/* Import Font */
@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500;700&display=swap');

/* --- CSS Variables (DarkNova Theme) --- */
:root {
  --bg-color: #0d1117;
  --surface-color: #161b22;
  --border-color: #30363d;
  --primary-color: #238636;
  --primary-hover: #2ea043;
  --text-color: #c9d1d9;
  --text-muted: #8b949e;
  --font-family: 'Fira Code', monospace;
  --container-width: 1200px;
  --border-radius: 6px;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  --transition-speed: 0.3s;
}

/* --- Base & Reset Styles --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-speed) ease;
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-bottom: 1rem;
  font-weight: 700;
  color: var(--text-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
  margin-bottom: 1rem;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius);
}

.logo-img {
    background: #fff;
    padding: 5px;
    margin: 10px 0;
}

/* --- Layout --- */
.container {
  width: 90%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 2rem 0;
}

.main-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* --- Header --- */
.site-header {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.site-title a {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-color);
  text-decoration: none;
}
.site-title a:hover {
    color: var(--primary-hover);
}

.main-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
}

.main-nav a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--text-muted);
  font-weight: 500;
  border-radius: var(--border-radius);
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

.main-nav a:hover,
.main-nav a.active {
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
}

/* --- Main Content --- */
main {
  flex-grow: 1;
}

.page-content {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

/* --- Sidebar --- */
.sidebar-widget {
  background-color: var(--surface-color);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

.sidebar-widget h3 {
  font-size: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.sidebar-widget ul {
  list-style: none;
}

.sidebar-widget ul li {
  margin-bottom: 0.75rem;
}

.sidebar-widget ul a::before {
  content: '»';
  margin-right: 0.5rem;
  color: var(--primary-color);
}

.promo-widget {
  background: linear-gradient(45deg, var(--primary-color), var(--primary-hover));
  color: white;
  padding: 1.5rem;
  border-radius: var(--border-radius);
}

.promo-widget a {
    color: white;
    font-weight: bold;
}

/* --- Article Cards (Homepage) --- */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.article-card {
  background-color: var(--surface-color);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.6);
}

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

.article-card-content {
  padding: 1.5rem;
}

.article-card-category {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: 0.5rem;
}

.article-card h2 {
  font-size: 1.25rem;
}

.read-more-link {
  display: inline-block;
  margin-top: 1rem;
  font-weight: bold;
}

/* --- Article Page --- */
.article-header {
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
    padding-bottom: 1rem;
}

.article-meta {
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.article-content h2, .article-content h3 {
    margin-top: 2rem;
}
.article-content .pro-tip {
    background-color: rgba(35, 134, 54, 0.1);
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin: 2rem 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}
.article-content .pro-tip strong {
    color: var(--primary-color);
    display: block;
    margin-bottom: 0.5rem;
}
.article-content .cta-section {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-top: 2rem;
}

.related-articles {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}
.related-articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}
.related-article-card {
    background-color: var(--bg-color);
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-speed);
}
.related-article-card:hover {
    border-color: var(--primary-color);
}
.related-article-card h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}
.related-article-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0;
}

/* --- Footer --- */
.site-footer {
  background-color: var(--surface-color);
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  margin-top: auto;
}
.footer-links {
    margin-bottom: 1rem;
}
.footer-links a {
    margin: 0 0.75rem;
    color: var(--text-muted);
}
.footer-links a:hover {
    color: var(--primary-color);
}

/* --- Responsive Media Queries --- */

/* Tablet */
@media (min-width: 768px) {
  .site-header .container {
    flex-direction: row;
  }
  .main-nav ul {
    margin-top: 0;
    gap: 1rem;
  }
  .main-layout {
    grid-template-columns: 2fr 1fr;
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .related-articles-grid {
      grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop */
@media (min-width: 1024px) {
  h1 { font-size: 3rem; }
  .main-layout {
    grid-template-columns: 3fr 1fr;
  }
   .related-articles-grid {
      grid-template-columns: repeat(3, 1fr);
  }
}