:root {
  --bg-color: #f8f9fa;
  --text-color: #333333;
  --header-bg: #ffffff;
  --card-bg: #ffffff;
  --accent-color: #007bff;
  --border-color: #e9ecef;
  --footer-bg: #343a40;
  --footer-text: #adb5bd;
}

[data-theme='dark'] {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --header-bg: #1e1e1e;
  --card-bg: #1e1e1e;
  --accent-color: #4dabf7;
  --border-color: #333333;
  --footer-bg: #000000;
  --footer-text: #888888;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  transition: background-color 0.3s, color 0.3s;
}

/* Header & Nav */
header {
  background-color: var(--header-bg);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 0 20px;
}

.navbar {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
}

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

.nav-links {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
}

.nav-btn {
  background: none;
  border: 1px solid var(--border-color);
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-color);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--accent-color), #6610f2);
  color: white;
  padding: 80px 20px;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.cta-button {
  display: inline-block;
  background-color: white;
  color: var(--accent-color);
  padding: 10px 25px;
  text-decoration: none;
  border-radius: 25px;
  font-weight: bold;
  margin-top: 20px;
  transition: transform 0.2s;
}

.cta-button:hover {
  transform: translateY(-2px);
}

/* Articles Section */
.articles-section {
  max-width: 1200px;
  margin: 60px auto;
  padding: 0 20px;
}

.articles-section h2 {
  text-align: center;
  margin-bottom: 40px;
  font-size: 2rem;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.card-content {
  padding: 20px;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 10px;
}

.meta {
  font-size: 0.85rem;
  color: #6c757d;
  margin-bottom: 15px;
}

.read-more {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: bold;
  display: inline-block;
  margin-top: 10px;
}

/* Contact Section */
.contact-wrapper {
  background-color: var(--card-bg);
  padding: 60px 20px;
  border-top: 1px solid var(--border-color);
}

.contact-container {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact-form {
  text-align: left;
  margin-top: 30px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--bg-color);
  color: var(--text-color);
  box-sizing: border-box;
}

.form-group textarea {
  height: 120px;
  resize: vertical;
}

.submit-btn {
  width: 100%;
  padding: 12px;
  background-color: var(--accent-color);
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.2s;
}

.submit-btn:hover {
  filter: brightness(90%);
}

/* Comments */
.comment-wrapper {
  max-width: 800px;
  margin: 40px auto;
  padding: 0 20px;
}

/* Footer */
footer {
  background-color: var(--footer-bg);
  color: var(--footer-text);
  padding: 40px 20px;
  margin-top: 60px;
  text-align: center;
}

.footer-links {
  list-style: none;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
}

.footer-links a {
  color: var(--footer-text);
  text-decoration: none;
}

.footer-links a:hover {
  color: white;
}