/* ======= CSS Variables ======= */
:root {
  /* Colors */
  --primary-color: #1e40af;
  --secondary-color: #0ea5e9;
  --accent-color: #f59e0b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  
  /* Neutral Colors */
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Playfair Display', Georgia, serif;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Borders */
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ======= Reset & Base Styles ======= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--secondary-color);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul {
  list-style: none;
}

/* ======= Container ======= */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ======= Typography ======= */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

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;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--gray-600);
}

.lead {
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--gray-700);
}

/* ======= Buttons ======= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: #1d4ed8;
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: var(--white);
  transform: translateY(-2px);
}

/* ======= Navigation ======= */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
  z-index: 1000;
  transition: all var(--transition-fast);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.nav-brand a {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--gray-900);
  font-weight: 600;
}

.brand-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-md);
  font-weight: 700;
  font-size: 1rem;
}

.brand-text {
  font-size: 1.25rem;
  color: var(--gray-900);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--gray-700);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-xl);
}

.nav-link {
  padding: var(--spacing-sm) var(--spacing-md);
  font-weight: 500;
  color: var(--gray-700);
  border-radius: var(--border-radius-sm);
  position: relative;
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background-color: var(--primary-color);
  border-radius: 2px;
  transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 80%;
}

/* ======= Sections ======= */
.section {
  padding: var(--spacing-3xl) 0;
}

.section:nth-child(even) {
  background-color: var(--gray-50);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}

/* ======= Page Header ======= */
.page-header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  padding: 8rem 0 4rem;
  text-align: center;
  margin-top: 80px;
}

.page-title {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--white);
}

.page-subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin: 0 auto;
}

/* ======= Hero Section ======= */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  text-align: center;
  position: relative;
  padding: var(--spacing-3xl) var(--spacing-lg);
  padding-top: 120px; /* Account for fixed navbar */
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  max-width: 1200px;
  width: 100%;
}

.hero-text {
  text-align: left;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.title-line {
  display: block;
}

.highlight {
  background: linear-gradient(135deg, var(--accent-color), #fbbf24);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-xl);
  width: 100%;
  max-width: 400px;
}

.card-header {
  display: flex;
  justify-content: flex-start;
  margin-bottom: var(--spacing-lg);
}

.card-dots {
  display: flex;
  gap: var(--spacing-sm);
}

.card-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.3);
}

.card-dots span:first-child {
  background-color: #ef4444;
}

.card-dots span:nth-child(2) {
  background-color: #f59e0b;
}

.card-dots span:last-child {
  background-color: #10b981;
}

.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.2;
}

.hero-scroll {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
}

.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
}

.scroll-line {
  width: 2px;
  height: 30px;
  background: linear-gradient(to bottom, var(--white), transparent);
  animation: scroll-pulse 2s infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ======= Research Highlights ======= */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.research-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
}

.research-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.card-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
}

.card-icon svg {
  width: 28px;
  height: 28px;
  stroke-width: 2;
}

.research-card h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

.research-card p {
  color: var(--gray-600);
  line-height: 1.6;
}

/* ======= Work Grid ======= */
.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
}

.work-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
}

.work-card.featured {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  transform: scale(1.05);
}

.work-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.work-card.featured:hover {
  transform: scale(1.05) translateY(-8px);
}

.work-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.work-tag {
  background-color: var(--accent-color);
  color: var(--white);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

.work-card.featured .work-tag {
  background-color: rgba(255, 255, 255, 0.2);
}

.work-date {
  color: var(--gray-500);
  font-size: 0.875rem;
}

.work-card.featured .work-date {
  color: rgba(255, 255, 255, 0.8);
}

.work-card h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

.work-card.featured h3 {
  color: var(--white);
}

.work-card p {
  color: var(--gray-600);
  margin-bottom: var(--spacing-lg);
}

.work-card.featured p {
  color: rgba(255, 255, 255, 0.9);
}

.work-link {
  color: var(--primary-color);
  font-weight: 500;
  text-decoration: none;
}

.work-card.featured .work-link {
  color: var(--white);
}

/* ======= CTA Section ======= */
.cta-section {
  background: var(--gray-900);
  color: var(--white);
  text-align: center;
}

.cta-content h2 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
}

.cta-content p {
  color: var(--gray-300);
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-actions {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

/* ======= Footer ======= */
.footer {
  background-color: var(--gray-900);
  color: var(--white);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand h3 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
}

.footer-brand p {
  color: var(--gray-400);
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.footer-column h4 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

.footer-column a {
  display: block;
  color: var(--gray-400);
  margin-bottom: var(--spacing-sm);
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid var(--gray-800);
  padding-top: var(--spacing-xl);
  text-align: center;
}

.footer-bottom p {
  color: var(--gray-500);
  margin: 0;
}

/* ======= Tab Navigation ======= */
.nav-tabs {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-3xl);
  border-bottom: 1px solid var(--gray-200);
}

.tab-button {
  background: none;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 500;
  color: var(--gray-600);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.tab-button:hover,
.tab-button.active {
  color: var(--primary-color);
}

.tab-button::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--primary-color);
  border-radius: 2px 2px 0 0;
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}

.tab-button.active::after {
  transform: scaleX(1);
}

/* ======= Tags ======= */
.tag {
  display: inline-block;
  background-color: var(--gray-100);
  color: var(--gray-700);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  margin: var(--spacing-xs);
}

/* ======= Responsive Design ======= */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    text-align: center;
  }
  
  .hero-text {
    text-align: center;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-description {
    font-size: 1.125rem;
  }
  
  .hero-card {
    max-width: 500px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    border-top: 1px solid var(--gray-200);
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .hero {
    padding: var(--spacing-2xl) var(--spacing-md);
    padding-top: 100px;
    min-height: calc(100vh - 80px);
  }
  
  .hero-title {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
  }
  
  .hero-description {
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
  }
  
  .hero-actions {
    gap: var(--spacing-md);
    justify-content: center;
  }
  
  .hero-card {
    padding: var(--spacing-lg);
    max-width: 100%;
  }
  
  .stat-grid {
    gap: var(--spacing-md);
  }
  
  .stat-number {
    font-size: 1.75rem;
  }
  
  .stat-label {
    font-size: 0.75rem;
  }
  
  .hero-scroll {
    display: none;
  }
  
  .page-title {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .cta-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .nav-tabs {
    flex-wrap: wrap;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
  }
  
  .research-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .work-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .research-card,
  .work-card {
    padding: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .hero {
    padding: var(--spacing-lg) var(--spacing-sm);
    padding-top: 90px;
    min-height: calc(100vh - 70px);
  }
  
  .hero-title {
    font-size: 2rem;
    line-height: 1.1;
  }
  
  .hero-description {
    font-size: 0.95rem;
    line-height: 1.5;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: var(--spacing-sm);
  }
  
  .btn {
    width: 100%;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .hero-card {
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
  }
  
  .stat-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
  }
  
  .stat-number {
    font-size: 1.5rem;
  }
  
  .stat-label {
    font-size: 0.7rem;
    line-height: 1.1;
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  .section-header {
    margin-bottom: var(--spacing-2xl);
  }
  
  .section-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
  }
  
  .section-subtitle {
    font-size: 1rem;
  }
  
  .research-card,
  .work-card {
    padding: var(--spacing-md);
  }
  
  .card-icon {
    width: 50px;
    height: 50px;
    margin-bottom: var(--spacing-md);
  }
  
  .card-icon svg {
    width: 24px;
    height: 24px;
  }
  
  .research-card h3,
  .work-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
  }
  
  .work-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
  }
  
  .nav-container {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .brand-text {
    font-size: 1.125rem;
  }
  
  .brand-logo {
    width: 35px;
    height: 35px;
    font-size: 0.875rem;
  }
  
  .page-title {
    font-size: 2rem;
  }
  
  .cta-actions {
    flex-direction: column;
    width: 100%;
    gap: var(--spacing-sm);
  }
}

/* ======= About Page Styles ======= */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

.about-text h2 {
  margin-bottom: var(--spacing-lg);
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.highlight-card {
  background: var(--white);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  border-left: 4px solid var(--primary-color);
}

.highlight-card h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.expertise-item {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.expertise-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.expertise-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  margin-bottom: var(--spacing-lg);
}

.expertise-icon svg {
  width: 24px;
  height: 24px;
  stroke-width: 2;
}

.expertise-item h3 {
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

.expertise-item ul {
  list-style: none;
}

.expertise-item li {
  color: var(--gray-600);
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-lg);
  position: relative;
}

.expertise-item li::before {
  content: '•';
  color: var(--primary-color);
  position: absolute;
  left: 0;
  font-weight: bold;
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 100%;
  background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-3xl);
  display: flex;
  align-items: center;
}

.timeline-item:nth-child(odd) {
  flex-direction: row;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-marker {
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  border: 4px solid var(--white);
  border-radius: 50%;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  box-shadow: var(--shadow-md);
}

.timeline-content {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  width: calc(50% - 30px);
  position: relative;
}

.timeline-item:nth-child(odd) .timeline-content {
  margin-right: auto;
}

.timeline-item:nth-child(even) .timeline-content {
  margin-left: auto;
}

.timeline-content h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.timeline-date {
  color: var(--gray-500);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  display: block;
}

.timeline-content p {
  color: var(--gray-600);
  margin: 0;
}

/* ======= Research Page Styles ======= */
.patents-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

.patent-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
}

.patent-card.featured {
  border-left: 6px solid var(--primary-color);
  transform: scale(1.02);
}

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

.patent-card.featured:hover {
  transform: scale(1.02) translateY(-4px);
}

.patent-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.patent-type {
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--white);
}

.patent-type.utility {
  background-color: var(--primary-color);
}

.patent-type.design {
  background-color: var(--secondary-color);
}

.patent-status {
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  background-color: var(--success-color);
  color: var(--white);
}

.patent-status.pending {
  background-color: var(--warning-color);
}

.patent-card h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-lg);
  font-size: 1.5rem;
}

.patent-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.detail-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.detail-item .label {
  font-weight: 500;
  color: var(--gray-500);
  font-size: 0.875rem;
}

.detail-item .value {
  color: var(--gray-800);
  font-weight: 600;
}

.patent-description {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.patent-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.papers-list {
  max-width: 900px;
  margin: 0 auto;
}

.paper-item {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
}

.paper-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.paper-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.paper-year {
  background-color: var(--primary-color);
  color: var(--white);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

.paper-journal {
  color: var(--gray-500);
  font-size: 0.875rem;
  font-style: italic;
}

.paper-item h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
  font-size: 1.25rem;
  line-height: 1.4;
}

.paper-authors {
  color: var(--gray-600);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-md);
  line-height: 1.5;
}

.paper-authors strong {
  color: var(--primary-color);
}

.paper-abstract {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.paper-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.load-more-container {
  text-align: center;
  margin-top: var(--spacing-2xl);
}

.load-more-btn {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.impact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.impact-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: all var(--transition-normal);
}

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

.impact-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
  font-family: var(--font-heading);
}

.impact-label {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.impact-description {
  color: var(--gray-600);
  font-size: 0.95rem;
}

/* ======= Publications Page Styles ======= */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.book-card {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
}

.book-card.featured {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

.book-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.book-card.featured:hover {
  transform: scale(1.05) translateY(-8px);
}

.book-image {
  position: relative;
  height: 250px;
  overflow: hidden;
}

.book-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.book-card:hover .book-image img {
  transform: scale(1.1);
}

.book-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.book-card:hover .book-overlay {
  opacity: 1;
}

.book-info {
  padding: var(--spacing-xl);
}

.book-info h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
  font-size: 1.5rem;
}

.book-subtitle {
  color: var(--gray-500);
  font-size: 1rem;
  margin-bottom: var(--spacing-lg);
  font-style: italic;
}

.book-details {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.book-type {
  background-color: var(--secondary-color);
  color: var(--white);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

.book-year {
  color: var(--gray-500);
  font-size: 0.875rem;
  font-weight: 500;
}

.book-description {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.book-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.copyrights-list {
  max-width: 1000px;
  margin: 0 auto;
}

.copyright-item {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
  border-left: 6px solid var(--primary-color);
}

.copyright-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.copyright-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.copyright-number {
  background-color: var(--accent-color);
  color: var(--white);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: monospace;
}

.copyright-year {
  color: var(--gray-500);
  font-size: 0.875rem;
  font-weight: 500;
}

.copyright-item h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
  font-size: 1.25rem;
  line-height: 1.4;
}

.copyright-description {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.copyright-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.stat-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: all var(--transition-normal);
}

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

.stat-card .stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
  font-family: var(--font-heading);
}

.stat-card .stat-label {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.stat-card .stat-description {
  color: var(--gray-600);
  font-size: 0.95rem;
}

/* ======= Achievements Page Styles ======= */
.conferences-list {
  max-width: 1000px;
  margin: 0 auto;
}

.conference-item {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
}

.conference-item.featured {
  border-left: 6px solid var(--primary-color);
  transform: scale(1.02);
}

.conference-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.conference-item.featured:hover {
  transform: scale(1.02) translateY(-4px);
}

.conference-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.conference-type {
  background-color: var(--secondary-color);
  color: var(--white);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

.conference-year {
  color: var(--gray-500);
  font-size: 0.875rem;
  font-weight: 500;
}

.conference-item h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
  font-size: 1.5rem;
  line-height: 1.4;
}

.conference-details {
  margin-bottom: var(--spacing-lg);
}

.conference-name {
  color: var(--primary-color);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
}

.conference-role {
  color: var(--gray-500);
  font-size: 0.875rem;
  font-style: italic;
}

.conference-description {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.conference-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.achievement-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
}

.achievement-card.highlight {
  border-left: 6px solid var(--accent-color);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.05), rgba(16, 185, 129, 0.05));
}

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

.achievement-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  margin-bottom: var(--spacing-lg);
}

.achievement-icon svg {
  width: 28px;
  height: 28px;
  stroke-width: 2;
}

.achievement-card h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
  font-size: 1.5rem;
}

.achievement-stats {
  margin-bottom: var(--spacing-lg);
}

.achievement-stats .stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
  font-family: var(--font-heading);
  display: block;
}

.achievement-stats .stat-label {
  color: var(--gray-500);
  font-size: 0.875rem;
  font-weight: 500;
  display: block;
}

.achievement-card p {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.achievement-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.achievement-link {
  color: var(--primary-color);
  font-weight: 500;
  text-decoration: underline;
}

.achievement-link:hover {
  color: var(--secondary-color);
}

.awards-list {
  max-width: 900px;
  margin: 0 auto;
}

.award-item {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
}

.award-item.featured {
  border-left: 6px solid var(--accent-color);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.05), rgba(245, 158, 11, 0.02));
}

.award-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.award-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--gray-600), var(--gray-500));
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  flex-shrink: 0;
}

.award-icon.gold {
  background: linear-gradient(135deg, var(--accent-color), #fbbf24);
}

.award-icon svg {
  width: 28px;
  height: 28px;
  stroke-width: 2;
}

.award-content {
  flex: 1;
}

.award-content h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
  font-size: 1.5rem;
}

.award-details {
  margin-bottom: var(--spacing-md);
}

.award-institution {
  color: var(--primary-color);
  font-weight: 600;
  font-size: 1rem;
  display: block;
  margin-bottom: var(--spacing-xs);
}

.award-event,
.award-reason,
.award-year,
.award-activities {
  color: var(--gray-500);
  font-size: 0.875rem;
  font-style: italic;
  display: block;
}

.award-content p {
  color: var(--gray-600);
  line-height: 1.6;
  margin: 0;
}

.award-list {
  margin-top: var(--spacing-md);
  list-style: none;
}

.award-list li {
  color: var(--gray-600);
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-lg);
  position: relative;
}

.award-list li::before {
  content: '•';
  color: var(--primary-color);
  position: absolute;
  left: 0;
  font-weight: bold;
}

.recognition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.recognition-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: all var(--transition-normal);
}

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

.recognition-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
  font-family: var(--font-heading);
}

.recognition-label {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.recognition-description {
  color: var(--gray-600);
  font-size: 0.95rem;
}

/* ======= Contact Page Styles ======= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

.contact-info h2 {
  margin-bottom: var(--spacing-lg);
  color: var(--gray-900);
}

.contact-intro {
  font-size: 1.125rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-2xl);
}

.contact-methods {
  margin-bottom: var(--spacing-2xl);
}

.contact-method {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
  margin-bottom: var(--spacing-lg);
}

.method-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  flex-shrink: 0;
}

.method-icon svg {
  width: 24px;
  height: 24px;
  stroke-width: 2;
}

.method-details h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.method-details p {
  color: var(--gray-600);
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
}

.method-details a {
  color: var(--primary-color);
  font-weight: 600;
  font-size: 1.125rem;
}

.email-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.email-list a {
  color: var(--primary-color);
  font-weight: 600;
  font-size: 1rem;
  transition: color var(--transition-fast);
}

.email-list a:hover {
  color: var(--secondary-color);
}

.collaboration-areas h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

.interest-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.interest-tag {
  background-color: var(--primary-color);
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

.form-container {
  background: var(--white);
  padding: var(--spacing-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-200);
}

.form-container h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  color: var(--gray-700);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: var(--spacing-md);
  border: 2px solid var(--gray-200);
  border-radius: var(--border-radius-md);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
  font-family: var(--font-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.profiles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.profile-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.profile-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  color: inherit;
}

.profile-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  margin-bottom: var(--spacing-lg);
}

.profile-icon svg {
  width: 28px;
  height: 28px;
  stroke-width: 2;
}

.profile-info h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.profile-info p {
  color: var(--gray-600);
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
}

.profile-id {
  color: var(--primary-color);
  font-weight: 500;
  font-size: 0.875rem;
}

.response-card {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  border: 1px solid var(--gray-200);
}

.response-content {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
  padding: var(--spacing-2xl);
}

.response-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--success-color), #059669);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  flex-shrink: 0;
}

.response-icon svg {
  width: 28px;
  height: 28px;
  stroke-width: 2;
}

.response-text h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.response-text p {
  color: var(--gray-600);
  margin: 0;
  line-height: 1.6;
}

/* ======= Mobile Responsive Adjustments ======= */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
  
  .about-highlights {
    flex-direction: row;
    flex-wrap: wrap;
  }
  
  .highlight-card {
    flex: 1;
    min-width: 250px;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
  
  .timeline::before {
    left: 20px;
  }
  
  .timeline-item {
    flex-direction: row !important;
  }
  
  .timeline-marker {
    left: 20px;
    transform: translateX(-50%);
  }
  
  .timeline-content {
    width: calc(100% - 60px);
    margin-left: auto !important;
    margin-right: 0 !important;
  }
}

@media (max-width: 768px) {
  .expertise-grid {
    grid-template-columns: 1fr;
  }
  
  .books-grid {
    grid-template-columns: 1fr;
  }
  
  .achievements-grid {
    grid-template-columns: 1fr;
  }
  
  .profiles-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
  
  .award-item {
    flex-direction: column;
    text-align: center;
  }
  
  .response-content {
    flex-direction: column;
    text-align: center;
  }
  
  .patent-details {
    grid-template-columns: 1fr;
  }
  
  .book-details {
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: flex-start;
  }
  
  .contact-method {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-md);
  }
  
  .email-list {
    align-items: center;
  }
}

@media (max-width: 480px) {
  .hero-actions,
  .cta-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .stat-grid {
    grid-template-columns: 1fr;
  }
  
  .form-container {
    padding: var(--spacing-lg);
  }
  
  .profiles-grid {
    grid-template-columns: 1fr;
  }
  
  .patent-header,
  .paper-header,
  .conference-header,
  .copyright-header {
    flex-direction: column;
    align-items: flex-start;
  }
}