/* Piarnet.com - Main Stylesheet */
:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e74c3c;
  --text-color: #333;
  --light-bg: #f8f9fa;
  --white: #ffffff;
  --border-color: #dee2e6;
  --shadow: 0 2px 10px rgba(0,0,0,0.1);
}

* {
  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(--light-bg);
}

/* Header */
header {
  background: linear-gradient(135deg, var(--primary-color) 0%, #1a252f 100%);
  color: var(--white);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow);
}

.header-top {
  background: rgba(0,0,0,0.2);
  padding: 8px 0;
  font-size: 0.85rem;
}

.header-top .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-main {
  padding: 15px 0;
}

.header-main .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 2rem;
  font-weight: 700;
  color: var(--white);
  text-decoration: none;
  letter-spacing: 1px;
}

.logo span {
  color: var(--secondary-color);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 30px;
}

nav a {
  color: var(--white);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  padding: 5px 0;
  position: relative;
}

nav a:hover {
  color: var(--secondary-color);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--secondary-color);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Main Content */
main {
  min-height: calc(100vh - 300px);
  padding: 40px 0;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--secondary-color) 0%, #2980b9 100%);
  color: var(--white);
  padding: 80px 0;
  text-align: center;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto;
  opacity: 0.9;
}

/* Page Header */
.page-header {
  background: var(--white);
  padding: 40px 0;
  margin-bottom: 30px;
  box-shadow: var(--shadow);
}

.page-header h1 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.breadcrumb {
  color: #666;
  font-size: 0.9rem;
}

.breadcrumb a {
  color: var(--secondary-color);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* Article/Content Styles */
.content-wrapper {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 30px;
}

.article-content {
  background: var(--white);
  padding: 40px;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.article-content h1 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 20px;
}

.article-content h2 {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin: 30px 0 15px;
}

.article-content h3 {
  font-size: 1.2rem;
  color: var(--primary-color);
  margin: 25px 0 12px;
}

.article-content p {
  margin-bottom: 15px;
  line-height: 1.8;
}

.article-content ul, .article-content ol {
  margin: 15px 0 15px 30px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-meta {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 25px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

/* Sidebar */
.sidebar {
  background: var(--white);
  padding: 25px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  height: fit-content;
  position: sticky;
  top: 100px;
}

.sidebar h3 {
  font-size: 1.1rem;
  color: var(--primary-color);
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--secondary-color);
}

.sidebar ul {
  list-style: none;
}

.sidebar li {
  margin-bottom: 10px;
}

.sidebar a {
  color: var(--text-color);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.3s ease;
}

.sidebar a:hover {
  color: var(--secondary-color);
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.product-card {
  background: var(--white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.product-card-image {
  height: 200px;
  background: linear-gradient(135deg, var(--light-bg) 0%, #e9ecef 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999;
  font-size: 3rem;
}

.product-card-content {
  padding: 20px;
}

.product-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--primary-color);
}

.product-card p {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 15px;
}

.product-card a {
  display: inline-block;
  color: var(--secondary-color);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

.product-card a:hover {
  color: var(--primary-color);
}

/* Categories Section */
.categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin: 40px 0;
}

.category-card {
  background: var(--white);
  padding: 30px;
  text-align: center;
  border-radius: 8px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
}

.category-card:hover {
  transform: translateY(-3px);
}

.category-card h3 {
  margin-top: 15px;
  color: var(--primary-color);
}

.category-icon {
  font-size: 2.5rem;
  color: var(--secondary-color);
}

/* Footer */
footer {
  background: linear-gradient(135deg, var(--primary-color) 0%, #1a252f 100%);
  color: var(--white);
  padding: 60px 0 20px;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: var(--secondary-color);
}

.footer-section p {
  opacity: 0.8;
  line-height: 1.8;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 10px;
}

.footer-section a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section a:hover {
  color: var(--secondary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  opacity: 0.7;
  font-size: 0.9rem;
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.mt-40 { margin-top: 40px; }
.mb-40 { margin-bottom: 40px; }

/* Button Styles */
.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-primary {
  background: var(--secondary-color);
  color: var(--white);
}

.btn-primary:hover {
  background: #2980b9;
}

/* Responsive Design */
@media (max-width: 992px) {
  .content-wrapper {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .header-main .container {
    flex-direction: column;
    gap: 15px;
  }

  nav ul {
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .article-content {
    padding: 25px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
}