:root {
  --navy:#122d3d;
  --ink:#162d38;
  --muted:#536a71;
  --teal:#167f7a;
  --dark-teal:#0a6661;
  --lime:#c4eba8;
  --cream:#f6f6ef;
  --white:#fff;
  --line:#dbe6e1;
  --orange:#f4bc78;
  --red:#9b3e34;
  --ring:#f49c4f;
  --shadow:0 22px 60px rgba(17,46,50,.09);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  font-size:16px;
  color-scheme:light
}
* {
  box-sizing:border-box
}
html {
  scroll-behavior:smooth;
  scroll-padding-top:94px
}
body {
  margin:0;
  background:var(--cream);
  color:var(--ink);
  line-height:1.6
}
button,input,textarea,select {
  font:inherit
}
button {
  cursor:pointer
}
button:disabled {
  cursor:not-allowed;
  opacity:.56
}
a {
  color:inherit
}
svg {
  max-width:100%
}
:focus-visible {
  outline:3px solid var(--ring);
  outline-offset:3px
}
::selection {
  background:var(--lime);
  color:#122d3d
}
.container {
  width:min(100% - 52px,1240px);
  margin-inline:auto
}
.visually-hidden {
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0
}
.skip {
  position:fixed;
  z-index:150;
  top:-100px;
  left:20px;
  padding:12px 16px;
  background:#fff;
  color:var(--navy);
  border-radius:8px
}
.skip:focus {
  top:15px
}
.site-header {
  background:#112c3b;
  color:#fff;
  position:sticky;
  top:0;
  z-index:50;
  border-bottom:1px solid #42606a
}
.header-inner {
  height:82px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:20px
}
.logo {
  text-decoration:none;
  display:flex;
  align-items:center;
  gap:12px;
  font-weight:840;
  letter-spacing:-.045em;
  line-height:1.05;
  font-size:25px;
  white-space:nowrap
}
.logo-accent,.footer-logo span {
  color:var(--lime)
}
.logo small {
  display:block;
  font-size:10px;
  letter-spacing:.015em;
  font-weight:550;
  margin-top:5px;
  color:#aec9c9
}
.logo-mark {
  width:43px;
  height:43px;
  border-radius:13px;
  background:#c4eba8;
  display:grid;
  place-items:center;
  flex:none
}
.logo-mark svg {
  width:28px;
  fill:none;
  stroke:#193a3c;
  stroke-width:3.1;
  stroke-linecap:round;
  stroke-linejoin:round
}
.primary-nav {
  display:flex;
  align-items:center;
  gap:27px
}
.primary-nav a {
  text-decoration:none;
  font-size:13px;
  font-weight:650;
  color:#e5efeb
}
.primary-nav a:hover {
  color:var(--lime)
}
.header-actions {
  display:flex;
  gap:12px
}
.header-voice {
  border:1px solid #5a8584;
  border-radius:100px;
  background:#1e4650;
  color:#f5faf5;
  font-size:12px;
  font-weight:720;
  padding:10px 16px;
  white-space:nowrap
}
.header-voice:hover {
  background:#2c5962
}
.menu-button,.mobile-menu {
  display:none
}
.hero {
  background:#112c3b;
  color:#fff;
  position:relative;
  overflow:hidden
}
.hero:before {
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(ellipse at 65% 52%,rgba(72,150,137,.28),transparent 40%),linear-gradient(115deg,transparent 60%,rgba(83,173,150,.08));
}
.hero-grid {
  min-height:575px;
  display:grid;
  grid-template-columns:1.1fr .9fr;
  align-items:center;
  gap:30px;
  position:relative
}
.hero-copy {
  padding:68px 0 70px;
  z-index:1
}
.eyebrow {
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--dark-teal);
  font-size:11px;
  letter-spacing:.19em;
  font-weight:840
}
.eyebrow-light {
  color:#bee6a7
}
.pulse-dot {
  width:8px;
  height:8px;
  border-radius:50%;
  background:#b7e99f;
  box-shadow:0 0 0 5px #a2dc9140
}
.hero h1 {
  font-size:clamp(3.5rem,6.2vw,6.4rem);
  line-height:1.04;
  letter-spacing:-.07em;
  margin:24px 0 24px;
  font-weight:780
}
.hero h1 em,.study-grid em {
  font-family:Georgia,serif;
  color:var(--lime);
  font-weight:450
}
.hero-copy>p {
  font-size:18px;
  max-width:560px;
  color:#cbdfe0;
  margin:0 0 30px
}
.hero-actions {
  display:flex;
  gap:12px;
  flex-wrap:wrap
}
.button {
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:20px;
  min-height:52px;
  border-radius:11px;
  padding:11px 20px;
  border:1px solid transparent;
  font-weight:760;
  text-decoration:none;
  line-height:1.2;
  transition:transform .2s,background .2s,border-color .2s
}
.button:hover:not(:disabled) {
  transform:translateY(-2px)
}
.button-bright {
  background:var(--lime);
  color:#173937
}
.button-bright:hover {
  background:#e1f5ca
}
.button-glass {
  background:#ffffff16;
  color:#fff;
  border-color:#789597
}
.button-glass:hover {
  background:#ffffff25
}
.hero-foot {
  margin-top:58px;
  display:flex;
  gap:28px;
  flex-wrap:wrap;
  color:#c1d6d6;
  font-size:12px;
  letter-spacing:.03em
}
.hero-foot span+span {
  border-left:1px solid #486975;
  padding-left:28px
}
.hero-foot b {
  display:block;
  color:#fff;
  font-size:25px;
  line-height:1.1;
  letter-spacing:-.04em
}
.hero-art {
  height:470px;
  position:relative;
  display:grid;
  place-items:center;
  isolation:isolate
}
.art-ring {
  position:absolute;
  border:1px solid #4e939552;
  border-radius:50%
}
.ring-one {
  width:440px;
  height:440px
}
.ring-two {
  width:325px;
  height:325px;
  border-style:dashed
}
.art-orbit {
  position:absolute;
  width:12px;
  height:12px;
  border-radius:50%;
  box-shadow:0 0 0 8px #89ceac22
}
.orbit-one {
  background:#c4eba8;
  left:14%;
  top:16%
}
.orbit-two {
  background:#eab97e;
  right:15%;
  bottom:18%
}
.art-center {
  position:relative;
  width:286px;
  height:286px;
  border:1px solid #69b5a789;
  background:linear-gradient(145deg,#25616a,#123a4c);
  border-radius:34px;
  box-shadow:0 35px 80px #071c2670;
  display:grid;
  place-items:center;
  transform:rotate(-6deg)
}
.art-center svg {
  width:175px;
  fill:none;
  stroke:#cde8ca;
  stroke-width:5;
  stroke-linecap:round;
  stroke-linejoin:round
}
.art-center svg .liquid {
  fill:#79c5b5;
  stroke:none
}
.art-center svg circle {
  fill:#eaf6d1;
  stroke:none
}
.art-signal {
  position:absolute;
  padding:8px 13px;
  background:#f6f8ee;
  color:#234444;
  border:1px solid #aed4c6;
  box-shadow:0 10px 22px #061c2440;
  border-radius:9px;
  font-size:13px;
  font-weight:850;
  transform:rotate(6deg)
}
.signal-one {
  top:25px;
  right:-62px
}
.signal-two {
  left:-75px;
  top:138px
}
.signal-three {
  right:-48px;
  bottom:25px
}
.art-caption {
  position:absolute;
  bottom:5px;
  color:#a8d9d1;
  letter-spacing:.2em;
  font-size:10px;
  font-weight:780;
  display:flex;
  align-items:center;
  gap:15px
}
.bars {
  height:21px;
  display:flex;
  align-items:center;
  gap:4px
}
.bars i {
  width:3px;
  height:9px;
  background:#a5e4b1;
  border-radius:3px
}
.bars i:nth-child(2),.bars i:nth-child(6) {
  height:17px
}
.bars i:nth-child(3),.bars i:nth-child(5) {
  height:11px
}
.bars i:nth-child(4) {
  height:21px
}
.trust {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
  padding-top:28px;
  padding-bottom:22px
}
.trust>div {
  display:grid;
  grid-template-columns:42px 1fr;
  column-gap:11px;
  align-items:center;
  border:1px solid var(--line);
  background:#fff;
  border-radius:12px;
  padding:16px 13px
}
.trust strong {
  font-size:12px;
  line-height:1.2
}
.trust small {
  grid-column:2;
  font-size:11px;
  color:var(--muted);
  margin-top:3px
}
.feature-icon {
  grid-row:1/3;
  display:grid;
  place-items:center;
  color:#136f6d;
  font-size:26px;
  width:42px;
  height:42px;
  border-radius:10px;
  background:#e9f5e8
}
.section {
  padding-top:100px;
  padding-bottom:95px
}
.section-heading {
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:24px;
  margin-bottom:36px
}
.section-heading h2 {
  font-size:clamp(2rem,3.5vw,3.65rem);
  line-height:1.13;
  letter-spacing:-.06em;
  margin:10px 0 10px
}
.section-heading p {
  color:var(--muted);
  max-width:610px;
  margin:0;
  font-size:15px
}
.number-mark {
  font-size:53px;
  line-height:1;
  color:#b7c9c4;
  letter-spacing:-.07em;
  font-weight:810
}
.number-mark span {
  font-size:17px;
  color:#829b94
}
.section-lab {
  padding-top:85px
}
.lab-layout {
  display:grid;
  grid-template-columns:300px minmax(0,1fr);
  gap:18px;
  align-items:start
}
.lab-sidebar {
  position:sticky;
  top:104px;
  background:#153746;
  color:#fff;
  border-radius:18px;
  padding:24px 18px;
  box-shadow:var(--shadow)
}
.lab-sidebar h3 {
  font-size:18px;
  letter-spacing:-.04em;
  margin:4px 9px 20px
}
.lab-choice {
  display:flex;
  width:100%;
  align-items:center;
  gap:12px;
  background:transparent;
  color:#d4e5e3;
  border:1px solid transparent;
  border-radius:11px;
  text-align:left;
  padding:12px;
  line-height:1.2;
  margin:4px 0
}
.lab-choice:hover {
  background:#244e59
}
.lab-choice[aria-current=true] {
  color:#193c3d;
  background:var(--lime);
  font-weight:760
}
.choice-num {
  font-size:11px;
  min-width:27px;
  color:#88bdb4
}
.lab-choice[aria-current=true] .choice-num {
  color:#456d55
}
.lab-choice strong {
  display:block;
  font-size:13px
}
.lab-choice small {
  display:block;
  font-size:11px;
  margin-top:4px;
  font-weight:450;
  color:inherit;
  opacity:.82
}
.aside-note {
  color:#bfd2d2;
  font-size:12px;
  padding:12px 10px;
  margin:15px 0 0
}
.aside-line {
  height:1px;
  background:#3a626b;
  margin:13px 10px
}
.aside-link {
  display:flex;
  justify-content:space-between;
  color:#c5ecad;
  font-size:12px;
  text-decoration:none;
  padding:2px 10px 4px;
  font-weight:720
}
.experiment-panel {
  border:1px solid var(--line);
  background:#fff;
  border-radius:18px;
  box-shadow:var(--shadow);
  overflow:hidden;
  min-height:720px
}
.exp-header {
  padding:30px 36px 25px;
  background:linear-gradient(120deg,#edf6ed,#fafdf7);
  border-bottom:1px solid #d9e7df
}
.exp-kicker {
  font-size:11px;
  font-weight:820;
  color:#1c7773;
  letter-spacing:.17em
}
.exp-header h3 {
  font-size:clamp(1.9rem,3vw,3.1rem);
  letter-spacing:-.06em;
  line-height:1.13;
  margin:12px 0 9px
}
.exp-header p {
  color:#486369;
  margin:0;
  max-width:670px;
  font-size:15px
}
.exp-tabs {
  display:flex;
  gap:10px;
  padding:15px 34px 0;
  overflow-x:auto;
  scrollbar-width:thin
}
.exp-tab {
  flex:none;
  background:none;
  border:0;
  border-bottom:3px solid transparent;
  color:#607b7c;
  font-size:12px;
  font-weight:780;
  padding:12px 6px
}
.exp-tab[aria-selected=true] {
  color:#0d716e;
  border-color:#0d716e
}
.exp-content {
  padding:29px 36px 38px
}
.exp-content h4 {
  font-size:22px;
  letter-spacing:-.035em;
  margin:0 0 12px
}
.exp-content p {
  color:#435d65;
  line-height:1.7
}
.topic-grid {
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(230px,.9fr);
  gap:23px
}
.topic-grid p {
  margin:0 0 15px
}
.topic-visual {
  min-height:225px;
  border-radius:13px;
  border:1px solid #d5e8e0;
  background:radial-gradient(circle at center,#fff 1%,#e9f5ed 86%);
  display:grid;
  place-items:center;
  overflow:hidden
}
.topic-visual svg {
  width:100%;
  height:210px
}
.topic-visual svg text {
  font:700 17px system-ui;
  fill:#1d585f
}
.topic-visual svg .line {
  fill:none;
  stroke:#276b70;
  stroke-width:4;
  stroke-linecap:round;
  stroke-linejoin:round
}
.topic-visual svg .active {
  stroke:#d69651;
  fill:#d69651
}
.formula-block {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:15px;
  padding:17px 22px;
  margin:20px 0;
  border-radius:12px;
  background:#163b48;
  color:#fff
}
.formula-block strong {
  font-size:29px;
  letter-spacing:.03em
}
.formula-block span {
  font-size:12px;
  color:#d7e9df
}
.info-callout {
  background:#f1f7eb;
  border-left:4px solid #78ad8d;
  border-radius:7px;
  padding:14px 16px;
  font-size:13px;
  color:#294e49;
  margin:18px 0
}
.mini-title {
  font-size:13px;
  font-weight:790;
  color:#1a6d68;
  text-transform:uppercase;
  letter-spacing:.1em;
  margin:24px 0 11px
}
.learning-list {
  padding-left:21px;
  margin:10px 0;
  color:#3c5961
}
.learning-list li {
  padding-bottom:8px
}
.mode-switch {
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:10px;
  background:#f0f5f1;
  padding:8px;
  border-radius:11px;
  margin:0 0 21px
}
.mode-switch button {
  border:0;
  background:transparent;
  color:#41615f;
  padding:9px 16px;
  font-size:12px;
  font-weight:760;
  border-radius:8px
}
.mode-switch button[aria-pressed=true] {
  background:#fff;
  color:#145f5a;
  box-shadow:0 2px 8px #173b3b1b
}
.field-grid {
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:17px
}
.measure-field label {
  display:block;
  font-size:13px;
  font-weight:730;
  margin-bottom:8px
}
.input-with-unit {
  display:flex;
  border:1px solid #afc8c5;
  border-radius:10px;
  overflow:hidden;
  background:#fff
}
.input-with-unit:focus-within {
  outline:3px solid var(--ring);
  outline-offset:2px
}
.input-with-unit input {
  min-width:0;
  flex:1;
  width:100%;
  border:0;
  outline:0;
  padding:11px 13px;
  font-size:17px;
  font-weight:710;
  color:var(--navy)
}
.input-with-unit select {
  border:0;
  border-left:1px solid #d4e5e0;
  background:#f3f8f4;
  min-width:80px;
  padding:10px 9px;
  color:#245955;
  font-size:13px;
  font-weight:740
}
.measure-field small {
  display:block;
  color:var(--muted);
  font-size:11px;
  margin-top:7px
}
.measure-field [aria-invalid=true] {
  background:#fff2ed
}
.exp-actions {
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin:25px 0
}
.button-primary {
  background:#0f726d;
  color:#fff;
  border-color:#0f726d
}
.button-primary:hover {
  background:#095b57
}
.button-outline {
  border-color:#c1d7cb;
  background:#fff;
  color:#1e625e
}
.button-outline:hover {
  background:#ebf7ee
}
.button-quiet {
  background:#eef3ef;
  color:#425959
}
.button-small {
  min-height:39px;
  font-size:12px;
  padding:8px 12px;
  gap:8px
}
.form-error {
  color:#a13d32;
  font-size:13px;
  font-weight:710;
  min-height:1.3em
}
.result-box {
  background:#eff7ef;
  border:1px solid #b7d4bf;
  border-radius:12px;
  padding:21px 24px;
  margin-top:15px
}
.result-box .result-value {
  font-size:clamp(2rem,4vw,3.15rem);
  font-weight:830;
  letter-spacing:-.06em;
  line-height:1.2;
  overflow-wrap:anywhere;
  color:#11685c
}
.result-box strong {
  color:#31574e
}
.result-box p {
  margin:7px 0;
  font-size:14px
}
.result-box .result-source {
  font-size:11px;
  color:#4e7061
}
.result-box .result-actions {
  display:flex;
  gap:8px;
  flex-wrap:wrap;
  margin-top:14px
}
.quiz-option {
  display:block;
  margin:10px 0;
  padding:13px 15px;
  border:1px solid #d5e6df;
  border-radius:9px;
  color:#2e5357;
  cursor:pointer
}
.quiz-option:has(input:checked) {
  border-color:#1d827a;
  background:#e7f3ec
}
.quiz-option input {
  accent-color:#177a72;
  width:17px;
  height:17px;
  vertical-align:middle;
  margin-right:8px
}
.quiz-feedback {
  font-weight:760;
  color:#0d685c;
  min-height:22px
}
.section-method {
  background:#e8f0e9
}
.method-grid {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:14px
}
.method-card {
  background:#fff;
  padding:24px;
  border:1px solid #d7e5db;
  border-radius:13px;
  min-height:235px;
  box-shadow:0 6px 26px #193d2f0b
}
.method-count {
  font-size:10px;
  letter-spacing:.15em;
  color:#1a7069;
  font-weight:790
}
.method-icon {
  font-size:32px;
  color:#1a6e66;
  margin:21px 0 8px;
  line-height:1
}
.method-card h3 {
  font-size:18px;
  letter-spacing:-.035em;
  line-height:1.3;
  margin:0 0 8px
}
.method-card p {
  color:#566b6a;
  font-size:12px;
  line-height:1.7;
  margin:0
}
.method-note {
  display:flex;
  align-items:center;
  gap:18px;
  border:1px solid #aac6b4;
  background:#d8e9d9;
  border-radius:12px;
  margin-top:20px;
  padding:20px 23px
}
.method-note strong {
  flex:0 0 200px;
  font-size:14px
}
.method-note p {
  font-size:12px;
  margin:0;
  flex:1;
  color:#405d52
}
.method-note a {
  color:#155c54;
  font-size:11px;
  font-weight:790;
  white-space:nowrap;
  text-decoration:none
}
.library-grid {
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:20px
}
.library-card {
  padding:28px 32px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:14px;
  box-shadow:var(--shadow)
}
.library-card h3 {
  font-size:22px;
  margin:0 0 14px;
  letter-spacing:-.04em
}
.library-card details {
  border-top:1px solid var(--line);
  padding:12px 0
}
.library-card summary {
  font-size:14px;
  font-weight:710;
  cursor:pointer;
  padding-right:20px
}
.library-card details p {
  font-size:13px;
  color:var(--muted);
  margin:11px 0 4px
}
.units-card {
  background:#f3f7eb
}
.unit-row {
  display:flex;
  justify-content:space-between;
  gap:20px;
  border-bottom:1px solid #d8e5d2;
  padding:12px 3px;
  font-weight:760;
  color:#245552
}
.unit-row span+span {
  color:#0b716c
}
.unit-foot {
  font-size:12px;
  color:#5e7065;
  margin:19px 0
}
.text-link {
  border:0;
  background:transparent;
  color:#12665e;
  font-weight:780;
  text-decoration:underline;
  text-underline-offset:5px;
  padding:0
}
.section-study {
  background:#122e3f;
  color:#fff
}
.study-grid {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:80px;
  align-items:center
}
.study-grid h2 {
  font-size:clamp(2.2rem,4vw,4.5rem);
  letter-spacing:-.063em;
  line-height:1.1;
  margin:16px 0
}
.study-grid p {
  color:#c5d9d9;
  max-width:480px
}
.study-steps>div {
  display:grid;
  grid-template-columns:130px 1fr;
  gap:2px 10px;
  border-bottom:1px solid #45636b;
  padding:18px 0
}
.study-steps strong {
  font-size:15px
}
.study-steps small {
  grid-column:2;
  color:#acc7c5
}
.study-badge {
  align-self:center;
  width:max-content;
  padding:6px 8px;
  font-size:10px;
  font-weight:820;
  border-radius:4px
}
.study-badge.success {
  background:#c5e9ab;
  color:#214234
}
.study-badge.pending {
  background:#385660;
  color:#d8eddb
}
.journal-card {
  background:#fff;
  border:1px solid var(--line);
  border-radius:15px;
  overflow:hidden;
  box-shadow:var(--shadow)
}
.journal-top {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:15px;
  padding:20px 24px;
  border-bottom:1px solid var(--line)
}
.journal-top p {
  margin:0;
  color:#536a69;
  font-size:13px
}
.journal-actions {
  display:flex;
  flex-wrap:wrap;
  gap:8px
}
.table-scroll {
  overflow-x:auto
}
.journal-card table {
  width:100%;
  border-collapse:collapse;
  min-width:670px;
  text-align:left
}
.journal-card th {
  background:#f2f6f2;
  font-size:11px;
  color:#42635e;
  letter-spacing:.08em;
  text-transform:uppercase
}
.journal-card th,.journal-card td {
  padding:15px 19px;
  border-bottom:1px solid #ebf1ed
}
.journal-card td {
  font-size:13px
}
.journal-card tbody tr:last-child td {
  border-bottom:0
}
.journal-card td button {
  border:0;
  background:none;
  color:#0d726e;
  text-decoration:underline;
  font-weight:690;
  padding:3px
}
.site-footer {
  background:#112b3a;
  color:#e3eee7;
  padding:61px 0 0
}
.footer-grid {
  display:grid;
  grid-template-columns:1.45fr 1fr .6fr;
  gap:54px
}
.footer-logo {
  font-size:25px;
  font-weight:830;
  letter-spacing:-.055em;
  text-decoration:none
}
.footer-grid strong {
  font-size:13px
}
.footer-grid p,.footer-grid a:not(.footer-logo) {
  display:block;
  color:#b7cbcb;
  font-size:12px;
  line-height:1.8;
  margin:9px 0;
  text-decoration:none
}
.footer-bottom {
  border-top:1px solid #37535d;
  margin-top:45px;
  padding:22px 0;
  display:flex;
  justify-content:space-between;
  gap:12px;
  color:#a3c1bc;
  font-size:11px
}
.access-panel {
  position:fixed;
  right:20px;
  top:92px;
  width:min(340px,calc(100vw - 24px));
  z-index:110;
  background:#fff;
  color:#193d43;
  border:1px solid #bacfc4;
  box-shadow:0 25px 60px #0d2f3359;
  border-radius:14px;
  padding:21px
}
.access-panel[hidden],.assistant-panel[hidden],.mobile-menu[hidden] {
  display:none
}
.access-panel h2 {
  font-size:17px;
  letter-spacing:-.03em;
  margin:0 30px 15px 0
}
.access-close {
  position:absolute;
  right:13px;
  top:9px;
  border:0;
  background:none;
  font-size:28px;
  color:#476162
}
.access-panel label {
  font-size:12px;
  font-weight:720;
  display:block;
  margin-top:12px
}
.access-panel select {
  display:block;
  width:100%;
  margin-top:6px;
  border:1px solid #bacfc4;
  border-radius:8px;
  padding:9px;
  font-size:12px;
  background:#fff;
  color:#193d43
}
.access-panel .toggle-line {
  display:flex;
  justify-content:space-between;
  align-items:center
}
.access-panel .toggle-line input {
  width:20px;
  height:20px;
  accent-color:#1c7773
}
.access-panel .button {
  margin-top:17px
}
.access-panel p {
  font-size:11px;
  color:#536b68;
  margin-bottom:0
}
.assistant {
  position:fixed;
  z-index:100;
  right:22px;
  bottom:21px
}
.assistant-trigger {
  display:flex;
  align-items:center;
  gap:12px;
  border:2px solid #c3e3bd;
  border-radius:50px;
  background:#123b46;
  color:#fff;
  box-shadow:0 18px 46px #0d34376b;
  padding:9px 16px 9px 8px
}
.assistant-trigger:hover {
  background:#205860
}
.assistant-face {
  width:45px;
  height:45px;
  background:#c4eba8;
  border-radius:50%;
  display:grid;
  place-items:center;
  flex:none
}
.assistant-face svg {
  width:35px;
  stroke:#1b4745;
  stroke-width:3;
  stroke-linecap:round
}
.assistant-face svg rect {
  fill:#e6f8d6
}
.assistant-face svg circle {
  fill:#164a47;
  stroke:none
}
.assistant-trigger strong {
  font-size:12px;
  display:block;
  white-space:nowrap
}
.assistant-trigger small {
  color:#bad9c9;
  font-size:10px;
  display:block;
  text-align:left
}
.trigger-indicator {
  width:7px;
  height:7px;
  border-radius:50%;
  background:#c4eba8
}
.assistant-panel {
  width:min(386px,calc(100vw - 24px));
  height:min(572px,calc(100vh - 120px));
  height:min(572px,calc(100dvh - 120px));
  background:#fff;
  display:flex;
  flex-direction:column;
  border:1px solid #b8d0c0;
  box-shadow:0 20px 75px #08242b67;
  border-radius:16px;
  margin-bottom:12px;
  overflow:hidden
}
.assistant-header {
  display:flex;
  align-items:center;
  gap:10px;
  padding:15px;
  background:#153b45;
  color:#fff
}
.assistant-head-avatar {
  display:grid;
  place-items:center;
  width:37px;
  height:37px;
  border-radius:10px;
  background:#c4eba8;
  color:#174741
}
.assistant-header strong {
  display:block;
  font-size:13px
}
.assistant-header small {
  display:block;
  font-size:10px;
  color:#b6d1ca
}
.assistant-header button {
  margin-left:auto;
  border:0;
  background:none;
  font-size:26px;
  color:#fff
}
.chat-messages {
  flex:1;
  min-height:0;
  overflow:auto;
  padding:17px 13px;
  background:#f7f9f4;
  display:flex;
  flex-direction:column;
  gap:12px
}
.chat-bubble {
  max-width:92%;
  padding:11px 13px;
  border-radius:13px;
  font-size:12px;
  line-height:1.7;
  white-space:pre-wrap;
  overflow-wrap:anywhere
}
.chat-bubble.bot {
  align-self:flex-start;
  background:#e8f2e5;
  color:#254e4a;
  border-top-left-radius:3px
}
.chat-bubble.user {
  align-self:flex-end;
  background:#145c61;
  color:#fff;
  border-top-right-radius:3px
}
.chat-bubble .listen-btn {
  display:block;
  margin-top:7px;
  border:0;
  padding:4px 0;
  background:none;
  color:#116c68;
  font-size:11px;
  text-decoration:underline;
  font-weight:760
}
.chat-quick {
  display:flex;
  gap:7px;
  overflow-x:auto;
  padding:10px 12px;
  border-top:1px solid #e3ede6
}
.chat-quick button {
  flex:none;
  border:1px solid #b5d8bc;
  background:#f0f7ee;
  color:#28635b;
  border-radius:100px;
  padding:6px 9px;
  font-size:10px
}
.assistant-panel form {
  display:flex;
  align-items:center;
  gap:8px;
  margin:0 12px
}
.assistant-panel textarea {
  border:1px solid #afcfc0;
  border-radius:11px;
  padding:10px;
  resize:none;
  width:100%;
  font-size:12px;
  max-height:100px;
  min-height:42px
}
.assistant-panel form button {
  flex:none;
  width:37px;
  height:37px;
  border:0;
  border-radius:10px;
  background:#136c66;
  color:#fff
}
.chat-foot {
  font-size:10px;
  color:#65786c;
  margin:7px 12px 12px;
  line-height:1.3
}
body.high-contrast {
  --cream:#000;
  --white:#000;
  --ink:#fff;
  --muted:#fff;
  --line:#fff;
  --lime:#ffdd55;
  --dark-teal:#ffdd55;
  --ring:#ff9c30;
  background:#000;
  color:#fff
}
body.high-contrast .hero,body.high-contrast .site-header,body.high-contrast .site-footer,body.high-contrast .section-study,body.high-contrast .lab-sidebar {
  background:#000
}
body.high-contrast .trust>div,body.high-contrast .experiment-panel,body.high-contrast .exp-header,body.high-contrast .section-method,body.high-contrast .method-card,body.high-contrast .library-card,body.high-contrast .journal-card,body.high-contrast .access-panel,body.high-contrast .result-box,body.high-contrast .info-callout,body.high-contrast .topic-visual,body.high-contrast .formula-block,body.high-contrast .input-with-unit,body.high-contrast .input-with-unit input,body.high-contrast .input-with-unit select {
  background:#000;
  color:#fff;
  border-color:#fff
}
body.high-contrast .hero-copy>p,body.high-contrast .exp-header p,body.high-contrast .section-heading p,body.high-contrast .exp-content p,body.high-contrast .method-card p,body.high-contrast .library-card details p,body.high-contrast .unit-foot,body.high-contrast .journal-top p,body.high-contrast .study-grid p,body.high-contrast .result-box p,body.high-contrast .access-panel p,body.high-contrast .trust small {
  color:#fff
}
body.high-contrast .button-primary,body.high-contrast .lab-choice[aria-current=true] {
  background:#ffdd55;
  color:#000
}
body.high-contrast .mode-switch {
  background:#111
}
body.high-contrast .mode-switch button[aria-pressed=true] {
  background:#ffdd55;
  color:#000
}
body.large-text {
  font-size:19px
}
body.large-text .exp-content p,body.large-text .exp-header p,body.large-text .section-heading p {
  font-size:1rem
}
body.large-text .measure-field label,body.large-text .exp-tab,body.large-text .library-card summary,body.large-text .method-card p {
  font-size:.92rem
}
@media(max-width:1080px) {
  .primary-nav {
    gap:14px
  }
  .primary-nav a {
    font-size:11px
  }
  .header-voice span {
    display:none
  }
  .method-grid {
    grid-template-columns:repeat(2,1fr)
  }
  .trust {
    grid-template-columns:repeat(2,1fr)
  }
  .study-grid {
    gap:35px
  }
}
@media(max-width:820px) {
  .primary-nav {
    display:none
  }
  .menu-button {
    display:block;
    border:1px solid #55737c;
    background:#204b53;
    border-radius:8px;
    color:#fff;
    padding:5px 12px;
    font-size:21px
  }
  .mobile-menu:not([hidden]) {
    display:grid;
    gap:0;
    padding:0 26px 14px;
    background:#112c3b
  }
  .mobile-menu a {
    display:block;
    border-top:1px solid #3c5c63;
    padding:12px;
    color:#fff;
    text-decoration:none;
    font-size:13px
  }
  .hero-grid {
    grid-template-columns:1fr;
    min-height:480px
  }
  .hero-copy {
    padding:75px 0
  }
  .hero-art {
    position:absolute;
    right:-110px;
    top:20px;
    opacity:.27;
    pointer-events:none
  }
  .hero-copy>p {
    position:relative
  }
  .lab-layout {
    grid-template-columns:1fr
  }
  .lab-sidebar {
    position:static
  }
  .lab-sidebar #experiment-nav {
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:2px 8px
  }
  .study-grid {
    grid-template-columns:1fr
  }
  .study-steps {
    max-width:680px
  }
  .footer-grid {
    gap:25px
  }
}
@media(max-width:610px) {
  .container {
    width:min(100% - 30px,1240px)
  }
  .header-inner {
    height:70px
  }
  .logo {
    font-size:20px
  }
  .logo-mark {
    width:36px;
    height:36px
  }
  .logo small {
    font-size:8px
  }
  .header-voice {
    padding:8px 11px
  }
  .hero-grid {
    min-height:420px
  }
  .hero-copy {
    padding:56px 0
  }
  .hero h1 {
    font-size:clamp(3.25rem,12vw,4.5rem)
  }
  .hero-copy>p {
    font-size:15px
  }
  .hero-foot {
    gap:14px;
    margin-top:39px
  }
  .hero-foot span+span {
    padding-left:14px
  }
  .hero-foot b {
    font-size:21px
  }
  .hero-art {
    right:-180px
  }
  .trust {
    grid-template-columns:1fr 1fr;
    gap:8px;
    padding-top:13px
  }
  .trust>div {
    display:block;
    padding:10px
  }
  .feature-icon {
    width:32px;
    height:32px;
    font-size:18px;
    margin-bottom:7px
  }
  .trust strong {
    display:block
  }
  .trust small {
    display:block;
    margin:4px 0 0;
    font-size:10px
  }
  .section {
    padding:65px 0
  }
  .section-lab {
    padding-top:68px
  }
  .section-heading {
    margin-bottom:25px
  }
  .section-heading h2 {
    font-size:2.45rem
  }
  .number-mark {
    display:none
  }
  .lab-sidebar {
    padding:17px
  }
  .lab-sidebar #experiment-nav {
    grid-template-columns:1fr 1fr;
    gap:4px
  }
  .lab-choice {
    margin:0;
    padding:10px 6px;
    gap:6px
  }
  .choice-num {
    min-width:19px
  }
  .lab-choice strong {
    font-size:11px
  }
  .lab-choice small {
    font-size:9px
  }
  .exp-header {
    padding:23px 19px
  }
  .exp-tabs {
    padding:6px 17px 0
  }
  .exp-content {
    padding:23px 18px
  }
  .field-grid,.topic-grid,.library-grid {
    grid-template-columns:1fr
  }
  .formula-block strong {
    font-size:23px
  }
  .method-grid {
    grid-template-columns:1fr 1fr;
    gap:9px
  }
  .method-card {
    padding:17px;
    min-height:0
  }
  .method-card h3 {
    font-size:15px
  }
  .method-icon {
    margin:15px 0 7px
  }
  .method-note {
    display:block
  }
  .method-note p {
    margin:10px 0
  }
  .library-card {
    padding:20px
  }
  .study-steps>div {
    grid-template-columns:100px 1fr
  }
  .study-steps strong {
    font-size:13px
  }
  .journal-top {
    align-items:stretch;
    flex-direction:column;
    padding:15px
  }
  .footer-grid {
    grid-template-columns:1fr 1fr;
    gap:25px
  }
  .footer-grid>div:first-child {
    grid-column:1/-1
  }
  .footer-bottom {
    display:block
  }
  .footer-bottom span {
    display:block;
    margin-top:6px
  }
  .assistant {
    right:10px;
    bottom:10px
  }
  .assistant-trigger {
    padding-right:11px
  }
  .assistant-trigger .trigger-label {
    display:none
  }
  .assistant-trigger .trigger-indicator {
    display:none
  }
  .assistant-panel {
    height:min(590px,calc(100vh - 87px));
    height:min(590px,calc(100dvh - 87px))
  }
  .access-panel {
    top:79px;
    right:10px
  }
}
@media(max-width:390px) {
  .trust {
    grid-template-columns:1fr 1fr
  }
  .trust strong {
    font-size:11px
  }
  .lab-sidebar #experiment-nav {
    grid-template-columns:1fr
  }
  .method-grid {
    grid-template-columns:1fr
  }
  .hero-actions .button {
    width:100%
  }
}
@media(prefers-reduced-motion:reduce) {
  *,*:before,*:after {
    scroll-behavior:auto!important;
    animation-duration:.01ms!important;
    transition-duration:.01ms!important
  }
}
@media print {
  .site-header,.hero,.trust,.section-method,.section-study,.site-footer,.assistant,.access-panel,.lab-sidebar,.exp-tabs,.journal-actions,.exp-actions {
    display:none!important
  }
  .container {
    width:100%
  }
  .section {
    padding:0
  }
  .section-heading {
    margin:0 0 10px
  }
  .lab-layout {
    display:block
  }
  .experiment-panel,.journal-card {
    box-shadow:none;
    border:0
  }
  .journal-section {
    page-break-before:always
  }
  .table-scroll {
    overflow:visible
  }
  body {
    background:#fff;
    color:#000
  }
}
.exp-content fieldset {
  border:0;
  padding:0;
  margin:0
}
body.high-contrast .journal-card th {
  background:#000;
  color:#fff;
  border-color:#fff
}
body.high-contrast .quiz-option,body.high-contrast .mode-switch,body.high-contrast .result-box .result-value {
  color:#fff
}
body.high-contrast .assistant-panel,body.high-contrast .chat-messages,body.high-contrast .chat-bubble.bot,body.high-contrast .chat-quick,body.high-contrast .assistant-panel textarea,body.high-contrast .assistant-panel .chat-foot {
  background:#000;
  color:#fff;
  border-color:#fff
}
body.high-contrast .chat-bubble.bot {
  border:1px solid #fff
}
body.high-contrast .assistant-panel textarea::placeholder {
  color:#fff
}
body.high-contrast .assistant-panel .listen-btn,body.high-contrast .chat-quick button {
  color:#000;
  background:#ffdd55
}
body.large-text .assistant-panel .chat-bubble,body.large-text .assistant-panel textarea,body.large-text .assistant-panel .chat-foot {
  font-size:1rem
}