/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --secondary-color: #f59e0b;
  --accent-color: #10b981;
  
  /* Neutral Colors */
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Background */
  --bg-primary: var(--white);
  --bg-secondary: var(--gray-50);
  --bg-dark: var(--gray-900);
  
  /* Text */
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-600);
  --text-light: var(--gray-400);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-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: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* ===== RESET & BASE ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

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

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

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

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

a:hover {
  color: var(--primary-dark);
}

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

.main-content {
  min-height: 100vh;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: 500;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--white);
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 2px solid var(--gray-300);
}

.btn-secondary:hover {
  background-color: var(--gray-100);
  color: var(--text-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

/* ===== NAVIGATION ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
  z-index: 1000;
  transition: all var(--transition-normal);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.nav-brand {
  display: flex;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
}

.nav-logo i {
  color: var(--primary-color);
  font-size: var(--font-size-xl);
}

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

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

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width var(--transition-fast);
}

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

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

.bar {
  width: 24px;
  height: 3px;
  background-color: var(--text-primary);
  margin: 3px 0;
  transition: var(--transition-fast);
}

/* ===== HERO SECTION ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--gray-50) 100%);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.hero-particles {
  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(245, 158, 11, 0.1) 0%, transparent 50%),
                    radial-gradient(circle at 40% 40%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
  width: 100%;
}

.hero-text {
  animation: fadeInUp 1s ease-out;
}

.hero-greeting {
  display: block;
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.hero-name {
  display: block;
  font-size: var(--font-size-5xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: var(--font-size-2xl);
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  max-width: 500px;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-lg);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  animation: fadeInRight 1s ease-out 0.3s both;
}

.hero-avatar {
  position: relative;
  width: 300px;
  height: 300px;
}

.avatar-img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow-xl);
  position: relative;
  z-index: 2;
}

.avatar-ring {
  position: absolute;
  top: -20px;
  left: -20px;
  right: -20px;
  bottom: -20px;
  border: 3px solid var(--primary-color);
  border-radius: 50%;
  opacity: 0.3;
  animation: rotate 20s linear infinite;
}

.hero-tech-stack {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.tech-item {
  position: absolute;
  width: 60px;
  height: 60px;
  background-color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  font-size: var(--font-size-xl);
  color: var(--primary-color);
  animation: float 3s ease-in-out infinite;
}

.tech-item:nth-child(1) {
  top: 20%;
  right: -10%;
  animation-delay: 0s;
}

.tech-item:nth-child(2) {
  top: 60%;
  right: 10%;
  animation-delay: 0.5s;
}

.tech-item:nth-child(3) {
  bottom: 20%;
  left: 10%;
  animation-delay: 1s;
}

.tech-item:nth-child(4) {
  top: 40%;
  left: -10%;
  animation-delay: 1.5s;
}

.hero-scroll {
  position: absolute;
  bottom: var(--spacing-2xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  animation: fadeIn 1s ease-out 1s both;
}

.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-light);
  font-size: var(--font-size-sm);
  text-decoration: none;
  animation: bounce 2s infinite;
}

/* ===== SECTIONS ===== */
section {
  padding: var(--spacing-4xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-4xl);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

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

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
}

.about-intro h3 {
  font-size: var(--font-size-2xl);
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.about-highlights {
  margin: var(--spacing-2xl) 0;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.highlight-item i {
  color: var(--accent-color);
  font-size: var(--font-size-lg);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

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

.stat-number {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--primary-color);
  display: block;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.about-card {
  background-color: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

.card-header {
  background-color: var(--gray-800);
  color: var(--white);
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.card-dots {
  display: flex;
  gap: var(--spacing-xs);
}

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

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

.card-title {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.card-content {
  padding: var(--spacing-lg);
}

.card-content pre {
  margin: 0;
  font-family: 'Fira Code', Consolas, Monaco, 'Courier New', monospace;
  font-size: var(--font-size-sm);
  line-height: 1.6;
  color: var(--gray-700);
}

/* ===== SKILLS SECTION ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
}

.skill-category {
  background-color: var(--white);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

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

.skill-header i {
  font-size: var(--font-size-2xl);
  color: var(--primary-color);
}

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

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

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

.skill-name {
  font-weight: 500;
  color: var(--text-primary);
}

.skill-level {
  font-size: var(--font-size-sm);
  color: var(--text-light);
}

.skill-bar {
  height: 8px;
  background-color: var(--gray-200);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-sm);
  transition: width 1s ease-out;
  width: 0;
}

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

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
}

.contact-info h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
}

.contact-methods {
  margin-top: var(--spacing-2xl);
}

.contact-method {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.contact-method i {
  font-size: var(--font-size-xl);
  color: var(--primary-color);
  margin-top: var(--spacing-xs);
}

.contact-method h4 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xs);
}

.contact-method a {
  color: var(--text-secondary);
  text-decoration: none;
}

.contact-method a:hover {
  color: var(--primary-color);
}

.contact-form-container {
  background-color: var(--white);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

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

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===== FOOTER ===== */
.footer {
  background-color: var(--gray-900);
  color: var(--white);
  padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
  color: var(--white);
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  color: var(--gray-300);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section p {
  color: var(--gray-400);
  line-height: 1.6;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
  color: var(--gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
  color: var(--white);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--gray-800);
  color: var(--gray-400);
  border-radius: 50%;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-links a:hover {
  background-color: var(--primary-color);
  color: var(--white);
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid var(--gray-800);
  padding-top: var(--spacing-xl);
  text-align: center;
}

.footer-bottom p {
  color: var(--gray-400);
  margin: 0;
}

.footer-bottom i {
  color: #ff5f56;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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

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

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

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

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  /* Typography */
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  
  .hero-name {
    font-size: var(--font-size-4xl);
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
  
  /* Navigation */
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background-color: var(--white);
    transition: left var(--transition-normal);
    z-index: 999;
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-list {
    flex-direction: column;
    padding: var(--spacing-2xl);
    gap: var(--spacing-xl);
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-toggle.active .bar:nth-child(1) {
    transform: rotate(-45deg) translate(-6px, 6px);
  }
  
  .nav-toggle.active .bar:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active .bar:nth-child(3) {
    transform: rotate(45deg) translate(-6px, -6px);
  }
  
  /* Hero */
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    text-align: center;
  }
  
  .hero-visual {
    order: -1;
  }
  
  .hero-avatar {
    width: 250px;
    height: 250px;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  /* About */
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
  
  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
  }
  
  /* Skills */
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  /* Contact */
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  /* Footer */
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    text-align: center;
  }
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.mb-0 { margin-bottom: 0; }
.mt-lg { margin-top: var(--spacing-lg); }
.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}