/* === RESET & BASE === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f9f9f9;
  color: #111;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* === LAYOUT === */
header, main, footer {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

header {
  padding-top: 2rem;
  padding-bottom: 2rem;
}

main {
  flex: 1;
  padding-bottom: 4rem;
}

footer {
  padding: 2rem 1.5rem;
  color: #666;
  font-size: 0.85rem;
}

/* === HEADER === */
.logo {
  font-size: 1.1rem;
  font-weight: 600;
  color: #111;
  text-decoration: none;
}

/* === ARTICLE LIST (home) === */
.article-list {
  list-style: none;
}

.article-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid #e0e0e0;
}

.article-item:last-child {
  border-bottom: none;
}

.article-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.article-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: #111;
}

.article-date {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 0.5rem;
}

.article-excerpt {
  color: #444;
  font-size: 0.95rem;
}

/* === ARTICLE VIEW === */
.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #e0e0e0;
}

.article-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

.back-link {
  display: inline-block;
  margin-bottom: 1.5rem;
  color: #666;
  text-decoration: none;
  font-size: 0.9rem;
}

.back-link:hover {
  color: #111;
}

/* === ARTICLE CONTENT (Markdown) === */
.article-content h1,
.article-content h2,
.article-content h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
  line-height: 1.3;
}

.article-content h1 { font-size: 1.6rem; }
.article-content h2 { font-size: 1.35rem; }
.article-content h3 { font-size: 1.15rem; }

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content a {
  color: #0066cc;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 0.4rem;
}

.article-content blockquote {
  border-left: 3px solid #ddd;
  padding-left: 1rem;
  margin: 1.5rem 0;
  color: #555;
  font-style: italic;
}

.article-content code {
  font-family: "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.88em;
  background: #eee;
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.article-content pre {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.article-content pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  color: inherit;
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 1rem 0;
}

.article-content hr {
  border: none;
  border-top: 1px solid #ddd;
  margin: 2rem 0;
}

/* === STATES === */
.loading {
  color: #666;
}

.error {
  color: #c00;
}

/* === LIGHTBOX === */
.article-content img {
  cursor: pointer;
}

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  cursor: pointer;
  padding: 1rem;
}

.lightbox img {
  max-width: 95%;
  max-height: 95vh;
  object-fit: contain;
  border-radius: 4px;
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  color: #fff;
  font-size: 2rem;
  font-weight: 300;
  line-height: 1;
}

/* === RESPONSIVE === */
@media (min-width: 600px) {
  html {
    font-size: 19px;
  }

  header {
    padding-top: 3rem;
    padding-bottom: 2.5rem;
  }

  .article-header h1 {
    font-size: 2.1rem;
  }
}