/* basin.css — site-local design system for sumppumpcostcalculator.com.
   Nothing here is shared with any sibling site. The visual idea is a waterline: a deep
   navy chrome above, a pale ground below, and a single rising accent for derived answers. */

:root {
  --ink: #10202c;
  --ink-soft: #3d5361;
  --paper: #f4f7f8;
  --card: #ffffff;
  --navy: #0d2438;
  --navy-2: #163a56;
  --water: #1d7fa8;
  --water-pale: #e2f0f6;
  --rust: #a2541f;
  --line: #cfdce2;
  --warn-bg: #fdf5e8;
  --warn-line: #d59b3c;
  --assume-bg: #f3f1fa;
  --assume-line: #6f5fa8;
  --radius: 10px;
  --measure: 74ch;
}

* { box-sizing: border-box; }
html { color-scheme: light; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.68 ui-serif, Georgia, 'Iowan Old Style', 'Times New Roman', serif;
}
a { color: #135f7f; text-underline-offset: .16em; }
a:hover { color: var(--rust); }
:focus-visible { outline: 3px solid var(--rust); outline-offset: 2px; border-radius: 3px; }

.sp-skip {
  position: absolute; left: -9999px; top: 0; background: var(--rust); color: #fff;
  padding: .6rem 1rem; z-index: 20;
}
.sp-skip:focus { left: 0; }

/* ---------------------------------------------------------------- chrome */
.sp-head { background: var(--navy); border-bottom: 3px solid var(--water); }
.sp-head__inner {
  width: min(1080px, calc(100% - 2rem)); margin: auto;
  display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: center;
  padding: .85rem 0;
}
.sp-brand { display: inline-flex; align-items: center; gap: .55rem; color: #fff; text-decoration: none; font-weight: 700; }
.sp-brand__mark {
  width: 20px; height: 20px; border-radius: 3px;
  background: linear-gradient(180deg, transparent 0 45%, var(--water) 45% 100%);
  border: 2px solid #7fc2dd;
}
.sp-brand__text { font-family: ui-sans-serif, system-ui, 'Segoe UI', sans-serif; letter-spacing: -.01em; font-size: 1.02rem; }
.sp-nav { display: flex; flex-wrap: wrap; gap: .15rem .9rem; margin-left: auto; }
.sp-nav__link {
  color: #cfe6f0; text-decoration: none; font: 500 .84rem/1.9 ui-sans-serif, system-ui, sans-serif;
  border-bottom: 2px solid transparent;
}
.sp-nav__link:hover { color: #fff; border-bottom-color: var(--water); }
.sp-nav__link.is-here { color: #fff; border-bottom-color: var(--rust); }

.sp-main { width: min(1080px, calc(100% - 2rem)); margin: auto; padding: 2rem 0 3.5rem; }
.sp-kicker {
  font: 700 .74rem/1.2 ui-sans-serif, system-ui, sans-serif;
  text-transform: uppercase; letter-spacing: .13em; color: var(--water);
  margin: 0 0 .5rem;
}
.sp-h1 {
  font: 700 clamp(1.85rem, 4.4vw, 2.9rem)/1.12 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: -.022em; margin: 0 0 1.4rem; max-width: 22ch;
}
.sp-h2 {
  font: 700 clamp(1.24rem, 2.4vw, 1.6rem)/1.22 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: -.015em; margin: 0 0 .85rem; color: var(--navy-2);
}
.sp-h3 { font: 700 1.02rem/1.3 ui-sans-serif, system-ui, sans-serif; margin: 0 0 .35rem; color: var(--navy-2); }
.sp-p { margin: 0 0 1rem; max-width: var(--measure); }
.sp-p--muted { color: var(--ink-soft); font-size: .93rem; }
.sp-sec {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(1.1rem, 2.6vw, 1.9rem); margin: 0 0 1.5rem;
}
.sp-list { margin: 0 0 1rem; padding-left: 1.15rem; max-width: var(--measure); }
.sp-list li { margin: .4rem 0; }
.sp-steps { margin: 0 0 1rem; padding-left: 1.3rem; max-width: var(--measure); }
.sp-steps li { margin: .5rem 0; }

/* ---------------------------------------------------------------- answers */
.sp-answer {
  margin: 1.4rem 0; padding: 1.1rem 1.25rem;
  background: var(--water-pale); border: 1px solid #b9dceb;
  border-left: 7px solid var(--water); border-radius: var(--radius);
}
.sp-answer__label {
  margin: 0 0 .3rem; font: 700 .74rem/1.2 ui-sans-serif, system-ui, sans-serif;
  text-transform: uppercase; letter-spacing: .11em; color: #12617f;
}
.sp-answer__value {
  margin: 0 0 .45rem; font: 700 clamp(1.3rem, 3vw, 1.85rem)/1.2 ui-sans-serif, system-ui, sans-serif;
  color: var(--navy); font-variant-numeric: tabular-nums;
}
.sp-answer__sub { margin: 0; font-size: .93rem; color: var(--ink-soft); max-width: var(--measure); }

.sp-statgrid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: .8rem; margin: 1.1rem 0;
}
.sp-stat {
  display: flex; flex-direction: column; gap: .18rem;
  padding: .8rem .9rem; background: #fbfdfe; border: 1px solid var(--line); border-radius: 8px;
}
.sp-stat__label { font: 600 .74rem/1.3 ui-sans-serif, system-ui, sans-serif; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-soft); }
.sp-stat__value { font: 700 1.15rem/1.25 ui-sans-serif, system-ui, sans-serif; color: var(--navy); font-variant-numeric: tabular-nums; }
.sp-stat__note { font-size: .8rem; color: var(--ink-soft); }

.sp-band {
  margin: .8rem 0; padding: .55rem .8rem; background: #f7fafb;
  border-left: 4px solid var(--water); font-size: .93rem; border-radius: 0 6px 6px 0;
}
.sp-band__label { font-weight: 700; color: var(--navy-2); }
.sp-swing {
  margin: .9rem 0; font-size: .93rem; color: var(--ink-soft);
  padding-left: .8rem; border-left: 3px solid var(--rust); max-width: var(--measure);
}
.sp-swing__label {
  display: block; font: 700 .72rem/1.3 ui-sans-serif, system-ui, sans-serif;
  text-transform: uppercase; letter-spacing: .1em; color: var(--rust);
}
.sp-excl { margin: 1.1rem 0 0; padding: .85rem 1rem; background: #fafbfc; border: 1px dashed var(--line); border-radius: 8px; }
.sp-excl__h { margin: 0 0 .4rem; font: 700 .8rem/1.3 ui-sans-serif, system-ui, sans-serif; color: var(--ink-soft); }
.sp-list--excl { font-size: .9rem; color: var(--ink-soft); margin-bottom: 0; }
.sp-list--warn li { margin: .5rem 0; }
.sp-warns { margin: .9rem 0 0; }

.sp-callout { margin: 1.1rem 0; padding: .95rem 1.1rem; border-radius: 8px; border-left: 6px solid; }
.sp-callout__h { margin: 0 0 .4rem; font: 700 .95rem/1.3 ui-sans-serif, system-ui, sans-serif; }
.sp-callout--note { background: #f1f7fa; border-color: var(--water); }
.sp-callout--warn { background: var(--warn-bg); border-color: var(--warn-line); }
.sp-callout--assumed { background: var(--assume-bg); border-color: var(--assume-line); }
.sp-callout .sp-p:last-child { margin-bottom: 0; }

.sp-quote { margin: .9rem 0; padding: .8rem 1rem; background: #f8fafb; border-left: 4px solid var(--navy-2); border-radius: 0 6px 6px 0; }
.sp-quote p { margin: 0 0 .4rem; font-style: italic; }
.sp-quote footer { font-size: .82rem; color: var(--ink-soft); font-style: normal; }
.sp-srcblock { padding: .9rem 0; border-bottom: 1px solid var(--line); }
.sp-srcblock:last-child { border-bottom: 0; }
.sp-arith {
  margin: .3rem 0; padding: .6rem .8rem; background: #f4f6f7; border-radius: 6px;
  font: .88rem/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; overflow-x: auto;
}
.sp-formula {
  margin: .8rem 0; padding: .9rem 1rem; background: var(--navy); color: #dff1f8;
  border-radius: 8px; font: 1.05rem/1.6 ui-monospace, SFMono-Regular, Menlo, monospace;
  text-align: center; overflow-x: auto;
}
.sp-tag {
  display: inline-block; font: 700 .68rem/1.4 ui-sans-serif, system-ui, sans-serif;
  background: var(--warn-bg); color: #8a5c10; border: 1px solid var(--warn-line);
  padding: .05rem .38rem; border-radius: 4px; vertical-align: middle;
}

/* ---------------------------------------------------------------- tables */
.sp-tablewrap { overflow-x: auto; margin: 1rem 0; -webkit-overflow-scrolling: touch; }
.sp-table { border-collapse: collapse; width: 100%; min-width: 520px; font-size: .92rem; }
.sp-table th, .sp-table td { text-align: left; padding: .55rem .7rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.sp-table thead th { background: var(--navy); color: #fff; font: 600 .82rem/1.3 ui-sans-serif, system-ui, sans-serif; border-bottom: 0; }
.sp-table tbody th { font-weight: 600; color: var(--navy-2); }
.sp-table tbody tr:nth-child(even) { background: #fafcfd; }

/* ---------------------------------------------------------------- forms */
.sp-tool { margin: 1.2rem 0; display: grid; gap: 1rem; }
.sp-fs { border: 1px solid var(--line); border-radius: 8px; padding: .9rem 1rem 1rem; margin: 0; background: #fcfdfe; }
.sp-fs__legend { font: 700 .82rem/1.3 ui-sans-serif, system-ui, sans-serif; text-transform: uppercase; letter-spacing: .08em; color: var(--water); padding: 0 .4rem; }
.sp-field { margin: .7rem 0; }
.sp-field__label { display: block; font: 600 .92rem/1.4 ui-sans-serif, system-ui, sans-serif; margin-bottom: .25rem; }
.sp-field__inputwrap { display: flex; align-items: center; gap: .45rem; }
.sp-field__input, .sp-field__select {
  font: inherit; font-size: .98rem; padding: .5rem .6rem; border: 1.5px solid #9fb6c1;
  border-radius: 6px; background: #fff; color: var(--ink); max-width: 15rem; width: 100%; min-height: 44px;
}
.sp-field__select { max-width: 26rem; }
.sp-field__suffix { font: 600 .85rem ui-sans-serif, system-ui, sans-serif; color: var(--ink-soft); }
.sp-field__hint { margin: .3rem 0 0; font-size: .85rem; color: var(--ink-soft); max-width: 62ch; }
.sp-field__input[aria-invalid="true"], .sp-field__select[aria-invalid="true"] {
  border-color: var(--rust); box-shadow: 0 0 0 2px rgba(162, 84, 31, .18);
}
.sp-input-error {
  margin: .85rem 0 0; padding: .75rem .85rem; border-left: 5px solid var(--rust);
  background: var(--warn-bg); color: #6d3715; font: 650 .9rem/1.45 ui-sans-serif, system-ui, sans-serif;
}
.sp-field--toggle .sp-field__toggle { display: flex; gap: .55rem; align-items: flex-start; min-height: 44px; font: 500 .95rem/1.45 ui-sans-serif, system-ui, sans-serif; cursor: pointer; }
.sp-field__toggle input { margin-top: .28rem; width: 1.05rem; height: 1.05rem; accent-color: var(--water); }

@media (min-width: 720px) {
  .sp-fs { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 0 1.4rem; }
  .sp-fs__legend { grid-column: 1 / -1; }
}

/* ---------------------------------------------------------------- footer */
.sp-foot { background: var(--navy); color: #c3d9e4; margin-top: 2rem; }
.sp-foot__inner { width: min(1080px, calc(100% - 2rem)); margin: auto; padding: 1.6rem 0 2.2rem; }
.sp-foot__line { margin: 0 0 .8rem; font-size: .88rem; max-width: 80ch; }
.sp-foot__nav { display: flex; flex-wrap: wrap; gap: .3rem 1.1rem; margin-bottom: .7rem; }
.sp-foot__nav a { color: #a8d3e6; font: 500 .87rem ui-sans-serif, system-ui, sans-serif; }
.sp-foot__rev { margin: 0; font-size: .8rem; color: #7fa2b4; }

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }