/* Well Pump Reference Library — deep water blue + steel + teal.
   Same chart family as aitoolchart.net and bimchart.net; own accent and display face. */
:root {
  color-scheme: dark;
  --bg: #050d16;
  --bg-2: #081521;
  --surface: rgba(8, 22, 34, 0.80);
  --surface-2: rgba(11, 30, 45, 0.94);
  --fg: #e9f3f8;
  --muted: #93a9b8;
  --line: rgba(80, 190, 205, 0.26);
  --cyan: #3fc1c9;
  --cyan-2: #9be7ea;
  --cyan-dim: rgba(63, 193, 201, 0.14);
  --cyan-glow: rgba(63, 193, 201, 0.42);
  --ink: #04101a;
  --accent: var(--cyan);
  --steel: #8fb4c8;
  --warn: #f2c14e;
  --focus: #9be7ea;
  --btn: rgba(63, 193, 201, 0.12);
  --btn-h: rgba(63, 193, 201, 0.22);
  --radius: 16px;
  --bar-bg: rgba(63, 193, 201, 0.14);
  --nav-h: 64px; /* fallback; JS sets this to the real .topnav height */
  --display: "Archivo", "IBM Plex Sans", "Segoe UI", sans-serif;
  --body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.5;
  min-height: 100%;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
[hidden] { display: none !important; }
a { color: var(--cyan); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--cyan-2); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }
.skip {
  position: absolute; left: 12px; top: 8px; z-index: 40;
  background: var(--cyan); color: var(--ink); font-weight: 600;
  padding: 8px 12px; border-radius: 8px; text-decoration: none;
  transform: translateY(-120%);
}
.skip:focus { transform: none; color: var(--ink); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Backdrop: water glow + faint wave lines */
.page-bg {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(1100px 560px at 75% -10%, rgba(20, 110, 150, 0.30), transparent 60%),
    radial-gradient(800px 500px at 5% 105%, rgba(10, 70, 100, 0.28), transparent 55%),
    var(--bg);
}
.page-bg::after {
  content: ""; position: absolute; inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(63, 193, 201, 0.035) 0 1px, transparent 1px 34px);
  mask-image: radial-gradient(ellipse at 50% 0%, #000 20%, transparent 80%);
}

.wrap {
  max-width: 1180px; margin: 0 auto;
  padding: 20px max(16px, env(safe-area-inset-left)) 56px max(16px, env(safe-area-inset-right));
}
.wrap.chart-wrap { max-width: 1320px; }

/* Top nav */
.topnav {
  position: sticky; top: 0; z-index: 30;
  backdrop-filter: blur(16px);
  background: rgba(5, 13, 22, 0.90);
  border-bottom: 1px solid var(--line);
}
.topnav .inner {
  max-width: 1320px; margin: 0 auto;
  display: flex; align-items: center; gap: 10px 14px; flex-wrap: wrap;
  padding: 8px max(16px, env(safe-area-inset-left));
}
.brand {
  display: flex; align-items: center; gap: 9px;
  color: var(--fg); text-decoration: none; font-family: var(--display);
  font-weight: 700; font-size: 17px; letter-spacing: 0.02em; line-height: 1.1;
}
.brand svg { display: block; flex: none; }
.brand:hover { color: var(--cyan-2); }
.nav-links { display: flex; flex-wrap: wrap; gap: 2px; margin: 0 0 0 auto; list-style: none; padding: 0; }
.nav-links a {
  display: inline-block; color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 500;
  padding: 6px 9px; border-radius: 999px;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--fg); background: var(--cyan-dim); }
.nav-links a[aria-current="page"] { color: var(--cyan); }
.cmp-n {
  display: inline-block; min-width: 18px; padding: 0 5px; margin-left: 4px; border-radius: 9px;
  background: var(--cyan); color: var(--ink); font-size: 11px; font-weight: 700; text-align: center; line-height: 18px;
}
.nav-toggle {
  display: none; margin-left: auto; font: 600 14px var(--body); color: var(--fg);
  background: var(--btn); border: 1px solid var(--line); border-radius: 10px; padding: 7px 12px; cursor: pointer;
}
@media (max-width: 1099px) {
  .nav-toggle { display: inline-flex; align-items: center; gap: 8px; }
  .nav-links { display: none; width: 100%; margin: 0; flex-direction: column; gap: 0; padding-bottom: 6px; }
  .topnav.is-open .nav-links { display: flex; }
  .nav-links a { display: block; padding: 10px 8px; border-radius: 8px; font-size: 15px; }
}

/* Hero */
.hero {
  position: relative; overflow: hidden;
  border: 1px solid var(--line); border-radius: 22px;
  background: linear-gradient(180deg, rgba(8, 26, 40, 0.6), rgba(5, 11, 18, 0.9));
  margin: 16px 0 12px; min-height: 250px;
}
.hero.compact { min-height: 0; }
.hero-art { position: absolute; inset: 0; z-index: 0; pointer-events: none; color: var(--cyan); }
.hero-art svg { width: 100%; height: 100%; display: block; }
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background: linear-gradient(90deg, rgba(5, 13, 22, 0.92) 0%, rgba(5, 13, 22, 0.78) 42%, rgba(5, 13, 22, 0) 78%);
}
.hero-copy { position: relative; z-index: 1; padding: 36px 28px 30px; max-width: 44rem; }
.hero.compact .hero-copy { padding: 22px 24px 18px; }
.eyebrow {
  display: block; font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--cyan); font-weight: 500; margin-bottom: 6px;
}
h1 {
  font-family: var(--display); font-weight: 800;
  font-size: clamp(30px, 5.2vw, 54px); line-height: 1; letter-spacing: 0;
  margin: 0 0 10px; text-wrap: balance;
}
.hero.compact h1 { font-size: clamp(26px, 4vw, 38px); }
.lede { color: var(--muted); font-size: 17px; line-height: 1.45; margin: 0 0 6px; max-width: 60ch; }
.checked { margin: 8px 0 0; color: var(--muted); font-size: 13.5px; }

/* Safety note */
.safety {
  margin: 14px 0; padding: 12px 16px;
  border: 1px solid rgba(242, 193, 78, 0.35); border-left: 4px solid var(--warn);
  border-radius: 10px; background: rgba(242, 193, 78, 0.07);
  font-size: 14.5px; color: var(--fg);
}
.safety strong { color: var(--warn); }

/* Home cards */
.grp { margin-top: 36px; }
h2 { font-family: var(--display); font-weight: 700; letter-spacing: 0; }
.grp h2 { font-size: clamp(22px, 3vw, 30px); margin: 0 0 14px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.card {
  display: flex; flex-direction: column; gap: 6px; padding: 18px 20px 16px;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); color: inherit; text-decoration: none;
  transition: border-color .2s, box-shadow .2s, transform .2s;
}
a.card:hover, a.card:focus-visible {
  border-color: var(--cyan); box-shadow: 0 0 0 1px var(--cyan), 0 0 24px var(--cyan-glow);
  transform: translateY(-2px); color: inherit;
}
.cnt { font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--cyan); font-weight: 500; }
.nm { font-family: var(--display); font-weight: 700; font-size: 23px; line-height: 1.1; }
.ds { color: var(--muted); font-size: 14.5px; flex: 1; }
.go { font-weight: 600; font-size: 14px; color: var(--cyan); margin-top: 4px; }

/* Toolbar: filter groups, search, sort */
.toolbar { display: flex; flex-direction: column; gap: 10px; margin: 16px 0 8px; }
.fgroups { display: flex; flex-direction: column; gap: 8px; }
.fgroup { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; }
.flabel { font: 500 11.5px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); min-width: 72px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font: 500 13px var(--body); padding: 5px 11px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--btn); color: var(--fg); cursor: pointer;
}
.chip:hover { background: var(--btn-h); }
.chip[aria-pressed="true"] { background: var(--cyan); color: var(--ink); border-color: var(--cyan); font-weight: 600; }
.chip small { opacity: .7; font-size: 11px; margin-left: 3px; }
.tools { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: flex-end; }
.search, .sort {
  display: flex; flex-direction: column; gap: 4px;
  font: 500 11.5px var(--mono); color: var(--muted); letter-spacing: 0.08em; text-transform: uppercase;
}
.search input, .sort select {
  font: 500 15px var(--body); letter-spacing: 0; text-transform: none; color: var(--fg);
  background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px; padding: 7px 12px; min-width: 240px;
}
.sort select { min-width: 200px; }
.count { color: var(--muted); font-size: 13.5px; margin: 0 0 8px; }
.table-caption { color: var(--muted); font-size: 13px; line-height: 1.5; margin: 0 0 10px; }
.table-caption strong { color: var(--fg); font-weight: 600; }

/* Chart table: dense, sticky header inside the scrolling box */
.table-box {
  overflow: auto;
  max-height: min(78vh, calc(100vh - var(--nav-h) - 120px));
  min-height: 120px;
  border: 1px solid var(--line); border-radius: 12px; background: var(--surface);
}
table.chart { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; font-size: 13.5px; line-height: 1.35; }
.chart th, .chart td { padding: 7px 10px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.chart tbody tr:last-child td { border-bottom: 0; }
.chart tbody tr:hover td { background: rgba(63, 193, 201, 0.05); }
.chart th {
  font-size: 11px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--muted); font-weight: 700;
  background: #0a1b29; position: sticky; top: 0; white-space: nowrap; z-index: 3;
  border-bottom: 1px solid rgba(80, 190, 205, 0.45);
}
.chart th .th-note { display: block; font-size: 9.5px; font-weight: 500; letter-spacing: 0.03em; text-transform: none; margin-top: 2px; }
.th-btn { all: unset; cursor: pointer; display: inline-flex; gap: 4px; align-items: center; color: inherit; font: inherit; letter-spacing: inherit; text-transform: inherit; }
.th-btn:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.th-btn::after { content: "↕"; opacity: .4; font-size: 11px; }
.th-btn[data-dir="asc"]::after { content: "↑"; opacity: 1; color: var(--cyan); }
.th-btn[data-dir="desc"]::after { content: "↓"; opacity: 1; color: var(--cyan); }
.chart td.num { text-align: right; white-space: nowrap; }
.chart th.num { text-align: right; }
.chart td.nw { white-space: nowrap; }
.chart td.empty { color: var(--muted); font-size: 14px; padding: 18px 14px; }
.na { color: #5f7787; cursor: help; }
.cart { font-family: var(--display); font-weight: 700; font-size: 15px; line-height: 1.15; display: block; }
.ser { display: block; font-size: 12px; color: var(--muted); margin-top: 1px; }
.chart .sub { display: block; font-size: 11.5px; color: var(--muted); font-weight: 400; margin-top: 2px; max-width: 30ch; white-space: normal; }
.chart td.modelc { min-width: 150px; max-width: 280px; }
.chart td.typec { min-width: 130px; max-width: 200px; }
.chart td.setc { min-width: 140px; max-width: 220px; }
.chart td.warc { min-width: 120px; max-width: 200px; }
.price-v { font-family: var(--mono); font-weight: 600; font-size: 14px; color: var(--fg); }
.band { font-family: var(--mono); font-weight: 700; font-size: 15px; color: var(--warn); letter-spacing: 1px; }
.est { color: var(--muted); }
.src { font-size: 11.5px; color: var(--cyan); }
.links { display: flex; flex-direction: column; gap: 3px; min-width: 150px; }
.links a { font-size: 12.5px; white-space: nowrap; }
.links .off { color: var(--muted); font-size: 10.5px; margin-left: 4px; }

/* Brand badge / logo */
.brandc { min-width: 104px; }
.brand-badge {
  display: inline-flex; align-items: center; justify-content: center; min-width: 74px; max-width: 98px;
  padding: 5px 7px; border-radius: 8px; text-align: center;
  font: 700 10.5px/1.15 var(--mono); letter-spacing: 0.04em; text-transform: uppercase; overflow-wrap: anywhere;
  background: hsl(var(--h) 50% 17%); color: hsl(var(--h) 80% 86%); border: 1px solid hsl(var(--h) 45% 36%);
}
.brand-icon { display: block; height: 30px; max-width: 92px; object-fit: contain; background: #fff; border-radius: 6px; padding: 3px 5px; }
.brand-name { display: block; font-size: 11px; color: var(--muted); margin-top: 3px; }
.cmp { display: flex; align-items: center; gap: 5px; margin-top: 6px; font-size: 11.5px; color: var(--muted); cursor: pointer; white-space: nowrap; }
.cmp input { accent-color: var(--cyan); width: 15px; height: 15px; margin: 0; cursor: pointer; }
.cmp input:disabled { cursor: not-allowed; opacity: .45; }

/* Compare bar */
.cmp-bar {
  position: fixed; right: max(12px, env(safe-area-inset-right)); bottom: calc(62px + env(safe-area-inset-bottom, 0px)); z-index: 25;
  display: flex; align-items: center; gap: 8px; padding: 7px 8px 7px 12px; flex-wrap: wrap; max-width: calc(100vw - 24px);
  background: var(--surface-2); border: 1px solid var(--cyan); border-radius: 999px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.55), 0 0 18px var(--cyan-glow);
}
.cmp-go { font-weight: 700; font-size: 14px; color: var(--cyan-2); text-decoration: none; }
.cmp-bar button { font: 600 12.5px var(--body); color: var(--fg); background: var(--btn); border: 1px solid var(--line); border-radius: 999px; padding: 5px 11px; cursor: pointer; }
.cmp-bar button:hover { border-color: var(--cyan); }
.cmp-msg { font-size: 12px; color: var(--warn); }

/* Compare page */
.cmp-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
table.cmp-table { border-collapse: collapse; font-size: 13.5px; min-width: 100%; }
.cmp-table th, .cmp-table td { padding: 8px 12px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); min-width: 190px; max-width: 260px; }
.cmp-table th.rowh { position: sticky; left: 0; z-index: 2; min-width: 120px; max-width: 140px; background: #0a1b29; color: var(--muted); font: 700 11px var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.cmp-table thead th { background: #0a1b29; vertical-align: bottom; }
.cmp-table .rm { margin-top: 8px; font: 600 12px var(--body); color: var(--fg); background: var(--btn); border: 1px solid var(--line); border-radius: 999px; padding: 4px 10px; cursor: pointer; }
.cmp-table .rm:hover { border-color: var(--warn); color: var(--warn); }
.cmp-table td a { overflow-wrap: anywhere; }
.cmp-empty { padding: 26px 18px; color: var(--muted); }
.cmp-actions { display: flex; gap: 10px; align-items: center; margin: 10px 0; flex-wrap: wrap; }
.btn { font: 600 14px var(--body); color: var(--fg); background: var(--btn); border: 1px solid var(--line); border-radius: 10px; padding: 8px 14px; cursor: pointer; text-decoration: none; display: inline-block; }
.btn:hover { border-color: var(--cyan); color: var(--cyan-2); }

/* Notes panels */
.notes { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin-top: 28px; }
.notes section { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); padding: 16px 20px; }
.notes h2 { font-size: 20px; margin: 0 0 8px; }
.notes p, .notes li { color: var(--muted); font-size: 14.5px; margin: 0 0 8px; }
.notes p:last-child { margin-bottom: 0; }
.notes ul { margin: 0; padding-left: 18px; display: grid; gap: 6px; }

/* Article pages (sizing, updates) */
.prose { max-width: 820px; }
.prose h2 { font-size: 26px; margin: 34px 0 8px; scroll-margin-top: calc(var(--nav-h) + 12px); }
.prose h3 { font-family: var(--display); font-size: 18px; margin: 20px 0 6px; }
.prose p, .prose li { color: #c4d6e0; font-size: 16px; }
.prose ul, .prose ol { padding-left: 22px; display: grid; gap: 6px; }
.prose .toc { border: 1px solid var(--line); border-radius: 12px; background: var(--surface); padding: 12px 18px; }
.prose .toc ol { margin: 6px 0 0; }
.example { border-left: 3px solid var(--cyan); background: var(--cyan-dim); padding: 10px 16px; border-radius: 0 10px 10px 0; margin: 12px 0; }
.example p { margin: 4px 0; }
.mini { border-collapse: collapse; margin: 10px 0; font-size: 14.5px; font-variant-numeric: tabular-nums; }
.mini th, .mini td { border: 1px solid var(--line); padding: 6px 12px; text-align: left; }
.mini th { background: #0a1b29; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
.mini-box { overflow-x: auto; }
code, .formula { font-family: var(--mono); font-size: .92em; background: rgba(63, 193, 201, 0.1); padding: 1px 6px; border-radius: 5px; }
.log { border-left: 2px solid var(--line); padding-left: 16px; margin: 24px 0; }
.log h3 { margin: 0 0 6px; font-size: 20px; }
.log time { color: var(--cyan); font-family: var(--mono); font-size: 13px; }
.log ul { padding-left: 20px; display: grid; gap: 6px; }
.log li { color: #c4d6e0; }

/* Footer */
.site-footer { max-width: 1180px; margin: 8px auto 40px; padding: 0 16px 24px; color: var(--muted); font-size: 14px; }
.site-footer p { margin: 0 0 10px; }
.kofi { text-align: center; color: var(--muted); }
.kofi a { color: var(--cyan); text-decoration: none; }
.kofi a:hover { color: var(--cyan-2); text-decoration: underline; }

/* Scroll-hint chrome */
body .sh-hint { border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--fg); }
body .sh-btn { border: 1px solid var(--line); background: var(--btn); color: var(--fg); border-radius: 8px; }
body .sh-btn:hover:not(:disabled) { border-color: var(--cyan); color: var(--cyan); }
body .sh-arrow { color: var(--cyan); }
body .sh-edge.l { background: linear-gradient(to right, var(--bg-2), transparent); }
body .sh-edge.r { background: linear-gradient(to left, var(--bg-2), transparent); }
body .sh-rail { background: rgba(5, 12, 20, 0.94); }

/* Deep-linked row flash */
.chart tbody tr { scroll-margin-top: 40px; }
@keyframes row-flash { 0%, 55% { background: rgba(63, 193, 201, 0.24); } 100% { background: transparent; } }
.chart tbody tr.row-flash td { animation: row-flash 3s ease-out; }
.chart tbody tr.row-flash td:first-child { box-shadow: inset 4px 0 0 var(--cyan); }

/* Home search */
.site-search { margin: 20px 0 8px; padding: 16px 20px 14px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.site-search h2 { margin: 0 0 8px; font-size: 22px; }
.site-search label { display: block; font: 500 12px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.site-search input { width: 100%; font: 500 17px var(--body); color: var(--fg); background: var(--surface-2); border: 1px solid var(--line); border-radius: 12px; padding: 11px 14px; }
.site-search input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px var(--cyan-dim); outline: none; }
.sr-status { color: var(--muted); font-size: 14px; margin: 10px 0 0; }
.sr-list { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 8px; max-height: 520px; overflow-y: auto; }
.sr-item { display: flex; align-items: center; gap: 12px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 12px; background: rgba(6, 16, 26, 0.7); color: var(--fg); text-decoration: none; }
.sr-item:hover, .sr-item:focus-visible { border-color: var(--cyan); box-shadow: 0 0 0 1px var(--cyan); color: var(--fg); outline: none; }
.sr-lead { flex: none; width: 96px; display: flex; justify-content: center; }
.sr-main { display: flex; flex-direction: column; min-width: 0; flex: 1; }
.sr-name { font-weight: 600; font-size: 15.5px; }
.sr-maker { color: var(--muted); font-size: 13px; }
.sr-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 4px; }
.tag { font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 999px; background: var(--cyan-dim); color: var(--cyan-2); border: 1px solid rgba(63, 193, 201, 0.2); }
.sr-sec { flex: none; font: 500 11.5px var(--mono); letter-spacing: .05em; text-transform: uppercase; color: var(--cyan); border: 1px solid var(--line); border-radius: 999px; padding: 4px 10px; white-space: nowrap; }

@media (max-width: 640px) {
  .wrap { padding-top: 12px; }
  .hero-copy { padding: 22px 18px 20px; }
  .hero::after { background: linear-gradient(90deg, rgba(5, 13, 22, 0.93), rgba(5, 13, 22, 0.8)); }
  .lede { font-size: 15.5px; }
  .search input, .sort select { min-width: 0; width: 100%; }
  .search, .sort { flex: 1 1 100%; }
  .table-box { max-height: 74vh; }
  .sr-item { flex-wrap: wrap; }
  .sr-sec { margin-left: 108px; }
  .flabel { min-width: 100%; }
  .cmp-bar { right: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  a.card, a.card:hover { transition: none; transform: none; }
  .chart tbody tr.row-flash td { animation: none; background: rgba(63, 193, 201, 0.18); }
}