/* SEN-Ed static landing – education-institutional, minimal, accessible */
:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-primary: #1d4ed8;
  --color-primary-hover: #1e40af;
  --color-border: #e2e8f0;
  --color-footer-bg: #f1f5f9;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 720px;
  --spacing: 1.5rem;
}

* { box-sizing: border-box; }
html { font-size: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -2.5rem;
  left: 0;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: white;
  text-decoration: none;
  z-index: 100;
}
.skip-link:focus { top: 0; }

/* Layout */
.wrapper { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing); }
header { background: var(--color-surface); border-bottom: 1px solid var(--color-border); padding: var(--spacing) 0; }
header .wrapper { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem; }
.logo { font-weight: 700; font-size: 1.25rem; color: var(--color-text); text-decoration: none; }
.logo:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }
nav { display: flex; gap: 1.25rem; flex-wrap: wrap; }
nav a { color: var(--color-text-muted); text-decoration: none; }
nav a:hover, nav a:focus { color: var(--color-primary); }
nav a.cross-link { font-size: 0.9375rem; color: var(--color-text-muted); }
nav a:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }

main { padding: 2rem 0 3rem; }
section { margin-bottom: 2.5rem; }
section > h2 { margin-top: 0; margin-bottom: 1rem; font-size: 1.5rem; color: var(--color-text); }
section > h3 { font-size: 1.125rem; margin: 1.25rem 0 0.5rem; color: var(--color-text); }

/* Hero */
.hero { text-align: center; padding: 2rem 0; }
.hero h1 { margin: 0 0 1rem; font-size: clamp(1.5rem, 4vw, 2rem); font-weight: 700; line-height: 1.3; color: var(--color-text); }
.hero p { margin: 0 0 1.5rem; font-size: 1.125rem; color: var(--color-text-muted); max-width: 36em; margin-left: auto; margin-right: auto; }
.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-block; padding: 0.625rem 1.25rem; border-radius: 6px; text-decoration: none; font-weight: 500; transition: background 0.15s; }
.btn-primary { background: var(--color-primary); color: white; }
.btn-primary:hover, .btn-primary:focus { background: var(--color-primary-hover); color: white; }
.btn-secondary { background: var(--color-surface); color: var(--color-text); border: 1px solid var(--color-border); }
.btn-secondary:hover, .btn-secondary:focus { border-color: var(--color-primary); color: var(--color-primary); }
.btn:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* Lists */
ul { padding-left: 1.25rem; margin: 0.5rem 0 1rem; }
ul li { margin-bottom: 0.35rem; }
.two-col ul { column-count: 2; column-gap: 2rem; }
@media (max-width: 480px) { .two-col ul { column-count: 1; } }

/* Trust block */
.trust-block { background: var(--color-footer-bg); padding: 1.5rem; border-radius: 8px; margin: 1.5rem 0; font-size: 0.9375rem; color: var(--color-text-muted); }
.trust-block strong { color: var(--color-text); }

/* Cookie notice (static, no JS) */
.cookie-notice { background: var(--color-footer-bg); padding: 0.75rem 0; font-size: 0.875rem; color: var(--color-text-muted); border-top: 1px solid var(--color-border); }
.cookie-notice p { margin: 0; }
.cookie-notice a { color: var(--color-primary); text-decoration: underline; }

/* Footer */
footer { background: var(--color-footer-bg); padding: 2rem 0; margin-top: 0; font-size: 0.875rem; color: var(--color-text-muted); }
footer a { color: var(--color-text-muted); text-decoration: none; }
footer a:hover { color: var(--color-primary); text-decoration: underline; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem 1.5rem; margin-bottom: 1rem; }
footer p:last-child { margin: 0; }

/* Sub-pages (privacy, terms, security) */
.page-title { margin-bottom: 1.5rem; font-size: 1.75rem; }
.last-updated { font-size: 0.875rem; color: var(--color-text-muted); margin-bottom: 1.5rem; }