:root {
  --bg-color: #0f172a;
  --text-color: #f8fafc;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --card-bg: rgba(30, 41, 59, 0.7);
  --border-color: rgba(255, 255, 255, 0.1);
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --transition: all 0.3s ease;
}

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

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

/* Typography */
h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(2rem, 3vw, 2.5rem);
  margin-bottom: 2rem;
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 40px;
  height: 4px;
  background-color: var(--accent-color);
  border-radius: 2px;
}

p {
  font-size: 1.125rem;
  color: #94a3b8;
  max-width: 600px;
  margin-bottom: 1.5rem;
}

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

/* Layout Utilities */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

section {
  padding: 100px 0;
}

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1.5rem 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -1px;
}

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

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: #cbd5e1;
}

.nav-links a:hover {
  color: var(--accent-color);
}

/* Hero Section */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
}

.hero-content {
  max-width: 800px;
}

.hero-greeting {
  color: var(--accent-color);
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: block;
}

.highlight {
  background: linear-gradient(135deg, #60a5fa, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  border: none;
}

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

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

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-color);
  margin-left: 1rem;
}

.btn-outline:hover {
  border-color: var(--text-color);
  background: rgba(255, 255, 255, 0.05);
}

.hero-buttons {
  margin-top: 2.5rem;
}

/* About Section */
#about .about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

.skills-container {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.skill-tag {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  color: #e2e8f0;
}

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-10px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.project-img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-bottom: 1px solid var(--border-color);
}

.project-info {
  padding: 1.5rem;
}

.project-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.project-desc {
  font-size: 1rem;
  margin-bottom: 1rem;
}

.project-tech {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.project-tech span {
  font-size: 0.8rem;
  color: var(--accent-color);
  background: rgba(59, 130, 246, 0.1);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

/* Contact Section */
#contact {
  text-align: center;
  margin-bottom: 50px;
}

#contact p {
  margin: 0 auto 2rem;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: #64748b;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none; /* In a real app, you'd add a hamburger menu */
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
}