:root {
  --paper: #ffffff;
  --ink: #0a0a0a;
  --body: #34373a;
  --quiet: #62666b;
  --muted: #6f7378;
  --rule: #d8dade;
  --rule-soft: rgba(116, 120, 125, 0.55);
  --rule-strong: #74787d;
  --panel: #f3f4f4;
  --powder: #edf2ff;
  --blue: #2457d6;
  --scrim: rgba(10, 10, 10, 0.74);
  --max: 1440px;
  --narrow: 880px;
  --pad: clamp(22px, 4vw, 64px);
  --section: clamp(58px, 6.5vw, 96px);
  --z-content: 1;
  --z-subnav: 30;
  --z-tray: 40;
  --z-header: 50;
  --z-skip: 100;
  color-scheme: light;
  font-family: Helvetica, Arial, sans-serif;
  font-synthesis: none;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.48;
  text-rendering: optimizeLegibility;
}

body:has(dialog[open]) {
  overflow: hidden;
}

::selection {
  background: var(--powder);
  color: var(--ink);
}

[hidden] {
  display: none !important;
}

img,
svg {
  display: block;
  max-width: 100%;
}

button,
input,
select,
textarea {
  font: inherit;
}

input::placeholder,
textarea::placeholder {
  color: var(--quiet);
  opacity: 1;
}

button,
select {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

p,
h1,
h2,
h3,
dl,
dd,
figure,
blockquote {
  margin: 0;
}

h1,
h2,
h3,
strong {
  font-weight: 700;
}

h1,
h2,
h3 {
  letter-spacing: -0.04em;
  line-height: 0.98;
  text-wrap: balance;
}

p,
li,
dd,
figcaption {
  text-wrap: pretty;
}

h1 {
  font-size: clamp(3.25rem, 6.2vw, 5rem);
}

h2 {
  font-size: clamp(2.35rem, 4.7vw, 3.65rem);
}

h3 {
  font-size: clamp(1.55rem, 2.5vw, 2.35rem);
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: var(--z-skip);
  padding: 10px 14px;
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: none;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.page-shell,
.page-shell--narrow {
  width: min(calc(100% - (var(--pad) * 2)), var(--max));
  margin-inline: auto;
}

.page-shell--narrow {
  width: min(calc(100% - (var(--pad) * 2)), var(--narrow));
}

.section-pad {
  padding-block: var(--section);
}

.eyebrow {
  display: block;
  margin-bottom: 14px;
  color: var(--quiet);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.025em;
  line-height: 1.3;
}

.section-heading {
  margin-bottom: clamp(34px, 4vw, 56px);
}

.section-heading--center {
  text-align: left;
}

.section-heading p,
.tool-hero__copy,
.peptide-hero__content > p,
.calculator-heading > p {
  max-width: 700px;
  margin-top: 22px;
  color: var(--quiet);
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 68px;
  padding-inline: var(--pad);
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  display: inline-flex;
  gap: 11px;
  align-items: center;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.wordmark__mark {
  display: grid;
  width: 31px;
  height: 31px;
  place-items: center;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.67rem;
  letter-spacing: -0.04em;
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: clamp(14px, 2.2vw, 34px);
}

.site-nav__link {
  position: relative;
  padding-block: 22px;
  color: var(--quiet);
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav__link::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: var(--blue);
  content: '';
  transform: scaleX(0);
  transform-origin: left;
}

.site-nav__link:hover,
.site-nav__link[aria-current='page'] {
  color: var(--ink);
}

.site-nav__link[aria-current='page']::after {
  transform: scaleX(1);
}

.header-ai,
.nav-toggle {
  min-height: 44px;
  padding: 0 15px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 0;
  font-size: 0.78rem;
  font-weight: 700;
}

.nav-toggle {
  display: none;
}

.button {
  display: inline-flex;
  min-height: 46px;
  padding: 0 18px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--ink);
  border-radius: 0;
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
}

.button--black,
.button--blue {
  background: var(--ink);
  color: var(--paper);
}

.button--outline,
.button--soft {
  background: transparent;
  color: var(--ink);
}

.button--small {
  min-height: 44px;
  padding-inline: 13px;
  font-size: 0.78rem;
}

.button:hover,
.header-ai:hover {
  background: var(--paper);
  color: var(--ink);
}

.text-link,
.text-button,
.article-card__link {
  padding: 0;
  background: none;
  color: var(--ink);
  border: 0;
  border-bottom: 1px solid currentColor;
  border-radius: 0;
  font-size: 0.83rem;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
}

.text-link:hover,
.text-button:hover,
.article-card__link:hover {
  color: var(--blue);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  margin-top: 32px;
}

.home-hero {
  position: relative;
  min-height: clamp(570px, 72vh, 760px);
  overflow: hidden;
  border-bottom: 1px solid var(--rule);
}

.home-hero__art {
  position: absolute;
  top: -9%;
  right: -7%;
  width: min(64vw, 980px);
  height: 118%;
  object-fit: contain;
  opacity: 0.09;
  filter: grayscale(1) contrast(0.85);
  pointer-events: none;
}

.home-hero__content {
  position: relative;
  z-index: var(--z-content);
  display: flex;
  min-height: inherit;
  padding-block: clamp(76px, 10vw, 132px);
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  text-align: left;
}

.home-hero h1 {
  max-width: 930px;
  font-size: clamp(3.6rem, 6.6vw, 6rem);
}

.home-hero__content > p {
  max-width: 650px;
  margin-top: 24px;
  color: var(--quiet);
  font-size: clamp(1.08rem, 1.5vw, 1.25rem);
}

.ai-composer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  width: min(100%, 790px);
  margin-top: 38px;
  background: var(--paper);
  border: 1px solid var(--ink);
}

.ai-composer input {
  min-width: 0;
  height: 58px;
  padding: 0 18px;
  background: transparent;
  border: 0;
  color: var(--ink);
  outline: 0;
}

.ai-composer button {
  padding-inline: 22px;
  background: var(--ink);
  color: var(--paper);
  border: 0;
  border-left: 1px solid var(--ink);
  font-weight: 700;
}

.ai-composer:focus-within {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.ai-composer__meta,
.trust-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 15px;
  color: var(--quiet);
  font-size: 0.75rem;
}

.ai-composer__meta span:not(:last-child)::after,
.trust-line span:not(:last-child)::after {
  margin-left: 22px;
  color: var(--rule-strong);
  content: '·';
}

.intent-bar {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.intent-bar a {
  display: flex;
  min-height: 92px;
  padding: 20px clamp(14px, 2vw, 28px);
  gap: 14px;
  align-items: center;
  border-right: 1px solid var(--rule);
  text-decoration: none;
}

.intent-bar a:last-child {
  border-right: 0;
}

.intent-bar span {
  color: var(--muted);
  font-size: 0.7rem;
}

.intent-bar strong {
  font-size: 0.83rem;
  line-height: 1.25;
}

.intent-bar a:hover {
  box-shadow: inset 0 -2px var(--blue);
}

.ranking-section {
  background: var(--paper);
}

.ranking-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.ranking-feature {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr) minmax(190px, 250px);
  gap: 30px;
  padding: clamp(28px, 4vw, 54px) clamp(0px, 3vw, 42px) clamp(28px, 4vw, 54px) 0;
  border-right: 1px solid var(--rule);
}

.ranking-feature__index {
  color: var(--quiet);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

.ranking-feature__meta {
  display: flex;
  gap: 16px;
  margin-bottom: 22px;
  color: var(--quiet);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ranking-feature__main h3 {
  font-size: clamp(2.6rem, 4vw, 4.2rem);
}

.ranking-feature__main > p {
  max-width: 630px;
  margin-top: 18px;
  color: var(--quiet);
  font-size: 1.05rem;
}

.ranking-feature__facts {
  align-self: start;
  border-top: 1px solid var(--rule);
}

.ranking-feature__facts div,
.profile-glance div,
.profile-snapshot-grid > div {
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
}

.ranking-feature__facts dt,
.profile-glance dt,
.profile-snapshot-grid span,
.compound-card__facts dt {
  color: var(--quiet);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ranking-feature__facts dd,
.profile-glance dd {
  margin-top: 5px;
  font-size: 0.88rem;
  line-height: 1.35;
}

.ranking-feature > .button {
  grid-column: 2;
  justify-self: start;
}

.ranking-list {
  display: flex;
  flex-direction: column;
}

.ranking-list__item {
  display: grid;
  grid-template-columns: 42px 1fr;
  min-height: 68px;
  padding: 0 20px;
  gap: 12px;
  align-items: center;
  background: transparent;
  color: var(--ink);
  border: 0;
  border-bottom: 1px solid var(--rule);
  text-align: left;
}

.ranking-list__item:last-child {
  border-bottom: 0;
}

.ranking-list__item span {
  color: var(--quiet);
  font-size: 0.72rem;
}

.ranking-list__item strong {
  font-size: 0.88rem;
}

.ranking-list__item[data-selected='true'] {
  box-shadow: inset 3px 0 var(--blue);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 20px 0 0;
  padding: 0;
  color: var(--quiet);
  list-style: none;
  font-size: 0.75rem;
  font-weight: 700;
}

.tag-list li:not(:last-child)::after {
  margin-inline: 9px;
  color: var(--rule-strong);
  content: '·';
}

.research-desk {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.research-desk__layout,
.method-grid,
.tool-index__heading {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(40px, 8vw, 120px);
}

.research-desk__layout > div:first-child p,
.tool-index__heading > p,
.method-grid > div:first-child > p {
  max-width: 560px;
  margin-top: 20px;
  color: var(--quiet);
}

.research-desk__links a {
  display: grid;
  grid-template-columns: minmax(150px, 0.6fr) 1fr auto;
  padding: 19px 0;
  gap: 18px;
  align-items: center;
  border-top: 1px solid var(--rule);
  text-decoration: none;
}

.research-desk__links a:last-child {
  border-bottom: 1px solid var(--rule);
}

.research-desk__links span {
  color: var(--quiet);
  font-size: 0.75rem;
}

.research-desk__links strong {
  font-size: 1.05rem;
}

.research-desk__links a:hover b {
  color: var(--blue);
}

.unlock-section,
.research-newsletter {
  background: var(--panel);
}

.unlock-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: clamp(40px, 8vw, 120px);
  align-items: end;
}

.unlock-layout p {
  max-width: 520px;
  margin-bottom: 24px;
  color: var(--quiet);
}

.articles-section {
  background: var(--paper);
}

.article-grid {
  display: block;
  border-top: 1px solid var(--ink);
}

.article-card {
  display: grid;
  grid-template-columns: minmax(120px, 0.22fr) minmax(0, 1fr) 110px;
  gap: clamp(22px, 4vw, 58px);
  padding: 28px 0;
  align-items: start;
  border-bottom: 1px solid var(--rule);
}

.article-card__meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--quiet);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.article-card__body h3 {
  font-size: clamp(1.65rem, 2.6vw, 2.5rem);
}

.article-card__body h3 a {
  text-decoration: none;
}

.article-card__body p {
  max-width: 760px;
  margin-top: 13px;
  color: var(--quiet);
}

.article-card__link {
  justify-self: end;
  white-space: nowrap;
}

.section-action {
  width: min(calc(100% - (var(--pad) * 2)), var(--max));
  margin: 30px auto 0;
}

.peptide-callout {
  border-top: 1px solid var(--ink);
}

.peptide-callout__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: end;
}

.peptide-callout__actions,
.profile-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto minmax(260px, 0.7fr);
  padding: 48px var(--pad);
  gap: 48px;
  align-items: start;
  border-top: 1px solid var(--ink);
}

.site-footer__brand strong {
  display: block;
  max-width: 320px;
  font-size: 1.25rem;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 700;
}

.site-footer__note {
  display: grid;
  gap: 10px;
  color: var(--quiet);
  font-size: 0.78rem;
}

.page-hero,
.peptide-hero,
.tool-hero,
.profile-hero {
  border-bottom: 1px solid var(--rule);
}

.page-hero,
.tool-hero {
  padding-block: clamp(64px, 8vw, 112px);
}

.page-hero--blue,
.profile-hero {
  background: var(--paper);
}

.page-hero__grid,
.tool-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  gap: clamp(48px, 9vw, 140px);
  align-items: end;
}

.page-hero__grid > p {
  max-width: 620px;
  color: var(--quiet);
  font-size: 1.12rem;
}

.peptide-hero {
  padding-block: clamp(68px, 9vw, 128px);
}

.peptide-hero__content {
  margin-inline: var(--pad) auto;
  text-align: left;
}

.peptide-hero__content h1 {
  max-width: 920px;
}

.trust-line {
  margin-top: 28px;
}

.directory-section {
  background: var(--paper);
}

.directory-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: clamp(40px, 8vw, 110px);
  align-items: end;
  margin-bottom: 36px;
}

.directory-heading p {
  max-width: 580px;
  color: var(--quiet);
}

.directory-layout {
  display: grid;
  grid-template-columns: minmax(230px, 300px) minmax(0, 1fr);
  background: var(--powder);
  border: 1px solid var(--rule-strong);
}

.goal-panel {
  border-right: 1px solid var(--rule-strong);
}

.goal-panel__header,
.directory-results__header {
  display: flex;
  min-height: 76px;
  padding: 18px 20px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--rule-strong);
}

.goal-panel__header {
  color: var(--quiet);
  font-size: 0.76rem;
}

.goal-panel__header span:first-child {
  color: var(--ink);
  font-size: 0.93rem;
  font-weight: 700;
}

.goal-list__item {
  display: grid;
  grid-template-columns: 1fr auto;
  width: 100%;
  min-height: 54px;
  padding: 11px 18px;
  gap: 12px;
  align-items: center;
  background: transparent;
  color: var(--ink);
  border: 0;
  border-bottom: 1px solid var(--rule-soft);
  text-align: left;
}

.goal-list__item span:first-child {
  font-size: 0.87rem;
  font-weight: 700;
  line-height: 1.23;
}

.goal-list__item span:last-child {
  color: var(--quiet);
  font-size: 0.68rem;
  white-space: nowrap;
}

.goal-list__item[aria-pressed='true'] {
  box-shadow: inset 3px 0 var(--blue);
}

.directory-results {
  min-width: 0;
}

.directory-results__header h3 {
  font-size: clamp(1.8rem, 3.2vw, 3rem);
}

.directory-results__header > span {
  color: var(--quiet);
  font-size: 0.76rem;
  white-space: nowrap;
}

.directory-facets {
  display: grid;
  grid-template-columns: minmax(170px, 240px) minmax(190px, 260px) auto;
  gap: 16px;
  padding: 16px 20px;
  align-items: end;
  border-bottom: 1px solid var(--rule-strong);
}

.directory-facets label,
.compatibility-form label,
.calculator-field label,
.gate-form label,
.sourcing-dialog label {
  display: flex;
  flex-direction: column;
  gap: 7px;
  color: var(--quiet);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

input,
select,
textarea {
  min-width: 0;
  min-height: 46px;
  padding: 0 13px;
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--rule-strong);
  border-radius: 0;
  text-transform: none;
}

.compound-grid {
  display: block;
}

.compound-card {
  display: grid;
  grid-template-columns: minmax(210px, 0.65fr) minmax(260px, 1fr) minmax(260px, 0.9fr);
  gap: clamp(20px, 3vw, 42px);
  padding: 26px 20px;
  border-bottom: 1px solid var(--rule-strong);
}

.compound-card:last-child {
  border-bottom: 0;
}

.compound-card__identity {
  min-width: 0;
}

.compound-card__kind,
.compound-card__fit {
  color: var(--quiet);
  font-size: 0.68rem;
  font-weight: 700;
}

.compound-card__identity h3 {
  margin-top: 7px;
  font-size: clamp(1.65rem, 2.4vw, 2.35rem);
}

.compound-card__identity h3 a {
  text-decoration: none;
}

.compound-card__fit {
  display: block;
  margin-top: 7px;
}

.compound-card__description {
  color: var(--body);
  font-size: 0.92rem;
}

.compound-card__summary .tag-list {
  margin-top: 14px;
}

.compound-card__facts {
  border-top: 1px solid var(--rule-strong);
}

.compound-card__facts div {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--rule-strong);
}

.compound-card__facts dd {
  color: var(--body);
  font-size: 0.77rem;
  line-height: 1.3;
}

.compound-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 15px;
}

.compound-card__actions .text-link,
.compound-card__actions .text-button {
  font-size: 0.72rem;
}

.research-map {
  margin-bottom: 18px;
}

.research-map__label {
  margin-bottom: 5px;
  color: var(--quiet);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.research-map__axis {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-bottom: 12px;
  border-top: 1px solid var(--rule-strong);
}

.research-map__axis span {
  display: flex;
  min-width: 0;
  padding-top: 6px;
  gap: 5px;
  align-items: center;
  color: var(--quiet);
  font-size: 0.6rem;
  line-height: 1.1;
}

.research-map__axis i {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--paper);
  border: 1px solid var(--ink);
}

.research-map__axis--route span[data-active='true'] i {
  background: var(--ink);
}

.research-map__category {
  display: flex;
  min-height: 26px;
  margin-bottom: 12px;
  padding: 6px 0;
  gap: 7px;
  align-items: center;
  color: var(--quiet);
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  font-size: 0.66rem;
  line-height: 1.2;
}

.research-map__category i {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--ink);
}

.research-map figcaption {
  display: none;
}

.research-map--compact {
  width: min(100%, 220px);
  margin-bottom: 13px;
}

.empty-state {
  padding: 36px 20px;
  color: var(--quiet);
}

.compare-tray {
  position: fixed;
  right: var(--pad);
  bottom: 22px;
  left: var(--pad);
  z-index: var(--z-tray);
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  max-width: 980px;
  min-height: 68px;
  margin-inline: auto;
  padding: 12px 16px;
  gap: 18px;
  align-items: center;
  background: var(--paper);
  border: 1px solid var(--ink);
}

.compare-tray .eyebrow {
  margin-bottom: 2px;
}

.compare-tray__names {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 14px;
  color: var(--quiet);
  font-size: 0.78rem;
}

.tool-index {
  border-top: 1px solid var(--rule);
}

.tool-index__heading {
  margin-bottom: 42px;
  align-items: end;
}

.tool-index__list {
  border-top: 1px solid var(--ink);
}

.tool-index__list > a {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) auto;
  padding: 22px 0;
  gap: 24px;
  align-items: center;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
}

.tool-index__list > a > span {
  color: var(--quiet);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
}

.tool-index__list strong {
  font-size: 1.1rem;
}

.tool-index__list p {
  margin-top: 4px;
  color: var(--quiet);
  font-size: 0.86rem;
}

.tool-index__list a:hover b {
  color: var(--blue);
}

.stack-preview,
.stack-library {
  background: var(--paper);
}

.stack-preview__layout,
.stack-library__layout {
  display: grid;
  grid-template-columns: minmax(250px, 0.55fr) minmax(0, 1.45fr);
  gap: clamp(48px, 8vw, 120px);
  align-items: start;
}

.stack-preview__intro,
.stack-library__aside {
  position: sticky;
  top: 102px;
}

.stack-preview__intro p,
.stack-library__aside p {
  margin: 20px 0 26px;
  color: var(--quiet);
}

.stack-list {
  border-top: 1px solid var(--ink);
}

.stack-card {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 18px;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
}

.stack-card__number {
  color: var(--quiet);
  font-size: 0.72rem;
  font-weight: 700;
}

.stack-card__purpose {
  color: var(--quiet);
  font-size: 0.73rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.stack-card h2 {
  margin-top: 8px;
  font-size: clamp(2rem, 3.8vw, 3.25rem);
}

.stack-card__matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 22px;
  border-top: 1px solid var(--rule);
}

.stack-card__matrix > div {
  padding: 15px 15px 0 0;
  border-right: 1px solid var(--rule);
}

.stack-card__matrix > div + div {
  padding-left: 15px;
}

.stack-card__matrix > div:last-child {
  border-right: 0;
}

.stack-card__matrix span {
  color: var(--quiet);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.stack-card__matrix p {
  margin-top: 8px;
  color: var(--body);
  font-size: 0.82rem;
}

.stack-card__boundary {
  margin-top: 16px;
  padding-top: 12px;
  color: var(--quiet);
  border-top: 1px solid var(--rule);
  font-size: 0.74rem;
}

.calculator-page {
  background: var(--powder);
}

.calculator-heading {
  margin-bottom: 42px;
  margin-inline: var(--pad) auto;
  text-align: left;
}

.calculator-heading h1 {
  text-transform: none;
}

.calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  gap: 0;
  background: var(--paper);
  border: 1px solid var(--ink);
}

.calculator-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px 18px;
  padding: clamp(26px, 4vw, 50px);
  border-right: 1px solid var(--ink);
}

.calculator-field {
  min-width: 0;
}

.input-with-unit,
.input-split,
.compound-input {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  min-width: 0;
}

.input-with-unit > span {
  display: grid;
  min-width: 60px;
  min-height: 46px;
  padding-inline: 10px;
  place-items: center;
  background: var(--panel);
  color: var(--quiet);
  border: 1px solid var(--rule-strong);
  border-left: 0;
  font-size: 0.77rem;
}

.input-split select,
.compound-input select {
  border-left: 0;
}

.calculator-result {
  padding: clamp(26px, 4vw, 50px);
}

.calculator-result__amount {
  display: block;
  margin-top: 24px;
  font-size: clamp(3.8rem, 6.6vw, 6.6rem);
  letter-spacing: -0.04em;
  line-height: 0.9;
}

.calculator-result > p {
  margin-top: 18px;
}

.calculator-result__concentration {
  color: var(--quiet);
  font-size: 0.85rem;
}

.syringe-readout {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

.syringe-readout__labels,
.syringe-scale {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.72rem;
}

.syringe-track {
  position: relative;
  height: 42px;
  margin-top: 13px;
  overflow: hidden;
  background: repeating-linear-gradient(90deg, transparent 0, transparent calc(5% - 1px), var(--rule-strong) calc(5% - 1px), var(--rule-strong) 5%);
  border: 1px solid var(--ink);
}

.syringe-track span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--blue);
  transform-origin: left;
}

.syringe-scale {
  margin-top: 6px;
  color: var(--quiet);
}

.calculator-error {
  padding: 12px;
  border: 1px solid var(--ink);
  font-weight: 700;
}

.calculator-notes {
  margin-top: 0;
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-top: 0;
}

.calculator-notes > p {
  color: var(--quiet);
  font-size: 0.86rem;
}

.accordion {
  margin-block: 18px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.accordion > button {
  display: flex;
  width: 100%;
  min-height: 48px;
  padding: 0;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  border: 0;
  font-weight: 700;
}

.accordion__panel {
  padding: 0 0 20px;
  color: var(--quiet);
}

.accordion__panel p + p {
  margin-top: 10px;
}

.calculator-warning {
  font-size: 0.82rem;
}

.calculator-boundary {
  margin-top: 14px;
  color: var(--quiet);
  font-size: 0.78rem;
}

.scope-line {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 700;
}

.compatibility-section {
  background: var(--powder);
}

.demo-notice {
  display: grid;
  grid-template-columns: auto 1fr;
  padding: 15px 18px;
  gap: 14px;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-bottom: 0;
  font-size: 0.8rem;
}

.demo-notice span {
  color: var(--quiet);
}

.compatibility-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  background: var(--paper);
  border: 1px solid var(--ink);
}

.compatibility-form {
  padding: clamp(25px, 4vw, 48px);
  border-right: 1px solid var(--ink);
}

.compatibility-form__heading p {
  max-width: 600px;
  margin-top: 14px;
  color: var(--quiet);
}

.compatibility-form fieldset {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 16px;
  margin: 32px 0 0;
  padding: 24px 0 0;
  border: 0;
  border-top: 1px solid var(--rule);
}

.compatibility-form legend {
  padding: 0 14px 0 0;
  color: var(--quiet);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.compatibility-form__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 20px;
  align-items: center;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}

.compatibility-errors {
  margin-top: 22px;
  padding: 14px;
  border: 1px solid var(--ink);
  font-size: 0.85rem;
  font-weight: 700;
}

.compatibility-errors ul {
  margin: 10px 0 0;
  padding-left: 18px;
  font-weight: 400;
}

.field-invalid input,
.field-invalid select {
  border-color: var(--ink);
  box-shadow: inset 3px 0 var(--ink);
}

.compatibility-result {
  min-width: 0;
  padding: clamp(25px, 4vw, 48px);
}

.compatibility-result__head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: start;
}

.state-code {
  color: var(--quiet);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-align: right;
}

.compatibility-result h2 {
  margin-top: 24px;
  font-size: clamp(2.2rem, 4vw, 3.45rem);
}

.compatibility-result > p {
  margin-top: 18px;
  color: var(--quiet);
}

.result-pair {
  margin-top: 26px;
  padding: 14px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  font-size: 0.82rem;
  font-weight: 700;
}

.result-ledger,
.result-evidence,
.result-sources,
.result-endpoints,
.result-failures,
.not-assessed {
  margin-top: 28px;
}

.result-ledger h3,
.result-evidence h3,
.result-sources h3,
.result-endpoints h3,
.result-failures h3,
.not-assessed h3 {
  font-size: 0.8rem;
  letter-spacing: 0;
  line-height: 1.2;
}

.result-ledger dl {
  margin-top: 12px;
  border-top: 1px solid var(--rule);
}

.result-ledger dl > div {
  display: grid;
  grid-template-columns: 1fr auto;
  padding: 8px 0;
  gap: 15px;
  border-bottom: 1px solid var(--rule);
  font-size: 0.76rem;
}

.result-ledger dd {
  font-weight: 700;
}

.result-evidence ul,
.result-endpoints ul,
.result-failures ul {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--quiet);
  font-size: 0.78rem;
}

.result-evidence > div {
  margin-top: 10px;
  border-top: 1px solid var(--rule);
}

.result-evidence details {
  padding: 9px 0;
  border-bottom: 1px solid var(--rule);
}

.result-evidence summary {
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 700;
}

.result-evidence li + li {
  margin-top: 8px;
}

.result-evidence li p {
  margin-top: 2px;
  color: var(--quiet);
}

.result-sources > div {
  margin-top: 10px;
  border-top: 1px solid var(--rule);
}

.result-sources article {
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.78rem;
}

.result-sources article p,
.result-sources article ul {
  margin: 5px 0 0;
  color: var(--quiet);
}

.result-sources article ul {
  padding-left: 18px;
}

.not-assessed {
  padding-top: 17px;
  border-top: 1px solid var(--rule);
}

.not-assessed p {
  margin-top: 8px;
  color: var(--quiet);
  font-size: 0.74rem;
}

.result-version {
  margin-top: 28px;
  padding-top: 12px;
  color: var(--quiet);
  border-top: 1px solid var(--rule);
  font-size: 0.66rem;
}

.method-section {
  border-bottom: 1px solid var(--rule);
}

.method-ledger {
  border-top: 1px solid var(--ink);
}

.method-ledger > div {
  display: grid;
  grid-template-columns: minmax(130px, 0.4fr) 1fr;
  padding: 15px 0;
  gap: 20px;
  border-bottom: 1px solid var(--rule);
}

.method-ledger span {
  font-size: 0.78rem;
  font-weight: 700;
}

.method-ledger p {
  color: var(--quiet);
  font-size: 0.82rem;
}

.source-notes {
  margin-top: 54px;
  padding-top: 26px;
  border-top: 1px solid var(--ink);
}

.source-notes ul {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 0;
  padding: 0;
  gap: 28px;
  list-style: none;
}

.source-notes a {
  font-weight: 700;
}

.source-notes p {
  margin-top: 8px;
  color: var(--quiet);
  font-size: 0.8rem;
}

.practical-map {
  border-bottom: 1px solid var(--rule);
}

.practical-map__heading {
  max-width: 920px;
  margin-bottom: 48px;
}

.practical-map__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--ink);
}

.practical-map article {
  min-width: 0;
  padding: 24px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--ink);
}

.practical-map article:last-child {
  border-right: 0;
}

.practical-map__number {
  color: var(--quiet);
  font-size: 0.7rem;
}

.practical-map svg {
  width: 100%;
  height: 112px;
  margin: 20px 0 28px;
  fill: none;
  stroke: var(--ink);
  stroke-width: 1;
}

.practical-map h3 {
  font-size: 1.7rem;
}

.practical-map article > p {
  min-height: 132px;
  margin-top: 14px;
  color: var(--quiet);
  font-size: 0.84rem;
}

.practical-map dl {
  margin-top: 20px;
  border-top: 1px solid var(--rule);
}

.practical-map dl div {
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
}

.practical-map dt {
  color: var(--quiet);
  font-size: 0.64rem;
  font-weight: 700;
  text-transform: uppercase;
}

.practical-map dd {
  margin-top: 3px;
  font-size: 0.75rem;
}

.completeness-section {
  background: var(--powder);
}

.completeness-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.2fr);
  background: var(--paper);
  border: 1px solid var(--ink);
}

.completeness-intro,
.completeness-checks {
  padding: clamp(26px, 4vw, 50px);
}

.completeness-intro {
  border-right: 1px solid var(--ink);
}

.completeness-intro > p {
  margin-top: 18px;
  color: var(--quiet);
}

.completeness-result {
  margin-top: 38px;
  padding-top: 20px;
  border-top: 1px solid var(--ink);
}

.completeness-result > strong {
  font-size: 1.15rem;
}

.completeness-result > p {
  min-height: 48px;
  margin-top: 8px;
  color: var(--quiet);
  font-size: 0.82rem;
}

.completeness-track {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
  margin-top: 18px;
}

.completeness-track span {
  height: 8px;
  background: var(--panel);
  border: 1px solid var(--rule-strong);
}

.completeness-track span[data-complete='true'] {
  background: var(--ink);
  border-color: var(--ink);
}

.completeness-checks {
  display: flex;
  flex-direction: column;
}

.completeness-checks label {
  display: grid;
  grid-template-columns: 20px 38px 1fr;
  min-height: 52px;
  gap: 10px;
  align-items: center;
  border-bottom: 1px solid var(--rule);
  font-size: 0.86rem;
}

.completeness-checks input {
  min-height: 18px;
  height: 18px;
  width: 18px;
  padding: 0;
  accent-color: var(--ink);
}

.completeness-checks label span {
  color: var(--quiet);
  font-size: 0.68rem;
}

.completeness-checks .text-button {
  align-self: flex-start;
  margin-top: 22px;
}

.research-toolbar {
  display: flex;
  padding-bottom: 18px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: var(--quiet);
  border-bottom: 1px solid var(--rule);
  font-size: 0.78rem;
}

.research-toolbar__topics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.article-grid--archive {
  margin-top: 30px;
}

.research-newsletter .section-heading {
  margin-bottom: 0;
}

.research-newsletter .button {
  margin-top: 24px;
}

.profile-hero {
  padding-block: clamp(60px, 7vw, 100px);
}

.profile-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
  gap: clamp(48px, 8vw, 120px);
  align-items: start;
}

.profile-hero h1 {
  font-size: clamp(3.6rem, 7vw, 6rem);
}

.profile-hero__inner > div:first-child > p {
  max-width: 720px;
  margin-top: 20px;
  color: var(--quiet);
  font-size: 1.1rem;
}

.profile-hero__actions {
  margin-top: 28px;
}

.profile-hero__aside .research-map {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--ink);
}

.profile-glance {
  border-top: 1px solid var(--ink);
}

.profile-tabs {
  position: sticky;
  top: 68px;
  z-index: var(--z-subnav);
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.profile-tabs > div {
  display: flex;
  overflow-x: auto;
}

.profile-tabs button {
  min-height: 50px;
  padding: 0 18px;
  background: transparent;
  color: var(--quiet);
  border: 0;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  font-size: 0.78rem;
  font-weight: 700;
}

.profile-tabs button[aria-selected='true'] {
  color: var(--ink);
  border-bottom-color: var(--blue);
}

.profile-panel {
  padding-block: var(--section);
}

.profile-intro {
  max-width: 940px;
}

.profile-intro > p {
  max-width: 760px;
  margin-top: 20px;
  color: var(--quiet);
  font-size: 1.05rem;
}

.profile-intro blockquote {
  margin-top: 28px;
  padding: 18px 0 18px 22px;
  border-left: 2px solid var(--ink);
  font-size: 1.1rem;
  font-weight: 700;
}

.profile-snapshot-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 48px;
  border-top: 1px solid var(--ink);
}

.profile-snapshot-grid > div {
  padding-right: 22px;
}

.profile-snapshot-grid strong {
  display: block;
  margin-top: 5px;
  font-size: 0.88rem;
}

.profile-evidence-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: clamp(48px, 8vw, 120px);
}

.research-timeline {
  margin: 34px 0 0;
  padding: 0;
  border-top: 1px solid var(--ink);
  list-style: none;
}

.research-timeline li {
  display: grid;
  grid-template-columns: 48px 1fr;
  padding: 20px 0;
  gap: 18px;
  border-bottom: 1px solid var(--rule);
}

.research-timeline li > span {
  color: var(--quiet);
  font-size: 0.68rem;
}

.research-timeline p {
  margin-top: 5px;
  color: var(--quiet);
}

.source-ledger {
  padding-top: 22px;
  border-top: 1px solid var(--ink);
}

.source-ledger p {
  margin: 18px 0 24px;
  color: var(--quiet);
}

.profile-stack-links {
  display: flex;
  flex-direction: column;
  max-width: 760px;
  margin: 32px 0 26px;
  border-top: 1px solid var(--ink);
}

.profile-stack-links a,
.profile-stack-links p {
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
  font-weight: 700;
  text-decoration: none;
}

.modal {
  width: min(calc(100% - 32px), 720px);
  max-height: min(88vh, 850px);
  padding: clamp(28px, 5vw, 56px);
  overflow: auto;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 0;
}

.modal::backdrop {
  background: var(--scrim);
}

.modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 0;
  font-size: 1.3rem;
}

.modal h2 {
  max-width: 590px;
}

.modal > p {
  margin-top: 18px;
  color: var(--quiet);
}

.ai-gate blockquote {
  margin: 24px 0;
  padding: 16px;
  background: var(--panel);
  border-left: 2px solid var(--ink);
}

.gate-form__row {
  display: grid;
  grid-template-columns: 1fr auto;
}

.gate-form__row .button {
  min-height: 46px;
}

.form-note {
  margin-top: 10px;
  color: var(--quiet);
  font-size: 0.72rem;
}

.ai-unlocked {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--ink);
}

.ai-unlocked p {
  margin-bottom: 20px;
  color: var(--quiet);
}

.sourcing-dialog form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: end;
  margin-top: 26px;
}

.sourcing-result {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

.sourcing-result p {
  margin-top: 5px;
  color: var(--quiet);
}

.compare-dialog {
  width: min(calc(100% - 32px), 1040px);
}

.compare-table-wrap {
  margin-top: 30px;
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.compare-table th,
.compare-table td {
  padding: 12px;
  border: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}

@media (max-width: 1180px) {
  .site-nav {
    gap: 13px;
  }

  .site-nav__link {
    font-size: 0.78rem;
  }

  .ranking-feature {
    grid-template-columns: 54px 1fr;
  }

  .ranking-feature__facts {
    grid-column: 2;
  }

  .compound-card {
    grid-template-columns: minmax(180px, 0.55fr) minmax(0, 1fr);
  }

  .compound-card__evidence {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .practical-map__grid {
    grid-template-columns: 1fr 1fr;
  }

  .practical-map article:nth-child(2) {
    border-right: 0;
  }

  .practical-map article > p {
    min-height: 96px;
  }
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: auto auto 1fr auto;
  }

  .nav-toggle {
    display: inline-flex;
    grid-column: 4;
    align-items: center;
    justify-content: center;
  }

  .header-ai {
    grid-column: 3;
    grid-row: 1;
    justify-self: end;
    margin-right: 10px;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    padding: 12px var(--pad) 20px;
    flex-direction: column;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--ink);
  }

  .site-nav[data-open='true'] {
    display: flex;
  }

  .site-nav__link {
    padding: 12px 0;
    border-bottom: 1px solid var(--rule);
  }

  .intent-bar {
    grid-template-columns: repeat(3, 1fr);
  }

  .intent-bar a:nth-child(3) {
    border-right: 0;
  }

  .intent-bar a:nth-child(-n + 3) {
    border-bottom: 1px solid var(--rule);
  }

  .ranking-layout,
  .directory-layout,
  .stack-preview__layout,
  .stack-library__layout,
  .calculator-layout,
  .compatibility-workspace,
  .completeness-layout,
  .profile-hero__inner {
    grid-template-columns: 1fr;
  }

  .ranking-feature,
  .goal-panel,
  .calculator-form,
  .compatibility-form,
  .completeness-intro {
    border-right: 0;
    border-bottom: 1px solid var(--ink);
  }

  .ranking-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .ranking-list__item:nth-child(odd) {
    border-right: 1px solid var(--rule);
  }

  .goal-panel {
    max-height: 360px;
    overflow: auto;
  }

  .stack-preview__intro,
  .stack-library__aside {
    position: static;
  }

  .calculator-form {
    border-bottom-color: var(--ink);
  }

  .profile-hero__aside {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 760px) {
  :root {
    --pad: 20px;
    --section: 56px;
  }

  h1 {
    font-size: clamp(2.8rem, 13vw, 3.6rem);
  }

  h2 {
    font-size: clamp(2.15rem, 10vw, 3rem);
  }

  .site-header {
    min-height: 62px;
  }

  .wordmark > span:last-child {
    display: none;
  }

  .header-ai {
    font-size: 0.7rem;
  }

  .home-hero {
    min-height: auto;
  }

  .home-hero__art {
    top: -2%;
    right: -48%;
    width: 130vw;
    opacity: 0.055;
  }

  .home-hero__content {
    padding-block: 80px;
  }

  .home-hero h1 {
    font-size: clamp(3rem, 14vw, 4rem);
  }

  .ai-composer {
    grid-template-columns: 1fr;
  }

  .ai-composer button {
    min-height: 48px;
    border-top: 1px solid var(--ink);
    border-left: 0;
  }

  .ai-composer__meta,
  .trust-line {
    display: grid;
    gap: 6px;
  }

  .ai-composer__meta span::after,
  .trust-line span::after {
    content: none !important;
  }

  .intent-bar {
    grid-template-columns: 1fr;
  }

  .intent-bar a,
  .intent-bar a:nth-child(n) {
    min-height: 54px;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .ranking-layout,
  .research-desk__layout,
  .unlock-layout,
  .page-hero__grid,
  .tool-hero__grid,
  .directory-heading,
  .tool-index__heading,
  .method-grid,
  .profile-evidence-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .ranking-feature {
    grid-template-columns: 38px 1fr;
    gap: 14px;
    padding-right: 0;
  }

  .ranking-feature__facts,
  .ranking-feature > .button {
    grid-column: 1 / -1;
  }

  .ranking-list {
    grid-template-columns: 1fr;
  }

  .ranking-list__item:nth-child(n) {
    border-right: 0;
  }

  .research-desk__links a,
  .article-card {
    grid-template-columns: 1fr auto;
  }

  .research-desk__links a span,
  .article-card__meta {
    grid-column: 1 / -1;
  }

  .article-card__body {
    grid-column: 1;
  }

  .peptide-callout__inner {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .site-footer {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .directory-facets {
    grid-template-columns: 1fr;
  }

  .compound-card {
    grid-template-columns: 1fr;
  }

  .compound-card__evidence {
    grid-column: auto;
    grid-template-columns: 1fr;
  }

  .research-map--compact {
    max-width: 260px;
  }

  .compare-tray {
    right: 12px;
    bottom: 12px;
    left: 12px;
    grid-template-columns: 1fr auto;
  }

  .compare-tray__names {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .tool-index__list > a {
    grid-template-columns: 50px 1fr auto;
    gap: 14px;
  }

  .stack-card {
    grid-template-columns: 36px 1fr;
  }

  .stack-card__matrix {
    grid-template-columns: 1fr;
  }

  .stack-card__matrix > div,
  .stack-card__matrix > div + div {
    padding: 13px 0;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .calculator-form,
  .compatibility-form fieldset {
    grid-template-columns: 1fr;
  }

  .calculator-layout,
  .calculator-notes {
    width: calc(100% - (var(--pad) * 2));
  }

  .compatibility-workspace,
  .demo-notice {
    width: 100%;
  }

  .demo-notice {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .source-notes ul,
  .practical-map__grid,
  .profile-snapshot-grid,
  .profile-hero__aside {
    grid-template-columns: 1fr;
  }

  .practical-map article:nth-child(n) {
    border-right: 0;
  }

  .practical-map article > p {
    min-height: auto;
  }

  .profile-tabs {
    top: 62px;
  }

  .gate-form__row,
  .sourcing-dialog form {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .home-hero h1,
  h1 {
    font-size: 2.75rem;
  }

  h2 {
    font-size: 2.2rem;
  }

  .header-ai {
    display: none;
  }

  .site-header {
    grid-template-columns: auto 1fr auto;
  }

  .nav-toggle {
    grid-column: 3;
  }

  .ranking-feature__main h3,
  .calculator-result__amount {
    font-size: 3rem;
  }

  .compound-input,
  .input-split {
    grid-template-columns: 1fr;
  }

  .compound-input select,
  .input-split select {
    border-top: 0;
    border-left: 1px solid var(--rule-strong);
  }

  .compatibility-form__actions,
  .profile-hero__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .compatibility-form__actions .button,
  .profile-hero__actions .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

@media print {
  .site-header,
  .site-footer,
  .compare-tray,
  .profile-tabs,
  .header-ai,
  .nav-toggle {
    display: none !important;
  }

  .section-pad,
  .profile-panel {
    padding-block: 28px;
  }

  a {
    text-decoration: none;
  }
}