@font-face {
  font-family: 'Inter';
  src: url('fonts/Inter-Light.woff2') format('woff2');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('fonts/Inter-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('fonts/Inter-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --color-canvas-dark: #000000;
  --color-canvas-light: #ffffff;
  --color-on-dark: #ffffff;
  --color-on-dark-mute: #cccccc;
  --color-ink: #000000;
  --color-body-light: rgba(0, 0, 0, 0.6);
  --color-mute-light: #6b6b6b;
  --color-surface-card: #f5f7fa;
  --color-surface-dark-elevated: #121314;
  --color-hairline-light: #f3f3f3;
  --color-hairline-dark: rgba(229, 229, 229, 0.2);
  --color-primary: #0070d1;
  --color-primary-pressed: #0064b7;
  --color-on-primary: #ffffff;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-full: 9999px;

  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 96px;

  --content-max: 720px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  color: var(--color-ink);
  background: var(--color-canvas-light);
}

a {
  color: inherit;
}

.nav {
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xl);
  background: var(--color-canvas-dark);
  color: var(--color-on-dark);
}

.nav-logo {
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.324px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-on-dark-mute);
}

.nav-link:hover {
  color: var(--color-on-dark);
}

.hero {
  background: var(--color-canvas-dark);
  color: var(--color-on-dark);
  padding: var(--space-section) var(--space-xl) var(--space-xxl);
  text-align: center;
}

.hero-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  font-size: 54px;
  font-weight: 300;
  line-height: 1.25;
  letter-spacing: -0.1px;
  margin: 0 auto;
  max-width: 820px;
}

.hero-title-icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
}

.hero-sub {
  font-size: 18px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.1px;
  color: var(--color-on-dark-mute);
  max-width: 560px;
  margin: var(--space-lg) auto 0;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.button-primary {
  display: inline-block;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.45px;
  line-height: 1.25;
  text-decoration: none;
  border-radius: var(--radius-full);
  padding: 12px 28px;
  height: 48px;
  box-sizing: border-box;
}

.button-primary:hover {
  background: var(--color-primary-pressed);
}

.hero-meta {
  font-size: 14px;
  color: var(--color-on-dark-mute);
}

.hero-note {
  font-size: 12px;
  color: var(--color-on-dark-mute);
  margin-top: var(--space-lg);
}

.section-light,
.section-dark {
  padding: var(--space-section) var(--space-xl);
  max-width: 1000px;
  margin: 0 auto;
}

.section-dark {
  background: var(--color-surface-dark-elevated);
  color: var(--color-on-dark);
  max-width: none;
}

.section-dark > * {
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

.section-title {
  font-size: 35px;
  font-weight: 300;
  line-height: 1.25;
  margin: 0 0 var(--space-xl);
  text-align: center;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-lg);
}

.card {
  background: var(--color-surface-card);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 var(--space-md);
}

.card-body {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-body-light);
  margin: 0;
}

.req-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 16px;
}

.req-table td {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-hairline-dark);
  vertical-align: top;
}

.req-table td:first-child {
  width: 180px;
  font-weight: 600;
  padding-right: var(--space-lg);
}

.req-table tr:last-child td {
  border-bottom: none;
}

.footer {
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: var(--space-xxl) var(--space-xl);
}

.footer-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-brand {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.45px;
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-links a {
  font-size: 14px;
  font-weight: 400;
  text-decoration: none;
  color: var(--color-on-primary);
  opacity: 0.85;
}

.footer-links a:hover {
  opacity: 1;
}

.footer-fine {
  max-width: 1000px;
  margin: var(--space-lg) auto 0;
  font-size: 12px;
  opacity: 0.75;
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 32px;
  }
  .hero-title-icon {
    width: 36px;
    height: 36px;
  }
  .section-title {
    font-size: 28px;
  }
  .section-light,
  .section-dark,
  .section-dark > * {
    padding-left: 0;
    padding-right: 0;
  }
}