:root {
  color-scheme: light;
  --radius: 0.45rem;
  --background: oklch(0.985 0.013 226);
  --foreground: oklch(0.22 0.035 255);
  --card: oklch(0.997 0.006 205);
  --card-foreground: oklch(0.22 0.035 255);
  --primary: oklch(0.57 0.16 242);
  --primary-foreground: oklch(0.99 0.01 210);
  --secondary: oklch(0.94 0.045 210);
  --secondary-foreground: oklch(0.34 0.08 240);
  --muted: oklch(0.95 0.024 220);
  --muted-foreground: oklch(0.5 0.045 245);
  --accent: oklch(0.91 0.08 178);
  --accent-foreground: oklch(0.28 0.07 185);
  --success: oklch(0.58 0.12 165);
  --success-foreground: oklch(0.99 0.01 170);
  --warning: oklch(0.82 0.15 80);
  --warning-foreground: oklch(0.29 0.07 58);
  --border: oklch(0.88 0.038 220);
  --input: oklch(0.86 0.04 220);
  --ring: oklch(0.64 0.14 228);
  --surface-blue: oklch(0.95 0.05 225);
  --surface-teal: oklch(0.94 0.065 178);
  --surface-orange: oklch(0.94 0.075 55);
  --surface-yellow: oklch(0.96 0.08 92);
  --shadow-color: 218 74% 42%;
}

* {
  box-sizing: border-box;
}

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

body {
  min-height: 100vh;
  margin: 0;
  color: var(--foreground);
  background:
    radial-gradient(
      circle at 8% 2%,
      color-mix(in oklch, var(--primary) 18%, transparent) 0,
      transparent 23rem
    ),
    radial-gradient(
      circle at 88% 8%,
      color-mix(in oklch, var(--accent) 24%, transparent) 0,
      transparent 20rem
    ),
    radial-gradient(
      circle at 55% 96%,
      color-mix(in oklch, var(--warning) 16%, transparent) 0,
      transparent 24rem
    ),
    linear-gradient(
      180deg,
      var(--background) 0%,
      color-mix(in oklch, var(--background) 92%, var(--surface-blue)) 100%
    );
  font-family:
    "Avenir Next",
    "Nunito Sans",
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  font-size: 16px;
  line-height: 1.75;
  text-wrap: pretty;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: color-mix(in oklch, var(--primary) 22%, transparent);
}

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

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid color-mix(in oklch, var(--border) 70%, transparent);
  background: color-mix(in oklch, var(--background) 82%, transparent);
  backdrop-filter: blur(20px);
}

.nav {
  width: min(1120px, calc(100% - 32px));
  min-height: 56px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  min-width: 0;
  gap: 10px;
  font-weight: 700;
}

.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid color-mix(in oklch, var(--primary) 20%, transparent);
  border-radius: var(--radius);
  color: var(--primary-foreground);
  background: var(--primary);
  box-shadow: 0 6px 18px hsl(var(--shadow-color) / 0.14);
  font-size: 14px;
}

.nav-links {
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
  color: var(--muted-foreground);
  font-size: 14px;
}

.nav-links a {
  min-height: 36px;
  padding: 7px 10px;
  display: inline-flex;
  align-items: center;
  border-radius: calc(var(--radius) - 0.1rem);
  transition:
    background-color 160ms ease,
    color 160ms ease;
}

.nav-links a:hover {
  color: var(--accent-foreground);
  background: color-mix(in oklch, var(--accent) 80%, transparent);
}

.nav-action {
  min-height: 38px;
  padding: 8px 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  color: var(--primary-foreground);
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  background: var(--primary);
  box-shadow: 0 6px 18px hsl(var(--shadow-color) / 0.14);
  font-size: 14px;
  font-weight: 700;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    transform 160ms ease;
}

.nav-action:hover {
  border-color: color-mix(in oklch, var(--primary) 90%, black);
  background: color-mix(in oklch, var(--primary) 90%, black);
  transform: translateY(-1px);
}

.page {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 64px;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted-foreground);
  font-size: 14px;
}

.breadcrumbs a {
  border-radius: calc(var(--radius) - 0.15rem);
}

.breadcrumbs a:hover,
.related-card:hover strong {
  color: var(--primary);
}

.hero {
  margin-top: 16px;
  padding: 30px;
  border: 1px solid color-mix(in oklch, var(--primary) 15%, var(--border));
  border-radius: calc(var(--radius) + 0.15rem);
  background: color-mix(in oklch, var(--card) 88%, transparent);
  box-shadow: 0 18px 46px hsl(var(--shadow-color) / 0.08);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--foreground);
  font-family: inherit;
  font-weight: 700;
  letter-spacing: 0;
  text-wrap: balance;
}

h1 {
  max-width: 820px;
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1.12;
}

h2 {
  font-size: clamp(22px, 2.6vw, 28px);
  line-height: 1.22;
}

h3 {
  font-size: 18px;
  line-height: 1.35;
}

.summary {
  max-width: 760px;
  margin-top: 14px;
  color: var(--muted-foreground);
  font-size: 17px;
  line-height: 1.65;
}

.summary p,
.content-section p,
.faq-list p,
.cta p,
.compliance p {
  margin: 12px 0 0;
}

.updated {
  margin: 18px 0 0;
  color: var(--muted-foreground);
  font-size: 14px;
}

.content-section,
.question-block,
.faq-section,
.related,
.cta,
.compliance {
  margin-top: 18px;
  padding: 24px;
  border: 1px solid color-mix(in oklch, var(--border) 75%, transparent);
  border-radius: calc(var(--radius) + 0.15rem);
  background: color-mix(in oklch, var(--card) 90%, transparent);
  box-shadow: 0 18px 46px hsl(var(--shadow-color) / 0.08);
}

.content-section ul,
.content-section ol {
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  list-style: none;
}

.content-section li,
.content-section ol li {
  position: relative;
  padding-left: 18px;
  color: color-mix(in oklch, var(--foreground) 84%, var(--muted-foreground));
}

.content-section li::before,
.content-section ol li::before {
  position: absolute;
  left: 0;
  color: var(--primary);
  content: "•";
}

.question-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.question-head .eyebrow {
  margin-bottom: 8px;
}

.question-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.question-badges span {
  min-height: 30px;
  padding: 5px 10px;
  display: inline-flex;
  align-items: center;
  border: 1px solid color-mix(in oklch, var(--accent) 42%, var(--border));
  border-radius: calc(var(--radius) - 0.1rem);
  color: var(--accent-foreground);
  background: color-mix(in oklch, var(--accent) 62%, white);
  font-size: 13px;
  font-weight: 600;
}

.question-stem {
  margin: 20px 0 0;
  padding-top: 18px;
  border-top: 1px solid color-mix(in oklch, var(--border) 82%, transparent);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 650;
  line-height: 1.65;
}

.options {
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  list-style: none;
  counter-reset: option;
}

.options li {
  min-height: 44px;
  padding: 12px 14px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border: 1px solid color-mix(in oklch, var(--border) 78%, transparent);
  border-radius: var(--radius);
  background: color-mix(in oklch, var(--background) 82%, white);
  color: color-mix(in oklch, var(--foreground) 88%, var(--muted-foreground));
  line-height: 1.55;
}

.answer-grid {
  margin-top: 18px;
  display: grid;
  gap: 12px;
}

.answer-box,
.explanation-box {
  padding: 16px;
  border-radius: var(--radius);
}

.answer-box {
  border: 1px solid color-mix(in oklch, var(--success) 26%, var(--border));
  background: color-mix(in oklch, var(--success) 10%, white);
  color: var(--success);
}

.explanation-box {
  border: 1px solid color-mix(in oklch, var(--border) 78%, transparent);
  background: color-mix(in oklch, var(--background) 78%, white);
}

.answer-box p,
.explanation-box p {
  margin: 8px 0 0;
  color: var(--muted-foreground);
}

.knowledge {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid color-mix(in oklch, var(--border) 80%, transparent);
}

.knowledge-tags {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.knowledge-tags span {
  padding: 5px 9px;
  border-radius: calc(var(--radius) - 0.1rem);
  color: var(--secondary-foreground);
  background: color-mix(in oklch, var(--secondary) 78%, white);
  font-size: 13px;
  font-weight: 600;
}

.content-section p,
.faq-list p,
.related-card span,
.compliance p {
  color: var(--muted-foreground);
}

.faq-list {
  margin-top: 18px;
  display: grid;
  gap: 12px;
}

details {
  padding: 18px;
  border: 1px solid color-mix(in oklch, var(--border) 75%, transparent);
  border-radius: var(--radius);
  background: color-mix(in oklch, var(--surface-blue) 58%, white);
}

details[open] {
  border-color: color-mix(in oklch, var(--primary) 24%, var(--border));
  background: color-mix(in oklch, var(--secondary) 72%, white);
}

summary {
  cursor: pointer;
  color: var(--foreground);
  font-weight: 700;
}

.related-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.related-card {
  min-height: 116px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border: 1px solid color-mix(in oklch, var(--border) 75%, transparent);
  border-radius: var(--radius);
  background: color-mix(in oklch, var(--card) 92%, transparent);
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    background-color 160ms ease,
    box-shadow 160ms ease;
}

.related-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in oklch, var(--primary) 40%, var(--border));
  background: color-mix(in oklch, var(--secondary) 70%, white);
  box-shadow: 0 14px 34px hsl(var(--shadow-color) / 0.08);
}

.related-card strong {
  font-size: 16px;
  line-height: 1.4;
  transition: color 160ms ease;
}

.related-card span {
  color: var(--muted-foreground);
  font-size: 14px;
}

.cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  color: var(--primary-foreground);
  border-color: color-mix(in oklch, var(--primary) 30%, transparent);
  background:
    radial-gradient(
      circle at 92% 18%,
      color-mix(in oklch, var(--accent) 42%, transparent) 0,
      transparent 18rem
    ),
    linear-gradient(
      135deg,
      var(--primary) 0%,
      color-mix(in oklch, var(--primary) 72%, var(--accent)) 100%
    );
  box-shadow: 0 18px 46px hsl(var(--shadow-color) / 0.12);
}

.cta h2 {
  color: inherit;
}

.cta p {
  color: color-mix(in oklch, var(--primary-foreground) 86%, transparent);
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  min-height: 38px;
  padding: 9px 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: calc(var(--radius) - 0.1rem);
  font-size: 14px;
  font-weight: 700;
  transition:
    transform 150ms ease,
    background-color 150ms ease,
    border-color 150ms ease,
    box-shadow 150ms ease;
}

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

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

.button.primary {
  color: var(--primary);
  background: var(--primary-foreground);
  box-shadow: 0 8px 22px hsl(var(--shadow-color) / 0.16);
}

.button.secondary {
  color: var(--primary-foreground);
  border-color: color-mix(in oklch, var(--primary-foreground) 52%, transparent);
  background: color-mix(in oklch, var(--primary-foreground) 12%, transparent);
}

.compliance {
  border-color: color-mix(in oklch, var(--success) 20%, var(--border));
  background: color-mix(in oklch, var(--surface-teal) 54%, white);
}

.compliance strong {
  color: var(--success);
}

.footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 26px 0 40px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted-foreground);
  border-top: 1px solid color-mix(in oklch, var(--border) 75%, transparent);
  font-size: 14px;
}

.pricing-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 0.75fr);
  overflow: hidden;
  margin-top: 1.25rem;
  border: 1px solid color-mix(in oklch, var(--border) 78%, transparent);
  border-radius: calc(var(--radius) + 0.15rem);
  background: color-mix(in oklch, var(--card) 92%, transparent);
  box-shadow: 0 18px 46px hsl(var(--shadow-color) / 0.08);
}

.pricing-benefits,
.purchase-panel {
  padding: clamp(1.25rem, 3vw, 2.5rem);
}

.pricing-benefits h2,
.comparison-section h2,
.pricing-final h2 {
  margin: 0.35rem 0 0;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  line-height: 1.2;
}

.pricing-benefits > p:not(.eyebrow),
.comparison-section header p,
.pricing-final p {
  color: var(--muted-foreground);
}

.benefit-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}

.benefit-list li {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 3rem;
  padding: 0.75rem;
  border: 1px solid color-mix(in oklch, var(--primary) 16%, var(--border));
  border-radius: var(--radius);
  background: color-mix(in oklch, var(--secondary) 60%, white);
  font-weight: 700;
}

.benefit-list span {
  color: var(--success);
}

.renew-note {
  margin: 0;
  font-size: 0.9rem;
}

.purchase-panel {
  color: var(--primary-foreground);
  background: var(--primary);
}

.plan-tabs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  padding: 0.35rem;
  border: 1px solid color-mix(in oklch, var(--primary-foreground) 25%, transparent);
  border-radius: var(--radius);
  background: color-mix(in oklch, black 10%, transparent);
}

.plan-tab {
  display: grid;
  min-height: 4.5rem;
  place-content: center;
  gap: 0.15rem;
  border: 1px solid transparent;
  border-radius: calc(var(--radius) - 0.1rem);
  color: inherit;
  background: transparent;
  font: inherit;
  cursor: pointer;
}

.plan-tab.active {
  color: var(--primary);
  background: var(--primary-foreground);
  box-shadow: 0 8px 22px hsl(var(--shadow-color) / 0.18);
}

.price-display {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-top: 2rem;
}

.price-display .currency { font-size: 1.35rem; }
.price-display strong { font-size: clamp(3rem, 7vw, 4.75rem); line-height: 1; }
.price-display > span:last-child { color: color-mix(in oklch, var(--primary-foreground) 78%, transparent); }
.payment-note { margin: 0.7rem 0 1.25rem; color: color-mix(in oklch, var(--primary-foreground) 84%, transparent); }
.checkout-button { width: 100%; min-height: 3rem; color: var(--primary); background: var(--primary-foreground); }
.availability-note { margin: 0.8rem 0 0; color: color-mix(in oklch, var(--primary-foreground) 70%, transparent); font-size: 0.78rem; line-height: 1.6; }

.comparison-section,
.pricing-final {
  margin-top: 1.25rem;
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid color-mix(in oklch, var(--border) 78%, transparent);
  border-radius: calc(var(--radius) + 0.15rem);
  background: color-mix(in oklch, var(--card) 92%, transparent);
}

.comparison-wrap { margin-top: 1.25rem; overflow-x: auto; }
.comparison-wrap table { width: 100%; min-width: 34rem; border-collapse: collapse; }
.comparison-wrap th, .comparison-wrap td { padding: 0.9rem 1rem; border-bottom: 1px solid var(--border); text-align: left; }
.comparison-wrap thead th { color: var(--muted-foreground); font-size: 0.82rem; }
.comparison-wrap tbody th { font-weight: 600; }
.comparison-wrap td strong { color: var(--primary); }
.pricing-faq { margin-top: 1.25rem; }

.pricing-final {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  color: var(--primary-foreground);
  border-color: color-mix(in oklch, var(--primary) 30%, transparent);
  background: var(--primary);
}

.pricing-final .eyebrow,
.pricing-final p { color: color-mix(in oklch, var(--primary-foreground) 82%, transparent); }
.pricing-final .button { min-width: 10rem; color: var(--primary); background: var(--primary-foreground); }

@media (max-width: 760px) {
  .pricing-shell { grid-template-columns: 1fr; }
  .benefit-list { grid-template-columns: 1fr; }
  .pricing-final { align-items: stretch; flex-direction: column; }
  .pricing-final .button { width: 100%; }
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
    gap: 4px;
  }

  .nav-links a {
    padding-inline: 8px;
  }

  .nav-action {
    width: 100%;
  }

  .page {
    width: min(100% - 24px, 960px);
    padding-top: 20px;
  }

  .hero {
    padding: 22px;
  }

  .content-section,
  .question-block,
  .faq-section,
  .related,
  .cta,
  .compliance {
    padding: 20px;
  }

  .question-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .question-badges {
    justify-content: flex-start;
  }

  .related-grid,
  .cta {
    grid-template-columns: 1fr;
  }

  .cta-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .footer {
    flex-direction: column;
  }
}