/* ============================================
   DESIGN SYSTEM & CSS VARIABLES
   ============================================ */
:root {
  /* Color Palette - Vibrant & Professional */
  --color-bg-primary: #0a0e27;
  --color-bg-secondary: #141933;
  --color-bg-tertiary: #1e2442;
  --color-accent-primary: #6366f1;
  --color-accent-secondary: #8b5cf6;
  --color-accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --color-text-primary: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  /* Glassmorphism */
  --glass-bg: rgba(30, 36, 66, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Playfair Display', Georgia, 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: 3rem;
  --font-size-6xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;

  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-tooltip: 1050;
}

/* ============================================
   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: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Animated Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 80%, rgba(99, 102, 241, 0.05) 0%, transparent 50%);
  z-index: -1;
  animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.8;
    transform: scale(1.1);
  }
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-5xl);
  font-family: var(--font-display);
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: var(--font-size-4xl);
  font-family: var(--font-display);
}

h3 {
  font-size: var(--font-size-3xl);
}

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

/* ============================================
   UTILITIES
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  outline: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.1);
  transition: left var(--transition-base);
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--color-accent-gradient);
  color: #ffffff !important;
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 40px rgba(99, 102, 241, 0.4);
}

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

.btn-outline:hover {
  background: var(--color-accent-primary);
  color: white;
  transform: translateY(-2px);
}

.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-2xl);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--color-accent-gradient);
  margin: var(--space-md) auto 0;
  border-radius: var(--radius-full);
}

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

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

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-fixed);
  padding: var(--space-md) 0;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

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

.logo {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
  align-items: center;
}

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  position: relative;
  padding: var(--space-xs) 0;
  transition: color var(--transition-base);
}

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

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

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

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  padding: var(--space-xs);
}

.menu-toggle span {
  display: block;
  width: 28px;
  height: 3px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding-top: 80px;
}

.hero-content {
  max-width: 900px;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-accent-primary);
  font-weight: 600;
  margin-bottom: var(--space-md);
  display: block;
  animation: fadeInDown 0.8s ease-out;
}

.hero h1 {
  margin-bottom: var(--space-md);
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero-description {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.hero-contact-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.5s backwards;
}

.hero-contact-info a {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  transition: color var(--transition-base);
}

.hero-contact-info a:hover {
  color: var(--color-accent-primary);
}

.hero-contact-info .separator {
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

.hero-socials {
  animation: fadeInUp 0.8s ease-out 0.8s backwards;
  justify-content: center;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-indicator::before {
  content: '↓';
  font-size: var(--font-size-3xl);
  color: var(--color-accent-primary);
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {

  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateX(-50%) translateY(0);
  }

  40% {
    transform: translateX(-50%) translateY(-20px);
  }

  60% {
    transform: translateX(-50%) translateY(-10px);
  }
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-content {
  max-width: 900px;
  margin: 0 auto;
}

.about-image {
  position: relative;
}

.about-image-wrapper {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.about-image-wrapper::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: var(--color-accent-gradient);
  border-radius: var(--radius-2xl);
  z-index: -1;
}

.about-image img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-2xl);
}

.about-text h2 {
  margin-bottom: var(--space-md);
}

.about-text p {
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.skills-extended-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.skill-card {
  padding: var(--space-lg);
  border-radius: var(--radius-xl);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: all var(--transition-base);
}

.skill-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent-primary);
  box-shadow: 0 10px 40px rgba(99, 102, 241, 0.15);
}

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

.skill-icon-large {
  font-size: 2.5rem;
  color: var(--color-accent-primary);
  background: rgba(99, 102, 241, 0.1);
  padding: 15px;
  border-radius: var(--radius-lg);
}

.skill-card h3 {
  font-size: var(--font-size-xl);
  margin: 0;
}

.skill-card p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.skill-tags-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-pill {
  font-size: var(--font-size-sm);
  color: var(--color-accent-secondary);
  background: rgba(255, 255, 255, 0.05);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.project-card {
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  background: var(--color-bg-secondary);
  border: 1px solid transparent;
}

.project-card:hover {
  transform: translateY(-10px);
  border-color: var(--color-accent-primary);
  box-shadow: 0 20px 60px rgba(99, 102, 241, 0.2);
}

.project-image {
  position: relative;
  overflow: hidden;
  height: 250px;
  background: var(--color-bg-tertiary);
}

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

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

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(99, 102, 241, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.project-link {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: white;
  color: var(--color-accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  transition: all var(--transition-base);
}

.project-link:hover {
  transform: scale(1.1) rotate(5deg);
}

.project-content {
  padding: var(--space-lg);
}

.project-title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.project-description {
  margin-bottom: var(--space-md);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag {
  padding: var(--space-xs) var(--space-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-accent-primary);
}

/* ============================================
   EXPERIENCE SECTION
   ============================================ */
.timeline {
  position: relative;
  max-width: 800px;
  margin: var(--space-xl) auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background: var(--color-accent-gradient);
}

.timeline-item {
  margin-bottom: var(--space-2xl);
  position: relative;
  padding-top: 80px;
}

.timeline-item:nth-child(odd) .timeline-content {
  margin-left: auto;
}

.timeline-content {
  width: calc(50% - var(--space-xl));
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  position: relative;
  margin-top: var(--space-2xl);
}

.timeline-date {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent-gradient);
  color: white;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
}

.timeline-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

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

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-container {
  max-width: 800px;
  margin: 0 auto;
}

.contact-form {
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border: 2px solid var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.social-link {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 2px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  color: var(--color-text-primary);
  transition: all var(--transition-base);
}

.social-link:hover {
  background: var(--color-accent-gradient);
  border-color: transparent;
  transform: translateY(-5px) rotate(5deg);
  color: white;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  padding: var(--space-xl) 0;
  text-align: center;
  border-top: 1px solid var(--glass-border);
  background: var(--color-bg-secondary);
}

.footer p {
  margin: 0;
  color: var(--color-text-muted);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    flex-direction: column;
    justify-content: center;
    padding: var(--space-xl);
    transition: right var(--transition-base);
    border-left: 1px solid var(--glass-border);
  }

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

  .menu-toggle {
    display: flex;
    z-index: var(--z-modal);
  }

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

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

  .menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
  }

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

  .skills-extended-grid {
    gap: var(--space-lg);
  }

  .projects-grid {
    gap: var(--space-lg);
  }

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

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

  .timeline-date {
    left: 30px;
    transform: translateX(-50%);
  }

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

  .hero-cta .btn {
    width: 100%;
  }
}

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

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

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

  .hero-content h1 {
    font-size: var(--font-size-4xl);
  }
}