/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
  /* Colors - Light Theme */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #1a1a1a;
  --text-secondary: #6c757d;
  --text-tertiary: #adb5bd;
  --accent-primary: #667eea;
  --accent-secondary: #764ba2;
  --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --border-color: #dee2e6;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Typography */
  --font-primary:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-code: "JetBrains Mono", "Fira Code", monospace;

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

[data-theme="dark"] {
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --text-primary: #f8f9fa;
  --text-secondary: #adb5bd;
  --text-tertiary: #6c757d;
  --border-color: #2a2a2a;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
}

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

/* ========================================
   Particles Background
   ======================================== */
#particles-js {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: -1;
  opacity: 0.3;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--bg-primary);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

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

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-code);
}

.logo-bracket {
  color: var(--accent-primary);
}

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

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

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: color var(--transition-base);
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition-base);
}

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

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-base);
}

.theme-toggle:hover {
  background-color: var(--bg-tertiary);
}

.sun-icon {
  display: none;
}

[data-theme="dark"] .sun-icon {
  display: block;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--text-primary);
  transition: all var(--transition-base);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  position: relative;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.typing-container {
  font-family: var(--font-code);
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

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

.cursor {
  animation: blink 1s infinite;
}

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

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
}

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

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
}

.btn {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: all var(--transition-base);
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

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

/* ========================================
   Profile Container
   ======================================== */
.profile-container {
  position: relative;
  width: 100%;
  max-width: 450px;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.profile-decoration {
  position: absolute;
  width: 100%;
  height: 100%;
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.decoration-ring {
  position: absolute;
  border-radius: 50%;
  border: 2px solid;
  opacity: 0.3;
}

.ring-1 {
  width: 100%;
  height: 100%;
  border-color: var(--accent-primary);
  animation: pulse 3s ease-in-out infinite;
}

.ring-2 {
  width: 85%;
  height: 85%;
  top: 7.5%;
  left: 7.5%;
  border-color: var(--accent-secondary);
  animation: pulse 3s ease-in-out infinite 1s;
}

.ring-3 {
  width: 70%;
  height: 70%;
  top: 15%;
  left: 15%;
  border-color: var(--accent-primary);
  animation: pulse 3s ease-in-out infinite 2s;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.3;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.5;
  }
}

.profile-image-wrapper {
  position: relative;
  width: 350px;
  height: 350px;
  border-radius: 50%;
  padding: 8px;
  background: var(--accent-gradient);
  box-shadow:
    var(--shadow-lg),
    0 0 60px rgba(102, 126, 234, 0.4);
  z-index: 1;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

.profile-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background-color: var(--bg-secondary);
  border: 4px solid var(--bg-primary);
}

.profile-badges {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.badge {
  position: absolute;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-primary);
  border: 2px solid var(--accent-primary);
  border-radius: 30px;
  box-shadow: var(--shadow-md);
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  animation: badge-float 3s ease-in-out infinite;
}

.badge-icon {
  font-size: 1.2rem;
}

.badge-1 {
  top: 10%;
  right: -10%;
  animation-delay: 0s;
}

.badge-2 {
  bottom: 20%;
  left: -15%;
  animation-delay: 1s;
}

.badge-3 {
  top: 50%;
  right: -15%;
  animation-delay: 2s;
}

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

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--text-tertiary);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* ========================================
   Sections
   ======================================== */
section {
  padding: var(--spacing-2xl) var(--spacing-lg);
  position: relative;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

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

.section-tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--accent-gradient);
  color: white;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

/* ========================================
   About Section
   ======================================== */
.about {
  background-color: var(--bg-secondary);
}

.about-intro {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

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

.highlight-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background-color: var(--bg-primary);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.highlight-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.highlight-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.highlight-content h4 {
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.highlight-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

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

.meta-item {
  padding: var(--spacing-md);
  background-color: var(--bg-primary);
  border-radius: 8px;
  border-left: 4px solid var(--accent-primary);
}

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

.about-code {
  position: sticky;
  top: 100px;
}

.code-window {
  background-color: var(--bg-primary);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
}

.window-header {
  background-color: var(--bg-tertiary);
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

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

.window-title {
  margin-left: auto;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-family: var(--font-code);
}

.window-content {
  padding: var(--spacing-lg);
  font-family: var(--font-code);
  font-size: 0.85rem;
  line-height: 1.8;
  overflow-x: auto;
}

.window-content pre {
  margin: 0;
}

.code-keyword {
  color: #c792ea;
}
.code-class {
  color: #ffcb6b;
}
.code-string {
  color: #c3e88d;
}
.code-number {
  color: #f78c6c;
}
.code-function {
  color: #82aaff;
}

/* ========================================
   Skills Section
   ======================================== */
.skills-filter {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-secondary);
  border: 2px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-base);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent-gradient);
  color: white;
  transform: translateY(-2px);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.skill-card {
  background-color: var(--bg-secondary);
  padding: var(--spacing-lg);
  border-radius: 12px;
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.skill-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

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

.skill-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.skill-name {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.skill-level {
  font-size: 0.85rem;
  color: var(--accent-primary);
  font-weight: 600;
}

.skill-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.skill-bar {
  height: 6px;
  background-color: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 3px;
  transition: width 1s ease;
  width: 0;
}

.skill-card.visible .skill-progress {
  width: var(--progress);
}

.skill-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
  margin-top: var(--spacing-sm);
}

.skill-tag {
  padding: 4px var(--spacing-xs);
  background-color: var(--bg-tertiary);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ========================================
   Experience Timeline
   ======================================== */
.timeline {
  position: relative;
  padding: var(--spacing-lg) 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent-gradient);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  margin-bottom: var(--spacing-xl);
  position: relative;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline-item:nth-child(odd) {
  flex-direction: row-reverse;
}

.timeline-content {
  width: calc(50% - var(--spacing-xl));
  padding: var(--spacing-lg);
  background-color: var(--bg-secondary);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.timeline-content:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

.timeline-marker {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 20px;
  background: var(--accent-gradient);
  border-radius: 50%;
  border: 4px solid var(--bg-primary);
  z-index: 1;
}

.timeline-date {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--accent-gradient);
  color: white;
  border-radius: 20px;
  font-size: 0.85rem;
  margin-bottom: var(--spacing-sm);
}

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

.timeline-company {
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

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

.timeline-skills {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.timeline-skill {
  padding: 4px var(--spacing-sm);
  background-color: var(--bg-tertiary);
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
  background-color: var(--bg-secondary);
}

.contact-intro {
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.social-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  max-width: 800px;
  margin: 0 auto;
}

.social-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background-color: var(--bg-primary);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-base);
  border: 2px solid transparent;
}

.social-link:hover {
  transform: translateY(-5px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

.social-link svg {
  flex-shrink: 0;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background-color: var(--bg-tertiary);
  padding: var(--spacing-lg);
  text-align: center;
}

.footer-content {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  color: var(--text-secondary);
}

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

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 968px) {
  .hero-content {
    grid-template-columns: 1fr;
  }

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

  .about-code {
    position: static;
    order: -1;
  }

  .hero-visual {
    order: -1;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .profile-container {
    max-width: 350px;
  }

  .profile-image-wrapper {
    width: 280px;
    height: 280px;
  }

  .badge {
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
  }

  .badge-1,
  .badge-2,
  .badge-3 {
    position: static;
    margin-bottom: var(--spacing-sm);
  }

  .timeline::before {
    left: 30px;
  }

  .timeline-item {
    flex-direction: row !important;
  }

  .timeline-content {
    width: calc(100% - 80px);
    margin-left: 80px;
  }

  .timeline-marker {
    left: 30px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: var(--bg-primary);
    flex-direction: column;
    padding: var(--spacing-xl);
    transition: left var(--transition-base);
    border-right: 1px solid var(--border-color);
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-stats {
    flex-wrap: wrap;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .profile-container {
    max-width: 280px;
  }

  .profile-image-wrapper {
    width: 220px;
    height: 220px;
  }

  .profile-badges {
    position: static;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
  }

  .badge {
    position: static !important;
  }

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

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

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .stat-number {
    font-size: 2rem;
  }
}