/* Design DNA: underwater gradient hero + floating pill nav + depth calculator */
@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=Outfit:wght@400;500;600;700&display=swap');

:root {
  --da-ocean: #006994;
  --da-coral: #FF6B6B;
  --da-foam: #E8F4F8;
  --da-deep: #003D5B;
  --da-font-head: "Libre Baskerville", serif;
  --da-font-body: "Outfit", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body.da-body { font-family: var(--da-font-body); background: var(--da-foam); color: var(--da-deep); line-height: 1.65; }
img { max-width: 100%; display: block; }

.da-pill-nav {
  position: fixed;
  top: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  display: flex;
  gap: 0.25rem;
  padding: 0.4rem;
  background: rgba(255,255,255,0.9);
  border-radius: 999px;
  box-shadow: 0 8px 32px rgba(0,61,91,0.15);
}
.da-pill-nav a {
  text-decoration: none;
  color: var(--da-deep);
  padding: 0.55rem 1rem;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 500;
  opacity: 0.65;
}
.da-pill-nav a.da-on, .da-pill-nav a:hover { opacity: 1; background: var(--da-ocean); color: #fff; }

.da-hero {
  min-height: 100vh;
  background: linear-gradient(180deg, #87CEEB 0%, var(--da-ocean) 40%, var(--da-deep) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  padding: 6rem 4vw 4rem;
  position: relative;
  overflow: hidden;
}
.da-hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.da-hero-content { position: relative; z-index: 2; max-width: 640px; }
.da-hero h1 { font-family: var(--da-font-head); font-size: clamp(2.2rem, 5vw, 3.5rem); margin-bottom: 1rem; }

.da-depth-box {
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(12px);
  border-radius: 16px;
  padding: 1.5rem 2rem;
  margin-top: 2rem;
  max-width: 360px;
  margin-left: auto;
  margin-right: auto;
}
.da-depth-box input { width: 100%; accent-color: var(--da-coral); margin: 0.5rem 0; }
.da-depth-result { font-size: 1.5rem; font-weight: 700; color: var(--da-coral); margin-top: 0.5rem; }

.da-btn {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.85rem 1.5rem;
  background: var(--da-coral);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  border: none;
  cursor: pointer;
}

.da-section { padding: 4rem 4vw; }
.da-inner { max-width: 1100px; margin: 0 auto; }
.da-h2 { font-family: var(--da-font-head); font-size: 2rem; margin-bottom: 2rem; text-align: center; color: var(--da-ocean); }

.da-courses {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.da-course {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0,105,148,0.08);
}
.da-course img { aspect-ratio: 16/10; object-fit: cover; width: 100%; }
.da-course-body { padding: 1.25rem; }
.da-tag { display: inline-block; background: var(--da-foam); color: var(--da-ocean); padding: 0.2rem 0.6rem; border-radius: 4px; font-size: 0.75rem; font-weight: 600; }

.da-wave-divider {
  height: 60px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 60'%3E%3Cpath fill='%23E8F4F8' d='M0,30 Q300,60 600,30 T1200,30 L1200,60 L0,60 Z'/%3E%3C/svg%3E") center/cover no-repeat;
}

.da-contact { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.da-form input, .da-form textarea, .da-form select {
  width: 100%; padding: 0.75rem; margin-bottom: 0.75rem;
  border: 1px solid #cce; border-radius: 8px; font-family: inherit;
}
.da-form-msg { display: none; color: var(--da-ocean); }
.da-form-msg.da-show { display: block; }

.da-footer { background: var(--da-deep); color: rgba(255,255,255,0.75); text-align: center; padding: 2rem; font-size: 0.85rem; }

.da-cookie-bar {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--da-deep); color: #fff;
  padding: 1rem 4vw;
  transform: translateY(100%);
  transition: transform 0.35s;
  z-index: 400;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem;
}
.da-cookie-bar.da-show { transform: translateY(0); }

@media (max-width: 768px) {
  .da-courses, .da-contact { grid-template-columns: 1fr; }
  .da-pill-nav { flex-wrap: wrap; max-width: 95vw; justify-content: center; }
}