:root {
  --bg: #f8f9fa;
  --text: #212529;
  --accent: #6366f1;
  --link: #4f46e5;
  --card: #ffffff;
  --glass: rgba(255, 255, 255, 0.25);
}

body.dark {
  --bg: #121212;
  --text: #eaeaea;
  --accent: #a78bfa;
  --link: #8b5cf6;
  --card: #1f1f1f;
  --glass: rgba(30, 30, 30, 0.25);
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 960px;
  margin: auto;
  padding: 2rem 1rem;
}

header {
  position: sticky;
  top: 0;
  z-index: 999;
  backdrop-filter: blur(10px);
  background: var(--glass);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

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

.nav-links {
  display: flex;
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

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

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

#themeToggle {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  margin-left: auto;
  color: var(--link);
}

h2 {
  font-size: 2rem;
  border-left: 4px solid var(--accent);
  padding-left: 0.5rem;
  margin-bottom: 1rem;
}

section {
  margin-bottom: 3rem;
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skills-grid span {
  background: var(--card);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  box-shadow: 0 0 8px rgba(0,0,0,0.05);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.projects-grid .project {
  background: var(--card);
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  transition: transform 0.2s ease;
}

.projects-grid .project:hover {
  transform: translateY(-4px);
}

.projects-grid h3 {
  margin: 0 0 0.5rem;
}

.projects-grid a {
  color: var(--link);
  text-decoration: none;
}

.card {
  background: var(--card);
  padding: 1rem 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.cert-list {
  list-style: none;
  padding: 0;
}

.cert-list li {
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.cert-list i {
  color: var(--accent);
  margin-right: 0.5rem;
}

footer {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid #ddd;
  backdrop-filter: blur(10px);
  background: var(--glass);
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}