/* ============================================================================
   DiveOpsHub — Design System
   Kleuren: water van diepzee (#0A1828) tot schuim (#F7F9FB)
   Accent:  #F2A541 (signaal)
   Fonts:   Fraunces (display) + Inter (body) + JetBrains Mono (data)
   ============================================================================ */

:root {
  /* Diepte-palet */
  --abyss:      #0A1828;
  --deep:       #13293D;
  --ocean:      #1B4965;
  --surface:    #5FA8D3;
  --shallow:    #BEE9E8;
  --foam:       #F7F9FB;

  /* Accent */
  --signal:     #F2A541;
  --signal-dark:#D98324;
  --coral:      #E63946;

  /* Neutraal */
  --ink:        #0F1A24;
  --slate-900:  #1E2A38;
  --slate-700:  #3D4F63;
  --slate-500:  #6B7F94;
  --slate-300:  #B8C5D1;
  --slate-100:  #E8EEF4;
  --white:      #FFFFFF;

  /* Layout */
  --radius:     10px;
  --radius-lg:  16px;
  --radius-sm:  6px;

  --shadow-sm:  0 1px 2px rgba(10,24,40,.06), 0 1px 3px rgba(10,24,40,.08);
  --shadow-md:  0 4px 6px rgba(10,24,40,.07), 0 10px 20px rgba(10,24,40,.1);
  --shadow-lg:  0 20px 40px rgba(10,24,40,.15), 0 30px 60px rgba(10,24,40,.12);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--foam);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--abyss);
}

code, .mono, .tabular {
  font-family: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', monospace;
  font-variant-numeric: tabular-nums;
}

a { color: var(--ocean); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--signal-dark); }

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

/* Layout utilities */
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.container-narrow { max-width: 780px; margin: 0 auto; padding: 0 32px; }

/* Top navigatie */
.topnav {
  background: var(--abyss);
  color: var(--foam);
  padding: 16px 0;
  position: sticky; top: 0; z-index: 50;
  box-shadow: 0 1px 0 rgba(255,255,255,.05);
}
.topnav .container { display: flex; align-items: center; justify-content: space-between; }
.topnav-logo { display: flex; align-items: center; gap: 10px; }
.topnav-logo svg { width: 32px; height: 32px; }
.topnav-logo-text {
  font-family: 'Fraunces', serif; font-size: 20px; font-weight: 500;
  color: var(--foam);
}
.topnav-logo-text span { color: var(--signal); font-style: italic; }
.topnav-links { display: flex; gap: 28px; align-items: center; }
.topnav-links a { color: var(--slate-300); font-size: 14px; font-weight: 500; }
.topnav-links a:hover { color: var(--foam); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 14px;
  border: none;
  cursor: pointer;
  transition: all .2s ease;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--signal);
  color: var(--abyss);
}
.btn-primary:hover {
  background: var(--signal-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: var(--abyss);
}
.btn-secondary {
  background: var(--ocean);
  color: var(--foam);
}
.btn-secondary:hover {
  background: var(--deep);
  color: var(--foam);
}
.btn-ghost {
  background: transparent;
  color: var(--foam);
  border: 1px solid rgba(255,255,255,.2);
}
.btn-ghost:hover {
  background: rgba(255,255,255,.08);
  color: var(--foam);
}
.btn-lg { padding: 14px 28px; font-size: 16px; }

/* Cards */
.card {
  background: var(--white);
  border: 1px solid var(--slate-100);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform .2s ease, box-shadow .2s ease;
}
.card-hover:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Forms */
.form-group { margin-bottom: 18px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--slate-700);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--slate-300);
  border-radius: var(--radius-sm);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--surface);
  box-shadow: 0 0 0 3px rgba(95,168,211,.15);
}
.form-hint { font-size: 12px; color: var(--slate-500); margin-top: 4px; }
.form-error { color: var(--coral); font-size: 13px; margin-top: 4px; }

/* Eyebrow labels */
.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--signal-dark);
  font-weight: 500;
}
.eyebrow-dark { color: var(--shallow); }

/* Footer */
.site-footer {
  background: var(--abyss);
  color: var(--slate-300);
  padding: 60px 0 32px;
  margin-top: 80px;
}
.site-footer .container { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.site-footer h4 {
  color: var(--foam);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  font-weight: 600;
}
.site-footer a { color: var(--slate-300); font-size: 14px; display: block; padding: 4px 0; }
.site-footer a:hover { color: var(--foam); }
.footer-bottom {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-size: 12px;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.1em;
  color: var(--slate-500);
  text-align: center;
}

/* Responsive */
@media (max-width: 900px) {
  .topnav-links { gap: 16px; }
  .topnav-links a:not(.btn) { display: none; }
  .site-footer .container { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .site-footer .container { grid-template-columns: 1fr; }
  h1 { font-size: 32px !important; }
}