:root {
  --bg: #0d0d0d;
  --bg-tint: #131313;
  --border: #222222;
  --text: #d4d4d4;
  --text-strong: #f0f0f0;
  --text-muted: #777777;
  --accent: #c8f135;
  --accent-dim: rgba(200, 241, 53, 0.12);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Lora', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;

  --max-page: 1140px;
  --max-reading: 760px;
}

[data-theme="light"] {
  --bg: #fbfbf9;
  --bg-tint: #f2f2ee;
  --border: #e0e0dc;
  --text: #2f2f2f;
  --text-strong: #111111;
  --text-muted: #7a7a7a;
  --accent: #5c7c00;
  --accent-dim: rgba(92, 124, 0, 0.08);
}

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

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.7;
}

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

::selection {
  background: var(--accent);
  color: #000;
}

.blog-nav {
  max-width: var(--max-page);
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--border);
}

.blog-nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.blog-nav-link {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.blog-nav-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

#themeBtn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.34rem 0.62rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

#themeBtn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.toc-toggle-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.34rem 0.62rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.toc-toggle-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.toc-toggle-btn[aria-pressed="true"] {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

.blog-page,
.post-page {
  max-width: var(--max-page);
  margin: 0 auto;
  padding: 2.2rem 1.25rem 4rem;
}

.eyebrow {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.13em;
}

h1 {
  margin: 0 0 1.1rem;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.08;
  color: var(--text-strong);
}

.lead {
  margin: 0 0 2rem;
  max-width: 66ch;
  font-size: 1.03rem;
  color: var(--text-muted);
}

.blog-toolbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.blog-search-wrap {
  width: min(540px, 100%);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.blog-search-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.blog-search-input {
  width: 100%;
  background: var(--bg);
  color: var(--text-strong);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.64rem 0.75rem;
  font-size: 0.9rem;
}

.blog-search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.blog-result-count {
  margin: 0;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.blog-status {
  margin: 0 0 1rem;
  min-height: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  opacity: 0;
}

.blog-status.active {
  opacity: 1;
}

.blog-status.error {
  color: #f87171;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--border);
}

.blog-card {
  padding: 1.9rem 1.8rem 2rem 0;
  border-bottom: 1px solid var(--border);
}

.blog-card:not(:last-child) {
  border-right: 1px solid var(--border);
  padding-right: 2rem;
}

.blog-card:not(:first-child) {
  padding-left: 2rem;
}

.blog-meta {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.blog-card h2 {
  margin: 0 0 0.7rem;
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--text-strong);
}

.blog-card h3 {
  margin: 0 0 0.8rem;
  font-family: var(--font-serif);
  font-size: 1.12rem;
  line-height: 1.34;
  color: var(--text-strong);
}

.blog-card p {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.tag-row,
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
  margin: 0 0 1rem;
}

.tag,
.post-tag {
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 0.18rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.blog-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.blog-link:hover {
  border-color: var(--accent);
}

.blog-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 2rem 0;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.post-article {
  max-width: var(--max-page);
  margin: 0 auto;
}

.post-layout {
  display: grid;
  grid-template-columns: 180px minmax(0, var(--max-reading));
  justify-content: center;
  gap: 1.25rem;
  align-items: start;
}

.post-layout.toc-hidden {
  grid-template-columns: minmax(0, var(--max-reading));
}

.post-layout.toc-hidden .toc-squircle {
  display: none;
}

.post-main {
  max-width: none;
  width: 100%;
}

.toc-squircle {
  position: sticky;
  top: 5.4rem;
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 0.75rem;
  margin-left: -2.2rem;
  background: linear-gradient(160deg, var(--bg-tint), transparent 78%);
}

.toc-title {
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.09em;
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.26rem;
  max-height: calc(100vh - 9rem);
  overflow: auto;
}

.toc-item {
  margin: 0;
}

.toc-link {
  display: block;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.26rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  line-height: 1.35;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.toc-link:hover {
  color: var(--text-strong);
  border-color: var(--border);
}

.toc-link.active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

.toc-item.depth-3 .toc-link {
  padding-left: 0.9rem;
  font-size: 0.64rem;
}

.toc-item.depth-4 .toc-link {
  padding-left: 1.2rem;
  font-size: 0.63rem;
}

.post-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
  margin-bottom: 1.6rem;
}

.post-meta {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.post-title {
  margin: 0 0 0.9rem;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.16;
  color: var(--text-strong);
}

.post-excerpt {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.9;
}

.post-body {
  color: var(--text);
}

.post-body h1,
.post-body h2,
.post-body h3,
.post-body h4 {
  margin-top: 2rem;
  margin-bottom: 0.8rem;
  font-family: var(--font-serif);
  color: var(--text-strong);
}

.post-body h2 {
  font-size: 1.65rem;
  scroll-margin-top: 6rem;
}

.post-body h3 {
  font-size: 1.3rem;
  scroll-margin-top: 6rem;
}

.post-body h4 {
  scroll-margin-top: 6rem;
}

.post-body p,
.post-body li {
  font-size: 1.03rem;
  line-height: 1.95;
  color: var(--text);
}

.post-body ul,
.post-body ol {
  margin: 0 0 1.2rem 1.35rem;
}

.post-body blockquote {
  margin: 1.4rem 0;
  padding: 0.8rem 1rem;
  border-left: 2px solid var(--accent);
  background: var(--accent-dim);
  color: var(--text-muted);
}

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-tint);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.09rem 0.34rem;
}

.post-body pre {
  margin: 1.3rem 0;
  background: var(--bg-tint);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.9rem;
  overflow-x: auto;
}

.post-body pre code {
  border: none;
  background: none;
  padding: 0;
}

.related-section {
  margin-top: 2.4rem;
  border-top: 1px solid var(--border);
  padding-top: 1.1rem;
}

.related-section h2 {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--accent);
}

.related-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.related-card {
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.7rem;
  transition: border-color 0.2s, background 0.2s;
}

.related-card:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.related-title {
  display: block;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text-strong);
  margin-bottom: 0.3rem;
}

.related-meta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

@media (max-width: 920px) {
  .blog-grid {
    grid-template-columns: 1fr;
  }

  .blog-card,
  .blog-card:not(:last-child),
  .blog-card:not(:first-child) {
    border-right: none;
    padding: 1.7rem 0;
  }

  .blog-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .blog-search-wrap {
    width: 100%;
  }

  .related-list {
    grid-template-columns: 1fr;
  }

  .post-layout {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  .post-main {
    max-width: 100%;
  }

  .toc-squircle {
    position: static;
    margin-left: 0;
    border-radius: 22px;
  }

  .toc-list {
    max-height: none;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .blog-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .blog-nav-right {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .post-body p,
  .post-body li,
  .post-excerpt {
    font-size: 1rem;
    line-height: 1.85;
  }

  .toc-list {
    grid-template-columns: 1fr;
  }
}