:root {
  --ink: #10201f;
  --ink-2: #1b2b2a;
  --ink-mute: #5b6b69;
  --mist: #f1f5f2;
  --mist-2: #e4ebe7;
  --line: #c9d4cf;
  --cay: #0f9494;
  --silt: #c47a2a;
  --orchid: #6a5fd1;
  --flood: #b3372b;
  --surface: var(--mist);
  --surface-2: #ffffff;
  --text: var(--ink-2);
  --text-mute: var(--ink-mute);
  --series-1: var(--cay);
  --series-2: var(--silt);
  --series-3: var(--orchid);
  --stage-0: #cfe3df;
  --stage-1: #9fcbc6;
  --stage-2: #5fb0ab;
  --stage-3: #2a8f8c;
  --stage-4: #b3372b;
  --cat-4: #1b6866;
  --cat-5: #0d3f3e;
  --radius: 6px;
  --measure: 64ch;
  --font-display: "Fraunces", Georgia, serif;
  --font-text: "IBM Plex Sans", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --surface: #10201f;
    --surface-2: #172b2a;
    --mist-2: #1f3433;
    --line: #2f4846;
    --text: #e4ece9;
    --text-mute: #9db0ac;
    --series-1: #23a3a0;
    --series-2: #cc7a33;
    --series-3: #8a7ce6;
    --flood: #d9574a;
    --stage-0: #3a5a57;
    --stage-1: #234a48;
    --stage-2: #1f6b68;
    --stage-3: #23a3a0;
    --stage-4: #d9574a;
    --cat-4: #6fcfcb;
    --cat-5: #b4eae6;
  }
}
:root[data-theme="dark"] {
  --surface: #10201f;
  --surface-2: #172b2a;
  --mist-2: #1f3433;
  --line: #2f4846;
  --text: #e4ece9;
  --text-mute: #9db0ac;
  --series-1: #23a3a0;
  --series-2: #cc7a33;
  --series-3: #8a7ce6;
  --flood: #d9574a;
  --stage-0: #3a5a57;
  --stage-1: #234a48;
  --stage-2: #1f6b68;
  --stage-3: #23a3a0;
  --stage-4: #d9574a;
  --cat-4: #6fcfcb;
  --cat-5: #b4eae6;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-text);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration-color: var(--series-1); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--series-1); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.1;
  margin: 0;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2.6rem, 7vw, 5.2rem); font-variation-settings: "SOFT" 60, "opsz" 120; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-variation-settings: "SOFT" 40, "opsz" 72; }
h3 { font-size: 1.2rem; font-variation-settings: "SOFT" 30, "opsz" 36; }
p { margin: 0 0 1em; max-width: var(--measure); }
p.lede { font-size: 1.2rem; line-height: 1.45; max-width: 44ch; }
.mute { color: var(--text-mute); }
.small { font-size: 0.9rem; }

.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }

/* Header */
.site-head {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap { display: flex; align-items: center; gap: 24px; min-height: 56px; }
.brand { font-family: var(--font-display); font-size: 1.25rem; text-decoration: none; display: flex; align-items: center; gap: 10px; }
.brand svg { width: 22px; height: 22px; }
.site-nav { margin-left: auto; display: flex; gap: 4px 18px; flex-wrap: wrap; font-size: 0.95rem; }
.site-nav a { text-decoration: none; color: var(--text-mute); padding: 6px 0; }
.site-nav a:hover, .site-nav a[aria-current="true"] { color: var(--text); }
@media (max-width: 640px) { .site-nav { display: none; } }

/* Hero */
.hero { padding: clamp(40px, 7vw, 88px) 0 32px; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 48px; align-items: start; }
@media (max-width: 860px) { .hero .wrap { grid-template-columns: 1fr; } }
.hero-copy .meaning { font-family: var(--font-display); font-style: italic; color: var(--text-mute); margin-top: 10px; font-size: 1.15rem; }
.hero-copy .lede { margin-top: 22px; }
.quick-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; max-width: 520px; }
.quick-facts div { border-top: 2px solid var(--line); padding-top: 10px; }
.quick-facts b { display: block; font-family: var(--font-display); font-size: 1.6rem; font-weight: 500; line-height: 1.1; }
.quick-facts span { font-size: 0.85rem; color: var(--text-mute); }

.gauge-card { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px 12px; }
.gauge-card header { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 6px; }
.gauge-card header h3 { font-size: 1.05rem; }
.gauge-card header time { font-size: 0.85rem; color: var(--text-mute); }
.gauge { width: 100%; height: auto; display: block; }
.gauge text { font-family: var(--font-text); font-size: 12px; fill: var(--text); }
.gauge .stage-label { fill: var(--text-mute); font-size: 11px; }
.gauge .tick { stroke: var(--line); }
.gauge .band { opacity: 0.9; }
.gauge .station { cursor: default; }
.gauge .station circle { stroke: var(--surface-2); stroke-width: 2; }
.gauge .station text { font-size: 11.5px; }
.gauge-remarks { font-size: 0.9rem; color: var(--text-mute); margin: 10px 0 0; max-width: none; }

/* Sections */
section.block { padding: clamp(40px, 6vw, 72px) 0; border-top: 1px solid var(--line); }
.block-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 24px 48px; margin-bottom: 28px; align-items: end; }
@media (max-width: 860px) { .block-head { grid-template-columns: 1fr; } }
.block-head p { margin: 0; color: var(--text-mute); }

/* Chart frame */
.chart { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; position: relative; }
.chart svg { width: 100%; height: auto; display: block; overflow: visible; }
.chart text { font-family: var(--font-text); font-size: 12px; fill: var(--text-mute); }
.chart .axis line, .chart .grid line { stroke: var(--line); }
.chart .grid line { stroke-dasharray: 2 4; }
.chart .series path { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.chart .series circle { stroke: var(--surface-2); stroke-width: 2; }
.chart .label { fill: var(--text); font-size: 12px; }
.chart .crosshair { stroke: var(--text-mute); stroke-width: 1; pointer-events: none; }
.legend { display: flex; gap: 8px 20px; flex-wrap: wrap; margin: 0 0 10px; padding: 0; list-style: none; font-size: 0.9rem; }
.legend li { display: flex; align-items: center; gap: 8px; }
.legend i { width: 14px; height: 3px; border-radius: 2px; display: inline-block; }
.legend .dot i { width: 10px; height: 10px; border-radius: 50%; }
.tooltip {
  position: absolute; pointer-events: none; z-index: 5;
  background: var(--text); color: var(--surface);
  padding: 8px 10px; border-radius: 4px; font-size: 0.85rem; line-height: 1.35;
  max-width: 260px; opacity: 0; transition: opacity 120ms;
}
.tooltip.on { opacity: 1; }
.tooltip b { font-weight: 600; }
.chart-foot { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 10px; font-size: 0.85rem; color: var(--text-mute); }
.chart-foot button { background: none; border: 1px solid var(--line); color: var(--text); border-radius: 4px; padding: 4px 10px; font: inherit; font-size: 0.85rem; cursor: pointer; }
.chart-foot button:hover { border-color: var(--text-mute); }
.chart-foot button[aria-expanded="true"] { background: var(--mist-2); }

table.data { width: 100%; border-collapse: collapse; font-size: 0.92rem; margin-top: 12px; }
table.data th, table.data td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data th { font-weight: 600; color: var(--text-mute); font-size: 0.85rem; }
table.data td.num, table.data th.num { text-align: right; font-variant-numeric: tabular-nums; }
.table-wrap { overflow-x: auto; }
[hidden] { display: none !important; }

/* Rivers */
.regions { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.region { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.region h3 { margin-bottom: 10px; }
.station-list { list-style: none; padding: 0; margin: 0; }
.station-list li { display: grid; grid-template-columns: 12px 1fr auto; gap: 10px; align-items: baseline; padding: 7px 0; border-top: 1px solid var(--line); font-size: 0.95rem; }
.station-list li:first-child { border-top: 0; }
.station-list .pip { width: 10px; height: 10px; border-radius: 50%; display: inline-block; align-self: center; border: 1px solid color-mix(in srgb, var(--text) 25%, transparent); }
.station-list .place { color: var(--text-mute); font-size: 0.85rem; display: block; }
.station-list .stage { font-size: 0.82rem; color: var(--text-mute); white-space: nowrap; }
.stage-key { display: flex; gap: 8px 18px; flex-wrap: wrap; list-style: none; padding: 0; margin: 0 0 18px; font-size: 0.88rem; }
.stage-key li { display: flex; gap: 8px; align-items: center; }
.stage-key i { width: 12px; height: 12px; border-radius: 50%; display: inline-block; border: 1px solid color-mix(in srgb, var(--text) 25%, transparent); }

/* Hurricanes timeline */
.timeline-chart .storm circle { cursor: default; }
.timeline-chart .decade { fill: var(--text-mute); }
.cat-key { display: flex; gap: 8px 16px; flex-wrap: wrap; list-style: none; padding: 0; margin: 0 0 10px; font-size: 0.88rem; }
.cat-key li { display: flex; gap: 6px; align-items: center; }
.cat-key i { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }

/* Floods */
.flood-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; }
.flood-list li { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 16px 0; border-top: 1px solid var(--line); }
.flood-list li:first-child { border-top: 0; }
.flood-list time { font-family: var(--font-display); font-size: 1.3rem; font-weight: 500; line-height: 1.1; }
.flood-list time small { display: block; font-family: var(--font-text); font-size: 0.8rem; color: var(--text-mute); margin-top: 4px; }
.flood-list h3 { margin-bottom: 4px; }
.flood-list p { margin: 0 0 6px; max-width: 70ch; }
.tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tags span { font-size: 0.78rem; color: var(--text-mute); border: 1px solid var(--line); border-radius: 999px; padding: 1px 9px; }
@media (max-width: 560px) { .flood-list li { grid-template-columns: 1fr; gap: 6px; } }

/* Before you build */
.build-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px 32px; }
.build-grid h3 { margin-bottom: 8px; }
.build-grid p { font-size: 0.95rem; margin: 0; }

/* About / footer */
.about .wrap { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px 48px; }
@media (max-width: 860px) { .about .wrap { grid-template-columns: 1fr; } }
.source-list { list-style: none; padding: 0; margin: 0; font-size: 0.95rem; }
.source-list li { padding: 10px 0; border-top: 1px solid var(--line); }
.source-list li:first-child { border-top: 0; }
.source-list .conf { font-size: 0.8rem; color: var(--text-mute); display: block; }
footer.site-foot { border-top: 1px solid var(--line); padding: 28px 0 40px; font-size: 0.88rem; color: var(--text-mute); }
footer .wrap { display: flex; justify-content: space-between; gap: 12px 24px; flex-wrap: wrap; }
footer p { margin: 0; max-width: none; }