:root {
  color-scheme: light dark;
  --page: #f2f3f2;
  --surface: #e7e9e8;
  --surface-strong: #dadddc;
  --ink: #181b1d;
  --ink-soft: #555d61;
  --line: rgba(24, 27, 29, 0.16);
  --accent: #c5484c;
  --accent-deep: #923238;
  --accent-ink: #fff8f7;
  --header: rgba(242, 243, 242, 0.86);
  --shadow: 0 28px 80px rgba(51, 58, 61, 0.14);
  --media-radius: 20px;
  --button-radius: 999px;
  --shell: min(1280px, calc(100% - 48px));
  --font-sans: "MiSans", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #151719;
    --surface: #1d2022;
    --surface-strong: #282c2f;
    --ink: #f0f2f1;
    --ink-soft: #adb4b6;
    --line: rgba(240, 242, 241, 0.15);
    --accent: #d85b5d;
    --accent-deep: #ef7778;
    --accent-ink: #1a0c0d;
    --header: rgba(21, 23, 25, 0.86);
    --shadow: 0 28px 80px rgba(0, 0, 0, 0.28);
  }
}

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

html {
  scroll-behavior: smooth;
  background: var(--page);
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  object-fit: cover;
}

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

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

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 72%, white);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  transform: translateY(-160%);
  border-radius: var(--button-radius);
  background: var(--ink);
  color: var(--page);
  padding: 10px 16px;
  transition: transform 180ms ease;
}

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

.section-shell,
.nav-shell,
.footer-shell {
  width: var(--shell);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: var(--header);
  backdrop-filter: blur(18px) saturate(130%);
  -webkit-backdrop-filter: blur(18px) saturate(130%);
}

.nav-shell {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.wordmark {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: baseline;
  gap: 11px;
  line-height: 1;
}

.wordmark-en {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.045em;
}

.wordmark-cn {
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 650;
}

.primary-navigation {
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 38px);
  white-space: nowrap;
}

.primary-navigation a,
.footer-links a {
  color: var(--ink-soft);
  font-size: 14px;
  transition: color 180ms ease;
}

.primary-navigation a:hover,
.footer-links a:hover {
  color: var(--accent-deep);
}

.menu-button {
  display: none;
  border: 1px solid var(--line);
  border-radius: var(--button-radius);
  background: transparent;
  color: var(--ink);
  padding: 8px 14px;
}

.hero {
  display: grid;
  min-height: calc(100dvh - 72px);
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  align-items: start;
  gap: clamp(36px, 4vw, 64px);
  padding-block: clamp(44px, 7vw, 88px);
}

.hero-copy {
  position: relative;
  z-index: 1;
  padding-top: clamp(28px, 7vw, 92px);
}

.eyebrow {
  width: fit-content;
  margin: 0 0 24px;
  border: 1px solid var(--line);
  border-radius: var(--button-radius);
  color: var(--accent-deep);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.12em;
  padding: 7px 12px;
}

.hero h1,
.manifesto h2,
.section-heading h2,
.story-copy h2,
.trust h2,
.download h2,
.legal-page h1 {
  margin: 0;
  font-weight: 760;
  letter-spacing: -0.055em;
  line-height: 1.06;
}

.hero h1 {
  max-width: 9ch;
  font-size: clamp(46px, 5.2vw, 72px);
}

.hero-summary {
  max-width: 32rem;
  margin: 30px 0 0;
  color: var(--ink-soft);
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--button-radius);
  padding: 0 22px;
  font-size: 15px;
  font-weight: 750;
  white-space: nowrap;
  transition: transform 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

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

.button:active {
  transform: translateY(1px) scale(0.98);
}

.button-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.button-primary:hover {
  background: var(--accent-deep);
}

.button-secondary {
  border-color: var(--line);
  background: color-mix(in srgb, var(--page) 82%, transparent);
  color: var(--ink);
}

.hero-media {
  position: relative;
  margin: 0;
}

.hero-media::before {
  content: "";
  position: absolute;
  inset: -18px 18px 18px -18px;
  z-index: -1;
  border: 1px solid color-mix(in srgb, var(--accent) 48%, transparent);
  border-radius: var(--media-radius);
}

.hero-media img {
  width: 100%;
  min-height: min(70dvh, 760px);
  border-radius: var(--media-radius);
  box-shadow: var(--shadow);
  object-position: 68% center;
}

.hero-media figcaption {
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 12px;
}

.manifesto {
  padding-block: clamp(96px, 14vw, 190px);
}

.manifesto-lead {
  margin: 0 0 20px;
  color: var(--accent-deep);
  font-size: 16px;
  font-weight: 750;
}

.manifesto h2 {
  max-width: 14ch;
  font-size: clamp(40px, 6vw, 80px);
}

.manifesto > p:last-child {
  max-width: 42rem;
  margin: 30px 0 0 clamp(0px, 18vw, 240px);
  color: var(--ink-soft);
  font-size: clamp(17px, 1.7vw, 22px);
}

.role-story {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(270px, 0.75fr);
  grid-template-areas:
    "wide copy"
    "wide tall";
  align-items: end;
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(110px, 14vw, 180px);
}

.story-image img {
  width: 100%;
  border-radius: var(--media-radius);
}

.story-image-wide {
  grid-area: wide;
}

.story-image-wide img {
  height: min(78dvh, 940px);
}

.story-image-tall {
  grid-area: tall;
}

.story-image-tall img {
  aspect-ratio: 4 / 5;
}

.story-copy {
  grid-area: copy;
  align-self: start;
  padding-top: clamp(10px, 5vw, 70px);
}

.story-copy h2,
.section-heading h2,
.trust h2,
.download h2 {
  font-size: clamp(34px, 4.8vw, 64px);
}

.story-copy > p,
.section-heading p,
.trust-copy p,
.download-copy p {
  max-width: 38rem;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: 17px;
}

.role-index {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 30px;
}

.role-index span {
  border: 1px solid var(--line);
  border-radius: var(--button-radius);
  padding: 6px 11px;
  color: var(--ink-soft);
  font-size: 13px;
}

.capabilities {
  padding-block: clamp(84px, 11vw, 150px);
}

.section-heading {
  max-width: 52rem;
  margin-bottom: clamp(48px, 7vw, 84px);
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 18px;
}

.capability {
  grid-column: span 5;
  min-height: 310px;
  border-radius: var(--media-radius);
  background: var(--surface);
  padding: clamp(26px, 3vw, 42px);
}

.capability:nth-child(2) {
  grid-column: span 5;
  margin-top: 74px;
}

.capability:nth-child(4) {
  grid-column: 7 / span 6;
  margin-top: -34px;
}

.capability-featured {
  grid-column: span 7;
  min-height: 390px;
  background: var(--ink);
  color: var(--page);
}

.capability-accent {
  grid-column: span 6;
  background: var(--accent);
  color: var(--accent-ink);
}

.capability-number {
  display: block;
  margin-bottom: clamp(60px, 8vw, 116px);
  color: currentColor;
  font-size: 13px;
  font-weight: 800;
  opacity: 0.68;
}

.capability h3 {
  margin: 0;
  font-size: clamp(27px, 3vw, 40px);
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.capability p {
  max-width: 31rem;
  margin: 18px 0 0;
  color: currentColor;
  font-size: 16px;
  opacity: 0.76;
}

.trust {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.8fr);
  gap: clamp(54px, 10vw, 150px);
  align-items: start;
  padding-block: clamp(100px, 13vw, 170px);
}

.trust-points {
  margin: 0;
}

.trust-points div {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  padding: 24px 0;
}

.trust-points div:first-child {
  padding-top: 0;
}

.trust-points dt {
  color: var(--accent-deep);
  font-weight: 800;
}

.trust-points dd {
  margin: 0;
  color: var(--ink-soft);
}

.download {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: clamp(44px, 9vw, 130px);
  align-items: start;
  margin-bottom: clamp(84px, 10vw, 140px);
  border-radius: var(--media-radius);
  background: var(--surface);
  padding: clamp(32px, 6vw, 80px);
}

.download-options {
  display: grid;
  gap: 12px;
}

.download-option {
  display: grid;
  grid-template-columns: minmax(90px, 0.5fr) 1fr;
  align-items: center;
  min-height: 112px;
  border: 1px solid var(--line);
  border-radius: var(--media-radius);
  background: var(--page);
  padding: 20px 24px;
  transition: transform 180ms ease, border-color 180ms ease;
}

.download-option:not([aria-disabled="true"]):hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.download-option[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.72;
}

.download-platform {
  grid-row: 1 / span 2;
  color: var(--accent-deep);
  font-size: 13px;
  font-weight: 800;
}

.download-option strong {
  font-size: 22px;
  letter-spacing: -0.025em;
}

.download-option small {
  color: var(--ink-soft);
  font-size: 12px;
}

.download-note {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 56px 38px;
}

.footer-shell {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr auto;
  gap: 50px;
  align-items: start;
}

.footer-wordmark {
  margin-bottom: 16px;
}

.footer-shell p {
  max-width: 30rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.footer-links {
  display: grid;
  gap: 11px;
}

.footer-meta {
  display: grid;
  justify-items: end;
  gap: 8px;
  text-align: right;
}

.footer-meta a {
  color: var(--ink-soft);
  font-size: 13px;
}

.legal-page {
  width: min(780px, calc(100% - 40px));
  min-height: 70dvh;
  margin-inline: auto;
  padding-block: clamp(64px, 9vw, 120px);
}

.legal-page h1 {
  font-size: clamp(42px, 7vw, 72px);
}

.legal-page .legal-intro {
  margin: 24px 0 60px;
  color: var(--ink-soft);
  font-size: 18px;
}

.legal-page section {
  margin-top: 46px;
}

.legal-page h2 {
  margin: 0 0 14px;
  font-size: 23px;
  letter-spacing: -0.02em;
}

.legal-page p,
.legal-page li {
  color: var(--ink-soft);
}

.legal-page ul {
  padding-left: 1.2em;
}

.legal-back {
  display: inline-flex;
  margin-bottom: 40px;
  color: var(--accent-deep);
  font-weight: 750;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
}

.reveal[data-visible] {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 680ms cubic-bezier(0.16, 1, 0.3, 1), transform 680ms cubic-bezier(0.16, 1, 0.3, 1);
}

@media (max-width: 900px) {
  :root {
    --shell: min(100% - 32px, 720px);
  }

  .menu-button {
    display: inline-flex;
  }

  .primary-navigation {
    position: absolute;
    top: 72px;
    right: 16px;
    left: 16px;
    display: none;
    align-items: stretch;
    border: 1px solid var(--line);
    border-radius: var(--media-radius);
    background: var(--page);
    box-shadow: var(--shadow);
    padding: 12px;
  }

  .primary-navigation[data-open] {
    display: grid;
  }

  .primary-navigation.legal-navigation {
    position: static;
    display: flex;
    width: auto;
    border: 0;
    background: transparent;
    box-shadow: none;
    padding: 0;
  }

  .primary-navigation a {
    border-radius: 12px;
    padding: 12px 14px;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 52px;
    padding-block: 64px 90px;
  }

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

  .hero h1 {
    max-width: 10ch;
  }

  .hero-media img {
    min-height: 62dvh;
  }

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

  .role-story {
    grid-template-columns: 1fr;
    grid-template-areas:
      "copy"
      "wide"
      "tall";
  }

  .story-copy {
    padding-top: 0;
  }

  .story-image-wide img {
    height: auto;
    aspect-ratio: 4 / 3;
  }

  .story-image-tall {
    width: min(78%, 520px);
    margin-left: auto;
  }

  .capability,
  .capability-featured,
  .capability-accent,
  .capability:nth-child(2),
  .capability:nth-child(4) {
    grid-column: 1 / -1;
    min-height: 290px;
    margin-top: 0;
  }

  .capability-featured {
    min-height: 360px;
  }

  .trust,
  .download {
    grid-template-columns: 1fr;
  }

  .download {
    gap: 48px;
  }

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

  .footer-meta {
    grid-column: 1 / -1;
    justify-items: start;
    text-align: left;
  }
}

@media (max-width: 560px) {
  :root {
    --shell: calc(100% - 28px);
    --media-radius: 16px;
  }

  .nav-shell {
    min-height: 64px;
  }

  .primary-navigation {
    top: 64px;
  }

  .hero {
    padding-block: 46px 72px;
  }

  .hero h1 {
    font-size: clamp(42px, 13vw, 62px);
  }

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

  .hero-media::before {
    inset: -10px 10px 10px -10px;
  }

  .hero-media img {
    min-height: 480px;
  }

  .manifesto,
  .capabilities,
  .trust {
    padding-block: 84px;
  }

  .story-image-tall {
    width: 88%;
  }

  .capability-grid {
    gap: 12px;
  }

  .trust-points div {
    grid-template-columns: 72px 1fr;
  }

  .download {
    width: calc(100% - 28px);
    padding: 28px 20px;
  }

  .download-option {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .download-platform {
    grid-row: auto;
  }

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

  .footer-meta {
    grid-column: auto;
  }
}

@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;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--page);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}