:root{--bg:#f6f8fa;--card:#fff;--ink:#16202b;--muted:#5a6877;--line:#dde3ea;--brand:#0b5cad;--brand-ink:#08407a;
--good:#1f8a4c;--high_ok:#b7791f;--caution:#d9622b;--low:#5b7083;--blown:#c0302f;--nodata:#777;--band:#cfe6f7;--radius:12px}
@media (prefers-color-scheme:dark){:root{--bg:#0e141b;--card:#161f29;--ink:#e8eef4;--muted:#98a7b6;--line:#26323f;--brand:#6db3f2;--brand-ink:#9ccbf7;--band:#1d3b55}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--brand)}a:hover{color:var(--brand-ink)}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
header.site{background:var(--card);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:12px;padding-bottom:12px;flex-wrap:wrap}
.logo{font-weight:800;font-size:1.25rem;letter-spacing:-.01em;text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:8px}
.logo svg{width:26px;height:26px}
nav.main a{margin-left:16px;text-decoration:none;font-weight:600;font-size:.95rem}
main{padding:20px 0 40px}
h1{font-size:clamp(1.55rem,4.5vw,2.25rem);line-height:1.2;margin:.2em 0 .3em;letter-spacing:-.02em}
h2{font-size:1.3rem;margin:1.6em 0 .5em}
h3{font-size:1.05rem;margin:1.2em 0 .3em}
.lede{color:var(--muted);font-size:1.08rem;max-width:62ch;margin:0 0 1rem}
.muted{color:var(--muted)}
.small{font-size:.85rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:16px 0}
.badge{display:inline-block;color:#fff;font-weight:700;font-size:.8rem;line-height:1;padding:5px 9px;border-radius:999px;white-space:nowrap}
.s-good{background:var(--good)}.s-high_ok{background:var(--high_ok)}.s-caution{background:var(--caution)}.s-low{background:var(--low)}.s-blown{background:var(--blown)}.s-nodata{background:var(--nodata)}
.badge.big{font-size:1rem;padding:8px 14px}
.summary{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.summary .pill{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:5px 12px;font-size:.9rem}
.summary .pill b{font-size:1.05rem}
.filters{display:flex;flex-wrap:wrap;gap:6px;margin:14px 0 8px}
.filters button{font:inherit;font-size:.88rem;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:6px 12px;cursor:pointer}
.filters button[aria-pressed=true]{background:var(--brand);border-color:var(--brand);color:#fff}
.tablewrap{overflow-x:auto;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
table.rivers{width:100%;border-collapse:collapse;min-width:560px}
table.rivers th,table.rivers td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
table.rivers th{font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);white-space:nowrap;background:var(--card);position:sticky;top:0}
table.rivers th button{all:unset;cursor:pointer;font:inherit;text-transform:inherit;letter-spacing:inherit}
table.rivers th button:hover,table.rivers th button:focus-visible{color:var(--brand);text-decoration:underline}
table.rivers th[aria-sort=ascending] button::after{content:" ▲"}table.rivers th[aria-sort=descending] button::after{content:" ▼"}
table.rivers tr:last-child td{border-bottom:0}
table.rivers td.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
table.rivers th.num{text-align:right}
.rname a{font-weight:650;text-decoration:none}
.rname .sub{display:block;color:var(--muted);font-size:.82rem}
.spark{color:var(--brand);display:block}
@media (max-width:700px){.hide-sm{display:none}table.rivers{min-width:0}table.rivers th,table.rivers td{padding:9px 8px}}
.hero{padding:6px 0 4px}
.signup{background:linear-gradient(135deg,var(--card),var(--card));border:1px dashed var(--brand)}
.signup form{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.signup input[type=email]{flex:1 1 220px;font:inherit;padding:10px 12px;border-radius:8px;border:1px solid var(--line);background:var(--bg);color:var(--ink)}
.signup button{font:inherit;font-weight:700;padding:10px 16px;border-radius:8px;border:0;background:var(--brand);color:#fff;cursor:pointer}
.signup .note{font-size:.8rem;color:var(--muted);margin:6px 0 0}
.placeholder{border:2px dashed var(--line);border-radius:var(--radius);padding:18px;text-align:center;color:var(--muted);font-size:.9rem;margin:16px 0;background:transparent}
.placeholder b{display:block;text-transform:uppercase;letter-spacing:.06em;font-size:.72rem}
.statusbar{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin:8px 0 4px}
.bigflow{font-size:2.2rem;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.bigflow small{font-size:1rem;font-weight:600;color:var(--muted)}
.kv{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:10px;margin:14px 0}
.kv div{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.kv dt{font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
.kv dd{margin:2px 0 0;font-weight:700;font-variant-numeric:tabular-nums}
svg.chart{width:100%;height:auto;display:block}
svg.chart .grid{stroke:var(--line);stroke-width:1}
svg.chart .axis{fill:var(--muted);font-size:11px}
svg.chart .axis-note{fill:var(--muted);font-size:10px}
svg.chart .band{fill:var(--band);opacity:.7}
svg.chart .line{stroke:var(--brand);stroke-width:2.2;stroke-linejoin:round}
svg.chart .median{stroke:var(--muted);stroke-width:1.5;stroke-dasharray:4 3}
svg.chart .dot{fill:var(--caution);stroke:var(--card);stroke-width:2}
svg.chart .today{stroke:var(--caution);stroke-width:1;stroke-dasharray:3 3}
table.plain{width:100%;border-collapse:collapse;font-size:.92rem}
table.plain th,table.plain td{padding:7px 8px;border-bottom:1px solid var(--line);text-align:left}
table.plain td.num,table.plain th.num{text-align:right;font-variant-numeric:tabular-nums}
.tags span{display:inline-block;background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:2px 10px;font-size:.82rem;margin:0 6px 6px 0}
.disclaimer{border-left:4px solid var(--caution);background:var(--card);padding:12px 14px;border-radius:0 10px 10px 0;font-size:.92rem;margin:20px 0}
.crumbs{font-size:.85rem;color:var(--muted)}.crumbs a{color:inherit}
.related{display:flex;flex-wrap:wrap;gap:8px}.related a{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:5px 12px;text-decoration:none;font-size:.9rem}
footer.site{border-top:1px solid var(--line);padding:22px 0 40px;color:var(--muted);font-size:.85rem}
footer.site a{color:inherit}
.prose{max-width:70ch}.prose li{margin:.3em 0}
.nl-body{background:#fff;color:#1b2430;border-radius:var(--radius);padding:18px;border:1px solid var(--line)}
.nl-body a{color:#0b5cad}
.visually-hidden{position:absolute;left:-9999px}