/* Stellly — astronomy field guide. Deep night-sky, star-gold accents. */
:root {
  --bg: #0b1026;          /* deep night sky */
  --bg-soft: #101630;
  --card: #141b38;
  --ink: #e8ecf5;         /* star white */
  --muted: #8b93b0;
  --accent: #e8b84b;      /* star gold */
  --accent-ink: #f2cf7a;
  --cyan: #5fc4d8;        /* telescope cyan */
  --line: #263059;
  --line-strong: #3a487a;
  --mono: "SF Mono", "Consolas", "Menlo", monospace;
  --serif: Georgia, "Times New Roman", serif;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  background-image: radial-gradient(1px 1px at 12% 18%, rgba(232,236,245,.55) 0 1px, transparent 1px),
                    radial-gradient(1px 1px at 68% 8%, rgba(232,236,245,.4) 0 1px, transparent 1px),
                    radial-gradient(1.5px 1.5px at 42% 30%, rgba(232,236,245,.35) 0 1.5px, transparent 1.5px),
                    radial-gradient(1px 1px at 84% 42%, rgba(232,236,245,.5) 0 1px, transparent 1px),
                    radial-gradient(1px 1px at 26% 55%, rgba(232,236,245,.3) 0 1px, transparent 1px),
                    radial-gradient(1.5px 1.5px at 92% 74%, rgba(232,236,245,.35) 0 1.5px, transparent 1.5px),
                    linear-gradient(180deg, #0b1026 0%, #0d1330 100%);
  line-height: 1.65;
}

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent); }

/* Header */
.site-header {
  background: rgba(11, 16, 38, .92);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(6px);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding-top: 14px; padding-bottom: 14px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.brand-mark { color: var(--accent); display: inline-flex; }
.brand-text { font-family: var(--serif); font-size: 22px; font-weight: 700; letter-spacing: .5px; line-height: 1; display: inline-flex; flex-direction: column; }
.brand-sub { font-family: var(--mono); font-size: 10px; font-weight: 400; letter-spacing: 2px; text-transform: uppercase; color: var(--muted); margin-top: 3px; }
.site-nav { display: flex; flex-wrap: wrap; gap: 4px; }
.nav-link { font-family: var(--mono); font-size: 12px; letter-spacing: .5px; text-transform: uppercase; padding: 6px 10px; color: var(--muted); text-decoration: none; border: 1px solid transparent; }
.nav-link:hover { border-color: var(--line-strong); color: var(--ink); }
.nav-link.is-active { border-color: var(--accent); color: var(--accent-ink); background: var(--bg-soft); }

/* Hero */
.hero { padding: 46px 0 30px; border-bottom: 1px solid var(--line); }
.hero-kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 3px; text-transform: uppercase; color: var(--cyan); margin-bottom: 12px; }
.hero-title { font-family: var(--serif); font-size: clamp(30px, 5vw, 46px); line-height: 1.1; font-weight: 700; max-width: 18ch; }
.hero-lede { max-width: 62ch; margin-top: 16px; color: var(--muted); font-size: 17px; }
.hero-rule { margin-top: 26px; height: 3px; background: repeating-linear-gradient(90deg, var(--accent) 0 16px, transparent 16px 24px); }

/* Sections */
.section-label { font-family: var(--mono); font-size: 12px; letter-spacing: 2px; text-transform: uppercase; color: var(--cyan); margin: 34px 0 14px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 22px; }
.chip { font-family: var(--mono); font-size: 12px; padding: 7px 12px; border: 1px solid var(--line-strong); color: var(--muted); text-decoration: none; background: var(--card); }
.chip:hover { border-color: var(--accent); color: var(--ink); }
.chip.is-active { background: var(--accent); border-color: var(--accent); color: #0b1026; }

/* Cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; padding-bottom: 50px; }
.ocard { background: var(--card); border: 1px solid var(--line); border-top: 2px solid var(--accent); }
.ocard-link { display: block; padding: 20px; text-decoration: none; color: var(--ink); height: 100%; }
.ocard-num { font-family: var(--mono); font-size: 11px; letter-spacing: 2px; color: var(--cyan); text-transform: uppercase; }
.ocard-title { font-family: var(--serif); font-size: 20px; line-height: 1.25; margin: 10px 0 8px; }
.ocard-link:hover .ocard-title { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 3px; }
.ocard-desc { font-size: 14px; color: var(--muted); margin-bottom: 16px; }
.ocard-meta { display: flex; flex-wrap: wrap; gap: 6px; }

.badge { font-family: var(--mono); font-size: 11px; letter-spacing: .4px; padding: 3px 7px; border: 1px solid var(--line-strong); color: var(--muted); background: var(--bg-soft); white-space: nowrap; }
.badge-key { color: var(--accent-ink); font-weight: 600; margin-right: 4px; }
.badge.b-type { border-color: var(--cyan); }
.badge.b-naked { border-color: var(--accent); }

/* Breadcrumb */
.crumb { font-family: var(--mono); font-size: 12px; color: var(--muted); margin: 22px 0 6px; }
.crumb a { color: var(--muted); text-decoration: none; }
.crumb a:hover { color: var(--accent-ink); text-decoration: underline; }
.crumb .sep { margin: 0 7px; color: var(--line-strong); }

/* Page titles */
.page-title { font-family: var(--serif); font-size: clamp(26px, 4vw, 38px); line-height: 1.15; font-weight: 700; margin: 8px 0 8px; }
.page-blurb { color: var(--muted); max-width: 62ch; margin-bottom: 8px; }

/* Guide (topic) */
.guide { max-width: 760px; margin: 0 auto 50px; }
.guide-head { border-bottom: 2px solid var(--accent); padding: 6px 0 18px; margin-bottom: 8px; }
.guide-title { font-family: var(--serif); font-size: clamp(26px, 4.5vw, 40px); line-height: 1.12; font-weight: 700; margin-bottom: 14px; }
.guide-badges { display: flex; flex-wrap: wrap; gap: 8px; }

.sec { padding: 20px 0; border-bottom: 1px solid var(--line); }
.sec-heading { font-family: var(--serif); font-size: 21px; margin-bottom: 12px; display: flex; align-items: baseline; gap: 10px; }
.sec-num { font-family: var(--mono); font-size: 13px; color: var(--accent); letter-spacing: 1px; }
.sec p { margin-bottom: 14px; }
.sec p:last-child { margin-bottom: 0; }

.guide-related { margin-top: 30px; }
.rel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.rel-card { display: block; border: 1px solid var(--line); background: var(--card); padding: 14px 16px; text-decoration: none; color: var(--ink); }
.rel-card:hover { border-color: var(--accent); }
.rel-card.is-drip { opacity: .55; border-style: dashed; }
.rel-title { display: block; font-family: var(--serif); font-size: 16px; }
.rel-meta { display: block; font-family: var(--mono); font-size: 11px; color: var(--muted); margin-top: 5px; letter-spacing: .4px; }

/* Legal */
.legal { max-width: 720px; margin: 0 auto 50px; }
.legal h2 { font-family: var(--serif); font-size: 20px; margin: 26px 0 10px; }
.legal p { margin-bottom: 14px; }

.notfound { padding: 50px 0 60px; }
.cta { display: inline-block; font-family: var(--mono); font-size: 13px; letter-spacing: 1px; text-transform: uppercase; background: var(--accent); color: #0b1026; padding: 11px 18px; text-decoration: none; margin-top: 18px; font-weight: 600; }
.cta:hover { background: var(--accent-ink); color: #0b1026; }

/* Footer */
.site-footer { background: rgba(11, 16, 38, .92); border-top: 1px solid var(--line); margin-top: 20px; padding: 34px 0 40px; }
.foot-brand { font-family: var(--serif); font-size: 17px; font-weight: 700; }
.foot-links { margin: 12px 0; font-size: 14px; }
.foot-links .dot { color: var(--line-strong); margin: 0 6px; }
.foot-note { font-size: 13px; color: var(--muted); max-width: 62ch; }

@media (max-width: 640px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .site-nav { gap: 2px; }
}