var(--lab-teal);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .15em;
}

.tldr-body { font-size: 17px; }

.hero-figure { margin: 0 0 104px; }

.hero-figure-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--lab-line);
  background: var(--lab-white);
}

.hero-figure-frame::before {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 112px;
  height: 8px;
  background: var(--lab-teal);
  content: "";
}

.hero-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.figure-caption {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 18px;
  margin-top: 14px;
  color: var(--lab-muted);
  font-size: 12px;
}

.figure-caption b {
  color: var(--lab-teal-dark);
  letter-spacing: .08em;
}

.section {
  padding: 88px 0;
  border-top: 1px solid var(--lab-line);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(220px, .65fr) minmax(0, 1.35fr);
  gap: 56px;
  margin-bottom: 46px;
}

.section-heading h2 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(34px, 4.6vw, 60px);
  font-weight: 500;
  letter-spacing: -.045em;
  line-height: 1.12;
}

.section-intro {
  margin: 32px 0 0;
  max-width: 680px;
  color: var(--lab-muted);
  font-size: 15px;
}

.brief-grid,
.grammar-grid,
.use-grid,
.qc-grid {
  display: grid;
  gap: 1px;
  border: 1px solid var(--lab-line);
  background: var(--lab-line);
}

.brief-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grammar-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.use-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.qc-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.brief-card,
.grammar-card,
.use-card,
.qc-card {
  min-height: 170px;
  padding: 26px;
  background: var(--lab-white);
}

.brief-card span,
.grammar-card span,
.use-card span,
.qc-card span {
  display: block;
  margin-bottom: 15px;
  color: var(--lab-teal);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .12em;
}

.brief-card h3,
.grammar-card h3,
.use-card h3,
.qc-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.45;
}

.brief-card p,
.grammar-card p,
.use-card p,
.qc-card p {
  margin: 0;
  color: var(--lab-muted);
  font-size: 13px;
}

.translation {
  display: grid;
  grid-template-columns: 160px repeat(3, 1fr);
  border-top: 1px solid var(--lab-ink);
}

.translation > div {
  min-height: 140px;
  padding: 22px 20px;
  border-right: 1px solid var(--lab-line);
  border-bottom: 1px solid var(--lab-line);
}

.translation > div:nth-child(4n) { border-right: 0; }

.translation .row-head {
  color: var(--lab-muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
}

.translation h3 { margin: 0; font-size: 22px; }
.translation p { margin: 0; color: var(--lab-muted); font-size: 13px; }
.translation strong { color: var(--lab-orange); }

.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.comparison figure { margin: 0; }

.comparison img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  border: 1px solid var(--lab-line);
  background: var(--lab-white);
}

.comparison figcaption { margin-top: 12px; color: var(--lab-muted); font-size: 12px; }
.comparison figcaption b { display: block; margin-bottom: 4px; color: var(--lab-ink); }

.prompt-block {
  margin: 0;
  padding: 0;
  border: 1px solid var(--lab-line);
  background: var(--lab-white);
}

.prompt-block summary {
  padding: 22px 26px;
  color: var(--lab-teal-dark);
  cursor: pointer;
  font-weight: 700;
  list-style-position: inside;
}

.prompt-block pre {
  overflow-x: auto;
  max-height: 620px;
  margin: 0;
  padding: 28px;
  border-top: 1px solid var(--lab-line);
  background: #f7faf9;
  color: #17312e;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 12px;
  line-height: 1.75;
}

.recipe-note {
  margin-top: 26px;
  padding: 22px 26px;
  border-left: 4px solid var(--lab-orange);
  background: var(--lab-mist);
  font-size: 14px;
}

.recipe-note strong { color: var(--lab-teal-dark); }

.qc-card strong.score {
  display: block;
  margin: 2px 0 12px;
  color: var(--lab-teal-dark);
  font-family: "Yu Mincho", serif;
  font-size: 42px;
  font-weight: 500;
  line-height: 1;
}

.qc-card.is-warn { box-shadow: inset 0 5px 0 var(--lab-orange); }
.qc-card.is-pass { box-shadow: inset 0 5px 0 var(--lab-teal); }

.footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 30px;
  padding-top: 34px;
  border-top: 1px solid var(--lab-ink);
  color: var(--lab-muted);
  font-size: 11px;
}

.footer a { color: var(--lab-teal-dark); }

.batch-intro {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 1px;
  margin-bottom: 54px;
  border: 1px solid var(--lab-line);
  background: var(--lab-line);
}

.batch-intro > div {
  padding: 30px;
  background: var(--lab-white);
}

.batch-intro blockquote {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.45;
}

.batch-intro p {
  margin: 0;
  color: var(--lab-muted);
  font-size: 13px;
}

.recipe-legend {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 80px;
}

.recipe-chip {
  padding: 18px 20px;
  border-top: 4px solid var(--lab-teal);
  background: var(--lab-mist);
}

.recipe-chip:nth-child(2) { border-color: var(--lab-blue); }
.recipe-chip:nth-child(3) { border-color: var(--lab-orange); }

.recipe-chip b { display: block; margin-bottom: 4px; font-size: 13px; }
.recipe-chip span { color: var(--lab-muted); font-size: 11px; }

.batch-chapter { margin-top: 94px; }

.chapter-head {
  display: grid;
  grid-template-columns: 110px 1fr minmax(220px, .6fr);
  gap: 28px;
  align-items: end;
  margin-bottom: 30px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--lab-ink);
}

.chapter-index {
  color: var(--lab-orange);
  font-family: "Yu Mincho", serif;
  font-size: 64px;
  line-height: 1;
}

.chapter-head h3 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 500;
  letter-spacing: -.04em;
  line-height: 1.15;
}

.chapter-head p { margin: 0; color: var(--lab-muted); font-size: 13px; }

.art-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px 24px;
}

.art-card {
  overflow: hidden;
  border: 1px solid var(--lab-line);
  background: var(--lab-white);
}

.art-card.is-cover { grid-column: 1 / -1; }

.art-card figure { margin: 0; background: #f8fbfa; }

.art-card img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #fff;
}

.art-card-body { padding: 22px 24px 24px; }

.art-card-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.art-id {
  color: var(--lab-teal-dark);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .12em;
}

.art-recipe {
  padding: 4px 8px;
  border: 1px solid var(--lab-line);
  color: var(--lab-muted);
  font-size: 9px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.art-card h4 { margin: 0 0 9px; font-size: 19px; line-height: 1.45; }
.art-card p { margin: 0; color: var(--lab-muted); font-size: 12px; }

.art-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 18px;
}

.art-facts span {
  padding-top: 9px;
  border-top: 1px solid var(--lab-line);
  color: var(--lab-muted);
  font-size: 10px;
}

.art-facts b { display: block; color: var(--lab-ink); font-size: 12px; }

.art-qc {
  margin-top: 16px !important;
  padding-left: 12px;
  border-left: 3px solid var(--lab-teal);
}

.art-qc.is-warn { border-color: var(--lab-orange); }

.prompt-mini { margin-top: 16px; border-top: 1px solid var(--lab-line); }
.prompt-mini summary { padding-top: 12px; color: var(--lab-teal-dark); cursor: pointer; font-size: 11px; font-weight: 700; }
.prompt-mini p { padding-top: 10px; font-family: ui-monospace, "SFMono-Regular", Menlo, monospace; font-size: 10px; line-height: 1.7; }

.batch-rule {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 70px;
  border: 1px solid var(--lab-line);
  background: var(--lab-line);
}

.batch-rule div { padding: 22px; background: var(--lab-white); }
.batch-rule b { display: block; margin-bottom: 8px; color: var(--lab-teal-dark); font-size: 13px; }
.batch-rule span { color: var(--lab-muted); font-size: 11px; }

@media (max-width: 900px) {
  .recipe-shell { width: min(100% - 32px, 760px); padding-top: 72px; }
  .hero, .section-heading { grid-template-columns: 1fr; gap: 28px; }
  .hero { padding-top: 56px; }
  .grammar-grid, .qc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .use-grid { grid-template-columns: 1fr; }
  .chapter-head { grid-template-columns: 86px 1fr; }
  .chapter-head p { grid-column: 2; }
  .batch-rule { grid-template-columns: repeat(2, 1fr); }
  .translation { grid-template-columns: 112px 1fr; }
  .translation > div:nth-child(4n) { border-right: 1px solid var(--lab-line); }
  .translation > div:nth-child(2n) { border-right: 0; }
}

@media (max-width: 640px) {
  .recipe-shell { width: calc(100% - 24px); }
  .lab-topbar span { display: none; }
  .hero { padding: 44px 0 42px; }
  .hero h1 { font-size: 48px; }
  .tldr { grid-template-columns: 1fr; gap: 8px; margin-bottom: 58px; }
  .figure-caption, .brief-grid, .grammar-grid, .qc-grid, .comparison, .batch-intro, .recipe-legend, .art-grid { grid-template-columns: 1fr; }
  .section { padding: 62px 0; }
  .section-heading { margin-bottom: 30px; }
  .translation { grid-template-columns: 88px 1fr; }
  .chapter-head { grid-template-columns: 56px 1fr; gap: 14px; }
  .chapter-index { font-size: 46px; }
  .chapter-head p { grid-column: 1 / -1; }
  .art-card.is-cover { grid-column: auto; }
  .batch-rule { grid-template-columns: 1fr; }
  .brief-card, .grammar-card, .use-card, .qc-card { min-height: 0; }
  .footer { grid-template-columns: 1fr; }
}