@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap');
:root {
  --bg-color: #ffffff;
  --text-color: #000000;
  --border-color: #000000;
  --overlay-bg: rgba(255, 255, 255, 0.9);
  --hover-opacity: 0.6;
  --transition: all 0.3s ease;
}

[data-theme="dark"] {
  --bg-color: #0f0f0f;
  --text-color: #ffffff;
  --border-color: #ffffff;
  --overlay-bg: rgba(15, 15, 15, 0.9);
  --hover-opacity: 0.8;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: var(--transition);
}

body {
  font-family: 'Space Mono', monospace;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

header {
  padding: 2rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -1px;
}

.nav-links a {
  margin-left: 2rem;
  text-decoration: none;
  color: var(--text-color);
  font-size: 0.9rem;
  transition: opacity 0.3s;
}

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

/* Theme Switch Icon Button */
.theme-icon-btn {
  cursor: pointer;
  font-size: 1.2rem;
  margin-left: 2rem;
  background: none;
  border: none;
  color: var(--text-color);
  transition: transform 0.3s ease;
}

.theme-icon-btn:hover {
  transform: scale(1.2);
}

.heading {
  font-size: 3.5rem;
  margin: 4rem 0;
  padding: 0 2rem;
  position: relative;
}

.heading:after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 2rem;
  width: 100px;
  height: 4px;
  background: var(--text-color);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  padding: 2rem;
}

.project-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: transform 0.3s ease;
  height: 300px;
}

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

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0%);
  transition: filter 0.3s ease;
}

.project-card:hover .project-image {
  filter: grayscale(100%);
}

.project-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--overlay-bg);
  padding: 1.5rem;
  transform: translateY(100%);
  transition: transform 0.3s ease;
  color: var(--text-color);
}

.project-card:hover .project-overlay {
  transform: translateY(0);
}

.project-title {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.project-tags {
  font-size: 0.8rem;
  margin-bottom: 1rem;
  opacity: 0.8;
}

.project-links a {
  color: var(--text-color);
  margin-right: 1rem;
  text-decoration: none;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
}

.project-links a i {
  margin-right: 0.5rem;
}

.project-links a:hover {
  text-decoration: underline;
}

.featured-project {
  grid-column: span 2;
  height: 400px;
}

footer {
  padding: 2rem;
  text-align: center;
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
}

@media (max-width: 768px) {
  .heading {
    font-size: 2.5rem;
  }

  .featured-project {
    grid-column: span 1;
    height: 300px;
  }

  .nav-links a {
    margin-left: 1rem;
    font-size: 0.8rem;
  }

  .theme-icon-btn {
    margin-left: 1rem;
  }
}