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

:root {
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border-color: #eeeeee;
  --bg-primary: #ffffff;
  --bg-secondary: #f9f9f9;
  --bg-code: #f5f5f5;
  --link-color: #0066cc;
  --link-hover: #0052a3;
  --max-width: 800px;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.7;
  font-size: 1rem;
}

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

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* ===== HEADER ===== */
.site-header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.site-header .logo {
  display: inline-block;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
}

.site-header .logo img {
  height: 50px;
  width: auto;
  display: block;
}

@media (max-width: 767px) {
  .site-header .logo img {
    height: 38px;
  }
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  margin-top: 4rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.footer-brand-text {
  font-weight: 700;
  text-transform: uppercase;
  font-size: 1rem;
}

.footer-divider {
  border: none;
  border-top: 2px solid var(--border-color);
  margin: 1rem 0;
}

.footer-social {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
}

.footer-social a {
  display: inline-block;
  transition: opacity 0.2s;
}

.footer-social a:hover {
  opacity: 0.7;
}

.footer-social img {
  display: block;
}

/* ===== ARTICLE PAGE ===== */
.article-page {
  padding: 2rem 0 4rem;
}

@media (max-width: 767px) {
  .article-page {
    padding: 1rem 0 2rem;
  }
}

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

.article-header h1 {
  font-size: 2em;
  line-height: 1.2;
  margin-bottom: 1rem;
  font-weight: 700;
}

@media (max-width: 767px) {
  .article-header h1 {
    font-size: 1.5em;
  }
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.article-meta a {
  color: var(--text-secondary);
  text-decoration: none;
}

.article-meta a:hover {
  color: var(--link-color);
}

.article-meta-separator {
  color: var(--text-muted);
}

/* ===== FEATURED IMAGE ===== */
.featured-image {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 2rem 0;
  display: block;
}

/* ===== ARTICLE CONTENT ===== */
.article-content {
  font-size: 1.125rem;
  line-height: 1.7;
}

@media (max-width: 767px) {
  .article-content {
    font-size: 1rem;
  }
}

.article-content > * {
  margin-bottom: 1.5rem;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  line-height: 1.3;
  font-weight: 600;
}

.article-content h1 { font-size: 1.75em; }
.article-content h2 { font-size: 1.5em; }
.article-content h3 { font-size: 1.25em; }
.article-content h4 { font-size: 1.1em; }

.article-content p {
  margin-bottom: 1.5rem;
}

.article-content a {
  color: var(--link-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-bottom 0.2s;
}

.article-content a:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 1.5rem 0;
  display: block;
}

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

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

.article-content blockquote {
  border-left: 4px solid var(--link-color);
  padding-left: 1rem;
  margin: 1.5rem 0;
  color: var(--text-secondary);
  font-style: italic;
}

.article-content pre {
  background: var(--bg-code);
  padding: 1rem;
  border-radius: 4px;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

.article-content code {
  background: var(--bg-code);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: Monaco, Consolas, 'Courier New', monospace;
  font-size: 0.9em;
}

.article-content pre code {
  background: none;
  padding: 0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  overflow-x: auto;
  display: block;
}

@media (min-width: 768px) {
  .article-content table {
    display: table;
  }
}

.article-content th,
.article-content td {
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.article-content th {
  background: var(--bg-secondary);
  font-weight: 600;
}

.article-content hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2rem 0;
}

/* ===== PROFILE PAGE ===== */
.profile-page {
  padding: 2rem 0;
}

.profile-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.profile-header h1 {
  font-size: 2em;
  margin-bottom: 0.5rem;
}

.profile-stats {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.article-card {
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

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

.article-card h2 {
  font-size: 1.5em;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

@media (max-width: 767px) {
  .article-card h2 {
    font-size: 1.25em;
  }
}

.article-card h2 a {
  color: var(--text-primary);
  text-decoration: none;
}

.article-card h2 a:hover {
  color: var(--link-color);
}

.article-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

.article-card-excerpt {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== INDEX PAGE ===== */
.index-page {
  padding: 2rem 0;
}

.page-header {
  margin-bottom: 3rem;
  text-align: center;
}

.page-header h1 {
  font-size: 2.5em;
  margin-bottom: 0.5rem;
}

@media (max-width: 767px) {
  .page-header h1 {
    font-size: 2em;
  }
}

.page-header .subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* ===== UTILITIES ===== */
.text-muted {
  color: var(--text-muted);
}

/* ===== ACCESSIBILITY ===== */
a:focus,
button:focus {
  outline: 2px solid var(--link-color);
  outline-offset: 2px;
}

/* Skip to content link for screen readers */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--link-color);
  color: white;
  padding: 0.5rem 1rem;
  text-decoration: none;
  z-index: 100;
}

.skip-to-content:focus {
  top: 0;
}

/* ===== PRINT STYLES ===== */
@media print {
  .site-header,
  .site-footer {
    display: none;
  }

  body {
    font-size: 12pt;
    color: black;
  }

  a {
    text-decoration: underline;
  }

  .article-content img {
    max-width: 100%;
    page-break-inside: avoid;
  }
}