* { box-sizing: border-box; }
:root {
  /* colors (light) */
  --bg: #F6FBFF;
  --surface: #FFFFFF;
  --text: #071033;
  --text-muted: #57677F;
  --border-color: #E6F0FF;
  --accent-color: #0B3D91;

  /* typography */
  --font-family: "Rubik", system-ui, -apple-system, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;

  /* geometry */
  --border-radius: 16px;
  --container-padding: 20px;

  /* depth */
  --shadow: 0 10px 28px rgba(0, 0, 0, 0.16);

  /* spacing scale */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;

  /* container widths */
  --container-max: 1200px;

  /* transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #07102A;
    --surface: #0B1A34;
    --text: #EAF6FF;
    --text-muted: #98B0D6;
    --border-color: #12314F;
    --accent-color: #FF6B35;
  }
}
h1, h2, h3, h4, h5, h6, p {
  margin: 0;
}
body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  background: var(--bg);
  color: var(--text);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
.site-main {
  padding-block: var(--space-xl);
}
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-md);
  padding-block: var(--space-lg);
}
a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}
a:hover {
  opacity: 0.85;
}

/* Header */
header {
  background: var(--bg);
  border-bottom: 1px solid var(--border-color);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
}
.logo img {
  width: 44px;
  height: 44px;
  border-radius: calc(var(--border-radius) - 4px);
}
.nav-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
}
.nav-menu a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}
.nav-menu a:hover {
  color: var(--accent-color);
}
#nav-toggle {
  display: none;
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
}
.hamburger span {
  display: block;
  width: 26px;
  height: 3px;
  background: var(--text);
  border-radius: 3px;
}

/* Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
  margin-block: var(--space-xl);
}
@media (min-width: 768px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Cards */
.card {
  padding: var(--space-lg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
.card p {
  color: var(--text);
}
.card-image {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
  border-radius: calc(var(--border-radius) - 2px);
  margin-bottom: var(--space-md);
}

/* Featured Image */
.featured-image {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--space-md) auto;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

/* Article Meta */
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: space-between;
  align-items: center;
  margin-block: var(--space-lg);
  padding-block: var(--space-sm);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.9rem;
}
.article-meta .author {
  font-weight: 600;
}

/* Article Content Images */
[itemprop="articleBody"] img {
  max-width: 45%;
  height: auto;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin: var(--space-xs) var(--space-lg) var(--space-md) 0;
}
[itemprop="articleBody"] img:nth-of-type(odd) {
  float: left;
  margin: var(--space-xs) var(--space-lg) var(--space-md) 0;
}
[itemprop="articleBody"] img:nth-of-type(even) {
  float: right;
  margin: var(--space-xs) 0 var(--space-md) var(--space-lg);
}
[itemprop="articleBody"]::after {
  content: "";
  display: table;
  clear: both;
}

/* Article Tables */
[itemprop="articleBody"] table {
  width: 100%;
  margin: var(--space-lg) 0;
  border-collapse: collapse;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  display: block;
  overflow-x: auto;
  white-space: nowrap;
}
[itemprop="articleBody"] table thead,
[itemprop="articleBody"] table tbody,
[itemprop="articleBody"] table tfoot {
  display: table;
  width: 100%;
  table-layout: fixed;
}
[itemprop="articleBody"] table thead {
  background: var(--accent-color);
  color: #fff;
}
[itemprop="articleBody"] table th,
[itemprop="articleBody"] table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border: 1px solid var(--border-color);
  white-space: normal;
  word-break: break-word;
}
[itemprop="articleBody"] table th {
  font-weight: 700;
  text-align: center;
}
[itemprop="articleBody"] table tbody tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.02);
}
@media (prefers-color-scheme: dark) {
  [itemprop="articleBody"] table tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
  }
}
[itemprop="articleBody"] table tbody tr:hover {
  background: rgba(0, 105, 217, 0.06);
}
@media (max-width: 768px) {
  [itemprop="articleBody"] table {
    font-size: 0.85rem;
  }
  [itemprop="articleBody"] table th,
  [itemprop="articleBody"] table td {
    padding: 0.5rem;
  }
}

/* Breadcrumb */
.breadcrumb {
  list-style: none;
  display: flex;
  gap: var(--space-xs);
  padding: 0;
  margin: 0 0 var(--space-md) 0;
}
.breadcrumb li:last-child {
  font-weight: 700;
}

/* Search Form */
.search-form {
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-lg);
}
.search-form input {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  font-size: 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  background: var(--bg);
  color: var(--text);
}
.search-form input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(0,105,217,0.06);
}
.search-form button {
  padding: var(--space-md) 1.5rem;
  font-size: 1rem;
  background: var(--accent-color);
  color: #fff;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: opacity 0.25s ease, transform 0.12s ease;
}
.search-form button:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

/* Responsive */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: calc(var(--space-lg) * 2 + 45px);
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border-color);
    z-index: 40;
  }
  .nav-menu ul {
    flex-direction: column;
    padding: var(--space-lg);
  }
  #nav-toggle:checked ~ .nav-menu {
    display: block;
  }
  [itemprop="articleBody"] img {
    float: none !important;
    max-width: 100%;
    margin: var(--space-lg) 0 !important;
  }
  .search-form {
    flex-direction: column;
  }
  .search-form button {
    width: 100%;
  }
}
@media (max-width: 480px) {
  .article-meta {
    flex-direction: column;
    gap: var(--space-xs);
    align-items: flex-start;
  }
}
[itemprop="articleBody"] {
  line-height: 1.75;
}
[itemprop="articleBody"] h1,
[itemprop="articleBody"] h2,
[itemprop="articleBody"] h3 {
  margin-block: var(--space-lg) var(--space-md);
}
[itemprop="articleBody"] p {
  margin-block: var(--space-md);
}
footer {
  text-align: center;
}