/* ================================================
   BRAID – Brain Frailty Integrated through Data Federation
   Design system – DARE UK Project
   ================================================ */

/* ---------- Tokens (light mode defaults) ---------- */
:root {
  --cyan:        #00CFFF;
  --cyan-text:   #007A9E;
  --pink:        #F07B8E;
  --white:       #FFFFFF;
  --dark:        #333344;   /* nav / hero / footer – always dark */
  --radius:      8px;
  --font:        'Inter', 'Segoe UI', Arial, sans-serif;

  /* Themeable */
  --bg:          #FFFFFF;
  --bg-alt:      #F5F7FA;
  --text:        #333344;
  --text-muted:  #555566;
  --border:      #E2E6EA;
  --card-bg:     #FFFFFF;
  --shadow:      0 2px 16px rgba(0,0,0,.08);

  /* Nav — always dark so logo backgrounds blend */
  --nav-bg:      #333344;
  --nav-border:  transparent;
  --nav-link:    rgba(255,255,255,.75);
  --nav-active:  #FFFFFF;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #0F0F1A;
    --bg-alt:      #1A1A2E;
    --text:        #E8E8F5;
    --text-muted:  #9090B0;
    --border:      #2A2A42;
    --card-bg:     #1A1A2E;
    --shadow:      0 2px 16px rgba(0,0,0,.35);
  }
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; color-scheme: light dark; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 1rem;
}
img { max-width: 100%; display: block; }
a { color: var(--cyan-text); text-decoration: none; }
a:hover,
a:focus-visible { color: var(--cyan); text-decoration: underline; }
a:focus-visible { outline: 3px solid rgba(0,207,255,.45); outline-offset: 3px; }

/* ---------- Utility ---------- */
.container { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }
.section    { padding: 4rem 0; }
.section--alt { background: var(--bg-alt); }
.text-center { text-align: center; }
.sr-only { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); }

/* ---------- Typography ---------- */
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; }
h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); margin-bottom: 1.2rem; }
h3 { font-size: 1.25rem; margin-bottom: .6rem; }
p  { margin-bottom: 1rem; color: var(--text-muted); }
p:last-child { margin-bottom: 0; }

.accent-cyan { color: var(--cyan); }
.accent-pink { color: var(--pink); }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  box-shadow: var(--shadow);
  transition: background .2s;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 1rem;
}
.nav-logo img {
  height: 52px;
  width: auto;
}
.nav-logo-fallback {
  display: flex;
  align-items: center;
  gap: .5rem;
  color: var(--nav-active);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: .02em;
}
.nav-logo-fallback span { color: var(--cyan); }

.nav-links {
  display: flex;
  list-style: none;
  gap: .25rem;
}
.nav-links a {
  color: var(--nav-link);
  padding: .5rem .9rem;
  border-radius: var(--radius);
  font-size: .95rem;
  transition: background .2s, color .2s;
}
.nav-links a:hover,
.nav-links a.active {
  background: rgba(0,207,255,.15);
  color: var(--cyan);
  text-decoration: none;
}

/* hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .4rem;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--nav-link); border-radius: 2px;
  transition: transform .25s;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--dark) 0%, #1a1a2e 60%, #16213e 100%);
  color: var(--white);
  padding: 5rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content:'';
  position:absolute; inset:0;
  background: radial-gradient(ellipse at 80% 50%, rgba(0,207,255,.12), transparent 60%),
              radial-gradient(ellipse at 20% 80%, rgba(240,123,142,.1), transparent 50%);
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
}
.hero-text h1 { color: #FFFFFF; margin-bottom: 1rem; }
.hero-text h1 em { color: var(--cyan); }
.hero-text h1 em { font-style: normal; color: var(--cyan); }
.hero-text .subtitle {
  font-size: 1.15rem;
  color: rgba(255,255,255,.85);
  max-width: 640px;
  margin-bottom: 2rem;
}
.hero-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-logo img {
  width: 200px;
  height: auto;
}

.badge-row {
  display: flex; flex-wrap: wrap; gap: .75rem;
  margin-bottom: 2rem;
}
.badge {
  background: rgba(0,207,255,.15);
  border: 1px solid rgba(0,207,255,.35);
  color: var(--cyan);
  padding: .3rem .85rem;
  border-radius: 999px;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.badge--pink {
  background: rgba(240,123,142,.15);
  border-color: rgba(240,123,142,.35);
  color: var(--pink);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.6rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .95rem;
  transition: transform .15s, box-shadow .15s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,0,0,.2); text-decoration: none; }
.btn:focus-visible { outline: 3px solid rgba(0,207,255,.45); outline-offset: 3px; }
.btn-primary { background: var(--cyan); color: var(--dark); }
.btn-outline  { background: rgba(255,255,255,.08); border: 2px solid rgba(255,255,255,.55); color: #FFFFFF; }

/* ---------- Lay Summary ---------- */
.lay-summary {
  background: var(--bg);
  padding: 3rem 0;
}
.lay-summary p { text-align: justify; }
.page-research p { text-align: justify; }
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.summary-card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 1.5rem;
  border-left: 4px solid var(--cyan);
}
.summary-card.pink-border { border-left-color: var(--pink); }
.summary-card h3 { color: var(--text); }

.summary-grid-2col {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}
.summary-grid-4col {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}
@media (max-width: 900px) {
  .summary-grid-4col { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .summary-grid-2col { grid-template-columns: 1fr; }
  .summary-grid-4col { grid-template-columns: 1fr; }
}

.card-icon {
  width: 44px; height: 44px;
  background: rgba(0, 207, 255, .12);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1rem;
}
.card-icon svg { width: 22px; height: 22px; stroke: var(--cyan); }
.card-icon.pink { background: rgba(240, 123, 142, .12); }
.card-icon.pink svg { stroke: var(--pink); }

/* ---------- Institutions strip ---------- */
.institutions {
  background: var(--bg-alt);
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
}
.institutions h3 {
  text-align: center;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.inst-logo-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2rem 3rem;
  list-style: none;
}
.inst-logo-strip li img {
  height: 52px;
  width: auto;
  object-fit: contain;
  opacity: .85;
  transition: opacity .2s;
}
.inst-logo-strip li img:hover { opacity: 1; }
@media (max-width: 640px) {
  .inst-logo-strip li img { height: 38px; }
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  background: linear-gradient(120deg, var(--dark) 0%, #1a1a2e 100%);
  padding: 3rem 0 2.5rem;
  color: var(--white);
}
.page-hero h1 { color: var(--white); margin-bottom: .5rem; }
.page-hero p  { color: rgba(255,255,255,.7); max-width: 640px; margin-bottom: 0; }

/* ---------- Research page ---------- */
.pub-year-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--cyan);
  margin: 2rem 0 .5rem;
  padding-bottom: .4rem;
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.pub-list { list-style: none; padding: 0; margin-bottom: 0; }
.pub-list li {
  padding: .85rem 0;
  border-bottom: 1px solid var(--border);
}
.pub-list li:last-child { border-bottom: none; }
.pub-title { font-weight: 600; color: var(--text); margin-bottom: .2rem; }
.pub-title a { color: var(--text); }
.pub-title a:hover { color: var(--cyan); }
.pub-meta  { font-size: .88rem; color: var(--text-muted); }

/* ---------- Team page ---------- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}
.team-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform .2s, box-shadow .2s;
}
.team-card:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,.12); }

.team-photo {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--light);
}
.team-photo-placeholder {
  width: 100%;
  aspect-ratio: 1;
  background: linear-gradient(135deg, rgba(0,207,255,.12), rgba(240,123,142,.12));
  display: flex;
  align-items: center;
  justify-content: center;
}
.team-photo-placeholder svg { width: 60px; height: 60px; opacity: .4; }

.section-heading-with-logo {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.inst-logo-header {
  height: 48px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
}
.team-name-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .75rem;
  margin-bottom: .1rem;
}
.team-name-row h3 { margin-bottom: 0; }
.team-org { display: flex; align-items: center; gap: .3rem; flex-shrink: 0; padding-top: .2rem; }
.inst-logo-inline {
  height: 28px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
}
.inst-logo-inline--lg {
  height: 44px;
}

.team-info { padding: 1.2rem; }
.team-info h3 { margin-bottom: .2rem; font-size: 1.05rem; color: var(--text); }
.team-role  { font-size: .88rem; color: var(--cyan); font-weight: 600; margin-bottom: .35rem; }
.team-org   { font-size: .82rem; color: var(--text-muted); margin-bottom: .6rem; }
.team-bio   { font-size: .88rem; color: var(--text-muted); margin-bottom: 0; line-height: 1.55; }

/* ---------- Documentation page ---------- */
.doc-group-heading {
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin: 2.25rem 0 0;
  padding-bottom: .4rem;
  border-bottom: 1px solid var(--border);
}
.doc-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 1rem;
  font-size: .875rem;
}
@media (max-width: 900px) {
  .doc-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 540px) {
  .doc-grid { grid-template-columns: 1fr; }
}
.doc-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color .2s, box-shadow .2s;
}
.doc-card h3 { font-size: .95rem; margin-bottom: .4rem; }
.doc-card:hover {
  border-color: var(--cyan);
  box-shadow: 0 4px 20px rgba(0,207,255,.1);
}
.doc-icon {
  width: 44px; height: 44px;
  background: rgba(0,207,255,.1);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1rem;
}
.doc-icon svg { color: var(--cyan); }

/* ---------- PIE page ---------- */
.pie-timeline { margin-top: 2rem; position: relative; }
.pie-timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan), var(--pink));
  border-radius: 2px;
}
.pie-item {
  position: relative;
  padding: 0 0 2.5rem 60px;
}
.pie-dot {
  position: absolute;
  left: 12px; top: 4px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--cyan);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 2px var(--cyan);
}
.pie-item:nth-child(even) .pie-dot { background: var(--pink); box-shadow: 0 0 0 2px var(--pink); }

.pie-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}
.pie-card h3 { margin-bottom: .4rem; }
.pie-tag {
  display: inline-block;
  background: rgba(0,207,255,.1);
  color: var(--cyan);
  font-size: .78rem;
  font-weight: 700;
  padding: .2rem .6rem;
  border-radius: 4px;
  margin-bottom: .75rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.pie-tag.pink { background: rgba(240,123,142,.1); color: var(--pink); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--dark);
  color: rgba(255,255,255,.6);
  padding: 2.5rem 0;
  font-size: .88rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.footer-inner a { color: var(--cyan); }
.footer-links { display: flex; gap: 1.5rem; flex-wrap: wrap; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-logo  { display: none; }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 70px; left: 0; right: 0;
    background: var(--nav-bg);
    border-top: 1px solid var(--border);
    padding: 1rem 1.5rem;
    gap: .25rem;
    box-shadow: 0 8px 16px rgba(0,0,0,.3);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .pie-timeline::before { left: 14px; }
  .pie-item { padding-left: 44px; }
  .pie-dot  { left: 6px; }
}

/* ---------- Home – news sidebar layout ---------- */
.home-body {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 3rem;
  align-items: start;
}

.news-feed {
  position: sticky;
  top: 5rem;
}

.news-feed-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.25rem;
  padding-bottom: .6rem;
  border-bottom: 2px solid var(--cyan);
  text-transform: uppercase;
  letter-spacing: .07em;
}

.news-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.news-item:last-child { border-bottom: none; }

.news-item-date {
  font-size: .75rem;
  color: var(--cyan);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: .25rem;
}

.news-item-title {
  font-weight: 600;
  font-size: .95rem;
  color: var(--text);
  margin-bottom: .35rem;
}

.news-item-body {
  font-size: .85rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
}

@media (max-width: 900px) {
  .home-body { grid-template-columns: 1fr; }
  .news-feed { position: static; border-top: 1px solid var(--border); padding-top: 2rem; }
}