@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ==========================================================================
   CSS Custom Properties (Variables)
   ========================================================================== */
:root {
  /* Light Theme Variables */
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-navbar: rgba(248, 250, 252, 0.8);
  --border-color: rgba(226, 232, 240, 0.8);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --accent-primary: #3b82f6; /* Blue for Industry */
  --accent-primary-rgb: 59, 130, 246;
  --accent-academic: #d97706; /* Amber for Academia */
  --accent-academic-rgb: 217, 119, 6;
  
  --glow-color: rgba(59, 130, 246, 0.15);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --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);
  
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --border-radius-xl: 30px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* Dark Theme Variables */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-navbar: rgba(11, 15, 25, 0.8);
  --border-color: rgba(31, 41, 55, 0.7);
  
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  
  --accent-primary: #6366f1; /* Indigo for Industry */
  --accent-primary-rgb: 99, 102, 241;
  --accent-academic: #fbbf24; /* Warm Gold for Academia */
  --accent-academic-rgb: 251, 191, 36;
  
  --glow-color: rgba(99, 102, 241, 0.25);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.6);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  scroll-padding-top: 5rem;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-fast);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--border-radius-sm);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

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

svg {
  display: block;
  flex-shrink: 0;
  max-width: 100%;
  max-height: 100%;
}

/* Helper to handle global accent colors depending on Mode */
body.mode-academia {
  --accent-active: var(--accent-academic);
  --accent-active-rgb: var(--accent-academic-rgb);
}
body.mode-industry {
  --accent-active: var(--accent-primary);
  --accent-active-rgb: var(--accent-primary-rgb);
}

/* ==========================================================================
   Dual Mode Display Rules
   ========================================================================== */
body.mode-academia .industry-only {
  display: none !important;
}
body.mode-industry .academia-only {
  display: none !important;
}

/* Transition animations for content switching */
.mode-fade-in {
  animation: fadeIn var(--transition-slow);
}

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

/* ==========================================================================
   Layout Containers
   ========================================================================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border-color);
}

/* ==========================================================================
   Navigation Bar (Glassmorphism)
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--bg-navbar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-slow), border-color var(--transition-slow);
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4.5rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.navbar-brand {
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar-brand span {
  background: linear-gradient(135deg, var(--accent-academic) 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 0.5rem 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-active);
  transition: width var(--transition-fast);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Mobile Menu Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
}

/* ==========================================================================
   Polished Toggle Controls (Mode and Theme Switchers)
   ========================================================================== */

/* Toggle Pill Container */
.switcher-pill {
  display: flex;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-xl);
  padding: 3px;
  position: relative;
}

.switcher-pill-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  cursor: pointer;
  border-radius: var(--border-radius-lg);
  transition: color var(--transition-fast);
  z-index: 1;
}

.switcher-pill-btn.active {
  color: #ffffff;
}

.switcher-pill-btn.active.academia-btn {
  background-color: var(--accent-academic);
}

.switcher-pill-btn.active.industry-btn {
  background-color: var(--accent-primary);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 2.2rem;
  height: 2.2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--bg-secondary);
  color: var(--accent-active);
  transform: scale(1.05);
}

.theme-toggle-btn svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
}

/* Hide inactive theme icons */
[data-theme="dark"] .theme-toggle-btn .sun-icon {
  display: block;
}
[data-theme="dark"] .theme-toggle-btn .moon-icon {
  display: none;
}
.theme-toggle-btn .sun-icon {
  display: none;
}
.theme-toggle-btn .moon-icon {
  display: block;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding-top: 8rem;
  padding-bottom: 5rem;
  background: radial-gradient(circle at 90% 10%, var(--glow-color) 0%, transparent 40%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.avatar-container {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  padding: 6px;
  background: linear-gradient(135deg, var(--accent-academic) 0%, var(--accent-primary) 100%);
  box-shadow: 0 0 30px var(--glow-color);
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.avatar-container:hover {
  transform: scale(1.02);
  box-shadow: 0 0 40px var(--accent-active);
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  background-color: var(--bg-secondary);
}

/* SVG Avatar Fallback style */
.avatar-fallback {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Outfit', sans-serif;
  font-size: 4rem;
  font-weight: 800;
  color: #ffffff;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

.hero-text {
  display: flex;
  flex-direction: column;
}

.badge-mode {
  align-self: flex-start;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.3rem 0.8rem;
  border-radius: var(--border-radius-xl);
  margin-bottom: 1rem;
}

body.mode-academia .badge-mode {
  background-color: rgba(217, 119, 6, 0.1);
  color: var(--accent-academic);
  border: 1px solid rgba(217, 119, 6, 0.2);
}

body.mode-industry .badge-mode {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--accent-primary);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.hero-name {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.1;
}

.hero-title {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--accent-active);
  margin-bottom: 1.5rem;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 600px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-primary {
  background-color: var(--accent-active);
  color: #ffffff;
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(var(--accent-active-rgb), 0.3);
}

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

.btn-secondary:hover {
  background-color: var(--bg-secondary);
  transform: translateY(-2px);
}

/* Social Icon Bar */
.social-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.social-btn {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.social-btn:hover {
  color: var(--accent-active);
  border-color: var(--accent-active);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px var(--glow-color);
}

.social-btn svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

/* ==========================================================================
   Dual-Mode Switcher Callout Box
   ========================================================================== */
.mode-intro-card {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: var(--border-radius-md);
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.mode-intro-text p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.mode-intro-text strong {
  color: var(--text-primary);
}

/* ==========================================================================
   Grid & Card Layouts (Projects and Highlights)
   ========================================================================== */
.section-header {
  margin-bottom: 3.5rem;
}

.section-tag {
  color: var(--accent-active);
  text-transform: uppercase;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
}

.section-desc {
  color: var(--text-muted);
  max-width: 600px;
  margin-top: 0.5rem;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 2rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

/* Glow Border hover effect */
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--accent-active), transparent);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.card:hover {
  transform: translateY(-5px);
  border-color: rgba(var(--accent-active-rgb), 0.3);
  box-shadow: var(--shadow-lg);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-icon {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background-color: rgba(var(--accent-active-rgb), 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--accent-active);
  margin-bottom: 1.5rem;
}

.card-icon svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: currentColor;
}

.card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.card-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.card-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--border-radius-sm);
}

.card-link {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent-active);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.card-link:hover {
  color: var(--text-primary);
}

/* ==========================================================================
   Publications List
   ========================================================================== */
.publications-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.pub-filters {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.filter-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1.2rem;
  border-radius: var(--border-radius-xl);
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
  background-color: var(--accent-academic);
  border-color: var(--accent-academic);
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(var(--accent-academic-rgb), 0.2);
}

.pub-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 1.5rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  align-items: start;
}

.pub-card:hover {
  border-color: var(--accent-academic);
  transform: translateX(4px);
}

.pub-year {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--accent-academic);
  background-color: rgba(var(--accent-academic-rgb), 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-sm);
  text-align: center;
  min-width: 60px;
}

.pub-details {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.pub-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.pub-authors {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

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

.pub-journal {
  font-size: 0.9rem;
  font-style: italic;
  color: var(--text-muted);
}

.pub-tags {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.pub-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}

.pub-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-academic);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.pub-link:hover {
  text-decoration: underline;
}

.pub-show-more {
  display: flex;
  justify-content: center;
  margin-top: 2rem;
}

/* ==========================================================================
   CV Timeline Section
   ========================================================================== */
.cv-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
}

.cv-column-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  border-left: 2px solid var(--border-color);
  padding-left: 1.5rem;
  position: relative;
}

.timeline-item {
  position: relative;
}

/* Timeline dot */
.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1.5rem - 6px - 1px);
  top: 0.3rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--accent-active);
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 0 4px rgba(var(--accent-active-rgb), 0.15);
  transition: all var(--transition-fast);
}

.timeline-item:hover::before {
  background-color: var(--text-primary);
  transform: scale(1.2);
}

.timeline-date {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent-active);
  margin-bottom: 0.25rem;
}

.timeline-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timeline-institution {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Skills grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.skill-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: var(--border-radius-md);
  transition: border-color var(--transition-fast);
}

.skill-card:hover {
  border-color: var(--accent-active);
}

.skill-category {
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.skill-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.skill-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.skill-bar {
  height: 4px;
  background-color: var(--border-color);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 0.25rem;
}

.skill-bar-fill {
  height: 100%;
  background-color: var(--accent-active);
  border-radius: 2px;
}

/* ==========================================================================
   Contact Section & Form
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 3.5rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-icon {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--accent-active);
}

.contact-icon svg {
  width: 1.1rem;
  height: 1.1rem;
  fill: currentColor;
}

.contact-details h4 {
  font-size: 0.9rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.contact-details p, .contact-details a {
  font-size: 1.05rem;
  color: var(--text-primary);
  font-weight: 500;
}

.contact-form {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  border-radius: var(--border-radius-md);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.form-control {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-active);
  box-shadow: 0 0 0 3px rgba(var(--accent-active-rgb), 0.15);
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
  background-color: var(--bg-secondary);
  padding: 3rem 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.footer-text {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Responsive Design Breakpoints
   ========================================================================== */

/* Tablet View: max-width 992px */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }
  .hero-visual {
    order: -1;
  }
  .hero-actions, .social-links {
    justify-content: center;
  }
  .badge-mode {
    align-self: center;
  }
  .cv-grid, .contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

/* Mobile / Tablet Navigation */
@media (max-width: 992px) {
  section {
    padding: 3.5rem 0;
  }
  
  .navbar-container {
    height: 4rem;
  }
  
  .mobile-nav-toggle {
    display: block;
  }
  
  .nav-links {
    position: fixed;
    top: 4rem;
    left: 0;
    right: 0;
    bottom: auto;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    background-color: var(--bg-navbar);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 3rem 1.5rem;
    gap: 2rem;
    transform: translateY(-150%);
    transition: transform var(--transition-slow);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
  }
  
  .nav-links.open {
    transform: translateY(0);
  }
  
  .nav-controls {
    gap: 0.75rem;
  }
  
  .hero-name {
    font-size: 2.75rem;
  }
  
  .hero-title {
    font-size: 1.5rem;
  }
  
  .hero-desc {
    font-size: 1.05rem;
  }
  
  .avatar-container {
    width: 220px;
    height: 220px;
  }
}

/* Mobile View: max-width 768px (Portrait Smartphones) */
@media (max-width: 768px) {
  
  .pub-card {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  
  .pub-year {
    align-self: start;
  }
}

/* Small Mobile View: max-width 480px */
@media (max-width: 480px) {
  .hero-name {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .card {
    padding: 1.5rem;
  }
  .contact-form {
    padding: 1.5rem;
  }
  .switcher-pill-btn {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
  }
}