/* RCH Watch — light, high-readability theme.
   Links are blue in every state (never purple); button text is pinned. */

:root {
  --bg: #fbfbf9;
  --surface: #ffffff;
  --text: #161616;
  --muted: #5b6168;
  --border: #e3e3dd;
  --link: #1558d6;
  --link-hover: #0f3fa0;
  --accent: #0b4f6c;
  --good: #1b7f4b;
  --warn: #b06a00;
  --bad: #b3261e;
  --maxw: 1080px;
  --radius: 10px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Links — identical color in all states, never purple. */
a, a:link, a:visited { color: var(--link); text-decoration: none; }
a:hover, a:active, a:focus { color: var(--link-hover); text-decoration: underline; }

h1, h2, h3 { line-height: 1.25; color: var(--text); margin: 1.4em 0 .5em; }
h1 { font-size: 1.9rem; margin-top: .6em; }
h2 { font-size: 1.4rem; border-bottom: 2px solid var(--border); padding-bottom: .25em; }
h3 { font-size: 1.12rem; }
p { margin: .6em 0; }
.muted { color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.num { text-align: right; font-variant-numeric: tabular-nums; }

/* Nav */
.site-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 20;
}
.site-nav .wrap { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; min-height: 56px; }
.site-nav .brand { font-weight: 800; font-size: 1.15rem; color: var(--accent); letter-spacing: .2px; }
.site-nav .brand:hover { text-decoration: none; }
.site-nav nav { display: flex; gap: 4px; flex-wrap: wrap; margin-left: auto; }
.site-nav nav a {
  padding: 7px 12px; border-radius: 7px; color: var(--text); font-weight: 600; font-size: .95rem;
}
.site-nav nav a:hover { background: #eef2fb; color: var(--link-hover); text-decoration: none; }
.site-nav nav a.active { background: var(--accent); color: #fff; }

/* Breadcrumbs */
.crumbs { font-size: .85rem; color: var(--muted); margin: 18px 0 4px; }
.crumbs .sep { color: var(--border); }
.crumbs span[aria-current] { color: var(--text); font-weight: 600; }

/* Hero */
.hero { padding: 28px 0 8px; }
.hero h1 { margin-top: .2em; }
.hero .lede { font-size: 1.15rem; color: var(--muted); max-width: 60ch; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 18px 0 6px; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 8px; font-weight: 700;
  background: var(--accent); color: #ffffff !important; border: 1px solid var(--accent);
}
.btn:hover { background: var(--link-hover); border-color: var(--link-hover); color: #fff !important; text-decoration: none; }
.btn.secondary { background: var(--surface); color: var(--accent) !important; border-color: var(--border); }
.btn.secondary:hover { background: #eef2fb; color: var(--link-hover) !important; }

/* Metric cards */
.metric-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(165px, 1fr)); gap: 14px; margin: 18px 0; }
.metric { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.metric-value { font-size: 1.7rem; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; }
.metric-label { font-size: .82rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; margin-top: 2px; }
.metric-sub { font-size: .82rem; color: var(--muted); margin-top: 4px; }

/* Cards / sections */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin: 14px 0; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
.card h3 { margin-top: 0; }
.list-rank { list-style: none; padding: 0; margin: 0; }
.list-rank li { display: flex; justify-content: space-between; gap: 10px; padding: 6px 0; border-bottom: 1px solid var(--border); }
.list-rank li:last-child { border-bottom: 0; }
.list-rank .v { color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: .92rem; }
table.flights th, table.flights td { padding: 9px 12px; border-bottom: 1px solid var(--border); white-space: nowrap; text-align: left; }
table th { background: #f4f5f1; font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); }
table td.num, table th.num { text-align: right; font-variant-numeric: tabular-nums; }
table tbody tr:hover { background: #f7f9ff; }

/* Confidence badges */
.conf { display: inline-block; font-size: .74rem; font-weight: 700; padding: 1px 7px; border-radius: 999px; border: 1px solid transparent; }
.conf-confirmed { background: #e6f4ec; color: var(--good); border-color: #bfe3cd; }
.conf-likely    { background: #eaf1fc; color: var(--link); border-color: #c8d9f5; }
.conf-approx    { background: #fbf2e0; color: var(--warn); border-color: #ecd9ad; }
.conf-signal_lost { background: #f1eef9; color: #6b43c9; border-color: #d8cdef; }
.conf-open_ocean  { background: #eef0f2; color: var(--muted); border-color: #dadde0; }

/* Charts */
.chart { width: 100%; height: auto; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.chart .area { fill: rgba(21,88,214,.12); stroke: none; }
.chart .line { fill: none; stroke: var(--link); stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.chart .dot { fill: var(--link); }
.chart .grid { stroke: var(--border); stroke-width: 1; }
.chart .ax { fill: var(--muted); font-size: 11px; }
.chart-title { fill: var(--text); font-size: 13px; font-weight: 700; }
.chart-empty { padding: 30px; text-align: center; color: var(--muted); background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }

/* Estimate / methodology callouts */
.note { background: #fbf6e9; border: 1px solid #ecd9ad; border-radius: var(--radius); padding: 14px 16px; margin: 16px 0; font-size: .94rem; }
.note strong { color: var(--warn); }
.est-flag { font-size: .76rem; color: var(--warn); font-weight: 700; text-transform: uppercase; letter-spacing: .03em; }

/* Live map page */
.map-frame { width: 100%; height: 78vh; min-height: 480px; border: 1px solid var(--border); border-radius: var(--radius); }
.route-map { width: 100%; height: 340px; border: 1px solid var(--border); border-radius: var(--radius); margin: 8px 0 6px; z-index: 0; }
.route-map-lg { height: 460px; }
.route-map .leaflet-container { border-radius: var(--radius); }

/* Browse blocks */
.browse { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin: 14px 0; }
.browse a { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; font-weight: 600; }
.browse a:hover { background: #eef2fb; text-decoration: none; }
.browse a span { display: block; font-size: .8rem; color: var(--muted); font-weight: 400; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); margin-top: 40px; padding: 22px 0 40px; background: var(--surface); font-size: .9rem; }
.site-footer .muted { max-width: 75ch; }
.footer-nav { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 10px; }

.section-lead { color: var(--muted); max-width: 70ch; }
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.pill { background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 4px 12px; font-size: .85rem; }

@media (max-width: 640px) {
  .site-nav nav { margin-left: 0; width: 100%; }
  h1 { font-size: 1.55rem; }
}