/* About Page Modern Style */

/* CSS Variables */
:root {
  --primary-color: #4f46e5;
  --secondary-color: #06b6d4;
  --accent-color: #f59e0b;
  --text-dark: #1f2937;
  --text-light: #6b7280;
  --text-lighter: #9ca3af;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: rgba(255, 255, 255, 0.95);
  --border-color: rgba(229, 231, 235, 0.8);
  --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);
  --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  --gradient-accent: linear-gradient(135deg, var(--accent-color), #ef4444);
  --gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background: var(--bg-secondary);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

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

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="20" cy="20" r="1.5" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1" fill="rgba(255,255,255,0.08)"/><circle cx="40" cy="80" r="1.2" fill="rgba(255,255,255,0.06)"/><circle cx="60" cy="10" r="0.8" fill="rgba(255,255,255,0.05)"/><circle cx="10" cy="60" r="1.1" fill="rgba(255,255,255,0.07)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  text-align: center;
}

.hero-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 2rem;
}

.hero-profile {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: center;
  min-height: 80vh;
}

/* Profile Image */
.profile-image-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-avatar {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  object-fit: cover;
  border: 8px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-xl);
  transition: all 0.4s ease;
  animation: float 6s ease-in-out infinite;
}

.profile-ring {
  position: absolute;
  width: 320px;
  height: 320px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: rgba(255, 255, 255, 0.8);
  border-right-color: rgba(255, 255, 255, 0.8);
  animation: spin 20s linear infinite;
}

.profile-status-badge {
  position: absolute;
  bottom: 20px;
  right: 20px;
  background: var(--gradient-primary);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: pulse-badge 2s infinite;
}

/* Hero Text */
.hero-text {
  text-align: left;
  color: white;
}

.hero-name {
  margin-bottom: 1rem;
  animation: slideInRight 1s ease-out;
}

.name-en {
  display: block;
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #ffffff, #e5e7eb);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.name-zh {
  display: block;
  font-size: 2rem;
  font-weight: 400;
  opacity: 0.9;
  letter-spacing: 2px;
}

.hero-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: 0.5rem;
  animation: slideInRight 1s ease-out 0.2s both;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 3rem;
  animation: slideInRight 1s ease-out 0.4s both;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  gap: 3rem;
  margin-bottom: 3rem;
  animation: fadeInUp 1s ease-out 0.6s both;
}

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

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: white;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.8);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Hero Actions */
.hero-actions {
  display: flex;
  gap: 1.5rem;
  animation: fadeInUp 1s ease-out 0.8s both;
}

.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 50px;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  backdrop-filter: blur(10px);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-primary:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
}

.btn-secondary {
  background: transparent;
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.8);
  transform: translateY(-3px);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-arrow {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.5rem;
}

/* About Content Section */
.about-content-section {
  padding: 6rem 0;
  background: var(--bg-secondary);
}

.content-card {
  background: var(--bg-card);
  border-radius: 24px;
  padding: 3rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.content-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.card-title {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 3px solid var(--primary-color);
}

.card-title i {
  color: var(--primary-color);
  font-size: 1.8rem;
}

/* Biography Card */
.biography-content .intro-text {
  font-size: 1.2rem;
  line-height: 1.8;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.biography-content p {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

.highlight-box {
  background: var(--gradient-primary);
  color: white;
  padding: 2rem;
  border-radius: 16px;
  margin-top: 2rem;
  position: relative;
  overflow: hidden;
}

.highlight-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/></svg>');
  opacity: 0.2;
}

.highlight-box i {
  font-size: 2rem;
  opacity: 0.7;
  margin-bottom: 1rem;
}

.highlight-box p {
  font-size: 1.2rem;
  font-style: italic;
  line-height: 1.6;
  margin: 0;
  position: relative;
  z-index: 1;
}

/* Interests Grid */
.interests-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.interest-item {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  text-align: center;
}

.interest-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.interest-icon {
  width: 80px;
  height: 80px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  transition: all 0.3s ease;
}

.interest-item:hover .interest-icon {
  transform: scale(1.1);
}

.interest-icon i {
  font-size: 2rem;
  color: white;
}

.interest-item h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 1rem;
}

.interest-item p {
  color: var(--text-light);
  line-height: 1.6;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 1rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gradient-primary);
}

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
  padding-left: 3rem;
}

.timeline-marker {
  position: absolute;
  left: -2.5rem;
  top: 0.5rem;
  width: 1rem;
  height: 1rem;
  background: var(--primary-color);
  border-radius: 50%;
  border: 3px solid var(--bg-primary);
  box-shadow: var(--shadow-md);
}

.timeline-content {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.timeline-content:hover {
  transform: translateX(10px);
  box-shadow: var(--shadow-md);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.timeline-header h3 {
  color: var(--text-dark);
  font-size: 1.3rem;
  font-weight: 600;
}

.timeline-date {
  background: var(--gradient-primary);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

.timeline-institution {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.timeline-description {
  color: var(--text-light);
  line-height: 1.6;
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.skill-category h3 {
  color: var(--text-dark);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-color);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.skill-tag {
  background: var(--bg-primary);
  color: var(--text-dark);
  padding: 0.6rem 1.2rem;
  border-radius: 25px;
  border: 1px solid var(--border-color);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.skill-tag:hover {
  background: var(--gradient-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.skill-tag.python { border-color: #3776ab; }
.skill-tag.matlab { border-color: #e16737; }
.skill-tag.r { border-color: #276dc3; }
.skill-tag.fortran { border-color: #734f96; }

/* Contact Section */
.contact-section {
  background: var(--gradient-bg);
  padding: 6rem 0;
  color: white;
}

.contact-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 3rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.contact-card .card-title {
  color: white;
  border-color: rgba(255, 255, 255, 0.3);
}

.contact-card .card-title i {
  color: rgba(255, 255, 255, 0.9);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 2rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
}

.contact-item:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-5px);
}

.contact-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.contact-icon.university { background: rgba(79, 70, 229, 0.8); }
.contact-icon.email { background: rgba(239, 68, 68, 0.8); }
.contact-icon.phone { background: rgba(34, 197, 94, 0.8); }
.contact-icon.location { background: rgba(245, 158, 11, 0.8); }

.contact-info h4 {
  color: white;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.contact-info p {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  margin-bottom: 0.3rem;
}

.contact-info span {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

.contact-info a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

.contact-info a:hover {
  color: white;
}

/* Social Links */
.social-links-section h3 {
  color: white;
  text-align: center;
  margin-bottom: 2rem;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.social-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  text-decoration: none;
  transition: all 0.3s ease;
  min-width: 100px;
}

.social-link:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-5px);
  color: white;
}

.social-link i {
  font-size: 2rem;
}

.social-link span {
  font-size: 0.9rem;
  font-weight: 500;
}

.social-link.email:hover { background: rgba(239, 68, 68, 0.3); }
.social-link.github:hover { background: rgba(55, 65, 81, 0.3); }
.social-link.researchgate:hover { background: rgba(0, 204, 187, 0.3); }
.social-link.orcid:hover { background: rgba(166, 206, 57, 0.3); }

/* Animations */
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes pulse-badge {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-profile {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  
  .hero-text {
    text-align: center;
  }
  
  .hero-avatar {
    width: 250px;
    height: 250px;
  }
  
  .profile-ring {
    width: 270px;
    height: 270px;
  }
  
  .name-en {
    font-size: 3rem;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .hero-container {
    padding: 0 1rem;
  }
  
  .content-card {
    padding: 2rem;
    margin-bottom: 2rem;
  }
  
  .hero-avatar {
    width: 200px;
    height: 200px;
  }
  
  .profile-ring {
    width: 220px;
    height: 220px;
  }
  
  .name-en {
    font-size: 2.5rem;
  }
  
  .name-zh {
    font-size: 1.5rem;
  }
  
  .hero-stats {
    gap: 2rem;
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .interests-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .timeline-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

@media (max-width: 576px) {
  .hero-actions {
    flex-direction: column;
    gap: 1rem;
  }
  
  .btn-primary, .btn-secondary {
    justify-content: center;
    width: 100%;
  }
  
  .social-links {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  
  .card-title {
    font-size: 1.5rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --text-dark: #f9fafb;
    --text-light: #d1d5db;
    --text-lighter: #9ca3af;
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --bg-card: rgba(31, 41, 55, 0.95);
    --border-color: rgba(75, 85, 99, 0.8);
  }
}