/* Je Binnenwereld: dark page with the blue of the logo; no external fonts or scripts */
:root {
  --bg: #000;
  --bg-soft: #10131b;
  --text: #e6e8ee;
  --muted: #a4abbb;
  --blue: #1b5fa8;       /* the blue of the title in the photo */
  --blue-light: #6fb0ee; /* readable on black: links and headings */
  --line: #232838;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 18px/1.65 Georgia, 'Times New Roman', serif;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--blue-light); }
a:hover, a:focus { color: #fff; }
img { max-width: 100%; height: auto; }

.wrap { width: min(100% - 2rem, 62rem); margin-inline: auto; }
.narrow { width: min(100% - 2rem, 42rem); margin-inline: auto; }

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(0, 0, 0, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.25rem 1.5rem; padding: 0.6rem 0; }
.brand { color: var(--blue-light); font-weight: bold; font-size: 1.15rem; text-decoration: none; }
.topbar ul { display: flex; flex-wrap: wrap; gap: 0.1rem 1.1rem; list-style: none; margin: 0; padding: 0; }
.topbar nav a { color: var(--text); text-decoration: none; font-size: 0.95rem; }
.topbar nav a:hover, .topbar nav a:focus { color: var(--blue-light); text-decoration: underline; }

/* Hero */
.hero { text-align: center; padding: 1.5rem 0 0.5rem; }
.hero img { width: min(520px, 90vw); display: block; margin: 0 auto; }

/* Text */
.intro { text-align: center; padding-top: 1rem; }
.lead { font-size: 1.25rem; font-style: italic; color: var(--blue-light); }

h1, h2, h3 { line-height: 1.25; font-weight: normal; }
h2 { font-size: 1.9rem; color: var(--blue-light); margin: 3rem 0 1rem; padding-top: 2rem; border-top: 1px solid var(--line); }
h3 { font-size: 1.3rem; color: #fff; margin: 2rem 0 0.5rem; }
ul { padding-left: 1.3rem; }
li { margin: 0.25rem 0; }

.sign { margin-top: 2rem; font-style: italic; color: var(--muted); }

.site-footer { margin-top: 4rem; padding: 1.5rem 0; background: var(--bg-soft); color: var(--muted); font-size: 0.9rem; text-align: center; }
.site-footer p { margin: 0; }

@media (max-width: 640px) {
  body { font-size: 17px; }
  h2 { font-size: 1.6rem; }
  .topbar ul { gap: 0.1rem 0.9rem; }
}

/* Contact form */
.outOfSight { position: absolute; left: -4000px; top: 0; }
.contact-form label { display: block; margin: 1.1rem 0 0.25rem; color: var(--muted); font-size: 0.95rem; }
.contact-form input, .contact-form textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 4px;
  font: inherit;
}
.contact-form input:focus, .contact-form textarea:focus { outline: 2px solid var(--blue); border-color: var(--blue-light); }
.contact-form button {
  margin-top: 1.4rem;
  padding: 0.65rem 1.6rem;
  background: var(--blue);
  color: #fff;
  border: 0;
  border-radius: 4px;
  font: inherit;
  cursor: pointer;
}
.contact-form button:hover, .contact-form button:focus { background: #2371c4; }
.error { color: #ff8a8a; }
.ok { color: #8fe0a8; }
.contact-form button:disabled { opacity: 0.6; cursor: default; }