:root {
  --bg: #0f0f0f;
  --bg-alt: #111;
  --text: #f4f4f4;
  --accent: #00ffff;
  --card: #222;
}
body.light {
  --bg: #f4f4f4;
  --bg-alt: #fff;
  --text: #111;
  --accent: #0077cc;
  --card: #e0e0e0;
}
body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: all 0.3s ease;
}
a { color: var(--accent); text-decoration: none; }

header {
  background: rgba(17, 17, 17, 0.7);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 999;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.3);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  max-width: 1200px;
  margin: auto;
}

.logo {
  font-size: 1.6rem;
  color: var(--text);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links.active {
  display: block;
}

.nav-toggle {
  display: none;
}

.nav-tools {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.resume-btn i {
  margin-right: 0.4rem;
}

#theme-toggle {
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
}

.section {
  padding: 4rem 2rem;
  text-align: center;
  max-width: 960px;
  margin: auto;
}

.skills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.skills li {
  background: var(--card);
  padding: 0.7rem 1rem;
  border-radius: 8px;
  transition: transform 0.3s;
}

.skills li:hover {
  transform: scale(1.1);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.project-card {
  background: var(--card);
  padding: 1.5rem;
  border-radius: 10px;
  transition: transform 0.3s, box-shadow 0.3s;
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.card {
  background: var(--card);
  padding: 1.5rem;
  border-radius: 10px;
  text-align: left;
  transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.card-date {
  font-size: 0.9rem;
  color: #aaa;
  margin: 0.5rem 0;
}

footer {
  background: var(--bg-alt);
  text-align: center;
  padding: 1rem;
  color: #aaa;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    flex-direction: column;
    gap: 0.8rem;
    width: 100%;
  }

  .nav-toggle {
    display: block;
    cursor: pointer;
  }

  .projects-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 3rem 1rem;
  }
}