assets/css/atmosphere.css:root {
  --bg: #0b0e14;
  --fg: #e6e6eb;
  --muted: #8a8f98;
  --accent: #9bbcff;
  --line: #1a1f2b;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont,
               "Segoe UI", Roboto, Inter, sans-serif;
  line-height: 1.7;
  letter-spacing: 0.02em;
}

body {
  max-width: 900px;
  margin: auto;
  padding: 5rem 2.5rem 6rem;
}

h1 {
  font-size: 2.4rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

p {
  max-width: 62ch;
  margin: 1.2rem 0;
}

ul {
  list-style: none;
  padding: 0;
  margin: 3rem 0;
}

li {
  margin: 0.9rem 0;
  font-size: 1.05rem;
}

a {
  color: var(--fg);
  text-decoration: none;
  position: relative;
}

a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0%;
  height: 1px;
  background: var(--accent);
  transition: width 0.25s ease;
}

a:hover::after {
  width: 100%;
}

hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 4rem 0;
}

small {
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

/* entrance calm */
body {
  animation: enter 0.8s ease-out;
}

@keyframes enter {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section {
  margin: 7rem 0;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

section:first-of-type {
  border-top: none;
  margin-top: 4rem;
}

h2 {
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}


/* --- Ark shell additions --- */
.gate {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

button.enter {
  margin-top: 2rem;
  padding: 0.9rem 1.2rem;
  border: 1px solid var(--line);
  background: transparent;
  color: inherit;
  font: inherit;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
}

button.enter:hover {
  border-color: var(--accent);
}

.hint {
  margin-top: 2rem;
}

.grid {
  list-style: none;
  padding: 0;
  margin: 2.5rem 0 0;
  display: grid;
  gap: 1.2rem;
}

.grid li small {
  display: block;
  margin-top: 0.3rem;
}

/* reveal */
section[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

section[data-reveal].visible {
  opacity: 1;
  transform: translateY(0);
}