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

:root {
  --terminal-green: #39ff14;
  --terminal-dark: #0a0a0a;
  --accent: #6366f1;
  --accent-hover: #4338ca;
  --bg-primary: #fafafa;
  --bg-secondary: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --border-color: #e5e7eb;
  
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
  
  --section-padding: 5rem 0;
  --container-max-width: 1152px;
  
  --transition-default: all 0.3s ease;
  --transition-fast: all 0.2s ease;
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --border-color: #334155;
  --terminal-green: #22c55e;
  --accent: #8b5cf6;
  --accent-hover: #7c3aed;
}

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

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.font-mono {
  font-family: var(--font-mono);
}

.text-terminal-green {
  color: var(--terminal-green);
}

.bg-terminal-dark {
  background-color: var(--terminal-dark);
}

.text-accent {
  color: var(--accent);
}

.bg-accent {
  background-color: var(--accent);
}

.bg-accent:hover {
  background-color: var(--accent-hover);
}

/* Custom Components */
.terminal-block {
  background-color: var(--terminal-dark);
  color: var(--terminal-green);
  padding: 1.5rem;
  border-radius: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-family: var(--font-mono);
  font-weight: 500;
  transition: var(--transition-fast);
}

.skill-tag.ruby {
  background-color: #fee2e2;
  color: #991b1b;
}

.skill-tag.blue {
  background-color: #dbeafe;
  color: #1e40af;
}

.skill-tag.green {
  background-color: #dcfce7;
  color: #166534;
}

.skill-tag.yellow {
  background-color: #fef3c7;
  color: #92400e;
}

.skill-tag.purple {
  background-color: #ede9fe;
  color: #6b21a8;
}

.skill-tag.cyan {
  background-color: #cffafe;
  color: #0f766e;
}

/* Dark theme support for skill tags */
[data-theme="dark"] .skill-tag.ruby {
  background-color: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
}

[data-theme="dark"] .skill-tag.blue {
  background-color: rgba(59, 130, 246, 0.2);
  color: #93c5fd;
}

[data-theme="dark"] .skill-tag.green {
  background-color: rgba(34, 197, 94, 0.2);
  color: #86efac;
}

[data-theme="dark"] .skill-tag.yellow {
  background-color: rgba(251, 191, 36, 0.2);
  color: #fde047;
}

[data-theme="dark"] .skill-tag.purple {
  background-color: rgba(147, 51, 234, 0.2);
  color: #c4b5fd;
}

[data-theme="dark"] .skill-tag.cyan {
  background-color: rgba(6, 182, 212, 0.2);
  color: #67e8f9;
}

/* Navigation */
nav {
  background-color: var(--bg-secondary) !important;
  border-color: var(--border-color) !important;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.nav-link {
  position: relative;
  color: var(--text-secondary);
  transition: var(--transition-default);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: width 0.3s ease;
}

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

/* Theme Switcher */
#theme-toggle {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: white;
  border: none;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
  transform: scale(1);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

#theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

#theme-toggle:active {
  transform: scale(0.95);
}

#theme-toggle::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transition: all 0.4s ease;
  transform: translate(-50%, -50%);
}

#theme-toggle:hover::before {
  width: 100px;
  height: 100px;
}

.theme-icon-light,
.theme-icon-dark {
  transition: all 0.3s ease;
  position: relative;
  z-index: 1;
}

[data-theme="dark"] #theme-toggle {
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

[data-theme="dark"] #theme-toggle:hover {
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

[data-theme="dark"] .theme-icon-light {
  display: none;
}

[data-theme="dark"] .theme-icon-dark {
  display: inline !important;
}

/* Language Switcher */
.lang-switcher {
  position: relative;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  padding: 4px;
  display: flex;
  gap: 2px;
  overflow: hidden;
}

.lang-btn {
  position: relative;
  padding: 8px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 2;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}


.lang-btn.active {
  color: white;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.lang-btn:not(.active) {
  color: var(--text-secondary);
}

.lang-btn:not(.active):hover {
  color: var(--text-primary);
}

.lang-indicator {
  position: absolute;
  top: 4px;
  left: 4px;
  width: calc(50% - 2px);
  height: calc(100% - 8px);
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border-radius: 8px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.lang-switcher[data-active="en"] .lang-indicator {
  transform: translateX(100%);
}

[data-theme="dark"] .lang-indicator {
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

/* Cards */
.card {
  background: var(--bg-secondary);
  border-radius: 0.5rem;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  transition: var(--transition-default);
  border: 1px solid var(--border-color);
}

.card:hover {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.credentials-card {
  background: var(--bg-secondary);
  border-radius: 0.5rem;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  padding: 2rem;
  text-align: center;
  transition: var(--transition-default);
  border: 1px solid var(--border-color);
}

.credentials-card:hover {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.credential-icon {
  width: 5rem;
  height: 5rem;
  margin: 0 auto 1rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.credential-icon.ieee {
  background-color: #dbeafe;
  color: #2563eb;
}

.credential-icon.raptors {
  background-color: #dcfce7;
  color: #16a34a;
}

/* Social Links */
.social-link {
  background: #1f2937;
  border-radius: 0.5rem;
  padding: 1.5rem;
  transition: var(--transition-default);
  text-align: center;
  color: white;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 120px;
}

.social-link:hover {
  transform: translateY(-2px);
  color: white;
}

.social-link.github:hover {
  background-color: #374151;
}

.social-link.github i:hover {
  color: var(--terminal-green);
}

.social-link.linkedin:hover {
  background-color: #2563eb;
}

.social-link.researchgate:hover {
  background-color: #0891b2;
}

.social-link.instagram:hover {
  background-color: #ec4899;
}

.social-link.telegram:hover {
  background-color: #3b82f6;
}

.social-link.email:hover {
  background-color: #ef4444;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: 0.5rem;
  max-width: 32rem;
  width: 100%;
  max-height: 90vh;
  overflow: auto;
  border: 1px solid var(--border-color);
}

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

.modal-close {
  color: #9ca3af;
  font-size: 1.5rem;
  line-height: 1;
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-fast);
}

.modal-close:hover {
  color: #6b7280;
}

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes typewriter {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}

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

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes pulse-accent {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.4);
  }
  50% {
    box-shadow: 0 0 0 20px rgba(99, 102, 241, 0);
  }
}

@keyframes matrix-rain {
  0% {
    transform: translateY(-100vh);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh);
    opacity: 0;
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

.slide-in-right {
  animation: slideInRight 0.6s ease-out;
}

.scale-in {
  animation: scaleIn 0.5s ease-out;
}

.typewriter {
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid var(--terminal-green);
  animation: typewriter 2s steps(40, end), blink 1s infinite;
}

.float {
  animation: float 3s ease-in-out infinite;
}

.pulse-accent {
  animation: pulse-accent 2s infinite;
}

/* Staggered animation delays */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

/* Developer-style Creative Elements */
.code-brackets::before {
  content: '{ ';
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: bold;
}

.code-brackets::after {
  content: ' }';
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: bold;
}

.matrix-bg {
  position: relative;
  overflow: hidden;
}

.matrix-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(57, 255, 20, 0.05) 0%, transparent 50%);
  animation: matrix-rain 20s linear infinite;
  pointer-events: none;
}

.glitch {
  position: relative;
  display: inline-block;
}

.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.glitch::before {
  animation: glitch-1 2s infinite;
  color: #ff0000;
  z-index: -1;
}

.glitch::after {
  animation: glitch-2 2s infinite;
  color: #00ffff;
  z-index: -2;
}

@keyframes glitch-1 {
  0%, 14%, 15%, 49%, 50%, 99%, 100% {
    transform: translate(0);
  }
  15%, 49% {
    transform: translate(-2px, -1px);
  }
}

@keyframes glitch-2 {
  0%, 20%, 21%, 62%, 63%, 99%, 100% {
    transform: translate(0);
  }
  21%, 62% {
    transform: translate(2px, 1px);
  }
}

.terminal-cursor::after {
  content: '█';
  color: var(--terminal-green);
  animation: blink 1s infinite;
}

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

.terminal-cursor-static {
  color: var(--terminal-green);
  opacity: 0.7;
}

.terminal-output {
  position: relative;
}

#terminal-text {
  overflow: hidden;
  white-space: nowrap;
  animation: typewriter-slow 4s steps(60, end) forwards;
  max-width: 0;
}

@media (max-width: 768px) {
  #terminal-text {
    white-space: normal;
    word-break: break-word;
    animation: typewriter-mobile 4s steps(60, end) forwards;
  }
}

@keyframes typewriter-mobile {
  from {
    max-width: 0;
  }
  to {
    max-width: 100%;
  }
}

@keyframes typewriter-slow {
  from {
    max-width: 0;
  }
  to {
    max-width: 100%;
  }
}

.syntax-highlight .keyword {
  color: #ff79c6;
  font-weight: 600;
}

.syntax-highlight .string {
  color: #f1fa8c;
}

.syntax-highlight .comment {
  color: #6272a4;
  font-style: italic;
}

.syntax-highlight .function {
  color: #50fa7b;
}

.syntax-highlight .variable {
  color: #8be9fd;
}

/* Holographic effect for cards */
.holographic {
  position: relative;
  background: linear-gradient(45deg, 
    rgba(99, 102, 241, 0.1),
    rgba(139, 92, 246, 0.1),
    rgba(99, 102, 241, 0.1)
  );
  background-size: 400% 400%;
  animation: holographic-shift 10s ease infinite;
}

@keyframes holographic-shift {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.holographic::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.1) 50%,
    transparent 100%
  );
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.holographic:hover::before {
  transform: translateX(100%);
}

/* Neon glow effects */
.neon-text {
  text-shadow: 
    0 0 5px var(--accent),
    0 0 10px var(--accent),
    0 0 15px var(--accent),
    0 0 20px var(--accent);
}

.neon-border {
  border: 2px solid var(--accent);
  box-shadow: 
    0 0 5px var(--accent),
    inset 0 0 5px var(--accent);
}

/* Code window styling */
.code-window {
  background: var(--terminal-dark);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.code-window-header {
  background: #21252b;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-window-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27ca3f; }

/* Enhanced skill tags with programmer theme */
.skill-tag {
  position: relative;
  overflow: hidden;
  border: 1px solid currentColor;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.skill-tag::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.skill-tag:hover::before {
  left: 100%;
}

.skill-tag.ruby {
  border-color: #cc342d;
  color: #cc342d;
  background: rgba(204, 52, 45, 0.1);
}

.skill-tag.blue {
  border-color: #2563eb;
  color: #2563eb;
  background: rgba(37, 99, 235, 0.1);
}

.skill-tag.green {
  border-color: #16a34a;
  color: #16a34a;
  background: rgba(22, 163, 74, 0.1);
}

.skill-tag.yellow {
  border-color: #ca8a04;
  color: #ca8a04;
  background: rgba(202, 138, 4, 0.1);
}

.skill-tag.purple {
  border-color: #7c3aed;
  color: #7c3aed;
  background: rgba(124, 58, 237, 0.1);
}

/* Utility Classes */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding {
  padding: var(--section-padding);
}

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

.transition {
  transition: var(--transition-default);
}

.transition-fast {
  transition: var(--transition-fast);
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --section-padding: 3rem 0;
  }
  
  .credentials-card {
    padding: 1.5rem;
  }
  
  .social-link {
    padding: 1rem;
  }
}

/* Print Styles */
@media print {
  .nav-link::after,
  .social-link:hover,
  .card:hover {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
}

/* SVG Logo Color Adaptation */
.logo-light {
  filter: brightness(0) saturate(100%) invert(12%) sepia(7%) saturate(1156%) hue-rotate(199deg) brightness(96%) contrast(92%);
  transition: filter 0.3s ease;
}

.logo-dark {
  filter: brightness(0) saturate(100%) invert(89%) sepia(4%) saturate(458%) hue-rotate(192deg) brightness(107%) contrast(95%);
  transition: filter 0.3s ease;
}

/* Footer logo should always be light since footer is dark */
footer .logo-light {
  filter: brightness(0) saturate(100%) invert(89%) sepia(4%) saturate(458%) hue-rotate(192deg) brightness(107%) contrast(95%);
}

footer .logo-dark {
  filter: brightness(0) saturate(100%) invert(89%) sepia(4%) saturate(458%) hue-rotate(192deg) brightness(107%) contrast(95%);
}

[data-theme="dark"] .logo-light {
  display: none;
}

[data-theme="dark"] .logo-dark {
  display: block !important;
}

/* But in footer, always show light version */
footer [data-theme="dark"] .logo-light {
  display: block !important;
}

footer [data-theme="dark"] .logo-dark {
  display: none;
}

/* Sections Background Adaptation */
#about {
  background-color: var(--bg-secondary) !important;
}

#projects {
  background-color: var(--bg-primary) !important;
}

#services {
  background-color: var(--bg-secondary) !important;
}

#credentials {
  background-color: var(--bg-primary) !important;
}

footer {
  background-color: var(--terminal-dark) !important;
}

/* Additional Dark Theme Adjustments */
[data-theme="dark"] .bg-gray-50 {
  background-color: var(--bg-primary) !important;
}

[data-theme="dark"] .bg-white {
  background-color: var(--bg-secondary) !important;
}

[data-theme="dark"] .text-gray-600 {
  color: var(--text-secondary) !important;
}

[data-theme="dark"] .text-gray-900 {
  color: var(--text-primary) !important;
}

/* Academic Publications Links Dark Theme */
[data-theme="dark"] .bg-purple-50 {
  background-color: rgba(139, 92, 246, 0.1) !important;
}

[data-theme="dark"] .bg-purple-50:hover,
[data-theme="dark"] .hover\:bg-purple-100:hover {
  background-color: rgba(139, 92, 246, 0.2) !important;
}

[data-theme="dark"] .text-purple-800 {
  color: #a78bfa !important;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus Styles for Accessibility */
.lang-btn:focus,
.nav-link:focus,
.social-link:focus,
.modal-close:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}