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

:root {
  --accent: #2563EB;
  --accent-hover: #1d4ed8;
  --text: #1a1a1a;
  --text-light: #555;
  --bg: #fff;
  --bg-light: #f7f8fa;
  --border: #e5e7eb;
  --radius: 6px;
  --max-width: 960px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1rem; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.site-logo:hover { text-decoration: none; color: var(--accent); }

/* Nav */
.main-nav ul {
  list-style: none;
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.main-nav a {
  display: block;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--text);
  white-space: nowrap;
}
.main-nav a:hover { background: var(--bg-light); text-decoration: none; }

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 4px;
}
.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
}

/* Language toggle */
.lang-toggle { margin-left: auto; }
.lang-toggle a {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-light);
}
.lang-toggle a:hover { background: var(--bg-light); text-decoration: none; }

/* Search */
.search-wrapper { position: relative; }

#search-input {
  font-size: 0.875rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 200px;
  outline: none;
  font-family: inherit;
}
#search-input:focus { border-color: var(--accent); }

.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: none;
  z-index: 200;
  max-height: 400px;
  overflow-y: auto;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.search-results.active { display: block; }

.search-results a {
  display: block;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-size: 0.875rem;
}
.search-results a:last-child { border-bottom: none; }
.search-results a:hover { background: var(--bg-light); text-decoration: none; }

.search-results .no-results {
  padding: 0.5rem 0.75rem;
  color: var(--text-light);
  font-size: 0.875rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 3rem 0 2rem;
}
.hero h1 { font-size: 2rem; margin-bottom: 0.5rem; }
.hero p { color: var(--text-light); font-size: 1.1rem; }

/* Category Grid */
.categories-grid { padding: 1rem 0 2rem; }
.categories-grid h2 { margin-bottom: 1rem; font-size: 1.25rem; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
}

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s;
}
.category-card:hover { border-color: var(--accent); text-decoration: none; }
.category-emoji { font-size: 1.75rem; }
.category-name { font-size: 0.9rem; font-weight: 500; text-align: center; }

/* Articles list */
.latest-articles { padding: 1rem 0 3rem; }
.latest-articles h2 { margin-bottom: 1rem; font-size: 1.25rem; }

.articles-list { display: flex; flex-direction: column; gap: 1rem; }

.article-preview {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.article-preview:last-child { border-bottom: none; }

.article-preview h2,
.article-preview h3 {
  font-size: 1.1rem;
  margin: 0.25rem 0;
}
.article-preview h2 a,
.article-preview h3 a { color: var(--text); }
.article-preview h2 a:hover,
.article-preview h3 a:hover { color: var(--accent); }

.article-preview p {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-light);
}

.article-category {
  background: var(--bg-light);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius);
  font-size: 0.75rem;
}

/* Breadcrumbs */
.breadcrumbs {
  padding: 1rem 0 0.5rem;
  font-size: 0.85rem;
  color: var(--text-light);
}
.breadcrumbs a { color: var(--text-light); }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs .sep { margin: 0 0.35rem; }

/* Single article */
.article-single { padding-bottom: 3rem; }

.article-header { padding: 1rem 0 1.5rem; }
.article-header h1 { font-size: 1.75rem; line-height: 1.3; margin-bottom: 0.75rem; }

.lang-switch {
  margin-top: 0.5rem;
  font-size: 0.85rem;
}
.lang-switch a {
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* TOC */
.toc {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}
.toc summary {
  font-weight: 600;
  cursor: pointer;
  font-size: 0.95rem;
}
.toc ul { margin-top: 0.5rem; padding-left: 1.25rem; }
.toc li { margin: 0.25rem 0; font-size: 0.9rem; }
.toc a { color: var(--text); }
.toc a:hover { color: var(--accent); }

/* Article content */
.article-content h2 {
  font-size: 1.35rem;
  margin: 2rem 0 0.75rem;
  padding-top: 0.5rem;
}
.article-content h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}
.article-content p { margin-bottom: 1rem; }
.article-content ul, .article-content ol {
  margin: 0.5rem 0 1rem 1.5rem;
}
.article-content li { margin: 0.25rem 0; }
.article-content strong { font-weight: 600; }
.article-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  background: var(--bg-light);
  color: var(--text-light);
}

/* Featured image */
.featured-image {
  margin-bottom: 1.5rem;
}
.featured-image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  display: block;
}

/* Inline images in article content */
.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  display: block;
  margin: 1rem 0;
}
.article-content figure {
  margin: 1.5rem 0;
}
.article-content figure img {
  margin: 0;
}
.article-content figcaption {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 0.4rem;
  text-align: center;
}

/* Thumbnail in article preview */
.article-preview.has-thumb {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 1rem;
  align-items: flex-start;
}
.article-thumb {
  flex: 0 0 160px;
  display: block;
  line-height: 0;
}
.article-thumb img {
  width: 160px;
  height: 107px;
  object-fit: cover;
  border-radius: var(--radius);
  display: block;
}
.article-preview-content {
  flex: 1 1 0%;
  min-width: 0;
}

/* Related */
.related-articles {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.related-articles h2 { font-size: 1.1rem; margin-bottom: 0.75rem; }
.related-articles ul { padding-left: 1.25rem; }
.related-articles li { margin: 0.35rem 0; }

/* Section description */
.section-description { margin-bottom: 1.5rem; color: var(--text-light); }

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 2rem 0;
  list-style: none;
}
.pagination li a,
.pagination li span {
  display: block;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: var(--text);
}
.pagination li.active span { background: var(--accent); color: #fff; border-color: var(--accent); }
.pagination li a:hover { background: var(--bg-light); text-decoration: none; }

/* 404 */
.not-found {
  text-align: center;
  padding: 4rem 0;
}
.not-found h1 { font-size: 4rem; color: var(--text-light); }
.not-found p { margin: 0.5rem 0; color: var(--text-light); }
.btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.5rem 1.25rem;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
}
.btn:hover { background: var(--accent-hover); text-decoration: none; color: #fff; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-light);
}

/* Mobile */
@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .main-nav {
    display: none;
    width: 100%;
    order: 10;
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; }
  .main-nav a { padding: 0.5rem 0; }

  #search-input { width: 140px; }

  .hero h1 { font-size: 1.5rem; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .article-header h1 { font-size: 1.35rem; }
  .article-thumb { flex: 0 0 120px; }
  .article-thumb img { width: 120px; height: 80px; }
}

@media (max-width: 480px) {
  .grid { grid-template-columns: 1fr 1fr; gap: 0.5rem; }
  .category-card { padding: 1rem 0.5rem; }
  .category-emoji { font-size: 1.5rem; }
}