/* PyHydroGeophysX site styling.
 *
 * Two brand colours only: a water blue taken from the logo, used for links,
 * buttons and active navigation, and an earth tone, reserved for the one
 * relationship the homepage diagram exists to show. Individual geophysical
 * methods deliberately share the theme's neutral colours, so the site does not
 * read as a catalogue of features.
 */

/* The accent carries text: links, the eyebrow, card footers and the active
   navigation item, so it has to stay readable on white (4.97:1 here).
   A filled button has the opposite problem - a large block of that same colour
   reads as heavy - so it gets a brighter fill and dark text instead, which is
   lighter on the page and still 4.95:1. */
:root {
  --phgx-accent: #12799a;
  --phgx-accent-strong: #0e6480;
  --phgx-accent-wash: rgba(18, 121, 154, 0.08);
  --phgx-btn-bg: #22a2c4;
  --phgx-btn-bg-hover: #2aa9cb;
  --phgx-btn-text: #052c36;
  --phgx-earth: #8a5a24;
  --phgx-border: rgba(16, 24, 32, 0.15);
  --phgx-plate: #ffffff;
}

html[data-theme="dark"] {
  --phgx-accent: #7fd0e6;
  --phgx-accent-strong: #a6e0f0;
  --phgx-accent-wash: rgba(127, 208, 230, 0.12);
  --phgx-btn-bg: #7fd0e6;
  --phgx-btn-bg-hover: #a6e0f0;
  --phgx-btn-text: #0b1116;
  --phgx-earth: #e0ae74;
  --phgx-border: rgba(255, 255, 255, 0.18);
  --phgx-plate: #f4f5f7;
}

/* Give sphinx-design's filled buttons the same treatment, so every primary
   button on the site matches. The theme sets these under html[data-theme=...],
   so the override has to be scoped the same way to win; site.css loads after
   the theme, which settles the tie. Link and navigation colours are left to
   the theme, which already ships an accessible pair. */
html[data-theme="light"],
html[data-theme="dark"] {
  --sd-color-primary: var(--phgx-btn-bg);
  --sd-color-primary-highlight: var(--phgx-btn-bg-hover);
  --sd-color-primary-text: var(--phgx-btn-text);
}

/* ------------------------------------------------------------------ layout */

/* Long text reads better narrow than the theme's 60em default. The homepage
   and the usage dashboard opt back out, because cards and a world map need the
   width. The selector repeats the theme's own ancestors because that is what
   its 60em rule is written with; :has() is unsupported on old browsers, which
   simply keeps 54em everywhere. */
.bd-main .bd-content .bd-article-container {
  max-width: 54em;
}

.bd-main .bd-content .bd-article-container:has(.phgx-hero),
.bd-main .bd-content .bd-article-container:has(#phgx-stats) {
  max-width: 76rem;
}

/* ------------------------------------------------------------------- video */

/* Keep the installation video responsive without reserving a fixed desktop width. */
.setup-video { position: relative; aspect-ratio: 16 / 9; width: 100%; margin: 1rem 0; }
.setup-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; border-radius: 8px; }

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

.phgx-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 3.5rem;
  align-items: center;
  padding: 1rem 0 0.5rem;
}

.phgx-hero__eyebrow {
  margin: 0 0 0.6rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--phgx-accent);
}

.phgx-hero__title {
  margin: 0 0 0.75rem;
  font-size: clamp(2.1rem, 4.4vw, 3rem);
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.phgx-hero__lead {
  margin: 0 0 0.9rem;
  font-size: clamp(1.1rem, 1.8vw, 1.32rem);
  line-height: 1.38;
  font-weight: 500;
}

.phgx-hero__body {
  margin: 0 0 1.6rem;
  max-width: 34em;
  color: var(--pst-color-text-muted);
}

.phgx-hero__actions,
.phgx-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0 0 1rem;
}

.phgx-actions {
  margin: 1.5rem 0 1.25rem;
}

.phgx-hero__more {
  margin: 0;
  font-weight: 600;
}

.phgx-btn {
  display: inline-block;
  padding: 0.68rem 1.3rem;
  border: 1px solid var(--phgx-border);
  border-radius: 8px;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none !important;
  color: var(--pst-color-text-base);
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.phgx-btn:hover {
  border-color: var(--phgx-accent);
  color: var(--phgx-accent);
  background: var(--phgx-accent-wash);
}

.phgx-btn--primary,
.phgx-btn--primary:hover {
  background: var(--phgx-btn-bg);
  border-color: var(--phgx-btn-bg);
  color: var(--phgx-btn-text);
}

/* Hover brightens rather than darkens, so the label keeps its contrast. */
.phgx-btn--primary:hover {
  background: var(--phgx-btn-bg-hover);
  border-color: var(--phgx-btn-bg-hover);
}

/* --------------------------------------------------------- hero flow chart */

/* The diagram inherits the page text colour, so one drawing serves both
   themes. Only the compare link departs from it. */
.phgx-flow {
  display: block;
  width: 100%;
  max-width: 470px;
  height: auto;
  margin: 0 auto;
}

.phgx-flow__box rect {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  opacity: 0.32;
}

.phgx-flow__link path {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  opacity: 0.55;
}

.phgx-flow__label text {
  fill: currentColor;
  font-size: 13px;
}

.phgx-flow__sub text {
  fill: currentColor;
  font-size: 11.5px;
  opacity: 0.72;
}

/* The one relationship the diagram exists to show: a prediction and a
   measurement of the same thing, held against each other. It is the only part
   of the drawing that leaves the neutral palette. */
.phgx-flow__compare {
  color: var(--phgx-earth);
}

.phgx-flow__compare-head {
  fill: var(--phgx-earth);
}

.phgx-flow__note {
  font-size: 11.5px;
  font-weight: 600;
  fill: currentColor;
}

/* ---------------------------------------------------------------- sections */

/* Give the homepage blocks enough air to read as a page rather than as one
   long document. Scoped to the homepage through the hero. */
.phgx-hero ~ section {
  margin-top: 4.5rem;
}

.phgx-hero ~ section > h2 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
}

/* ------------------------------------------------------------------- cards */

.sd-card {
  border-radius: 11px;
  border: 1px solid var(--phgx-border);
  box-shadow: none;
  transition: border-color 0.15s ease;
}

.phgx-cards .sd-card:hover {
  border-color: var(--phgx-accent);
}

.phgx-cards .sd-card-title {
  font-size: 1.04rem;
  font-weight: 650;
  line-height: 1.3;
}

.phgx-cards .sd-card-body {
  padding: 1.15rem 1.25rem;
}

.phgx-cards .sd-card-footer {
  border-top: 1px solid var(--phgx-border);
  padding: 0.7rem 1.25rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--phgx-accent);
}

.phgx-cards .sd-card-footer p::after {
  content: " \2192";
}

/* One shared aspect ratio, so cards line up. The figures are contained rather
   than cropped: a scientific figure with its axes cut off is worse than a
   little empty space. */
.phgx-cards .sd-card-img-top {
  /* 5:2 rather than 16:9, because these sections are panoramic: every figure
     used here is wider than 16:9, so a taller box would only add empty space. */
  aspect-ratio: 5 / 2;
  width: 100%;
  object-fit: contain;
  background: var(--phgx-plate);
  padding: 0.5rem;
  border-bottom: 1px solid var(--phgx-border);
  border-radius: 11px 11px 0 0;
}

/* -------------------------------------------------------------------- tags */

.phgx-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.9rem 0 1.1rem;
}

.phgx-tag {
  display: inline-block;
  padding: 0.36rem 0.9rem;
  border: 1px solid var(--phgx-border);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none !important;
  color: var(--pst-color-text-base);
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.phgx-tag:hover {
  border-color: var(--phgx-accent);
  background: var(--phgx-accent-wash);
  color: var(--phgx-accent);
}

/* MODFLOW and ParFlow are the hydrological end of the same list, so they carry
   the earth tone rather than the water blue. This is a distinction between two
   kinds of thing, not per-method decoration. */
.phgx-tag--hydro:hover {
  border-color: var(--phgx-earth);
  background: transparent;
  color: var(--phgx-earth);
}

/* ------------------------------------------------------------------- demos */

.phgx-demos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 1.5rem 0 0;
}

.phgx-demo {
  margin: 0;
}

.phgx-demo .setup-video {
  margin: 0;
}

.phgx-demo figcaption {
  margin-top: 0.7rem;
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--pst-color-text-muted);
}

/* ------------------------------------------------------------------ narrow */

@media (max-width: 900px) {
  .phgx-hero {
    grid-template-columns: 1fr;
    gap: 2.25rem;
  }

  .phgx-hero ~ section {
    margin-top: 3.25rem;
  }
}