/* VGS Research Hub - Universal Theme */
/* Navy (#001f3f) + Gold (#FFD700) - Professional Academic Styling */

/* ===== COLOR VARIABLES ===== */
:root {
  --vgs-navy: #001f3f;
  --vgs-navy-light: #003d7a;  /* Lighter for backgrounds */
  --vgs-navy-dark: #001529;
  --vgs-gold: #FFD700;
  --vgs-gold-dark: #DAA520;
  --vgs-blue-light: #4a90d9;
  --vgs-gray: #f6f8fa;
  --vgs-text: #24292f;
  --vgs-text-light: #57606a;
  --vgs-border: #d0d7de;
  --vgs-success: #1a7f37;
  --vgs-warning: #9a6700;
  --vgs-danger: #cf222e;
  --vgs-white: #ffffff;
}

/* ===== BASE TYPOGRAPHY ===== */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--vgs-text);
  background: var(--vgs-white);
  margin: 0;
  padding: 20px;
  max-width: 100%;
  overflow-x: hidden;
}

/* MAIN CONTENT CONTAINER - FIX WIDTH ISSUE */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--vgs-navy);
  font-weight: 600;
  line-height: 1.25;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

h1 { 
  font-size: 2.5rem;
  border-bottom: 3px solid var(--vgs-gold);
  padding-bottom: 0.5rem;
}

h2 { 
  font-size: 2rem;
  border-left: 4px solid var(--vgs-gold);
  padding-left: 1rem;
}

h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

/* ===== LINKS ===== */
a {
  color: var(--vgs-navy);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--vgs-gold-dark);
  text-decoration: underline;
}

/* ===== CODE BLOCKS ===== */
code {
  background: var(--vgs-gray);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
  font-size: 0.9em;
  color: var(--vgs-danger);
}

pre {
  background: var(--vgs-navy-dark);
  color: var(--vgs-white);
  padding: 1.5rem;
  border-radius: 6px;
  overflow-x: auto;
  border-left: 4px solid var(--vgs-gold);
  margin: 1.5rem 0;
}

pre code {
  background: none;
  padding: 0;
  color: var(--vgs-white);
}

/* ===== TABLES ===== */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 2rem 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

th, td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid var(--vgs-border);
}

th {
  background: var(--vgs-navy);
  color: var(--vgs-white);
  font-weight: 600;
}

tr:hover {
  background: var(--vgs-gray);
}

/* ===== HERO SECTION - LIGHTENED FOR VISIBILITY ===== */
.hero {
  background: linear-gradient(135deg, var(--vgs-navy-light) 0%, var(--vgs-blue-light) 100%);
  color: var(--vgs-white);
  padding: 4rem 2rem;
  text-align: center;
  border-bottom: 5px solid var(--vgs-gold);
  border-radius: 8px;
  margin: -20px -20px 2rem -20px;
  max-width: none;
}

.hero h1 {
  color: var(--vgs-gold) !important;
  margin: 0 0 1rem 0;
  font-size: 3rem;
  border: none;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero .subtitle {
  font-size: 1.3rem;
  margin: 0 0 2rem 0;
  opacity: 0.95;
  color: var(--vgs-white);
}

/* HERO STATS - IMPROVED VISIBILITY */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
  margin-top: 2rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats .stat {
  text-align: center;
  background: rgba(255, 255, 255, 0.15);
  padding: 1.5rem 2rem;
  border-radius: 8px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  min-width: 150px;
}

.hero-stats h3 {
  margin: 0;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--vgs-gold);
  text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

.hero-stats p {
  margin: 0.5rem 0 0 0;
  font-size: 1rem;
  opacity: 0.95;
  color: var(--vgs-white);
  font-weight: 500;
}

/* ALTERNATE HERO FOR PAPER PAGES */
.hero-section {
  background: linear-gradient(135deg, var(--vgs-navy-light) 0%, var(--vgs-blue-light) 100%);
  color: var(--vgs-white);
  padding: 3rem 2rem;
  border-radius: 8px;
  margin-bottom: 2rem;
  border-left: 5px solid var(--vgs-gold);
}

.hero-section h1 {
  color: var(--vgs-gold) !important;
  margin-top: 0;
  border: none;
}

/* ===== DOCUMENT GRID - WIDTH CONSTRAINT ===== */
.doc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
  max-width: 1200px;
}

.doc-card {
  background: var(--vgs-white);
  padding: 2rem;
  border-radius: 8px;
  border: 2px solid var(--vgs-navy);
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.doc-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 12px rgba(0,0,0,0.15);
  border-color: var(--vgs-gold);
}

.doc-card h3 {
  color: var(--vgs-navy);
  margin-top: 0;
  font-size: 1.4rem;
}

.doc-card p {
  color: var(--vgs-text-light);
  margin: 1rem 0;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  background: var(--vgs-navy);
  color: var(--vgs-white) !important;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s ease;
  border: 2px solid var(--vgs-navy);
}

.btn:hover {
  background: var(--vgs-gold);
  color: var(--vgs-navy) !important;
  border-color: var(--vgs-gold);
  text-decoration: none;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

/* ===== CITATION BOX ===== */
.citation-box {
  background: var(--vgs-gray);
  padding: 15px;
  border-radius: 5px;
  position: relative;
  margin: 20px 0;
  font-family: "SF Mono", Monaco, monospace;
  font-size: 0.9em;
  border-left: 4px solid var(--vgs-navy);
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 5px 10px;
  background: var(--vgs-navy);
  color: var(--vgs-white);
  border: none;
  border-radius: 3px;
  cursor: pointer;
  font-size: 0.85em;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  background: var(--vgs-gold);
  color: var(--vgs-navy);
}

.copy-btn:active {
  transform: scale(0.95);
}

/* ===== MERMAID DIAGRAMS ===== */
.mermaid {
  display: flex;
  justify-content: center;
  margin: 2rem 0;
  background-color: var(--vgs-gray);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--vgs-border);
  max-width: 100%;
  overflow-x: auto;
}

.mermaid svg {
  max-width: 100%;
  height: auto;
}

/* ===== ACADEMIC CITATION SECTION ===== */
.academic-citation {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 2px solid var(--vgs-navy);
}

.academic-citation h3 {
  color: var(--vgs-navy);
}

.doi-link {
  margin: 1rem 0;
  font-size: 1.1rem;
}

.doi-link strong {
  color: var(--vgs-navy);
}

.additional-links {
  margin-top: 1.5rem;
}

.additional-links a {
  margin-right: 1rem;
  font-weight: 600;
}

/* ===== QUICK LINKS SECTION ===== */
.quick-links {
  background: var(--vgs-gray);
  padding: 2rem;
  border-radius: 8px;
  margin: 3rem 0;
  border: 1px solid var(--vgs-border);
}

.quick-links h2 {
  color: var(--vgs-navy);
  text-align: center;
  border: none;
  padding: 0;
}

/* ===== RESEARCH AREAS ===== */
.research-areas {
  margin: 3rem 0;
}

.research-areas > div {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  max-width: 1200px;
}

.research-areas > div > div {
  background: var(--vgs-white);
  padding: 1.5rem;
  border-left: 4px solid var(--vgs-navy);
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* ===== PUBLICATION STATS ===== */
.pub-stats {
  background: linear-gradient(135deg, var(--vgs-navy) 0%, var(--vgs-navy-light) 100%);
  color: var(--vgs-white);
  padding: 2rem;
  border-radius: 8px;
  text-align: center;
  margin: 3rem 0;
}

.pub-stats h2 {
  margin-top: 0;
  color: var(--vgs-white);
  border: none;
  padding: 0;
}

.pub-stats > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  margin-top: 1.5rem;
}

.pub-stats strong {
  font-size: 1.8rem;
  display: block;
  color: var(--vgs-gold);
  margin-bottom: 0.25rem;
}

/* ===== FOOTER CTA ===== */
.footer-cta {
  background: linear-gradient(135deg, var(--vgs-navy-dark) 0%, var(--vgs-navy) 100%);
  color: var(--vgs-white);
  padding: 2rem;
  border-radius: 8px;
  text-align: center;
  margin: 3rem 0;
}

.footer-cta p {
  margin: 0.5rem 0;
}

.footer-cta .copyright {
  margin-top: 1rem;
  opacity: 0.8;
  font-size: 0.9rem;
}

/* ===== VGS STANDARD CLASS ===== */
.vgs-standard {
  background: var(--vgs-white);
  color: var(--vgs-text);
  max-width: 100%;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  .main-content {
    padding: 0 1rem;
  }
  
  .hero {
    padding: 3rem 1.5rem;
    margin: -10px -10px 1.5rem -10px;
  }

  .hero h1 {
    font-size: 2rem;
  }
  
  .hero .subtitle {
    font-size: 1.1rem;
  }
  
  .hero-stats {
    gap: 1.5rem;
  }
  
  .hero-stats .stat {
    min-width: 120px;
    padding: 1rem 1.5rem;
  }
  
  .hero-stats h3 {
    font-size: 2rem;
  }
  
  .doc-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.2rem; }
}

@media (max-width: 480px) {
  .hero {
    padding: 2rem 1rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-stats {
    flex-direction: column;
    gap: 1rem;
  }

  .hero-stats .stat {
    width: 100%;
  }
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-navy { color: var(--vgs-navy); }
.text-gold { color: var(--vgs-gold); }
.bg-navy { background: var(--vgs-navy); }
.bg-gold { background: var(--vgs-gold); }
.border-navy { border-color: var(--vgs-navy); }
.border-gold { border-color: var(--vgs-gold); }