/* --- AI / Modern Theme --- */
/* Font: Inter */
/* Tone: Informative & Straightforward */

:root {
  --primary-bg: #111827; /* Very Dark Blue */
  --secondary-bg: #1F2937; /* Dark Blue-Gray */
  --card-bg: #374151; /* Gray */
  --border-color: #4B5563;
  --text-primary: #F3F4F6; /* Light Gray */
  --text-secondary: #9CA3AF; /* Medium Gray */
  --accent-color: #3B82F6; /* Bright Blue */
  --accent-hover: #2563EB;
  --header-font: 'Inter', sans-serif;
  --body-font: 'Inter', sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

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

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--header-font);
  color: var(--text-primary);
  margin-bottom: 1rem;
  line-height: 1.3;
  font-weight: 700;
}

h1 {
  font-size: 2.5rem;
  border-bottom: 2px solid var(--accent-color);
  padding-bottom: 0.5rem;
  display: inline-block;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
  color: var(--text-secondary);
}

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

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

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

ul, ol {
    padding-left: 20px;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.5rem;
}

/* --- Layout & Container --- */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 0;
}

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

@media (min-width: 992px) {
  .main-layout {
    grid-template-columns: 3fr 1fr;
  }
}

/* --- Header & Navigation --- */
.site-header {
  background-color: var(--secondary-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background-color: rgba(31, 41, 55, 0.8);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.site-title a {
  color: inherit;
  text-decoration: none;
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  padding: 0;
  margin: 0;
}

.main-nav a {
  font-weight: 500;
  font-size: 1rem;
  padding: 0.5rem 0;
  position: relative;
  color: var(--text-secondary);
}

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

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

.main-nav a:hover::after, .main-nav a.active::after {
    width: 100%;
    left: 0;
}

/* --- Main Content & Articles --- */
main {
  padding: 1rem 0;
}

.intro-section {
    text-align: center;
    padding: 2rem 0;
    margin-bottom: 2rem;
    background: linear-gradient(145deg, var(--secondary-bg), var(--primary-bg));
    border-radius: 12px;
}

.intro-section h1 {
    border: none;
}

.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1200px) {
    .blog-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.article-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

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

.card-content h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.card-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex-grow: 1;
}

.read-more-btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.6rem 1.2rem;
  background-color: var(--accent-color);
  color: white;
  border-radius: 6px;
  font-weight: 600;
  text-align: center;
  transition: background-color 0.3s ease;
}

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

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

.article-meta {
    display: flex;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 1rem;
}

.article-content h2 {
    margin-top: 2.5rem;
}

.article-content h3 {
    margin-top: 2rem;
}

.cta-box {
    background-color: var(--secondary-bg);
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 0 8px 8px 0;
}

.cta-box p {
    margin: 0;
}

/* --- Sidebar --- */
.sidebar {
  padding: 1.5rem;
  background-color: var(--secondary-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  position: sticky;
  top: 100px;
}

.sidebar-widget {
  margin-bottom: 2rem;
}

.sidebar-widget:last-child {
  margin-bottom: 0;
}

.sidebar-widget h3 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.sidebar-widget ul {
  list-style: none;
  padding: 0;
}

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

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

.promo-text {
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 8px;
    font-style: italic;
    text-align: center;
}

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

/* --- Simple Page Styles --- */
.simple-page-content {
    background-color: var(--secondary-bg);
    padding: 2rem;
    border-radius: 12px;
}

.simple-page-content h1 {
    border: none;
    text-align: center;
    margin-bottom: 2rem;
}