/* ================================================================
   VER — Datetime Versioning Schemes
   Celestial almanac aesthetic
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant:ital,wght@0,400;0,600;0,700;1,400&family=JetBrains+Mono:wght@300;400;500&family=Outfit:wght@300;400;500;600&display=swap');

:root {
  --void:      #222c33;
  --n2:        #29333e;
  --n3:        #313f4c;
  --n4:        #6a8090;
  --n5:        #ccd6e0;
  --n6:        #edf1f5;

  --sun:       #f0a030;
  --sun-dim:   #f0a03020;
  --moon:      #9966ff;
  --moon-dim:  #9966ff20;
  --bin:       #2a9d8f;
  --bin-dim:   #2a9d8f20;

  --accent:    var(--n5);
  --accent-dim:#ccd6e010;

  --font-display: "Cormorant", Georgia, serif;
  --font-body:    "Outfit", system-ui, sans-serif;
  --font-mono:    "JetBrains Mono", monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scrollbar-color: var(--n3) var(--void);
}

body {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--n5);
  background: var(--void);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Starfield */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 25% 55%, rgba(255,255,255,0.25), transparent),
    radial-gradient(1.5px 1.5px at 40% 10%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 55% 75%, rgba(255,255,255,0.2), transparent),
    radial-gradient(1px 1px at 70% 30%, rgba(255,255,255,0.35), transparent),
    radial-gradient(1.5px 1.5px at 85% 60%, rgba(255,255,255,0.45), transparent),
    radial-gradient(1px 1px at 15% 80%, rgba(255,255,255,0.15), transparent),
    radial-gradient(1px 1px at 90% 15%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 35% 90%, rgba(255,255,255,0.2), transparent),
    radial-gradient(1.5px 1.5px at 60% 45%, rgba(255,255,255,0.35), transparent),
    radial-gradient(1px 1px at 5% 50%, rgba(255,255,255,0.25), transparent),
    radial-gradient(1px 1px at 78% 85%, rgba(255,255,255,0.2), transparent),
    radial-gradient(1px 1px at 48% 35%, rgba(255,255,255,0.15), transparent),
    radial-gradient(1.5px 1.5px at 92% 42%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 20% 95%, rgba(255,255,255,0.2), transparent);
}

/* Grain */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.03;
  z-index: 50;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* ================================================================
   NAV
   ================================================================ */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 28px;
  background: rgba(34,44,51,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--n3);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
}

nav a {
  color: var(--n4);
  text-decoration: none;
  padding: 4px 10px;
  border-radius: 4px;
  transition: color 0.2s, background 0.2s;
}

nav a:hover { color: var(--n5); background: var(--n3); }
nav a.active { color: var(--accent); background: var(--accent-dim); }

nav .sep { color: var(--n3); margin: 0 2px; user-select: none; }
nav .home { font-weight: 500; color: var(--n5); letter-spacing: 0.5px; }

/* ================================================================
   LAYOUT
   ================================================================ */
main {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  padding: 100px 28px 120px;
}

section { margin-bottom: 72px; }
section:last-child { margin-bottom: 0; }

/* ================================================================
   TYPOGRAPHY
   ================================================================ */
h1 {
  font-family: var(--font-display);
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--n6);
  letter-spacing: -1px;
  margin-bottom: 20px;
}

h1 .accent { color: var(--accent); }

h2 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 600;
  color: var(--n6);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--n3);
}

h3 {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--n4);
  margin-bottom: 12px;
}

p { margin-bottom: 16px; }
p:last-child { margin-bottom: 0; }

.lead {
  font-size: 20px;
  font-weight: 300;
  color: var(--n4);
  line-height: 1.6;
  max-width: 600px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ================================================================
   HERO
   ================================================================ */
.hero {
  margin-bottom: 80px;
  padding-top: 20px;
}

.hero .subtitle {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  color: var(--n4);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

/* ================================================================
   SCHEME CARDS (index)
   ================================================================ */
.schemes {
  display: grid;
  gap: 20px;
}

.scheme-card {
  background: var(--n2);
  border: 1px solid var(--n3);
  border-radius: 8px;
  padding: 32px;
  text-decoration: none;
  transition: border-color 0.3s, transform 0.2s, box-shadow 0.3s;
  display: block;
}

.scheme-card:hover {
  transform: translateY(-2px);
  text-decoration: none;
}

.scheme-card[data-scheme="sun"] { border-left: 3px solid var(--sun); }
.scheme-card[data-scheme="sun"]:hover { border-color: var(--sun); box-shadow: 0 8px 32px rgba(240,160,48,0.1); }
.scheme-card[data-scheme="moon"] { border-left: 3px solid var(--moon); }
.scheme-card[data-scheme="moon"]:hover { border-color: var(--moon); box-shadow: 0 8px 32px rgba(153,102,255,0.1); }
.scheme-card[data-scheme="bin"] { border-left: 3px solid var(--bin); }
.scheme-card[data-scheme="bin"]:hover { border-color: var(--bin); box-shadow: 0 8px 32px rgba(42,157,143,0.1); }

.scheme-card .card-name {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 4px;
}

.scheme-card[data-scheme="sun"] .card-name { color: var(--sun); }
.scheme-card[data-scheme="moon"] .card-name { color: var(--moon); }
.scheme-card[data-scheme="bin"] .card-name { color: var(--bin); }

.scheme-card .card-tagline {
  font-size: 15px;
  color: var(--n4);
  margin-bottom: 16px;
}

.scheme-card .card-spec {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--n5);
  background: var(--void);
  padding: 10px 14px;
  border-radius: 4px;
  margin-bottom: 16px;
}

.card-meta {
  display: flex;
  gap: 24px;
  font-size: 13px;
  color: var(--n4);
  font-family: var(--font-mono);
}

.card-meta span { display: flex; align-items: center; gap: 6px; }
.card-meta .label { color: var(--n4); }
.card-meta .value { color: var(--n5); }

/* ================================================================
   FORMULA BOX
   ================================================================ */
.formula {
  background: var(--n2);
  border: 1px solid var(--n3);
  border-radius: 8px;
  padding: 28px 32px;
  margin: 24px 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 2;
  color: var(--n5);
}

.formula .comment {
  color: var(--n4);
  font-size: 13px;
}

.formula .highlight { color: var(--accent); font-weight: 500; }

/* ================================================================
   TABLE
   ================================================================ */
.table-wrap {
  overflow-x: auto;
  margin: 24px 0;
  border-radius: 8px;
  border: 1px solid var(--n3);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  font-family: var(--font-mono);
}

thead {
  background: var(--n2);
}

th {
  text-align: left;
  padding: 12px 16px;
  font-weight: 500;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--n4);
  border-bottom: 1px solid var(--n3);
}

td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--n3);
  color: var(--n5);
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,0.02); }

td.version { font-weight: 500; color: var(--accent); }

/* ================================================================
   CONVERTER
   ================================================================ */
.converter {
  background: var(--n2);
  border: 1px solid var(--n3);
  border-radius: 8px;
  padding: 28px 32px;
  margin: 24px 0;
}

.converter-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.converter label {
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--n4);
  min-width: 80px;
}

.converter input[type="datetime-local"],
.converter input[type="text"] {
  font-family: var(--font-mono);
  font-size: 16px;
  padding: 8px 14px;
  border-radius: 4px;
  border: 1px solid var(--n3);
  background: var(--void);
  color: var(--n5);
  outline: none;
  transition: border-color 0.2s;
}

.converter input:focus { border-color: var(--accent); }

.converter .result {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 500;
  color: var(--accent);
  margin-top: 16px;
  letter-spacing: 1px;
}

.converter .decoded {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--n4);
  margin-top: 4px;
}

/* ================================================================
   COMPARISON TABLE (index)
   ================================================================ */
.comparison td:first-child { font-weight: 500; }
.comparison .sun { color: var(--sun); }
.comparison .moon { color: var(--moon); }
.comparison .bin { color: var(--bin); }

/* ================================================================
   CONSTRAINTS
   ================================================================ */
.constraint-box {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.constraint {
  background: var(--n2);
  border: 1px solid var(--n3);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
}

.constraint .component {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
}

.constraint .range {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--n4);
  margin-top: 4px;
}

.constraint .maps-to {
  font-size: 14px;
  color: var(--n5);
  margin-top: 8px;
}

/* ================================================================
   NOTES
   ================================================================ */
.note {
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  background: var(--accent-dim);
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
  font-size: 15px;
}

/* ================================================================
   FOOTER
   ================================================================ */
footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 40px 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--n4);
  border-top: 1px solid var(--n3);
  max-width: 820px;
  margin: 0 auto;
}

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 600px) {
  main { padding: 80px 16px 80px; }
  .scheme-card { padding: 20px; }
  .formula { padding: 16px; font-size: 13px; }
  .converter { padding: 16px; }
  .converter .result { font-size: 22px; }
  .constraint-box { grid-template-columns: 1fr; }
  nav { padding: 10px 16px; font-size: 12px; }
  .card-meta { flex-direction: column; gap: 8px; }
}