:root {
  --ink: #1b1f23;
  --muted: #52606d;
  --bg: #f7f7f5;
  --card-bg: #ffffff;
  --accent: #0072b2;       /* deutan-safe blue */
  --accent-dark: #00507e;
  --border: #d9dee3;
  --shadow: 0 1px 3px rgba(27, 31, 35, 0.08), 0 1px 2px rgba(27, 31, 35, 0.06);
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 8px 16px;
  z-index: 10;
}
.skip-link:focus {
  left: 12px;
  top: 12px;
}

.site-header {
  background-color: var(--ink);
  color: #fff;
  padding: 48px 0 40px;
  border-bottom: 4px dashed var(--accent);
}

.site-header h1 {
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.site-header .tagline {
  margin: 0;
  color: #cfd6dc;
  font-size: 17px;
}

main {
  padding: 40px 20px 56px;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:has(a):hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(27, 31, 35, 0.12);
}

.card-logo-link {
  display: inline-flex;
  margin-bottom: 16px;
}

.card-logo {
  max-width: 130px;
  max-height: 130px;
  width: auto;
  height: auto;
  object-fit: contain;
}

.card-icon {
  font-size: 56px;
  line-height: 1;
  margin-bottom: 16px;
  color: var(--accent);
}

.card-no-link {
  border-style: dashed;
  border-color: var(--accent);
  border-width: 2px;
}

.card-body h2 {
  font-size: 19px;
  margin: 0 0 6px;
}

.card-body h2 a {
  color: var(--accent-dark);
  text-decoration: none;
}

.card-body h2 a:hover,
.card-body h2 a:focus {
  text-decoration: underline;
}

.card-detail {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.site-footer {
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}