/* NanoPool — micro aquarium guide. Underwater look (deep teal + cyan). */
:root {
  --bg: #f4fafb;
  --bg-deep: #e6f3f5;
  --ink: #16252b;
  --ink-soft: #3f5660;
  --line: #bfdadd;
  --line-soft: #dcebef;
  --teal: #0f7d8a;
  --teal-dark: #0b5e68;
  --cyan: #1ba0b5;
  --cyan-soft: #7fd4de;
  --deep: #0e2f42;
  --sand: #e8c98a;
  --care-beginner: #2e8b57;
  --care-moderate: #c98a2d;
  --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.nanopool {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  background-image:
    linear-gradient(rgba(15,125,138,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15,125,138,0.035) 1px, transparent 1px);
  background-size: 26px 26px;
}

a { color: var(--teal-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(--teal); background: var(--bg-deep); }
.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(--teal); flex: 0 0 auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-weight: 800; font-size: 21px; letter-spacing: -0.01em; }
.brand-tag { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.14em; color: var(--teal-dark); }
.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(--teal-dark); }

/* Hero */
.hero { padding: 56px 0 40px; background: linear-gradient(180deg, var(--deep), var(--teal-dark)); color: #eef7f8; }
.hero-kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 0.22em; color: var(--cyan-soft); text-transform: uppercase; margin: 0 0 12px; }
.hero h1 { font-weight: 800; font-size: 42px; line-height: 1.1; margin: 0 0 16px; letter-spacing: -0.01em; }
.hero-lede { font-size: 19px; line-height: 1.55; color: #d6eaee; max-width: 640px; margin: 0; }

.section-label { font-family: var(--mono); font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--teal-dark); margin: 0 0 18px; padding-bottom: 8px; border-bottom: 3px solid var(--cyan); 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); }
.care-chip { display: inline-block; padding: 2px 10px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: #fff; }
.care-beginner { background: var(--care-beginner); }
.care-moderate { background: var(--care-moderate); }

/* 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: 4px solid var(--teal); background: #fff; color: var(--ink); }
.category-card:hover { border-color: var(--teal); text-decoration: none; background: #fbfeff; }
.category-count { font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--teal-dark); }
.category-name { font-weight: 800; 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-size: 25px; font-weight: 800; margin: 0; }
.group-more { font-size: 13px; font-weight: 600; color: var(--teal-dark); text-transform: uppercase; letter-spacing: 0.04em; }

/* Stock cards */
.stock-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.stock-card { display: flex; flex-direction: column; gap: 5px; padding: 16px; border: 1px solid var(--line); border-top: 4px solid var(--cyan-soft); background: #fff; color: var(--ink); }
.stock-card:hover { border-color: var(--teal); text-decoration: none; background: #fbfeff; }
.stock-card .care-chip { align-self: flex-start; }
.stock-title { font-weight: 800; font-size: 17px; line-height: 1.25; }
.stock-zh { font-size: 13px; color: var(--teal-dark); }
.stock-size { font-family: var(--mono); font-size: 12px; color: var(--teal-dark); }
.stock-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(--teal-dark); }
.page-head h1 { font-size: 36px; font-weight: 800; line-height: 1.15; margin: 0 0 8px; }
.zh-sub { font-size: 15px; color: var(--teal-dark); 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; }

.carecard { position: sticky; top: 20px; border: 1px solid var(--line); border-top: 4px solid var(--teal); background: #fff; }
.carecard-head { display: flex; align-items: center; justify-content: space-between; background: var(--deep); padding: 10px 14px; }
.carecard-head .care-chip { font-size: 12px; }
.carecard-label { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: #bfe6ec; }
.care-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(--teal-dark); }
.spec-row dd { margin: 0; font-size: 14px; font-weight: 600; text-align: right; }

/* Prose */
.prose { font-size: 17px; line-height: 1.72; color: var(--ink); }
.prose h2 { font-size: 24px; font-weight: 800; 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(--teal); }
.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(--teal); 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-size: 20px; font-weight: 800; }
.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; }
  .carecard { position: static; }
  .hero h1 { font-size: 32px; }
  .page-head h1 { font-size: 28px; }
  .main-nav { gap: 16px; }
}