/* ===================================
   CSS Variables - Design System
   =================================== */
:root {
  /* Color Palette */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-card: rgba(18, 18, 26, 0.6);
  --color-bg-card-hover: rgba(25, 25, 35, 0.8);

  /* Accent Colors */
  --color-accent-blue: #3b82f6;
  --color-accent-cyan: #06b6d4;
  --color-accent-electric: #60a5fa;

  /* Text Colors */
  --color-text-primary: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;

  /* Glow Effects */
  --glow-blue: 0 0 20px rgba(59, 130, 246, 0.5);
  --glow-cyan: 0 0 20px rgba(6, 182, 212, 0.5);
  --glow-blue-strong: 0 0 30px rgba(59, 130, 246, 0.8), 0 0 60px rgba(59, 130, 246, 0.4);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;

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

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
}

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: var(--spacing-sm);
}

p {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

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

a:hover {
  color: var(--color-accent-cyan);
}

/* ===================================
   Layout Components
   =================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-cyan));
  margin: var(--spacing-sm) auto 0;
  border-radius: 2px;
  box-shadow: var(--glow-blue);
}

/* ===================================
   Navigation
   =================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(59, 130, 246, 0.1);
  padding: var(--spacing-sm) 0;
  transition: background var(--transition-normal);
}

.nav.scrolled {
  background: rgba(10, 10, 15, 0.95);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.nav-logo span {
  color: var(--color-accent-blue);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--color-accent-blue);
  background: rgba(59, 130, 246, 0.1);
}

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

/* Mobile Menu Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
}

.hero-background::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.1) 0%, transparent 70%);
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.5;
  }

  50% {
    transform: translate(-50%, -50%) scale(1.2);
    opacity: 0.8;
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-accent-cyan);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

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

.hero-description {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

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

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-cyan));
  color: var(--color-text-primary);
  box-shadow: var(--glow-blue);
}

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

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-accent-blue);
}

.btn-secondary:hover {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--color-accent-cyan);
  box-shadow: var(--glow-blue);
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

/* ===================================
   Cards
   =================================== */
.card {
  background: var(--color-bg-card);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-cyan));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-accent-blue);
  box-shadow: var(--glow-blue);
  transform: translateY(-5px);
}

.card:hover::before {
  opacity: 1;
}

.card-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.card-text {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

/* ===================================
   About Section
   =================================== */
.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-icon {
  width: 100px;
  height: 100px;
  margin: 0 auto 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.4);
  transition: all var(--transition-normal);
}

.about-icon img {
  width: 70px;
  height: 70px;
  filter: drop-shadow(0 0 12px rgba(59, 130, 246, 0.6));
}

.about-text {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);

    text-align: justify;}

/* ===================================
   Skills Section
   =================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.skill-category {
  background: var(--color-bg-card);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
}

.skill-category:hover {
  border-color: var(--color-accent-blue);
  box-shadow: var(--glow-blue);
  transform: translateY(-5px);
}

.skill-category-title {
  font-size: 1.25rem;
  color: var(--color-accent-cyan);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

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

.skill-tag {
  background: rgba(59, 130, 246, 0.1);
  color: var(--color-text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  border: 1px solid rgba(59, 130, 246, 0.3);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  background: rgba(59, 130, 246, 0.2);
  color: var(--color-accent-cyan);
  border-color: var(--color-accent-cyan);
}

/* ===================================
   Projects Section
   =================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.project-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-cyan));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.project-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-accent-blue);
  box-shadow: var(--glow-blue);
  transform: translateY(-8px);
}

.project-card:hover::before {
  opacity: 1;
}

.project-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
  transition: all var(--transition-normal);
}

.project-icon img {
  width: 60px;
  height: 60px;
  filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.5));
  transition: all var(--transition-normal);
}

.project-card:hover .project-icon {
  transform: scale(1.1);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.5);
}

.project-card:hover .project-icon img {
  filter: drop-shadow(0 0 15px rgba(59, 130, 246, 0.7));
}

.project-header {
  margin-bottom: var(--spacing-sm);
}

.project-title {
  font-size: 1.5rem;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.project-problem {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: var(--spacing-sm);
}

.project-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  flex-grow: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.tech-tag {
  background: rgba(6, 182, 212, 0.1);
  color: var(--color-accent-cyan);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.project-outcome {
  background: rgba(59, 130, 246, 0.05);
  border-left: 3px solid var(--color-accent-blue);
  padding: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.project-outcome-label {
  font-size: 0.75rem;
  color: var(--color-accent-blue);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.project-outcome-text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0;
}

.project-links {
  display: flex;
  gap: var(--spacing-sm);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-accent-blue);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.project-link:hover {
  color: var(--color-accent-cyan);
  transform: translateX(3px);
}

/* ===================================
   ML Mindset Section
   =================================== */
.mindset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.mindset-item {
  background: var(--color-bg-card);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  position: relative;
}

.mindset-item::before {
  content: '';
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-cyan));
  border-radius: 50%;
  opacity: 0.1;
  transition: all var(--transition-normal);
}

.mindset-item:hover {
  border-color: var(--color-accent-blue);
  box-shadow: var(--glow-blue);
  transform: translateY(-5px);
}

.mindset-item:hover::before {
  opacity: 0.2;
  transform: scale(1.2);
}

.mindset-title {
  font-size: 1.125rem;
  color: var(--color-accent-cyan);
  margin-bottom: var(--spacing-xs);
  position: relative;
  z-index: 1;
}

.mindset-description {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin: 0;
}

/* ===================================
   Experience Section
   =================================== */
.timeline {
  max-width: 800px;
  margin: var(--spacing-lg) auto 0;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent-blue), var(--color-accent-cyan));
  opacity: 0.3;
}

.timeline-item {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 0;
  width: 14px;
  height: 14px;
  background: var(--color-accent-blue);
  border-radius: 50%;
  box-shadow: var(--glow-blue);
}

.timeline-icon {
  width: 60px;
  height: 60px;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
  transition: all var(--transition-normal);
}

.timeline-icon img {
  width: 40px;
  height: 40px;
  filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.5));
}

.timeline-item:hover .timeline-icon {
  transform: scale(1.1);
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.5);
}

.timeline-header {
  margin-bottom: var(--spacing-sm);
}

.timeline-title {
  font-size: 1.25rem;
  color: var(--color-text-primary);
  margin-bottom: 0.25rem;
}

.timeline-meta {
  font-size: 0.875rem;
  color: var(--color-accent-cyan);
  font-weight: 600;
}

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

.timeline-description ul {
  margin-top: var(--spacing-xs);
  padding-left: var(--spacing-md);
}

.timeline-description li {
  margin-bottom: 0.5rem;
  color: var(--color-text-secondary);
}

/* ===================================
   Contact Section
   =================================== */
.contact-content {
  max-width: 600px;
  margin: 0 auto;
}

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

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--color-bg-card);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.contact-item:hover {
  border-color: var(--color-accent-blue);
  box-shadow: var(--glow-blue);
}

.contact-icon {
  width: 24px;
  height: 24px;
  color: var(--color-accent-cyan);
}

.contact-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

/* ===================================
   Footer
   =================================== */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid rgba(59, 130, 246, 0.1);
  padding: var(--spacing-md) 0;
  text-align: center;
}

.footer-text {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin: 0;
}

/* ===================================
   Animations
   =================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.98);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition-normal);
    border-bottom: 1px solid rgba(59, 130, 246, 0.2);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

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

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }

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

  .timeline::before {
    left: 0;
  }

  .timeline-item {
    padding-left: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }

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

  .card,
  .project-card,
  .skill-category,
  .mindset-item {
    padding: var(--spacing-sm);
  }
}

/* ===================================
   Utility Classes
   =================================== */
.text-center {
  text-align: center;
}

.text-gradient {
  background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glow {
  box-shadow: var(--glow-blue);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}