:root {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, monospace;
  --text: #111;
  --text-secondary: #666;
  --bg: #fff;
  --link: #111;
  --link-hover: #555;
  --border: #eaeaea;
  --green: #059669;
  --green-bg: #d1fae5;
  --red: #dc2626;
  --red-bg: #fee2e2;
  --orange: #d97706;
  --orange-bg: #fef3c7;
  --blue-bg: #dbeafe;
  --purple-bg: #f3e8ff;
  --code-bg: #f5f5f5;
  --max-width: 640px;
}

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

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
  padding: 48px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: #ccc;
}

a:hover {
  color: var(--link-hover);
  text-decoration-color: var(--link-hover);
}

nav {
  margin-bottom: 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .name {
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  color: var(--text);
}

nav .name:hover {
  color: var(--text-secondary);
}

nav .avatar {
  width: 48px;
  height: 48px;
  border-radius: 4px;
  object-fit: cover;
}

nav .links {
  margin-top: 4px;
}

nav .links a {
  font-size: 14px;
  color: var(--text-secondary);
  margin-right: 16px;
}

nav .links a:hover {
  color: var(--text);
}

h1 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
}

p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-size: 15px;
}

.about p a {
  color: var(--text-secondary);
}

.about p a:hover {
  color: var(--text);
}

/* Blog listing */
.posts {
  list-style: none;
}

.posts li {
  margin-bottom: 12px;
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.posts time {
  font-size: 14px;
  color: #999;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  min-width: 80px;
}

.posts a {
  font-size: 15px;
}

/* Blog post */
article {
  line-height: 1.7;
}

article h1 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

article .meta {
  font-size: 14px;
  color: #999;
  margin-bottom: 32px;
}

article h2 {
  font-size: 17px;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
}

article p {
  margin-bottom: 16px;
  font-size: 15px;
  color: var(--text);
}

article a {
  color: var(--text);
  text-decoration-color: #999;
}

article a:hover {
  text-decoration-color: var(--text);
}

article ul, article ol {
  margin-bottom: 16px;
  padding-left: 20px;
  font-size: 15px;
}

article li {
  margin-bottom: 6px;
}

article blockquote {
  border-left: 2px solid var(--border);
  padding-left: 16px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-style: italic;
}

article h3 {
  font-size: 15px;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 10px;
}

article .subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.6;
}

article code {
  font-family: var(--mono);
  font-size: 14px;
  background: #f5f5f5;
  padding: 2px 5px;
  border-radius: 3px;
}

article pre {
  background: #f5f5f5;
  padding: 16px;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 16px;
}

article pre code {
  background: none;
  padding: 0;
}

article img {
  max-width: 100%;
  border-radius: 4px;
  margin: 8px 0;
}

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: #999;
}

/* Table of contents */
.toc {
  position: fixed;
  top: 48px;
  left: calc((100vw - var(--max-width)) / 2 + var(--max-width) + 32px);
  width: 200px;
  font-size: 12px;
  line-height: 1.5;
  display: none;
}

@media (min-width: 1060px) {
  .toc { display: block; }
}

.toc-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.toc ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc li {
  margin-bottom: 6px;
}

.toc li.toc-h3 {
  padding-left: 12px;
}

.toc a {
  color: #999;
  text-decoration: none;
  transition: color 0.15s;
}

.toc a:hover {
  color: var(--text);
}

.toc a.active {
  color: var(--text);
  font-weight: 500;
}

/* Tables */
article table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}

article th {
  text-align: left;
  font-weight: 600;
  padding: 8px 10px;
  border-bottom: 2px solid var(--text);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

article td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--border);
}

article tr:hover td {
  background: var(--code-bg);
}

.num {
  text-align: right;
  font-family: var(--mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 3px;
}

.tag-green { background: var(--green-bg); color: #065f46; }
.tag-red { background: var(--red-bg); color: #991b1b; }

/* Audio blocks */
.audio-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
}

.audio-block audio {
  width: 100%;
  margin: 10px 0;
  border-radius: 6px;
}

.audio-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.badge {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--blue-bg);
  color: #2563eb;
}

.audio-title {
  font-weight: 600;
  font-size: 14px;
}

.listen-hint {
  font-size: 13px;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 8px;
}

.audio-source {
  font-size: 12px;
  color: #999;
  margin-bottom: 8px;
}

.audio-source a {
  color: #999;
  text-decoration-color: #ccc;
}

.audio-source a:hover {
  color: var(--text-secondary);
}

/* Diff comparisons */
.diff {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin: 12px 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.diff-side {
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.65;
}

.diff-side:first-child {
  border-right: 1px solid var(--border);
}

.diff-label {
  font-family: var(--font);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: 6px;
  display: block;
}

.diff-3col {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0;
  margin: 12px 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.diff-3col > div {
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
}

.diff-3col > div:not(:last-child) {
  border-right: 1px solid var(--border);
}

.diff-3col .bg-red { background: #fef2f2; }
.diff-3col .bg-blue { background: var(--blue-bg); }

@media (max-width: 640px) {
  .diff { grid-template-columns: 1fr; }
  .diff-side:first-child { border-right: none; border-bottom: 1px solid var(--border); }
  .diff-3col { grid-template-columns: 1fr; }
  .diff-3col > div:not(:last-child) { border-right: none; border-bottom: 1px solid var(--border); }
}

/* Diff highlights */
.d { background: var(--orange-bg); padding: 1px 3px; border-radius: 3px; border-bottom: 2px solid #ca8a04; }
.d-add { background: var(--green-bg); padding: 1px 3px; border-radius: 3px; border-bottom: 2px solid var(--green); }
.d-del { background: var(--red-bg); padding: 1px 3px; border-radius: 3px; border-bottom: 2px solid var(--red); }

.hi-green { background: var(--green-bg); padding: 1px 3px; border-radius: 3px; font-weight: 600; }
.hi-red { background: var(--red-bg); padding: 1px 3px; border-radius: 3px; font-weight: 600; }
.hi-yellow { background: var(--orange-bg); padding: 1px 3px; border-radius: 3px; }
.hi-purple { background: var(--purple-bg); padding: 1px 3px; border-radius: 3px; }
.hi-blue { background: var(--blue-bg); padding: 1px 3px; border-radius: 3px; }

.dim { color: #9ca3af; }

/* Legend */
.legend {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 8px 0 4px;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.swatch {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

/* Code example block */
.example {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
  background: var(--code-bg);
  padding: 16px;
  border-radius: 6px;
  margin: 12px 0;
  white-space: pre-wrap;
}

/* Inline note under audio blocks */
.audio-block .note {
  font-size: 13px;
  margin: 10px 0 0;
}