/* Site-wide styles. Colours are defined once here and reused everywhere. */

/* Lato font, as on the original site (must stay at the top of the file). */
@import url("https://fonts.googleapis.com/css2?family=Lato:wght@300;400&display=swap");

:root {
  --text: #1f2933;
  --muted: #5f6b7a;
  --accent: #226e93;    /* teal, same as the headings */
  --bg: #ffffff;
  --bg-alt: #f4f6f9;
  --border: #e1e5eb;
  --heading: #226e93;   /* teal used for titles on the original site */
  --heading-dark: #212121;
  --max-width: 90rem;   /* ~1440px */
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Lato", Helvetica, Arial, sans-serif;
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

a {
  color: var(--accent);
}

img {
  max-width: 100%;
  height: auto;
}

/* ---------- Header and navigation ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.site-header .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
}

.site-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 400;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}

.site-title img {
  height: 2.2rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent);
}

/* ---------- Page banner ---------- */

.banner {
  height: 20rem;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;  /* title vertically centred */
}

.banner h1 {
  width: 100%;
  margin: 0;
  padding: 1rem;
  color: #fff;
  font-family: "Lato", sans-serif;
  font-weight: 300;
  font-size: clamp(2.5rem, 6vw, 4.5rem);  /* shrinks on phones, up to ~72px on desktop */
  letter-spacing: 0.5px;
  line-height: 1.1;
  text-align: center;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);  /* keeps white text readable on light photos */
}

/* Title + subtitle block (home page) */
.banner-text {
  width: 100%;
}

.banner .subtitle {
  margin: 0;
  padding: 0 1rem;
  color: #fff;
  font-family: "Lato", sans-serif;
  font-weight: 300;
  font-size: clamp(1.1rem, 2.2vw, 1.6rem);
  letter-spacing: 0.5px;
  text-align: center;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
}

/* ---------- Main content ---------- */

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1rem 3rem;
}

h2 {
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--heading);
  font-family: "Lato", sans-serif;
  font-weight: 300;
  font-size: 2.2rem;
  letter-spacing: 0.5px;
  line-height: 1.2;
}

h3 {
  margin-top: 1.25rem;
  margin-bottom: 0.4rem;
  color: var(--heading-dark);
  font-family: "Lato", sans-serif;
  font-weight: 400;
  font-size: 1.35rem;
  line-height: 1.25;
}

/* Section separator: thin light-grey line, as on the original site. */
hr {
  border: 0;
  height: 1px;
  background: rgba(0, 0, 0, 0.15);
  margin: 1.5rem 0;
}

/* Centred block of text (e.g. "Get in touch" on the home page). */
.centered {
  text-align: center;
}

/* No extra gap between a separator and the title right after it. */
hr + h2,
hr + .centered > h2:first-child,
hr + section > h2:first-child {
  margin-top: 0;
}

figure {
  margin: 1rem 0;
}

/* Pictures next to text in the narrow column (e.g. Outreach page). */
.side-by-side.small-image > img {
  max-width: 20rem;   /* ~320px; change this to resize all outreach pictures */
}

/* Stand-alone figures (e.g. Research page): limited width, centred. */
main > figure {
  max-width: 48rem;   /* ~770px; change this to resize all research figures */
  margin-left: auto;
  margin-right: auto;
}

figcaption {
  font-size: 0.9rem;
  color: var(--muted);
  text-align: center;
}

.credits {
  font-size: 0.85rem;
  color: var(--muted);
}

/* Text next to an image; stacks on narrow screens. */
.side-by-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: center;
}

.side-by-side.small-image {
  grid-template-columns: 2fr 1fr;
}

/* Add "flip" to put the picture on the left and the text on the right. */
.side-by-side.flip > :first-child {
  order: 2;
}

.side-by-side.small-image.flip {
  grid-template-columns: 1fr 2fr;
}

/* Section title sitting at the top of a text column, right above its text. */
.side-by-side h2 {
  margin-top: 0;
}

/* Picture on the right: align the text (and its title) against the picture. */
.side-by-side:not(.flip) > div:first-child {
  text-align: right;
}

.side-by-side:not(.flip) > div:first-child .links {
  justify-content: flex-end;
}

/* ...and push the picture to the left of its column, against the text. */
.side-by-side:not(.flip) > :last-child {
  justify-self: start;
}

.side-by-side:not(.flip) > figure img {
  margin-left: 0;
}

.side-by-side:not(.flip) > figure figcaption {
  text-align: left;
}

/* Picture on the left: push it to the right of its column, against the text. */
.side-by-side.flip > :last-child {
  justify-self: end;
}

.side-by-side.flip > figure img {
  margin-right: 0;
}

.side-by-side.flip > figure figcaption {
  text-align: right;
}

@media (max-width: 640px) {
  .side-by-side,
  .side-by-side.small-image,
  .side-by-side.small-image.flip {
    grid-template-columns: 1fr;
  }

  /* On phones, always show the text first, left-aligned. */
  .side-by-side.flip > :first-child {
    order: 0;
  }

  .side-by-side:not(.flip) > div:first-child {
    text-align: left;
  }

  .side-by-side:not(.flip) > div:first-child .links {
    justify-content: flex-start;
  }

  /* Stacked pictures line up on the left with the text above them. */
  .side-by-side.flip > :last-child {
    justify-self: start;
  }

  .side-by-side.flip > figure img {
    margin-right: auto;
    margin-left: 0;
  }

  .side-by-side.flip > figure figcaption {
    text-align: left;
  }
}

.portrait {
  border-radius: 0.5rem;
  max-width: 18rem;      /* ~290px; change this to resize the photo */
  justify-self: center;  /* centre it in its column */
}

/* Same size cap for an image inside a <figure> (centred above its caption). */
.small-photo {
  display: block;
  max-width: 18rem;
  margin: 0 auto;
}

/* Medium-size image (~530px, as the HERA photo on the original site). */
.medium-photo {
  display: block;
  max-width: 33rem;
  margin: 0 auto;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.2rem;
  padding: 0;
  list-style: none;
}

.button {
  display: inline-block;
  padding: 0.4rem 1rem;
  border: 1px solid var(--accent);
  border-radius: 0.3rem;
  text-decoration: none;
}

.video {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}

.site-footer .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem;
}