/* Aurora Forecast — base styles
   Palette: navy + aurora green
   Mobile-first, dark default
*/

:root {
  --bg: #0b0e1a;
  --bg-2: #11162a;
  --bg-3: #1a2138;
  --fg: #e7ecf5;
  --fg-2: #aab3c5;
  --fg-3: #6f7896;
  --accent: #34d399;   /* aurora green */
  --accent-2: #22d3ee;  /* cyan, for Bz south tip */
  --warn: #fbbf24;
  --bad: #ef4444;
  --border: #1f2640;
  --good-glow: rgba(52, 211, 153, 0.18);
  --bad-glow: rgba(239, 68, 68, 0.18);
  --warn-glow: rgba(251, 191, 36, 0.18);

  /* Night vision mode (toggle via JS) */
  --night-fg: #ff4d4d;
  --night-bg: #000;
}

/* Night vision mode */
body.night-vision {
  --bg: #000;
  --bg-2: #0a0000;
  --bg-3: #180000;
  --fg: #ff4d4d;
  --fg-2: #cc4040;
  --fg-3: #803333;
  --accent: #ff4d4d;
  --accent-2: #ff4d4d;
  --warn: #ff8080;
  --bad: #cc0000;
  --border: #330000;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Layout */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* Header */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 14, 26, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
.brand {
  font-weight: 700; font-size: 18px; color: var(--fg);
  text-decoration: none; display: flex; align-items: center; gap: 8px;
}
.brand .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); }
nav.primary a {
  color: var(--fg-2); text-decoration: none; font-size: 14px; margin-left: 18px;
}
nav.primary a:hover, nav.primary a:focus { color: var(--fg); }

/* Hero — the 16-second answer */
.hero {
  padding: 36px 0 20px;
  text-align: center;
}
.hero .eyebrow {
  font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--fg-3); margin-bottom: 8px;
}
.hero h1 {
  font-size: clamp(48px, 9vw, 96px);
  font-weight: 800; line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 8px 0 4px;
}
.hero h1.city {
  font-size: clamp(22px, 4vw, 32px); font-weight: 500;
  color: var(--fg-2); margin-bottom: 18px;
}
.hero .big-ans {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 14px;
  font-size: clamp(56px, 12vw, 128px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  margin: 4px 0 8px;
}
.hero .big-ans.go    { color: var(--good); text-shadow: 0 0 36px var(--good-glow); }
.hero .big-ans.maybe { color: var(--warn); text-shadow: 0 0 36px var(--warn-glow); }
.hero .big-ans.low   { color: #f59e0b; text-shadow: 0 0 28px var(--warn-glow); }
.hero .big-ans.no    { color: var(--bad);  text-shadow: 0 0 36px var(--bad-glow); }

.hero .subline {
  font-size: clamp(15px, 2.4vw, 18px);
  color: var(--fg-2);
  max-width: 580px;
  margin: 12px auto 22px;
}

/* Score bar (5 factors) */
.factors {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  max-width: 920px;
  margin: 14px auto 0;
  padding: 12px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.factor {
  text-align: center;
  padding: 10px 4px 8px;
}
.factor .num {
  font-size: 26px; font-weight: 800; line-height: 1.1;
  letter-spacing: -0.02em;
}
.factor .num.go { color: var(--accent); }
.factor .num.maybe { color: var(--warn); }
.factor .num.no { color: var(--bad); }
.factor .label {
  font-size: 11px; color: var(--fg-3);
  text-transform: uppercase; letter-spacing: 0.08em;
  margin-top: 4px;
}
.factor .weight {
  font-size: 10px; color: var(--fg-3);
}

@media (max-width: 640px) {
  .factors { grid-template-columns: repeat(2, 1fr); }
}

/* 7-night strip */
.nights {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  max-width: 920px;
  margin: 28px auto 0;
}
@media (max-width: 720px) {
  .nights { grid-template-columns: repeat(4, 1fr); }
}
.night {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 6px;
  text-align: center;
}
.night .dow { font-size: 11px; color: var(--fg-3); }
.night .day { font-size: 16px; font-weight: 700; margin: 2px 0 6px; }
.night .ans {
  font-size: 11px; font-weight: 700;
  padding: 3px 6px; border-radius: 6px; display: inline-block;
}
.night .ans.go { color: var(--good); background: var(--good-glow); }
.night .ans.maybe { color: var(--warn); background: var(--warn-glow); }
.night .ans.low { color: #f59e0b; background: var(--warn-glow); }
.night .ans.no { color: var(--bad); background: var(--bad-glow); }

/* Section header */
section h2 {
  font-size: 22px; font-weight: 700;
  margin: 36px 0 12px;
  letter-spacing: -0.01em;
}
section h2 .sub { font-size: 14px; color: var(--fg-3); font-weight: 400; margin-left: 8px; }

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 14px;
}
@media (max-width: 720px) {
  .cards { grid-template-columns: 1fr; }
}
.card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}
.card h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.card p { color: var(--fg-2); font-size: 14px; }

/* FAQ */
.faq details {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 8px;
}
.faq summary {
  cursor: pointer; font-weight: 600; color: var(--fg);
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--fg-3); font-weight: 400; }
.faq details[open] summary::after { content: "−"; }
.faq p { color: var(--fg-2); margin-top: 10px; font-size: 14px; }

/* SEO prose */
.prose {
  max-width: 720px;
  margin: 12px auto 0;
}
.prose p { color: var(--fg-2); margin-bottom: 12px; }
.prose h2 { font-size: 20px; margin: 24px 0 8px; }
.prose h3 { font-size: 16px; margin: 18px 0 6px; }

/* Footer */
footer.site {
  margin-top: 60px;
  padding: 30px 0;
  border-top: 1px solid var(--border);
  color: var(--fg-3);
  font-size: 13px;
}
footer.site .wrap { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; }
footer.site a { color: var(--fg-2); text-decoration: none; margin-left: 12px; }

/* CTA */
.cta-band {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin: 28px 0;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  flex-wrap: wrap;
}
.cta-band h3 { font-size: 18px; }
.cta-band p { color: var(--fg-2); font-size: 14px; margin-top: 4px; }
.cta-band .btn {
  display: inline-block; padding: 10px 18px; border-radius: 10px;
  background: var(--accent); color: #06231b; font-weight: 700;
  text-decoration: none; font-size: 14px;
}
.cta-band .btn:hover { filter: brightness(1.05); }

/* Skip-link for a11y */
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 10px; top: 10px; padding: 8px 12px; background: var(--accent); color: #000; }

/* Note: this `body` default enables dark mode by default.
   A light-mode toggle is intentionally NOT added — astronomy apps
   stay dark to preserve night vision. */