:root {
  --bg-color: #0a0a0a;
  --text-color: #e5e5e5;
  --primary-color: #6366f1;
  --secondary-color: #a855f7;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --card-hover: rgba(255, 255, 255, 0.08);
}

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

body {
  font-family: "Outfit", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Dynamic Background */
.background-gradient {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(
      circle at 10% 20%,
      rgba(99, 102, 241, 0.15) 0%,
      transparent 20%
    ),
    radial-gradient(
      circle at 90% 80%,
      rgba(168, 85, 247, 0.15) 0%,
      transparent 20%
    );
  z-index: -1;
}

/* Glassmorphism */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

/* Navigation */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5%;
  position: fixed;
  width: 90%;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(
    45deg,
    var(--primary-color),
    var(--secondary-color)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.nav-links a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  transition: color 0.3s;
}

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

.hamburger {
  display: none;
  cursor: pointer;
}

/* Buttons */
.btn-primary,
.btn-secondary {
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition:
    transform 0.2s,
    box-shadow 0.2s;
  display: inline-block;
}

.btn-primary {
  background: linear-gradient(
    45deg,
    var(--primary-color),
    var(--secondary-color)
  );
  color: white;
}

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

.btn-primary:hover,
.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(99, 102, 241, 0.2);
}

/* Hero Section */
#hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 20px;
}

.hero-content h1 {
  font-size: 4rem;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.gradient-text {
  background: linear-gradient(
    45deg,
    var(--primary-color),
    var(--secondary-color)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  font-size: 1.2rem;
  color: #a3a3a3;
  margin-bottom: 2rem;
}

/* Sections */
.container {
  padding: 5rem 10%;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 3rem;
  text-align: center;
}

.card {
  padding: 2rem;
  margin-bottom: 2rem;
  transition:
    transform 0.3s,
    background 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  background: var(--card-hover);
}

/* Research & Projects Grid */
.research-grid,
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.badge {
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-color);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: 0.5rem;
}

.tech-stack {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-stack span {
  background: rgba(255, 255, 255, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-size: 0.85rem;
}

/* Timeline */
.timeline-item {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
}

.year {
  min-width: 100px;
  font-weight: 700;
  color: var(--primary-color);
  padding-top: 1rem;
}

.timeline-item .content {
  flex-grow: 1;
}

/* Contact */
.contact-box {
  text-align: center;
  padding: 4rem 2rem;
}

.contact-links {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.contact-link {
  color: var(--text-color);
  text-decoration: none;
  font-size: 1.1rem;
  transition: color 0.3s;
}

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

.contact-link span {
  font-weight: 600;
  margin-right: 5px;
}

footer {
  text-align: center;
  padding: 2rem;
  color: #666;
  border-top: 1px solid var(--glass-border);
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s ease forwards;
}

.delay-1 {
  animation-delay: 0.2s;
}
.delay-2 {
  animation-delay: 0.4s;
}

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

/* Responsive */
@media (max-width: 768px) {
  .hero-content h1 {
    font-size: 2.5rem;
  }
  .nav-links {
    display: none;
  }
  .hamburger {
    display: block;
  }
  nav {
    width: 100%;
    top: 0;
    border-radius: 0;
  }
}