/* ===================================================================
   Academic Portfolio Theme
   A clean, minimalist design for research-focused portfolios
   =================================================================== */

/* --- CSS Variables --- */
:root {
  /* Primary Colors */
  --primary-navy: #1a365d;
  --primary-slate: #334155;
  --primary-accent: #3b82f6;
  --accent-gold: #d97706;
  
  /* Background Colors */
  --bg-light: #fafafa;
  --bg-white: #ffffff;
  --bg-section: #f8fafc;
  --bg-card: #ffffff;
  
  /* Text Colors */
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  /* Border Colors */
  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  /* Typography */
  --font-serif: 'Playfair Display', 'Georgia', serif;
  --font-sans: 'Source Sans 3', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --section-padding: 80px 0;
  --container-max: 1100px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;500;600;700&family=Source+Sans+3:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Base Styles --- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body.academic-theme {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-light);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.3;
  color: var(--primary-navy);
  margin: 0 0 1rem;
}

h1 { font-size: 2.75rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin: 0 0 1rem;
  color: var(--text-secondary);
}

a {
  color: var(--primary-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* --- Layout --- */
.academic-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.academic-section {
  padding: var(--section-padding);
}

.academic-section.alt-bg {
  background-color: var(--bg-section);
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  position: relative;
  display: inline-block;
  margin-bottom: 0.5rem;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-accent), var(--accent-gold));
  border-radius: 2px;
}

.section-header p {
  max-width: 600px;
  margin: 1rem auto 0;
  color: var(--text-muted);
}

/* --- Sidebar Navigation --- */
.academic-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  height: 100vh;
  background: linear-gradient(180deg, var(--primary-navy) 0%, #0f172a 100%);
  padding: 30px 20px;
  overflow-y: auto;
  z-index: 1000;
  display: flex;
  flex-direction: column;
}

.academic-sidebar .profile {
  text-align: center;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 20px;
}

.academic-sidebar .profile img {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  border: 4px solid rgba(255,255,255,0.2);
  margin-bottom: 15px;
  object-fit: cover;
}

.academic-sidebar .profile h1 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: #fff;
  margin-bottom: 5px;
  font-weight: 500;
}

.academic-sidebar .profile .tagline {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  font-weight: 400;
}

/* Social Links */
.academic-sidebar .social-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 15px;
}

.academic-sidebar .social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.8);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.academic-sidebar .social-links a:hover {
  background: var(--primary-accent);
  color: #fff;
  transform: translateY(-2px);
}

/* Navigation */
.academic-nav {
  flex: 1;
  margin-top: 10px;
}

.academic-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.academic-nav li {
  margin-bottom: 4px;
}

.academic-nav a {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  color: rgba(255,255,255,0.75);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.academic-nav a i {
  margin-right: 12px;
  font-size: 1.1rem;
  width: 20px;
  text-align: center;
}

.academic-nav a:hover,
.academic-nav a.active {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.academic-nav a.active {
  background: var(--primary-accent);
}

/* --- Main Content Area --- */
.academic-main {
  margin-left: 280px;
  min-height: 100vh;
}

/* --- Hero Section --- */
.academic-hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-white) 0%, var(--bg-section) 100%);
  position: relative;
  overflow: hidden;
}

.academic-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(217, 119, 6, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  padding: 40px;
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-slate) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content .typed-container {
  font-size: 1.4rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  min-height: 2em;
}

.hero-content .typed-container .typed {
  color: var(--primary-accent);
  font-weight: 600;
}

.hero-affiliations {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.affiliation-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: 50px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

.affiliation-badge i {
  color: var(--primary-accent);
}

/* --- About Section --- */
.about-content {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 50px;
  align-items: start;
}

.about-image {
  position: sticky;
  top: 100px;
}

.about-image img {
  width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
}

.about-text h3 {
  color: var(--primary-accent);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
}

.about-text .lead {
  font-size: 1.2rem;
  color: var(--text-primary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.about-details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
}

.about-detail-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.about-detail-item i {
  color: var(--primary-accent);
  font-size: 1.1rem;
  width: 20px;
}

.about-detail-item strong {
  color: var(--text-primary);
  margin-right: 5px;
}

/* --- Publications Section --- */
.publication-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.publication-item {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 28px;
  transition: all var(--transition-base);
  position: relative;
}

.publication-item:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary-accent);
}

.publication-item.featured {
  border-left: 4px solid var(--accent-gold);
}

.publication-badge {
  position: absolute;
  top: -10px;
  right: 20px;
  background: linear-gradient(135deg, var(--accent-gold), #f59e0b);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.publication-title {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary-navy);
  margin-bottom: 10px;
  line-height: 1.4;
}

.publication-title a {
  color: inherit;
}

.publication-title a:hover {
  color: var(--primary-accent);
}

.publication-authors {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.publication-authors .highlight {
  font-weight: 600;
  color: var(--primary-accent);
}

.publication-venue {
  display: flex;
  align-items: center;
  gap: 15px;
  flex-wrap: wrap;
  font-size: 0.9rem;
}

.publication-venue .venue-name {
  font-style: italic;
  color: var(--text-muted);
}

.publication-venue .impact-factor {
  background: var(--bg-section);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary-accent);
}

.publication-venue .year {
  color: var(--text-muted);
  font-weight: 500;
}

.publication-links {
  margin-top: 15px;
  display: flex;
  gap: 10px;
}

.publication-links a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.publication-links .btn-pdf {
  background: var(--primary-accent);
  color: #fff;
}

.publication-links .btn-pdf:hover {
  background: var(--primary-navy);
}

.publication-links .btn-cite {
  background: var(--bg-section);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
}

.publication-links .btn-cite:hover {
  border-color: var(--primary-accent);
  color: var(--primary-accent);
}

/* --- Research Projects Section --- */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.research-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  overflow: hidden;
  transition: all var(--transition-base);
}

.research-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.research-card-image {
  height: 180px;
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-slate) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.research-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.research-card-image .placeholder-icon {
  font-size: 3rem;
  color: rgba(255,255,255,0.3);
}

.research-card-content {
  padding: 24px;
}

.research-card-content h4 {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--primary-navy);
}

.research-card-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 15px;
  line-height: 1.6;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 15px;
}

.research-tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 10px;
  background: var(--bg-section);
  color: var(--text-muted);
  border-radius: 4px;
}

.research-card-links {
  display: flex;
  gap: 10px;
}

.research-card-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--primary-accent);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.research-card-links a:hover {
  color: var(--primary-navy);
}

/* --- Research Interests Section --- */
.interests-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.interest-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 30px 24px;
  text-align: center;
  transition: all var(--transition-base);
}

.interest-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary-accent);
}

.interest-card .icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 15px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(217, 119, 6, 0.1));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-accent);
}

.interest-card h4 {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--primary-navy);
}

.interest-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
}

/* --- Experience Timeline --- */
.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-light);
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 5px;
  width: 10px;
  height: 10px;
  background: var(--primary-accent);
  border-radius: 50%;
  border: 3px solid var(--bg-light);
}

.timeline-item.research::before {
  background: var(--accent-gold);
}

.timeline-date {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-accent);
  margin-bottom: 5px;
}

.timeline-item.research .timeline-date {
  color: var(--accent-gold);
}

.timeline-title {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary-navy);
  margin-bottom: 5px;
}

.timeline-company {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.timeline-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.timeline-description ul {
  margin: 10px 0 0;
  padding-left: 20px;
}

.timeline-description li {
  margin-bottom: 5px;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.timeline-tag {
  font-size: 0.75rem;
  padding: 3px 10px;
  background: var(--bg-section);
  color: var(--text-muted);
  border-radius: 4px;
}

/* --- Applied ML / Freelance Section --- */
.applied-ml-intro {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem;
}

.applied-ml-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 3rem;
}

.stat-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 24px;
  text-align: center;
}

.stat-card .number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-accent);
  line-height: 1;
}

.stat-card .label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 24px;
}

.testimonial-card blockquote {
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0 0 15px;
  position: relative;
  padding-left: 20px;
}

.testimonial-card blockquote::before {
  content: '"';
  position: absolute;
  left: 0;
  top: -5px;
  font-size: 2rem;
  color: var(--primary-accent);
  font-family: var(--font-serif);
  line-height: 1;
}

.testimonial-card .client-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.testimonial-card .client-info img {
  width: 24px;
  height: auto;
}

.testimonial-card .client-info span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 50px;
}

.contact-info {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 30px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 25px;
}

.contact-item:last-child {
  margin-bottom: 0;
}

.contact-item .icon {
  width: 45px;
  height: 45px;
  background: var(--bg-section);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--primary-accent);
  flex-shrink: 0;
}

.contact-item h4 {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 3px;
}

.contact-item p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: 0;
}

.contact-form {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 30px;
}

.contact-form .form-group {
  margin-bottom: 20px;
}

.contact-form label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  transition: border-color var(--transition-fast);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary-accent);
}

.contact-form textarea {
  min-height: 150px;
  resize: vertical;
}

.contact-form .form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.contact-form button {
  padding: 14px 32px;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  background: var(--primary-accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.contact-form button:hover {
  background: var(--primary-navy);
}

/* --- Footer --- */
.academic-footer {
  background: var(--primary-navy);
  color: rgba(255,255,255,0.7);
  padding: 30px 0;
  text-align: center;
}

.academic-footer p {
  margin: 0;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
}

.academic-footer a {
  color: rgba(255,255,255,0.9);
}

/* --- Responsive Design --- */
@media (max-width: 1200px) {
  .interests-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 992px) {
  .academic-sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }
  
  .academic-sidebar.show {
    transform: translateX(0);
  }
  
  .academic-main {
    margin-left: 0;
  }
  
  .mobile-nav-toggle {
    display: flex !important;
    position: fixed;
    top: 20px;
    left: 20px;
    width: 44px;
    height: 44px;
    background: var(--primary-navy);
    color: #fff;
    border-radius: 8px;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    z-index: 1001;
    cursor: pointer;
  }
  
  .about-content {
    grid-template-columns: 1fr;
  }
  
  .about-image {
    position: static;
    max-width: 300px;
    margin: 0 auto 30px;
  }
  
  .research-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .applied-ml-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-content h1 {
    font-size: 2.5rem;
  }
  
  .hero-content .typed-container {
    font-size: 1.1rem;
  }
  
  .interests-grid {
    grid-template-columns: 1fr;
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-form .form-row {
    grid-template-columns: 1fr;
  }
  
  .about-details {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .academic-section {
    padding: 50px 0;
  }
  
  .hero-content h1 {
    font-size: 2rem;
  }
  
  .applied-ml-stats {
    grid-template-columns: 1fr 1fr;
    gap: 15px;
  }
  
  .stat-card .number {
    font-size: 2rem;
  }
  
  .hero-affiliations {
    flex-direction: column;
    align-items: center;
  }
}

/* --- Utility Classes --- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }