*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --colour-bg: #f9f9f9;
  --colour-surface: #ffffff;
  --colour-primary: #2563eb;
  --colour-primary-dark: #1d4ed8;
  --colour-text: #1e293b;
  --colour-text-muted: #64748b;
  --colour-border: #e2e8f0;
  --colour-accent: #0ea5e9;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--colour-bg);
  color: var(--colour-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--colour-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  color: var(--colour-primary-dark);
}

/* ── Header & Nav ── */
header {
  background: var(--colour-surface);
  border-bottom: 1px solid var(--colour-border);
  box-shadow: var(--shadow);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--colour-text);
}

.site-title a {
  color: inherit;
}

.site-title a:hover {
  text-decoration: none;
  color: var(--colour-primary);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--colour-text-muted);
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--colour-primary);
  text-decoration: none;
}

/* ── Main content ── */
main {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* ── Hero (home page) ── */
.hero {
  text-align: center;
  padding: 4rem 0 2rem;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.hero p {
  font-size: 1.125rem;
  color: var(--colour-text-muted);
  max-width: 520px;
  margin: 0 auto 2rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  background: var(--colour-primary);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.15s;
}

.btn:hover {
  background: var(--colour-primary-dark);
  text-decoration: none;
  color: #fff;
}

/* ── Page heading ── */
.page-header {
  margin-bottom: 2.5rem;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.page-header p {
  color: var(--colour-text-muted);
  font-size: 1rem;
  max-width: 640px;
}

/* ── Qualification sections ── */
.qual-section {
  margin-bottom: 2rem;
}

.qual-section h2 {
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--colour-text-muted);
  margin-bottom: 1rem;
}

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

.qual-card {
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.qual-icon {
  flex-shrink: 0;
  width: 72px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.qual-icon a {
  display: block;
  line-height: 0;
}

.qual-icon img {
  width: 72px;
  height: auto;
  object-fit: contain;
  border-radius: 4px;
}

.qual-body h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.qual-body p {
  font-size: 0.875rem;
  color: var(--colour-text-muted);
  line-height: 1.5;
}

.qual-body .issuer {
  font-size: 0.8rem;
  color: var(--colour-accent);
  font-weight: 600;
  margin-top: 0.35rem;
  display: block;
}

/* ── Footer ── */
footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.85rem;
  color: var(--colour-text-muted);
  border-top: 1px solid var(--colour-border);
  background: var(--colour-surface);
}

.logo-attribution {
  font-size: 0.75rem;
  margin-bottom: 0.5rem;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .page-header h1 {
    font-size: 1.5rem;
  }
}