/* FilterByZip — municipal water survey instrument.
   Paper #FBFBF9 · ink #111 · one accent: cobalt #1436E8 (7.4:1 on paper, AA).
   Space Grotesk (variable) for headings/body · IBM Plex Mono for data, labels, digits. */

@font-face {
  font-family: "Space Grotesk";
  src: url("/static/fonts/SpaceGrotesk-var.woff2") format("woff2");
  font-weight: 300 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("/static/fonts/IBMPlexMono-400.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}

:root {
  --paper: #fbfbf9;
  --ink: #111111;
  --ink-2: #55554f;      /* muted — 7.2:1 on paper */
  --accent: #1436e8;     /* cobalt — 7.4:1 on paper */
  --hairline: #dcdcd6;
  --leader: #a9a9a2;
  --grotesk: "Space Grotesk", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --pad: clamp(1.25rem, 5vw, 2.5rem);
}

* { box-sizing: border-box; margin: 0; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

body {
  font-family: var(--grotesk);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--ink); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}

/* micro-label: the document's recurring voice */
.micro {
  font-family: var(--mono);
  font-size: .7rem;
  font-weight: 400;
  letter-spacing: .14em;
  text-transform: uppercase;
}

/* ---------- header + metadata strip ---------- */

.site-head {
  display: flex; justify-content: space-between; align-items: baseline;
  max-width: 46rem; margin: 0 auto;
  padding: 1.1rem var(--pad) .9rem;
}
.wordmark {
  font-family: var(--grotesk); font-weight: 600;
  font-size: 1rem; letter-spacing: .12em; text-transform: uppercase;
  text-decoration: none;
}
.site-head nav a {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .14em;
  text-transform: uppercase; text-decoration: none;
}
.site-head nav a:hover { color: var(--accent); text-decoration: underline; }

.meta-strip {
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--hairline);
}
.meta-strip-inner {
  max-width: 46rem; margin: 0 auto;
  padding: .5rem var(--pad);
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  font-family: var(--mono); font-size: .65rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-2);
}

/* ---------- layout + section heads ---------- */

main { max-width: 46rem; margin: 0 auto; padding: 0 var(--pad); }

.sec-head {
  display: flex; align-items: baseline; gap: 1rem;
  border-top: 1px solid var(--ink);
  padding-top: .55rem;
  font-family: var(--mono); font-size: .7rem; letter-spacing: .14em;
  text-transform: uppercase;
}
.sec-head .sec-no { color: var(--accent); }
.sec-head .sec-note { margin-left: auto; color: var(--ink-2); text-align: right; }

/* ---------- 01 lookup ---------- */

.hero { padding-top: clamp(2.5rem, 7vw, 4rem); position: relative; }

/* single contour-line texture zone — barely visible */
.hero::before {
  content: ""; position: absolute; top: 0; right: 0;
  width: min(24rem, 70%); height: 100%;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 400 300' fill='none' stroke='%23111111' stroke-width='1'%3E%3Cpath d='M60 150c0-55 62-95 130-95s136 33 136 88-56 102-124 102S60 205 60 150z'/%3E%3Cpath d='M92 150c0-42 48-74 100-74s104 26 104 68-42 78-94 78-110-30-110-72z'/%3E%3Cpath d='M124 150c0-29 34-53 70-53s72 18 72 47-28 54-64 54-78-19-78-48z'/%3E%3Cpath d='M156 149c0-16 19-29 40-29s41 10 41 26-15 30-36 30-45-11-45-27z'/%3E%3Cpath d='M182 148c0-7 8-13 17-13s18 4 18 11-6 13-15 13-20-4-20-11z'/%3E%3C/svg%3E") top right / contain no-repeat;
  opacity: .05; pointer-events: none;
}
.hero > * { position: relative; }

h1 {
  font-family: var(--grotesk); font-weight: 600; font-style: normal;
  font-size: clamp(1.85rem, 6.5vw, 2.9rem);
  line-height: 1.08; letter-spacing: -.015em;
  max-width: 22ch;
  margin-top: 1.5rem;
}

.lede {
  margin-top: 1.1rem; max-width: 46ch;
  font-size: 1rem; color: var(--ink-2);
}

/* the register: five comb cells, as on an official form */
.zip-form { margin-top: clamp(2rem, 6vw, 3rem); }

.field-label {
  display: block;
  font-family: var(--mono); font-size: .7rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-2);
  margin-bottom: .6rem;
}

.zip-register {
  --cell: 1.7ch;
  display: inline-block; overflow: hidden;
  font-family: var(--mono);
  font-size: clamp(2.7rem, 14vw, 4.25rem);
  line-height: 1.3;
  width: calc(5 * var(--cell) + 3px);
  border: 1.5px solid var(--ink);
  background-color: #ffffff;
  background-image:
    linear-gradient(var(--ink), var(--ink)),
    linear-gradient(var(--ink), var(--ink)),
    linear-gradient(var(--ink), var(--ink)),
    linear-gradient(var(--ink), var(--ink));
  background-repeat: no-repeat;
  background-size: 1px 100%;
  background-position:
    calc(var(--cell) - 1px) 0,
    calc(var(--cell) * 2 - 1px) 0,
    calc(var(--cell) * 3 - 1px) 0,
    calc(var(--cell) * 4 - 1px) 0;
}
.zip-register:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.zip-input {
  display: block;
  font: inherit; font-weight: 400;
  width: calc(5 * var(--cell) + 1ch);
  padding: 0 0 0 calc((var(--cell) - 1ch) / 2);
  letter-spacing: calc(var(--cell) - 1ch);
  color: var(--ink); caret-color: var(--accent);
  background: transparent; border: none; border-radius: 0; outline: none;
}

.btn-primary {
  display: inline-block; margin-top: 1.4rem;
  font-family: var(--mono); font-size: .8rem; letter-spacing: .14em;
  text-transform: uppercase;
  color: #ffffff; background: var(--accent);
  border: none; border-radius: 0;
  padding: 1rem 1.75rem; cursor: pointer;
}
.btn-primary:hover { background: #0f2ab8; }

.hint {
  margin-top: .9rem;
  font-family: var(--mono); font-size: .65rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-2);
}
.error {
  margin-top: .9rem;
  font-family: var(--mono); font-size: .8rem;
  color: var(--ink);
}
.done { margin-top: .9rem; font-family: var(--mono); font-size: .8rem; color: var(--ink); }

/* refine */
.refine { margin-top: 2.5rem; border-top: 1px solid var(--hairline); }
.refine summary {
  cursor: pointer; padding: .8rem 0;
  font-family: var(--mono); font-size: .7rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-2);
}
.refine summary:hover { color: var(--accent); }
.refine-fields { display: flex; flex-wrap: wrap; gap: 1.5rem 3rem; padding: .4rem 0 1.5rem; }
fieldset { border: none; padding: 0; }
legend, .field label {
  display: block; margin-bottom: .55rem;
  font-family: var(--mono); font-size: .65rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-2);
}
.seg { display: inline-flex; border: 1px solid var(--ink); }
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.seg span {
  display: block; padding: .5rem 1rem;
  font-family: var(--mono); font-size: .85rem;
  border-left: 1px solid var(--ink);
}
.seg label:first-child span { border-left: none; }
.seg input:checked + span { background: var(--ink); color: var(--paper); }
.seg input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: -2px; }
select {
  font-family: var(--mono); font-size: .85rem; color: var(--ink);
  background: #ffffff; border: 1px solid var(--ink); border-radius: 0;
  padding: .5rem .7rem; min-width: 11rem;
}

/* ---------- 02 result: spec sheet ---------- */

.result { padding-top: clamp(3rem, 8vw, 4.5rem); }
@media (prefers-reduced-motion: no-preference) {
  .result:not([hidden]) { animation: reveal .4s ease-out both; }
  @keyframes reveal {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: none; }
  }
}

.spec-place {
  font-family: var(--mono); font-size: .8rem; letter-spacing: .06em;
  text-transform: uppercase;
  margin-top: 1.4rem;
}

.interval {
  font-family: var(--grotesk); font-weight: 600;
  font-size: clamp(2rem, 7vw, 3rem);
  line-height: 1.05; letter-spacing: -.015em;
  margin-top: .5rem;
}
.interval em { font-style: normal; color: var(--accent); }

.spec-table { margin-top: 1.75rem; border-top: 1px solid var(--hairline); }
.spec-row {
  display: flex; align-items: baseline; gap: .6rem;
  padding: .7rem 0;
  border-bottom: 1px solid var(--hairline);
}
.spec-row dt {
  flex: none;
  font-family: var(--mono); font-size: .65rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-2);
}
.spec-row .leader {
  flex: 1 1 1rem; min-width: 1rem;
  border-bottom: 1px dotted var(--leader);
  transform: translateY(-.25em);
}
.spec-row dd {
  margin: 0; max-width: 60%;
  font-family: var(--mono); font-size: .85rem;
  text-align: right;
}
.spec-row dd strong {
  font-weight: 400; color: var(--accent);
  text-transform: uppercase; letter-spacing: .08em;
}

/* calibrated gauge: 0–20 grains per gallon */
.gauge { margin-top: 2rem; }
.gauge-zones { display: flex; }
.gauge-zones span {
  width: 17.5%;
  font-family: var(--mono); font-size: .55rem; letter-spacing: .06em;
  text-transform: uppercase; color: var(--ink-2);
  white-space: nowrap; overflow: hidden;
}
.gauge-zones span:last-child { width: 47.5%; }
.gauge-track {
  position: relative; height: 30px; margin-top: .3rem;
  border-bottom: 1px solid var(--ink);
  background:
    linear-gradient(var(--ink), var(--ink)) 0 100% / 1px 18px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 17.5% 100% / 1px 18px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 35% 100% / 1px 18px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 52.5% 100% / 1px 18px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 100% 100% / 1px 18px no-repeat,
    repeating-linear-gradient(to right, var(--hairline) 0 1px, transparent 1px 2.5%) 0 100% / 100% 9px no-repeat;
}
.gauge-marker {
  position: absolute; bottom: 0; left: 0;
  width: 3px; height: 26px; background: var(--accent);
}
.gauge-marker::before {
  content: ""; position: absolute; top: -6px; left: -3.5px;
  border: 5px solid transparent; border-top-color: var(--accent);
}
.gauge-scale { position: relative; height: 1.1rem; margin-top: .35rem; }
.gauge-scale span {
  position: absolute; transform: translateX(-50%);
  font-family: var(--mono); font-size: .6rem; letter-spacing: .04em;
  color: var(--ink-2);
}
.gauge-scale span:first-child { left: 0; transform: none; }
.gauge-scale span:last-child { left: auto; right: 0; transform: none; }
.gauge-unit {
  margin-top: .4rem;
  font-family: var(--mono); font-size: .6rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-2);
}

.why { margin-top: 1.75rem; font-size: .95rem; color: var(--ink-2); max-width: 58ch; }

.spec-note {
  margin-top: 1.5rem; padding-top: .7rem;
  border-top: 1px solid var(--hairline);
  font-family: var(--mono); font-size: .65rem; letter-spacing: .06em;
  color: var(--ink-2);
}

.buy-link {
  display: inline-block; margin-top: 1.6rem;
  font-family: var(--mono); font-size: .8rem; letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent); text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: .2rem;
}
.buy-link:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ---------- 03 reminder ---------- */

.remind { margin-top: clamp(3rem, 8vw, 4.5rem); }
.remind h2 {
  font-family: var(--grotesk); font-weight: 600; font-style: normal;
  font-size: clamp(1.35rem, 4.5vw, 1.75rem); letter-spacing: -.01em;
  margin-top: 1.4rem;
}
.remind > p { margin-top: .5rem; color: var(--ink-2); }
.remind-form { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.25rem; }
.remind-form input {
  flex: 1 1 14rem;
  font-family: var(--mono); font-size: .9rem; color: var(--ink);
  background: #ffffff; border: 1.5px solid var(--ink); border-radius: 0;
  padding: .9rem 1rem;
}
.remind-form input::placeholder { color: #8a8a84; }
.remind-form .btn-primary { margin-top: 0; }

/* ---------- 04 method ---------- */

.steps { margin-top: clamp(3.5rem, 9vw, 5.5rem); }
.steps h2 {
  font-family: var(--grotesk); font-weight: 600; font-style: normal;
  font-size: clamp(1.35rem, 4.5vw, 1.75rem); letter-spacing: -.01em;
  margin-top: 1.4rem; margin-bottom: 1.75rem;
}
.steps ol { list-style: none; padding: 0; }
.steps li {
  display: flex; gap: 1.25rem; align-items: baseline;
  padding: 1.1rem 0;
  border-top: 1px solid var(--hairline);
}
.step-n {
  flex: 0 0 auto;
  font-family: var(--mono); font-size: .7rem; letter-spacing: .1em;
  color: var(--accent);
}
.steps p { max-width: 54ch; color: var(--ink-2); }
.steps strong { color: var(--ink); font-weight: 600; }
.steps-more { margin-top: 1.5rem; }
.steps-more a {
  font-family: var(--mono); font-size: .8rem; letter-spacing: .06em;
  text-decoration: none; border-bottom: 1px solid var(--accent); padding-bottom: .2rem;
}

/* ---------- colophon ---------- */

.site-foot { border-top: 1px solid var(--ink); margin-top: clamp(4rem, 10vw, 6.5rem); }
.foot-inner { max-width: 46rem; margin: 0 auto; padding: 1.75rem var(--pad) 2.5rem; }
.foot-id {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  font-family: var(--mono); font-size: .65rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-2);
  padding-bottom: 1rem; margin-bottom: 1rem;
  border-bottom: 1px solid var(--hairline);
}
.foot-links { display: flex; gap: 1.75rem; flex-wrap: wrap; margin-bottom: 1.25rem; }
.foot-links a {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .12em;
  text-transform: uppercase; text-decoration: none;
}
.foot-links a:hover { color: var(--accent); text-decoration: underline; }
.foot-legal {
  margin-top: .45rem; max-width: 60ch;
  font-family: var(--mono); font-size: .68rem; line-height: 1.6;
  color: var(--ink-2);
}

/* ---------- inner pages ---------- */

.page { padding-top: clamp(2.5rem, 7vw, 4rem); }
.page h1 {
  font-family: var(--grotesk); font-weight: 600; font-style: normal;
  font-size: clamp(1.7rem, 5.5vw, 2.4rem); line-height: 1.1; letter-spacing: -.015em;
  max-width: 24ch;
}
.page h1 em { font-style: normal; }
.page h2 {
  margin: 2.75rem 0 .25rem;
  padding-top: .55rem;
  border-top: 1px solid var(--ink);
  font-family: var(--mono); font-weight: 400;
  font-size: .75rem; letter-spacing: .12em; text-transform: uppercase;
}
.page p, .page li { color: var(--ink-2); max-width: 62ch; margin-top: .75rem; }
.page ul { padding-left: 1.25rem; }
.page strong { color: var(--ink); font-weight: 600; }