/* ===== CSS Variables & Design Tokens ===== */
:root {
  /* Light Theme Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-accent: rgba(99, 102, 241, 0.05);
  --text-primary: #1a1a1a;
  --text-secondary: #4a5568;
  --text-accent: #6366f1;
  --border-color: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-accent: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-tech: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

  /* 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-mono: 'JetBrains Mono', 'Fira Code', monospace;

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

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Colors */
[data-theme="dark"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-accent: rgba(99, 102, 241, 0.1);
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-accent: #818cf8;
  --border-color: rgba(255, 255, 255, 0.1);
  --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);
}

/* ===== 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(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

/* ===== 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);
  margin-bottom: var(--spacing-md);
}

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 {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
  font-size: 1.125rem;
}

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

a:hover {
  opacity: 0.8;
}

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

section {
  padding: var(--spacing-2xl) 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

/* ===== Theme Toggle Button ===== */
.theme-toggle {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 1000;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
}

.theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

.theme-toggle svg {
  width: 24px;
  height: 24px;
  fill: var(--text-primary);
  transition: transform var(--transition-base);
}

.theme-toggle:hover svg {
  transform: rotate(15deg);
}

/* ===== Navigation Bar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1001;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
  background: rgba(10, 10, 10, 0.8);
}

.navbar-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.navbar-logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

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

.navbar-link {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

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

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

.navbar-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background: var(--text-accent);
  border-radius: var(--radius-full);
}

/* Mobile Menu Toggle */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.navbar-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.navbar-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

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

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

/* ===== Fixed Social Icons ===== */
.social-sidebar {
  position: fixed;
  left: var(--spacing-lg);
  top: 60%;
  transform: translateY(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.social-icon {
  width: 40px;
  height: 40px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.social-icon::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.social-icon:hover::before {
  opacity: 0.1;
}

.social-icon:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-color: var(--text-accent);
}

.social-icon svg {
  width: 20px;
  height: 20px;
  fill: var(--text-primary);
  position: relative;
  z-index: 1;
  transition: fill var(--transition-fast);
}

.social-icon:hover svg {
  fill: var(--text-accent);
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-title {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
  animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-description {
  max-width: 600px;
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* Animated Background Grid */
.hero-bg {
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image:
    linear-gradient(var(--text-accent) 1px, transparent 1px),
    linear-gradient(90deg, var(--text-accent) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
  0% {
    transform: translate(0, 0);
  }

  100% {
    transform: translate(50px, 50px);
  }
}

/* Floating Orbs */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.15;
  animation: float 20s ease-in-out infinite;
  pointer-events: none;
}

.orb-1 {
  width: 300px;
  height: 300px;
  background: var(--gradient-primary);
  top: 10%;
  right: 10%;
  animation-delay: 0s;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: var(--gradient-tech);
  bottom: 10%;
  left: 10%;
  animation-delay: 5s;
}

@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);
  }
}

/* ===== CTA Buttons ===== */
.cta-group {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

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

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

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

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--text-accent);
  background: var(--bg-accent);
}

/* ===== Section Headers ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title {
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

/* ===== Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--text-accent);
}

.card:hover::before {
  opacity: 0.05;
}

.card-content {
  position: relative;
  z-index: 1;
}

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

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

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.card-icon svg {
  width: 24px;
  height: 24px;
  fill: white;
}

/* ===== Skills/Tags ===== */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
}

.tag {
  padding: 0.5rem 1rem;
  background: var(--bg-accent);
  color: var(--text-accent);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.tag:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

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

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

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

/* ===== Responsive Design ===== */
@media (max-width: 768px) {

  /* Hide social sidebar on mobile */
  .social-sidebar {
    display: none;
  }

  /* Adjust theme toggle for navbar */
  .theme-toggle {
    position: relative;
    top: auto;
    right: auto;
    width: 40px;
    height: 40px;
    margin-left: var(--spacing-sm);
  }

  .theme-toggle svg {
    width: 20px;
    height: 20px;
  }

  /* Mobile Navigation */
  .navbar-container {
    padding: 0 var(--spacing-md);
  }

  .navbar-toggle {
    display: flex;
  }

  .navbar-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    gap: 0;
    padding: var(--spacing-md) 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
  }

  .navbar-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .navbar-link {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 0;
  }

  .navbar-link.active::after {
    display: none;
  }

  section {
    min-height: auto;
    padding: var(--spacing-xl) 0;
  }

  .hero {
    padding-top: 70px;
  }

  .cta-group {
    flex-direction: column;
  }

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

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

/* Desktop: Move theme toggle into navbar */
@media (min-width: 769px) {
  .theme-toggle {
    position: relative;
    top: auto;
    right: auto;
    margin-left: var(--spacing-md);
  }

  body {
    padding-top: 70px;
  }
}

/* ===== Contact Section ===== */
#contact {
  padding-bottom: var(--spacing-2xl);
}

/* ===== Utility Classes ===== */
.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

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

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

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

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

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

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

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

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