/* ---------- Design tokens ---------- */
:root{
  --bg:#ffffff;
  --ink:#0a0a0a;
  --muted:#626262;
  --rule:#e6e6e6;
  --accent:#5a4df5;
  --accent-2:#8b82ff;

  --font-body:"Inter", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  --font-display:"Fraunces", Georgia, "Times New Roman", serif;

  --max: 960px;
  --rad: 14px;
}

/* ---------- Base ---------- */
*{ box-sizing: border-box; }
html,body{ margin:0; padding:0; }
html{ -webkit-text-size-adjust: 100%; }
body{
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1,h2,h3{
  font-family: var(--font-display);
  letter-spacing: 0;
  margin: 0 0 .5rem 0;
}
h1{ font-size: clamp(2rem, 4.2vw, 2.75rem); line-height: 1.12; text-wrap: balance; }
h2{ font-size: clamp(1.25rem, 2.4vw, 1.5rem); line-height: 1.2; }
.container{ max-width: var(--max); margin: 0 auto; padding: 0 32px; }

/* ---------- Header ---------- */
.site-header{
  position: sticky; top:0; z-index: 20;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--rule);
}

/* Mobile header adjustments */
@media (max-width: 768px) {
  .site-header {
    background: rgba(255,255,255,.95);
  }
}
.nav{ display:flex; align-items:center; justify-content:space-between; min-height:60px; }
.brand{ font-weight:700; letter-spacing:.2px; text-decoration:none; color:var(--ink); }
.nav-links a{ color:#222; text-decoration:none; margin-left:14px; font-size:.95rem; }
.nav-links a:hover{ color:var(--accent); }

/* Hide mobile nav toggle on larger screens */
.nav-toggle { display: none; }

/* Conference badge */
.venue-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 8px;
}

.venue-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 9999px;
  background: rgba(107, 92, 255, 0.08); /* soft accent */
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: 400;
  font-size: 1rem;
  letter-spacing: 0.2px;
  text-transform: none;
  box-shadow: 0 6px 20px rgba(107, 92, 255, 0.12);
  white-space: nowrap;
  flex-wrap: nowrap;
}

.venue-location {
  font-weight: 400;
}

.conference-name {
  font-weight: 700;
}





/* ---------- Hero ---------- */
.hero{ padding: 56px 0 22px; text-align: center; }
.eyebrow{
  color:#2a2a2a; text-transform:uppercase; letter-spacing:.12em;
  font-weight:700; font-size:.76rem;
}
.authors{
  margin-top: 10px;
  font-size: 1.06rem; font-weight: 600; color: #151515; letter-spacing:.2px; text-wrap: balance; word-spacing:.2rem;
}
.lab{ margin-top: 2px; color: var(--muted); }

/* ---------- Hero figure (matte-style) ---------- */
.hero-figure{
  margin: 18px auto 10px; max-width: var(--max);
  overflow: hidden;
}
.hero-figure img{ display:block; width:100%; height:auto; border-radius: 10px; }
.hero-video-wrap{
  position:relative;
  border-radius: 10px;
  overflow:hidden;
  background: #fff;
}
.hero-figure video{ 
  display:block; 
  width:100%; 
  height:auto; 
  border-radius: 10px;
  object-fit: contain;
}

/* ---------- CTA (editorial buttons) ---------- */
.cta{ display:flex; flex-wrap:wrap; gap:10px; justify-content:center; margin-top: 14px; }
.btn{
  display:inline-flex; align-items:center; gap:10px;
  padding: 10px 14px; border-radius: 12px; font-weight: 600;
  border: 1px solid var(--rule); background:#fff; color: var(--ink);
  text-decoration:none; transition: transform .12s ease, border-color .12s ease, box-shadow .12s ease;
  min-width: 120px; justify-content: center;
}
.btn:hover{ transform: translateY(-1px); border-color:#d5d5d5; box-shadow: 0 6px 18px rgba(0,0,0,.06); }
.btn.primary{ 
  background: #fff; 
  color: var(--accent); 
  border-color: var(--accent);
  box-shadow: 0 6px 18px rgba(107, 92, 255, 0.08);
}
.btn.primary:hover{ 
  box-shadow: 0 8px 24px rgba(107, 92, 255, 0.15);
  border-color: var(--accent-2);
}
.btn.small{ padding:8px 12px; font-size:.92rem; }
.btn.disabled{ 
  background: #f8f8f8; 
  color: var(--muted); 
  border-color: #e0e0e0;
  cursor: not-allowed;
  opacity: 0.6;
}
.btn.disabled:hover{ 
  transform: none; 
  box-shadow: none; 
  border-color: #e0e0e0;
}

/* Icon sizing */
.icon{ width: 22px; height: 22px; display:inline-block; }
.icon-lg{ width: 22px; height: 22px; } /* slightly larger for PDF/X */
.btn.primary .icon{ 
  color: var(--accent) !important;
}
.btn.primary .icon path{
  stroke: currentColor;
  stroke-width: 5;
  stroke-linejoin: round;
  stroke-linecap: round;
}

/* ---------- Sections ---------- */
.section{ padding: 36px 0; border-top: 1px solid var(--rule); }
.section-lede{ color: var(--muted); max-width: 70ch; margin: 0 auto; text-align: left; }
.rule{ height:1px; background: var(--rule); margin: 26px 0; }

/* ---------- Video ---------- */
.video-section {
  background: #000;
  padding: 36px 0;
  border-top: 1px solid var(--rule);
  width: 100%;
}

.video-wrap{
  position:relative;
  border:0px solid var(--rule); border-radius: var(--rad);
  overflow:hidden; box-shadow: 0 6px 24px rgba(0,0,0,.08);
  background: #fff;
}
.video-wrap iframe, .video-wrap video{ 
  width:100%; 
  height:auto;
  display:block; 
  border:0; 
  background:#fff;
}

/* Ensure consistent video sizing in grid regardless of text length */
.video-grid .video-wrap {
  aspect-ratio: 16/9;
}

.video-grid .video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- Video Grid ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 1.5rem;
}

.video-item {
  display: flex;
  flex-direction: column;
  height: 100%; /* Ensure consistent height in grid */
}

.video-item h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  color: var(--ink);
}

.video-item .video-wrap {
  margin-bottom: 0.75rem;
  /* Remove flex-grow so video size is consistent */
}

.video-item p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.5;
  flex-grow: 1; /* Let text area take remaining space */
}

.video-cta {
  text-align: center;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: 1.1rem;
}

.video-cta.intro {
  text-align: left;
  margin-top: 0;
  margin-bottom: 2rem;
  padding: 1.25rem;
  border: 1px solid var(--rule);
  border-radius: var(--rad);
  background: rgba(90, 77, 245, 0.02);
  border-top: 1px solid var(--rule);
  font-size: 1rem;
  line-height: 1.6;
}

.video-cta a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.video-cta a:hover {
  color: var(--accent-2);
  text-decoration: underline;
}

/* ---------- Code / BibTeX ---------- */
pre{
  background:#0b0b0b; color:#fff;
  border-radius:12px; padding:14px 16px; overflow:auto; font-size:.95rem;
  box-shadow: 0 6px 18px rgba(0,0,0,.12);
}

/* BibTeX syntax highlighting */
.bibtex-entry-type { color: #9d96ff; font-weight: 600; } /* @inproceedings - lighter purple */
.bibtex-key { color: #c4bfff; font-weight: 500; } /* grillotti2025ursa - even lighter purple */
.bibtex-field { color: #b8b5ff; } /* title, author, etc. - lighter accent variant */
.bibtex-value { color: #e8e8e8; } /* field values - light gray for readability */
.bibtex-bracket { color: #888; } /* { } - lighter than muted for better visibility */
.bibtex-equals { color: #888; } /* = */
.bibtex-comma { color: #888; } /* , */

/* ---------- Footer ---------- */
.site-footer{ border-top: 1px solid var(--rule); padding: 26px 0; margin-top: 36px; text-align:center; color: var(--muted); }

/* ---------- Responsive ---------- */

/* Small laptop/desktop windows (common during development) */
@media (max-width: 1200px) {
  .container {
    padding: 0 40px;
  }
  
  /* Add universal content margins */
  .video-wrap,
  .hero-figure,
  pre {
    margin-left: 8px;
    margin-right: 8px;
  }
  
  /* Fix section content (abstract, etc.) margins */
  .section p,
  .section h2 {
    margin-left: 8px;
    margin-right: 8px;
  }
}

/* Mobile navigation improvements */
@media (max-width: 768px) {
  .nav {
    position: relative;
    padding: 12px 0;
  }
  
  .brand {
    font-size: 1.1rem;
    z-index: 10;
  }
  
  /* Hamburger menu button */
  .nav-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background-color 0.2s ease;
  }
  
  .nav-toggle:hover {
    background: rgba(0, 0, 0, 0.05);
  }
  
  .nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--ink);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 1px;
    transform-origin: center;
  }
  
  /* Animate hamburger to X when open */
  .nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  /* Hide navigation by default on mobile */
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: saturate(180%) blur(12px);
    border: 1px solid var(--rule);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    padding: 16px;
    margin-top: 8px;
    z-index: 20;
  }
  
  /* Show navigation when toggled */
  .nav-links.nav-open {
    display: flex;
    flex-direction: column;
    gap: 8px;
    animation: slideDown 0.3s ease;
  }
  
  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  .nav-links a {
    margin: 0;
    padding: 12px 16px;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 8px;
    text-align: center;
    color: var(--ink);
    background: transparent;
    border: none;
    transition: all 0.2s ease;
    text-decoration: none;
  }
  
  .nav-links a:hover {
    background: var(--accent);
    color: white;
    transform: translateY(-1px);
  }
}

/* Fallback for browsers without backdrop-filter */
@supports not (backdrop-filter: blur(12px)) {
  @media (max-width: 768px) {
    .nav-links {
      background: rgba(255, 255, 255, 0.98);
    }
  }
}

/* Alternative: Keep simple inline layout for medium mobile screens */
@media (min-width: 480px) and (max-width: 768px) {
  .nav {
    flex-wrap: wrap;
    gap: 12px;
    padding: 8px 0;
  }
  
  .nav-toggle {
    display: none;
  }
  
  .nav-links {
    display: flex !important;
    position: static;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    width: 100%;
    margin-top: 8px;
    padding: 0;
    background: none;
    border: none;
    box-shadow: none;
    animation: none;
  }
  
  .nav-links a {
    margin: 0;
    padding: 8px 14px;
    font-size: 0.9rem;
    border-radius: 20px;
    background: rgba(90, 77, 245, 0.08);
    border: 1px solid rgba(90, 77, 245, 0.15);
    color: var(--accent);
    font-weight: 500;
    transition: all 0.2s ease;
    flex: 0 1 auto;
  }
  
  .nav-links a:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    transform: translateY(-1px);
  }
}

/* Small mobile screens */
@media (max-width: 640px) {
  .container {
    padding: 0 20px;
  }
  
  .hero {
    padding: 32px 0 20px;
  }
  
  /* Venue badge mobile spacing */
  .venue-wrap {
    margin-bottom: 12px;
  }
  
  h1 {
    font-size: clamp(1.6rem, 6vw, 2rem);
    margin-bottom: 0.75rem;
  }
  
  h2 {
    font-size: clamp(1.1rem, 4vw, 1.3rem);
  }
  
  /* Override navigation for small mobile screens */
  .nav-toggle {
    display: block;
  }
  
  .nav-links {
    display: none !important;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: saturate(180%) blur(12px);
    border: 1px solid var(--rule);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    padding: 16px;
    margin-top: 8px;
    z-index: 20;
  }
  
  .nav-links.nav-open {
    display: flex !important;
    flex-direction: column;
    gap: 8px;
    animation: slideDown 0.3s ease;
  }
  
  .nav-links a {
    margin: 0;
    padding: 12px 16px;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 8px;
    text-align: center;
    color: var(--ink);
    background: transparent;
    border: none;
    transition: all 0.2s ease;
    text-decoration: none;
  }
  
  .nav-links a:hover {
    background: var(--accent);
    color: white;
    transform: translateY(-1px);
  }
  
  /* CTA buttons mobile layout */
  .cta {
    gap: 10px;
    margin-top: 24px;
    justify-content: center;
  }
  
  .btn {
    flex: 0 1 auto;
    min-width: 140px;
    max-width: 180px;
    justify-content: center;
    padding: 12px 16px;
    font-size: 0.9rem;
    white-space: nowrap;
  }
  
  /* Ensure buttons wrap nicely on very small screens */
  @media (max-width: 480px) {
    .btn {
      min-width: calc(50% - 5px);
      max-width: none;
      flex: 1 1 calc(50% - 5px);
    }
  }
  
  /* Authors and lab text */
  .authors {
    font-size: 1rem;
    line-height: 1.5;
    word-spacing: 0.1rem;
    margin-top: 12px;
  }
  
  .lab {
    font-size: 0.9rem;
    margin-top: 4px;
  }
  
  /* Venue badge mobile adjustments */
  .venue-badge {
    padding: 6px 12px;
    font-size: 0.9rem;
    gap: 8px;
  }
  
  /* Hero figure mobile */
  .hero-figure {
    margin: 16px 4px 8px; /* Add side margins */
    padding: 12px;
  }
  
  /* Section spacing */
  .section {
    padding: 28px 0;
  }
  
  /* Improve paragraph readability on mobile */
  .section p {
    font-size: 0.95rem;
    line-height: 1.6;
  }
}

/* ---------- Tablet ---------- */
@media (max-width: 1024px) and (min-width: 769px) {
  .video-grid {
    gap: 1.5rem;
  }
  
  .video-item h3 {
    font-size: 1.05rem;
  }
}

/* Continue mobile styles */
@media (max-width: 768px) {
  /* Video mobile */
  .video-wrap {
    border-radius: 10px;
    margin: 0 4px; /* Extra breathing room for video */
  }
  
  /* Hero video mobile fixes */
  .hero-figure video {
    max-width: 100%;
    height: auto !important;
    object-fit: contain;
  }
  
  .hero-video-wrap {
    width: 100%;
    max-width: 100%;
  }
  
  /* Video grid mobile */
  .video-grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    gap: 1.5rem;
    margin-top: 1rem;
  }
  
  .video-item h3 {
    font-size: 1rem;
  }
  
  /* BibTeX mobile */
  pre {
    padding: 12px 14px;
    font-size: 0.85rem;
    overflow-x: auto;
    margin: 0 4px; /* Extra breathing room */
  }
  
  /* Footer */
  .site-footer {
    padding: 20px 0;
    font-size: 0.9rem;
  }
}

/* Very small screens (older phones) */
@media (max-width: 400px) {
  .container {
    padding: 0 16px;
  }
  
  .hero {
    padding: 20px 0 16px;
  }
  
  /* Venue wrap for very small screens */
  .venue-wrap {
    margin-bottom: 10px;
  }
  
  h1 {
    font-size: clamp(1.4rem, 7vw, 1.8rem);
    line-height: 1.2;
  }
  
  .authors {
    font-size: 0.95rem;
  }
  
  .venue-badge {
    padding: 6px 12px;
    font-size: 0.85rem;
  }
  
  .btn {
    padding: 10px 8px;
    font-size: 0.85rem;
  }
  
  .hero-figure {
    padding: 8px;
    margin: 12px 2px 6px; /* Maintain margins on very small screens */
  }
  
  /* Very small mobile specific adjustments */
  .cta {
    gap: 8px;
  }
  
  pre {
    font-size: 0.8rem;
    padding: 10px 12px;
    margin: 0 2px; /* Maintain breathing room on very small screens */
  }
}

/* Medium laptop windows */
@media (min-width: 1025px) and (max-width: 1200px) {
  .container {
    padding: 0 48px;
  }
}

/* Tablet landscape and medium screens */
@media (min-width: 641px) and (max-width: 1024px) {
  .container {
    padding: 0 36px;
  }
  
  .hero {
    padding: 48px 0 24px;
  }
  
  .cta {
    gap: 12px;
  }
  
  .btn {
    padding: 11px 16px;
  }
}