/* CSS Custom Properties */
:root {
  --primary-color: #333;
  --secondary-color: #666;
  --accent-color: #f4f4f4;
  --text-color: #333;
  --background-color: #fff;
  --max-width: 1200px;
  --spacing: clamp(1rem, 2vw, 2rem);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

/* Navigation */
.navbar {
  background-color: var(--background-color);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 60px;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
}

.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--primary-color);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing);
}

.nav-menu li a {
  padding: 0.5rem 1rem;
  transition: background-color 0.3s ease;
}

.nav-menu li a:hover {
  background-color: var(--accent-color);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-toggle-label {
    display: block;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--background-color);
    flex-direction: column;
    gap: 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: none;
  }

  .nav-toggle:checked ~ .nav-menu {
    display: flex;
  }

  .nav-menu li {
    border-bottom: 1px solid var(--accent-color);
  }

  .nav-menu li a {
    display: block;
    padding: 1rem;
  }
}

/* Hero Section */
.hero {
  position: relative;
  height: clamp(50vh, 60vh, 80vh);
  overflow: hidden;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

.hero-logo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(70vw, 480px);
  z-index: 1;
}

.hero-logo-image {
  width: 100%;
  height: auto;
}

/* Portfolio Section */
.portfolio {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing);
}

.portfolio h2 {
  text-align: center;
  margin-bottom: var(--spacing);
  font-size: clamp(1.5rem, 3vw, 2.5rem);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing);
}

.project-card {
  background-color: var(--background-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 12px rgba(0,0,0,0.15);
}

.project-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.project-card h3 {
  padding: 1rem;
  font-size: 1.2rem;
  text-align: center;
}

/* Responsive Adjustments */
@media (max-width: 480px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

/* Page Content Styles */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing);
}

.about, .contact, .project-detail {
  padding: var(--spacing) 0;
}

.about h1, .contact h1, .project-detail h1 {
  margin-bottom: var(--spacing);
  font-size: clamp(2rem, 4vw, 3rem);
}

.about p, .contact p {
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.contact-info {
  margin-top: var(--spacing);
}

.contact-info p {
  margin-bottom: 0.5rem;
}

.project-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing);
  margin: var(--spacing) 0;
}

.project-info {
  margin: var(--spacing) 0;
}

.project-info ul {
  list-style: none;
  padding: 0;
}

.project-info li {
  margin-bottom: 0.5rem;
}

.back-link {
  display: inline-block;
  margin-top: var(--spacing);
  color: var(--primary-color);
  font-weight: bold;
  transition: color 0.3s ease;
}

.back-link:hover {
  color: var(--secondary-color);
}

/* Portfolio Index Table */
.portfolio-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
}

.portfolio-table th,
.portfolio-table td {
  border: 1px solid #ddd;
  padding: 12px;
  text-align: left;
}

.portfolio-table th {
  background-color: #f2f2f2;
}

.portfolio-table tr:nth-child(even) {
  background-color: #f9f9f9;
}

.portfolio-table a {
  color: #007bff;
  text-decoration: none;
}

.portfolio-table a:hover {
  text-decoration: underline;
}

.site-footer {
  margin-top: 2rem;
  padding: 1.25rem 0;
  border-top: 1px solid #ddd;
  color: var(--secondary-color);
  font-size: 0.95rem;
}