:root {
  --bg: #ffffff;
  --fg: #0d0d0d;
  --muted: #767676;
  --line: rgba(0, 0, 0, 0.12);
  --line-strong: rgba(0, 0, 0, 0.22);
  --accent: #1c75be;
  --hover: rgba(28, 117, 190, 0.06);
  --tag-bg: rgba(28, 117, 190, 0.08);
  --tag-text: #1c75be;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1116;
    --fg: #edf2f7;
    --muted: #98a2ac;
    --line: rgba(237, 242, 247, 0.12);
    --line-strong: rgba(237, 242, 247, 0.22);
    --accent: #79afe2;
    --hover: rgba(121, 175, 226, 0.08);
    --tag-bg: rgba(121, 175, 226, 0.14);
    --tag-text: #9bc5ef;
    color-scheme: dark;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 19px;
  line-height: 1.45;
  transition: background-color 260ms ease, color 260ms ease;
}

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

.page-shell {
  min-height: 100vh;
  max-width: 1220px;
  margin: 0 auto;
  padding: 46px 22px 28px;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 42px;
}

.site-header__copy {
  max-width: 560px;
}

.site-kicker {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-title,
.post-title {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.35rem);
  line-height: 0.96;
  letter-spacing: -0.05em;
  font-weight: 760;
}

.site-title--compact {
  font-size: clamp(1.1rem, 1.8vw, 1.45rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.site-summary {
  margin: 14px 0 0;
  max-width: 35ch;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.55;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.8rem;
  color: var(--muted);
}

.site-nav a,
.site-title-link,
.site-footer__links a,
.card-title a,
.post-body a,
.back-link,
.side-list a {
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus,
.site-title-link:hover,
.site-title-link:focus,
.site-footer__links a:hover,
.site-footer__links a:focus,
.card-title a:hover,
.card-title a:focus,
.post-body a:hover,
.post-body a:focus,
.back-link:hover,
.back-link:focus,
.side-list a:hover,
.side-list a:focus {
  color: var(--accent);
  border-color: var(--line-strong);
  outline: none;
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 720px) minmax(240px, 320px);
  gap: 52px;
  align-items: start;
}

.main-content {
  min-width: 0;
}

.side-panel {
  position: sticky;
  top: 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.side-block {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.side-label {
  margin-bottom: 8px;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.03em;
  text-transform: lowercase;
}

.side-text,
.side-list {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.92rem;
  line-height: 1.55;
}

.side-list li + li {
  margin-top: 0.45rem;
}

.side-list--tags li {
  display: flex;
  gap: 10px;
  align-items: baseline;
}

.tag-count {
  color: var(--muted);
  font-size: 0.86em;
}

.intro-note {
  margin: 0 0 1.2rem;
  color: var(--muted);
  max-width: 34ch;
}

.filters {
  display: grid;
  grid-template-columns: minmax(0, 2fr) repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 22px;
}

.filters input,
.filters select,
.filters button {
  width: 100%;
  min-width: 0;
  height: 42px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  font-size: 0.9rem;
}

.filters button {
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.filters button:hover,
.filters button:focus,
.filters input:focus,
.filters select:focus {
  background: var(--hover);
  border-color: var(--line-strong);
  outline: none;
}

.hidden {
  display: none;
}

.info-alert {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 0.92rem;
}

.post-cards {
  display: flex;
  flex-direction: column;
}

.post-card {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.post-card:first-child {
  border-top: 1px solid var(--line-strong);
}

.card-date,
.meta {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.84rem;
}

.card-title {
  margin: 0;
  font-size: 1.16rem;
  line-height: 1.28;
  font-weight: 640;
  letter-spacing: -0.02em;
}

.card-tags,
.tags {
  margin: 10px 0 0;
}

.tag {
  display: inline-block;
  margin: 0 6px 6px 0;
  padding: 2px 7px;
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.72rem;
  border-radius: 999px;
}

.post {
  max-width: 760px;
}

.back-link {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 0.84rem;
}

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

.post-body h2,
.post-body h3,
.post-body h4 {
  margin-top: 2.2rem;
  margin-bottom: 0.6rem;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.post-body p,
.post-body ul,
.post-body ol,
.post-body blockquote {
  margin: 0 0 1.1rem;
}

.post-body ul,
.post-body ol {
  padding-left: 1.3rem;
}

.post-body blockquote {
  margin-left: 0;
  padding-left: 1rem;
  border-left: 2px solid var(--line);
  color: var(--muted);
}

pre {
  overflow: auto;
  padding: 1rem;
  background: #f7f9fb;
  border: 1px solid rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  pre {
    background: #111720;
    border-color: rgba(237, 242, 247, 0.08);
  }
}

code,
pre code {
  font-family: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 0.18rem 0.45rem;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--muted);
  font: inherit;
  font-size: 0.74rem;
  cursor: pointer;
}

.copy-btn:hover {
  color: var(--fg);
  border-color: var(--line-strong);
}

.site-footer {
  margin-top: 42px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--muted);
}

@media (max-width: 980px) {
  .page-shell {
    padding: 28px 18px 24px;
  }

  .page-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .side-panel {
    position: static;
    order: 2;
    gap: 20px;
  }

  .site-header {
    flex-direction: column;
    gap: 18px;
    margin-bottom: 28px;
  }

  .filters {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 18px;
  }

  .site-title,
  .post-title {
    font-size: 2rem;
  }

  .site-title--compact {
    font-size: 1.15rem;
  }

  .filters {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
    gap: 8px;
  }
}