* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  color: #111827;
  background:
    linear-gradient(rgba(15, 23, 42, 0.68), rgba(15, 23, 42, 0.68)),
    url('media/hero.jpg') center / cover fixed no-repeat;
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(255,255,255,0.88);
  border-bottom: 1px solid rgba(255,255,255,0.35);
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  text-decoration: none;
  color: #111827;
  font-weight: 700;
}

.brand-icon {
  width: 3rem;
  height: 3rem;
  object-fit: contain;
  border-radius: 0.75rem;
}

.brand-text {
  font-size: 1.05rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav a {
  color: #374151;
  text-decoration: none;
  font-weight: 500;
}

.has-menu {
  position: relative;
}

.menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  min-width: 220px;
  padding: 0.75rem;
  border: 1px solid #e5e7eb;
  border-radius: 1rem;
  background: rgba(255,255,255,0.96);
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  display: none;
}

.has-menu:hover .menu {
  display: grid;
}

.hero {
  min-height: 72vh;
  display: grid;
  place-items: center;
  padding: 7rem 1.5rem 5rem;
  text-align: center;
  color: #fff;
}

.hero-inner,
.section-inner {
  width: min(100%, 1100px);
  margin: 0 auto;
}

.hero-inner {
  max-width: 900px;
}

.narrow {
  width: min(100%, 860px);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 700;
  color: #2563eb;
}

.hero .eyebrow {
  color: #bfdbfe;
}

h1 {
  margin: 0.5rem 0 1rem;
  font-size: clamp(2.5rem, 6vw, 5rem);
  line-height: 1;
}

.hero-copy {
  width: min(100%, 760px);
  margin: 0 auto 2rem;
  font-size: 1.1rem;
  color: rgba(255,255,255,0.9);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.4rem;
  border-radius: 999px;
  background: #111827;
  color: #fff;
  text-decoration: none;
  font-weight: 600;
}

.hero .button {
  background: #fff;
  color: #111827;
}

.button.secondary {
  background: #dc2626;
  color: #fff;
}

.section {
  padding: 5rem 1.5rem;
}

.section-inner {
  padding: 2.5rem;
  border-radius: 1.75rem;
  background: rgba(255,255,255,0.9);
  border: 1px solid rgba(255,255,255,0.35);
  box-shadow: 0 24px 80px rgba(0,0,0,0.18);
  backdrop-filter: blur(12px);
}

.course-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem;
  border-radius: 1.5rem;
  background: rgba(255,255,255,0.86);
  border: 1px solid #e5e7eb;
}

.course-card h3 {
  margin: 0.25rem 0;
  font-size: 1.75rem;
}

.text-link {
  white-space: nowrap;
  color: #2563eb;
  font-weight: 600;
  text-decoration: none;
}

.video-frame {
  overflow: hidden;
  border-radius: 1.5rem;
  border: 1px solid #e5e7eb;
  aspect-ratio: 16 / 9;
  margin: 2rem 0;
}

.video-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.site-footer {
  padding: 2rem;
  text-align: center;
  color: rgba(255,255,255,0.8);
}

@media (max-width: 768px) {
  body {
    background-attachment: scroll;
  }

  .site-header,
  .site-nav,
  .course-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero {
    min-height: 64vh;
    padding-top: 5rem;
  }

  .section-inner {
    padding: 1.5rem;
  }
}