/*
 * BasedBioHacker, prototype two
 *
 * A restrained override layer for the existing site. The visual language is
 * intentionally editorial and clinical: white space carries the hierarchy,
 * powder blue is reserved for interactive context, and cobalt is used only
 * for state, focus, and orientation.
 */

:root {
  --paper: #ffffff;
  --ink: #101214;
  --body: #30343a;
  --quiet: #656b73;
  --muted: #747a82;
  --rule: #e1e4e8;
  --rule-soft: #eceef1;
  --rule-strong: #c8cdd3;
  --panel: #f7f8f9;
  --powder: #eef3ff;
  --blue: #1f55d5;
  --scrim: rgba(16, 18, 20, 0.7);
  --max: 1180px;
  --narrow: 720px;
  --measure: 42rem;
  --pad: clamp(20px, 4vw, 56px);
  --section: clamp(72px, 9vw, 112px);
  --header-height: 64px;
  --motion-fast: 140ms;
  --motion-state: 220ms;
  --ease-out: cubic-bezier(0.2, 0.75, 0.25, 1);
  font-family: Helvetica, Arial, sans-serif;
}

html {
  background: var(--paper);
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.56;
  -webkit-font-smoothing: antialiased;
}

main {
  overflow: clip;
}

h1,
h2,
h3 {
  max-width: 18ch;
  letter-spacing: -0.032em;
  line-height: 1.02;
}

h1 {
  font-size: clamp(2.9rem, 6vw, 4.35rem);
}

h2 {
  font-size: clamp(2rem, 3.8vw, 2.75rem);
}

h3 {
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
  line-height: 1.12;
}

p,
li,
dd {
  color: var(--body);
}

a {
  text-underline-offset: 0.22em;
}

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

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

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

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

.eyebrow {
  margin-bottom: 12px;
  color: var(--blue);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  line-height: 1.35;
  text-transform: uppercase;
}

.section-heading {
  margin-bottom: clamp(32px, 5vw, 52px);
}

.section-heading p,
.tool-hero__copy,
.peptide-hero__content > p,
.calculator-heading > p {
  max-width: var(--measure);
  margin-top: 18px;
  color: var(--quiet);
  font-size: clamp(1rem, 1.3vw, 1.12rem);
}

/* Header */

.site-header {
  grid-template-columns: auto minmax(0, 1fr) auto;
  min-height: var(--header-height);
  padding-inline: var(--pad);
  background: rgba(255, 255, 255, 0.97);
  border-bottom-color: var(--rule);
}

.wordmark {
  gap: 0;
  font-size: 0.94rem;
  letter-spacing: -0.02em;
}

.site-nav {
  gap: clamp(22px, 3vw, 42px);
}

.site-nav__link {
  padding-block: 21px;
  color: var(--quiet);
  font-size: 0.8rem;
  letter-spacing: 0.01em;
}

.site-nav__link::after {
  height: 1px;
  background: var(--blue);
  transition: transform var(--motion-fast) var(--ease-out);
}

.site-nav__link:hover {
  color: var(--quiet);
}

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

.header-ai,
.nav-toggle {
  min-height: 40px;
  padding-inline: 14px;
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
  border-radius: 2px;
  font-size: 0.76rem;
}

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

/* Controls */

.button {
  min-height: 44px;
  padding-inline: 17px;
  border-radius: 2px;
  font-size: 0.82rem;
  transition:
    background-color var(--motion-fast) linear,
    border-color var(--motion-fast) linear,
    color var(--motion-fast) linear,
    transform 80ms linear;
}

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

.button--outline,
.button--soft {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--rule-strong);
}

.button:hover {
  background: inherit;
  color: inherit;
}

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

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

.button:active,
.header-ai:active,
.nav-toggle:active {
  transform: scale(0.985);
}

.text-link,
.text-button,
.article-card__link {
  color: var(--ink);
  font-size: 0.8rem;
  text-decoration-thickness: 1px;
}

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

input,
select,
textarea {
  min-height: 46px;
  padding-inline: 13px;
  background: var(--paper);
  color: var(--ink);
  border-color: var(--rule-strong);
  border-radius: 2px;
  transition: border-color var(--motion-fast) linear;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--blue);
}

/* Home */

.home-hero {
  min-height: min(760px, calc(100svh - var(--header-height)));
  border-bottom-color: var(--rule);
}

.home-hero__art {
  top: -10%;
  right: -6%;
  width: min(67vw, 900px);
  height: 120%;
  opacity: 0.065;
  filter: grayscale(1) contrast(0.72);
}

.home-hero__content {
  max-width: var(--max);
  padding-block: clamp(80px, 11vw, 138px);
}

.home-hero h1 {
  max-width: 14ch;
  font-size: clamp(3.25rem, 6.5vw, 5.4rem);
  letter-spacing: -0.045em;
}

.home-hero__content > p {
  max-width: 34rem;
  margin-top: 22px;
  color: var(--quiet);
  font-size: clamp(1rem, 1.3vw, 1.14rem);
}

.home-hero__content > .button {
  margin-top: 28px;
}

.ai-composer {
  width: min(100%, 660px);
  margin-top: 18px;
  border-color: var(--rule-strong);
  border-radius: 2px;
}

.ai-composer input {
  height: 54px;
  background: var(--paper);
}

.ai-composer button {
  padding-inline: 20px;
  background: var(--ink);
  color: var(--paper);
  border-left-color: var(--ink);
  font-size: 0.82rem;
}

.ai-composer:focus-within {
  outline-color: var(--blue);
}

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

.start-section__heading {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 1.1fr);
  gap: clamp(36px, 8vw, 108px);
  align-items: end;
  margin-bottom: 42px;
}

.start-section__heading p {
  max-width: 33rem;
  color: var(--quiet);
}

.start-paths {
  border-top: 1px solid var(--ink);
}

.start-paths > a {
  display: grid;
  grid-template-columns: minmax(180px, 0.5fr) minmax(0, 1fr) auto;
  min-height: 72px;
  padding: 18px 0;
  gap: 24px;
  align-items: center;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
}

.start-paths > a::after {
  color: var(--blue);
  content: '→';
  font-weight: 700;
}

.start-paths strong {
  font-size: 1rem;
}

.start-paths span {
  color: var(--quiet);
  font-size: 0.9rem;
}

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

.ranking-layout {
  grid-template-columns: minmax(0, 1fr) minmax(250px, 330px);
  border-top-color: var(--ink);
  border-bottom-color: var(--ink);
}

.ranking-feature {
  grid-template-columns: 48px minmax(0, 1fr) minmax(170px, 210px);
  gap: 24px;
  padding: clamp(30px, 4vw, 48px) clamp(24px, 4vw, 48px) clamp(30px, 4vw, 48px) 0;
}

.ranking-feature__meta {
  margin-bottom: 12px;
  color: var(--quiet);
  font-size: 0.67rem;
  letter-spacing: 0.08em;
}

.ranking-feature__main h3 {
  font-size: clamp(2rem, 3.8vw, 3rem);
}

.ranking-feature__main > p {
  max-width: 34rem;
  margin-top: 14px;
  color: var(--quiet);
  font-size: 0.96rem;
}

.ranking-feature__facts div,
.profile-glance div,
.profile-snapshot-grid > div {
  padding-block: 10px;
}

.ranking-list__item {
  min-height: 62px;
  padding-inline: 18px;
  transition:
    background-color var(--motion-fast) linear,
    color var(--motion-fast) linear;
}

.ranking-list__item[data-selected='true'] {
  background: var(--powder);
  border-left: 2px solid var(--blue);
}

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

.article-card {
  grid-template-columns: minmax(105px, 0.2fr) minmax(0, 1fr) 96px;
  gap: clamp(20px, 4vw, 48px);
  padding-block: 24px;
}

.article-card__body :is(h2, h3) {
  max-width: 26ch;
  font-size: clamp(1.4rem, 2.2vw, 1.9rem);
}

.completeness-checks fieldset {
  min-inline-size: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.article-card__body p {
  max-width: 42rem;
  color: var(--quiet);
  font-size: 0.9rem;
}

.tools-callout {
  padding-block: clamp(54px, 7vw, 78px);
  border-top: 1px solid var(--rule);
}

.tools-callout__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: center;
}

.tools-callout__inner p {
  max-width: 36rem;
  margin-top: 10px;
  color: var(--quiet);
}

/* Simple index pages */

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

.simple-hero,
.page-hero,
.peptide-hero,
.tool-hero {
  padding-block: clamp(72px, 10vw, 116px);
}

.simple-hero p,
.page-hero__grid > p {
  max-width: var(--measure);
  margin-top: 18px;
  color: var(--quiet);
  font-size: 1.05rem;
}

.tools-directory {
  padding-top: 0;
}

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

.tools-directory__list > a,
.tool-index__list > a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px auto;
  min-height: 86px;
  padding: 20px 0;
  gap: 28px;
  align-items: center;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
}

.tools-directory__list strong,
.tool-index__list strong {
  font-size: 1.05rem;
}

.tools-directory__list p,
.tool-index__list p {
  max-width: 42rem;
  margin-top: 4px;
  color: var(--quiet);
  font-size: 0.87rem;
}

.tools-directory__list > a > span,
.tool-index__list > a > span {
  color: var(--quiet);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tools-directory__list b,
.tool-index__list b {
  color: var(--blue);
}

.tools-directory__boundary {
  margin-top: 28px;
  color: var(--quiet);
  font-size: 0.78rem;
}

/* Peptide finder */

.peptide-hero {
  padding-block: 96px 64px;
  border-bottom: 0;
}

.peptide-hero .page-shell--narrow,
.directory-section > .page-shell {
  width: min(calc(100% - (var(--pad) * 2)), 960px);
}

.peptide-hero__content {
  margin-inline: auto;
  text-align: left;
}

.peptide-hero__content h1 {
  max-width: 12ch;
  font-size: 4.25rem;
  line-height: 0.98;
  letter-spacing: -0.035em;
}

.peptide-hero__content > p {
  max-width: 38rem;
  margin-top: 24px;
  color: var(--body);
  font-size: 1.125rem;
}

.directory-section {
  padding-block: 48px 112px;
  background: var(--paper);
}

.directory-heading {
  display: block;
  margin-bottom: 48px;
}

.directory-heading h2 {
  font-size: 2.5rem;
  line-height: 1.04;
}

.directory-heading p {
  max-width: 39rem;
  margin-top: 12px;
  color: var(--quiet);
  font-size: 1rem;
}

.directory-layout {
  display: block;
  background: var(--paper);
  border: 0;
}

.goal-panel {
  display: grid;
  gap: 32px;
  background: var(--paper);
  border: 0;
}

.directory-search {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(300px, 1.2fr);
  gap: 32px;
  padding: 24px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 8px;
}

.directory-search label {
  display: block;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 700;
}

.directory-search p {
  max-width: 26rem;
  margin-top: 4px;
  color: var(--quiet);
  font-size: 0.85rem;
}

.directory-search input {
  width: 100%;
  min-height: 52px;
  background: var(--paper);
  font-size: 1rem;
}

.goal-panel__header {
  display: flex;
  min-height: 0;
  padding: 0;
  align-items: end;
  justify-content: space-between;
  color: var(--quiet);
  border: 0;
}

.goal-panel__header h3 {
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.goal-panel__header p {
  margin-top: 4px;
  color: var(--quiet);
  font-size: 0.85rem;
}

.goal-panel__header > span {
  font-size: 0.75rem;
  white-space: nowrap;
}

.goal-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.goal-list__item {
  display: inline-flex;
  width: auto;
  min-height: 44px;
  padding: 10px 14px;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  transition:
    background-color var(--motion-fast) linear,
    border-color var(--motion-fast) linear,
    color var(--motion-fast) linear,
    transform 80ms linear;
}

.goal-list__item span:first-child {
  font-size: 0.85rem;
  line-height: 1.25;
}

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

.goal-list__item[aria-pressed='true'] {
  background: var(--powder);
  color: var(--ink);
  border-color: var(--blue);
  box-shadow: none;
}

.goal-list__item:active {
  transform: scale(0.985);
}

.goal-more {
  min-width: 0;
  border: 0;
}

.goal-more > summary {
  min-height: 44px;
  padding: 11px 0;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 700;
}

.goal-more > summary span {
  margin-left: 8px;
  color: var(--quiet);
  font-weight: 400;
}

.goal-more[open] > summary {
  margin-bottom: 12px;
}

.goal-panel__secondary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: start;
  border-top: 1px solid var(--rule);
}

.goal-list__item--all {
  margin-top: 8px;
}

.directory-results {
  min-width: 0;
  margin-top: 80px;
  background: var(--paper);
}

.directory-results__header {
  min-height: 0;
  padding: 0 0 20px;
  align-items: end;
  border-bottom: 1px solid var(--ink);
}

.directory-results__label {
  display: block;
  margin-bottom: 6px;
  color: var(--quiet);
  font-size: 0.78rem;
  font-weight: 700;
}

.directory-results__header h3 {
  font-size: 2rem;
  line-height: 1.06;
}

.directory-results__header > span {
  color: var(--quiet);
  font-size: 0.78rem;
  white-space: nowrap;
}

.directory-filter-disclosure {
  border-bottom: 1px solid var(--rule);
}

.directory-filter-disclosure > summary {
  min-height: 48px;
  padding: 14px 0;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 700;
}

.directory-facets {
  grid-template-columns: minmax(150px, 220px) minmax(180px, 240px) auto;
  padding: 0 0 20px;
  border-bottom: 0;
}

.compound-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding-top: 24px;
  border-top: 0;
}

.compound-card {
  display: flex;
  min-height: 320px;
  padding: 24px;
  flex-direction: column;
  gap: 20px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 8px;
  transition:
    border-color var(--motion-fast) linear,
    transform 80ms linear;
}

.compound-card:last-child {
  border-bottom: 1px solid var(--rule);
}

.compound-card__identity {
  display: flex;
  min-width: 0;
  flex-direction: row;
  gap: 20px;
  align-items: start;
  justify-content: space-between;
}

.compound-card__identity h3 {
  margin-top: 4px;
  font-size: 1.55rem;
  line-height: 1.08;
}

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

.compound-card__kind,
.compound-card__fit {
  color: var(--quiet);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
}

.compound-card__fit {
  max-width: 12rem;
  margin-top: 0;
  text-align: right;
}

.compound-card__description {
  max-width: 34rem;
  color: var(--body);
  font-size: 0.95rem;
  line-height: 1.55;
  text-wrap: pretty;
}

.compound-card__evidence {
  display: block;
  margin-top: auto;
}

.compound-card__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.compound-card__facts div {
  display: block;
  padding: 0;
  border: 0;
}

.compound-card__facts dt {
  color: var(--quiet);
  font-size: 0.68rem;
  letter-spacing: 0;
  text-transform: none;
}

.compound-card__facts dd {
  margin-top: 4px;
  color: var(--body);
  font-size: 0.78rem;
  line-height: 1.4;
}

.compound-card__actions {
  display: flex;
  gap: 12px 20px;
  margin-top: 20px;
  align-items: center;
  justify-content: space-between;
}

.compound-card__actions .text-link,
.compound-card__actions .text-button {
  font-size: 0.76rem;
}

.empty-state {
  padding: 48px 0;
  color: var(--quiet);
}

.compare-tray {
  max-width: 900px;
  min-height: 62px;
  padding: 10px 14px;
  background: var(--paper);
  border-color: var(--rule-strong);
}

/* Tool pages */

.tool-hero__grid,
.page-hero__grid {
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.8fr);
  gap: clamp(44px, 8vw, 104px);
}

.tool-hero__copy p {
  color: var(--quiet);
}

.scope-line {
  margin-top: 14px;
  padding-top: 14px;
  color: var(--quiet);
  border-top: 1px solid var(--rule);
  font-size: 0.78rem;
}

.calculator-page,
.compatibility-section,
.completeness-section {
  background: var(--paper);
}

.calculator-heading {
  margin-bottom: 38px;
  margin-inline: auto;
}

.calculator-heading h1 {
  max-width: 14ch;
}

.calculator-layout {
  grid-template-columns: minmax(0, 1fr) minmax(330px, 0.82fr);
  gap: 22px;
  background: var(--paper);
  border: 0;
}

.calculator-form,
.calculator-result {
  background: var(--panel);
  border: 1px solid var(--rule);
}

.calculator-form {
  gap: 22px 16px;
  padding: clamp(24px, 4vw, 42px);
  border-right: 1px solid var(--rule);
}

.calculator-result {
  padding: clamp(24px, 4vw, 42px);
}

.calculator-result__amount {
  margin-top: 20px;
  font-size: clamp(3rem, 6vw, 4.7rem);
  letter-spacing: -0.05em;
}

.syringe-track span {
  background: var(--blue);
  transition: transform var(--motion-state) var(--ease-out);
}

.calculator-notes {
  margin-top: 20px;
  background: var(--paper);
  border-color: var(--rule);
}

.accordion {
  border-color: var(--rule);
}

.accordion > button {
  background: var(--panel);
}

.compatibility-section {
  padding-top: clamp(54px, 7vw, 82px);
}

.demo-notice {
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 12px 14px;
  background: var(--powder);
  border: 1px solid var(--rule-strong);
  border-bottom: 0;
  font-size: 0.76rem;
}

.compatibility-workspace {
  grid-template-columns: minmax(0, 1fr) minmax(330px, 0.82fr);
  gap: 0;
  background: var(--paper);
  border-color: var(--rule-strong);
}

.compatibility-form,
.compatibility-result {
  padding: clamp(26px, 4vw, 44px);
}

.compatibility-form {
  border-right-color: var(--rule-strong);
}

.compatibility-form__heading h2 {
  max-width: 18ch;
  font-size: clamp(1.7rem, 3vw, 2.2rem);
}

.compatibility-form__heading p {
  max-width: 34rem;
  color: var(--quiet);
}

.compatibility-form--simple > .compatibility-pair-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
  padding-top: 22px;
}

.compatibility-form__actions {
  margin-top: 24px;
  padding-top: 20px;
  border-top-color: var(--rule);
}

.advanced-evidence-mode {
  margin-top: 28px;
  border-top: 1px solid var(--rule);
}

.advanced-evidence-mode > summary {
  padding-inline: 0;
  color: var(--quiet);
}

.advanced-evidence-mode__intro {
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--rule);
}

.advanced-evidence-mode__intro p {
  color: var(--quiet);
  font-size: 0.8rem;
}

.advanced-evidence-mode .compatibility-form fieldset,
.advanced-evidence-mode fieldset {
  margin-top: 24px;
  padding-top: 20px;
}

.compatibility-result {
  background: var(--paper);
}

.compatibility-result h2 {
  margin-top: 20px;
  font-size: clamp(2rem, 3.4vw, 2.8rem);
}

.compatibility-result > p {
  max-width: 34rem;
  color: var(--quiet);
}

.result-pair {
  margin-top: 22px;
  border-top-color: var(--ink);
  border-bottom-color: var(--rule);
}

.result-explanation {
  margin-top: 28px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.result-explanation > summary {
  padding-inline: 0;
}

.result-explanation__body {
  padding-bottom: 20px;
}

.result-ledger,
.result-evidence,
.result-sources,
.result-endpoints,
.result-failures,
.not-assessed {
  margin-top: 22px;
}

.result-version {
  color: var(--quiet);
  border-top-color: var(--rule);
}

.method-section {
  padding-top: clamp(64px, 8vw, 90px);
  border-bottom-color: var(--rule);
}

.method-grid {
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(42px, 8vw, 96px);
}

.method-ledger {
  border-top-color: var(--ink);
}

.method-ledger > div {
  border-bottom-color: var(--rule);
}

.source-notes--collapsed {
  margin-top: 38px;
  padding-top: 0;
  border-top: 1px solid var(--rule);
}

.source-notes--collapsed > summary {
  padding-inline: 0;
}

.source-notes--collapsed ul {
  padding-bottom: 12px;
}

/* Research, practicals, stacks, and profiles */

.practical-map,
.method-section,
.research-index {
  background: var(--paper);
}

.source-questions {
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.source-questions__layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.48fr) minmax(0, 1.52fr);
  gap: clamp(44px, 8vw, 96px);
  align-items: start;
}

.source-questions__intro p {
  max-width: 24rem;
  margin-top: 16px;
  color: var(--quiet);
}

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

.source-questions__list details {
  border-bottom: 1px solid var(--rule);
}

.source-questions__list summary {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  min-height: 68px;
  padding: 18px 0;
  gap: 14px;
  align-items: center;
  cursor: pointer;
  list-style: none;
}

.source-questions__list summary::-webkit-details-marker,
.stack-card__summary::-webkit-details-marker {
  display: none;
}

.source-questions__list summary > span {
  color: var(--quiet);
  font-size: 0.68rem;
  font-weight: 700;
}

.source-questions__list summary strong {
  color: var(--ink);
  font-size: 1rem;
}

.source-questions__list summary b,
.stack-card__summary > b {
  color: var(--blue);
  font-size: 1rem;
  transition: transform var(--motion-fast) var(--ease-out);
}

.source-questions__list details[open] summary b,
.stack-card[open] .stack-card__summary > b {
  transform: rotate(45deg);
}

.source-questions__list details > p {
  max-width: var(--measure);
  padding: 0 38px 22px 54px;
  color: var(--quiet);
  font-size: 0.9rem;
}

.simple-next {
  padding-block: clamp(38px, 6vw, 58px);
}

.practical-map__heading {
  max-width: var(--narrow);
}

.practical-map__grid {
  gap: 0;
  border-top-color: var(--ink);
}

.practical-map article {
  padding: 22px;
  border-color: var(--rule);
}

.practical-map svg {
  height: 82px;
  margin-block: 18px 24px;
  opacity: 0.72;
}

.practical-map h3 {
  font-size: 1.35rem;
}

.practical-map article > p {
  min-height: 118px;
  color: var(--quiet);
  font-size: 0.8rem;
}

.completeness-layout {
  background: var(--paper);
  border-color: var(--rule-strong);
}

.completeness-intro {
  border-right-color: var(--rule-strong);
}

.completeness-track span {
  background: var(--panel);
  border-color: var(--rule);
}

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

.research-toolbar {
  border-bottom-color: var(--rule);
}

.research-toolbar__topics {
  color: var(--quiet);
  font-size: 0.74rem;
}

.research-newsletter {
  background: var(--panel);
  border-top: 1px solid var(--rule);
}

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

.stack-preview__layout,
.stack-library__layout {
  grid-template-columns: minmax(220px, 0.48fr) minmax(0, 1.52fr);
  gap: clamp(44px, 8vw, 96px);
}

.stack-card {
  display: block;
  padding: 0;
}

.stack-card__summary {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  min-height: 82px;
  padding: 20px 0;
  gap: 16px;
  align-items: center;
  cursor: pointer;
  list-style: none;
}

.stack-card__summary > span:nth-child(2) {
  display: block;
  min-width: 0;
}

.stack-card__summary strong {
  display: block;
  color: var(--ink);
  font-size: clamp(1.25rem, 2.2vw, 1.7rem);
  letter-spacing: -0.025em;
  line-height: 1.15;
}

.stack-card__summary small {
  display: block;
  max-width: 42rem;
  margin-top: 5px;
  color: var(--quiet);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.4;
  text-transform: uppercase;
}

.stack-card__content {
  padding: 0 0 28px 58px;
}

.stack-card__content > .tag-list {
  margin-top: 0;
}

.stack-card__matrix {
  margin-top: 18px;
}

.stack-card__matrix > div {
  padding-top: 13px;
}

.stack-card__matrix p {
  font-size: 0.78rem;
}

.profile-hero {
  padding-block: clamp(68px, 9vw, 108px);
}

.profile-hero__inner {
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.78fr);
  gap: clamp(42px, 8vw, 96px);
}

.profile-hero h1 {
  max-width: 16ch;
  font-size: clamp(3rem, 6vw, 4.5rem);
}

.profile-hero__inner > div:first-child > p {
  max-width: 38rem;
  color: var(--quiet);
  font-size: 1.02rem;
}

.profile-hero__actions {
  margin-top: 24px;
}

.profile-tabs {
  top: var(--header-height);
  border-bottom-color: var(--rule);
}

.profile-tabs button {
  min-height: 48px;
  padding-inline: 16px;
  border-bottom-width: 1px;
  transition:
    border-color var(--motion-fast) linear,
    color var(--motion-fast) linear;
}

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

.profile-intro {
  max-width: var(--narrow);
}

.profile-intro > p {
  max-width: var(--measure);
  color: var(--quiet);
  font-size: 1rem;
}

.profile-intro blockquote {
  padding: 16px 0 16px 20px;
  border-left: 2px solid var(--blue);
  font-size: 1rem;
}

.profile-snapshot-grid {
  grid-template-columns: repeat(2, 1fr);
  max-width: 820px;
  margin-top: 42px;
  border-top-color: var(--ink);
}

.research-timeline,
.source-ledger,
.profile-stack-links {
  border-top-color: var(--ink);
}

/* Dialogs and footer */

.modal {
  padding: clamp(28px, 5vw, 50px);
  border-color: var(--rule-strong);
  border-radius: 2px;
}

.modal__close {
  border-color: var(--rule-strong);
  border-radius: 2px;
}

.ai-gate blockquote {
  background: var(--panel);
  border-left-color: var(--blue);
}

.site-footer {
  grid-template-columns: minmax(220px, 0.8fr) auto minmax(260px, 1fr);
  padding: 44px var(--pad);
  gap: clamp(30px, 6vw, 72px);
  border-top-color: var(--rule-strong);
}

.site-footer__brand strong {
  margin-top: 5px;
  font-size: 1rem;
  line-height: 1.35;
}

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

.site-footer__note {
  color: var(--quiet);
  font-size: 0.72rem;
}

/* Hover is deliberately unavailable to coarse and touch pointers. */

@media (hover: hover) and (pointer: fine) {
  .site-nav__link:hover {
    color: var(--ink);
  }

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

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

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

  .start-paths > a:hover strong,
  .tools-directory__list > a:hover strong,
  .tool-index__list > a:hover strong,
  .article-card__body :is(h2, h3) a:hover,
  .compound-card__identity h3 a:hover {
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.18em;
  }

  .ranking-list__item:hover,
  .goal-list__item:hover {
    background: var(--panel);
  }

  .compound-card:hover {
    border-color: var(--rule-strong);
  }

  .ranking-list__item[data-selected='true']:hover,
  .goal-list__item[aria-pressed='true']:hover {
    background: var(--powder);
  }
}

@media (max-width: 980px) {
  .ranking-layout,
  .calculator-layout,
  .compatibility-workspace,
  .completeness-layout,
  .profile-hero__inner {
    grid-template-columns: 1fr;
  }

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

  .directory-layout {
    grid-template-columns: minmax(220px, 270px) minmax(0, 1fr);
    gap: 32px;
  }

  .compound-card {
    grid-template-columns: minmax(130px, 0.42fr) minmax(0, 1fr);
  }

  .compound-card__evidence {
    grid-column: 2;
    display: block;
  }

  .profile-hero__aside {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}

@media (max-width: 760px) {
  :root {
    --pad: 20px;
    --section: 64px;
    --header-height: 62px;
  }

  h1 {
    font-size: clamp(2.55rem, 12vw, 3.35rem);
  }

  h2 {
    font-size: clamp(1.85rem, 8vw, 2.35rem);
  }

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

  .wordmark > span:last-child {
    display: inline;
  }

  .header-ai {
    grid-column: 3;
    margin-right: 8px;
  }

  .nav-toggle {
    grid-column: 4;
  }

  .site-nav {
    gap: 0;
  }

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

  .home-hero__art {
    top: 0;
    right: -42%;
    width: 125vw;
    height: 100%;
    opacity: 0.045;
  }

  .home-hero__content {
    padding-block: 76px;
  }

  .home-hero h1 {
    font-size: clamp(2.8rem, 13vw, 3.85rem);
  }

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

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

  .start-section__heading,
  .directory-heading,
  .page-hero__grid,
  .tool-hero__grid,
  .method-grid,
  .profile-evidence-grid,
  .source-questions__layout,
  .stack-preview__layout,
  .stack-library__layout {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .start-paths > a {
    grid-template-columns: 1fr auto;
    gap: 6px 16px;
  }

  .start-paths span {
    grid-column: 1;
  }

  .start-paths > a::after {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .ranking-feature {
    grid-template-columns: 34px minmax(0, 1fr);
    padding-right: 0;
  }

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

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

  .article-card__meta {
    grid-column: 1 / -1;
  }

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

  .tools-callout__inner,
  .tools-directory__list > a,
  .tool-index__list > a {
    grid-template-columns: 1fr auto;
  }

  .tools-directory__list > a > span,
  .tool-index__list > a > span {
    grid-column: 1;
  }

  .tools-directory__list > a > div,
  .tool-index__list > a > div {
    grid-column: 1;
  }

  .tools-directory__list b,
  .tool-index__list b {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .directory-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .goal-panel {
    max-height: none;
    overflow: visible;
    border: 0;
  }

  .peptide-hero {
    padding-block: 72px 48px;
  }

  .peptide-hero__content h1 {
    font-size: 3rem;
  }

  .peptide-hero__content > p {
    font-size: 1rem;
  }

  .directory-section {
    padding-block: 40px 80px;
  }

  .directory-heading h2 {
    font-size: 2rem;
  }

  .directory-search {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px;
  }

  .goal-panel__header {
    align-items: start;
    flex-direction: column;
    gap: 8px;
  }

  .goal-list__item {
    width: 100%;
  }

  .goal-panel__secondary {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .directory-results {
    margin-top: 64px;
  }

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

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

  .compound-card {
    min-height: 0;
    gap: 20px;
  }

  .compound-card__identity {
    flex-direction: row;
    justify-content: space-between;
    gap: 18px;
  }

  .compound-card__fit {
    text-align: right;
  }

  .compound-card__evidence {
    grid-column: auto;
  }

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

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

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

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

  .stack-card__content {
    padding-left: 0;
  }

  .site-footer {
    grid-template-columns: 1fr;
    gap: 26px;
  }
}

@media (max-width: 500px) {
  .site-header {
    grid-template-columns: auto 1fr auto;
  }

  .header-ai {
    display: none;
  }

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

  .wordmark {
    font-size: 0.88rem;
  }

  .home-hero h1,
  h1 {
    font-size: clamp(2.4rem, 13vw, 3rem);
  }

  .tools-callout__inner {
    grid-template-columns: 1fr;
  }

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

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

  .compare-tray {
    right: 10px;
    bottom: 10px;
    left: 10px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .home-hero__art,
  .header-ai,
  .nav-toggle,
  .compare-tray {
    display: none !important;
  }

  body,
  .calculator-page,
  .compatibility-section,
  .completeness-section {
    background: #fff !important;
  }
}

/* Compound editorial illustrations */

.compound-illustration {
  margin: 0 0 30px;
  color: var(--ink);
}

.compound-illustration svg {
  display: block;
  width: 100%;
  max-height: 180px;
  color: var(--ink);
}

.compound-illustration svg g {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.compound-illustration svg circle {
  fill: var(--powder);
  stroke: var(--blue);
}

.compound-illustration figcaption {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.compound-illustration figcaption strong {
  color: var(--ink);
  font-weight: 600;
}

@media (max-width: 760px) {
  .compound-illustration {
    max-width: 420px;
    margin-top: 18px;
  }
}