:root {
  color-scheme: light;
  --ink: #121827;
  --ink-soft: #4f5b70;
  --muted: #718096;
  --line: #dfe5ee;
  --line-strong: #cdd6e4;
  --surface: #ffffff;
  --surface-soft: #f5f7fb;
  --surface-blue: #eef4ff;
  --blue: #3677f5;
  --blue-dark: #1d56c8;
  --green: #218c6a;
  --green-soft: #e9f7f1;
  --amber: #a66416;
  --amber-soft: #fff4df;
  --shadow-sm: 0 12px 32px rgba(26, 42, 72, 0.08);
  --shadow-lg: 0 28px 80px rgba(26, 42, 72, 0.14);
  --radius-sm: 14px;
  --radius-md: 22px;
  --radius-lg: 30px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "PingFang TC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

:focus-visible {
  outline: 3px solid rgba(54, 119, 245, 0.35);
  outline-offset: 3px;
}

.container {
  width: min(calc(100% - 40px), var(--container));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid rgba(205, 214, 228, 0.76);
  backdrop-filter: blur(18px) saturate(1.25);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 20px;
  font-weight: 760;
  letter-spacing: -0.03em;
}

.brand img {
  width: 36px;
  height: 36px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  padding: 10px 12px;
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 620;
  border-radius: 10px;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--surface-soft);
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.language-picker {
  display: inline-flex;
  align-items: center;
  margin: 0 4px;
}

.language-select {
  min-width: 116px;
  height: 38px;
  padding: 0 34px 0 12px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 620;
  border: 1px solid var(--line);
  border-radius: 10px;
  background-color: var(--surface);
  cursor: pointer;
}

.nav-cta {
  color: #fff !important;
  background: var(--ink) !important;
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}

.menu-button span,
.menu-button::before,
.menu-button::after {
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--ink);
  content: "";
  transition: transform 160ms ease, opacity 160ms ease;
}

.menu-button {
  flex-direction: column;
  gap: 4px;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 72px;
  background:
    radial-gradient(circle at 86% 12%, rgba(54, 119, 245, 0.14), transparent 35%),
    linear-gradient(180deg, #fbfdff 0%, #fff 76%);
}

.hero::after {
  position: absolute;
  inset: auto -18% -260px;
  height: 420px;
  border-radius: 50%;
  background: rgba(54, 119, 245, 0.04);
  content: "";
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(520px, 1.05fr);
  align-items: center;
  gap: 48px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  color: var(--blue-dark);
  font-size: 14px;
  font-weight: 720;
  letter-spacing: 0.02em;
}

.eyebrow::before {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 6px rgba(54, 119, 245, 0.1);
  content: "";
}

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

h1 {
  margin-bottom: 24px;
  max-width: 650px;
  font-size: clamp(48px, 6vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.065em;
}

.hero-lead {
  max-width: 570px;
  margin-bottom: 30px;
  color: var(--ink-soft);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.72;
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 13px;
  font-size: 15px;
  font-weight: 700;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: #fff;
  background: var(--blue);
  box-shadow: 0 11px 24px rgba(54, 119, 245, 0.24);
}

.button-primary:hover {
  background: var(--blue-dark);
}

.button-secondary {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.78);
}

.button-dark {
  color: #fff;
  background: var(--ink);
}

.hero-note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.app-window {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  transform: perspective(1200px) rotateY(-2.5deg) rotateX(1deg);
}

.window-bar {
  height: 38px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 14px;
  border-bottom: 1px solid var(--line);
  background: #f7f8fa;
}

.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.window-dot:nth-child(1) { background: #ff605c; }
.window-dot:nth-child(2) { background: #ffbd44; }
.window-dot:nth-child(3) { background: #00ca4e; }

.app-window img {
  width: 100%;
  height: auto;
  aspect-ratio: 1.36;
  object-fit: cover;
  object-position: center top;
}

.signal-strip {
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface-soft);
}

.signal-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.signal {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 650;
}

.signal-mark {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  color: var(--green);
  background: var(--green-soft);
  font-size: 14px;
  font-weight: 800;
}

.section {
  padding: 100px 0;
}

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

.section-flush-bottom {
  padding-bottom: 0;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 46px;
}

.section-heading.centered {
  margin-inline: auto;
  text-align: center;
}

.section-heading h2,
.page-hero h1 {
  margin-bottom: 18px;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.05em;
}

.section-heading p,
.page-hero p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.72;
}

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

.feature-card {
  min-height: 230px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.feature-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 25px;
  border-radius: 13px;
  color: var(--blue-dark);
  background: var(--surface-blue);
  font-size: 18px;
  font-weight: 800;
}

.feature-card h3 {
  margin-bottom: 11px;
  font-size: 20px;
  letter-spacing: -0.025em;
}

.feature-card p {
  margin-bottom: 0;
  color: var(--ink-soft);
  line-height: 1.7;
}

.showcase {
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  align-items: center;
  gap: 68px;
  margin-top: 78px;
}

.showcase.reverse {
  grid-template-columns: 1.22fr 0.78fr;
}

.showcase-copy {
  max-width: 470px;
}

.showcase-copy h3 {
  margin-bottom: 16px;
  font-size: 32px;
  letter-spacing: -0.04em;
}

.showcase-copy p {
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.75;
}

.check-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  margin: 12px 0;
  padding-left: 28px;
  color: var(--ink-soft);
  line-height: 1.55;
}

.check-list li::before {
  position: absolute;
  left: 0;
  top: 0.17em;
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--green);
  background: var(--green-soft);
  content: "✓";
  font-size: 11px;
  font-weight: 800;
}

.screen-frame {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: #eef0f3;
  box-shadow: var(--shadow-sm);
}

.screen-frame img {
  width: 100%;
  height: auto;
  aspect-ratio: 1.36;
  object-fit: cover;
  object-position: center top;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
}

.step {
  position: relative;
  padding: 34px;
}

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

.step-number {
  display: block;
  margin-bottom: 40px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.step h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

.step p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.7;
}

.privacy-panel {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  align-items: center;
  gap: 70px;
  padding: 52px;
  border: 1px solid #cce5db;
  border-radius: var(--radius-lg);
  background: var(--green-soft);
}

.privacy-panel h2 {
  margin-bottom: 16px;
  font-size: clamp(34px, 4vw, 48px);
  letter-spacing: -0.045em;
}

.privacy-panel p {
  margin-bottom: 0;
  color: #3d6558;
  font-size: 17px;
  line-height: 1.75;
}

.privacy-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.privacy-fact {
  padding: 20px;
  border: 1px solid rgba(33, 140, 106, 0.18);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
}

.privacy-fact strong,
.privacy-fact span {
  display: block;
}

.privacy-fact strong {
  margin-bottom: 5px;
  font-size: 20px;
}

.privacy-fact span {
  color: #54766b;
  font-size: 13px;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.platform-card {
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.platform-card.current {
  border-color: rgba(54, 119, 245, 0.35);
  background: var(--surface-blue);
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  margin-bottom: 32px;
  padding: 0 10px;
  border-radius: 999px;
  color: var(--blue-dark);
  background: #fff;
  font-size: 12px;
  font-weight: 750;
}

.platform-card h3 {
  margin-bottom: 12px;
  font-size: 28px;
}

.platform-card p {
  min-height: 58px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.faq-list {
  max-width: 880px;
  margin-inline: auto;
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  position: relative;
  padding: 24px 42px 24px 0;
  cursor: pointer;
  font-size: 18px;
  font-weight: 690;
  list-style: none;
}

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

.faq-list summary::after {
  position: absolute;
  right: 4px;
  top: 22px;
  color: var(--muted);
  content: "+";
  font-size: 25px;
  font-weight: 400;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details p {
  max-width: 760px;
  margin: -5px 0 24px;
  color: var(--ink-soft);
  line-height: 1.72;
}

.cta-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  padding: 48px;
  border-radius: var(--radius-lg);
  color: #fff;
  background: var(--ink);
}

.cta-panel h2 {
  margin-bottom: 8px;
  font-size: clamp(30px, 4vw, 44px);
  letter-spacing: -0.045em;
}

.cta-panel p {
  margin-bottom: 0;
  color: #b8c1d0;
  font-size: 16px;
}

.cta-panel .button-primary {
  flex: 0 0 auto;
  box-shadow: none;
}

.site-footer {
  padding: 64px 0 34px;
  border-top: 1px solid var(--line);
  background: var(--surface-soft);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 0.6fr);
  gap: 42px;
}

.footer-brand p {
  max-width: 360px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.footer-group h3 {
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-group a {
  display: block;
  margin: 12px 0;
  color: var(--ink-soft);
  font-size: 14px;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

.page-hero {
  padding: 90px 0 62px;
  background: linear-gradient(180deg, #f8fbff, #fff);
}

.page-hero .container {
  max-width: 930px;
}

.page-content {
  max-width: 930px;
  padding-top: 68px;
  padding-bottom: 100px;
}

.content-card {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.content-card + .content-card,
.prose section + section {
  margin-top: 22px;
}

.content-card h2,
.prose h2 {
  margin-bottom: 14px;
  font-size: 25px;
  letter-spacing: -0.03em;
}

.content-card p,
.content-card li,
.prose p,
.prose li {
  color: var(--ink-soft);
  line-height: 1.8;
}

.content-card ul,
.prose ul,
.prose ol {
  padding-left: 22px;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 22px;
  color: var(--muted);
  font-size: 13px;
}

.download-card {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 34px;
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.download-card + .download-card {
  margin-top: 18px;
}

.download-card.primary {
  border-color: rgba(54, 119, 245, 0.36);
  background: var(--surface-blue);
}

.download-card h2 {
  margin-bottom: 10px;
  font-size: 28px;
}

.download-card p {
  margin-bottom: 0;
  color: var(--ink-soft);
  line-height: 1.7;
}

.download-status {
  min-width: 130px;
  text-align: right;
}

.download-status strong,
.download-status span {
  display: block;
}

.download-status strong {
  margin-bottom: 6px;
  color: var(--blue-dark);
}

.download-status span {
  color: var(--muted);
  font-size: 13px;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.support-card {
  min-height: 190px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.support-card h2 {
  font-size: 21px;
}

.support-card p {
  color: var(--ink-soft);
  line-height: 1.7;
}

.text-link {
  color: var(--blue-dark);
  font-weight: 700;
}

.timeline {
  position: relative;
  margin-left: 8px;
  padding-left: 32px;
  border-left: 2px solid var(--line);
}

.timeline-item {
  position: relative;
  padding: 0 0 48px;
}

.timeline-item::before {
  position: absolute;
  left: -40px;
  top: 3px;
  width: 14px;
  height: 14px;
  border: 3px solid #fff;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 1px var(--blue);
  content: "";
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item time {
  color: var(--muted);
  font-size: 13px;
}

.timeline-item h2 {
  margin: 8px 0 12px;
  font-size: 24px;
}

.timeline-item p,
.timeline-item li {
  color: var(--ink-soft);
  line-height: 1.75;
}

.not-found {
  min-height: calc(100vh - 73px);
  display: grid;
  place-items: center;
  padding: 60px 20px;
  text-align: center;
}

.not-found h1 {
  font-size: clamp(60px, 14vw, 120px);
  color: var(--blue);
}

@media (max-width: 1080px) {
  .hero-grid,
  .showcase,
  .showcase.reverse,
  .privacy-panel {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 48px;
  }

  .app-window {
    transform: none;
  }

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

  .showcase.reverse .screen-frame {
    order: 2;
  }

  .showcase.reverse .showcase-copy {
    order: 1;
  }

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

@media (max-width: 820px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

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

  .menu-button {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: 64px 0 auto;
    display: none;
    padding: 14px;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
  }

  .site-nav.open {
    display: grid;
  }

  .site-nav a {
    padding: 13px 14px;
  }

  .language-picker {
    width: 100%;
    margin: 4px 0;
  }

  .language-select {
    width: 100%;
    height: 44px;
    font-size: 15px;
  }

  .hero {
    padding: 62px 0 52px;
  }

  .hero-grid {
    display: block;
  }

  .app-window {
    margin-top: 46px;
  }

  h1 {
    font-size: clamp(44px, 14vw, 62px);
  }

  .signal-list,
  .feature-grid,
  .steps,
  .privacy-facts,
  .platform-grid,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .signal-list {
    gap: 13px;
  }

  .section {
    padding: 72px 0;
  }

  .section-heading {
    margin-bottom: 34px;
  }

  .showcase {
    gap: 28px;
    margin-top: 54px;
  }

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

  .step-number {
    margin-bottom: 20px;
  }

  .privacy-panel {
    gap: 34px;
    padding: 30px;
  }

  .cta-panel {
    display: block;
    padding: 32px;
  }

  .cta-actions {
    margin-top: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 34px 18px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    display: block;
  }

  .footer-bottom span {
    display: block;
    margin-top: 8px;
  }

  .page-hero {
    padding: 62px 0 44px;
  }

  .page-content {
    padding-top: 44px;
    padding-bottom: 72px;
  }

  .content-card,
  .download-card {
    padding: 26px;
  }

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

  .download-status {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}