/* Birdwatch — backyard birdwatching guide. Field-notebook look (sky blue + warm brown). */
:root {
  --bg: #faf9f5;
  --bg-deep: #eef5f8;
  --ink: #2b3238;
  --ink-soft: #55606a;
  --line: #ccd8dd;
  --line-soft: #e2eaee;
  --sky: #3b7d9c;
  --sky-dark: #2c6178;
  --sky-soft: #7fb0c8;
  --brown: #8a6a45;
  --brown-dark: #6e5235;
  --cream: #fdfcf8;
  --s-year: #3b7d9c;
  --s-summer: #4c8a4c;
  --s-winter: #6f6fa0;
  --serif: Georgia, "Times New Roman", "Songti SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body.birdwatch {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  background-image: linear-gradient(90deg, rgba(59,125,156,0.03) 1px, transparent 1px);
  background-size: 26px 100%;
}

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

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

/* Header */
.site-header { border-bottom: 3px solid var(--sky); background: var(--cream); }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark { width: 34px; height: 34px; color: var(--sky); flex: 0 0 auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-family: var(--serif); font-weight: 700; font-size: 22px; }
.brand-tag { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.14em; color: var(--brown); }
.main-nav { display: flex; gap: 26px; }
.main-nav a { font-size: 14px; font-weight: 600; color: var(--ink-soft); }
.main-nav a:hover { color: var(--sky-dark); }

/* Hero */
.hero { padding: 56px 0 40px; background: linear-gradient(180deg, var(--bg-deep), var(--bg)); border-bottom: 1px solid var(--line); }
.hero-kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 0.22em; color: var(--brown); text-transform: uppercase; margin: 0 0 12px; }
.hero h1 { font-family: var(--serif); font-weight: 700; font-size: 42px; line-height: 1.12; margin: 0 0 16px; }
.hero-lede { font-size: 19px; line-height: 1.55; color: var(--ink-soft); max-width: 640px; margin: 0; }

.section-label { font-family: var(--mono); font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--brown-dark); margin: 0 0 18px; padding-bottom: 8px; border-bottom: 3px solid var(--sky); display: inline-block; }

/* Legend */
.legend { padding: 8px 20px 32px; }
.legend-list { list-style: none; margin: 0; padding: 0; display: flex; gap: 26px; flex-wrap: wrap; }
.legend-list li { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--ink-soft); }
.season-chip { display: inline-block; padding: 2px 10px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: #fff; }
.s-year { background: var(--s-year); }
.s-summer { background: var(--s-summer); }
.s-winter { background: var(--s-winter); }

/* Categories */
.category-nav { padding: 8px 20px 36px; }
.category-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 14px; }
.category-card { display: flex; flex-direction: column; gap: 6px; padding: 18px 16px; border: 1px solid var(--line); border-top: 3px solid var(--sky); background: var(--cream); color: var(--ink); }
.category-card:hover { border-color: var(--sky); text-decoration: none; background: #fff; }
.category-count { font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--brown); }
.category-name { font-family: var(--serif); font-weight: 700; font-size: 18px; }

/* Group sections */
.group-section { padding: 24px 20px 8px; }
.group-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 16px; }
.group-head h2 { font-family: var(--serif); font-size: 26px; font-weight: 700; margin: 0; }
.group-more { font-size: 13px; font-weight: 600; color: var(--brown); text-transform: uppercase; letter-spacing: 0.04em; }

/* Bird cards */
.bird-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.bird-card { display: flex; flex-direction: column; gap: 5px; padding: 16px; border: 1px solid var(--line); border-left: 4px solid var(--sky-soft); background: var(--cream); color: var(--ink); }
.bird-card:hover { border-color: var(--sky); text-decoration: none; background: #fff; }
.bird-card .season-chip { align-self: flex-start; }
.bird-title { font-family: var(--serif); font-weight: 700; font-size: 17px; line-height: 1.25; }
.bird-zh { font-size: 13px; color: var(--brown); }
.bird-size { font-family: var(--mono); font-size: 12px; color: var(--sky-dark); }
.bird-desc { font-size: 14px; color: var(--ink-soft); }

/* Page head */
.page-head { padding: 40px 20px 20px; }
.crumb { font-size: 13px; color: var(--ink-soft); margin: 0 0 10px; }
.crumb a { color: var(--brown); }
.page-head h1 { font-family: var(--serif); font-weight: 700; font-size: 36px; line-height: 1.15; margin: 0 0 8px; }
.zh-sub { font-size: 15px; color: var(--brown); margin: 0 0 4px; }
.lede { color: var(--ink-soft); font-size: 15px; margin: 0 0 16px; }

/* Entry layout */
.layout { display: grid; grid-template-columns: 300px 1fr; gap: 32px; padding: 8px 20px 48px; align-items: start; }

.fieldcard { position: sticky; top: 20px; border: 1px solid var(--line); border-top: 3px solid var(--sky); background: var(--cream); }
.fieldcard-head { display: flex; align-items: center; justify-content: space-between; background: var(--sky-dark); padding: 10px 14px; }
.fieldcard-head .season-chip { font-size: 12px; }
.fieldcard-label { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: #cfe4ee; }
.field-spec { margin: 0; padding: 6px 14px; }
.spec-row { display: flex; justify-content: space-between; gap: 10px; padding: 8px 0; border-bottom: 1px dotted var(--line-soft); }
.spec-row dt { font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--brown-dark); }
.spec-row dd { margin: 0; font-size: 14px; font-weight: 600; text-align: right; }
.side-title { font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--brown-dark); margin: 18px 14px 8px; }
.lookalikes { margin: 0 14px 18px; padding-left: 18px; font-size: 14px; color: var(--ink-soft); }
.lookalikes li { margin: 4px 0; }
.lookalikes li::marker { color: var(--sky); }

/* Prose */
.prose { font-size: 17px; line-height: 1.72; color: var(--ink); }
.prose h2 { font-family: var(--serif); font-weight: 700; font-size: 24px; line-height: 1.2; margin: 0 0 12px; padding-bottom: 6px; border-bottom: 3px solid var(--line); }
.sec { margin-bottom: 28px; }
.sec-num { display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; margin-right: 8px; font-family: var(--mono); font-size: 13px; color: #fff; background: var(--sky); }
.prose p { margin: 0 0 16px; }
.related-list { list-style: none; padding: 0; margin: 0; }
.related-list li { padding: 8px 0; border-bottom: 1px dotted var(--line-soft); }
.related-list a { font-size: 17px; font-weight: 600; }

.category-nav-inline { padding: 24px 20px 48px; }

/* Footer */
.site-footer { border-top: 3px solid var(--sky); background: var(--bg-deep); margin-top: 24px; }
.footer-inner { display: flex; flex-direction: column; gap: 14px; padding: 32px 20px 40px; }
.footer-brand .brand-name { font-family: var(--serif); font-size: 20px; font-weight: 700; }
.footer-brand p { margin: 4px 0 0; color: var(--ink-soft); font-size: 14px; }
.footer-nav { display: flex; gap: 22px; }
.footer-nav a { font-size: 13px; color: var(--ink-soft); text-transform: uppercase; }
.copyright { font-size: 13px; color: var(--ink-soft); margin: 0; }

@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
  .fieldcard { position: static; }
  .hero h1 { font-size: 32px; }
  .page-head h1 { font-size: 28px; }
  .main-nav { gap: 16px; }
}