/* Dark-sky theme — opt-in per page with <body class="sky-theme">.
   Mirrors the Skivon app UI: deep navy skies, glass surfaces, light-blue accents.
   Loaded AFTER style.css, so it only overrides — style.css stays untouched for other apps. */

.sky-theme {
  --bg: #060B26;
  --card: rgba(255, 255, 255, 0.045);
  --ink: #EDF2FF;
  --muted: #9BA9C9;
  --border: rgba(255, 255, 255, 0.11);
  --accent: #82B1FF;
  --accent-ink: #06102A;
  --radius: 18px;
}

/* --- Sky backdrop: gradient + drifting star field + two soft glows --- */
body.sky-theme {
  background-color: var(--bg);
  background-image:
    radial-gradient(1100px 620px at 82% -8%, rgba(56, 120, 255, 0.30), transparent 60%),
    radial-gradient(900px 560px at 10% 105%, rgba(99, 60, 220, 0.28), transparent 62%),
    radial-gradient(circle at 18% 22%, rgba(255, 255, 255, 0.55) 1px, transparent 1.6px),
    radial-gradient(circle at 63% 11%, rgba(255, 255, 255, 0.40) 1px, transparent 1.6px),
    radial-gradient(circle at 84% 47%, rgba(255, 255, 255, 0.32) 1px, transparent 1.6px),
    radial-gradient(circle at 37% 63%, rgba(255, 255, 255, 0.28) 1px, transparent 1.6px),
    linear-gradient(180deg, #070C24 0%, #0B1435 45%, #060B26 100%);
  background-size: 100% 100%, 100% 100%, 340px 340px, 340px 340px, 340px 340px, 340px 340px, 100% 100%;
  background-attachment: fixed;
  animation: skivon-drift 140s linear infinite alternate;
}

@keyframes skivon-drift {
  from { background-position: 0 0, 0 0, 0 0, 68px 0, 34px 52px, 96px 24px, 0 0; }
  to   { background-position: 0 0, 0 0, 0 120px, 68px 120px, 34px 172px, 96px 144px, 0 0; }
}

@media (prefers-reduced-motion: reduce) {
  body.sky-theme { animation: none; }
}

.sky-theme ::selection { background: rgba(130, 177, 255, 0.32); }

/* --- Header --- */
.sky-theme .site-header {
  background: linear-gradient(135deg, #16255C 0%, #2B3A8F 45%, #4C3BCF 100%);
  box-shadow: 0 12px 40px rgba(4, 8, 24, 0.55);
}
.sky-theme .tagline { opacity: 0.85; }

/* --- Glass surfaces --- */
.sky-theme .card {
  background: var(--card);
  border: 1px solid var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 14px 40px rgba(3, 7, 22, 0.45);
}
.sky-theme .featured { border-left: 5px solid var(--accent); }
.sky-theme a { color: var(--accent); }

/* --- Typography bits --- */
.sky-theme code,
.sky-theme .meta code {
  background: rgba(130, 177, 255, 0.14);
  color: #CFE0FF;
  border: 1px solid rgba(130, 177, 255, 0.18);
  overflow-wrap: break-word;
}
.sky-theme .badge {
  background: rgba(130, 177, 255, 0.13);
  color: #BBD4FF;
  border: 1px solid rgba(130, 177, 255, 0.28);
}
.sky-theme hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 26px 0;
}

/* --- Tables --- */
.sky-theme th, .sky-theme td { border-bottom: 1px solid var(--border); }
.sky-theme th { background: rgba(255, 255, 255, 0.05); color: #DCE6FF; }
.sky-theme tbody tr:hover { background: rgba(255, 255, 255, 0.03); }

/* --- Callouts --- */
.sky-theme .toc {
  background: rgba(130, 177, 255, 0.07);
  border: 1px solid rgba(130, 177, 255, 0.22);
}
.sky-theme .toc a { text-decoration: none; border-bottom: 1px dotted rgba(130, 177, 255, 0.45); }
.sky-theme .toc a:hover { border-bottom-style: solid; }

.sky-theme .highlight {
  background: rgba(56, 189, 248, 0.10);
  border: 1px solid rgba(56, 189, 248, 0.30);
}
.sky-theme .warning {
  background: rgba(251, 191, 36, 0.09);
  border: 1px solid rgba(251, 191, 36, 0.28);
}
.sky-theme .sunrise {
  background: rgba(251, 146, 60, 0.10);
  border: 1px solid rgba(251, 146, 60, 0.30);
}

/* --- Buttons / icons --- */
.sky-theme .btn {
  background: rgba(255, 255, 255, 0.06);
  color: var(--ink);
  border-color: var(--border);
}
.sky-theme .btn.primary {
  background: linear-gradient(135deg, #82B1FF, #6C8BFF);
  color: var(--accent-ink);
  border-color: transparent;
}
.sky-theme .app-icon {
  background: linear-gradient(140deg, rgba(56, 120, 255, 0.35), rgba(99, 60, 220, 0.35));
  color: #EAF1FF;
  border: 1px solid rgba(255, 255, 255, 0.14);
}

/* --- Tables: stack into labelled cards on narrow screens (needs data-label on each <td>) --- */
@media (max-width: 640px) {
  .sky-theme table,
  .sky-theme tbody,
  .sky-theme tr,
  .sky-theme td { display: block; width: 100%; }
  .sky-theme thead { display: none; }
  .sky-theme table { font-size: .92em; }
  .sky-theme tr {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.035);
    padding: 10px 12px;
    margin-bottom: 12px;
  }
  .sky-theme td {
    border: 0;
    padding: 2px 0 10px;
    display: block;
  }
  .sky-theme td::before {
    content: attr(data-label);
    display: block;
    color: var(--muted);
    font-weight: 700;
    font-size: .8em;
    letter-spacing: .04em;
    text-transform: uppercase;
    margin-bottom: 3px;
  }
}