/* Modern overrides for DECILE lab site
   - Uses Inter for UI and Merriweather for headings
   - CSS variables for colors
   - Lightweight responsive layout improvements
*/
:root{
  --brand-500:#0b5fff; /* primary blue */
  --muted:#6b7280;
  --bg:#ffffff;
  --surface:#f8fafc;
  --accent:#28aaff;
  --max-width:1100px;
}

/* Base typography */
body{
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  color:var(--muted);
  background:var(--bg);
}

h1,h2,h3{font-family: Merriweather, Georgia, serif; color:#0f1724; margin:0.25em 0 0.5em}
h1{font-size:2rem}
h2{font-size:1.4rem}

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

/* Header */
.site-header{
  background:#fff;
  position:sticky;
  top:0;
  z-index:100;
  box-shadow:0 1px 3px rgba(0,0,0,0.05);
  border-bottom:1px solid #e5e7eb;
}

.navbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0.75rem 1.5rem;
  max-width:var(--max-width);
  margin:0 auto;
}

.navbar__logo{
  display:flex;
  align-items:center;
  flex-shrink:0;
}

.navbar__logo img{
  height:48px;
  display:block;
}

.navbar__menu-btn{
  display:none;
  background:transparent;
  border:0;
  font-size:1.5rem;
  padding:0.5rem;
  cursor:pointer;
  color:#374151;
  position:relative;
  width:40px;
  height:40px;
  align-items:center;
  justify-content:center;
}

.navbar__menu-icon{
  display:block;
  width:24px;
  height:2px;
  background:#374151;
  position:relative;
  transition:all 0.3s ease;
}

.navbar__menu-icon:before,
.navbar__menu-icon:after{
  content:'';
  position:absolute;
  width:24px;
  height:2px;
  background:#374151;
  left:0;
  transition:all 0.3s ease;
}

.navbar__menu-icon:before{top:-7px}
.navbar__menu-icon:after{top:7px}

.navbar__menu{
  margin-left:auto;
}

.navbar__list{
  display:flex;
  gap:0.5rem;
  align-items:center;
  list-style:none;
  margin:0;
  padding:0;
}

.navbar__item a{
  color:#4b5563;
  text-decoration:none;
  padding:0.5rem 1rem;
  border-radius:6px;
  font-weight:600;
  font-size:0.95rem;
  transition:all 0.2s ease;
  display:block;
}

.navbar__item a:hover{
  background:#f3f4f6;
  color:#0b5fff;
}

.navbar__close-btn{
  display:none;
}

/* Mobile nav styles */
@media(max-width:800px){
  .navbar__menu-btn{
    display:flex;
  }
  
  .navbar__menu{
    position:fixed;
    top:0;
    right:-100%;
    width:min(320px, 80vw);
    height:100vh;
    background:#fff;
    box-shadow:-4px 0 12px rgba(0,0,0,0.1);
    transition:right 0.3s ease;
    margin:0;
    z-index:1000;
  }
  
  .navbar__scroller{
    height:100%;
    overflow-y:auto;
  }
  
  .navbar__inner{
    padding:1.5rem;
  }
  
  .navbar__close-btn{
    display:flex;
    margin-left:auto;
    margin-bottom:2rem;
  }
  
  .navbar__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  
  .navbar__item{
    border-bottom:1px solid #f3f4f6;
  }
  
  .navbar__item a{
    padding:1rem 0;
    border-radius:0;
  }
  
  /* Open state */
  .js-nav-open{
    overflow:hidden;
  }
  
  .js-nav-open .navbar__menu{
    right:0;
  }
  
  .js-nav-open .navbar__menu-icon{
    background:transparent;
  }
  
  .js-nav-open .navbar__menu-icon:before{
    transform:rotate(45deg);
    top:0;
  }
  
  .js-nav-open .navbar__menu-icon:after{
    transform:rotate(-45deg);
    top:0;
  }
}

/* Desktop - hide mobile elements */
@media(min-width:801px){
  .navbar__menu-btn{display:none}
  .navbar__close-btn{display:none}
  .navbar__scroller{display:contents}
  .navbar__inner{display:contents}
}

/* Hero */
.section.hero{padding:2.5rem 0}
.section__title{color:#0f1724}
.section__copy p{color:var(--muted);line-height:1.6;font-size:1rem}

/* Modules / cards */
.section .card{border-radius:10px}
.btn--secondary{border-radius:8px}

/* Team grid */
.flex-4{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.5rem}

/* Gray box only for main Team section (flex-4) */
.flex-4 .box.person{
  background:var(--surface) !important;
  padding:2rem 1.5rem 1.75rem 1.5rem !important;
  border-radius:10px;
  text-align:center;
  transition:transform 0.2s ease, box-shadow 0.2s ease;
  border:1px solid transparent;
  min-width:220px;
}
.flex-4 .box.person:hover{
  transform:translateY(-3px);
  box-shadow:0 4px 12px rgba(0,0,0,0.08);
  border-color:#e5e7eb;
}

/* No background for researchers and interns (flex2) */
.flex2 .box.person{
  background:transparent;
  padding:0.9rem;
  text-align:center;
  transition:transform 0.2s ease;
}
.flex2 .box.person:hover{
  transform:translateY(-3px);
}

/* Common styles for all person boxes */
.box.person a{
  text-decoration:none;
  color:inherit;
  display:block;
}
.box.person .image.round{
  margin:0 auto 0.75rem;
  width:120px;
  height:120px;
}
.box.person .image.round img{
  width:120px;
  height:120px;
  object-fit:cover;
  border-radius:999px;
  border:3px solid #fff;
  box-shadow:0 2px 8px rgba(0,0,0,0.1);
}
.box.person h4{margin:0.5rem 0 0.25rem;font-size:1rem;color:#0f1724;font-weight:600}
.box.person p{margin:0;font-size:0.9rem;color:var(--muted);line-height:1.4}

/* Fix centering for researchers section */
.flex2.flex-5{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:flex-start;
  margin:0 auto;
  padding:0;
  max-width:100%;
}

.flex2.flex-5 .box{
  width:20%;
  min-width:180px;
  flex:0 0 auto;
}

/* Responsive team grid */
@media(max-width:640px){
  .flex-4{grid-template-columns:repeat(2, 1fr);gap:0.75rem}
  .box.person{padding:0.75rem 0.5rem}
  .box.person .image.round,
  .box.person .image.round img{width:100px;height:100px}
  .flex2.flex-5 .box{width:50%;min-width:140px}
}


/* Papers list */
.paper{padding:0.85rem 0;border-bottom:1px solid rgba(15,23,36,0.04)}
.paper .paper-title{display:block;color:var(--brand-500);font-weight:700;text-decoration:none}
.paper .paper-authors{color:var(--muted);font-size:0.95rem}
.paper .paper-conference{color:#94a3b8;font-size:0.85rem}

/* Needs Section - Clean Card Layout */
.needs-section{padding:3rem 0 !important}
.needs-grid{
  display:grid !important;
  grid-template-columns:repeat(auto-fit, minmax(240px, 1fr)) !important;
  gap:1.5rem !important;
  margin-top:1rem !important;
}
.need-card{
  background:rgba(255,255,255,0.1) !important;
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,0.2) !important;
  border-radius:12px !important;
  padding:1.75rem 1.5rem !important;
  text-align:center !important;
  transition:transform 0.2s ease, box-shadow 0.2s ease !important;
  box-shadow:0 2px 8px rgba(0,0,0,0.1) !important;
}
.need-card:hover{
  transform:translateY(-4px) !important;
  box-shadow:0 8px 24px rgba(0,0,0,0.15) !important;
  background:rgba(255,255,255,0.15) !important;
}
.need-icon{
  font-size:2.5rem !important;
  margin-bottom:0.75rem !important;
  filter:drop-shadow(0 2px 4px rgba(0,0,0,0.1));
  display:block !important;
}
.need-card h3{
  color:#fff !important;
  font-size:1.1rem !important;
  margin:0.5rem 0 0.75rem !important;
  font-weight:700 !important;
}
.need-card p{
  color:rgba(255,255,255,0.9) !important;
  font-size:0.9rem !important;
  line-height:1.5 !important;
  margin:0 !important;
}

@media(max-width:640px){
  .needs-grid{
    grid-template-columns:1fr;
    gap:1rem;
  }
  .need-card{padding:1.5rem 1.25rem}
}

/* MeLM Research Section */
.section--melm{
  padding:4rem 0 !important;
  background:linear-gradient(135deg, #f8fafc 0%, #ffffff 100%) !important;
}

.melm-threads-grid{
  display:grid !important;
  grid-template-columns:repeat(auto-fit, minmax(280px, 1fr)) !important;
  gap:2rem !important;
  margin-top:2rem !important;
}

.melm-thread-card{
  background:#fff !important;
  border:1px solid #e5e7eb !important;
  border-radius:12px !important;
  padding:2rem 1.75rem !important;
  transition:all 0.3s ease !important;
  box-shadow:0 1px 3px rgba(0,0,0,0.05) !important;
}

.melm-thread-card:hover{
  transform:translateY(-4px) !important;
  box-shadow:0 12px 24px rgba(0,0,0,0.1) !important;
  border-color:#0b5fff !important;
}

.melm-thread-icon{
  font-size:2.5rem !important;
  margin-bottom:1rem !important;
  display:inline-block !important;
}

.melm-thread-card h3{
  color:#0f1724 !important;
  font-size:1.15rem !important;
  font-weight:700 !important;
  margin:0.75rem 0 1rem !important;
  line-height:1.4 !important;
}

.melm-thread-card > p{
  color:#6b7280 !important;
  font-size:0.95rem !important;
  line-height:1.6 !important;
  margin-bottom:1.25rem !important;
}

.melm-research-areas{
  list-style:none !important;
  padding:0 !important;
  margin:0 !important;
}

.melm-research-areas li{
  color:#4b5563 !important;
  font-size:0.875rem !important;
  padding:0.5rem 0 !important;
  padding-left:1.5rem !important;
  position:relative !important;
  line-height:1.5 !important;
}

.melm-research-areas li:before{
  content:"▸" !important;
  color:#0b5fff !important;
  position:absolute !important;
  left:0 !important;
  font-weight:700 !important;
}

@media(max-width:768px){
  .melm-threads-grid{
    grid-template-columns:1fr;
    gap:1.5rem;
  }
  .melm-thread-card{
    padding:1.5rem 1.25rem;
  }
}


/* Footer tweaks */
.site-footer{background:#0f1724;color:#e6eef8;padding:2rem 1rem}
.site-footer a{opacity:0.9}

/* Utility */
.align-center{text-align:center}

/* Small improvements */
img{max-width:100%;height:auto}

/* Reduce specificity conflicts by using root-level overrides where needed */
@media(max-width:800px){
  .section.hero{padding:1.5rem 0}
  h1{font-size:1.6rem}
}