/* OpenAI-Inspired Theme - Clean, Minimal, Black & White with Green Accent */
/* Universal styles for both desktop and mobile */

:root {
  /* Color Palette - OpenAI inspired with green accent */
  --primary-black: #0d0d0d;
  --secondary-black: #1a1a1a;
  --text-primary: #171717;
  --text-secondary: #525252;
  --text-muted: #737373;
  --pure-white: #ffffff;
  --off-white: #fafafa;
  --light-gray: #f5f5f5;
  --border-light: #e5e5e5;
  --border-medium: #d4d4d4;
  
  /* Green accents */
  --accent-green: #16a34a;
  --accent-green-light: #22c55e;
  --accent-green-dark: #15803d;
  --accent-green-subtle: rgba(22, 163, 74, 0.1);
  --accent-green-hover: rgba(22, 163, 74, 0.05);
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* 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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

/* Global Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Base HTML & Body */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family) !important;
  font-weight: var(--font-weight-normal) !important;
  line-height: 1.6 !important;
  color: var(--text-primary) !important;
  background-color: var(--pure-white) !important;
  margin: 0 !important;
  padding: 0 !important;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography Scale */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  color: var(--primary-black);
  margin-bottom: var(--spacing-md);
  margin-top: 0;
}

h1 {
  font-size: 3rem;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.025em;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 2.25rem;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.875rem;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
}

h4 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

h5 {
  font-size: 1.25rem;
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-sm);
}

h6 {
  font-size: 1.125rem;
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-sm);
}

p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  margin-top: 0;
}

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

a:hover {
  color: var(--accent-green-dark);
  text-decoration: underline;
}

/* Lists */
ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

li {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Publication list styling - specific for numbered lists */
ol li {
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--pure-white);
  transition: all 0.2s ease;
  list-style-position: inside;
}

ol li:hover {
  border-color: var(--accent-green);
  box-shadow: var(--shadow-sm);
}

ol li strong {
  color: var(--primary-black);
  font-weight: var(--font-weight-semibold);
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: 1.1rem;
}

/* Code */
code {
  font-family: "Fira Code", "Monaco", "Consolas", monospace;
  background: var(--light-gray);
  padding: 0.125rem 0.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

pre {
  background: var(--light-gray);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  min-height: 44px;
}

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

.btn-primary:hover {
  background: var(--secondary-black);
  color: var(--pure-white);
  text-decoration: none;
}

.btn-secondary {
  background: var(--pure-white);
  color: var(--primary-black);
  border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
  background: var(--light-gray);
  text-decoration: none;
}

.btn-accent {
  background: var(--accent-green);
  color: var(--pure-white);
}

.btn-accent:hover {
  background: var(--accent-green-dark);
  color: var(--pure-white);
  text-decoration: none;
}

/* Navigation Styles */
.openai-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  padding: 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--primary-black);
  text-decoration: none;
}

.nav-brand:hover {
  color: var(--accent-green);
  text-decoration: none;
}

.nav-social-icons {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: transparent;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.2s ease;
  font-size: 0.9rem;
}

.nav-social-icon:hover {
  background: var(--accent-green-hover);
  color: var(--accent-green);
  text-decoration: none;
  transform: translateY(-1px);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.5rem 0;
  transition: color 0.2s ease;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-black);
  text-decoration: none;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-green);
  border-radius: 1px;
}

/* Mobile Navigation */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.mobile-menu-btn:hover {
  background: var(--accent-green-hover);
}

.hamburger {
  width: 24px;
  height: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hamburger-line {
  width: 100%;
  height: 2px;
  background: var(--primary-black);
  border-radius: 1px;
  transition: all 0.3s ease;
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-menu-btn.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active .hamburger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--pure-white);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-lg);
}

.mobile-menu.show {
  display: block;
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-menu-links {
  padding: var(--spacing-lg) var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.mobile-menu-link {
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border-light);
  transition: color 0.2s ease;
}

.mobile-menu-link:last-child {
  border-bottom: none;
}

.mobile-menu-link:hover,
.mobile-menu-link.active {
  color: var(--accent-green);
  text-decoration: none;
}

/* Main Content */
.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  margin-top: 64px; /* Account for fixed nav */
}

.content-section {
  padding: var(--spacing-xl) 0;
}

.content-section:first-child {
  padding-top: var(--spacing-lg);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(135deg, 
    #3b82f6 0%, 
    #60a5fa 25%, 
    #93c5fd 50%, 
    #6ee7b7 75%, 
    #a7f3d0 100%);
  border-radius: var(--radius-xl);
  margin: var(--spacing-xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, 
    rgba(59, 130, 246, 0.8) 0%, 
    rgba(96, 165, 250, 0.8) 25%, 
    rgba(147, 197, 253, 0.7) 50%, 
    rgba(110, 231, 183, 0.7) 75%, 
    rgba(167, 243, 208, 0.6) 100%);
  backdrop-filter: blur(1px);
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero h1 {
  margin-bottom: var(--spacing-lg);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  color: var(--pure-white);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  font-size: 3.5rem;
  font-weight: var(--font-weight-bold);
}

.hero p {
  font-size: 1.25rem;
  color: var(--pure-white);
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  line-height: 1.8;
  font-weight: var(--font-weight-medium);
}

.hero-tagline {
  font-size: 1.3rem !important;
  font-weight: var(--font-weight-semibold) !important;
  color: var(--pure-white) !important;
  margin-bottom: 0 !important;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2) !important;
  font-style: italic;
}

/* Typing Animation */
.typing-container {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  min-height: 120px;
  margin: 0 auto var(--spacing-lg);
  max-width: 700px;
}

.typing-text {
  font-size: 1.25rem !important;
  color: var(--primary-black) !important;
  text-shadow: 0 1px 3px rgba(255, 255, 255, 0.8) !important;
  line-height: 1.8 !important;
  font-weight: var(--font-weight-medium) !important;
  margin: 0 !important;
  text-align: center;
}

.typing-cursor {
  font-size: 1.25rem;
  color: var(--primary-black);
  font-weight: var(--font-weight-medium);
  animation: blink 1s infinite;
  margin-left: 2px;
  text-shadow: 0 1px 3px rgba(255, 255, 255, 0.8);
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* Cards */
.card {
  background: var(--pure-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all 0.2s ease;
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

/* Profile Section */
.profile-section {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

.profile-card {
  background: var(--pure-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  position: sticky;
  top: 80px;
}

.profile-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  margin: 0 auto var(--spacing-lg);
  border: 4px solid var(--accent-green);
  object-fit: cover;
}

.profile-name {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--primary-black);
  margin-bottom: var(--spacing-sm);
}

.profile-title {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  font-size: 0.95rem;
}

.social-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.social-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: background 0.2s ease;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.social-link:hover {
  background: var(--accent-green-hover);
  color: var(--accent-green);
  text-decoration: none;
}

/* Content Area */
.content-main {
  background: var(--pure-white);
}

/* Page-specific styles */
.page-content {
  max-width: none;
}

.page-content h1 {
  border-bottom: 2px solid var(--accent-green);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  margin-top: 0;
}

.page-content h2 {
  color: var(--primary-black);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.page-content h3 {
  color: var(--text-primary);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

/* Lists */
ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

li {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Publication list styling - specific for numbered lists */
ol li {
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--pure-white);
  transition: all 0.2s ease;
  list-style-position: inside;
}

ol li:hover {
  border-color: var(--accent-green);
  box-shadow: var(--shadow-sm);
}

ol li strong {
  color: var(--primary-black);
  font-weight: var(--font-weight-semibold);
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: 1.1rem;
}

/* Publication list styling */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.publication-item {
  padding: var(--spacing-lg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  background: var(--pure-white);
  transition: all 0.2s ease;
}

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

.publication-title {
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
  color: var(--primary-black);
  margin-bottom: var(--spacing-sm);
}

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

.publication-venue {
  color: var(--accent-green);
  font-weight: var(--font-weight-medium);
  font-size: 0.9rem;
}

/* Experience timeline */
.experience-timeline {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.experience-item {
  position: relative;
  padding-left: var(--spacing-xl);
  padding: var(--spacing-lg);
  border-left: 3px solid var(--accent-green);
  background: var(--accent-green-subtle);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.experience-title {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  color: var(--primary-black);
  margin-bottom: var(--spacing-xs);
}

.experience-company {
  color: var(--accent-green);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-sm);
}

.experience-duration {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
}

/* Research Interests */
.research-item {
  padding: var(--spacing-lg);
  border-left: 3px solid var(--accent-green);
  background: var(--accent-green-subtle);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: var(--spacing-lg);
}

/* Footer */
.footer {
  background: var(--light-gray);
  border-top: 1px solid var(--border-light);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-3xl);
  text-align: center;
}

.footer p {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

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

.footer a:hover {
  color: var(--accent-green);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --spacing-xl: 1.25rem;
    --spacing-2xl: 2rem;
    --spacing-3xl: 2.5rem;
  }
  
  h1 { 
    font-size: 2.25rem; 
    margin-bottom: var(--spacing-md);
  }
  h2 { 
    font-size: 1.875rem; 
    margin-bottom: var(--spacing-sm);
  }
  h3 { 
    font-size: 1.5rem; 
    margin-bottom: var(--spacing-sm);
  }
  
  .nav-links { display: none; }
  .mobile-menu-btn { display: block; }
  
  .nav-brand-section {
    gap: var(--spacing-md);
  }
  
  .nav-social-icons {
    gap: var(--spacing-xs);
  }
  
  .nav-social-icon {
    width: 28px;
    height: 28px;
    font-size: 0.8rem;
  }
  
  .profile-section {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .profile-card {
    position: static;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .main-container {
    padding: 0 var(--spacing-lg);
  }
  
  .nav-container {
    padding: 0 var(--spacing-lg);
  }
  
  .content-section {
    padding: var(--spacing-md) 0;
  }
  
  ol li {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
  }
  
  /* Mobile hero adjustments */
  .hero {
    padding: var(--spacing-2xl) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
  }
  
  .hero h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
  }
  
  .hero p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
  }
  
  .hero-tagline {
    font-size: 1.15rem !important;
  }
  
  /* Mobile typing animation adjustments */
  .typing-container {
    min-height: 160px;
  }
  
  .typing-text {
    font-size: 1.1rem !important;
    line-height: 1.7 !important;
  }
  
  .typing-cursor {
    font-size: 1.1rem;
  }
}