/* ==========================================================================
   Madushan Prabod Kumara - 3D Creative Developer & AI Researcher Portfolio
   Modern Dark Obsidian Glassmorphism Design System
   ========================================================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* CSS Variables */
:root {
  --bg-color: #06070a;
  --bg-secondary: #0d0f17;
  --card-bg: rgba(13, 17, 26, 0.68);
  --card-hover-bg: rgba(20, 26, 40, 0.78);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-glow: rgba(99, 102, 241, 0.35);
  
  --accent-indigo: #6366f1;
  --accent-cyan: #38bdf8;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #38bdf8 50%, #a855f7 100%);
  --accent-gradient-hover: linear-gradient(135deg, #4f46e5 0%, #0284c7 50%, #9333ea 100%);
  --glass-gradient: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
  
  --text-bright: #f8fafc;
  --text-body: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-heading: 'Outfit', sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 30px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 25px 60px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 35px rgba(99, 102, 241, 0.25);
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  background-color: var(--bg-color);
  color: var(--text-body);
  font-family: var(--font-sans);
  overflow-x: hidden;
  line-height: 1.65;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}

/* Fixed Three.js WebGL Canvas Chassis */
#webgl-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
  pointer-events: none; /* Mouse events pass through to UI overlay */
}

/* Noise & Vignette Overlay */
.bg-vignette {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 2;
  pointer-events: none;
  background: radial-gradient(circle at 50% 50%, rgba(6, 7, 10, 0.15) 0%, rgba(6, 7, 10, 0.88) 100%);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-indigo);
}

/* Utility Layout Classes */
main {
  position: relative;
  z-index: 3;
  width: 100%;
}

section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem 10%;
  position: relative;
}

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
}

/* Section Alignments to flow around 3D Mannequin */
.hero-section { justify-content: center; align-items: flex-start; }
.about-section { justify-content: center; align-items: flex-end; }
.journey-section { justify-content: center; align-items: flex-start; }
.skills-section { justify-content: center; align-items: flex-end; }
.projects-section { justify-content: center; align-items: flex-start; }
.research-section { justify-content: center; align-items: flex-end; }
.certs-section { justify-content: center; align-items: flex-start; }
.contact-section { justify-content: center; align-items: center; text-align: center; }

/* Navigation Bar */
nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1.5rem 4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  background: rgba(6, 7, 10, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: padding 0.3s ease, background 0.3s ease;
}

nav.scrolled {
  padding: 1rem 4rem;
  background: rgba(6, 7, 10, 0.88);
}

.logo {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.03em;
  color: var(--text-bright);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-badge {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 1.8rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-bright);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
}

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

.btn-nav-cv {
  padding: 0.55rem 1.2rem;
  font-size: 0.88rem;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.35);
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-nav-cv:hover {
  background: rgba(99, 102, 241, 0.25);
  border-color: var(--accent-cyan);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.2);
}

/* Mobile Nav Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 20px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 101;
}

.menu-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--text-bright);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* Glassmorphic UI Card Base */
.glass-card {
  max-width: 580px;
  width: 100%;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  padding: 3rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
}

.glass-card:hover {
  border-color: var(--card-border-glow);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.glass-card.wide-card {
  max-width: 920px;
}

.glass-card.full-width {
  max-width: 1100px;
}

/* Badges & Typography */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.1rem;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 4.2vw, 3.8rem);
  line-height: 1.1;
  margin-bottom: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-bright);
}

h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  margin-bottom: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-bright);
}

h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-bright);
}

p {
  color: var(--text-body);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Action Buttons */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.9rem 2.2rem;
  background: var(--accent-gradient);
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.98rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(99, 102, 241, 0.45);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-bright);
  box-shadow: none;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* Quick Stats Bar in Hero */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

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

.stat-number {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.76rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 0.2rem;
}

/* Quick Facts Matrix */
.facts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.fact-card {
  padding: 1rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.fact-title {
  font-size: 0.78rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.fact-value {
  font-size: 0.95rem;
  color: var(--text-bright);
  font-weight: 500;
}

/* References Accordion Box */
.references-box {
  margin-top: 1.75rem;
  padding: 1.25rem;
  background: rgba(99, 102, 241, 0.04);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: var(--radius-md);
}

.references-header {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ref-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.ref-card {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.ref-card strong {
  color: var(--text-bright);
  display: block;
  font-size: 0.92rem;
}

/* Journey Interactive Timeline */
.timeline {
  position: relative;
  padding-left: 2rem;
  margin-top: 1.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-indigo), var(--accent-cyan), var(--accent-purple));
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
}

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

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-color);
  border: 3px solid var(--accent-indigo);
  box-shadow: 0 0 10px var(--accent-indigo);
  transition: all 0.3s ease;
}

.timeline-item:hover .timeline-dot {
  background: var(--accent-cyan);
  border-color: #fff;
  transform: scale(1.2);
}

.timeline-year {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--accent-cyan);
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.timeline-content h3 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
}

.timeline-content p {
  font-size: 0.92rem;
  margin-bottom: 0;
  color: var(--text-muted);
}

/* Skills Category System */
.skills-container {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  margin-top: 1.5rem;
}

.skill-category-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.skill-tag {
  padding: 0.38rem 0.85rem;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  color: var(--text-body);
  font-weight: 500;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.skill-tag:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.4);
  color: var(--text-bright);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

/* Projects Filter & Grid */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.75rem;
}

.filter-btn {
  padding: 0.5rem 1.2rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent-gradient);
  border-color: transparent;
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 0.5rem;
}

.project-item {
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.025);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.project-item:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.project-badge {
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--accent-cyan);
  border-radius: var(--radius-full);
  align-self: flex-start;
  margin-bottom: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.project-item h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  color: var(--text-bright);
}

.project-item p {
  font-size: 0.9rem;
  margin-bottom: 1rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.project-tech-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.2rem;
}

.tech-pill {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 0.25rem 0.55rem;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
}

.project-links {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-top: auto;
}

.project-link {
  font-size: 0.85rem;
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: color var(--transition-fast);
}

.project-link:hover {
  color: #fff;
}

/* Research Publications List */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.publication-card {
  padding: 1.25rem 1.5rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.publication-card:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(168, 85, 247, 0.35);
  transform: translateX(4px);
}

.pub-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 0.4rem;
}

.pub-venue {
  font-size: 0.86rem;
  color: var(--accent-cyan);
  margin-bottom: 0.3rem;
  font-weight: 500;
}

.pub-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* Certifications Badges Grid */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.cert-category {
  padding: 1rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
}

.cert-provider {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-purple);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.cert-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.cert-list li {
  font-size: 0.88rem;
  color: var(--text-body);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.cert-list li::before {
  content: '✓';
  color: var(--accent-emerald);
  font-weight: bold;
}

/* Contact Cards & Form */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2rem;
  text-align: left;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-detail-card {
  padding: 1.2rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.contact-detail-card:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-2px);
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #fff;
  flex-shrink: 0;
}

.contact-text label {
  font-size: 0.78rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
}

.contact-text span {
  font-size: 0.98rem;
  color: var(--text-bright);
  font-weight: 600;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.social-btn {
  padding: 0.6rem 1.1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-body);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.social-btn:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: var(--accent-indigo);
  color: #fff;
  transform: translateY(-2px);
}

/* Glass Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 0.85rem 1.1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  color: var(--text-bright);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-indigo);
  background: rgba(99, 102, 241, 0.05);
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.2);
}

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

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  padding: 1rem 1.5rem;
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid var(--accent-indigo);
  border-radius: var(--radius-md);
  color: var(--text-bright);
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: slideInRight 0.3s ease forwards;
}

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

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: var(--text-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--accent-gradient);
  transform: translateY(-3px);
}

/* Footer */
footer {
  position: relative;
  z-index: 3;
  padding: 3rem 10% 2rem;
  background: rgba(6, 7, 10, 0.95);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center;
}

.footer-content {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-quote {
  font-style: italic;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Responsive Styles */
@media (max-width: 1024px) {
  section {
    padding: 6rem 6%;
    justify-content: center !important;
    align-items: center !important;
  }
  
  .glass-card {
    max-width: 100% !important;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  nav {
    padding: 1.2rem 2rem;
  }
  
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: rgba(13, 17, 26, 0.98);
    backdrop-filter: blur(25px);
    flex-direction: column;
    justify-content: center;
    padding: 3rem 2rem;
    transition: right 0.4s ease;
    border-left: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .nav-links.active {
    right: 0;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .project-grid {
    grid-template-columns: 1fr;
  }
  
  .certs-grid {
    grid-template-columns: 1fr;
  }
  
  .facts-grid {
    grid-template-columns: 1fr;
  }
  
  .ref-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   3D VR Developer Avatar Card & Interactive Glass Showcase
   ========================================================================== */
.about-grid-container {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2.5rem;
  align-items: center;
  margin-bottom: 2rem;
}

@media (max-width: 900px) {
  .about-grid-container {
    grid-template-columns: 1fr;
  }
}

.about-avatar-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1000px;
}

.avatar-card-glass {
  position: relative;
  width: 260px;
  height: 330px;
  border-radius: var(--radius-xl);
  background: radial-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(13, 17, 26, 0.7) 100%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(20px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(99, 102, 241, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding: 1.5rem;
  overflow: hidden;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.5s ease;
  animation: avatarFloat 4s ease-in-out infinite alternate;
}

.avatar-card-glass:hover {
  transform: translateY(-8px) rotateY(6deg) rotateX(-4deg);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.7), 0 0 45px rgba(56, 189, 248, 0.35);
  border-color: rgba(56, 189, 248, 0.4);
}

.avatar-glow-ring {
  position: absolute;
  top: -40%;
  left: -40%;
  width: 180%;
  height: 180%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.2) 0%, rgba(99, 102, 241, 0.1) 45%, transparent 70%);
  pointer-events: none;
  animation: rotateGlow 12s linear infinite;
}

.about-avatar-img {
  position: absolute;
  top: 10px;
  height: 275px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 15px 25px rgba(0, 0, 0, 0.6));
  z-index: 2;
  transition: transform 0.4s ease;
}

.avatar-card-glass:hover .about-avatar-img {
  transform: scale(1.05) translateY(-4px);
}

.avatar-status-badge {
  position: relative;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  background: rgba(13, 17, 26, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-bright);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulseGlow 1.8s infinite;
}

@keyframes avatarFloat {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-12px); }
}

@keyframes rotateGlow {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes pulseGlow {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}