:root {
  --color-primary: #2563EB;
  --color-on-primary: #FFFFFF;
  --color-secondary: #0891B2;
  --color-accent: #E11D48;
  --color-on-accent: #FFFFFF;
  --color-background: #F8FAFC;
  --color-card: #FFFFFF;
  --color-foreground: #0F172A;
  --color-muted: #F1F5FD;
  --color-muted-foreground: #475569;
  --color-border: #E4ECFC;
  --color-destructive: #B91C1C;

  --font-sans: "Plus Jakarta Sans", "PingFang TC", "PingFang SC", "Noto Sans TC", "Noto Sans SC", sans-serif;
  --font-regular: 400;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --icon-lg: 1.5rem;
  --content-width: 75rem;
  --reading-width: 45rem;
  --transition-fast: 150ms ease;
}

html:lang(zh-Hans) {
  --font-sans: "Plus Jakarta Sans", "PingFang SC", "Noto Sans SC", "PingFang TC", "Noto Sans TC", sans-serif;
}

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

html {
  background: var(--color-background);
  color: var(--color-foreground);
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  min-width: 0;
  margin: 0;
  background: var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: var(--font-regular);
  line-height: 1.5;
  overflow-x: clip;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-primary);
  overflow-wrap: anywhere;
  text-underline-offset: var(--space-1);
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: var(--space-1);
}

p,
ul {
  margin-block: 0;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.5rem, 7vw, 4.75rem);
  font-weight: var(--font-extrabold);
  line-height: 1.08;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: var(--font-bold);
  line-height: 1.15;
}

h3 {
  font-size: 1.25rem;
  font-weight: var(--font-semibold);
  line-height: 1.3;
}

.skip-link {
  position: fixed;
  z-index: 20;
  inset-block-start: var(--space-2);
  inset-inline-start: var(--space-2);
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: var(--font-semibold);
  transform: translateY(-160%);
}

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

.container {
  width: min(calc(100% - var(--space-8)), var(--content-width));
  margin-inline: auto;
}

.site-banner,
.hero {
  background: var(--color-card);
}

.hero {
  padding-block-end: var(--space-16);
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3) var(--space-6);
  padding-block: var(--space-4);
}

.brand {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand img {
  width: auto;
  height: 2.5rem;
}

.nav-cluster,
.primary-nav,
.language-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.nav-cluster {
  justify-content: flex-end;
}

.primary-nav a,
.language-nav a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  padding-inline: var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-muted-foreground);
  font-size: 0.875rem;
  font-weight: var(--font-semibold);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.primary-nav a:hover,
.language-nav a:hover,
.language-nav a[aria-current="page"] {
  background: var(--color-muted);
  color: var(--color-foreground);
}

.language-nav {
  padding-inline-start: var(--space-2);
  border-inline-start: 1px solid var(--color-border);
}

.hero-content {
  max-width: 62rem;
  margin-inline: auto;
  padding-block-start: var(--space-12);
  text-align: center;
}

.hero-kicker {
  margin-block-end: var(--space-4);
}

.hero-kicker img {
  width: min(20rem, 100%);
  height: auto;
  margin-inline: auto;
}

.hero-summary {
  max-width: 44rem;
  margin: var(--space-6) auto 0;
  color: var(--color-muted-foreground);
  font-size: 1.125rem;
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-block-start: var(--space-8);
}

.button {
  min-height: 3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: var(--font-semibold);
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: filter var(--transition-fast);
}

.button:hover {
  filter: brightness(0.92);
}

.button:active {
  filter: brightness(0.84);
}

.button--accent {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-on-accent);
}

.button--secondary {
  background: var(--color-card);
  color: var(--color-primary);
}

.system-note {
  margin-block-start: var(--space-4);
  color: var(--color-muted-foreground);
  font-size: 0.875rem;
}

.section {
  padding-block: var(--space-16);
  scroll-margin-block-start: var(--space-4);
}

.section--muted {
  background: var(--color-muted);
}

.section-heading {
  max-width: var(--reading-width);
  margin-inline: auto;
  text-align: center;
}

.section-heading p {
  margin-block-start: var(--space-4);
  color: var(--color-muted-foreground);
  font-size: 1.125rem;
}

.demo-figure {
  max-width: 68rem;
  margin: var(--space-8) auto 0;
}

.demo-frame {
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-card);
}

.demo-frame img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.demo-figure figcaption {
  max-width: var(--reading-width);
  margin: var(--space-4) auto 0;
  color: var(--color-muted-foreground);
  font-size: 0.875rem;
  text-align: center;
}

.feature-grid,
.pricing-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin-block-start: var(--space-8);
}

.feature-card,
.plan-card {
  min-width: 0;
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-card);
}

.feature-icon {
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  margin-block-end: var(--space-6);
  border-radius: var(--radius-md);
  background: var(--color-muted);
  color: var(--color-primary);
}

.feature-icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
}

.feature-card p,
.plan-card p {
  margin-block-start: var(--space-3);
  color: var(--color-muted-foreground);
}

.feature-card .privacy-promise {
  color: var(--color-foreground);
  font-size: 1.25rem;
  font-weight: var(--font-bold);
}

.pricing-grid {
  max-width: 56rem;
  margin-inline: auto;
  margin-block-start: var(--space-8);
}

.plan-card {
  display: flex;
  flex-direction: column;
}

.plan-card--pro {
  border: 2px solid var(--color-accent);
}

.plan-label {
  align-self: flex-start;
  margin-block-end: var(--space-4);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-muted);
  color: var(--color-muted-foreground);
  font-size: 0.875rem;
  font-weight: var(--font-semibold);
}

.plan-price {
  min-height: 3rem;
  margin-block-start: var(--space-4) !important;
  color: var(--color-foreground) !important;
  font-size: 1.5rem;
  font-weight: var(--font-bold);
}

.plan-card ul {
  flex: 1;
  margin-block: var(--space-6);
  padding-inline-start: var(--space-6);
  color: var(--color-muted-foreground);
}

.plan-card li + li {
  margin-block-start: var(--space-2);
}

.plan-card li::marker {
  color: var(--color-primary);
}

.pricing-note {
  max-width: 56rem;
  margin: var(--space-6) auto 0;
  color: var(--color-muted-foreground);
  font-size: 0.875rem;
  text-align: center;
}

.faq-list {
  max-width: var(--reading-width);
  margin: var(--space-8) auto 0;
}

.faq-list details {
  border-block-end: 1px solid var(--color-border);
  background: var(--color-card);
}

.faq-list details:first-child {
  border-block-start: 1px solid var(--color-border);
}

.faq-list summary {
  min-height: 3rem;
  padding-block: var(--space-4);
  color: var(--color-foreground);
  font-weight: var(--font-semibold);
  cursor: pointer;
}

.faq-list details p {
  padding-block-end: var(--space-4);
  color: var(--color-muted-foreground);
}

.final-cta {
  text-align: center;
}

.referral-note {
  max-width: 40rem;
  margin: var(--space-6) auto 0;
  color: var(--color-muted-foreground);
}

.site-footer {
  padding-block: var(--space-8);
  border-block-start: 1px solid var(--color-border);
  background: var(--color-card);
}

.footer-layout,
.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-6);
}

.footer-layout {
  justify-content: space-between;
}

.footer-links a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  color: var(--color-muted-foreground);
  font-weight: var(--font-semibold);
}

.footer-layout > a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  font-weight: var(--font-semibold);
}

.footer-meta {
  color: var(--color-muted-foreground);
  font-size: 0.875rem;
}

.legal-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.legal-header {
  padding-block: var(--space-4);
  border-block-end: 1px solid var(--color-border);
  background: var(--color-card);
}

.legal-main {
  flex: 1;
  width: min(calc(100% - var(--space-8)), var(--reading-width));
  margin-inline: auto;
  padding-block: var(--space-16);
}

.legal-main > p {
  margin-block-start: var(--space-4);
  color: var(--color-muted-foreground);
}

.legal-languages {
  display: grid;
  gap: var(--space-4);
  margin-block-start: var(--space-8);
}

.legal-languages article {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-card);
}

.legal-languages p {
  margin-block-start: var(--space-3);
  color: var(--color-muted-foreground);
}

@media (min-width: 48rem) {
  .feature-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .pricing-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .feature-card,
  .plan-card {
    padding: var(--space-8);
  }

  .legal-languages {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 47.999rem) {
  .site-header {
    align-items: flex-start;
  }

  .nav-cluster {
    width: 100%;
    justify-content: flex-start;
  }

  .primary-nav {
    width: 100%;
  }

  .language-nav {
    padding-block-start: var(--space-2);
    padding-inline-start: 0;
    border-block-start: 1px solid var(--color-border);
    border-inline-start: 0;
  }

  .hero-content {
    padding-block-start: var(--space-8);
    text-align: start;
  }

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

  .hero-actions {
    justify-content: flex-start;
  }

  .hero-summary {
    margin-inline: 0;
  }
}

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

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