/* Proportion correction for the two product pages only.
   Keep legacy/legal styles intact. Figures preserve their intrinsic ratio. */
:is(.product-page, .principles-page) {
  --ink: #25332f;
  --muted: #5a6862;
  --red: #bd3048;
  --green: #18765c;
  --yellow: #855d08;
  --line: #dfe5e1;
  --paper: #f7f8fa;
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: break-word;
}

:is(.product-page, .principles-page) :is(.wrap, .page-width) {
  width: min(1120px, calc(100% - 64px));
  margin-inline: auto;
}

:is(.product-page, .principles-page) h1 {
  font-size: clamp(32px, 3.6vw, 46px);
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -1px;
  margin: 0;
}

:is(.product-page, .principles-page) h2 {
  font-size: clamp(26px, 2.7vw, 32px);
  font-weight: 650;
  line-height: 1.4;
  letter-spacing: -.6px;
}

:is(.product-page, .principles-page) h3 {
  font-size: 19px;
  line-height: 1.5;
}

:is(.product-page, .principles-page) .eyebrow {
  font-size: 11px;
  letter-spacing: 1.3px;
  line-height: 1.6;
  margin-bottom: 16px;
}

:is(.product-page, .principles-page) .site-header {
  background: rgba(247, 248, 250, .98);
}

:is(.product-page, .principles-page) :is(.nav, .navigation) {
  min-height: 72px;
  gap: 20px;
}

:is(.product-page, .principles-page) .brand {
  gap: 10px;
  min-height: 44px;
  flex-shrink: 0;
  font-size: 19px;
  line-height: 1.3;
}

:is(.product-page, .principles-page) .brand img {
  display: block;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  border-radius: 10px;
}

.principles-page .brand-detail { display: none; }

:is(.product-page, .principles-page) .nav-links {
  flex-wrap: nowrap;
  align-items: center;
  gap: 24px;
}

:is(.product-page, .principles-page) .nav-links a {
  min-height: 44px;
  font-size: 14px;
  white-space: nowrap;
}

:is(.product-page, .principles-page) .hero {
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: 48px;
  align-items: center;
  padding-block: 48px 40px;
}

:is(.product-page, .principles-page) .hero > * { min-width: 0; }

:is(.product-page, .principles-page) :is(.hero-intro, .lead) {
  font-size: 16px;
  line-height: 1.85;
  max-width: 42em;
  margin-block: 20px 24px;
}

:is(.product-page, .principles-page) .button {
  min-height: 48px;
  padding: 10px 20px;
  font-size: 14px;
  line-height: 1.6;
  border-radius: 12px;
}

:is(.product-page, .principles-page) .section { padding-block: 56px; }

.product-page .actions { margin-block: 24px 20px; }
.product-page .status { font-size: 12px; padding: 5px 11px; }
.product-page .visual { width: 100%; max-width: 440px; justify-self: end; padding: 24px; border-radius: 24px; }
.product-page .visual-heading { gap: 12px; margin-bottom: 20px; }
.product-page .visual-heading img { width: 48px; height: 48px; flex: 0 0 48px; border-radius: 13px; }
.product-page .visual-heading strong { font-size: 20px; }
.product-page .visual-heading p { font-size: 12px; }
.product-page .two-metrics { gap: 12px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.product-page .metric { padding: 18px 14px; border-radius: 16px; }
.product-page .metric .symbol { font-size: 25px; line-height: 1.3; margin-bottom: 10px; }
.product-page .metric strong { font-size: 16px; }
.product-page .metric p { font-size: 13px; line-height: 1.7; }
.product-page .visual-caption { font-size: 12px; line-height: 1.8; margin-top: 18px; }
.product-page .grid { gap: 20px; }
.product-page .card { padding: 24px; border-radius: 18px; }
.product-page .card p:not(.step) { font-size: 15px; line-height: 1.8; }
.product-page .step { font-size: 12px; margin-bottom: 12px; }
.product-page .section > p:not(.eyebrow):not(.notice) { max-width: 82ch; }
.product-page .paper { padding: 24px 28px; border-radius: 0 16px 16px 0; }
.product-page .paper-title { font-size: 20px; max-width: 70ch; }
.product-page .notice { font-size: 14px; line-height: 1.85; padding: 20px 24px; border-radius: 14px; }
.product-page .english { font-size: 15px; }
.product-page .footer { padding-block: 24px; }

.principles-page .hero-boundary { font-size: 13px; line-height: 1.8; margin-top: 20px; }
.principles-page .placement-figure { width: 100%; max-width: 420px; justify-self: end; border-radius: 20px; }
.principles-page .figure-heading { padding: 13px 18px; font-size: 12px; }
.principles-page .placement-image { width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: contain; }
.principles-page .placement-figure figcaption { padding: 16px 18px; }
.principles-page .placement-figure figcaption strong { font-size: 14px; }
.principles-page .placement-figure figcaption > span { font-size: 12px; line-height: 1.7; }
.principles-page .figure-index { font-size: 10px; }
.principles-page .measurement-strip { padding-block: 22px; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.principles-page .measurement-strip > div { padding-left: 24px; }
.principles-page .measurement-strip > div:first-child { padding-left: 0; }
.principles-page .strip-title { font-size: 12px; }
.principles-page .strip-value { font-size: 30px; line-height: 1.55; }
.principles-page .strip-value span { font-size: 13px; }
.principles-page .strip-detail { font-size: 12px; line-height: 1.7; }
.principles-page .strip-note .strip-value { font-size: 17px; line-height: 2.75; }
.principles-page .strip-note .strip-value span { font-size: 19px; }
.principles-page .chapter-nav { padding-block: 12px; }
.principles-page .chapter-nav a { font-size: 13px; }
.principles-page .section-heading { grid-template-columns: 1fr 1fr; gap: 48px; margin-bottom: 28px; }
.principles-page .section-heading > p { font-size: 16px; line-height: 1.8; max-width: none; }
.principles-page .section-heading .eyebrow { margin-bottom: 14px; }
.principles-page .signal-panel { padding-inline: 24px; border-radius: 18px; }
.principles-page .panel-top { font-size: 13px; padding-block: 16px; }
.principles-page .tag { font-size: 11px; }
.principles-page .signal-row { grid-template-columns: 230px minmax(0, 1fr); min-height: 126px; gap: 24px; padding-block: 10px; }
.principles-page .signal-row h3 { font-size: 17px; }
.principles-page .signal-label p { font-size: 13px; }
.principles-page .signal-label .label-code { font-size: 10px; margin-bottom: 5px; }
.principles-page .signal-row img { width: 100%; height: 100px; object-fit: contain; }
.principles-page .split-caption { font-size: 12px; }
.principles-page .figure-note { font-size: 13px; line-height: 1.8; padding-block: 16px; }
.principles-page .definition-pair { gap: 40px; font-size: 14px; }
.principles-page .definition-pair strong { font-size: 15px; }
.principles-page .pipeline { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; margin-block: 32px 28px; }
.principles-page .pipeline li { display: block; padding-top: 18px; }
.principles-page .step-number { margin-bottom: 14px; font-size: 13px; }
.principles-page .pipeline h3 { font-size: 18px; }
.principles-page .pipeline p { font-size: 15px; line-height: 1.8; margin-top: 10px; }
.principles-page .step-detail { font-size: 12px; margin-top: 14px; }
.principles-page .inline-warning { font-size: 14px; line-height: 1.8; padding: 18px 20px; }
.principles-page .app-section { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: center; }
.principles-page .app-copy > p:not(.eyebrow) { font-size: 16px; line-height: 1.8; margin-top: 18px; }
.principles-page .app-copy .small-note { font-size: 13px !important; }
.principles-page .app-features { margin-top: 24px; }
.principles-page .app-features li { padding-block: 15px; gap: 14px; }
.principles-page .app-features strong { font-size: 16px; }
.principles-page .app-features p { font-size: 14px; line-height: 1.8; }
.principles-page .screenshots { display: flex; gap: 20px; width: 100%; max-width: 500px; padding: 20px; justify-content: center; justify-self: end; align-items: start; border-radius: 20px; }
.principles-page .screen-figure { flex: 1 1 0; width: 100%; min-width: 0; max-width: 220px; }
.principles-page .source-screen { margin-top: 0; }
.principles-page .screen-figure a { border-width: 3px; border-radius: 23px; }
.principles-page .screen-figure img { width: 100%; height: auto; aspect-ratio: 1206 / 2622; object-fit: contain; }
.principles-page .screen-figure figcaption { padding-top: 12px; }
.principles-page .screen-figure strong { font-size: 13px; }
.principles-page .screen-figure figcaption > span:last-child { font-size: 12px; }
.principles-page .screen-figure .figure-index { font-size: 10px; }
.principles-page .publication { grid-template-columns: 170px minmax(0, 1fr); margin-top: 28px; }
.principles-page .publication-mark { padding: 26px; }
.principles-page .publication-mark strong { font-size: 38px; margin-top: 22px; }
.principles-page .publication-copy { padding: 26px 30px; }
.principles-page .publication-copy h3 { font-size: 22px; }
.principles-page .citation { font-size: 13px; line-height: 1.85; }
.principles-page .publication-links .button { font-size: 14px; }
.principles-page .text-link { font-size: 14px; }
.principles-page .research-summary { font-size: 15px; line-height: 1.85; }
.principles-page .comparison-grid { gap: 30px; }
.principles-page .comparison-grid > article + article { padding-left: 30px; }
.principles-page .comparison-grid h3 { font-size: 21px; }
.principles-page .comparison-grid ul { font-size: 15px; line-height: 1.8; }
.principles-page .research-footnote { font-size: 13px; line-height: 1.8; }
.principles-page .limits-section { grid-template-columns: 1fr 1fr; gap: 48px; }
.principles-page .safety-note { font-size: 14px; line-height: 1.8; padding: 20px; }
.principles-page .safety-note strong { font-size: 15px; }
.principles-page .faq summary { font-size: 16px; min-height: 68px; }
.principles-page .faq details > p { font-size: 15px; line-height: 1.8; }
.principles-page .english-section { padding-block: 36px 44px; }
.principles-page .english-section h2 { font-size: 27px; }
.principles-page .english-columns { gap: 40px; }
.principles-page .english-columns p { font-size: 15px; line-height: 1.85; }
.principles-page .footer-top p { font-size: 13px; }
.principles-page .footer-bottom { font-size: 12px; }

@media (max-width: 1000px) {
  :is(.product-page, .principles-page) :is(.wrap, .page-width) { width: calc(100% - 48px); }
  :is(.product-page, .principles-page) .hero { gap: 28px; padding-block: 36px; }
  :is(.product-page, .principles-page) h1 { font-size: clamp(30px, 3.7vw, 38px); }
  .product-page .visual { padding: 20px; }
  .product-page .metric { padding: 16px 12px; }
  .product-page .metric strong { font-size: 15px; }
  .product-page .grid { gap: 16px; }
  .product-page .card { padding: 20px; }
  .principles-page .section-heading { gap: 28px; }
  .principles-page .pipeline { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .principles-page .app-section { grid-template-columns: 1fr; gap: 28px; }
  .principles-page .screenshots { gap: 20px; padding: 20px; justify-self: center; }
  .principles-page .measurement-strip > div { padding-left: 16px; }
  .principles-page .limits-section { gap: 28px; }
}

@media (max-width: 760px) {
  :is(.product-page, .principles-page) .hero { grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: 24px; }
  :is(.product-page, .principles-page) h1 { font-size: 30px; }
  :is(.product-page, .principles-page) .nav-links { gap: 16px; }
  :is(.product-page, .principles-page) .nav-links a { font-size: 13px; }
  :is(.product-page, .principles-page) .hero :is(.lead, .hero-intro) { font-size: 15px; }
  .product-page .visual { padding: 18px; }
  .product-page .visual-heading { gap: 10px; }
  .product-page .visual-heading img { width: 40px; height: 40px; flex-basis: 40px; }
  .product-page .two-metrics { grid-template-columns: 1fr; gap: 10px; }
  .product-page .metric { display: grid; grid-template-columns: 25px 1fr; column-gap: 10px; padding: 12px; }
  .product-page .metric .symbol { grid-row: 1 / 3; font-size: 22px; margin: 0; }
  .product-page .metric p { grid-column: 2; margin-top: 4px; font-size: 12px; }
  .product-page .visual-caption { font-size: 12px; margin-top: 14px; }
  .product-page .grid { grid-template-columns: 1fr; }
  .principles-page .figure-heading { padding: 10px 14px; }
  .principles-page .placement-figure figcaption { padding: 12px 14px; }
  .principles-page .placement-figure figcaption strong { font-size: 13px; }
  .principles-page .measurement-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; }
  .principles-page .measurement-strip > div:nth-child(3) { border-left: 1px solid var(--line); padding-left: 16px; }
  .principles-page .strip-value { font-size: 27px; }
  .principles-page .strip-note .strip-value { font-size: 15px; }
  .principles-page .strip-detail { font-size: 11px; }
  .principles-page .chapter-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; }
  .principles-page .section-heading, .principles-page .limits-section { grid-template-columns: 1fr; gap: 20px; }
  .principles-page .signal-row { grid-template-columns: 190px minmax(0, 1fr); gap: 20px; }
  .principles-page .definition-pair { grid-template-columns: 1fr 1fr; gap: 24px; }
  .principles-page .app-section { grid-template-columns: 1fr; gap: 28px; }
  .principles-page .screenshots { max-width: 500px; justify-self: center; gap: 20px; padding: 20px; }
  .principles-page .publication { grid-template-columns: 140px minmax(0, 1fr); }
  .principles-page .publication-mark { flex-direction: column; align-items: flex-start; justify-content: center; gap: 12px; padding: 20px; }
  .principles-page .publication-mark strong { margin: 0; font-size: 32px; }
  .principles-page .publication-copy { padding: 22px; }
  .principles-page .comparison-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .principles-page .comparison-grid > article + article { padding-top: 0; padding-left: 24px; border-top: 0; border-left: 1px solid var(--line); }
  .principles-page .english-columns { grid-template-columns: 1fr; gap: 16px; }
}

@media (max-width: 600px) {
  :is(.product-page, .principles-page) :is(.wrap, .page-width) { width: calc(100% - 40px); }
  :is(.product-page, .principles-page) :is(.nav, .navigation) { min-height: 64px; gap: 12px; }
  :is(.product-page, .principles-page) .brand { gap: 8px; font-size: 18px; }
  :is(.product-page, .principles-page) .brand img { width: 32px; height: 32px; flex-basis: 32px; border-radius: 9px; }
  :is(.product-page, .principles-page) .nav-links { gap: 12px; }
  :is(.product-page, .principles-page) .nav-links a { font-size: 12px; min-width: 30px; }
  .product-page .nav-links a:first-child { display: none; }
  :is(.product-page, .principles-page) .hero { grid-template-columns: 1fr; gap: 26px; padding-block: 28px 32px; }
  :is(.product-page, .principles-page) h1 { font-size: clamp(29px, 7.7vw, 34px); letter-spacing: -.7px; }
  :is(.product-page, .principles-page) h2 { font-size: 27px; letter-spacing: -.4px; }
  :is(.product-page, .principles-page) .hero .eyebrow { font-size: 10px; margin-bottom: 14px; }
  :is(.product-page, .principles-page) :is(.hero-intro, .lead) { font-size: 16px; margin-block: 16px 20px; }
  :is(.product-page, .principles-page) .section { padding-block: 36px; }
  .product-page .visual { max-width: 400px; justify-self: center; padding: 20px; border-radius: 20px; }
  .product-page .two-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .product-page .metric { display: block; padding: 16px 12px; }
  .product-page .metric .symbol { margin-bottom: 10px; }
  .product-page .metric p { margin-top: 6px; }
  .product-page .paper { padding: 20px; }
  .product-page .paper-title { font-size: 18px; }
  .product-page .notice { padding: 18px; }
  .principles-page .hero-boundary { font-size: 12px; margin-top: 16px; }
  .principles-page .placement-figure { max-width: 340px; justify-self: center; }
  .principles-page .measurement-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 0; padding-block: 20px; }
  .principles-page .measurement-strip > div:nth-child(3) { border-left: 0; padding-left: 0; }
  .principles-page .strip-value { font-size: 28px; }
  .principles-page .strip-note .strip-value { font-size: 16px; }
  .principles-page .strip-detail { font-size: 12px; }
  .principles-page .chapter-nav a { font-size: 12px; gap: 8px; }
  .principles-page .section-heading > p { font-size: 15px; }
  .principles-page .signal-panel { padding-inline: 16px; }
  .principles-page .panel-top { font-size: 12px; gap: 8px; }
  .principles-page .tag { font-size: 10px; padding-inline: 6px; white-space: nowrap; }
  .principles-page .signal-row { grid-template-columns: 1fr; gap: 4px; min-height: 0; padding-block: 18px 8px; }
  .principles-page .signal-row img { height: 76px; }
  .principles-page .signal-row h3 { font-size: 16px; }
  .principles-page .signal-label p { font-size: 12px; }
  .principles-page .figure-note { font-size: 12px; }
  .principles-page .definition-pair { grid-template-columns: 1fr; gap: 18px; font-size: 13px; }
  .principles-page .definition-pair strong { font-size: 14px; }
  .principles-page .pipeline { grid-template-columns: 1fr; gap: 20px; margin-block: 24px; }
  .principles-page .pipeline li { display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 0 12px; }
  .principles-page .pipeline .step-number { grid-column: 1; grid-row: 1 / 4; margin: 2px 0 0; font-size: 12px; }
  .principles-page .pipeline h3, .principles-page .pipeline p, .principles-page .pipeline .step-detail { grid-column: 2; }
  .principles-page .pipeline p { font-size: 14px; margin-top: 8px; }
  .principles-page .step-detail { font-size: 12px; margin-top: 10px; }
  .principles-page .inline-warning { align-items: flex-start; padding: 16px; gap: 12px; font-size: 13px; }
  .principles-page .app-copy > p:not(.eyebrow) { font-size: 15px; }
  .principles-page .app-features strong { font-size: 15px; }
  .principles-page .app-features p { font-size: 14px; }
  .principles-page .screenshots { justify-content: flex-start; padding: 18px 16px; gap: 18px; overflow-x: auto; overscroll-behavior-inline: contain; scroll-snap-type: x proximity; scroll-padding-inline: 16px; }
  .principles-page .screen-figure { flex: 0 0 min(72vw, 240px); width: min(72vw, 240px); max-width: 240px; scroll-snap-align: start; }
  .principles-page .screen-figure figcaption > span:last-child { font-size: 12px; }
  .principles-page .publication { grid-template-columns: 1fr; }
  .principles-page .publication-mark { flex-direction: row; align-items: center; justify-content: space-between; padding: 16px 20px; }
  .principles-page .publication-mark strong { font-size: 27px; }
  .principles-page .publication-copy { padding: 20px; }
  .principles-page .publication-copy h3 { font-size: 20px; }
  .principles-page .publication-links { gap: 12px 18px; }
  .principles-page .publication-links .button { font-size: 13px; }
  .principles-page .research-summary { font-size: 14px; }
  .principles-page .comparison-grid { grid-template-columns: 1fr; gap: 24px; }
  .principles-page .comparison-grid > article + article { padding: 24px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .principles-page .comparison-grid h3 { font-size: 20px; }
  .principles-page .comparison-grid ul { font-size: 14px; }
  .principles-page .research-footnote { font-size: 12px; }
  .principles-page .faq summary { font-size: 15px; }
  .principles-page .faq details > p { font-size: 14px; }
  .principles-page .safety-note { font-size: 13px; padding: 18px; }
  .principles-page .safety-note strong { font-size: 14px; }
  .principles-page .english-section h2 { font-size: 24px; }
  .principles-page .english-columns p { font-size: 14px; }
  .principles-page .footer-top { gap: 16px; }
}

@media (max-width: 360px) {
  :is(.product-page, .principles-page) :is(.wrap, .page-width) { width: calc(100% - 32px); }
  :is(.product-page, .principles-page) h1 { font-size: 29px; }
  :is(.product-page, .principles-page) .nav-links { gap: 8px; }
  .principles-page .hero .eyebrow { letter-spacing: .9px; }
}

@media print {
  .principles-page .screenshots { overflow: visible; max-width: 500px; }
  .principles-page .screen-figure { flex: 1 1 0; max-width: 220px; }
}