:root {
  color-scheme: light;
  --ink: #07162f;
  --ink-soft: #1a3152;
  --muted: #60738d;
  --blue: #087ff5;
  --blue-bright: #24a9ff;
  --blue-deep: #075acb;
  --sky: #e9f4ff;
  --ice: #f7fbff;
  --white: #ffffff;
  --line: #dbe8f5;
  --navy: #06162f;
  --navy-soft: #0b2448;
  --green: #18ad7a;
  --shadow: 0 28px 80px rgba(13, 79, 145, 0.14);
  --shadow-soft: 0 18px 48px rgba(13, 79, 145, 0.1);
  --container: min(1200px, calc(100vw - 40px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button,
select {
  font: inherit;
}

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

svg {
  width: 1.25em;
  height: 1.25em;
}

.container {
  width: var(--container);
  margin-inline: auto;
}

.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;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--navy);
  color: var(--white);
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  border-bottom: 1px solid transparent;
  background: rgba(247, 251, 255, 0.68);
  backdrop-filter: blur(18px);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.site-header.scrolled,
.internal-page .site-header {
  border-color: rgba(116, 155, 196, 0.18);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 8px 32px rgba(25, 70, 120, 0.06);
}

.nav-shell {
  display: flex;
  min-height: 78px;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 20px;
  font-weight: 820;
  letter-spacing: -0.04em;
}

.brand img {
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(8, 127, 245, 0.22);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav > a:not(.button) {
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 680;
  transition: color 0.2s ease;
}

.site-nav > a:not(.button):hover,
.site-nav > a:not(.button):focus-visible,
.site-nav > a[aria-current="page"] {
  color: var(--blue);
}

.language-control {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
}

.language-control svg {
  width: 17px;
  height: 17px;
}

.language-control select {
  max-width: 104px;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 680;
  outline: none;
}

.language-control:focus-within {
  border-radius: 8px;
  box-shadow: 0 0 0 3px rgba(8, 127, 245, 0.18);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 0;
  background: transparent;
  color: var(--ink);
}

.menu-toggle span:not(.sr-only) {
  display: block;
  width: 23px;
  height: 2px;
  margin: 5px auto;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 14px;
  font-weight: 760;
  line-height: 1.15;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button svg,
.text-link svg {
  width: 18px;
  height: 18px;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-small {
  min-height: 42px;
  padding: 10px 16px;
  border-radius: 12px;
  background: var(--navy);
  color: var(--white);
  font-size: 13px;
}

.button-primary {
  background: linear-gradient(135deg, var(--blue-bright), var(--blue));
  color: var(--white);
  box-shadow: 0 16px 38px rgba(8, 127, 245, 0.27);
}

.button-primary:hover,
.button-primary:focus-visible {
  box-shadow: 0 20px 44px rgba(8, 127, 245, 0.34);
}

.button-ghost {
  border-color: #b9d5ef;
  background: rgba(255, 255, 255, 0.62);
  color: var(--ink);
}

.button-dark {
  background: var(--navy);
  color: var(--white);
}

.button-light {
  background: var(--white);
  color: var(--navy);
  box-shadow: 0 14px 36px rgba(1, 18, 47, 0.2);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--blue-deep);
  font-size: 14px;
  font-weight: 760;
}

.text-link svg {
  transition: transform 0.2s ease;
}

.text-link:hover svg,
.text-link:focus-visible svg {
  transform: translateX(4px);
}

.hero {
  position: relative;
  min-height: 850px;
  overflow: hidden;
  padding: 150px 0 96px;
  background:
    radial-gradient(circle at 76% 24%, rgba(49, 166, 255, 0.23), transparent 26%),
    radial-gradient(circle at 10% 90%, rgba(98, 172, 255, 0.13), transparent 33%),
    linear-gradient(145deg, #f9fcff 0%, #edf6ff 56%, #e4f2ff 100%);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 170px;
  background: linear-gradient(to top, var(--white), transparent);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: 40px;
  align-items: center;
}

.hero-copy {
  padding: 28px 0 50px;
}

.eyebrow,
.kicker {
  margin: 0 0 18px;
  color: var(--blue-deep);
  font-size: 12px;
  font-weight: 820;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
}

.eyebrow span {
  position: relative;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 8px rgba(8, 127, 245, 0.1);
}

.hero h1 {
  max-width: 680px;
  margin: 0;
  font-size: clamp(48px, 4.55vw, 70px);
  font-weight: 840;
  letter-spacing: -0.058em;
  line-height: 0.98;
}

.hero h1 em {
  display: block;
  padding-top: 8px;
  background: linear-gradient(90deg, var(--blue-deep), var(--blue-bright));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-style: normal;
}

.hero h1 > span {
  display: block;
  font-size: 0.86em;
  white-space: nowrap;
}

.hero-lede {
  max-width: 600px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.72;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.proof-list {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin: 28px 0 0;
  padding: 0;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 680;
  list-style: none;
}

.proof-list li {
  display: flex;
  align-items: center;
  gap: 7px;
}

.proof-list svg {
  width: 16px;
  height: 16px;
  color: var(--green);
  stroke-width: 2.4;
}

.hero-visual {
  position: relative;
  min-width: 0;
  padding: 74px 38px 40px;
}

.hero-mac {
  position: relative;
  z-index: 2;
  overflow: hidden;
  border: 10px solid rgba(255, 255, 255, 0.78);
  border-radius: 30px;
  background: var(--white);
  box-shadow: 0 38px 90px rgba(26, 91, 154, 0.2);
  transform: perspective(1200px) rotateY(-4deg) rotateX(1deg);
}

.hero-mac img {
  width: 100%;
}

.hero-phone {
  position: absolute;
  right: -6px;
  bottom: -50px;
  z-index: 4;
  width: min(28%, 205px);
  overflow: hidden;
  border: 7px solid rgba(255, 255, 255, 0.94);
  border-radius: 30px;
  background: var(--white);
  box-shadow: 0 30px 70px rgba(8, 67, 132, 0.28);
  transform: rotate(4deg);
}

.hero-phone img {
  width: 100%;
}

.hero-app-badge {
  position: absolute;
  top: 14px;
  left: 4px;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 15px 10px 10px;
  border: 1px solid rgba(255, 255, 255, 0.86);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(16px);
}

.hero-app-badge img {
  border-radius: 13px;
}

.hero-app-badge span,
.hero-app-badge strong,
.hero-app-badge small {
  display: block;
}

.hero-app-badge strong {
  font-size: 15px;
}

.hero-app-badge small {
  color: var(--muted);
  font-size: 11px;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(4px);
}

.orb-one {
  top: 100px;
  right: -110px;
  width: 410px;
  height: 410px;
  border: 1px solid rgba(255, 255, 255, 0.75);
  background: rgba(143, 204, 255, 0.19);
}

.orb-two {
  left: 35%;
  bottom: 60px;
  width: 170px;
  height: 170px;
  background: rgba(255, 255, 255, 0.38);
}

.wave-field {
  position: absolute;
  inset: auto -4% 45px;
  height: 240px;
  opacity: 0.65;
}

.wave-field i,
.final-wave i {
  position: absolute;
  inset: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.95);
  border-radius: 50%;
  transform: translateY(var(--wave-y, 0)) scaleY(var(--wave-s, 1));
}

.wave-field i:nth-child(1) { --wave-y: 75px; --wave-s: 0.5; }
.wave-field i:nth-child(2) { --wave-y: 50px; --wave-s: 0.68; }
.wave-field i:nth-child(3) { --wave-y: 25px; --wave-s: 0.84; }
.wave-field i:nth-child(4) { --wave-y: 0; --wave-s: 1; }
.wave-field i:nth-child(5) { --wave-y: -24px; --wave-s: 1.14; }

.section {
  padding: 112px 0;
}

.section-heading {
  max-width: 790px;
  margin: 0 auto 54px;
  text-align: center;
}

.section-heading h2,
.how-heading h2,
.faq-heading h2,
.contact-card h2 {
  margin: 0;
  font-size: clamp(38px, 4.4vw, 58px);
  font-weight: 830;
  letter-spacing: -0.055em;
  line-height: 1.05;
}

.section-heading > p:last-child,
.how-heading > p:last-child {
  max-width: 680px;
  margin: 20px auto 0;
  color: var(--muted);
  font-size: 18px;
}

.feature-section {
  background: var(--white);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.feature-card {
  position: relative;
  display: flex;
  min-height: 580px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 32px;
  background:
    radial-gradient(circle at 80% 20%, rgba(89, 181, 255, 0.16), transparent 28%),
    var(--ice);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.feature-card:nth-child(1) {
  grid-column: span 7;
}

.feature-card:nth-child(2) {
  grid-column: span 5;
}

.feature-card:nth-child(3),
.feature-card:nth-child(4) {
  grid-column: span 6;
}

.feature-copy {
  position: relative;
  z-index: 3;
  width: 47%;
  padding: 42px 18px 42px 42px;
}

.feature-copy h3 {
  margin: 18px 0 0;
  font-size: clamp(27px, 3vw, 39px);
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.feature-copy p {
  margin: 17px 0 24px;
  color: var(--muted);
}

.feature-number {
  color: var(--blue);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.14em;
}

.feature-media {
  position: absolute;
  right: -6%;
  bottom: -4%;
  width: 70%;
}

.feature-media img {
  border: 8px solid rgba(255, 255, 255, 0.78);
  border-radius: 22px;
  box-shadow: 0 28px 60px rgba(18, 80, 140, 0.15);
  transform: rotate(-2deg);
}

.phone-feature {
  background:
    radial-gradient(circle at 50% 65%, rgba(31, 151, 255, 0.25), transparent 42%),
    linear-gradient(160deg, #edf7ff, #f8fbff);
}

.phone-feature .feature-copy {
  width: 100%;
  padding-right: 42px;
}

.phone-feature .feature-media {
  right: 50%;
  bottom: -46%;
  width: 50%;
  transform: translateX(50%);
}

.phone-feature .feature-media img {
  border-width: 7px;
  border-radius: 28px;
  transform: rotate(0);
}

.how-section {
  color: var(--white);
  background:
    radial-gradient(circle at 88% 10%, rgba(21, 142, 255, 0.18), transparent 28%),
    linear-gradient(145deg, var(--navy), #0a2447);
}

.how-shell {
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  gap: 80px;
  align-items: start;
}

.how-heading {
  position: sticky;
  top: 132px;
}

.how-heading .kicker {
  color: var(--blue-bright);
}

.how-heading > p:last-child {
  margin-left: 0;
  color: #a9bbd1;
}

.step-grid {
  display: grid;
  gap: 18px;
}

.step-grid article {
  position: relative;
  padding: 34px 36px 36px 92px;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.055);
}

.step-grid article > span {
  position: absolute;
  top: 33px;
  left: 34px;
  color: var(--blue-bright);
  font-size: 13px;
  font-weight: 820;
  letter-spacing: 0.12em;
}

.step-grid h3 {
  margin: 0;
  font-size: 24px;
  letter-spacing: -0.03em;
}

.step-grid p {
  margin: 9px 0 0;
  color: #a9bbd1;
}

.use-section {
  background: var(--ice);
}

.split-heading {
  max-width: 900px;
}

.use-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.use-grid article {
  min-height: 290px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--white);
  box-shadow: 0 18px 44px rgba(26, 77, 131, 0.06);
}

.case-icon,
.platform-icon {
  display: grid;
  width: 54px;
  height: 54px;
  place-items: center;
  border-radius: 16px;
  background: var(--sky);
  color: var(--blue);
}

.case-icon svg,
.platform-icon svg {
  width: 26px;
  height: 26px;
}

.use-grid h3 {
  margin: 58px 0 0;
  font-size: 22px;
  letter-spacing: -0.035em;
}

.use-grid p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.platform-section {
  background: var(--white);
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.platform-card {
  position: relative;
  min-height: 390px;
  padding: 34px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 28px;
  background:
    radial-gradient(circle at 100% 0, rgba(35, 164, 255, 0.2), transparent 36%),
    linear-gradient(155deg, #fff, #f3f9ff);
}

.platform-card::after {
  content: "";
  position: absolute;
  right: -55px;
  bottom: -70px;
  width: 190px;
  height: 190px;
  border: 32px solid rgba(8, 127, 245, 0.045);
  border-radius: 50%;
}

.platform-card .status {
  position: absolute;
  top: 34px;
  right: 34px;
  padding: 6px 9px;
  border-radius: 999px;
  background: #e8f7f1;
  color: #0a8b61;
  font-size: 10px;
  font-weight: 820;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.platform-card .status.soon {
  background: #e9f3ff;
  color: var(--blue-deep);
}

.platform-card h3 {
  margin: 46px 0 0;
  font-size: 34px;
  letter-spacing: -0.05em;
}

.platform-card > p:not(.store-pending) {
  min-height: 76px;
  margin: 12px 0 22px;
  color: var(--muted);
}

.store-pending {
  position: relative;
  z-index: 1;
  max-width: 280px;
  margin: 28px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 680;
}

.faq-section {
  background: var(--ice);
}

.faq-grid {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 80px;
  align-items: start;
}

.faq-heading {
  position: sticky;
  top: 128px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-list details {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--white);
}

.faq-list summary {
  display: flex;
  min-height: 78px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 760;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary i {
  position: relative;
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.faq-list summary i::before,
.faq-list summary i::after {
  content: "";
  position: absolute;
  top: 8px;
  left: 2px;
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--blue);
  transition: transform 0.2s ease;
}

.faq-list summary i::after {
  transform: rotate(90deg);
}

.faq-list details[open] summary i::after {
  transform: rotate(0);
}

.faq-list details p {
  margin: 0;
  padding: 0 60px 24px 24px;
  color: var(--muted);
}

.final-section {
  padding-top: 92px;
}

.final-card {
  position: relative;
  display: flex;
  min-height: 400px;
  align-items: center;
  justify-content: space-between;
  gap: 44px;
  overflow: hidden;
  padding: 58px 64px;
  border-radius: 34px;
  color: var(--white);
  background:
    radial-gradient(circle at 76% 18%, rgba(45, 169, 255, 0.36), transparent 28%),
    linear-gradient(135deg, #07172f, #0b3162);
}

.final-card > div:not(.final-wave) {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.final-card img {
  border-radius: 18px;
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.22);
}

.final-card h2 {
  margin: 24px 0 0;
  font-size: clamp(38px, 5vw, 62px);
  letter-spacing: -0.06em;
  line-height: 1;
}

.final-card p {
  max-width: 610px;
  margin: 18px 0 0;
  color: #bfd1e6;
  font-size: 17px;
}

.final-card .button {
  position: relative;
  z-index: 2;
  flex: 0 0 auto;
}

.final-wave {
  position: absolute;
  inset: 48% -10% auto;
  height: 240px;
  opacity: 0.22;
}

.final-wave i:nth-child(1) { --wave-y: 65px; --wave-s: 0.56; }
.final-wave i:nth-child(2) { --wave-y: 38px; --wave-s: 0.74; }
.final-wave i:nth-child(3) { --wave-y: 10px; --wave-s: 0.92; }
.final-wave i:nth-child(4) { --wave-y: -18px; --wave-s: 1.08; }
.final-wave i:nth-child(5) { --wave-y: -46px; --wave-s: 1.22; }

.site-footer {
  margin-top: 110px;
  padding: 70px 0 24px;
  border-top: 1px solid var(--line);
  background: #f7faff;
}

.footer-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 80px;
}

.footer-brand-block p {
  max-width: 320px;
  margin: 18px 0 12px;
  color: var(--muted);
}

.footer-apple-id {
  color: #8293aa;
  font-size: 12px;
  font-weight: 680;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.footer-column {
  display: grid;
  align-content: start;
  gap: 11px;
}

.footer-column h2 {
  margin: 0 0 7px;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.footer-column a {
  color: var(--muted);
  font-size: 13px;
}

.footer-column a:hover,
.footer-column a:focus-visible {
  color: var(--blue);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 58px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: #8293aa;
  font-size: 12px;
}

/* Internal pages */
.internal-page {
  background: var(--ice);
}

.internal-hero {
  padding: 174px 0 90px;
  background:
    radial-gradient(circle at 85% 10%, rgba(52, 171, 255, 0.22), transparent 27%),
    linear-gradient(145deg, #f9fcff, #e8f4ff);
}

.internal-hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 80px;
  align-items: end;
}

.internal-hero h1,
.about-hero h1,
.article-hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(48px, 6.2vw, 82px);
  font-weight: 840;
  letter-spacing: -0.066em;
  line-height: 0.98;
}

.internal-hero-grid > p {
  max-width: 520px;
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 19px;
}

html[lang="zh-CN"] .internal-hero h1 {
  max-width: 540px;
  font-size: clamp(54px, 5.5vw, 70px);
  letter-spacing: -0.045em;
}

html[lang="zh-CN"] .about-hero h1 {
  max-width: 720px;
  font-size: clamp(48px, 4.4vw, 58px);
  letter-spacing: -0.035em;
  line-height: 1.02;
}

.guides-section {
  background: var(--ice);
}

.guide-grid {
  display: grid;
  gap: 26px;
}

.guide-card {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  min-height: 390px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--white);
}

.guide-image {
  position: relative;
  min-height: 330px;
  overflow: hidden;
  background: var(--sky);
}

.guide-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.guide-image:hover img,
.guide-image:focus-visible img {
  transform: scale(1.025);
}

.guide-copy {
  align-self: center;
  padding: 48px 58px;
}

.guide-meta {
  display: flex;
  gap: 18px;
  color: var(--blue-deep);
  font-size: 11px;
  font-weight: 820;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.guide-copy h2 {
  margin: 18px 0 0;
  font-size: clamp(29px, 3.4vw, 44px);
  letter-spacing: -0.05em;
  line-height: 1.08;
}

.guide-copy p {
  margin: 16px 0 22px;
  color: var(--muted);
}

.about-hero {
  padding: 166px 0 98px;
  background:
    radial-gradient(circle at 76% 25%, rgba(42, 164, 255, 0.2), transparent 26%),
    linear-gradient(150deg, #f9fcff, #e6f3ff);
}

.about-hero-grid {
  display: grid;
  grid-template-columns: 1fr 0.65fr;
  gap: 70px;
  align-items: center;
}

.about-lede {
  max-width: 730px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 20px;
}

.about-symbol {
  position: relative;
  display: grid;
  min-height: 430px;
  place-items: center;
}

.about-symbol > img {
  position: relative;
  z-index: 2;
  width: 220px;
  border-radius: 56px;
  box-shadow: 0 36px 80px rgba(8, 87, 163, 0.22);
}

.symbol-wave {
  position: absolute;
  inset: 24% -6% auto;
  height: 240px;
}

.symbol-wave i {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: calc(30px + var(--index) * 20px);
  border: 2px solid rgba(8, 127, 245, 0.12);
  border-width: 2px 0 0;
  border-radius: 50%;
}

.symbol-wave i:nth-child(1) { --index: 1; transform: translateY(-30px); }
.symbol-wave i:nth-child(2) { --index: 2; transform: translateY(-15px); }
.symbol-wave i:nth-child(3) { --index: 3; }
.symbol-wave i:nth-child(4) { --index: 4; transform: translateY(15px); }
.symbol-wave i:nth-child(5) { --index: 5; transform: translateY(30px); }

.quote-section {
  padding: 100px 0;
  color: var(--white);
  background: var(--navy);
}

.quote-section blockquote {
  max-width: 980px;
  margin: 0;
  font-size: clamp(38px, 5.3vw, 68px);
  font-weight: 760;
  letter-spacing: -0.055em;
  line-height: 1.08;
}

.principle-section {
  background: var(--white);
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.principle-grid article {
  min-height: 330px;
  padding: 30px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.principle-grid span {
  color: var(--blue);
  font-size: 12px;
  font-weight: 820;
  letter-spacing: 0.12em;
}

.principle-grid h2 {
  margin: 100px 0 0;
  font-size: 28px;
  letter-spacing: -0.04em;
}

.principle-grid p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.contact-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
  padding: 56px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: var(--white);
}

.contact-card > div {
  max-width: 720px;
}

.contact-card p:last-child {
  margin: 16px 0 0;
  color: var(--muted);
}

/* Tutorial articles */
.article-hero {
  padding: 158px 0 80px;
  background:
    radial-gradient(circle at 82% 14%, rgba(49, 172, 255, 0.2), transparent 27%),
    linear-gradient(150deg, #fbfdff, #e9f5ff);
}

.article-hero-grid {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 70px;
  align-items: center;
}

.back-link {
  display: inline-block;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--blue);
}

.article-intro {
  max-width: 680px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 19px;
}

html[lang="zh-CN"] .article-hero h1 {
  font-size: clamp(50px, 4.8vw, 62px);
  letter-spacing: -0.04em;
}

.article-image {
  overflow: hidden;
  border: 9px solid rgba(255, 255, 255, 0.8);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.article-body {
  max-width: 980px;
  padding-top: 90px;
  padding-bottom: 110px;
}

.article-steps {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.article-steps li {
  display: grid;
  grid-template-columns: 86px 1fr;
  gap: 30px;
  padding: 42px 0;
  border-bottom: 1px solid var(--line);
}

.article-steps li > span {
  color: var(--blue);
  font-size: 15px;
  font-weight: 850;
  letter-spacing: 0.12em;
}

.article-steps h2 {
  margin: 0;
  font-size: 30px;
  letter-spacing: -0.04em;
}

.article-steps p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.article-tip {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 22px;
  margin-top: 58px;
  padding: 30px;
  border: 1px solid #b9daf7;
  border-radius: 20px;
  background: #eaf6ff;
}

.article-tip > div:first-child {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 16px;
  background: var(--white);
  color: var(--blue);
}

.article-tip h2 {
  margin: 0;
  font-size: 20px;
}

.article-tip p {
  margin: 8px 0 0;
  color: var(--muted);
}

/* Audio-to-text keyword landing pages */
.keyword-hero {
  position: relative;
  overflow: hidden;
  padding: 150px 0 118px;
  background:
    radial-gradient(circle at 82% 22%, rgba(36, 169, 255, 0.23), transparent 28%),
    radial-gradient(circle at 12% 88%, rgba(8, 127, 245, 0.12), transparent 30%),
    linear-gradient(145deg, #fbfdff 0%, #edf7ff 52%, #e5f3ff 100%);
}

.keyword-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 100px;
  background: linear-gradient(to top, var(--white), transparent);
  pointer-events: none;
}

.keyword-hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
  align-items: center;
}

.keyword-hero-copy {
  max-width: 640px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 680;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--blue);
}

.keyword-hero h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(48px, 4.8vw, 70px);
  font-weight: 840;
  letter-spacing: -0.058em;
  line-height: 1.02;
}

html[lang="zh-CN"] .keyword-hero h1 {
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.keyword-hero .hero-lede {
  max-width: 650px;
}

.keyword-hero-visual {
  position: relative;
  padding: 18px 0 32px 48px;
}

.keyword-hero-visual > img {
  overflow: hidden;
  border: 9px solid rgba(255, 255, 255, 0.82);
  border-radius: 30px;
  box-shadow: var(--shadow);
}

.keyword-phone {
  position: absolute;
  bottom: -4%;
  left: -1%;
  width: 25%;
  overflow: hidden;
  border: 7px solid rgba(255, 255, 255, 0.94);
  border-radius: 28px;
  box-shadow: 0 24px 64px rgba(6, 44, 91, 0.24);
}

.keyword-phone img {
  width: 100%;
}

.section-heading .text-link {
  margin-top: 22px;
}

.keyword-accuracy {
  max-width: 980px;
  margin: 56px auto 0;
}

.not-found {
  display: grid;
  min-height: 100vh;
  place-content: center;
  justify-items: center;
  padding: 40px;
  text-align: center;
  background: linear-gradient(145deg, #f9fcff, #e8f4ff);
}

.not-found img {
  border-radius: 20px;
}

.not-found .kicker {
  margin-top: 24px;
}

.not-found h1 {
  margin: 0;
  font-size: clamp(42px, 7vw, 72px);
  letter-spacing: -0.06em;
}

.not-found p:not(.kicker) {
  margin: 16px 0 28px;
  color: var(--muted);
}

.legal-main {
  padding: 154px 0 112px;
  background:
    radial-gradient(circle at 88% 4%, rgba(36, 169, 255, 0.12), transparent 24%),
    var(--ice);
}

.legal-shell {
  display: grid;
  grid-template-columns: minmax(190px, 0.32fr) minmax(0, 790px);
  justify-content: space-between;
  gap: 80px;
}

.legal-aside {
  position: sticky;
  top: 112px;
  align-self: start;
}

.legal-aside .kicker {
  color: var(--blue);
}

.legal-aside nav {
  display: grid;
  gap: 8px;
  margin-top: 24px;
}

.legal-aside nav a {
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  font-weight: 720;
}

.legal-aside nav a:hover,
.legal-aside nav a[aria-current="page"] {
  color: var(--ink);
}

.legal-document {
  min-width: 0;
}

.legal-document > header {
  padding-bottom: 38px;
  border-bottom: 1px solid var(--line);
}

.legal-document h1 {
  margin: 18px 0 20px;
  font-size: clamp(50px, 7vw, 82px);
  line-height: 0.96;
  letter-spacing: -0.06em;
}

.legal-updated {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

.legal-intro {
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: 19px;
  line-height: 1.7;
}

.legal-section {
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}

.legal-section h2 {
  margin: 0 0 18px;
  font-size: clamp(25px, 3vw, 34px);
  line-height: 1.15;
  letter-spacing: -0.035em;
}

.legal-section h3 {
  margin: 28px 0 10px;
  font-size: 18px;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.legal-section p {
  margin: 0 0 14px;
  color: #3e536d;
}

.legal-section ul {
  margin: 12px 0 18px;
  padding-left: 24px;
  color: #3e536d;
}

.legal-section li + li {
  margin-top: 8px;
}

.legal-section a,
.legal-contact a {
  color: var(--blue-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.legal-facts {
  display: grid;
  grid-template-columns: minmax(130px, 0.35fr) 1fr;
  gap: 10px 24px;
  margin: 22px 0 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--white);
  box-shadow: var(--shadow-soft);
}

.legal-facts dt {
  color: var(--muted);
  font-size: 13px;
  font-weight: 760;
}

.legal-facts dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
}

.legal-resources {
  margin-top: 30px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--white);
}

.legal-resources h3 {
  margin-top: 0;
}

.legal-resources ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 24px;
  margin-bottom: 0;
}

.legal-contact {
  margin-top: 36px;
  padding: 30px;
  border-radius: 24px;
  background: var(--navy);
  color: var(--white);
  box-shadow: var(--shadow);
}

.legal-contact h2 {
  margin: 0 0 12px;
  font-size: 28px;
}

.legal-contact p {
  margin: 0;
  color: rgba(255, 255, 255, 0.76);
}

.legal-contact a {
  color: #8ed3ff;
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

}

@media (max-width: 1080px) {
  .site-nav {
    gap: 17px;
  }

  .site-nav > a:not(.button) {
    font-size: 13px;
  }

  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .hero {
    min-height: 790px;
  }

  .feature-card:nth-child(n) {
    grid-column: span 6;
  }

  .feature-card {
    min-height: 560px;
  }

  .feature-copy {
    width: 100%;
    padding-right: 38px;
  }

  .feature-media {
    right: -8%;
    bottom: -4%;
    width: 82%;
  }

  .phone-feature .feature-media {
    width: 46%;
  }

  .use-grid,
  .principle-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 50px;
  }

  .legal-shell {
    gap: 48px;
  }
}

@media (max-width: 860px) {
  .menu-toggle {
    display: block;
    z-index: 102;
  }

  .menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 101;
    display: flex;
    align-items: stretch;
    justify-content: center;
    flex-direction: column;
    gap: 0;
    padding: 98px 24px 32px;
    background: rgba(247, 251, 255, 0.98);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-14px);
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .site-nav.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav > a:not(.button) {
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
    font-size: 22px;
  }

  .language-control {
    margin: 20px 0;
    padding: 12px 0;
  }

  .language-control select {
    max-width: none;
    font-size: 16px;
  }

  .site-nav .button {
    width: 100%;
  }

  .hero {
    min-height: auto;
    padding-top: 126px;
  }

  .hero-grid,
  .keyword-hero-grid,
  .how-shell,
  .faq-grid,
  .internal-hero-grid,
  .about-hero-grid,
  .article-hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    padding-bottom: 0;
  }

  .hero-visual {
    max-width: 700px;
    margin: 0 auto;
    padding-top: 78px;
  }

  .keyword-hero {
    padding: 126px 0 96px;
  }

  .keyword-hero-copy {
    max-width: 760px;
  }

  .keyword-hero-visual {
    max-width: 760px;
    margin: 12px auto 0;
    padding-left: 54px;
  }

  .how-heading,
  .faq-heading {
    position: static;
  }

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

  .platform-card {
    min-height: 330px;
  }

  .internal-hero-grid,
  .article-hero-grid {
    gap: 36px;
  }

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

  .guide-image {
    min-height: 290px;
  }

  .about-symbol {
    min-height: 340px;
  }

  .contact-card {
    align-items: flex-start;
    flex-direction: column;
  }

  .legal-main {
    padding-top: 126px;
  }

  .legal-shell {
    grid-template-columns: 1fr;
  }

  .legal-aside {
    position: static;
  }

  .legal-aside nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (max-width: 680px) {
  :root {
    --container: min(100% - 28px, 1200px);
  }

  .nav-shell {
    min-height: 70px;
  }

  .brand {
    font-size: 18px;
  }

  .brand img {
    width: 38px;
    height: 38px;
  }

  .hero {
    padding: 112px 0 70px;
  }

  .hero h1 {
    font-size: clamp(44px, 13vw, 64px);
  }

  .keyword-hero {
    padding: 110px 0 78px;
  }

  .keyword-hero h1 {
    font-size: clamp(42px, 12.5vw, 60px);
  }

  .keyword-hero-visual {
    padding: 8px 0 30px 28px;
  }

  .keyword-phone {
    left: -2%;
    width: 28%;
    border-width: 5px;
    border-radius: 18px;
  }

  .hero h1 > span {
    font-size: 1em;
    white-space: normal;
  }

  .hero-lede {
    font-size: 17px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .button {
    width: 100%;
  }

  .proof-list {
    display: grid;
    gap: 10px;
  }

  .hero-visual {
    padding: 66px 20px 30px;
  }

  .hero-app-badge {
    left: 0;
  }

  .hero-phone {
    right: 0;
    bottom: -28px;
    width: 30%;
    border-width: 4px;
    border-radius: 18px;
  }

  .hero-mac {
    border-width: 6px;
    border-radius: 20px;
    transform: none;
  }

  .section {
    padding: 82px 0;
  }

  .section-heading {
    margin-bottom: 38px;
    text-align: left;
  }

  .section-heading > p:last-child {
    margin-left: 0;
  }

  .feature-grid {
    display: grid;
    grid-template-columns: 1fr;
  }

  .feature-card:nth-child(n) {
    grid-column: auto;
  }

  .feature-card {
    min-height: 560px;
    border-radius: 24px;
  }

  .feature-copy {
    width: 100%;
    padding: 30px 26px;
  }

  .feature-copy h3 {
    font-size: 30px;
  }

  .feature-media {
    right: -18%;
    bottom: -1%;
    width: 110%;
  }

  .phone-feature .feature-media {
    bottom: -44%;
    width: 56%;
  }

  .how-shell,
  .faq-grid {
    gap: 44px;
  }

  .step-grid article {
    padding: 30px 24px 30px 70px;
  }

  .step-grid article > span {
    top: 29px;
    left: 24px;
  }

  .use-grid,
  .principle-grid {
    grid-template-columns: 1fr;
  }

  .use-grid article {
    min-height: 250px;
  }

  .platform-card {
    padding: 28px;
  }

  .platform-card .status {
    top: 28px;
    right: 28px;
  }

  .final-card {
    align-items: flex-start;
    flex-direction: column;
    padding: 38px 28px;
    border-radius: 26px;
  }

  .final-card .button {
    width: 100%;
  }

  .footer-nav {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 36px;
  }

  .footer-bottom {
    flex-direction: column;
  }

  .internal-hero,
  .about-hero,
  .article-hero {
    padding: 132px 0 68px;
  }

  .internal-hero h1,
  .about-hero h1,
  .article-hero h1 {
    font-size: clamp(43px, 12vw, 64px);
  }

  .guide-copy {
    padding: 32px 26px;
  }

  .guide-card {
    border-radius: 22px;
  }

  .about-symbol {
    min-height: 280px;
  }

  .about-symbol > img {
    width: 170px;
    border-radius: 42px;
  }

  .quote-section {
    padding: 76px 0;
  }

  .principle-grid h2 {
    margin-top: 50px;
  }

  .contact-card {
    padding: 32px 26px;
  }

  .contact-card .button {
    width: 100%;
  }

  .article-body {
    padding-top: 54px;
    padding-bottom: 70px;
  }

  .article-steps li {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 32px 0;
  }

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

  .legal-main {
    padding: 112px 0 76px;
  }

  .legal-document h1 {
    font-size: clamp(43px, 13vw, 60px);
  }

  .legal-intro {
    font-size: 17px;
  }

  .legal-facts {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 20px;
  }

  .legal-facts dd + dt {
    margin-top: 12px;
  }

  .legal-resources ul {
    grid-template-columns: 1fr;
  }

  .legal-contact {
    padding: 26px 22px;
  }
}