/* CSS Reset & Variables */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #22c55e;
  --dark: #0b1020;
  --darker: #070b18;
  --light: #e6e8ee;
  --muted: #9aa3b2;
  --card: #121833;
  --card-hover: #1a2346;
  --border: rgba(255,255,255,0.1);
  --maxw: 1200px;
  --font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--light);
  background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 50%, var(--darker) 100%);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  background: linear-gradient(to right, #fff, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
}

p {
  margin-bottom: 1rem;
}

a {
  color: #93c5fd;
  text-decoration: none;
  transition: var(--transition);
}

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

.muted {
  color: var(--muted);
}

/* Layout */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 80px 0;
}

/* Header & Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  backdrop-filter: saturate(180%) blur(20px);
  background: rgba(7, 11, 24, 0.85);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.site-header.scrolled {
  background: rgba(7, 11, 24, 0.95);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 20px;
}

.brand {
  font-weight: 700;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand::before {
  content: '';
  display: block;
  width: 8px;
  height: 8px;
  background: var(--secondary);
  border-radius: 50%;
}

.links {
  display: flex;
  gap: 24px;
}

.links a {
  position: relative;
  font-weight: 500;
  padding: 8px 0;
}

.links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

.links a:hover::after,
.links a.active::after {
  width: 100%;
}

.menu {
  display: none;
  background: transparent;
  color: var(--light);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  transition: var(--transition);
}

.menu:hover {
  background: rgba(255, 255, 255, 0.05);
}

/* Hero Section */
.hero {
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, rgba(37, 99, 235, 0) 70%);
  border-radius: 50%;
  z-index: -1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 60px;
}

.hero-text {
  min-width: 0;
}

.sub {
  font-size: 1.2rem;
  max-width: 70ch;
  margin: 16px 0 24px;
}

.cta-row {
  display: flex;
  gap: 16px;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

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

.btn.primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
}

.btn.secondary {
  background: transparent;
  color: var(--light);
  border: 1px solid var(--border);
}

.btn.secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
}

.role-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.role-chip {
  background: rgba(34, 197, 94, 0.1);
  color: var(--secondary);
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.hero-avatar {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--primary);
  box-shadow: var(--shadow);
  position: relative;
  z-index: 1;
}

.hero-avatar::after {
  content: '';
  position: absolute;
  top: -10px;
  left: -10px;
  right: -10px;
  bottom: -10px;
  border-radius: 50%;
  background: linear-gradient(45deg, var(--primary), var(--secondary));
  z-index: -1;
  opacity: 0.2;
  animation: pulse 3s infinite;
}

@keyframes pulse {
  0% { opacity: 0.2; }
  50% { opacity: 0.4; }
  100% { opacity: 0.2; }
}

/* Projects Section */
.section-head {
  margin-bottom: 40px;
  text-align: center;
}

.section-head h2::after {
  left: 50%;
  transform: translateX(-50%);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 24px;
}

.card {
  background: var(--card);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
  background: var(--card-hover);
  box-shadow: var(--shadow);
  border-color: rgba(37, 99, 235, 0.3);
}

.card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.card-icon {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

.card .muted {
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
  padding-top: 16px;
}

.tech-tag {
  background: rgba(37, 99, 235, 0.1);
  color: #93c5fd;
  padding: 4px 10px;
  border-radius: 50px;
  font-size: 0.8rem;
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.list {
  margin: 0;
  padding-left: 20px;
}

.list li {
  margin-bottom: 8px;
  position: relative;
}

.list li::marker {
  color: var(--primary);
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 24px;
}

.skill-category {
  background: var(--card);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.skill-category h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 1.2rem;
}

.skill-category h3::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
}

.skill-items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-item {
  background: rgba(37, 99, 235, 0.1);
  color: #93c5fd;
  padding: 6px 12px;
  border-radius: 50px;
  font-size: 0.9rem;
  border: 1px solid rgba(37, 99, 235, 0.2);
}

/* Contact Section */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 500px;
  margin: 0 auto;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.contact-link:hover {
  background: var(--card-hover);
  transform: translateX(5px);
}

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

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
  color: var(--muted);
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  border: none;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-grid {
    gap: 40px;
  }
  
  .hero-avatar {
    width: 240px;
    height: 240px;
  }
}

@media (max-width: 768px) {
  section {
    padding: 60px 0;
  }
  
  .hero {
    padding: 120px 0 60px;
  }
  
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 30px;
  }
  
  .hero-avatar {
    width: 200px;
    height: 200px;
    margin: 0 auto;
  }
  
  .cta-row {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .role-chips {
    justify-content: center;
  }
  
  .links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--darker);
    flex-direction: column;
    padding: 20px;
    border-top: 1px solid var(--border);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  }
  
  .links.open {
    display: flex;
  }
  
  .menu {
    display: block;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .nav {
    padding: 12px 16px;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
  }
  
  .card {
    padding: 20px;
  }
}