/* ===================================
   Shahroz Rahman - Personal Portfolio
   Sci-Fi Cyber Matrix Theme
   =================================== */

/* CSS Variables */
:root {
  /* Colors - Cyberpunk Theme (Dark) */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a24;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0b0;
  --text-light: #707080;

  /* Neon Accents */
  --neon-green: #00ff41;
  --neon-cyan: #00ffff;
  --neon-purple: #bd00ff;
  --neon-pink: #ff006e;
  --accent: var(--neon-cyan);
  --accent-hover: var(--neon-green);
  --accent-secondary: var(--neon-purple);

  /* Glow Effects */
  --glow-green: 0 0 5px #00ff41, 0 0 10px #00ff41, 0 0 20px #00ff41;
  --glow-cyan: 0 0 5px #00ffff, 0 0 10px #00ffff, 0 0 20px #00ffff;
  --glow-purple: 0 0 5px #bd00ff, 0 0 10px #bd00ff, 0 0 20px #bd00ff;

  /* Typography - Monospace for terminal feel */
  --font-family: 'Courier New', 'Courier', monospace;
  --font-family-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;

  /* 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;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;
}

/* ===================================
   Base Styles
   =================================== */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* Matrix Rain Canvas */
#matrix-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.15;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

/* Scan Line Overlay */
.scan-line {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--neon-cyan), transparent);
  box-shadow: 0 0 10px var(--neon-cyan);
  animation: scan 4s linear infinite;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.5;
  transition: opacity var(--transition-base);
}

@keyframes scan {
  0% { top: 0; }
  100% { top: 100%; }
}

/* Matrix Background Effect */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0, 255, 65, 0.03) 2px,
      rgba(0, 255, 65, 0.03) 4px
    );
  pointer-events: none;
  z-index: 1;
  animation: scanlines 8s linear infinite;
}

@keyframes scanlines {
  0% { transform: translateY(0); }
  100% { transform: translateY(10px); }
}

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

a:hover {
  color: var(--accent-hover);
  text-shadow: var(--glow-green);
}

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

/* ===================================
   Utility Classes
   =================================== */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  position: relative;
  z-index: 2;
}

/* Cyber Card Style */
.cyber-card {
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.3);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.cyber-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(0, 255, 255, 0.1),
    transparent
  );
  transition: left var(--transition-slow);
}

.cyber-card:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
  transform: translateY(-2px);
}

.cyber-card:hover::before {
  left: 100%;
}

/* Section Styles */
.section {
  padding: var(--spacing-3xl) 0;
  position: relative;
  z-index: 2;
}

.section-alt {
  background: rgba(18, 18, 26, 0.5);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-header p {
  font-family: var(--font-family-heading);
  color: var(--text-secondary);
  margin-top: var(--spacing-md);
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-tag {
  display: inline-block;
  color: var(--neon-green);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-sm);
  position: relative;
  padding: var(--spacing-xs) var(--spacing-md);
  border: 1px solid var(--neon-green);
  border-radius: var(--radius-sm);
  text-shadow: var(--glow-green);
}

.section-title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  position: relative;
  display: inline-block;
  text-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
}

.section-title::after {
  content: '_';
  color: var(--neon-cyan);
  animation: blink 1s infinite;
}

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

/* Gradient Text */
.gradient-text {
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: transparent;
  color: var(--neon-cyan);
  border: 2px solid var(--neon-cyan);
  box-shadow: inset 0 0 10px rgba(0, 255, 255, 0.2);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--neon-cyan);
  transition: left var(--transition-base);
  z-index: -1;
}

.btn-primary:hover {
  color: var(--bg-primary);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.5);
  text-shadow: none;
}

.btn-primary:hover::before {
  left: 0;
}

.btn-secondary {
  background: transparent;
  color: var(--neon-purple);
  border: 2px solid var(--neon-purple);
}

.btn-secondary:hover {
  background: var(--neon-purple);
  color: var(--bg-primary);
  box-shadow: 0 0 20px rgba(189, 0, 255, 0.5);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

/* ===================================
   Navigation
   =================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(10, 10, 15, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 2px solid transparent;
  border-image: linear-gradient(90deg, transparent, var(--neon-cyan), var(--neon-purple), transparent) 1;
  padding: var(--spacing-md) 0;
  z-index: 1000;
  transition: all var(--transition-base);
  box-shadow: 0 0 30px rgba(0, 255, 255, 0.2);
}

.navbar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
  box-shadow: 0 0 10px var(--neon-cyan);
  animation: navGlow 3s ease-in-out infinite;
}

@keyframes navGlow {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

@keyframes menuEdgeShimmer {
  0%, 100% {
    opacity: 0.35;
    background-position: 0% 50%;
  }
  50% {
    opacity: 0.7;
    background-position: 100% 50%;
  }
}

.navbar.scrolled {
  box-shadow: 0 5px 40px rgba(0, 255, 255, 0.4), 0 0 60px rgba(189, 0, 255, 0.2);
  border-image: linear-gradient(90deg, transparent, var(--neon-green), var(--neon-cyan), transparent) 1;
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.nav-logo {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-2xl);
  font-weight: 900;
  color: var(--neon-cyan);
  text-shadow: 0 0 10px var(--neon-cyan), 0 0 20px var(--neon-cyan);
  transition: all var(--transition-base);
  position: relative;
  padding: var(--spacing-xs) var(--spacing-md);
  letter-spacing: 3px;
}


.nav-logo::before {
  content: '[ ';
  color: var(--neon-green);
  text-shadow: 0 0 10px var(--neon-green);
  position: absolute;
  left: 0;
  animation: glitchLeft 3s infinite;
}

.nav-logo::after {
  content: ' ]';
  color: var(--neon-green);
  text-shadow: 0 0 10px var(--neon-green);
  position: absolute;
  right: 0;
  animation: glitchRight 3s infinite;
}

@keyframes glitchLeft {
  0%, 100% { left: 0; opacity: 1; }
  50% { left: -3px; opacity: 0.8; }
}

@keyframes glitchRight {
  0%, 100% { right: 0; opacity: 1; }
  50% { right: -3px; opacity: 0.8; }
}

.nav-logo:hover {
  transform: scale(1.1);
  text-shadow: 0 0 20px var(--neon-cyan), 0 0 40px var(--neon-cyan), 0 0 60px var(--neon-cyan);
  color: var(--neon-green);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: linear-gradient(135deg, rgba(0, 255, 255, 0.12), rgba(189, 0, 255, 0.12));
  border: 1px solid rgba(0, 255, 255, 0.35);
  cursor: pointer;
  padding: calc(var(--spacing-sm) + 2px);
  border-radius: 16px;
  transition: all var(--transition-base);
  position: absolute;
  right: var(--container-padding);
  top: 50%;
  transform: translateY(-50%);
}

.nav-toggle:hover {
  background: linear-gradient(135deg, rgba(0, 255, 255, 0.18), rgba(189, 0, 255, 0.16));
  box-shadow: 0 0 18px rgba(0, 255, 255, 0.28), 0 0 28px rgba(189, 0, 255, 0.14);
  transform: translateY(-50%) translateY(-1px);
}

.nav-toggle span {
  width: 25px;
  height: 2px;
  background: var(--neon-cyan);
  box-shadow: 0 0 5px var(--neon-cyan);
  transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

.nav-menu {
  position: fixed;
  top: 84px;
  right: var(--container-padding);
  left: auto;
  width: min(340px, calc(100vw - 2rem));
  background: linear-gradient(180deg, rgba(12, 12, 18, 0.98), rgba(9, 9, 14, 0.94));
  backdrop-filter: blur(24px);
  flex-direction: column;
  display: flex;
  padding: 1rem;
  gap: 0.65rem;
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(0, 255, 255, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(0, 255, 255, 0.16);
  border-radius: 24px;
  transform: translateY(-12px) scale(0.98);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all var(--transition-base);
  transform-origin: top right;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
  list-style: none;
  margin: 0;
  z-index: 1000;
}

.nav-menu.active {
  transform: translateY(0) scale(1);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.nav-menu::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), var(--neon-purple), transparent);
  opacity: 0.5;
  border-radius: 24px 24px 0 0;
  background-size: 200% 100%;
  animation: menuEdgeShimmer 7s ease-in-out infinite;
}

.nav-menu::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 24px;
  padding: 1px;
  background: linear-gradient(120deg, rgba(0, 255, 255, 0.06), rgba(189, 0, 255, 0.14), rgba(0, 255, 255, 0.06));
  opacity: 0.3;
  pointer-events: none;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  animation: menuEdgeShimmer 8s ease-in-out infinite;
}

.nav-link {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: rgba(224, 224, 236, 0.86);
  text-transform: uppercase;
  letter-spacing: 1.4px;
  padding: 0.85rem 1.35rem;
  position: relative;
  transition: all var(--transition-fast);
  border-radius: 0;
  overflow: visible;
  display: block;
  text-align: center;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.nav-link::before,
.nav-link::after {
  position: absolute;
  content: '';
  pointer-events: none;
  opacity: 0;
  transition: all var(--transition-fast);
}

.nav-link::before {
  left: 50%;
  bottom: 0.15rem;
  width: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
  box-shadow: 0 0 10px rgba(0, 255, 255, 0.45);
  transform: translateX(-50%);
}

.nav-link::after {
  left: 0;
  top: 50%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(0, 255, 255, 0.75), transparent);
  box-shadow: 0 0 12px rgba(0, 255, 255, 0.35);
  transform: translateY(-50%) scaleX(0);
  transform-origin: left;
}


.nav-link:hover {
  color: #ffffff;
  text-shadow: 0 0 12px rgba(0, 255, 255, 0.7), 0 0 18px rgba(189, 0, 255, 0.32);
  transform: translateY(-1px);
}

.nav-link:hover::before,
.nav-link:hover::after,
.nav-link.active::before,
.nav-link.active::after {
  opacity: 1;
}

.nav-link:hover::before,
.nav-link.active::before {
  width: 72%;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: translateY(-50%) scaleX(1);
  animation: navScan 0.9s linear;
}

.nav-link.active {
  color: var(--neon-cyan);
  text-shadow: 0 0 10px rgba(0, 255, 255, 0.55);
}

@keyframes navScan {
  0% {
    transform: translateY(-50%) scaleX(0);
    opacity: 0;
  }
  35% {
    opacity: 1;
  }
  100% {
    transform: translateY(-50%) scaleX(1);
    opacity: 0;
  }
}

/* ===================================
   Hero Section
   =================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(70px + var(--spacing-3xl)) 0 var(--spacing-3xl);
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: 0;
}

.hero-shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.3;
  animation: float 15s infinite ease-in-out;
}

.hero-shape.shape-1 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--neon-cyan) 0%, transparent 70%);
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.hero-shape.shape-2 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--neon-purple) 0%, transparent 70%);
  bottom: 20%;
  right: 15%;
  animation-delay: 5s;
}

.hero-shape.shape-3 {
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, var(--neon-green) 0%, transparent 70%);
  top: 50%;
  right: 20%;
  animation-delay: 10s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.1); }
  66% { transform: translate(-20px, 20px) scale(0.9); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}

.hero-greeting {
  font-size: var(--font-size-lg);
  color: var(--neon-green);
  margin-bottom: var(--spacing-sm);
  text-shadow: var(--glow-green);
}

.availability-badge {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-family-heading);
  font-size: 0.68rem;
  letter-spacing: 1.3px;
  text-transform: uppercase;
  color: rgba(234, 255, 255, 0.92);
  background: linear-gradient(115deg, rgba(8, 22, 30, 0.86), rgba(18, 10, 30, 0.82));
  border: 1px solid rgba(0, 255, 255, 0.34);
  border-radius: 999px;
  padding: 0.45rem 1rem;
  backdrop-filter: blur(10px);
  box-shadow: 0 0 0 1px rgba(0, 255, 255, 0.08), 0 12px 28px rgba(0, 0, 0, 0.35), 0 0 18px rgba(0, 255, 255, 0.14);
  animation: badgeFloat 4.8s ease-in-out infinite;
}

.availability-badge::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(120deg, rgba(0, 255, 255, 0.62), rgba(189, 0, 255, 0.34), rgba(0, 255, 65, 0.48));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  opacity: 0.72;
  pointer-events: none;
  animation: badgeEdgeScan 6s linear infinite;
}

.availability-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 10px rgba(0, 255, 65, 0.8);
  animation: availabilityPulse 2.2s ease-in-out infinite;
}

.availability-badge-hero {
  margin-bottom: var(--spacing-md);
}

.availability-badge-contact {
  margin-top: var(--spacing-md);
  animation-delay: 0.8s;
}

@keyframes availabilityPulse {
  0%,
  100% {
    opacity: 0.8;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.15);
  }
}

@keyframes badgeFloat {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-4px);
  }
}

@keyframes badgeEdgeScan {
  0% {
    filter: hue-rotate(0deg);
  }
  100% {
    filter: hue-rotate(25deg);
  }
}

.hero-title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-5xl);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 0 20px rgba(0, 255, 255, 0.5);
}

.hero-subtitle {
  font-size: var(--font-size-2xl);
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
  min-height: 50px;
}

.typewriter-prefix {
  color: var(--text-secondary);
}

.typewriter {
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
}

.typewriter-cursor {
  color: var(--neon-green);
  animation: blink 1s infinite;
}

.hero-description {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.8;
}

.hero-socials {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
  margin-bottom: var(--spacing-2xl);
}

.hero-socials::-webkit-scrollbar {
  display: none;
}

.social-icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-base);
  color: var(--neon-cyan);
  border: 2px solid var(--neon-cyan);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.social-icon::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--neon-cyan);
  transform: translateY(100%);
  transition: transform var(--transition-base);
  z-index: -1;
}

.social-icon:hover {
  color: var(--bg-primary);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.5);
  transform: translateY(-3px);
}

.social-icon:hover::before {
  transform: translateY(0);
}

/* Udemy SVG Icon Styling */
.udemy-icon svg {
  width: 1.125rem;
  height: 1.125rem;
  color: inherit;
  transition: all var(--transition-base);
}

.udemy-icon:hover svg {
  filter: drop-shadow(0 0 8px currentColor);
}

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

/* ===================================
   Animations
   =================================== */

.animate-fade-up {
  animation: fadeUp 0.8s ease forwards;
  opacity: 0;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

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

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===================================
   About Section
   =================================== */

.about-main {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

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

.about-text h3 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-2xl);
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
}

.about-text p {
  font-family: var(--font-family-heading);
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-contact {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: rgba(18, 18, 26, 0.5);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.info-item:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.2);
}

.info-item i {
  font-size: var(--font-size-xl);
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
  margin-top: 2px;
}

.info-item div span {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-xs);
}

.info-item div strong {
  font-family: var(--font-family-heading);
  color: var(--text-primary);
  font-weight: 600;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.stat-card {
  padding: var(--spacing-xl);
  text-align: center;
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.3);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.stat-card:hover {
  border-color: var(--neon-green);
  box-shadow: 0 0 20px rgba(0, 255, 65, 0.3);
  transform: translateY(-5px);
}

.stat-card h4 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
  margin-bottom: var(--spacing-xs);
}

.stat-card p {
  font-family: var(--font-family-heading);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===================================
   Experience Section
   =================================== */

.timeline-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-3xl);
}

.timeline-heading {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xl);
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.timeline-heading i {
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 30px;
  bottom: 30px;
  width: 2px;
  background: linear-gradient(to bottom, var(--neon-cyan), var(--neon-purple));
  box-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
}

.timeline-item {
  padding: var(--spacing-lg);
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-md);
  margin-left: 40px;
  position: relative;
  transition: all var(--transition-base);
}

.timeline-item:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
  transform: translateX(5px);
}

.timeline-dot {
  position: absolute;
  left: -51px;
  top: 24px;
  width: 12px;
  height: 12px;
  background: var(--neon-cyan);
  border: 3px solid var(--bg-primary);
  border-radius: 50%;
  box-shadow: 0 0 15px var(--neon-cyan);
  z-index: 2;
}

.timeline-date {
  display: inline-block;
  font-size: var(--font-size-xs);
  color: var(--neon-green);
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--neon-green);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
  text-shadow: var(--glow-green);
}

.timeline-content h4 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.timeline-content p {
  font-family: var(--font-family-heading);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

/* ===================================
   Services Section
   =================================== */

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.service-card {
  padding: var(--spacing-xl);
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(0, 255, 255, 0.05),
    transparent
  );
  transition: left var(--transition-slow);
}

.service-card:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 30px rgba(0, 255, 255, 0.3);
  transform: translateY(-5px);
}

.service-card:hover::before {
  left: 100%;
}

.service-icon {
  width: 70px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-3xl);
  color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.1);
  border: 2px solid var(--neon-cyan);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  text-shadow: var(--glow-cyan);
  transition: all var(--transition-base);
}

.service-card:hover .service-icon {
  color: var(--neon-purple);
  border-color: var(--neon-purple);
  text-shadow: var(--glow-purple);
  transform: scale(1.05);
}

.service-card h3 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xl);
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.service-card p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.service-features {
  list-style: none;
  padding: 0;
  margin: 0;
}

.service-features li {
  color: var(--text-light);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xs);
  position: relative;
  padding-left: var(--spacing-lg);
}

.service-features li::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--neon-green);
  font-weight: bold;
}

.service-features li:hover {
  color: var(--text-primary);
}

/* ===================================
   Skills Section
   =================================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.skill-category {
  padding: var(--spacing-lg);
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  overflow: hidden;
  position: relative;
  animation: subtlePulse 3s ease-in-out infinite;
}

@keyframes subtlePulse {
  0%, 100% {
    box-shadow: 0 0 0 rgba(0, 255, 255, 0.2);
  }
  50% {
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.2);
  }
}

.skill-category::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--neon-cyan), var(--neon-purple));
  transform: scaleY(0);
  transition: transform var(--transition-base);
}

.skill-category:hover::before {
  transform: scaleY(1);
}

.skill-category:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 30px rgba(0, 255, 255, 0.3);
  transform: translateX(10px);
  padding-left: var(--spacing-xl);
  animation: none;
}

.skill-icon {
  width: 60px;
  height: 60px;
  min-width: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-3xl);
  color: var(--neon-cyan);
  border: 2px solid var(--neon-cyan);
  border-radius: var(--radius-md);
  text-shadow: var(--glow-cyan);
  transition: all var(--transition-base);
  background: rgba(0, 255, 255, 0.05);
}

.skill-category:hover .skill-icon {
  border-color: var(--neon-purple);
  color: var(--neon-purple);
  text-shadow: var(--glow-purple);
  transform: rotate(360deg) scale(1.05);
  box-shadow: 0 0 20px rgba(189, 0, 255, 0.5);
}

.skill-category h3 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  font-weight: 600;
  min-width: 180px;
  position: relative;
}

.skill-category h3::before {
  content: '[HOVER]';
  position: absolute;
  right: -70px;
  font-size: var(--font-size-xs);
  color: var(--text-light);
  opacity: 0.5;
  font-weight: 400;
  transition: opacity var(--transition-fast);
  letter-spacing: 1px;
}

.skill-category:hover h3::before {
  opacity: 0;
}

.skill-category h3::after {
  content: '>';
  position: absolute;
  right: -20px;
  color: var(--neon-green);
  opacity: 0;
  transition: all var(--transition-fast);
}

.skill-category:hover h3::after {
  opacity: 1;
  right: -15px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  flex: 1;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: all var(--transition-slow);
}

.skill-category:hover .skill-tags {
  max-height: 200px;
  opacity: 1;
}

.skill-tag {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  background: rgba(10, 10, 15, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  animation: fadeInTag 0.3s ease forwards;
  opacity: 0;
}

.skill-category:hover .skill-tag {
  animation-delay: calc(var(--tag-index, 0) * 0.05s);
}

.skill-tag:nth-child(1) { --tag-index: 1; }
.skill-tag:nth-child(2) { --tag-index: 2; }
.skill-tag:nth-child(3) { --tag-index: 3; }
.skill-tag:nth-child(4) { --tag-index: 4; }
.skill-tag:nth-child(5) { --tag-index: 5; }
.skill-tag:nth-child(6) { --tag-index: 6; }
.skill-tag:nth-child(7) { --tag-index: 7; }
.skill-tag:nth-child(8) { --tag-index: 8; }

@keyframes fadeInTag {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.skill-tag:hover {
  color: var(--neon-green);
  border-color: var(--neon-green);
  box-shadow: 0 0 10px rgba(0, 255, 65, 0.3);
  transform: translateY(-2px);
}

/* ===================================
   Courses Section
   =================================== */

.courses-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.courses-placeholder {
  text-align: center;
  color: var(--text-light);
  padding: var(--spacing-2xl);
}

.course-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.course-card:hover {
  border-color: var(--neon-green);
  box-shadow: 0 0 25px rgba(0, 255, 65, 0.3);
  transform: translateX(10px);
}

.course-icon {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
  border-radius: var(--radius-md);
  font-size: 2.5rem;
  color: var(--bg-primary);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.5);
  transition: all var(--transition-base);
}

.course-card:hover .course-icon {
  transform: rotate(360deg) scale(1.1);
}

.course-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.course-platform {
  display: inline-block;
  width: fit-content;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--neon-cyan);
  color: var(--bg-primary);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.course-content h3 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-base);
  font-weight: 600;
  margin: 0;
  line-height: 1.4;
  color: var(--text-primary);
}

.course-content p {
  font-family: var(--font-family-heading);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  margin: 0;
  line-height: 1.6;
}

.course-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--neon-cyan);
  transition: all var(--transition-fast);
  width: fit-content;
}

.course-link:hover {
  color: var(--neon-green);
  text-shadow: var(--glow-green);
  transform: translateX(5px);
}

.section-cta {
  margin-top: var(--spacing-xl);
  text-align: center;
}

/* ===================================
   Publications Section
   =================================== */

.publication-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.publication-stat {
  padding: var(--spacing-md);
  text-align: center;
  border: 1px solid rgba(0, 255, 255, 0.14);
  background: rgba(14, 14, 22, 0.75);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.publication-stat i {
  display: block;
  margin-bottom: var(--spacing-xs);
  color: var(--neon-cyan);
}

.publication-stat strong {
  display: block;
  font-family: var(--font-family-heading);
  font-size: var(--font-size-base);
  color: var(--text-primary);
}

.publication-stat span {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
}

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

.publication-toolbar-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.publication-toolbar-label {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.publication-sort {
  background: rgba(10, 10, 16, 0.9);
  color: var(--text-primary);
  border: 1px solid rgba(0, 255, 255, 0.24);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.75rem;
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
}

.publication-scholar-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  color: var(--neon-cyan);
}

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

.publication-item {
  display: flex;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-md);
  align-items: flex-start;
  transition: all var(--transition-base);
}

.publication-item:hover {
  border-color: var(--neon-purple);
  box-shadow: 0 0 25px rgba(189, 0, 255, 0.3);
  transform: translateX(5px);
}

.publication-year {
  min-width: 60px;
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
  padding-top: 2px;
}

.publication-details {
  flex: 1;
}

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

.publication-type,
.publication-citations {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-family: var(--font-family-heading);
  font-size: 0.68rem;
  letter-spacing: 0.6px;
  text-transform: uppercase;
}

.publication-type {
  color: var(--neon-green);
  background: rgba(0, 255, 65, 0.1);
  border: 1px solid rgba(0, 255, 65, 0.26);
}

.publication-citations {
  color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.09);
  border: 1px solid rgba(0, 255, 255, 0.22);
}

.publication-details h3 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  line-height: 1.5;
  color: var(--text-primary);
}

.publication-authors {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
}

.publication-authors strong {
  color: var(--neon-green);
  text-shadow: var(--glow-green);
}

.publication-journal {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  color: var(--text-light);
  font-style: italic;
  margin-bottom: var(--spacing-sm);
}

.publication-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: var(--spacing-sm);
}

.publication-tags span {
  font-family: var(--font-family-heading);
  font-size: 0.68rem;
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 999px;
  padding: 0.18rem 0.5rem;
}

.publication-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  color: var(--neon-cyan);
  transition: all var(--transition-fast);
}

.publication-link:hover {
  color: var(--neon-green);
  text-shadow: var(--glow-green);
  transform: translateX(3px);
}

/* ===================================
   Works Section
   =================================== */

.works-filter {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.filter-btn:hover,
.filter-btn.active {
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.3);
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.work-item {
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.work-item:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 25px rgba(0, 255, 255, 0.3);
  transform: translateY(-5px);
}

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

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

.work-item:hover .work-image img {
  transform: scale(1.1);
}

.work-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to top, rgba(10, 10, 15, 0.95), transparent);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--spacing-lg);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.work-item:hover .work-overlay {
  opacity: 1;
}

.work-category {
  font-size: var(--font-size-xs);
  color: var(--neon-green);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-xs);
  text-shadow: var(--glow-green);
}

.work-overlay h4 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.work-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--neon-cyan);
  color: var(--bg-primary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  margin-top: var(--spacing-sm);
}

.work-link:hover {
  background: var(--neon-green);
  box-shadow: 0 0 20px rgba(0, 255, 65, 0.5);
  transform: scale(1.1);
}

/* ===================================
   Blog Section
   =================================== */

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.blog-card {
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.blog-card:hover {
  border-color: var(--neon-purple);
  box-shadow: 0 0 25px rgba(189, 0, 255, 0.3);
  transform: translateY(-5px);
}

.blog-image {
  height: 200px;
  overflow: hidden;
}

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

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

.blog-content {
  padding: var(--spacing-lg);
}

.blog-content h3 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
  line-height: 1.4;
}

.blog-content h3 a {
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.blog-content h3 a:hover {
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
}

.blog-content p {
  font-family: var(--font-family-heading);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.blog-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  color: var(--neon-cyan);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.blog-link:hover {
  color: var(--neon-green);
  text-shadow: var(--glow-green);
  transform: translateX(3px);
}

/* ===================================
   Contact Section
   =================================== */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-2xl);
}

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

.contact-card {
  padding: var(--spacing-lg);
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  transition: all var(--transition-base);
}

.contact-card:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
  transform: translateX(5px);
}

.contact-icon {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  color: var(--neon-cyan);
  border: 2px solid var(--neon-cyan);
  border-radius: var(--radius-sm);
  text-shadow: var(--glow-cyan);
}

.contact-details h4 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-xs);
}

.contact-details a,
.contact-details p {
  font-family: var(--font-family-heading);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  transition: color var(--transition-fast);
}

.contact-details a:hover {
  color: var(--neon-green);
  text-shadow: var(--glow-green);
}

.contact-socials {
  padding: var(--spacing-lg);
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-md);
}

.contact-socials h4 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.social-links {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.4rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.social-links::-webkit-scrollbar {
  display: none;
}

.contact-form {
  padding: var(--spacing-xl);
  background: rgba(18, 18, 26, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-md);
}

.form-group {
  position: relative;
  margin-bottom: var(--spacing-xl);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: rgba(10, 10, 15, 0.8);
  border: 1px solid rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  outline: none;
  transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.3);
}

.form-input:focus + .form-label,
.form-input:not(:placeholder-shown) + .form-label,
.form-textarea:focus + .form-label,
.form-textarea:not(:placeholder-shown) + .form-label {
  top: -10px;
  left: var(--spacing-md);
  font-size: var(--font-size-xs);
  color: var(--neon-cyan);
  background: var(--bg-primary);
  padding: 0 var(--spacing-xs);
}

.form-label {
  position: absolute;
  top: var(--spacing-md);
  left: var(--spacing-md);
  color: var(--text-light);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  pointer-events: none;
  transition: all var(--transition-base);
}

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

/* ===================================
   Footer
   =================================== */

.footer {
  background: rgba(10, 10, 15, 0.95);
  border-top: 1px solid rgba(0, 255, 255, 0.2);
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.footer-content {
  max-width: 600px;
  margin: 0 auto;
}

.footer-logo {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-2xl);
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
}

.footer-text {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.footer-socials {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
  margin-bottom: var(--spacing-lg);
}

.footer-socials::-webkit-scrollbar {
  display: none;
}

.footer-socials .social-icon {
  width: 36px;
  height: 36px;
  font-size: var(--font-size-base);
}

.footer-copyright {
  font-size: var(--font-size-sm);
  color: var(--text-light);
}

/* ===================================
   Back to Top Button
   =================================== */

.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(18, 18, 26, 0.9);
  color: var(--neon-cyan);
  border: 2px solid var(--neon-cyan);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 999;
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
}

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

.back-to-top:hover {
  background: var(--neon-cyan);
  color: var(--bg-primary);
  box-shadow: 0 0 30px rgba(0, 255, 255, 0.5);
  transform: translateY(-3px);
}

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

@media (max-width: 1024px) {
  .about-main,
  .timeline-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .publications-grid,
  .works-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-3xl: 3rem;
  }

  .about-contact {
    grid-template-columns: 1fr;
  }

  .nav-link {
    padding: 0.85rem 1.1rem;
    text-align: center;
    width: 100%;
    border: 0;
    border-radius: 0;
    margin-bottom: 0;
    background: transparent;
  }

  .publications-grid,
  .works-grid,
  .blog-grid,
  .courses-grid {
    grid-template-columns: 1fr;
  }

  .skills-grid,
  .services-grid {
    grid-template-columns: 1fr;
  }

  .publication-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .publication-toolbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .publication-item {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .availability-badge {
    font-size: 0.66rem;
    letter-spacing: 0.9px;
    padding: 0.36rem 0.72rem;
  }

  .publication-year {
    min-width: auto;
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(0, 255, 255, 0.1);
    border: 1px solid var(--neon-cyan);
    border-radius: var(--radius-sm);
    display: inline-block;
    width: fit-content;
  }

  .timeline-grid {
    gap: var(--spacing-2xl);
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

  .back-to-top {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
  }

  .course-card {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .course-icon {
    width: 60px;
    height: 60px;
    font-size: 1.8rem;
  }

  .course-content h3 {
    font-size: var(--font-size-sm);
  }

  .course-content p {
    font-size: var(--font-size-xs);
  }

  .skill-category {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-md);
  }

  .skill-category:hover {
    transform: translateX(5px);
  }

  .skill-icon {
    width: 50px;
    height: 50px;
    min-width: 50px;
    font-size: var(--font-size-2xl);
  }

  .skill-category h3 {
    min-width: auto;
    font-size: var(--font-size-base);
  }

  .skill-category h3::before {
    display: none;
  }

  .skill-tags {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-socials {
    gap: 0.3rem;
  }

  .social-icon {
    width: 36px;
    height: 36px;
    font-size: 0.85rem;
    border-width: 1.5px;
  }

  .footer-socials .social-icon {
    width: 32px;
    height: 32px;
    font-size: 0.8rem;
  }

  .social-links {
    gap: 0.3rem;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: var(--font-size-lg);
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }

  .stat-card {
    padding: var(--spacing-lg);
  }

  .stat-card h4 {
    font-size: var(--font-size-3xl);
  }

  .works-filter {
    gap: var(--spacing-xs);
  }

  .filter-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
  }
}