/* CSS Variables (from your original styles.css for consistency) */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #64748b;
  --accent: #f59e0b;
  --background: #ffffff;
  --surface: #f8fafc;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.07);
  --radius: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

[data-theme="dark"] {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #94a3b8;
  --background: #0f172a;
  --surface: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: #334155;
}

/* Reset and Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-sans);
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition);
}
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1rem;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Page Header */
.page-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}
.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1rem;
}
.back-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}
.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem;
  cursor: pointer;
  transition: var(--transition);
}
.theme-toggle:hover {
  background: var(--primary);
  color: white;
}

/* Intro Section */
.projects-intro {
  text-align: center;
  padding: 4rem 0 3rem;
}
.main-title {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.main-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* Filter Buttons */
.project-filters {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 3rem;
}
.filter-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
}
.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--primary);
}
.filter-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Project List Styling */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding-bottom: 5rem;
}

/* Individual Project Entry - Inspired by simple_portfolio.txt's structure */
.project-entry {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  align-items: start;
  border-left: 4px solid var(--primary);
  box-shadow: var(--shadow);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
}
.project-entry.visible {
  opacity: 1;
  transform: translateY(0);
}
.project-entry:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.project-title {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}
.project-category {
  font-size: 0.875rem;
  color: var(--secondary);
  margin-bottom: 1rem;
  display: inline-block;
}
.project-description {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.project-details h3 {
  font-size: 1rem;
  color: var(--primary);
  margin: 1.5rem 0 0.75rem;
}
.project-details ul {
  list-style-position: inside;
  color: var(--text-secondary);
  padding-left: 0.5rem;
}
.project-details li {
  margin-bottom: 0.5rem;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.project-tech span {
  font-size: 0.75rem;
  background: var(--background);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 99px;
}

.project-visuals {
  text-align: center;
}
.project-visuals img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 1rem;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* Special Link Style - Modernized version of simple_portfolio.txt's a#special */
.special-link {
  display: inline-block;
  font-weight: 500;
  color: var(--primary);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
  transition: color 0.3s;
}
.special-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s cubic-bezier(0.19, 1, 0.22, 1);
}
.special-link:hover {
  color: var(--primary-dark);
}
.special-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Footer */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
  .project-entry {
    grid-template-columns: 1fr;
  }
  .project-visuals {
    grid-row: 1;
  }
}