/* SIGHTLEARN Design System — linked from layouts (not CSS-in-JS only) */
:root {
  --sl-blue-deep: #0B3A6E;
  --sl-blue: #3B9BFF;
  --sl-white: #ffffff;
  --sl-accent-red: #C62828;
  --sl-gray-50: #f7f9fc;
  --sl-gray-100: #eef2f7;
  --sl-gray-200: #dce3ec;
  --sl-gray-500: #6b7c93;
  --sl-gray-700: #334155;
  --sl-gray-900: #0f172a;
  --sl-radius: 12px;
  --sl-shadow: 0 8px 30px rgba(11, 58, 110, 0.12);
  --sl-font: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sl-font);
  color: var(--sl-gray-900);
  background: var(--sl-white);
  line-height: 1.6;
}
a { color: var(--sl-blue-deep); text-decoration: none; }
a:hover { color: var(--sl-blue); }
img { max-width: 100%; height: auto; display: block; }

.sl-container { width: min(1120px, 92vw); margin-inline: auto; }
.sl-section { padding: 4.5rem 0; }
.sl-section--muted { background: var(--sl-gray-50); }
.sl-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sl-blue);
  margin-bottom: 0.75rem;
}
.sl-h1 { font-size: clamp(2rem, 4vw, 3.25rem); line-height: 1.15; color: var(--sl-blue-deep); margin: 0 0 1rem; }
.sl-h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); color: var(--sl-blue-deep); margin: 0 0 1rem; }
.sl-lead { font-size: 1.125rem; color: var(--sl-gray-500); max-width: 40rem; }

/* Header */
.sl-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--sl-gray-200);
}
.sl-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.85rem 0;
}
.sl-logo {
  display: flex; align-items: center; gap: 0.6rem;
  font-weight: 800; font-size: 1.15rem; color: var(--sl-blue-deep); letter-spacing: 0.02em;
}
.sl-logo__mark {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--sl-blue-deep), var(--sl-blue));
  display: grid; place-items: center; color: white; font-size: 0.85rem;
}
.sl-nav { display: flex; gap: 1.25rem; align-items: center; flex-wrap: wrap; }
.sl-nav a { color: var(--sl-gray-700); font-weight: 600; font-size: 0.95rem; }
.sl-nav a:hover { color: var(--sl-blue-deep); }

/* Buttons */
.sl-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.7rem 1.25rem; border-radius: 999px; border: 2px solid transparent;
  font-weight: 700; font-size: 0.95rem; cursor: pointer; transition: 0.2s ease;
}
.sl-btn--primary { background: var(--sl-blue-deep); color: white; }
.sl-btn--primary:hover { background: var(--sl-blue); color: white; }
.sl-btn--accent { background: var(--sl-accent-red); color: white; }
.sl-btn--accent:hover { filter: brightness(1.08); color: white; }
.sl-btn--ghost { background: transparent; border-color: var(--sl-blue-deep); color: var(--sl-blue-deep); }
.sl-btn--ghost:hover { background: var(--sl-blue-deep); color: white; }
.sl-btn--light { background: white; color: var(--sl-blue-deep); }
.sl-btn--light:hover { background: var(--sl-gray-100); color: var(--sl-blue-deep); }

/* Hero slider */
.sl-hero { position: relative; overflow: hidden; background: var(--sl-blue-deep); color: white; min-height: 520px; }
.sl-hero__slides { position: relative; min-height: 520px; }
.sl-hero__slide {
  position: absolute; inset: 0; opacity: 0; transition: opacity 0.6s ease;
  display: grid; align-items: center;
  background-size: cover; background-position: center;
}
.sl-hero__slide.is-active { opacity: 1; z-index: 1; }
.sl-hero__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(105deg, rgba(11,58,110,0.92) 0%, rgba(11,58,110,0.55) 55%, rgba(59,155,255,0.25) 100%);
}
.sl-hero__content { position: relative; z-index: 2; padding: 5rem 0; max-width: 640px; }
.sl-hero__content h1 { color: white; margin: 0 0 1rem; font-size: clamp(2.2rem, 5vw, 3.5rem); line-height: 1.1; }
.sl-hero__content p { color: rgba(255,255,255,0.9); font-size: 1.15rem; margin-bottom: 1.75rem; }
.sl-hero__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.sl-hero__dots {
  position: absolute; bottom: 1.5rem; left: 50%; transform: translateX(-50%);
  display: flex; gap: 0.5rem; z-index: 3;
}
.sl-hero__dot {
  width: 10px; height: 10px; border-radius: 50%; border: 0; background: rgba(255,255,255,0.45); cursor: pointer;
}
.sl-hero__dot.is-active { background: white; }

/* Cards / grids */
.sl-grid { display: grid; gap: 1.5rem; }
.sl-grid--3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.sl-grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.sl-card {
  background: white; border: 1px solid var(--sl-gray-200); border-radius: var(--sl-radius);
  padding: 1.5rem; box-shadow: var(--sl-shadow);
}
.sl-card__icon {
  width: 48px; height: 48px; border-radius: 12px; margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--sl-blue-deep), var(--sl-blue));
  display: grid; place-items: center; color: white; font-size: 1.25rem;
}
.sl-card h3 { margin: 0 0 0.5rem; color: var(--sl-blue-deep); }
.sl-card p { margin: 0; color: var(--sl-gray-500); }

/* CTA band */
.sl-cta {
  background: linear-gradient(120deg, var(--sl-blue-deep), #145a9e 50%, var(--sl-blue));
  color: white; border-radius: 20px; padding: 3rem; text-align: center;
}
.sl-cta h2 { color: white; margin-top: 0; }
.sl-cta p { color: rgba(255,255,255,0.9); max-width: 36rem; margin: 0 auto 1.5rem; }

/* Footer */
.sl-footer { background: var(--sl-blue-deep); color: rgba(255,255,255,0.85); padding: 3rem 0 1.5rem; margin-top: 0; }
.sl-footer a { color: white; }
.sl-footer a:hover { color: var(--sl-blue); }
.sl-footer__grid { display: grid; gap: 2rem; grid-template-columns: 2fr 1fr 1fr 1fr; }
.sl-footer__bottom { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid rgba(255,255,255,0.15); font-size: 0.9rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; }
.sl-footer h4 { color: white; margin: 0 0 0.75rem; }
.sl-footer ul { list-style: none; padding: 0; margin: 0; }
.sl-footer li { margin-bottom: 0.4rem; }

/* Auth forms */
.sl-auth {
  min-height: calc(100vh - 80px);
  display: grid; place-items: center;
  background: linear-gradient(160deg, var(--sl-gray-50), #dbeafe 40%, var(--sl-gray-50));
  padding: 2rem 0;
}
.sl-auth__card {
  width: min(440px, 94vw); background: white; border-radius: 20px;
  box-shadow: var(--sl-shadow); padding: 2.25rem; border: 1px solid var(--sl-gray-200);
}
.sl-auth__card h1 { margin: 0 0 0.35rem; font-size: 1.75rem; color: var(--sl-blue-deep); }
.sl-auth__card .sl-muted { color: var(--sl-gray-500); margin-bottom: 1.5rem; }
.sl-field { margin-bottom: 1rem; }
.sl-field label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 0.35rem; color: var(--sl-gray-700); }
.sl-field input, .sl-field select, .sl-field textarea {
  width: 100%; padding: 0.75rem 0.9rem; border: 1px solid var(--sl-gray-200);
  border-radius: 10px; font: inherit; background: var(--sl-gray-50);
}
.sl-field input:focus, .sl-field select:focus, .sl-field textarea:focus {
  outline: 2px solid var(--sl-blue); border-color: transparent; background: white;
}
.sl-form-error { color: var(--sl-accent-red); font-size: 0.9rem; margin-bottom: 0.75rem; }
.sl-form-success { color: #0f7a3e; font-size: 0.9rem; margin-bottom: 0.75rem; }

/* Dashboard shell */
.sl-dash { display: grid; grid-template-columns: 260px 1fr; min-height: calc(100vh - 72px); }
.sl-dash__side {
  background: var(--sl-blue-deep); color: white; padding: 1.5rem 1rem;
}
.sl-dash__side a { display: block; color: rgba(255,255,255,0.85); padding: 0.65rem 0.85rem; border-radius: 8px; margin-bottom: 0.25rem; font-weight: 600; }
.sl-dash__side a:hover, .sl-dash__side a.is-active { background: rgba(255,255,255,0.12); color: white; }
.sl-dash__main { padding: 2rem; background: var(--sl-gray-50); }
.sl-stat {
  background: white; border-radius: var(--sl-radius); padding: 1.25rem; border: 1px solid var(--sl-gray-200);
}
.sl-stat strong { display: block; font-size: 1.75rem; color: var(--sl-blue-deep); }
.sl-badge {
  display: inline-block; padding: 0.2rem 0.55rem; border-radius: 999px;
  background: #e8f3ff; color: var(--sl-blue-deep); font-size: 0.75rem; font-weight: 700;
}
.sl-badge--red { background: #fdecea; color: var(--sl-accent-red); }

/* Blog / FAQ */
.sl-post-list article { padding: 1.5rem 0; border-bottom: 1px solid var(--sl-gray-200); }
.sl-post-list h2 { margin: 0 0 0.4rem; font-size: 1.35rem; }
.sl-faq details {
  background: white; border: 1px solid var(--sl-gray-200); border-radius: 12px;
  padding: 1rem 1.25rem; margin-bottom: 0.75rem;
}
.sl-faq summary { font-weight: 700; color: var(--sl-blue-deep); cursor: pointer; }
.sl-faq details[open] summary { margin-bottom: 0.5rem; }

/* CMS templates gallery */
.sl-template-card { overflow: hidden; padding: 0; }
.sl-template-card img { width: 100%; height: 180px; object-fit: cover; }
.sl-template-card__body { padding: 1.25rem; }

/* Institution template shells */
.tpl-nav { display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.tpl-hero {
  min-height: 420px; display: grid; place-items: center; text-align: center; color: white;
  background-size: cover; background-position: center; position: relative;
}
.tpl-hero > * { position: relative; z-index: 1; }
.tpl-hero::before { content: ""; position: absolute; inset: 0; background: rgba(11,58,110,0.55); }

@media (max-width: 860px) {
  .sl-footer__grid { grid-template-columns: 1fr 1fr; }
  .sl-dash { grid-template-columns: 1fr; }
  .sl-dash__side { display: flex; gap: 0.5rem; overflow-x: auto; }
  .sl-nav { display: none; }
  .sl-nav.is-open { display: flex; width: 100%; flex-direction: column; padding-bottom: 1rem; }
}