:root {
  --ink: #12161b;
  --muted: #53606b;
  --green: #466f00;
  --lime: #76b900;
  --line: #dce2e7;
  --wash: #f0f3f7;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  margin: 0;
  color: var(--ink);
  font: 17px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

a {
  color: var(--green);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 5px;
}

.container {
  max-width: 1120px;
  margin: auto;
  padding: 0 32px;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, .99);
  border-bottom: 1px solid var(--line);
}

nav {
  max-width: 1250px;
  margin: auto;
  min-height: 66px;
  padding: 12px 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-weight: 750;
  letter-spacing: -.6px;
  color: var(--ink);
  font-size: 23px;
  display: flex;
  align-items: center;
  gap: 10px;
}

#nav-links {
  display: flex;
  gap: 27px;
}

#nav-links a {
  font-size: 14px;
  color: #34414c;
}

#menu {
  display: none;
}

.skip {
  position: absolute;
  top: -100px;
  background: #fff;
  padding: 10px;
  z-index: 30;
}

.skip:focus {
  top: 0;
}

.hero-bg {
  background: linear-gradient(180deg, #edf2f6 0%, #f3f5f8 65%, #fff 100%);
}

section {
  padding-top: 76px;
  padding-bottom: 76px;
}

/* .container sets padding: 0 32px and would otherwise zero the section's
   vertical padding. Only the bottom is restored: the top spacing of these
   sections already comes from the preceding section. */
section.container:not(.hero) {
  padding-bottom: 76px;
}

.hero {
  text-align: center;
  padding-top: 72px;
  padding-bottom: 52px;
}

.eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.7px;
  color: var(--green);
  margin: 0 0 14px;
}

.hero h1 {
  font-size: clamp(58px, 8vw, 88px);
  letter-spacing: -4px;
  line-height: 1.1;
  margin: 22px 0 18px;
}

.subtitle {
  font-size: clamp(26px, 4vw, 39px);
  line-height: 1.28;
  font-weight: 650;
  letter-spacing: -1.2px;
  margin: 0;
}

.hero-description {
  font-size: 18px;
  color: var(--muted);
  margin: 24px auto 28px;
  text-wrap: balance;
}

.buttons {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  border: 1px solid #8a98a3;
  border-radius: 7px;
  background: white;
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 650;
  color: var(--ink);
}

.button:hover {
  border-color: var(--green);
  text-decoration: none;
  background: #f6faef;
}

.button.primary {
  background: var(--lime);
  border-color: var(--lime);
  color: #142000;
}

.small {
  font-size: 12px;
  font-weight: 400;
}

.highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
  text-align: left;
  margin-top: 52px;
}

.highlights article {
  background: #ffffffc9;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 23px 20px;
}

.tag {
  font-size: 12px;
  letter-spacing: 1.7px;
  color: var(--green);
  font-weight: 700;
}

.highlights .card-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -.3px;
  margin: 11px 0 8px;
  color: var(--ink);
}

.highlights p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  gap: 19px;
  margin-bottom: 27px;
}

.number {
  border-top: 2px solid var(--lime);
  padding-top: 9px;
  min-width: 33px;
  font-size: 14px;
  color: var(--muted);
}

.section-heading .eyebrow {
  margin: 0 0 6px;
}

h2 {
  font-size: 32px;
  line-height: 1.25;
  letter-spacing: -.9px;
  margin: 0;
}

h3 {
  font-size: 23px;
  line-height: 1.35;
  letter-spacing: -.4px;
  margin: 12px 0;
}

p {
  margin: 0 0 19px;
}

.lead {
  font-size: 22px;
  line-height: 1.55;
  color: #34414c;
  max-width: 920px;
}

.text-section {
  max-width: 980px;
}

.tinted {
  background: linear-gradient(180deg, var(--wash), #fff 85%);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin: 36px 0;
}

.steps article {
  border-top: 1px solid #bbc7cd;
  padding-top: 15px;
}

.steps article > span {
  font-size: 13px;
  color: var(--green);
  font-weight: 750;
}

.steps h3 {
  font-size: 17px;
}

.steps p {
  font-size: 14px;
  color: var(--muted);
}

figure {
  margin: 32px 0 0;
}

figure > a {
  display: block;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
  overflow: hidden;
}

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

figcaption {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  margin: 16px 5px 0;
}

figcaption a {
  white-space: nowrap;
}

.subsection {
  margin-top: 70px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.subsection h3 {
  font-size: 28px;
  margin-top: 0;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 32px 0;
}

.metrics > div {
  border-left: 3px solid var(--lime);
  padding: 4px 0 4px 20px;
}

.metrics strong {
  display: block;
  font-size: 36px;
  line-height: 1.3;
  letter-spacing: -1px;
}

.metrics span {
  display: block;
  font-size: 13px;
  color: var(--muted);
  max-width: 240px;
  margin-top: 7px;
}

.metrics small {
  font-size: 18px;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.resource-grid > a,
.resource-card {
  display: block;
  padding: 25px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  transition: border-color .15s;
}

.resource-grid > a:hover {
  border-color: var(--green);
  text-decoration: none;
}

.resource-grid span {
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--green);
  font-weight: 700;
}

.resource-grid h3 {
  font-size: 20px;
}

.resource-grid p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}

footer {
  background: var(--wash);
  padding: 38px 0;
}

footer p {
  font-size: 13px;
  margin: 9px 0;
  color: var(--muted);
}

footer .legal a {
  color: var(--muted);
  text-decoration: underline;
}

footer .legal {
  line-height: 1.9;
}

@media (max-width: 850px) {
  .highlights,
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  #nav-links {
    gap: 16px;
  }

  .metrics strong {
    font-size: 28px;
  }

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

@media (max-width: 620px) {
  .container {
    padding-left: 21px;
    padding-right: 21px;
  }

  section {
    padding-top: 48px;
    padding-bottom: 48px;
  }

  section.container:not(.hero) {
    padding-bottom: 48px;
  }

  nav {
    padding: 12px 21px;
    flex-wrap: wrap;
  }

  #menu {
    display: block;
    background: white;
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 8px 12px;
    font: inherit;
    font-size: 13px;
  }

  #nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0;
  }

  #nav-links.open {
    display: flex;
  }

  #nav-links a {
    padding: 10px 0;
  }

  .hero {
    padding-top: 48px;
  }

  .hero h1 {
    letter-spacing: -2px;
  }

  .hero-description {
    font-size: 16px;
  }

  .highlights {
    gap: 10px;
    margin-top: 35px;
  }

  .highlights article {
    padding: 16px;
  }

  .highlights .card-title {
    font-size: 15px;
  }

  .highlights p {
    font-size: 13px;
  }

  .metrics {
    grid-template-columns: 1fr;
    gap: 19px;
  }

  .metrics span {
    max-width: none;
  }

  .steps {
    gap: 20px;
  }

  h2 {
    font-size: 27px;
  }

  .lead {
    font-size: 19px;
  }

  figure > a {
    padding: 7px;
    border-radius: 5px;
  }

  .section-heading {
    gap: 12px;
  }

  .desktop {
    display: none;
  }

  .subsection {
    margin-top: 44px;
  }

  .button {
    padding: 10px 15px;
  }
}

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

  * {
    transition: none !important;
  }
}

.supplement-links {
  margin-top: 24px;
  font-size: 15px;
}

.cam-metrics {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cam-metrics strong {
  font-size: 30px;
}

@media (max-width: 700px) {
  .cam-metrics {
    grid-template-columns: 1fr;
  }
}

.tldr {
  background: #f3f7ec;
  border-left: 4px solid var(--lime);
  border-radius: 0 8px 8px 0;
  padding: 24px 28px;
  margin-bottom: 46px;
}

.tldr h2 {
  font-size: 19px;
  letter-spacing: 0;
  margin-bottom: 12px;
}

.tldr p {
  margin: 0;
  font-size: 17px;
}

.button.disabled {
  background: #f3f5f7;
  color: #53606b;
  border-style: dashed;
  cursor: default;
}

.button.disabled:hover {
  background: #f3f5f7;
  border-color: #8a98a3;
  text-decoration: none;
}

.fig-cue {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  color: var(--green);
  text-align: right;
}

.resource-card.disabled {
  border: 1px dashed #8a98a3;
  background: #f7f9fb;
  color: var(--muted);
  padding: 25px;
  border-radius: 10px;
}

.resource-card.disabled h3 {
  color: var(--ink);
}

.caveats {
  margin-top: 40px;
  padding: 22px 26px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  border-radius: 0 10px 10px 0;
  background: #fff;
}

.caveats h3 {
  font-size: 19px;
  margin: 0 0 10px;
}

.caveats ul {
  margin: 0;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.65;
  color: #34414c;
}

.caveats li {
  margin-bottom: 6px;
}

.references {
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.references h3 {
  font-size: 19px;
  margin: 0 0 12px;
}

.references ul {
  margin: 0;
  padding-left: 20px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.references li {
  margin-bottom: 6px;
}

@media (max-width: 850px) {
  .resource-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  figure > a {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-x pinch-zoom;
  }

  figure img {
    width: 760px;
    max-width: none;
  }

  .fig-cue {
    text-align: left;
    position: sticky;
    left: 0;
  }
}

.term {
  text-decoration: underline dotted #6c7a85;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  cursor: help;
  border-radius: 2px;
}

.term:hover,
.term[aria-expanded="true"] {
  text-decoration-color: var(--green);
  background: #f0f6e4;
}

.term:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.term-pop {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 40;
  width: max-content;
  max-width: min(300px, calc(100vw - 24px));
  padding: 9px 12px;
  border-radius: 8px;
  background: #12161b;
  color: #fff;
  font-size: 14px;
  line-height: 1.45;
  font-weight: 400;
  box-shadow: 0 6px 24px rgba(0, 0, 0, .22);
  pointer-events: none;
}

.term-pop[hidden] {
  display: none;
}

.term-pop b {
  color: #b6e36a;
  font-weight: 650;
}

.metrics .term {
  display: inline;
  max-width: none;
  margin: 0;
  font-size: inherit;
}

.metrics .picomolar-metric {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
}

.metrics .picomolar-metric small {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0;
}