:root {
  --bg: #ffffff;
  --surface: #f6f7f8;
  --surface-strong: #ffffff;
  --text: #111113;
  --muted: #60646c;
  --subtle: #8b8d98;
  --border: #e4e4e7;
  --primary: #111113;
  --primary-text: #ffffff;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --green: #047857;
  --green-soft: #d1fae5;
  --orange: #b45309;
  --orange-soft: #ffedd5;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
  --radius: 12px;
  --container: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #070708;
    --surface: #111113;
    --surface-strong: #18181b;
    --text: #fafafa;
    --muted: #a1a1aa;
    --subtle: #71717a;
    --border: #27272a;
    --primary: #fafafa;
    --primary-text: #111113;
    --accent: #60a5fa;
    --accent-soft: rgba(96, 165, 250, 0.16);
    --green: #34d399;
    --green-soft: rgba(52, 211, 153, 0.16);
    --orange: #fbbf24;
    --orange-soft: rgba(251, 191, 36, 0.16);
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.32);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 12%, rgba(37, 99, 235, 0.08), transparent 28rem),
    radial-gradient(circle at 82% 18%, rgba(4, 120, 87, 0.08), transparent 26rem),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

button {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(228, 228, 231, 0.7);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(18px);
}

@media (prefers-color-scheme: dark) {
  .site-header {
    border-bottom-color: rgba(39, 39, 42, 0.76);
  }
}

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

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

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  gap: 12px;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-strong);
  box-shadow: 0 8px 26px rgba(15, 23, 42, 0.08);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a,
.language-switch button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 999px;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease;
}

.nav-links a {
  padding: 0 14px;
}

.nav-links a:hover {
  color: var(--text);
  background: var(--surface);
}

.language-switch {
  display: inline-flex;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-strong);
}

.language-switch button {
  min-width: 38px;
  min-height: 38px;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.86rem;
  font-weight: 700;
}

.language-switch button[aria-pressed="true"] {
  background: var(--primary);
  color: var(--primary-text);
}

html[data-lang="zh"] .language-switch button[data-lang-option="zh"],
html[data-lang="en"] .language-switch button[data-lang-option="en"] {
  background: var(--primary);
  color: var(--primary-text);
}

html[data-lang="zh"] .language-switch button[data-lang-option="en"],
html[data-lang="en"] .language-switch button[data-lang-option="zh"] {
  background: transparent;
  color: var(--muted);
}

.hero {
  display: grid;
  min-height: 560px;
  place-items: center;
  padding: 100px 0 72px;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 24px;
  padding: 8px 13px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: var(--surface-strong);
  font-size: 0.86rem;
  font-weight: 600;
}

.eyebrow svg {
  color: var(--accent);
}

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

h1 {
  max-width: 820px;
  margin-inline: auto;
  margin-bottom: 22px;
  font-size: clamp(3.2rem, 8vw, 6.4rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 660px;
  margin: 0 auto 34px;
  color: var(--muted);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  gap: 10px;
  padding: 0 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--text);
  font-weight: 700;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: var(--primary-text);
}

.button:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--text) 28%, var(--border));
}

.section {
  padding: 68px 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin-bottom: 10px;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.section-heading p {
  max-width: 680px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.7vw, 1.18rem);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.product-card {
  position: relative;
  display: flex;
  min-height: 340px;
  flex-direction: column;
  overflow: hidden;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-strong);
  box-shadow: var(--shadow);
  transition: transform 220ms ease, border-color 220ms ease;
}

.product-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 38%, var(--border));
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 26px;
}

.app-icon {
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  border-radius: 16px;
  color: var(--icon-color);
  background: var(--icon-bg);
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border-radius: 999px;
  color: var(--muted);
  background: var(--surface);
  font-size: 0.78rem;
  font-weight: 700;
}

.product-card h3 {
  margin-bottom: 8px;
  font-size: 1.55rem;
  line-height: 1.2;
  letter-spacing: 0;
}

.product-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.feature-list {
  display: grid;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  color: var(--muted);
  list-style: none;
  font-size: 0.95rem;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-list svg {
  flex: 0 0 auto;
  color: var(--accent);
}

.card-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  gap: 8px;
  margin-top: auto;
  padding-top: 26px;
  color: var(--text);
  font-weight: 700;
}

.card-link svg {
  transition: transform 180ms ease;
}

.product-card:hover .card-link svg {
  transform: translateX(3px);
}

.studio-note {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 28px;
  margin-top: 20px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.studio-note p {
  margin-bottom: 0;
  color: var(--muted);
}

.legal-hero {
  padding: 86px 0 34px;
}

.legal-hero h1 {
  margin-inline: 0;
  font-size: clamp(2.6rem, 6vw, 5.2rem);
}

.legal-hero p {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.1rem;
}

.legal-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 44px;
  padding: 32px 0 72px;
}

.legal-toc {
  position: sticky;
  top: 100px;
  align-self: start;
  display: grid;
  gap: 8px;
}

.legal-toc a {
  display: flex;
  align-items: center;
  min-height: 38px;
  padding: 0 12px;
  border-radius: 10px;
  color: var(--muted);
  font-size: 0.94rem;
}

.legal-toc a:hover {
  color: var(--text);
  background: var(--surface);
}

.legal-content {
  display: grid;
  gap: 18px;
}

.legal-card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-strong);
}

.legal-card h2 {
  margin-bottom: 10px;
  font-size: 1.35rem;
}

.legal-card p,
.legal-card li {
  color: var(--muted);
}

.legal-card p:last-child {
  margin-bottom: 0;
}

.legal-card ul {
  margin-bottom: 0;
  padding-left: 1.2rem;
}

.contact-hero {
  padding: 86px 0 28px;
}

.contact-hero h1 {
  margin-inline: 0;
  font-size: clamp(2.8rem, 7vw, 5.6rem);
}

.contact-hero p {
  max-width: 860px;
  color: var(--muted);
  font-size: 1.12rem;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
  gap: 18px;
  padding: 24px 0 20px;
}

.contact-panel,
.contact-card,
.contact-followup {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-strong);
  box-shadow: var(--shadow);
}

.contact-panel {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 20px;
  padding: 28px;
}

.contact-icon {
  display: grid;
  width: 62px;
  height: 62px;
  place-items: center;
  border-radius: 18px;
  color: var(--accent);
  background: var(--accent-soft);
}

.contact-label {
  margin-bottom: 8px;
  color: var(--subtle);
  font-size: 0.86rem;
  font-weight: 700;
}

.contact-email {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--text);
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-weight: 800;
  line-height: 1.2;
  word-break: break-word;
}

.contact-email:hover {
  color: var(--accent);
}

.contact-copy {
  max-width: 620px;
  margin: 14px 0 0;
  color: var(--muted);
}

.contact-action {
  grid-column: 2;
  width: fit-content;
  margin-top: 4px;
}

.contact-card {
  padding: 28px;
}

.contact-card h2,
.contact-followup h2 {
  margin-bottom: 16px;
  font-size: 1.35rem;
}

.contact-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
}

.contact-list li {
  display: flex;
  gap: 10px;
}

.contact-list svg {
  flex: 0 0 auto;
  margin-top: 4px;
  color: var(--accent);
}

.contact-followup {
  margin-bottom: 72px;
  padding: 28px;
}

.contact-followup p {
  max-width: 860px;
  margin-bottom: 22px;
  color: var(--muted);
}

.footer {
  padding: 60px 0 44px;
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 36px;
}

.footer h2,
.footer h3 {
  margin-bottom: 14px;
  font-size: 1rem;
}

.footer p,
.footer a {
  color: var(--muted);
  font-size: 0.95rem;
}

.footer ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  transition: color 180ms ease;
}

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

.copyright {
  margin-top: 44px;
  color: var(--subtle);
  font-size: 0.9rem;
  text-align: center;
}

.reveal {
  animation: fade-in 480ms ease both;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

@media (max-width: 900px) {
  .product-grid,
  .footer-grid,
  .studio-note,
  .legal-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .legal-toc {
    position: static;
  }

  .contact-panel {
    grid-template-columns: 1fr;
  }

  .contact-action {
    grid-column: auto;
  }
}

@media (max-width: 720px) {
  .nav {
    display: grid;
    grid-template-columns: 1fr auto;
    padding: 14px 0;
    gap: 10px;
  }

  .nav-actions {
    display: contents;
  }

  .nav-links {
    grid-column: 1 / -1;
    order: 2;
    width: 100%;
    justify-content: space-between;
  }

  .language-switch {
    order: 1;
    width: auto;
    padding: 1px;
  }

  .language-switch button {
    min-width: 34px;
    min-height: 34px;
    font-size: 0.78rem;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 28px, var(--container));
  }

  .nav-links a {
    padding: 0 9px;
    font-size: 0.9rem;
  }

  .hero {
    min-height: auto;
    padding: 74px 0 50px;
  }

  h1 {
    font-size: clamp(3rem, 18vw, 4.7rem);
  }

  .actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .section {
    padding: 48px 0;
  }

  .product-card {
    min-height: 320px;
    padding: 20px;
  }
}