* {
  box-sizing: border-box;
}
html {
  color-scheme: light dark;
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}
html[data-theme="light"] {
  color-scheme: light;
}
html[data-theme="dark"] {
  color-scheme: dark;
}
body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font:
    16px/1.8 -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang TC",
    sans-serif;
  -webkit-font-smoothing: antialiased;
}
h1,
h2,
h3,
p,
figure {
  margin: 0;
}
a {
  color: inherit;
  text-underline-offset: 4px;
}
button,
input,
select {
  font: inherit;
}
a,
button,
select,
input {
  touch-action: manipulation;
}
a:focus-visible,
button:focus-visible,
select:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 5px;
}
svg {
  display: block;
}
::selection {
  background: var(--accent);
  color: var(--background);
}
.shell {
  width: min(1200px, calc(100% - 96px));
  margin-inline: auto;
}
.site-header {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 106px;
  border-bottom: 1px solid var(--border);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}
.brand svg {
  width: 37px;
  height: 37px;
  color: var(--accent);
}
.brand > span {
  font-size: 28px;
  font-weight: 680;
  letter-spacing: -0.065em;
}
.endorsement {
  color: var(--muted);
  font-size: 12px;
  text-decoration: none;
  border-left: 1px solid var(--border);
  padding-left: 18px;
}
.site-header nav {
  margin-left: auto;
  display: flex;
  gap: 30px;
  align-items: center;
}
.site-header nav a {
  font-size: 14px;
  text-decoration: none;
  padding: 10px 0;
}
.site-header a[aria-current="page"] {
  color: var(--accent);
  text-decoration: underline;
}
.nav-update {
  display: flex;
  align-items: center;
  gap: 12px;
}
.eyebrow {
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}
h1 {
  font-size: clamp(44px, 5.3vw, 72px);
  line-height: 1.2;
  font-weight: 650;
  letter-spacing: -0.06em;
}
h1 em {
  font-style: normal;
  color: var(--accent);
}
h2 {
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.35;
  letter-spacing: -0.045em;
  font-weight: 600;
}
h3 {
  font-size: 23px;
  letter-spacing: -0.025em;
  line-height: 1.4;
}
.lead {
  font-size: 17px;
  line-height: 1.95;
  color: var(--muted);
  max-width: 36em;
}
.hero {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 76px 0 84px;
}
.hero h1 {
  margin: 20px 0 26px;
}
.actions {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 13px 21px;
  border: 1px solid transparent;
  border-radius: 5px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  min-height: 48px;
}
.primary {
  background: var(--accent);
  color: var(--background);
}
.primary:hover {
  filter: brightness(1.08);
}
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  text-decoration: none;
  min-height: 44px;
}
.text-link:hover {
  text-decoration: underline;
}
.availability {
  color: var(--muted);
  font-size: 12px;
  margin-top: 18px;
}
.hero-study {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 26px 28px;
  transform: rotate(-2deg);
  border-radius: 10px;
}
.study-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
}
.number-pair {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 36px 0;
  font-size: clamp(30px, 3.3vw, 48px);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.04em;
}
.number-pair > span:first-child {
  text-decoration: line-through;
  color: var(--muted);
  text-decoration-thickness: 1px;
}
.number-pair > span:nth-child(2) {
  font-size: 24px;
  color: var(--muted);
}
.number-pair strong {
  color: var(--accent);
  font-weight: 600;
}
.sample-quote {
  font-size: 20px;
  line-height: 1.6;
  font-family: Georgia, serif;
  padding-bottom: 24px;
  border-bottom: 1px dashed var(--border);
}
.study-caption {
  display: flex;
  gap: 20px;
  align-items: center;
  margin: 20px 0 12px;
}
.study-caption p {
  font-size: 14px;
}
.signal {
  display: flex;
  gap: 4px;
  align-items: center;
  height: 30px;
}
.signal i {
  width: 4px;
  height: 12px;
  background: var(--accent);
  border-radius: 2px;
}
.signal i:nth-child(2),
.signal i:nth-child(4) {
  height: 22px;
}
.signal i:nth-child(3) {
  height: 30px;
}
.sample-label,
.fine {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.8;
}
.section {
  border-top: 1px solid var(--border);
  padding: 50px 0 60px;
}
.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: end;
  margin-bottom: 30px;
}
.section-heading h2,
.section > h2 {
  margin-top: 14px;
}
.section-heading > p {
  font-size: 14px;
  color: var(--muted);
}
.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.product-card {
  padding: 30px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.product-top {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  width: 100%;
  margin-bottom: 30px;
}
.status {
  color: var(--muted);
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.status span {
  font-size: 7px;
  color: var(--accent);
}
.product-card h3 {
  font-size: 29px;
}
.product-label {
  font-size: 16px;
  margin: 5px 0 18px;
}
.product-card > p:not(.product-label) {
  color: var(--muted);
  font-size: 15px;
}
.product-card > .text-link {
  margin-top: auto;
  padding-top: 22px;
  color: var(--accent);
}
.approach {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 70px;
}
.approach h2 {
  margin-top: 16px;
}
.principles article {
  display: grid;
  grid-template-columns: 25px 1fr;
  gap: 8px 16px;
  padding: 20px 0;
}
.principles article:first-child {
  padding-top: 0;
}
.principles article + article {
  border-top: 1px solid var(--border);
}
.principles span {
  font-size: 12px;
  color: var(--accent);
  padding-top: 7px;
}
.principles h3 {
  font-size: 21px;
}
.principles p {
  grid-column: 2;
  color: var(--muted);
  font-size: 15px;
}
.updates {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  padding: 48px;
  background: var(--subtle);
  border-radius: 10px;
  margin: 8px 0 56px;
  scroll-margin-top: 24px;
}
.updates h2 {
  margin: 14px 0 20px;
}
.updates > div > p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.9;
}
.updates-panel fieldset {
  padding: 0;
  margin: 0 0 20px;
  border: 0;
}
.updates-panel legend {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 17px;
}
.check {
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  padding: 12px 0;
}
.check input {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
  flex-shrink: 0;
}
.check small {
  display: block;
  font-size: 12px;
  color: var(--muted);
}
.mail-help {
  font-size: 13px;
  color: var(--muted);
  margin: 16px 0;
}
.notification-draft[aria-disabled="true"] {
  background: var(--surface);
  color: var(--muted);
  border-color: var(--border);
  cursor: default;
}
.updates-panel .fine a {
  overflow-wrap: anywhere;
}
.faq h2 {
  margin: 12px 0 24px;
}
.faq details {
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}
summary {
  font-size: 17px;
  font-weight: 550;
  cursor: pointer;
  padding-right: 10px;
}
details p {
  margin: 15px 0 5px;
  color: var(--muted);
  font-size: 15px;
  max-width: 70ch;
}
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 22px;
}
.footer-top {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-top > p {
  font-size: 13px;
  color: var(--muted);
}
.appearance-control {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--muted);
}
select {
  background: var(--surface);
  color: var(--foreground);
  border: 1px solid var(--border);
  padding: 8px 11px;
  border-radius: 5px;
  font-size: 13px;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 25px;
  font-size: 12px;
  color: var(--muted);
}
.footer-bottom nav {
  display: flex;
  gap: 24px;
}
.footer-bottom a {
  padding-block: 10px;
  text-decoration: none;
}
.footer-bottom a:hover {
  text-decoration: underline;
}
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 10;
  background: var(--accent);
  color: var(--background);
  padding: 10px 18px;
  transform: translateY(-200%);
}
.skip-link:focus {
  transform: none;
}
.product-hero {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 70px;
  align-items: center;
  padding: 66px 0 76px;
}
.product-hero .status {
  margin: 12px 0 22px;
}
.product-hero h1 {
  font-size: clamp(40px, 4.8vw, 64px);
  margin-bottom: 25px;
}
.product-hero .button {
  margin-top: 28px;
}
.receipt {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.receipt-top {
  font-size: 11px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  letter-spacing: 0.08em;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--border);
}
.receipt h2 {
  font-size: 24px;
  margin: 22px 0 16px;
}
.receipt > p[lang] {
  font-size: 18px;
  line-height: 1.9;
  margin-bottom: 20px;
}
.receipt-time {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--muted);
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.receipt-time s {
  font-size: 25px;
}
.receipt-time.final {
  color: var(--accent);
}
.receipt-time strong {
  font-size: 38px;
  font-weight: 600;
  letter-spacing: -0.04em;
}
.receipt > .fine {
  margin-top: 20px;
}
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.scenario-grid article {
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.scenario-grid span,
.journey span {
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0.05em;
}
.scenario-grid h3 {
  font-size: 21px;
  margin: 16px 0 12px;
}
.scenario-grid p {
  font-size: 14px;
  color: var(--muted);
}
.split {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 70px;
}
.split h2 {
  margin-top: 15px;
}
.split > div > p {
  color: var(--muted);
  margin-bottom: 18px;
  font-size: 16px;
}
.split blockquote {
  margin: 24px 0;
  padding-left: 24px;
  border-left: 2px solid var(--accent);
  font-size: 24px;
  font-family: Georgia, serif;
}
.closing {
  text-align: center;
  padding: 52px 24px 72px;
}
.closing p {
  color: var(--muted);
  margin: 20px auto 25px;
  max-width: 44em;
}
.speaking-card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 28px;
  border-radius: 8px;
}
.speaking-card h2 {
  font-size: 32px;
  line-height: 1.3;
  font-family: Georgia, serif;
  font-weight: 400;
  margin: 16px 0;
}
.speaking-card > p {
  color: var(--muted);
  font-size: 14px;
}
.speaking-card ol {
  padding-left: 22px;
  margin: 25px 0;
}
.speaking-card li {
  padding: 9px 0;
  font-size: 14px;
  color: var(--muted);
}
.speaking-card li span {
  display: block;
  color: var(--foreground);
  font-weight: 600;
}
.speaking-card .sample-label {
  font-size: 11px;
}
.journey {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 38px;
  margin: 36px 0 24px;
}
.journey article {
  border-top: 1px solid var(--border);
  padding-top: 20px;
}
.journey h3 {
  font-size: 23px;
  margin: 16px 0;
}
.journey p {
  color: var(--muted);
  font-size: 15px;
}
.policy {
  max-width: 760px;
  margin: 64px auto 80px;
}
.policy h1 {
  font-size: 48px;
  margin: 16px 0;
}
.policy-date {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 30px;
}
.policy h2 {
  font-size: 25px;
  margin: 34px 0 14px;
}
.policy > p:not(.policy-date) {
  line-height: 1.95;
  color: var(--muted);
  margin-bottom: 15px;
}
.not-found {
  padding: 90px 0;
}
@media (max-width: 1050px) {
  .shell {
    width: calc(100% - 64px);
  }
  .hero,
  .product-hero {
    gap: 35px;
  }
  .hero h1 {
    font-size: 52px;
  }
  .updates {
    gap: 36px;
    padding: 32px;
  }
  .approach,
  .split {
    gap: 40px;
  }
  .scenario-grid {
    grid-template-columns: 1fr 1fr;
  }
  .hero-study {
    padding: 23px;
  }
  .product-hero h1 {
    font-size: 46px;
  }
}
@media (max-width: 760px) {
  .shell {
    width: calc(100% - 40px);
  }
  .site-header {
    min-height: 90px;
    gap: 12px;
    flex-wrap: wrap;
    padding: 18px 0;
  }
  .brand > span {
    font-size: 25px;
  }
  .brand svg {
    width: 32px;
    height: 32px;
  }
  .endorsement {
    font-size: 11px;
    padding-left: 12px;
  }
  .site-header nav {
    gap: 22px;
  }
  .site-header nav a {
    font-size: 13px;
  }
  .hero,
  .product-hero {
    grid-template-columns: 1fr;
    padding: 42px 0 50px;
    gap: 35px;
  }
  .hero h1,
  .product-hero h1 {
    font-size: clamp(36px, 7.4vw, 54px);
    line-height: 1.3;
  }
  .lead {
    font-size: 16px;
  }
  .hero-study {
    transform: none;
    max-width: 520px;
    width: 100%;
    justify-self: center;
  }
  .number-pair {
    font-size: 44px;
    padding: 25px 0;
  }
  .section {
    padding: 34px 0 42px;
  }
  .section-heading {
    align-items: start;
    flex-direction: column;
    gap: 16px;
  }
  .section-heading > p br {
    display: none;
  }
  .product-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .product-card {
    padding: 24px;
  }
  .product-top {
    margin-bottom: 18px;
  }
  .approach,
  .split {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .updates {
    grid-template-columns: 1fr;
    padding: 26px 22px;
    gap: 28px;
    margin: 0 0 38px;
  }
  .updates h2 br {
    display: none;
  }
  .updates-panel .button {
    width: 100%;
  }
  .journey {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .journey h3 {
    margin: 8px 0;
  }
  .footer-top {
    gap: 15px;
  }
  .footer-top > p {
    width: 100%;
  }
  .appearance-control {
    margin-left: 0;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
  }
  .footer-bottom nav {
    flex-wrap: wrap;
    gap: 22px;
  }
  .closing {
    padding: 32px 0 50px;
  }
  .receipt,
  .speaking-card {
    padding: 24px;
  }
  .policy {
    margin: 38px auto 50px;
  }
  .policy h1 {
    font-size: 38px;
  }
}
@media (max-width: 480px) {
  .site-header nav {
    width: 100%;
    justify-content: space-between;
    margin: 4px 0 0;
    gap: 14px;
  }
  .site-header {
    row-gap: 3px;
  }
  .nav-update {
    gap: 6px;
  }
  .hero h1,
  .product-hero h1 {
    font-size: 36px;
    letter-spacing: -0.07em;
  }
  .actions {
    gap: 10px 20px;
  }
  .button {
    font-size: 14px;
  }
  .scenario-grid {
    gap: 20px;
  }
  .scenario-grid h3 {
    font-size: 19px;
  }
  .number-pair {
    font-size: 40px;
  }
  .sample-quote {
    font-size: 19px;
  }
  .study-caption {
    gap: 13px;
  }
  .study-caption p {
    font-size: 13px;
  }
  h2 {
    font-size: 27px;
  }
  .product-card h3 {
    font-size: 27px;
  }
  .split blockquote {
    font-size: 21px;
  }
  .appearance-control select {
    max-width: 150px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}