/* ---------------------------------------------------------------
   hydrostations landing page
   Palette sampled directly from the hero photograph (deep rippled
   water) plus one deliberate accent: --gauge, the rust-red used on
   physical staff gauges and flood-stage markers -- an accent drawn
   from the subject's own field equipment, not a generic "pop" color.
   ----------------------------------------------------------------*/

:root {
  --ink: #141c21;
  --deep: #142530;
  --water: #1c3a4d;
  --ripple: #3576a3;
  --foam: #b7cdd4;
  --mist: #e8eef0;
  --paper: #d9d2bd;
  --paper-ink: #211f1a;
  --gauge: #c1502e;
  --gauge-bright: #dd6a44;
  --agency: #4f9bd6;
  --research: #a99ad1;
  --citizen: #e0895f;

  --font-display: "Fraunces", serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --measure: 72ch;
  --edge: clamp(20px, 5vw, 64px);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

::selection {
  background: var(--gauge);
  color: var(--mist);
}

:focus-visible {
  outline: 2px solid var(--gauge-bright);
  outline-offset: 3px;
}

img {
  max-width: 100%;
  display: block;
}

.wrap {
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: var(--edge);
}

/* ---------- nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px var(--edge);
  background: color-mix(in srgb, var(--ink) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in srgb, var(--ripple) 35%, transparent);
}

.nav-mark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 25px;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--mist);
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 14.5px;
  letter-spacing: 0.02em;
}

.nav-links a {
  text-decoration: none;
  color: var(--foam);
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--mist);
}

@media (max-width: 640px) {
  .nav-links {
    gap: 16px;
  }
  .nav-links li:nth-child(3) {
    display: none;
  }
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  background: var(--ink);
  overflow: hidden;
  min-height: clamp(540px, 58vw, 660px);
  display: flex;
  align-items: center;
}

.hero > .wrap {
  width: 100%;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 600px;
  padding-block: 76px;
}

@media (max-width: 900px) {
  .hero {
    display: flex;
    flex-direction: column;
    min-height: 0;
  }
  .hero-copy {
    max-width: none;
    padding-block: 32px 40px;
  }
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 14.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--foam);
  margin: 0 0 20px;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(56px, 7.5vw, 96px);
  line-height: 0.95;
  letter-spacing: -0.01em;
  margin: 0 0 26px;
  color: var(--mist);
}

@media (max-width: 900px) {
  .hero h1 {
    font-size: clamp(38px, 11vw, 64px);
  }
}

.hero-sub {
  font-size: clamp(18px, 1.6vw, 21px);
  line-height: 1.6;
  color: var(--foam);
  max-width: 46ch;
  margin: 0 0 36px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-bottom: 40px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.01em;
  text-decoration: none;
  border-radius: 3px;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--gauge);
  color: var(--mist);
}

.btn-primary:hover {
  background: var(--gauge-bright);
}

.btn-ghost {
  border-color: color-mix(in srgb, var(--foam) 45%, transparent);
  color: var(--mist);
}

.btn-ghost:hover {
  border-color: var(--mist);
}

.hero-photo-frame {
  position: absolute;
  inset: 0;
  left: 42%;
  margin: 0;
  border: none;
  padding: 0;
  background: var(--deep);
  border-left: 1px solid color-mix(in srgb, var(--ripple) 55%, transparent);
}

.hero-photo-frame picture {
  display: block;
  position: relative;
  overflow: hidden;
  height: 100%;
}

.hero-photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-trace {
  position: absolute;
  inset: 24px;
  bottom: auto;
  height: calc(100% - 48px);
  width: calc(100% - 48px);
  pointer-events: none;
}

@media (max-width: 900px) {
  .hero-photo-frame {
    position: static;
    inset: auto;
    border-left: none;
    border-top: 1px solid color-mix(in srgb, var(--ripple) 55%, transparent);
    order: -1;
  }
  .hero-photo-frame picture {
    aspect-ratio: 16 / 10;
    height: auto;
  }
}

.hero-trace path {
  fill: none;
  stroke: var(--mist);
  stroke-width: 2;
  stroke-linecap: round;
  opacity: 0.55;
  stroke-dasharray: 1400;
  stroke-dashoffset: 1400;
  animation: draw-trace 2.8s 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes draw-trace {
  to {
    stroke-dashoffset: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-trace path {
    animation: none;
    stroke-dashoffset: 0;
  }
}

.hero-photo-frame figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 28px 24px 14px;
  background: linear-gradient(to top, color-mix(in srgb, var(--ink) 75%, transparent), transparent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.01em;
  color: var(--foam);
  line-height: 1.6;
}

.hero-photo-frame figcaption a {
  color: var(--mist);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--foam) 40%, transparent);
}

/* ---------- motivation ---------- */

.motivation {
  margin: 0;
  max-width: 62ch;
}

.motivation p {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.35;
  margin: 0 0 22px;
  color: var(--paper-ink);
}

.motivation p:first-child {
  color: var(--gauge);
}

.motivation p:last-child {
  margin-bottom: 0;
}

/* ---------- section scaffolding ---------- */

section {
  padding: 96px 0;
}

.section-head {
  margin-bottom: 44px;
  max-width: var(--measure);
}

.section-head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.05;
  margin: 0 0 14px;
  color: var(--mist);
}

.section-head p {
  color: var(--foam);
  font-size: 17.5px;
  margin: 0;
}

section.on-paper {
  background: var(--paper);
  color: var(--paper-ink);
}

section.on-paper .section-head h2 {
  color: var(--paper-ink);
}

section.on-paper .section-head p {
  color: color-mix(in srgb, var(--paper-ink) 70%, transparent);
}

/* ---------- register table ---------- */

.compartment-glossary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  list-style: none;
  margin: 0 0 28px;
  padding: 14px 18px;
  background: var(--deep);
  border: 1px solid color-mix(in srgb, var(--ripple) 35%, transparent);
  font-family: var(--font-mono);
  font-size: 14.5px;
  color: var(--foam);
}

.compartment-glossary b {
  color: var(--mist);
  font-weight: 500;
  margin-right: 4px;
}

.register-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin-bottom: 20px;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.filter-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--foam);
  margin-right: 4px;
}

.chip {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--ripple) 55%, transparent);
  background: none;
  color: var(--foam);
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.chip.active {
  background: var(--mist);
  color: var(--ink);
  border-color: var(--mist);
}

.register-row.filtered-out {
  display: none;
}

.register-empty {
  padding: 24px 4px;
  color: var(--foam);
  font-size: 14.5px;
}

.register {
  border-top: 1px solid color-mix(in srgb, var(--ripple) 40%, transparent);
}

.register-row {
  display: grid;
  grid-template-columns: 1.9fr 1fr 1.1fr 1fr;
  gap: 16px;
  align-items: center;
  padding: 18px 4px;
  border-bottom: 1px solid color-mix(in srgb, var(--ripple) 25%, transparent);
}

.register-row.head {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--foam);
  padding-bottom: 12px;
}

.reg-name a {
  text-decoration: none;
  border-bottom: 1px dotted var(--foam);
}

.reg-name a:hover code,
.reg-name a:focus-visible code {
  color: var(--agency);
}

.reg-name a:hover,
.reg-name a:focus-visible {
  border-bottom-style: solid;
  border-bottom-color: var(--agency);
}

.reg-name code {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  color: var(--mist);
  background: none;
}

.reg-name small {
  display: block;
  font-weight: 400;
  color: var(--foam);
  font-size: 14px;
  margin-top: 4px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 2px;
  width: fit-content;
}

.badge.agency {
  color: var(--agency);
  border: 1px solid color-mix(in srgb, var(--agency) 55%, transparent);
}

.badge.research {
  color: var(--research);
  border: 1px dashed color-mix(in srgb, var(--research) 65%, transparent);
}

.badge.citizen {
  color: var(--citizen);
  background: color-mix(in srgb, var(--citizen) 16%, transparent);
  border: 1px solid color-mix(in srgb, var(--citizen) 55%, transparent);
}

.reg-compartments {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--foam);
}

.reg-status {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--foam);
}

.reg-status.stub {
  color: color-mix(in srgb, var(--foam) 55%, transparent);
  font-style: italic;
}

@media (max-width: 720px) {
  .register-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 18px 4px;
  }
  .register-row.head {
    display: none;
  }
}

/* ---------- viz embeds ---------- */

.viz-frame {
  width: 100%;
  border: 1px solid color-mix(in srgb, var(--ripple) 40%, transparent);
  background: var(--deep);
}

.viz-frame-coverage {
  height: 820px;
}

.viz-frame-crosswalk {
  height: 960px;
}

.viz-caption {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--foam);
}

.viz-caption a {
  color: var(--foam);
}

@media (max-width: 720px) {
  .viz-frame-coverage {
    height: 640px;
  }
  .viz-frame-crosswalk {
    height: 760px;
  }
}

/* ---------- quickstart ---------- */

.quickstart-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

@media (max-width: 860px) {
  .quickstart-grid {
    grid-template-columns: 1fr;
  }
}

pre.code {
  margin: 0;
  padding: 22px 24px;
  background: var(--deep);
  border: 1px solid color-mix(in srgb, var(--ripple) 45%, transparent);
  border-left: 3px solid var(--gauge);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--mist);
}

pre.code + pre.code {
  margin-top: 16px;
}

.code-label {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--foam);
  margin: 0 0 8px;
}

.tok-kw {
  color: var(--citizen);
}
.tok-str {
  color: var(--agency);
}
.tok-com {
  color: color-mix(in srgb, var(--foam) 70%, transparent);
}

.compartment-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 15.5px;
  color: var(--foam);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 20px;
}

.compartment-list b {
  color: var(--mist);
  font-weight: 500;
}

/* ---------- footer ---------- */

footer {
  padding: 56px 0 40px;
  border-top: 1px solid color-mix(in srgb, var(--ripple) 35%, transparent);
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 28px;
}

.footer-links {
  display: flex;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 14.5px;
}

.footer-links a {
  color: var(--foam);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--mist);
}

.footer-fine {
  font-size: 14px;
  color: color-mix(in srgb, var(--foam) 75%, transparent);
  line-height: 1.7;
}

.footer-fine a {
  color: inherit;
}