*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --black: #0a0a0a;
  --gray: #6b6b6b;
  --light-gray: #e8e8e8;
  --bg: #ffffff;
  --font: -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --max-width: 680px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--black);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ── Layout ── */

.site-header {
  border-bottom: 1px solid var(--light-gray);
  padding: 0 2rem;
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.site-logo {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.site-logo:hover {
  opacity: 0.6;
}

.site-nav {
  display: flex;
  gap: 2rem;
}

.site-nav a {
  font-size: 0.85rem;
  color: var(--gray);
  letter-spacing: 0.01em;
  transition: color 0.15s;
}

.site-nav a:hover {
  color: var(--black);
}

/* ── Nav dropdown ── */

.nav-dropdown {
  position: relative;
  align-self: stretch;
  display: flex;
  align-items: center;
}

.nav-dropdown-toggle {
  font-size: 0.85rem;
  color: var(--gray);
  letter-spacing: 0.01em;
  cursor: default;
  transition: color 0.15s;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-caret {
  font-size: 0.75rem;
  transition: transform 0.15s;
  line-height: 1;
}

.nav-dropdown:hover .nav-dropdown-toggle {
  color: var(--black);
}

.nav-dropdown:hover .nav-caret {
  transform: rotate(-180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--bg);
  border: 1px solid var(--light-gray);
  min-width: 140px;
  z-index: 100;
  display: none;
  flex-direction: column;
}

.nav-dropdown:hover .nav-dropdown-menu {
  display: flex;
}

.nav-dropdown-menu a {
  font-size: 0.85rem;
  color: var(--gray);
  padding: 0.5rem 0.75rem;
  letter-spacing: 0.01em;
  transition: color 0.15s, background 0.15s;
}

.nav-dropdown-menu a:hover {
  color: var(--black);
  background: #f9f9f9;
}

.site-main {
  flex: 1;
  padding: 4rem 2rem;
}

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

.site-footer {
  border-top: 1px solid var(--light-gray);
  padding: 1.5rem 2rem;
}

.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-footer p {
  font-size: 0.8rem;
  color: var(--gray);
}

/* ── Home page ── */

.page-title {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 3rem;
}

.post-list {
  list-style: none;
}

.post-list-item {
  border-top: 1px solid var(--light-gray);
  padding: 1.75rem 0;
}

.post-list-item:last-child {
  border-bottom: 1px solid var(--light-gray);
}

.post-list-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.post-date {
  font-size: 0.8rem;
  color: var(--gray);
  font-variant-numeric: tabular-nums;
}

.post-categories {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.type-tag {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--gray);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
  transition: background 0.15s;
}

.type-tag:hover {
  background: var(--black);
}

.category-tag {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
  border: 1px solid var(--light-gray);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
  transition: border-color 0.15s, color 0.15s;
}

.category-tag:hover {
  color: var(--black);
  border-color: var(--black);
}

.post-list-title {
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 0.35rem;
  transition: opacity 0.15s;
}

.post-list-item a:hover .post-list-title {
  opacity: 0.5;
}

.post-list-description {
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.5;
}

.post-author {
  font-size: 0.8rem;
  color: var(--gray);
  margin-top: 0.4rem;
}

/* ── Post page ── */

.post-header {
  margin-bottom: 3rem;
}

.post-header-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.post-title {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.post-description {
  font-size: 1rem;
  color: var(--gray);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.post-byline {
  font-size: 0.8rem;
  color: var(--gray);
}

.post-divider {
  border: none;
  border-top: 1px solid var(--light-gray);
  margin-bottom: 3rem;
}

/* ── Post content typography ── */

.post-content {
  font-size: 1rem;
  line-height: 1.75;
}

.post-content h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 2.5rem 0 0.75rem;
  letter-spacing: -0.01em;
}

.post-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 2rem 0 0.5rem;
}

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

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

.post-content li {
  margin-bottom: 0.3rem;
}

.post-content blockquote {
  border-left: 2px solid var(--black);
  margin: 1.5rem 0;
  padding: 0.25rem 0 0.25rem 1.5rem;
  color: var(--gray);
  font-style: italic;
}

.post-content code {
  font-family: "SF Mono", "Fira Code", "Courier New", monospace;
  font-size: 0.85em;
  background: #f5f5f5;
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.post-content pre {
  background: #f5f5f5;
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.25rem;
  border-radius: 4px;
}

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

.post-content a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--light-gray);
  transition: text-decoration-color 0.15s;
}

.post-content a:hover {
  text-decoration-color: var(--black);
}

.post-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2rem 0;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--light-gray);
  margin: 2.5rem 0;
}

/* ── Category page ── */

.category-header {
  margin-bottom: 3rem;
}

.category-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 0.5rem;
}

.category-title {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.category-count {
  font-size: 0.85rem;
  color: var(--gray);
  margin-top: 0.5rem;
}

/* ── Links page ── */

.link-list {
  list-style: none;
}

.link-list-item {
  border-top: 1px solid var(--light-gray);
  padding: 1.25rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.link-list-item:last-child {
  border-bottom: 1px solid var(--light-gray);
}

.link-item-main {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.link-item-title {
  font-size: 1rem;
  font-weight: 500;
  transition: opacity 0.15s;
}

.link-item-title:hover {
  opacity: 0.5;
}

.link-item-description {
  font-size: 0.85rem;
  color: var(--gray);
}

.link-item-visit {
  font-size: 0.8rem;
  color: var(--gray);
  white-space: nowrap;
  transition: color 0.15s;
  flex-shrink: 0;
}

.link-item-visit:hover {
  color: var(--black);
}

.redirect-message {
  color: var(--gray);
  font-size: 0.9rem;
}

/* ── Back link ── */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--gray);
  margin-bottom: 3rem;
  transition: color 0.15s;
}

.back-link:hover {
  color: var(--black);
}

.back-link::before {
  content: "←";
}

/* ── Empty state ── */

.empty-state {
  padding: 4rem 0;
  text-align: center;
  color: var(--gray);
  font-size: 0.9rem;
}

/* ── Responsive ── */

@media (max-width: 640px) {
  .site-header {
    padding: 0 1.25rem;
  }

  .site-main {
    padding: 2.5rem 1.25rem;
  }

  .site-footer {
    padding: 1.25rem;
  }

  .post-title {
    font-size: 1.6rem;
  }
}