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

:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --sidebar-bg: #f9fafb;
  --header-bg: #ffffff;
  --tag-bg: #f3f4f6;
  --font-body: 'Georgia', 'Times New Roman', serif;
  --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }

/* === Header === */
#masthead {
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  padding: 0 20px;
}
.site-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 20px;
}
.site-branding { display: flex; flex-direction: column; gap: 2px; }
.site-title {
  font-family: var(--font-ui);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}
.site-title:hover { color: var(--accent); text-decoration: none; }
.site-description {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--muted);
}
nav.main-nav { font-family: var(--font-ui); }
nav.main-nav ul { list-style: none; display: flex; gap: 24px; }
nav.main-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}
nav.main-nav a:hover { color: var(--accent); text-decoration: none; }

/* === Layout === */
#page { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
#content { display: flex; gap: 48px; padding: 36px 0 60px; }
#primary { flex: 1; min-width: 0; }
#secondary { width: 280px; flex-shrink: 0; }

/* === Article === */
article.post {}
.entry-header { margin-bottom: 28px; }

.entry-meta-top {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.entry-meta-top .sep { color: var(--border); }
.entry-meta-top a { color: var(--muted); }
.entry-meta-top a:hover { color: var(--accent); }

.entry-title {
  font-family: var(--font-ui);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
  letter-spacing: -0.02em;
}
.entry-title a { color: inherit; }
.entry-title a:hover { color: var(--accent); text-decoration: none; }

.entry-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #111827;
}
.entry-content p { margin-bottom: 1.3em; }
.entry-content h2 {
  font-family: var(--font-ui);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 2em 0 0.7em;
  color: var(--text);
  letter-spacing: -0.01em;
}
.entry-content h3 {
  font-family: var(--font-ui);
  font-size: 1.1rem;
  font-weight: 700;
  margin: 1.6em 0 0.5em;
  color: var(--text);
}
.entry-content ul, .entry-content ol {
  padding-left: 1.6em;
  margin-bottom: 1.3em;
}
.entry-content li { margin-bottom: 0.4em; }
.entry-content strong { font-weight: 700; color: #111; }

.entry-content table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  margin-bottom: 1.6em;
}
.entry-content th {
  background: #f3f4f6;
  padding: 10px 14px;
  text-align: left;
  font-weight: 700;
  border: 1px solid var(--border);
}
.entry-content td {
  padding: 9px 14px;
  border: 1px solid var(--border);
}
.entry-content tr:nth-child(even) td { background: #fafafa; }

.entry-content blockquote {
  border-left: 4px solid var(--accent);
  padding: 14px 20px;
  margin: 1.6em 0;
  background: #f0f7ff;
  font-style: italic;
  color: #374151;
  border-radius: 0 6px 6px 0;
}

/* === Entry Footer (meta) === */
.entry-footer {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 36px;
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.entry-footer .tags a, .entry-footer .cats a {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 10px;
  font-size: 0.78rem;
  margin: 2px 3px 2px 0;
}
.entry-footer .tags a:hover, .entry-footer .cats a:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  text-decoration: none;
}

/* === Post list (index) === */
.post-card {
  border-bottom: 1px solid var(--border);
  padding-bottom: 36px;
  margin-bottom: 36px;
}
.post-card:last-child { border-bottom: none; }
.post-card .entry-title { font-size: 1.5rem; margin-bottom: 6px; }
.post-card .excerpt {
  font-size: 0.98rem;
  color: #374151;
  margin-bottom: 14px;
}
.read-more {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

/* === Sidebar === */
#secondary {
  font-family: var(--font-ui);
}
.widget {
  margin-bottom: 32px;
}
.widget-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-bottom: 2px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 14px;
}
.widget ul { list-style: none; }
.widget ul li {
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.widget ul li:last-child { border-bottom: none; }
.widget ul a { color: var(--text); font-size: 0.88rem; }
.widget ul a:hover { color: var(--accent); }

/* Search widget */
.search-form {
  display: flex;
  gap: 0;
}
.search-form input[type="text"] {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-right: none;
  border-radius: 4px 0 0 4px;
  font-size: 0.88rem;
  outline: none;
  font-family: var(--font-ui);
}
.search-form input[type="text"]:focus { border-color: var(--accent); }
.search-form button {
  padding: 8px 14px;
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
  border-radius: 0 4px 4px 0;
  cursor: pointer;
  font-size: 0.88rem;
  font-family: var(--font-ui);
}
.search-form button:hover { background: var(--accent-hover); }

/* === Breadcrumb === */
.breadcrumb {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--muted);
  padding: 10px 0 0;
  margin-bottom: -16px;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { margin: 0 6px; color: #d1d5db; }

/* === Footer === */
#colophon {
  border-top: 1px solid var(--border);
  padding: 20px;
  text-align: center;
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--muted);
}
#colophon a { color: var(--muted); }
#colophon a:hover { color: var(--accent); }

/* === Responsive === */
@media (max-width: 780px) {
  #content { flex-direction: column; }
  #secondary { width: 100%; }
  .entry-title { font-size: 1.5rem; }
  .site-header-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
  nav.main-nav ul { gap: 16px; flex-wrap: wrap; }
}