/* Simple Science — base styles
   System fonts only: no external requests, loads instantly. */

:root {
  --bg: #fbfaf8;
  --surface: #ffffff;
  --ink: #1c1e26;
  --ink-soft: #52565f;
  --border: #e6e3dd;
  --accent: #1f6f5c;       /* deep teal — links, headline accents */
  --accent-soft: #e7f2ef;
  --established: #1f6f5c;  /* confidence: well-established */
  --established-bg: #e7f2ef;
  --early: #9a6b00;        /* confidence: early evidence */
  --early-bg: #faf1dd;
  --preliminary: #a83e2c;  /* confidence: preliminary */
  --preliminary-bg: #f8e9e6;
  --max-width: 680px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

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

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.site-header .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-top: 22px;
  padding-bottom: 22px;
  flex-wrap: wrap;
  gap: 8px;
}
.logo {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.logo span { color: var(--accent); }
.tagline {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-left: 4px;
}
nav a {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin-left: 18px;
}
nav a:first-child { margin-left: 0; }

/* Article list (homepage) */
main { padding: 36px 0 64px; }

.article-card {
  display: block;
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
}
.article-card:hover .card-title { text-decoration: underline; }
.card-meta { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.card-date { font-size: 0.82rem; color: var(--ink-soft); }
.card-title {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.3rem;
  color: var(--ink);
  margin: 0 0 6px;
  line-height: 1.3;
}
.card-gist { color: var(--ink-soft); font-size: 0.98rem; margin: 0; }

/* Confidence badge */
.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.badge-established { color: var(--established); background: var(--established-bg); }
.badge-early { color: var(--early); background: var(--early-bg); }
.badge-preliminary { color: var(--preliminary); background: var(--preliminary-bg); }

/* Article page */
.article-header { padding: 40px 0 8px; }
.article-header h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  line-height: 1.25;
  margin: 14px 0 14px;
}
.byline {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.gist-box {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 16px 18px;
  margin: 24px 0 32px;
  font-size: 1.05rem;
}
.gist-box p { margin: 0; }
.gist-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-bottom: 6px;
}

article h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.3rem;
  margin: 34px 0 10px;
}
article p { margin: 0 0 14px; }

.confidence-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  margin: 10px 0 20px;
}

.source-box {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.back-link { display: inline-block; margin: 30px 0 10px; font-size: 0.9rem; }

/* About page */
.promise-list { padding-left: 20px; }
.promise-list li { margin-bottom: 10px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 26px 0 40px;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

@media (max-width: 480px) {
  .article-header h1 { font-size: 1.6rem; }
  .card-title { font-size: 1.15rem; }
}