:root {
  --kb-blue: #2563eb;
  --kb-blue-deep: #1e40af;
  --kb-on-primary: #ffffff;
  --kb-bg: #f8fafc;
  --kb-surface: #ffffff;
  --kb-ink: #0f172a;
  --kb-muted: #64748b;
  --kb-outline: #e2e8f0;
  --kb-tint: #eff6ff;
  --kb-shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 10px 28px rgba(15, 23, 42, 0.06);
  --kb-radius: 20px;
  --kb-max: 44rem;
  --kb-wide: 58rem;
  --kb-focus: 0 0 0 3px rgba(37, 99, 235, 0.35);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --kb-bg: #0f172a;
    --kb-surface: #1e293b;
    --kb-ink: #f8fafc;
    --kb-muted: #94a3b8;
    --kb-outline: #334155;
    --kb-tint: #1e3a5f;
    --kb-blue-deep: #bfdbfe;
    --kb-shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 12px 32px rgba(0, 0, 0, 0.28);
    --kb-focus: 0 0 0 3px rgba(96, 165, 250, 0.45);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--kb-ink);
  background: var(--kb-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--kb-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--kb-blue-deep);
}

a:focus-visible,
button:focus-visible,
.btn:focus-visible {
  outline: none;
  box-shadow: var(--kb-focus);
  border-radius: 8px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--kb-blue);
  color: var(--kb-on-primary);
  border-radius: 10px;
  text-decoration: none;
}

.skip-link:focus {
  top: 0.75rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--kb-bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid var(--kb-outline);
}

.header-inner,
.footer-inner,
.page {
  width: min(100% - 2rem, var(--kb-wide));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  min-height: 4rem;
  padding-block: 0.4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--kb-ink);
  font-weight: 650;
  letter-spacing: -0.03em;
  font-size: 1.15rem;
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem;
}

.nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.85rem;
  color: var(--kb-muted);
  font-size: 0.95rem;
  font-weight: 550;
  text-decoration: none;
  border-radius: 999px;
}

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

.page {
  flex: 1;
  width: min(100% - 2rem, var(--kb-max));
  padding: 2.5rem 0 4rem;
}

.page--home {
  width: min(100% - 2rem, var(--kb-wide));
}

.hero {
  display: grid;
  gap: 1.25rem;
  padding: 1.5rem 0 2.5rem;
}

.hero-mark {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.hero-mark img {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  box-shadow: var(--kb-shadow);
}

.eyebrow {
  margin: 0;
  color: var(--kb-blue);
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0.15rem 0 0.75rem;
  font-size: clamp(2rem, 5vw, 2.85rem);
  line-height: 1.12;
  letter-spacing: -0.04em;
  font-weight: 700;
}

.lede {
  margin: 0;
  max-width: 38rem;
  color: var(--kb-muted);
  font-size: 1.125rem;
}

.tagline {
  margin: 0.4rem 0 0;
  color: var(--kb-ink);
  font-weight: 600;
}

.principle {
  margin: 0;
  color: var(--kb-muted);
  font-style: italic;
}

.grid {
  display: grid;
  gap: 1rem;
  margin: 0.5rem 0 2.5rem;
}

@media (max-width: 720px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    min-height: 0;
    padding-block: 0.7rem;
  }

  .nav {
    width: 100%;
    margin-inline: 0;
  }

  .nav a {
    padding-inline: 0.7rem;
  }
}

@media (max-width: 520px) {
  .nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.15rem;
  }

  .nav a {
    justify-content: flex-start;
  }
}

@media (min-width: 720px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }

  .grid .card--wide {
    grid-column: 1 / -1;
  }
}

.card {
  background: var(--kb-surface);
  border: 1px solid var(--kb-outline);
  border-radius: var(--kb-radius);
  box-shadow: var(--kb-shadow);
  padding: 1.35rem 1.4rem 1.45rem;
}

.card h2,
.card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.08rem;
  letter-spacing: -0.02em;
}

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

.card p + p {
  margin-top: 0.75rem;
}

.support-card {
  background: var(--kb-tint);
  border-color: color-mix(in srgb, var(--kb-blue) 22%, var(--kb-outline));
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.55rem 1.2rem;
  margin-top: 1rem;
  background: var(--kb-blue);
  color: var(--kb-on-primary);
  font-weight: 600;
  text-decoration: none;
  border-radius: 999px;
}

.btn:hover {
  color: var(--kb-on-primary);
  filter: brightness(1.05);
}

.legal-note {
  margin: 0 0 1.75rem;
  padding: 1rem 1.15rem;
  background: var(--kb-tint);
  border: 1px solid color-mix(in srgb, var(--kb-blue) 22%, var(--kb-outline));
  border-radius: 14px;
  color: var(--kb-ink);
}

.legal-note > strong:first-child {
  display: block;
  margin-bottom: 0.25rem;
}

.placeholder {
  display: block;
  margin: 0.5rem 0;
  padding: 0.85rem 1rem;
  background: var(--kb-surface);
  border: 1px dashed var(--kb-muted);
  border-radius: 12px;
  font-size: 0.95rem;
  line-height: 1.55;
  white-space: pre-line;
}

h2 {
  margin: 2rem 0 0.6rem;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

h3 {
  margin: 1.4rem 0 0.4rem;
  font-size: 1.08rem;
}

p,
ul {
  color: var(--kb-ink);
}

.prose ul {
  padding-left: 1.2rem;
}

.prose li {
  margin: 0.35rem 0;
}

.prose li::marker {
  color: var(--kb-blue);
}

.meta {
  color: var(--kb-muted);
  font-size: 0.95rem;
}

.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--kb-outline);
  background: var(--kb-surface);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding: 1.35rem 0 1.6rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.15rem;
}

.footer-nav a,
.footer-copy {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.7rem;
  color: var(--kb-muted);
  font-size: 0.92rem;
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--kb-ink);
}

.footer-copy {
  padding-left: 0;
}

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