:root {
  color-scheme: light dark;
  --bg: #fbfaf8;
  --text: #1f2328;
  --muted: #6b7280;
  --border: #e6e3de;
  --accent: #1d4ed8;
  --danger: #b42318;
  --code-bg: #f2f1ee;
  --quote-bg: #f6f5f2;
  --max-width: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --text: #e8e6e3;
    --muted: #9ca3af;
    --border: #2a2e33;
    --accent: #8ab4ff;
    --danger: #ff8a80;
    --code-bg: #1f2328;
    --quote-bg: #1b1e22;
  }
}

* {
  box-sizing: border-box;
}

html {
  font-size: 17px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

.page {
  width: min(100% - 2.5rem, var(--max-width));
  margin: 0 auto;
  padding: 4rem 0 6rem;
}

.site-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.site-header h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.subtitle {
  margin: 0.6rem 0 0;
  color: var(--muted);
}

.status {
  margin: 0 0 1rem;
  color: var(--muted);
}

.status.error {
  color: var(--danger);
}

.article-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--border);
}

.article-list li {
  border-bottom: 1px solid var(--border);
}

.article-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0.25rem;
  color: var(--text);
  text-decoration: none;
  font-variant-numeric: tabular-nums;
}

.article-link::after {
  content: "→";
  color: var(--muted);
  font-size: 1.1rem;
}

.article-link:hover,
.article-link:focus-visible {
  color: var(--accent);
}

.article-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.back {
  margin-bottom: 2.5rem;
  font-size: 0.9rem;
}

.back a {
  color: var(--muted);
  text-decoration: none;
}

.back a:hover {
  color: var(--accent);
}

.article-header {
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.article-header h1 {
  margin: 0;
  font-size: clamp(1.9rem, 4.5vw, 2.5rem);
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 1rem;
  margin: 0.9rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.meta-item {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.meta-key {
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chip {
  padding: 0.05rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-size: 0.78rem;
}

.markdown-body {
  margin-top: 2rem;
  overflow-wrap: break-word;
}

.markdown-body > :first-child {
  margin-top: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  margin: 2.2rem 0 0.75rem;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.markdown-body h1 {
  font-size: 1.9rem;
}

.markdown-body h2 {
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
  font-size: 1.45rem;
}

.markdown-body h3 {
  font-size: 1.2rem;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body pre,
.markdown-body table {
  margin: 1rem 0;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.5rem;
}

.markdown-body li + li {
  margin-top: 0.3rem;
}

.markdown-body blockquote {
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--border);
  border-radius: 0 0.35rem 0.35rem 0;
  background: var(--quote-bg);
  color: var(--muted);
}

.markdown-body blockquote > :first-child {
  margin-top: 0;
}

.markdown-body blockquote > :last-child {
  margin-bottom: 0;
}

.markdown-body code {
  padding: 0.12em 0.35em;
  border-radius: 0.3rem;
  background: var(--code-bg);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono",
    monospace;
  font-size: 0.88em;
}

.markdown-body pre {
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 0.55rem;
  background: var(--code-bg);
  line-height: 1.55;
  overflow-x: auto;
}

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

.markdown-body table {
  display: block;
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  overflow-x: auto;
}

.markdown-body th,
.markdown-body td {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  text-align: left;
}

.markdown-body th {
  background: var(--code-bg);
  font-weight: 600;
}

.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: 0.45rem;
}

.markdown-body hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 1px solid var(--border);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  border: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

@media (max-width: 600px) {
  html {
    font-size: 16px;
  }

  .page {
    width: min(100% - 2rem, var(--max-width));
    padding: 2.5rem 0 4rem;
  }
}