@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700;900&display=swap');

:root {
  --bg-color: #0D1117;
  --primary-text: #C9D1D9;
  --secondary-text: #8B949E;
  --accent-color: #58A6FF;
  --accent-hover: #79c0ff;
  --border-color: #30363D;
  --card-bg: #161B22;
  --header-bg: rgba(22, 27, 34, 0.8);
  --glow-color: rgba(88, 166, 255, 0.3);
  --font-main: 'Inter', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--primary-text);
  line-height: 1.7;
  font-size: 16px;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* --- Header & Navigation --- */
.site-header {
  background-color: var(--header-bg);
  backdrop-filter: blur(10px);
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
}

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

.logo {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--primary-text);
  text-decoration: none;
  letter-spacing: -1px;
}

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

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.main-nav a {
  text-decoration: none;
  color: var(--primary-text);
  font-weight: 500;
  position: relative;
  transition: color 0.3s ease;
}

.main-nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -5px;
  left: 50%;
  background-color: var(--accent-color);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

.main-nav a:hover, .main-nav a.active {
  color: var(--accent-color);
}

.main-nav a:hover::after, .main-nav a.active::after {
  width: 100%;
}

.mobile-nav-toggle {
    display: none;
    font-size: 2rem;
    cursor: pointer;
}

/* --- Main Content --- */
.main-content {
  padding: 4rem 0;
}

.main-grid {
  display: grid;
  grid-template-columns: 3fr 1fr;
  gap: 3rem;
}

.content-area, .sidebar {
  padding: 0;
}

h1, h2, h3 {
  color: var(--primary-text);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.8rem;
  font-weight: 900;
  margin-bottom: 1.5rem;
  background: linear-gradient(90deg, var(--accent-color), #f778ba);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: 2rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-top: 2.5rem;
}

h3 {
  font-size: 1.5rem;
  margin-top: 2rem;
  color: var(--accent-hover);
}

p {
  margin-bottom: 1.5rem;
  color: var(--secondary-text);
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

/* --- Blog Articles Section --- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.article-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--glow-color);
}

.article-card-content {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.article-card-content h3 {
  margin-top: 0;
  font-size: 1.25rem;
  color: var(--primary-text);
}

.article-card-content p {
  color: var(--secondary-text);
  font-size: 0.95rem;
  flex-grow: 1;
}

.read-more-btn {
  display: inline-block;
  background-color: transparent;
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
  padding: 0.6rem 1.2rem;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 500;
  align-self: flex-start;
  margin-top: 1rem;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.read-more-btn:hover {
  background-color: var(--accent-color);
  color: var(--bg-color);
  text-decoration: none;
}

/* --- Sidebar --- */
.sidebar-widget {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.sidebar-widget h3 {
  margin-top: 0;
  font-size: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.sidebar-widget ul {
  list-style: none;
  padding-top: 1rem;
}

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

.sidebar-widget a {
  color: var(--secondary-text);
  display: block;
}
.sidebar-widget a:hover {
  color: var(--accent-color);
}

.promo-text {
  font-style: italic;
  color: var(--accent-hover);
}

/* --- Article Page --- */
.article-header {
  margin-bottom: 3rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2rem;
}

.article-meta {
  display: flex;
  justify-content: center;
  gap: 1rem;
  color: var(--secondary-text);
  margin-top: 1rem;
}

.article-content ul, .article-content ol {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-text);
}

.article-content li {
    margin-bottom: 0.5rem;
}

.cta-section {
    background-color: var(--card-bg);
    border: 1px solid var(--accent-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    margin-top: 3rem;
    box-shadow: 0 0 15px var(--glow-color);
}

.cta-section h2 {
    border-bottom: none;
}

/* --- Footer --- */
.site-footer {
  background-color: var(--card-bg);
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  text-align: center;
  margin-top: 4rem;
  color: var(--secondary-text);
}

/* --- Simple Pages (About, Contact, etc.) --- */
.simple-page {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

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

@media (max-width: 768px) {
  h1 {
    font-size: 2.2rem;
  }

  h2 {
    font-size: 1.8rem;
  }

  .header-container {
      position: relative;
  }

  .main-nav {
      display: none;
      width: 100%;
      position: absolute;
      top: 100%;
      left: 0;
      background-color: var(--bg-color);
      border-bottom: 1px solid var(--border-color);
  }

  .main-nav.active {
      display: block;
  }

  .main-nav ul {
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
    align-items: center;
  }

  .mobile-nav-toggle {
      display: block;
  }
}