:root {
  color-scheme: light;
  --ink: #101828;
  --muted: #5d6b7d;
  --line: #dce5ef;
  --surface: #ffffff;
  --surface-soft: #f4f8fc;
  --blue: #1479d1;
  --blue-dark: #075eaa;
  --cyan: #31c5e8;
  --navy: #0a1930;
  --orange: #ff8b29;
  --shadow: 0 24px 70px rgba(23, 63, 104, 0.15);
  --radius-lg: 32px;
  --radius-md: 22px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--surface);
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
}

img {
  max-width: 100%;
}

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

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: -0.035em;
}

.container {
  width: min(1160px, calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 16px;
  color: #fff;
  background: var(--navy);
  border-radius: 10px;
  transform: translateY(-160%);
  transition: transform 180ms ease;
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.88);
  border-color: rgba(201, 215, 229, 0.7);
  box-shadow: 0 10px 30px rgba(25, 55, 90, 0.06);
  backdrop-filter: blur(18px);
}

.nav-wrap {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 760;
  letter-spacing: -0.02em;
}

.brand img {
  flex: 0 0 auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  color: #3c4b5f;
  font-size: 15px;
  font-weight: 650;
}

.nav-links > a:not(.button) {
  padding: 10px 0;
}

.nav-links > a:not(.button):hover {
  color: var(--blue-dark);
}

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 720;
  line-height: 1;
  white-space: nowrap;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, border-color 180ms ease;
}

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

.button:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(49, 197, 232, 0.55);
  outline-offset: 4px;
}

.button svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button-small {
  min-height: 42px;
  padding-inline: 18px;
  color: #fff;
  background: var(--navy);
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--blue-dark), var(--blue));
  box-shadow: 0 13px 30px rgba(20, 121, 209, 0.26);
}

.button-primary:hover {
  box-shadow: 0 17px 36px rgba(20, 121, 209, 0.33);
}

.button-ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.72);
  border-color: var(--line);
}

.hero {
  position: relative;
  min-height: 860px;
  overflow: hidden;
  padding: 138px 0 84px;
  background:
    radial-gradient(circle at 18% 16%, rgba(84, 200, 245, 0.19), transparent 30%),
    linear-gradient(180deg, #f4faff 0%, #fff 88%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.46;
  background-image: radial-gradient(circle, rgba(20, 121, 209, 0.2) 1px, transparent 1.5px);
  background-size: 38px 38px;
  mask-image: linear-gradient(to right, #000, transparent 48%);
  pointer-events: none;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  pointer-events: none;
}

.hero-orb-one {
  width: 480px;
  height: 480px;
  top: 100px;
  right: -190px;
  background: rgba(107, 91, 255, 0.1);
}

.hero-orb-two {
  width: 260px;
  height: 260px;
  bottom: 40px;
  left: -120px;
  background: rgba(49, 197, 232, 0.13);
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(440px, 0.97fr);
  align-items: center;
  gap: 60px;
}

.hero-copy {
  position: relative;
  z-index: 3;
  padding-bottom: 36px;
}

.eyebrow,
.section-kicker {
  color: var(--blue-dark);
  font-size: 14px;
  font-weight: 760;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 22px;
  padding: 8px 13px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(176, 206, 231, 0.8);
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(30, 85, 130, 0.08);
}

.eyebrow span {
  width: 8px;
  height: 8px;
  background: #1fca8c;
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(31, 202, 140, 0.12);
}

.hero h1 {
  margin-bottom: 26px;
  font-size: clamp(56px, 6.4vw, 86px);
  font-weight: 820;
  letter-spacing: -0.07em;
}

.hero h1 em {
  color: transparent;
  font-style: normal;
  background: linear-gradient(100deg, #0874bd 0%, #1fa9d1 56%, #4c73dc 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-lead {
  max-width: 610px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(18px, 1.65vw, 21px);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 13px;
}

.download-meta {
  margin: 15px 0 0 14px;
  color: #778597;
  font-size: 13px;
}

.hero-visual {
  position: relative;
  min-height: 660px;
  display: grid;
  place-items: center;
}

.visual-halo {
  position: absolute;
  width: 510px;
  height: 510px;
  border: 1px solid rgba(20, 121, 209, 0.14);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(49, 197, 232, 0.22), rgba(255, 255, 255, 0.2) 64%, transparent 65%);
}

.phone {
  position: relative;
  overflow: hidden;
  background: #111827;
  border: 9px solid #111827;
  border-radius: 45px;
  box-shadow: var(--shadow);
}

.phone::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 35px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.13);
  pointer-events: none;
}

.phone-speaker {
  position: absolute;
  z-index: 2;
  top: 8px;
  left: 50%;
  width: 28%;
  height: 18px;
  border-radius: 999px;
  background: #111827;
  transform: translateX(-50%);
}

.phone img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.phone-hero {
  z-index: 2;
  width: 294px;
  aspect-ratio: 9 / 20;
  transform: rotate(2.2deg);
  box-shadow: 0 34px 90px rgba(25, 68, 110, 0.24);
}

.hero-robot {
  position: absolute;
  z-index: 3;
  right: -54px;
  bottom: 12px;
  width: 215px;
  filter: drop-shadow(0 20px 28px rgba(44, 92, 135, 0.2));
}

.floating-note {
  position: absolute;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 15px;
  color: #234158;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(190, 210, 228, 0.85);
  border-radius: 15px;
  box-shadow: 0 13px 30px rgba(25, 65, 100, 0.12);
  backdrop-filter: blur(12px);
  font-size: 14px;
  font-weight: 720;
}

.note-offline {
  top: 145px;
  left: 18px;
}

.note-dot {
  width: 9px;
  height: 9px;
  background: #1fca8c;
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(31, 202, 140, 0.12);
}

.note-bilingual {
  right: -5px;
  top: 308px;
  display: grid;
  gap: 0;
}

.note-bilingual strong {
  color: var(--blue-dark);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.proof-strip {
  position: relative;
  z-index: 6;
  margin-top: -36px;
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 16px 44px rgba(25, 65, 100, 0.09);
}

.proof-grid div {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 12px;
  padding: 23px 20px;
}

.proof-grid div + div {
  border-left: 1px solid var(--line);
}

.proof-grid strong {
  font-size: 18px;
}

.proof-grid span {
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 120px 0;
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 58px;
  text-align: center;
}

.section-kicker {
  margin-bottom: 13px;
}

.section-heading h2,
.download-copy h2 {
  margin-bottom: 20px;
  font-size: clamp(38px, 4.4vw, 58px);
  font-weight: 800;
}

.section-heading > p:last-child {
  max-width: 620px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 18px;
}

.features-section {
  background: #fff;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 18px;
}

.feature-card {
  grid-column: span 2;
  min-height: 275px;
  padding: 30px;
  background: var(--surface-soft);
  border: 1px solid #e3ebf3;
  border-radius: var(--radius-md);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: #c8dbea;
  box-shadow: 0 18px 42px rgba(25, 65, 100, 0.09);
}

.feature-card:nth-last-child(-n + 2) {
  grid-column: span 3;
}

.feature-card-primary {
  position: relative;
  grid-column: span 4;
  overflow: hidden;
  min-height: 348px;
  color: #fff;
  background:
    radial-gradient(circle at 92% 10%, rgba(49, 197, 232, 0.35), transparent 34%),
    linear-gradient(135deg, #0c315c 0%, #075b9d 100%);
  border-color: transparent;
}

.feature-card-primary::after {
  content: "AI";
  position: absolute;
  right: -6px;
  bottom: -48px;
  color: rgba(255, 255, 255, 0.06);
  font-size: 190px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.1em;
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  margin-bottom: 26px;
  color: var(--blue-dark);
  background: #fff;
  border: 1px solid #d9e5ef;
  border-radius: 15px;
  box-shadow: 0 9px 22px rgba(25, 65, 100, 0.08);
}

.feature-card-primary .feature-icon {
  color: #fff;
  background: rgba(255, 255, 255, 0.13);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: none;
}

.feature-icon svg {
  width: 25px;
  height: 25px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-label {
  display: inline-block;
  margin-bottom: 12px;
  color: #8cddf2;
  font-size: 13px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.feature-card h3 {
  margin-bottom: 13px;
  font-size: 25px;
}

.feature-card-primary h3 {
  position: relative;
  z-index: 1;
  max-width: 520px;
  font-size: clamp(30px, 3.1vw, 44px);
}

.feature-card p {
  position: relative;
  z-index: 1;
  max-width: 560px;
  margin-bottom: 0;
  color: var(--muted);
}

.feature-card-primary p {
  color: rgba(255, 255, 255, 0.75);
}

.speech-wave {
  position: absolute;
  z-index: 1;
  right: 34px;
  bottom: 34px;
  height: 55px;
  display: flex;
  align-items: center;
  gap: 7px;
}

.speech-wave span {
  width: 5px;
  height: 16px;
  background: rgba(132, 231, 250, 0.72);
  border-radius: 999px;
}

.speech-wave span:nth-child(2),
.speech-wave span:nth-child(8) { height: 29px; }
.speech-wave span:nth-child(3),
.speech-wave span:nth-child(7) { height: 43px; }
.speech-wave span:nth-child(4),
.speech-wave span:nth-child(6) { height: 34px; }
.speech-wave span:nth-child(5) { height: 54px; }

.screens-section {
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(circle at 16% 30%, rgba(31, 148, 204, 0.22), transparent 26%),
    radial-gradient(circle at 88% 70%, rgba(95, 78, 214, 0.19), transparent 28%),
    var(--navy);
}

.section-heading-light .section-kicker {
  color: #77d9f2;
}

.section-heading-light > p:last-child {
  color: rgba(255, 255, 255, 0.63);
}

.screen-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 40px;
  align-items: start;
}

.screen-card {
  display: grid;
  justify-items: center;
}

.screen-card-raised {
  padding-top: 72px;
}

.phone-gallery {
  width: min(100%, 270px);
  aspect-ratio: 9 / 20;
  border-width: 7px;
  border-radius: 40px;
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.3);
}

.phone-gallery::after {
  border-radius: 33px;
}

.screen-caption {
  width: min(100%, 270px);
  display: flex;
  gap: 14px;
  margin-top: 25px;
}

.screen-caption > span {
  color: #70d6f1;
  font-size: 12px;
  font-weight: 800;
}

.screen-caption h3 {
  margin: 0 0 4px;
  font-size: 19px;
  letter-spacing: -0.02em;
}

.screen-caption p {
  margin: 0;
  color: rgba(255, 255, 255, 0.56);
  font-size: 14px;
}

.scenarios-section {
  background: var(--surface-soft);
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.scenario {
  min-height: 190px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 27px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.scenario > span {
  color: #8ba0b4;
  font-size: 12px;
  font-weight: 800;
}

.scenario h3 {
  margin: 26px 0 8px;
  font-size: 23px;
}

.scenario p {
  margin: 0;
  color: var(--muted);
}

.download-section {
  background: #fff;
}

.download-card {
  position: relative;
  min-height: 470px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, 0.72fr);
  align-items: center;
  gap: 45px;
  overflow: hidden;
  padding: 62px 72px;
  color: #fff;
  background:
    radial-gradient(circle at 85% 20%, rgba(49, 197, 232, 0.25), transparent 30%),
    linear-gradient(135deg, #08172a 0%, #0d3158 62%, #096b9d 100%);
  border-radius: var(--radius-lg);
  box-shadow: 0 30px 80px rgba(10, 45, 80, 0.2);
}

.download-copy {
  position: relative;
  z-index: 2;
}

.download-copy .section-kicker {
  color: #7addf2;
}

.download-copy > p:not(.section-kicker):not(.install-note) {
  max-width: 620px;
  margin-bottom: 28px;
  color: rgba(255, 255, 255, 0.69);
  font-size: 18px;
}

.button-white {
  color: #0b355c;
  background: #fff;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.18);
}

.install-note {
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.5);
  font-size: 13px;
}

.download-art {
  position: relative;
  min-height: 330px;
  display: grid;
  place-items: center;
  align-self: end;
}

.download-art img {
  position: relative;
  z-index: 1;
  width: 340px;
  filter: drop-shadow(0 24px 34px rgba(0, 0, 0, 0.2));
}

.download-ring {
  position: absolute;
  width: 340px;
  height: 340px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 50%;
  box-shadow: 0 0 0 40px rgba(255, 255, 255, 0.025), 0 0 0 80px rgba(255, 255, 255, 0.018);
}

.site-footer {
  padding: 30px 0;
  border-top: 1px solid var(--line);
}

.footer-wrap {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}

.footer-wrap p {
  margin: 0;
  color: #7a8899;
  font-size: 13px;
}

.footer-legal {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 14px;
  color: #7a8899;
  font-size: 13px;
}

.footer-legal a {
  transition: color 180ms ease;
}

.footer-legal a:hover {
  color: var(--blue-dark);
}

.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms ease, transform 700ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .hero {
    min-height: auto;
    padding-bottom: 60px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .hero-copy {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
  }

  .hero-lead {
    margin-inline: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .download-meta {
    margin-left: 0;
  }

  .hero-visual {
    min-height: 650px;
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
  }

  .feature-card,
  .feature-card:nth-last-child(-n + 2) {
    grid-column: span 3;
  }

  .feature-card-primary {
    grid-column: 1 / -1;
  }

  .download-card {
    grid-template-columns: 1fr 280px;
    padding: 54px 48px;
  }

  .download-art img,
  .download-ring {
    width: 290px;
    height: 290px;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 32px, 620px);
  }

  .nav-wrap {
    min-height: 68px;
  }

  .nav-links > a:not(.button) {
    display: none;
  }

  .button-small {
    min-height: 40px;
    padding-inline: 15px;
    font-size: 13px;
  }

  .hero {
    padding-top: 112px;
  }

  .hero h1 {
    font-size: clamp(46px, 14vw, 64px);
  }

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

  .hero-visual {
    min-height: 575px;
  }

  .visual-halo {
    width: 420px;
    height: 420px;
  }

  .phone-hero {
    width: 252px;
  }

  .hero-robot {
    right: 0;
    width: 160px;
  }

  .note-offline {
    left: 0;
  }

  .note-bilingual {
    right: 0;
  }

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

  .proof-grid div {
    justify-content: flex-start;
    padding: 17px 22px;
  }

  .proof-grid div + div {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .section {
    padding: 88px 0;
  }

  .section-heading {
    margin-bottom: 42px;
  }

  .section-heading h2,
  .download-copy h2 {
    font-size: clamp(34px, 10vw, 48px);
  }

  .section-heading > p:last-child {
    font-size: 16px;
  }

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

  .feature-card,
  .feature-card:nth-last-child(-n + 2),
  .feature-card-primary {
    grid-column: 1;
    min-height: auto;
  }

  .feature-card-primary {
    min-height: 390px;
  }

  .speech-wave {
    left: 30px;
    right: auto;
  }

  .screen-grid {
    grid-template-columns: 1fr;
    gap: 62px;
  }

  .screen-card-raised {
    padding-top: 0;
  }

  .phone-gallery,
  .screen-caption {
    width: min(100%, 280px);
  }

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

  .scenario {
    min-height: 165px;
  }

  .download-card {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 42px 28px 0;
    text-align: center;
    border-radius: 25px;
  }

  .download-copy > p:not(.section-kicker):not(.install-note) {
    font-size: 16px;
  }

  .download-art {
    min-height: 270px;
  }

  .download-art img,
  .download-ring {
    width: 260px;
    height: 260px;
  }

  .footer-wrap {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .footer-legal {
    justify-self: center;
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 460px) {
  .brand span {
    font-size: 15px;
  }

  .nav-links {
    gap: 0;
  }

  .hero-actions {
    display: grid;
  }

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

  .hero-visual {
    min-height: 510px;
  }

  .visual-halo {
    width: 340px;
    height: 340px;
  }

  .phone-hero {
    width: 220px;
  }

  .hero-robot {
    width: 128px;
  }

  .floating-note {
    padding: 9px 12px;
    font-size: 12px;
  }

  .note-offline {
    top: 120px;
  }

  .note-bilingual {
    top: 285px;
  }

  .download-card .button {
    width: 100%;
    padding-inline: 16px;
    font-size: 14px;
  }
}

@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;
  }
}