/* Modern Professional Academic Website Styles */

/* Import Inter font for clean, professional typography */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Modern color palette - professional academic colors */
  --color-primary: #2563eb;      /* Blue-600 */
  --color-primary-dark: #1d4ed8; /* Blue-700 */
  --color-secondary: #64748b;    /* Slate-500 */
  --color-accent: #0ea5e9;       /* Sky-500 */
  --color-text-primary: #0f172a; /* Slate-900 */
  --color-text-secondary: #475569; /* Slate-600 */
  --color-text-muted: #94a3b8;   /* Slate-400 */
  --color-background: #ffffff;
  --color-background-alt: #f8fafc; /* Slate-50 */
  --color-border: #e2e8f0;       /* Slate-200 */
  --color-shadow: rgba(15, 23, 42, 0.1);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 var(--color-shadow);
  --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -2px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 20px 25px -5px var(--color-shadow), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
}

/* Base typography */
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin: 0;
}

h1 { font-size: 3rem; font-weight: 700; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

/* Links */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary-dark);
}

/* Header styles */
.modern-header {
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-background-alt) 100%);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-2xl) 0;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-2xl);
  align-items: center;
}

.header-info h1 {
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.header-subtitle {
  color: var(--color-text-secondary);
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: var(--space-lg);
}

.profile-section {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.profile-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

.social-links {
  display: flex;
  gap: var(--space-md);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.social-link:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.social-link img {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
}

.social-link:hover img {
  filter: brightness(0) invert(1);
}

/* Navigation */
.modern-nav {
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav-content {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 64px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
}

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.1);
}

/* Main content */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

/* Section styles */
.section {
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xl);
  text-align: center;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: var(--space-2xl);
}

/* Card styles */
.card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-grid {
  display: grid;
  gap: var(--space-xl);
}

.card-grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

.card-grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* Hero section */
.hero-section {
  background: linear-gradient(135deg, var(--color-background-alt) 0%, var(--color-background) 100%);
  padding: var(--space-3xl) 0;
  margin: 0 0 var(--space-3xl) 0;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  text-align: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-lg);
}

.hero-description {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Publication styles */
.publication-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  background: var(--color-background);
  transition: all 0.2s ease;
}

.publication-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.publication-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.publication-authors {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  font-size: 0.95rem;
}

.publication-venue {
  display: inline-block;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  margin-right: var(--space-sm);
}

.publication-year {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-right: var(--space-sm);
}

.publication-award {
  display: inline-block;
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  margin-left: var(--space-sm);
}

.publication-links {
  margin-top: var(--space-md);
  display: flex;
  gap: var(--space-sm);
}

.publication-link {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: var(--color-background-alt);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.publication-link:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Filter styles */
.filter-container {
  background: var(--color-background-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.filter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.filter-label {
  font-weight: 500;
  color: var(--color-text-primary);
}

/* Button styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--color-background);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-background-alt);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Footer */
.modern-footer {
  background: var(--color-background-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Responsive design */
@media (max-width: 768px) {
  :root {
    --space-lg: 1rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
    --space-3xl: 2.5rem;
  }
  
  .header-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-xl);
  }
  
  .profile-section {
    flex-direction: column;
    gap: var(--space-lg);
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
  }
  
  .card-grid-2,
  .card-grid-3 {
    grid-template-columns: 1fr;
  }
  
  .filter-grid {
    grid-template-columns: 1fr;
  }
  
  .publication-links {
    flex-wrap: wrap;
  }
}

/* Custom styles for existing elements */
.blue-sec {
  background: transparent;
}

/* Legacy compatibility */
.bg-faded {
  background: var(--color-background-alt);
  border: 1px solid var(--color-border);
}

.text-faded {
  color: var(--color-text-secondary);
}

/* Hide old styles */
.site-heading {
  display: none !important;
}

.heading-container {
  display: none !important;
}

.navbar {
  display: none !important;
}

/* Image slider modern styles */
.image-slider-container {
  background: var(--color-background);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--space-2xl);
}

.slide-content {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: white;
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.slide-content:hover {
  transform: scale(1.02);
}

.slide-title {
  font-size: 2rem;
  font-weight: 700;
  margin: 0;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Navigation dots */
.slider-navigation {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-lg);
  gap: var(--space-md);
}

.slider-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border);
  cursor: pointer;
  transition: all 0.2s ease;
}

.slider-dot.active {
  background: var(--color-primary);
  transform: scale(1.2);
}