@import url("/assets/fonts.css");

:root {
  --paper: #fbf9f4;
  --paper-deep: #f0ece2;
  --ink: #1b2728;
  --muted: #596462;
  --line: #d9dcd2;
  --teal: #114854;
  --teal-dark: #0c333c;
  --accent: #803142;
  --mint: #d8e9dd;
  --display: "GFS Didot", Georgia, serif;
  --sans: Inter, system-ui, sans-serif;
  --measure: 1240px;
  color-scheme: light;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.75 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
a {
  color: inherit;
  text-underline-offset: 5px;
}
button,
input,
textarea,
select {
  font: inherit;
}
button,
a,
input,
textarea,
summary {
  -webkit-tap-highlight-color: transparent;
}
button {
  cursor: pointer;
}
h1,
h2,
h3,
p,
figure {
  margin: 0;
}
h1,
h2,
h3 {
  font-weight: 400;
}
h1,
h2 {
  font-family: var(--display);
  line-height: 1.14;
  letter-spacing: -0.035em;
}
h1 {
  font-size: clamp(43px, 5.6vw, 78px);
}
h2 {
  font-size: clamp(34px, 4vw, 52px);
}
h3 {
  font-size: 21px;
  line-height: 1.4;
}
p {
  overflow-wrap: break-word;
}
p + p {
  margin-top: 16px;
}
ul,
ol {
  padding-left: 24px;
}
li + li {
  margin-top: 8px;
}
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 5px;
}
::selection {
  background: var(--teal);
  color: white;
}
[hidden] {
  display: none !important;
}
.wrap {
  width: min(var(--measure), calc(100% - 80px));
  margin-inline: auto;
}
.eyebrow,
.section-kicker,
.form-chip {
  display: block;
  font: 600 11px/1.6 var(--sans);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 20px;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  left: 20px;
  top: 10px;
  z-index: 100;
  padding: 12px 20px;
  background: var(--paper);
  transform: translateY(-150%);
}
.skip-link:focus {
  transform: translateY(0);
}

/* A quiet, shared masthead on every public page. */
.utility-bar {
  background: var(--teal-dark);
  color: #e5eeea;
  font-size: 10px;
  letter-spacing: 0.12em;
}
.utility-bar .wrap {
  min-height: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.utility-bar a {
  text-decoration: none;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex: none;
}
.brand img {
  width: 42px;
  height: 42px;
  border-radius: 9px;
}
.brand-name {
  display: block;
  font-size: 20px;
  letter-spacing: -0.055em;
  line-height: 1.2;
}
.brand-name strong {
  font-weight: 600;
}
.brand-meta {
  display: block;
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin-top: 6px;
}
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 12px;
}
.desktop-nav a {
  text-decoration: none;
  padding-block: 10px;
}
.desktop-nav a:hover,
.desktop-nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
}
.header-cta {
  padding: 12px 20px;
  border: 1px solid var(--teal);
  background: var(--teal);
  color: white;
  font-size: 12px;
  text-decoration: none;
}
.header-cta:hover {
  background: var(--teal-dark);
}
.mobile-menu {
  display: none;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  min-height: 48px;
  padding: 12px 22px;
  border: 1px solid var(--teal);
  background: var(--teal);
  color: white;
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
  transition: background 0.15s;
}
.btn:hover {
  background: var(--teal-dark);
}
.btn.secondary {
  background: transparent;
  color: var(--teal);
}
.btn.secondary:hover {
  background: var(--paper-deep);
}
.text-link {
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 5px;
}
.store-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.store-links a {
  display: block;
  border-radius: 7px;
}
.store-links img {
  height: 46px;
  width: auto;
}
.store-note {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.7;
  margin-top: 14px;
}

/* Product comes first: real screens and a clear route to the stores. */
.product-hero {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 66px;
  align-items: center;
  padding-block: 76px 64px;
}
.hero-copy h1 {
  max-width: 650px;
}
.hero-copy h1 em {
  font-style: normal;
  color: var(--teal);
}
.hero-copy .lead {
  max-width: 520px;
  font-size: 16px;
  color: var(--muted);
  line-height: 1.9;
  margin: 26px 0;
}
.hero-copy .text-link {
  display: inline-block;
  margin-top: 26px;
}
.hero-art {
  position: relative;
  min-height: 540px;
  background: #e7ece3;
  border-radius: 48% 48% 6px 6px;
  padding: 30px 24px 36px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 18px;
}
.hero-art:before {
  content: "";
  position: absolute;
  inset: 20px;
  border: 1px solid #bbc8ba;
  border-radius: 48% 48% 3px 3px;
  pointer-events: none;
}
.hero-art .phone {
  width: 43%;
  position: relative;
  transform: rotate(-5deg) translateY(-15px);
}
.hero-art .phone + .phone {
  transform: rotate(5deg) translateY(22px);
}
.phone {
  display: block;
  padding: 6px;
  border-radius: 27px;
  background: #102e37;
  border: 1px solid #42636a;
  box-shadow: 0 18px 30px #0d333c24;
  overflow: hidden;
}
.phone img {
  width: 100%;
  height: auto;
  border-radius: 21px;
}
.hero-art figcaption {
  position: absolute;
  bottom: 16px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 9px;
  letter-spacing: 0.08em;
  color: #3f5754;
}
.hero-seal {
  position: absolute;
  bottom: 94px;
  left: -28px;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 17px 22px;
  box-shadow: 0 8px 24px #0e383c10;
  font-size: 11px;
  line-height: 1.6;
}
.hero-seal strong {
  display: block;
  color: var(--teal);
  font-size: 14px;
}
.proof-strip {
  border-block: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  padding-block: 23px;
  margin-bottom: 16px;
}
.proof-strip div {
  padding-inline: 28px;
  border-right: 1px solid var(--line);
  font-size: 11px;
  color: var(--muted);
}
.proof-strip div:first-child {
  padding-left: 0;
}
.proof-strip div:last-child {
  border: 0;
}
.proof-strip strong {
  display: block;
  font-weight: 600;
  font-size: 13px;
  color: var(--ink);
  margin-bottom: 3px;
}
.page-section {
  padding-block: 86px;
}
.section-heading {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 70px;
  align-items: end;
  margin-bottom: 38px;
}
.section-heading .eyebrow {
  margin-bottom: 14px;
}
.section-heading > p,
.section-intro {
  font-size: 14px;
  color: var(--muted);
  max-width: 530px;
}
.section-heading h2 {
  max-width: 650px;
}
.intent-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.intent-card {
  position: relative;
  min-height: 242px;
  padding: 28px 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: background 0.18s;
}
.intent-card:hover {
  background: var(--paper-deep);
}
.intent-card .index {
  display: block;
  color: var(--muted);
  font-size: 11px;
  margin-bottom: 28px;
}
.intent-card strong {
  display: block;
  font-family: var(--display);
  font-weight: 400;
  font-size: 29px;
  margin-bottom: 10px;
  color: var(--card-accent, var(--teal));
}
.intent-card > span:last-of-type {
  display: block;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.8;
  padding-bottom: 24px;
}
.intent-card .arrow {
  position: absolute;
  top: 27px;
  right: 24px;
  color: var(--card-accent, var(--teal));
  font-size: 20px;
}
.intent-card:nth-child(1) {
  --card-accent: #803142;
}
.intent-card:nth-child(2) {
  --card-accent: #745318;
}
.intent-card:nth-child(3) {
  --card-accent: #405d46;
}
.intent-card:nth-child(4) {
  --card-accent: #304a72;
}

/* Native radio controls keep both platform galleries usable without JavaScript. */
.showcase {
  background: var(--teal-dark);
  color: var(--paper);
}
.showcase .eyebrow {
  color: #c1d7cb;
}
.showcase .section-heading > p {
  color: #c1d2d1;
}
.platform-picker {
  border: 0;
  padding: 0;
  margin: 0;
  min-width: 0;
}
.platform-picker legend {
  font-size: 11px;
  color: #c1d2d1;
  margin-bottom: 14px;
}
.platform-radio {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}
.platform-picker > label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  border: 1px solid #789397;
  padding: 10px 23px;
  font-size: 12px;
  margin-right: 8px;
  min-height: 44px;
}
.platform-picker > label small {
  font-size: 9px;
  opacity: 0.7;
}
.platform-radio:focus-visible + label {
  outline: 3px solid #d3e4ce;
  outline-offset: 4px;
}
#platform-ios:checked + label,
#platform-android:checked + label {
  background: #e1ecd9;
  color: var(--teal-dark);
  border-color: #e1ecd9;
}
.platform-panels {
  margin-top: 38px;
}
#platform-ios:checked ~ .platform-panels .gallery-android,
#platform-android:checked ~ .platform-panels .gallery-ios {
  display: none;
}
.screen-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 64px;
}
.screen-gallery figure {
  min-width: 0;
}
.screen-gallery .phone {
  max-width: 248px;
  margin: auto;
  transition: transform 0.2s;
}
.screen-gallery .phone:hover {
  transform: translateY(-5px);
}
.screen-gallery figcaption {
  margin-top: 24px;
  border-top: 1px solid #59777a;
  padding-top: 20px;
}
.screen-gallery figcaption > span {
  font-size: 10px;
  color: #bdd4c7;
}
.screen-gallery h3 {
  font-size: 15px;
  margin-block: 8px;
}
.screen-gallery p {
  font-size: 12px;
  color: #c1d2d1;
}
.gallery-footnote {
  border-top: 1px solid #59777a;
  margin-top: 36px;
  padding-top: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-size: 10px;
  color: #c1d2d1;
}
.gallery-footnote a {
  flex-shrink: 0;
}
.screen-lightbox {
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--paper);
  width: min(540px, 94vw);
  max-height: 94dvh;
  overflow: auto;
}
.screen-lightbox::backdrop {
  background: #061d24d9;
}
.lightbox-toolbar {
  position: sticky;
  top: -18px;
  background: var(--paper);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding-block: 8px 16px;
}
.lightbox-toolbar h2 {
  font: 600 13px/1.5 var(--sans);
  letter-spacing: 0;
}
.lightbox-toolbar button {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: 26px;
}
.screen-lightbox img {
  width: auto;
  max-height: calc(94dvh - 120px);
  margin: auto;
}

/* A worked learning example, explicitly separate from the app screenshots. */
.method-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 72px;
  align-items: start;
}
.method-copy h2 {
  margin-bottom: 24px;
}
.method-copy p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 24px;
}
.method-copy .method-quote {
  font-family: var(--display);
  font-size: 28px;
  color: var(--teal);
  line-height: 1.4;
  margin-block: 30px;
}
.method-example {
  min-width: 0;
  background: var(--paper-deep);
  border: 1px solid var(--line);
  padding: 30px;
}
.example-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 18px;
}
.example-title {
  font-family: var(--display);
  font-size: 30px;
  line-height: 1.4;
}
.math-display {
  max-width: 100%;
  overflow-x: auto;
  padding: 12px 2px;
  margin-block: 8px;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.6;
}
.math-display math {
  width: max-content;
  margin-inline: 0;
  text-align: left;
}
.method-example > .math-display {
  font-size: 25px;
}
.example-domain {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 18px;
}
.example-questions,
.example-panel ul {
  padding-left: 22px;
  color: #465651;
  font-size: 14px;
  line-height: 1.9;
}
.example-questions li,
.example-panel li {
  padding-left: 3px;
  margin-block: 8px;
}
.example-questions sub {
  white-space: nowrap;
}
.example-tabs {
  display: flex;
  gap: 8px;
  margin-block: 26px;
  flex-wrap: wrap;
}
.example-tabs button {
  display: grid;
  place-items: center;
  min-width: 40px;
  min-height: 40px;
  border: 1px solid #9baca5;
  background: transparent;
  color: var(--teal);
  font-size: 12px;
}
.example-tabs button[aria-selected="true"] {
  background: var(--teal);
  color: white;
  border-color: var(--teal);
}
.example-panel {
  min-height: 156px;
  border-top: 1px solid #c9d0c6;
  padding-top: 22px;
}
.example-panel h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 12px;
}
.example-panel p {
  color: #465651;
  font-size: 14px;
  line-height: 1.9;
  margin-bottom: 14px;
}
.example-panel h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--teal);
  margin-block: 24px 12px;
}
.example-panel h4:first-of-type {
  margin-top: 18px;
}
.example-table-wrap {
  max-width: 100%;
  overflow-x: auto;
  margin-block: 20px;
}
.example-limits {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  text-align: left;
}
.example-limits caption {
  text-align: left;
  font-weight: 600;
  padding-bottom: 10px;
}
.example-limits th,
.example-limits td {
  border-bottom: 1px solid #c9d0c6;
  padding: 10px 8px;
}
.example-limits td {
  font-size: 18px;
}
.example-note {
  font-size: 10px;
  color: var(--muted);
  margin-top: 22px;
}
.learning-path {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.path-step {
  min-width: 0;
  overflow-wrap: anywhere;
  padding: 26px 28px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.path-step .index {
  font-size: 10px;
  color: var(--muted);
}
.path-step h3 {
  font-family: var(--display);
  font-size: 27px;
  color: var(--teal);
  margin-block: 12px;
}
.path-step p {
  font-size: 12px;
  color: var(--muted);
}
.ai-note {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 64px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  margin-top: 26px;
}
.ai-note h3 {
  font-family: var(--display);
  font-size: 28px;
  color: var(--teal);
}
.ai-note p {
  font-size: 13px;
  color: var(--muted);
}
.courses {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.course-group {
  padding: 28px;
  border: 1px solid var(--line);
}
.course-group h3 {
  font-family: var(--display);
  font-size: 28px;
  color: var(--teal);
}
.course-group h3 span {
  font: 400 11px var(--sans);
  display: block;
  margin-top: 10px;
}
.course-group ul {
  font-size: 13px;
  color: var(--muted);
}
.course-group p {
  font-size: 13px;
  color: var(--muted);
  margin-block: 16px;
}
.course-group h4 {
  font-size: 13px;
  margin: 20px 0 8px;
}
.soft-band {
  background: var(--paper-deep);
}
.faq-layout {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 72px;
}
.faq-layout h2 {
  margin-bottom: 24px;
}
.faq details {
  border-top: 1px solid var(--line);
}
.faq details:last-child {
  border-bottom: 1px solid var(--line);
}
.faq summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  min-height: 65px;
  padding: 18px 0;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  list-style: none;
  line-height: 1.7;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary:after {
  content: "+";
  font-weight: 400;
  font-size: 22px;
  color: var(--teal);
}
.faq details[open] summary:after {
  content: "−";
}
.faq details p {
  font-size: 13px;
  line-height: 1.9;
  color: var(--muted);
  padding: 0 36px 24px 0;
}

.download-band {
  padding-block: 54px;
  background: var(--teal);
  color: var(--paper);
}
.download-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}
.download-inner h2 {
  font-size: 40px;
  margin-bottom: 12px;
}
.download-inner p {
  font-size: 12px;
  color: #ceded9;
}
.download-inner .store-note {
  color: #ceded9;
}
.opportunities {
  padding-block: 80px;
}
.opportunities > p {
  max-width: 700px;
  font-size: 14px;
  color: var(--muted);
  margin-block: 20px 32px;
}
.forms-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.form-card {
  padding: 30px;
  border: 1px solid var(--line);
  background: var(--paper);
}
.form-card h3 {
  font-family: var(--display);
  font-size: 28px;
  margin-bottom: 18px;
}
.form-copy {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 24px;
}
.lead-form,
.field-grid {
  display: grid;
  gap: 16px;
}
.field-grid.two-up {
  grid-template-columns: 1fr 1fr;
}
.field {
  display: grid;
  gap: 8px;
  min-width: 0;
}
.field span,
.form-group label {
  font-size: 11px;
  font-weight: 600;
}
.field input,
.field textarea,
.feedback-section input,
.feedback-section textarea,
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  min-width: 0;
  border: 1px solid #a4b3ac;
  background: #fdfcf8;
  border-radius: 0;
  padding: 12px;
  color: var(--ink);
  font-size: 13px;
}
.field textarea {
  min-height: 115px;
  resize: vertical;
}
.submit-btn,
.fb-submit,
.btn-submit {
  min-height: 48px;
  padding: 12px 18px;
  border: 0;
  background: var(--teal);
  color: white;
  font-size: 13px;
  font-weight: 600;
}
.submit-btn:hover,
.fb-submit:hover,
.btn-submit:hover {
  background: var(--teal-dark);
}
.form-note {
  font-size: 10px;
  color: var(--muted);
  line-height: 1.8;
}
.muted-link {
  color: inherit;
}
.feedback-section {
  padding-block: 60px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
}
.feedback-section h2 {
  font-size: 36px;
  margin-bottom: 18px;
}
.fb-text {
  color: var(--muted);
  font-size: 13px;
}
.fb-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}
.feedback-section textarea {
  min-height: 110px;
  resize: vertical;
}
.fb-submit {
  width: 100%;
  margin-top: 12px;
}
.fb-email {
  display: inline-block;
  font-size: 12px;
  margin-top: 20px;
}
.fb-success,
.form-success {
  display: none;
  color: var(--teal);
  padding: 16px;
  border: 1px solid var(--line);
  font-size: 13px;
}
.site-footer {
  padding-block: 48px 24px;
  border-top: 1px solid var(--line);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 0.8fr;
  gap: 60px;
}
.footer-grid p {
  max-width: 360px;
  font-size: 12px;
  color: var(--muted);
  margin-top: 18px;
}
.footer-title {
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 20px;
}
.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 12px;
}
.footer-nav a {
  text-decoration: none;
}
.footer-nav a:hover {
  text-decoration: underline;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 10px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  margin-top: 36px;
  padding-top: 20px;
}
.footer-bottom nav {
  display: flex;
  gap: 20px;
}
.mobile-download {
  display: none;
}

/* The same typography and chrome on audience, method and support pages. */
.interior .shell {
  width: min(1080px, calc(100% - 80px));
  margin: 0 auto;
  padding-block: 52px 64px;
}
.interior .hero {
  padding-block: 32px 54px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 36px;
}
.interior .hero h1 {
  font-size: clamp(40px, 5vw, 65px);
  max-width: 900px;
}
.interior .hero p {
  color: var(--muted);
  max-width: 790px;
  font-size: 15px;
  margin-top: 24px;
}
.interior .cta-row,
.interior .links,
.interior .hub-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 26px;
}
.interior .trust-line {
  font-size: 12px !important;
  line-height: 1.9;
}
.interior .section {
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}
.interior .section h2,
.interior .card h2 {
  font-size: 34px;
  margin-bottom: 20px;
}
.interior .section h3,
.interior .card h3 {
  font-family: var(--display);
  font-size: 28px;
  margin-bottom: 16px;
}
.interior .section p,
.interior .section li,
.interior .card p,
.interior .card li {
  font-size: 14px;
  color: var(--muted);
}
.interior .grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 24px;
}
.interior .grid.two,
.interior[data-page="support"] .grid,
.interior[data-page="method"] .grid {
  grid-template-columns: 1fr 1fr;
}
.interior .grid .card {
  padding: 25px;
  border: 1px solid var(--line);
}
.interior .stack {
  display: grid;
  gap: 30px;
}
.interior .stack > .card {
  padding: 30px;
  border: 1px solid var(--line);
}
.interior .note {
  padding: 18px;
  border-left: 2px solid var(--teal);
  background: var(--paper-deep);
  font-size: 12px;
  color: var(--muted);
  margin-top: 24px;
}
.interior .hub-links a {
  font-size: 12px;
}
.interior .footer {
  padding-top: 20px;
  font-size: 12px;
  color: var(--muted);
}
.interior .sections {
  width: min(900px, calc(100% - 80px));
  margin: auto;
}
.interior .section-card {
  padding: 30px;
  border: 1px solid var(--line);
  margin-bottom: 24px;
}
.interior .section-card h2 {
  font-size: 32px;
  margin-bottom: 20px;
}
.interior .section-card p {
  font-size: 13px;
  color: var(--muted);
}
.interior .appstore-mini {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block: 24px;
}
.interior .appstore-mini img {
  height: 46px;
  width: auto;
}
.interior[data-page="android"] > main.hero {
  width: min(900px, calc(100% - 80px));
  margin-inline: auto;
  padding-top: 70px;
}
.interior .form-group {
  margin-bottom: 16px;
}
.interior .form-group label {
  display: block;
  margin-bottom: 8px;
}
.interior .btn-submit {
  width: 100%;
}
.interior .feedback-email,
.interior .back-link {
  font-size: 12px;
  display: inline-block;
  margin-top: 24px;
}
.thanks-page > main,
.error-page > main {
  width: min(700px, calc(100% - 48px));
  margin: 72px auto;
  padding: 50px 0;
  min-height: 48vh;
}
.thanks-page h1,
.error-page h1 {
  font-size: 48px;
  margin-bottom: 24px;
}
.thanks-page .msg,
.error-page p {
  color: var(--muted);
  margin-bottom: 24px;
}
.thanks-page .check {
  margin-bottom: 24px;
}
.thanks-page .check svg {
  height: 42px;
  width: 42px;
  stroke: var(--teal);
}
.error-page main nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
}

@media (min-width: 1500px) {
  .product-hero {
    padding-block: 90px 80px;
  }
  .hero-art {
    min-height: 580px;
  }
}
@media (max-width: 1100px) {
  .desktop-nav {
    gap: 18px;
  }
  .product-hero {
    gap: 36px;
  }
  .hero-art {
    min-height: 470px;
  }
  .hero-seal {
    left: -12px;
    bottom: 64px;
  }
  .screen-gallery {
    gap: 40px;
  }
  .method-layout,
  .faq-layout {
    gap: 40px;
  }
  .intent-card {
    padding: 24px 18px;
  }
  .intent-card strong {
    font-size: 25px;
  }
  .intent-card .arrow {
    right: 18px;
  }
}
@media (max-width: 900px) {
  .wrap {
    width: calc(100% - 48px);
  }
  .desktop-nav {
    display: none;
  }
  .mobile-menu {
    display: block;
  }
  .header-cta {
    margin-left: auto;
  }
  .mobile-menu summary {
    list-style: none;
    cursor: pointer;
    min-width: 44px;
    min-height: 44px;
    display: grid;
    place-items: center;
    font-size: 12px;
    border: 1px solid var(--line);
  }
  .mobile-menu summary::-webkit-details-marker {
    display: none;
  }
  .mobile-menu[open] summary {
    background: var(--teal);
    color: white;
  }
  .mobile-menu nav {
    max-height: calc(100dvh - 170px);
    overflow-y: auto;
    overscroll-behavior: contain;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 24px;
    box-shadow: 0 18px 24px #0a333c15;
    display: flex;
    flex-direction: column;
    gap: 0;
  }
  .mobile-menu nav a {
    font-size: 14px;
    padding: 12px 0;
    text-decoration: none;
  }
  .header-inner {
    min-height: 76px;
    gap: 16px;
  }
  .product-hero {
    padding-block: 48px;
    gap: 30px;
  }
  .hero-art {
    min-height: 430px;
    padding-inline: 15px;
  }
  .hero-art .phone {
    width: 46%;
  }
  .hero-copy h1 {
    font-size: clamp(42px, 6vw, 60px);
  }
  .hero-copy .lead {
    font-size: 14px;
  }
  .store-links img {
    height: 40px;
  }
  .hero-seal {
    bottom: 45px;
    padding: 12px 16px;
    font-size: 10px;
  }
  .hero-seal strong {
    font-size: 12px;
  }
  .intent-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .intent-card {
    min-height: 215px;
  }
  .section-heading {
    gap: 40px;
  }
  .screen-gallery {
    gap: 28px;
  }
  .page-section {
    padding-block: 64px;
  }
  .method-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .method-copy {
    max-width: 700px;
  }
  .method-copy .method-quote {
    margin-block: 20px;
  }
  .method-example {
    max-width: 760px;
  }
  .download-inner {
    align-items: start;
    flex-direction: column;
    gap: 26px;
  }
  .feedback-section {
    gap: 35px;
  }
  .footer-grid {
    gap: 30px;
  }
  .interior .shell {
    width: calc(100% - 48px);
  }
  .interior .grid {
    grid-template-columns: 1fr;
  }
  .interior .sections,
  .interior[data-page="android"] > main.hero {
    width: calc(100% - 48px);
  }
}
@media (max-width: 640px) {
  html {
    scroll-padding-top: 90px;
  }
  .wrap {
    width: calc(100% - 40px);
  }
  body {
    font-size: 14px;
  }
  .utility-bar .wrap {
    min-height: 28px;
    font-size: 8px;
    letter-spacing: 0.06em;
  }
  .utility-bar .utility-link {
    display: none;
  }
  .header-inner {
    min-height: 72px;
    gap: 12px;
  }
  .brand {
    gap: 8px;
  }
  .brand img {
    width: 34px;
    height: 34px;
  }
  .brand-name {
    font-size: 18px;
  }
  .brand-meta {
    font-size: 8px;
    letter-spacing: 0.1em;
  }
  .header-cta {
    font-size: 10px;
    padding: 10px 12px;
    line-height: 1.5;
  }
  .mobile-menu summary {
    font-size: 0;
    width: 38px;
    min-width: 38px;
  }
  .mobile-menu summary:after {
    content: "☰";
    font-size: 20px;
  }
  .mobile-menu[open] summary:after {
    content: "×";
    font-size: 26px;
  }
  .product-hero {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-block: 38px 32px;
  }
  .hero-copy h1 {
    font-size: clamp(42px, 9.5vw, 60px);
  }
  .hero-copy .lead {
    max-width: 480px;
    margin-block: 22px;
    font-size: 14px;
  }
  .eyebrow {
    font-size: 9px;
    margin-bottom: 18px;
  }
  .hero-copy .text-link {
    margin-top: 20px;
  }
  .hero-art {
    min-height: 0;
    max-width: 440px;
    width: 100%;
    margin: auto;
    padding: 30px 26px 48px;
    gap: 16px;
  }
  .hero-art .phone {
    width: 43%;
    max-width: 174px;
    border-radius: 23px;
    padding: 4px;
  }
  .hero-art .phone img {
    border-radius: 18px;
  }
  .hero-seal {
    bottom: 40px;
    left: 0;
  }
  .hero-art figcaption {
    font-size: 8px;
    bottom: 13px;
  }
  .proof-strip {
    grid-template-columns: 1fr;
    padding-block: 0;
  }
  .proof-strip div,
  .proof-strip div:first-child {
    padding: 14px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    font-size: 10px;
  }
  .proof-strip strong {
    font-size: 12px;
    display: inline;
    margin-right: 12px;
  }
  .proof-strip div:last-child {
    border: 0;
  }
  .section-heading {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-bottom: 28px;
  }
  .section-heading > p {
    font-size: 13px;
  }
  .page-section {
    padding-block: 48px;
  }
  h2 {
    font-size: 35px;
  }
  .intent-card {
    padding: 20px 16px;
    min-height: 225px;
  }
  .intent-card strong {
    font-size: 25px;
    line-height: 1.3;
  }
  .intent-card .index {
    margin-bottom: 24px;
    font-size: 9px;
  }
  .intent-card > span:last-of-type {
    font-size: 11px;
  }
  .intent-card .arrow {
    top: 18px;
    right: 16px;
  }
  .screen-gallery {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-padding-left: 4px;
    gap: 24px;
    padding: 6px 4px 20px;
    scrollbar-color: #bdd4c7 var(--teal);
  }
  .screen-gallery figure {
    flex: 0 0 min(248px, 76vw);
    scroll-snap-align: start;
  }
  .screen-gallery .phone {
    width: 100%;
    max-width: 220px;
  }
  .platform-picker > label {
    padding: 10px 17px;
    font-size: 11px;
  }
  .platform-panels {
    margin-top: 26px;
  }
  .gallery-footnote {
    align-items: start;
    flex-direction: column;
    gap: 14px;
    margin-top: 20px;
  }
  .method-copy h2 {
    margin-bottom: 20px;
  }
  .method-copy p {
    font-size: 13px;
  }
  .method-example {
    padding: 22px 18px;
  }
  .example-tabs {
    gap: 7px;
  }
  .example-tabs button {
    min-width: 36px;
    min-height: 40px;
  }
  .example-heading {
    font-size: 9px;
  }
  .example-panel {
    min-height: 190px;
  }
  .example-panel p,
  .example-questions,
  .example-panel ul {
    font-size: 13px;
  }
  .example-title {
    font-size: 27px;
  }
  .math-display {
    font-size: 16px;
  }
  .method-example > .math-display {
    font-size: 23px;
  }
  .example-limits {
    font-size: 11px;
  }
  .learning-path {
    grid-template-columns: minmax(0, 1fr);
  }
  .path-step {
    padding: 22px 18px;
  }
  .path-step h3 {
    font-size: 25px;
  }
  .path-step p {
    font-size: 11px;
  }
  .ai-note {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .courses {
    grid-template-columns: 1fr;
  }
  .course-group {
    padding: 24px;
  }
  .faq-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .faq summary {
    font-size: 12px;
  }
  .faq details p {
    font-size: 12px;
  }
  .download-inner h2 {
    font-size: 34px;
  }
  .opportunities {
    padding-block: 48px;
  }
  .forms-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .form-card {
    padding: 24px 20px;
  }
  .field-grid.two-up {
    grid-template-columns: 1fr;
  }
  .feedback-section {
    padding-block: 48px;
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .fb-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
  .footer-grid > div:first-child {
    grid-column: 1/-1;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
  }
  .site-footer {
    padding-bottom: 100px;
  }
  .mobile-download {
    display: flex;
    position: fixed;
    z-index: 25;
    bottom: 0;
    left: 0;
    right: 0;
    justify-content: center;
    gap: 18px;
    padding: 10px 20px max(10px, env(safe-area-inset-bottom));
    border-top: 1px solid var(--line);
    background: var(--paper);
  }
  .mobile-download img {
    height: 36px;
    width: auto;
  }
  .interior .shell {
    width: calc(100% - 40px);
    padding-top: 28px;
  }
  .interior .hero {
    padding-block: 24px 36px;
  }
  .interior .hero h1 {
    font-size: 40px;
  }
  .interior .hero p {
    font-size: 13px;
  }
  .interior .grid.two,
  .interior[data-page="support"] .grid,
  .interior[data-page="method"] .grid {
    grid-template-columns: 1fr;
  }
  .interior .stack > .card {
    padding: 24px 18px;
  }
  .interior .section h2,
  .interior .card h2 {
    font-size: 30px;
  }
  .interior .section p,
  .interior .section li,
  .interior .card p,
  .interior .card li {
    font-size: 13px;
  }
  .interior .sections,
  .interior[data-page="android"] > main.hero {
    width: calc(100% - 40px);
  }
  .interior .section-card {
    padding: 24px 18px;
  }
  .thanks-page > main,
  .error-page > main {
    padding-block: 20px;
    margin-block: 40px;
  }
  .thanks-page h1,
  .error-page h1 {
    font-size: 38px;
  }
}
.hero-art {
  padding-bottom: 72px;
}
.intent-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.intent-card {
  min-width: 0;
}
@media (max-width: 900px) {
  .intent-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 640px) {
  .hero-art {
    padding-bottom: 72px;
  }
  .intent-card strong {
    font-size: 24px;
  }
}
@media (max-width: 380px) {
  .intent-grid {
    grid-template-columns: 1fr;
  }
  .intent-card {
    min-height: 180px;
  }
  .intent-card strong {
    font-size: 29px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *:before,
  *:after {
    transition: none !important;
    animation: none !important;
  }
  .screen-gallery {
    scroll-snap-type: none;
  }
}