/*
  DirectTrust org landing page
  Brand palette carried over from directtrust-tools-docs so the two sites feel
  like one family: brand blue #004f93, accent green #5cb172.
*/

:root {
  --color-bg: #f6f8fa;
  --color-surface: #ffffff;
  --color-border: #e3e7ec;
  --color-text: #22282f;
  --color-text-muted: #5a6470;
  --color-text-faint: #8994a1;

  --brand-blue: #004f93;
  --brand-blue-dark: #00396b;
  --brand-blue-tint: rgba(0, 79, 147, 0.08);
  --brand-green: #5cb172;
  --brand-green-tint: rgba(92, 177, 114, 0.12);

  --shadow-card: 0 1px 2px rgba(16, 24, 40, 0.04), 0 1px 3px rgba(16, 24, 40, 0.06);
  --shadow-card-hover: 0 4px 10px rgba(16, 24, 40, 0.07), 0 2px 4px rgba(16, 24, 40, 0.06);

  --radius: 10px;
  --max-width: 1080px;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1418;
    --color-surface: #171d23;
    --color-border: #2a323a;
    --color-text: #eef1f4;
    --color-text-muted: #aab3bd;
    --color-text-faint: #74808c;

    --brand-blue: #5b9bd5;
    --brand-blue-dark: #7bb0de;
    --brand-blue-tint: rgba(91, 155, 213, 0.12);
    --brand-green: #6dc783;
    --brand-green-tint: rgba(109, 199, 131, 0.14);

    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.4);

    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial,
    sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--brand-blue);
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-text);
}

.brand img {
  height: 28px;
  width: auto;
  display: block;
}

.brand-name {
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--brand-blue);
}

.site-nav a.external {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(135deg, var(--brand-blue) 0%, var(--brand-blue-dark) 100%);
  color: #ffffff;
  padding: 72px 0 64px;
}

.hero .wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--brand-green);
  background: rgba(255, 255, 255, 0.1);
  padding: 5px 12px;
  border-radius: 999px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  max-width: 720px;
}

.hero p {
  margin: 0;
  max-width: 620px;
  font-size: 16.5px;
  color: rgba(255, 255, 255, 0.86);
}

.hero-links {
  margin-top: 8px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-links a {
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 8px;
  transition: transform 0.15s ease, background 0.15s ease;
}

.hero-links a.primary {
  background: #ffffff;
  color: var(--brand-blue-dark);
}

.hero-links a.primary:hover {
  transform: translateY(-1px);
  background: #f3f6fa;
}

.hero-links a.secondary {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.hero-links a.secondary:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ---------- Categories ---------- */

main {
  padding: 56px 0 24px;
}

.category {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.category:first-child {
  border-top: none;
}

.category-heading {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.category-heading h2 {
  margin: 0;
  font-size: 23px;
  letter-spacing: -0.01em;
}

.category-number {
  font-size: 13px;
  font-weight: 700;
  color: var(--brand-green);
  letter-spacing: 0.06em;
}

.category-intro {
  margin: 0 0 28px;
  color: var(--color-text-muted);
  max-width: 700px;
  font-size: 15px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px 22px 20px;
  text-decoration: none;
  color: var(--color-text);
  box-shadow: var(--shadow-card);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

a.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--brand-blue);
}

.card-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--brand-blue-tint);
  color: var(--brand-blue);
}

.card-icon svg {
  width: 20px;
  height: 20px;
}

.card h3 {
  margin: 0;
  font-size: 16.5px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.card p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-muted);
  flex-grow: 1;
}

.card-link {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--brand-blue);
}

a.card:hover .card-link {
  color: var(--brand-blue-dark);
}

.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--brand-green-tint);
  color: #2f7a45;
}

@media (prefers-color-scheme: dark) {
  .badge {
    color: var(--brand-green);
  }
}

.card-disabled {
  background: transparent;
  border-style: dashed;
  color: var(--color-text-muted);
}

.card-disabled .card-icon {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-faint);
}

.card-disabled .badge {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-faint);
}

/* ---------- Subsection (Use Cases) ---------- */

.subsection {
  margin-top: 36px;
  padding-top: 32px;
  border-top: 1px dashed var(--color-border);
}

.subsection-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.subsection-heading h3 {
  margin: 0;
  font-size: 17.5px;
}

.placeholder-panel {
  display: flex;
  align-items: center;
  gap: 16px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  color: var(--color-text-faint);
  background: var(--color-surface);
}

.placeholder-panel .card-icon {
  flex-shrink: 0;
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-faint);
}

.placeholder-panel p {
  margin: 0;
  font-size: 14px;
}

.placeholder-panel strong {
  display: block;
  color: var(--color-text-muted);
  font-size: 14.5px;
  margin-bottom: 2px;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: 24px;
  padding: 28px 0 40px;
}

.site-footer .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.site-footer p {
  margin: 0;
  font-size: 13px;
  color: var(--color-text-faint);
}

.footer-links {
  display: flex;
  gap: 18px;
}

.footer-links a {
  font-size: 13px;
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--brand-blue);
}

@media (max-width: 600px) {
  .site-nav {
    gap: 16px;
  }

  .hero {
    padding: 52px 0 44px;
  }

  .site-footer .wrap {
    flex-direction: column;
    align-items: flex-start;
  }
}