/* ===== MERV — Measuring Renewables Uptake & Value — distill-style theme ==
   Same look as the AGILE PhD School 2026 site (urbanbigdatacentre.github.io/
   agilephdschool2026): white fixed navbar, #1277A7 links, 50px black title,
   floating TOC, system sans typography, #0F2E3D dark footer.
========================================================================== */
:root {
  --primary-color: #1277a7;
  --title-color: #000000;
  --body-color: rgba(0, 0, 0, 0.8);
  --muted-color: rgba(0, 0, 0, 0.6);
  --rule-color: rgba(0, 0, 0, 0.1);
  --footer-bkgd: #0f2e3d;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
img { max-width: 100%; height: auto; }
html { scroll-behavior: smooth; }
h1[id], h2[id], h3[id] { scroll-margin-top: 4.5rem; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.06rem;
  line-height: 1.7;
  color: var(--body-color);
  background: #fff;
}

a { color: var(--primary-color); text-decoration: none; }
a:hover { color: #000; text-decoration: underline; }

/* ===== Fixed site header (white, like 2024) ============================== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 10;
  background: #fff;
  border-bottom: 1px solid var(--rule-color);
}
.site-nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; min-height: 56px; flex-wrap: wrap;
}
.nav-left, .nav-right { display: flex; align-items: center; gap: 18px; }
.logo img { height: 40px; display: block; }
.brand img { height: 40px; width: auto; display: block; }
.site-title {
  font-size: 18px; font-weight: 600; color: var(--primary-color);
}
.nav-link { font-size: 15px; color: var(--primary-color); white-space: nowrap; }
.site-title:hover, .nav-link:hover { color: #000; text-decoration: none; }
.nav-link.active { color: #000; box-shadow: inset 0 -2px 0 var(--primary-color); padding-bottom: 2px; }
.nav-github { display: inline-flex; align-items: center; }
.nav-toggle-box, .nav-toggle { display: none; }

/* ===== Article layout: centered text column ============================== */
.article {
  max-width: 730px;
  margin: 0 auto;
  padding: 56px 24px 40px; /* top offset for fixed header */
}

.d-title { padding: 4.5rem 0 1rem; }
.d-title h1 {
  font-size: 50px; font-weight: 700; line-height: 1.1;
  color: var(--title-color); margin: 0 0 0.6rem;
}
.d-title .acro { color: var(--primary-color); }
.subtitle {
  font-size: 1.45rem; line-height: 1.4; color: var(--muted-color);
  margin: 0 0 0.8rem;
}
.event-meta { font-size: 1rem; color: var(--muted-color); margin: 0; }

/* ===== "At a glance" card: left gutter on wide screens, hidden otherwise = */
.glance { display: none; }
@media (min-width: 1250px) {
  .glance {
    display: block; position: fixed; top: 110px;
    left: calc(50% - 365px - 240px); width: 200px;
    font-size: 13px; line-height: 1.5; color: var(--body-color);
  }
}
.glance img { width: 150px; height: auto; display: block; margin: 0 0 6px; }
.glance dl { margin: 0; }
.glance dt {
  margin-top: 11px; font-size: 11px; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase; color: rgba(0, 0, 0, 0.5);
}
.glance dd { margin: 1px 0 0; overflow-wrap: anywhere; }
.glance .tbc { font-size: 0.85em; }
.glance-vacancy {
  display: inline-block; margin-top: 16px; padding: 4px 10px; border-radius: 4px;
  background: rgba(46, 139, 87, 0.1); color: #2e8b57; font-size: 12px; font-weight: 600;
}
.glance-vacancy:hover { background: #2e8b57; color: #fff; text-decoration: none; }

/* ===== Hero figure & callout ============================================ */
.hero-figure { margin: 1.5rem 0 2rem; }
.hero-figure img { width: 100%; height: auto; display: block; border-radius: 2px; }
.hero-figure figcaption {
  font-size: 13px; color: var(--muted-color); margin-top: 0.5em; line-height: 1.5;
}
.callout {
  background: rgba(18, 119, 167, 0.07);
  border-left: 4px solid var(--primary-color);
  padding: 0.9rem 1.1rem;
  margin: 0 0 2.5rem;
}

/* ===== Headings & text =================================================== */
h2 {
  font-size: 24px; font-weight: 700; color: rgba(0, 0, 0, 0.85);
  margin: 2.6rem 0 0.9rem; line-height: 1.25;
  border-top: 1px solid var(--rule-color); padding-top: 2.2rem;
}
h3 { font-size: 19px; font-weight: 600; color: rgba(0, 0, 0, 0.85); margin: 1.8rem 0 0.6rem; }
p, ul, ol { margin: 0 0 1em; }
.note { font-style: italic; color: var(--muted-color); }

/* ===== Programme tables ================================================== */
.schedule {
  width: 100%; border-collapse: collapse;
  font-size: 0.97rem; margin: 0 0 1.4rem;
}
.schedule td {
  padding: 0.5rem 0.6rem 0.5rem 0; border-top: 1px solid var(--rule-color);
  vertical-align: top;
}
.schedule tr:last-child td { border-bottom: 1px solid var(--rule-color); }
.schedule td:first-child {
  white-space: nowrap; width: 7rem; color: var(--muted-color);
  font-variant-numeric: tabular-nums;
}
.schedule .break { color: var(--muted-color); font-style: italic; }
.who { color: var(--muted-color); font-size: 0.93em; }

/* ===== People, sponsors, appendix, footer ================================ */
.people { columns: 2; column-gap: 2.5rem; }
.people li { break-inside: avoid; margin: 0.2rem 0; }

.sponsors {
  display: flex; align-items: center; gap: 2.5rem; flex-wrap: wrap;
  margin: 1.2rem 0 0.5rem;
}
.sponsors img { height: 56px; width: auto; display: block; }
.sponsors img.logo-lg { height: 92px; }
.sponsor-text {
  font-size: 1.15rem; font-weight: 700; line-height: 1.15;
  color: rgba(0, 0, 0, 0.75); letter-spacing: 0.01em;
}
.sponsor-text span { display: block; font-weight: 400; }
.sponsor-text:hover { color: var(--primary-color); text-decoration: none; }

.appendix {
  margin-top: 3.5rem; border-top: 1px solid var(--rule-color);
  padding-top: 1.5rem; font-size: 0.85rem; color: var(--muted-color);
  line-height: 1.6;
}
.appendix h3 {
  font-size: 15px; font-weight: 500; color: rgba(0, 0, 0, 0.65);
  margin: 1.2rem 0 0.3rem;
}
.appendix a { color: var(--muted-color); text-decoration: underline; }
.appendix a:hover { color: var(--primary-color); }

.site-footer {
  background: var(--footer-bkgd);
  color: rgba(255, 255, 255, 0.8);
  font-size: 15px; text-align: center;
  margin-top: 30px; padding: 30px 20px;
}
.site-footer a { color: #fff; text-decoration: underline; }

/* ===== Mobile =========================================================== */
@media (max-width: 900px) {
  .nav-toggle {
    display: block; cursor: pointer; font-size: 22px;
    color: var(--primary-color); padding: 12px 4px;
  }
  .nav-left .nav-link { display: none; }
  .site-title { font-size: 16px; }
  .nav-right {
    display: none; width: 100%; flex-direction: column;
    align-items: flex-start; gap: 0; padding: 0 0 10px;
  }
  .nav-toggle-box:checked ~ .nav-right { display: flex; }
  .nav-right .nav-link { padding: 8px 0; }
  .d-title { padding-top: 3rem; }
  .d-title h1 { font-size: 34px; }
  .subtitle { font-size: 1.2rem; }
  .people { columns: 1; }
  .schedule td:first-child { width: 5.6rem; white-space: normal; }
}

/* ===== MERV additions ==================================================== */
/* Floating back-to-top button (shown by script once scrolled past the hero) */
.back-to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 9;
  width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--primary-color); color: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.22);
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
}
.back-to-top.show { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { background: var(--footer-bkgd); color: #fff; text-decoration: none; }
@media print { .back-to-top { display: none; } }
/* Hero: two photos side by side */
.hero-pair {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  margin: 1.5rem 0 2rem;
}
.hero-pair figure { margin: 0; }
.hero-pair img {
  width: 100%; height: 250px; object-fit: cover; display: block; border-radius: 2px;
}
.hero-pair figcaption {
  font-size: 13px; color: var(--muted-color); margin-top: 0.5em; line-height: 1.5;
}
@media (max-width: 600px) {
  .hero-pair { grid-template-columns: 1fr; }
  .hero-pair img { height: 200px; }
}
/* Vacancy notice: same callout, green accent so it reads as a separate box */
.callout.vacancy {
  border-left-color: #2e8b57;
  background: rgba(46, 139, 87, 0.08);
  margin-bottom: 1.2rem;
}
/* Draft placeholders — remove the .tbc spans once the facts are confirmed */
.tbc {
  display: inline-block; background: #fff3cd; color: #7a5200;
  border: 1px solid #f0d58c; border-radius: 3px;
  font-size: 0.78em; font-style: normal; font-weight: 600;
  line-height: 1.5; padding: 0 0.45em; vertical-align: middle;
}

/* Team list: single column, name — role */
.team { list-style: none; padding: 0; margin: 0 0 1.4em; }
.team li { margin: 0.3rem 0; }
.team .role { color: var(--muted-color); }

/* Small statistics table (uptake figures) */
.stats {
  width: 100%; border-collapse: collapse;
  font-size: 0.97rem; margin: 0.6rem 0 1.4rem;
}
.stats th, .stats td {
  padding: 0.45rem 0.6rem 0.45rem 0; border-top: 1px solid var(--rule-color);
  text-align: left; vertical-align: top;
}
.stats th { font-weight: 600; color: rgba(0, 0, 0, 0.85); border-top: none; }
.stats tr:last-child td { border-bottom: 1px solid var(--rule-color); }
.stats .num { text-align: right; width: 6rem; font-variant-numeric: tabular-nums; }
.table-note { font-size: 0.85rem; margin: -1rem 0 1.4rem; }

/* Objectives: numbered with a little breathing room */
.objectives li { margin: 0.45em 0; }

/* Output lists */
.outputs li { margin: 0.35em 0; }
.outputs .meta { color: var(--muted-color); font-size: 0.93em; }
.empty { color: var(--muted-color); font-style: italic; }

/* Funder / host logos (reuses .sponsors sizing) */
.logos img { height: 52px; }
.logos img.logo-wide { height: 64px; }