:root {
  --maxw: 1120px;
  --radius-card: 20px;
  --radius-shell: 26px;
  --radius-pill: 999px;
  --font-body: "Manrope", sans-serif;
  --font-display: "Newsreader", serif;

  --bg: #f7fafc;
  --bg-shape-a: rgba(53, 125, 234, 0.2);
  --bg-shape-b: rgba(10, 150, 141, 0.16);
  --surface: rgba(255, 255, 255, 0.9);
  --surface-strong: rgba(255, 255, 255, 0.97);
  --surface-mute: rgba(245, 250, 255, 0.72);
  --text: #0e1c2e;
  --muted: #4b607f;
  --line: rgba(37, 64, 110, 0.18);
  --brand: #0e65c8;
  --brand-strong: #09478f;
  --code-bg: #edf3fb;
  --shadow: 0 20px 54px rgba(23, 44, 79, 0.11);
  --focus-ring: 3px solid rgba(14, 101, 200, 0.56);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #08111f;
    --bg-shape-a: rgba(88, 131, 255, 0.31);
    --bg-shape-b: rgba(32, 182, 161, 0.22);
    --surface: rgba(16, 27, 44, 0.72);
    --surface-strong: rgba(18, 31, 52, 0.9);
    --surface-mute: rgba(11, 22, 38, 0.85);
    --text: #e7efff;
    --muted: #9cb2d7;
    --line: rgba(168, 194, 238, 0.25);
    --brand: #8dc6ff;
    --brand-strong: #d4e8ff;
    --code-bg: rgba(8, 18, 35, 0.9);
    --shadow: 0 28px 70px rgba(2, 10, 24, 0.48);
    --focus-ring: 3px solid rgba(141, 198, 255, 0.6);
  }
}

:root[data-theme="dark"] {
  --bg: #08111f;
  --bg-shape-a: rgba(88, 131, 255, 0.31);
  --bg-shape-b: rgba(32, 182, 161, 0.22);
  --surface: rgba(16, 27, 44, 0.72);
  --surface-strong: rgba(18, 31, 52, 0.9);
  --surface-mute: rgba(11, 22, 38, 0.85);
  --text: #e7efff;
  --muted: #9cb2d7;
  --line: rgba(168, 194, 238, 0.25);
  --brand: #8dc6ff;
  --brand-strong: #d4e8ff;
  --code-bg: rgba(8, 18, 35, 0.9);
  --shadow: 0 28px 70px rgba(2, 10, 24, 0.48);
  --focus-ring: 3px solid rgba(141, 198, 255, 0.6);
}

* {
  box-sizing: border-box;
}

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

html {
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  letter-spacing: 0.004em;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  padding: 0.95rem 0.8rem 2.1rem;
}

a {
  color: var(--brand);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.17em;
}

a:hover {
  color: var(--brand-strong);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 0.7rem;
  top: -999px;
  z-index: 20;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  background: var(--surface-strong);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  color: var(--text);
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.skip-link:focus {
  top: 0.7rem;
}

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

.bg-shape {
  position: fixed;
  border-radius: 999px;
  filter: blur(72px);
  pointer-events: none;
  z-index: -1;
}

.bg-shape-a {
  width: 280px;
  height: 280px;
  top: -100px;
  left: -95px;
  background: var(--bg-shape-a);
}

.bg-shape-b {
  width: 250px;
  height: 250px;
  right: -95px;
  bottom: 9vh;
  background: var(--bg-shape-b);
}

.site-header,
.page-shell,
.site-footer {
  width: min(100%, var(--maxw));
  margin-inline: auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.15rem;
  flex-wrap: wrap;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: clamp(2rem, 10vw, 3.15rem);
  line-height: 0.98;
  letter-spacing: 0.01em;
}

.tagline {
  margin: 0.28rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
  max-width: 62ch;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav,
.footer-nav {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.site-nav a,
.footer-nav a,
.theme-toggle,
.share-actions a,
.share-actions button,
.home-quick-links a,
.discover-form input,
.discover-form select,
.archive-jump a,
.topic-card h2 a {
  min-height: 44px;
}

.site-nav a,
.footer-nav a,
.home-quick-links a {
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.82rem;
  font-size: 0.87rem;
}

.site-nav a:hover,
.footer-nav a:hover,
.home-quick-links a:hover {
  border-color: var(--brand);
}

.theme-toggle {
  width: 2.8rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  display: inline-grid;
  place-items: center;
  box-shadow: var(--shadow);
  cursor: pointer;
}

.section-label,
.post-kicker {
  margin: 0;
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--brand);
}

.home-intro,
.page-intro,
.home-featured,
.discover-panel,
.archive-home,
.post-wrap,
.topic-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.home-intro,
.page-intro,
.home-featured,
.discover-panel,
.archive-home,
.post-wrap {
  padding: 1rem;
}

.home-intro h1,
.page-intro h1,
.post-header h1,
.featured-card h2 {
  margin: 0.3rem 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: 0.002em;
  line-height: 1.05;
}

.home-intro h1,
.page-intro h1 {
  font-size: clamp(1.9rem, 8vw, 3.05rem);
}

.home-intro p,
.page-intro p {
  margin: 0;
  color: var(--muted);
  max-width: 66ch;
}

.home-featured {
  margin-top: 1rem;
  background: linear-gradient(165deg, var(--surface-strong) 0%, var(--surface) 72%);
}

.featured-card h2 {
  font-size: clamp(1.55rem, 5vw, 2.4rem);
}

.featured-card h2 a {
  color: var(--text);
  text-decoration: none;
}

.featured-link {
  margin: 0.9rem 0 0;
  font-size: 0.95rem;
  font-weight: 700;
}

.card-date,
.post-date,
.post-readtime {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.card-subtitle,
.card-description,
.post-subtitle {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.4rem;
  margin-bottom: 0.7rem;
  flex-wrap: wrap;
}

.section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  letter-spacing: 0.01em;
  font-weight: 500;
}

.section-link {
  font-size: 0.88rem;
  color: var(--muted);
}

.discover-panel {
  margin-top: 1rem;
  background: var(--surface-strong);
}

.discover-form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.58rem;
}

.discover-form input,
.discover-form select {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface-mute);
  color: var(--text);
  border-radius: 12px;
  padding: 0.65rem 0.78rem;
  font: inherit;
}

.discover-results {
  margin-top: 0.86rem;
  display: grid;
  gap: 0.72rem;
}

.discover-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.78rem 0.86rem;
  background: var(--surface-mute);
}

.discover-card h3 {
  margin: 0.25rem 0 0;
  line-height: 1.2;
  font-size: 1.07rem;
}

.discover-card h3 a {
  color: var(--text);
  text-decoration: none;
}

.discover-card .card-description {
  margin-top: 0.42rem;
  font-size: 0.92rem;
}

.discover-empty {
  margin: 0.8rem 0 0;
  color: var(--muted);
}

.tag-list {
  margin: 0.7rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag-list li {
  border: 1px solid var(--line);
  background: var(--surface-strong);
  border-radius: var(--radius-pill);
  padding: 0;
  font-size: 0.78rem;
}

.tag-list a,
.tag-list span {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0.12rem 0.62rem;
  color: var(--muted);
  text-decoration: none;
}

.tag-list a:hover {
  color: var(--brand-strong);
}

.home-quick-links {
  margin-top: 1rem;
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.archive-jump {
  margin: 1rem 0 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.archive-jump a {
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  padding: 0.34rem 0.7rem;
  text-decoration: none;
  font-size: 0.82rem;
  color: var(--muted);
  background: var(--surface);
  display: inline-flex;
  align-items: center;
}

.archive-home {
  margin-top: 0;
}

.archive-groups {
  display: grid;
  gap: 0.72rem;
}

.archive-year {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface-mute);
  overflow: clip;
}

.archive-year summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.78rem 0.9rem;
  min-height: 44px;
}

.archive-year summary::-webkit-details-marker {
  display: none;
}

.archive-year-label {
  font-family: var(--font-display);
  font-size: 1.28rem;
  letter-spacing: 0.01em;
}

.archive-year-count {
  color: var(--muted);
  font-size: 0.85rem;
}

.archive-list {
  margin: 0;
  padding: 0.35rem 0.9rem 0.9rem;
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.archive-item {
  display: grid;
  grid-template-columns: 4.6rem minmax(0, 1fr);
  gap: 0.62rem;
  align-items: start;
  border-top: 1px solid var(--line);
  padding-top: 0.58rem;
}

.archive-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.archive-date {
  margin: 0;
  color: var(--muted);
  font-size: 0.77rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.archive-copy h3 {
  margin: 0;
  line-height: 1.2;
  font-size: 1.02rem;
}

.archive-copy h3 a {
  color: var(--text);
  text-decoration: none;
}

.archive-copy p {
  margin: 0.22rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.topics-grid {
  margin-top: 1rem;
  display: grid;
  gap: 0.72rem;
}

.topic-card {
  padding: 0.9rem;
  background: var(--surface-strong);
}

.topic-card header {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  align-items: baseline;
  flex-wrap: wrap;
}

.topic-card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.45rem;
}

.topic-card h2 a {
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.topic-card header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.topic-list {
  margin: 0.58rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.45rem;
}

.topic-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  border-top: 1px solid var(--line);
  padding-top: 0.45rem;
}

.topic-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.topic-list a {
  color: var(--text);
  text-decoration: none;
  line-height: 1.35;
}

.topic-list span {
  color: var(--muted);
  font-size: 0.82rem;
}

.post-wrap {
  border-radius: var(--radius-shell);
  background: var(--surface-strong);
}

.post-meta {
  display: flex;
  gap: 0.45rem 0.8rem;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 0.15rem;
}

.summary-block {
  margin-top: 0.86rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-mute);
  padding: 0.7rem 0.85rem;
}

.summary-block h2 {
  margin: 0;
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--brand);
}

.summary-block p {
  margin: 0.4rem 0 0;
  color: var(--text);
}

.post-toc {
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-mute);
  padding: 0.75rem 0.86rem;
}

.post-toc h2 {
  margin: 0;
  font-size: 0.94rem;
  letter-spacing: 0.02em;
}

.post-toc ol {
  margin: 0.6rem 0 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.32rem;
}

.toc-item-sub {
  margin-left: 0.7rem;
  font-size: 0.95em;
}

.post-content {
  margin-top: 1rem;
  font-size: clamp(1.03rem, 1.1vw, 1.16rem);
  line-height: 1.78;
  max-width: 74ch;
  letter-spacing: 0.003em;
}

.post-content > * + * {
  margin-top: 1rem;
}

.post-content h2,
.post-content h3,
.post-content h4 {
  margin-top: 1.6rem;
  margin-bottom: 0.45rem;
  line-height: 1.22;
  letter-spacing: 0.002em;
}

.post-content h2 {
  font-size: clamp(1.35rem, 2.8vw, 1.9rem);
}

.post-content h3 {
  font-size: clamp(1.18rem, 2.2vw, 1.45rem);
}

.post-content img {
  width: 100%;
  height: auto;
  border-radius: 14px;
  box-shadow: 0 14px 32px rgba(13, 28, 52, 0.22);
}

.post-content pre {
  overflow-x: auto;
  padding: 0.9rem;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--code-bg);
}

.post-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.91em;
}

.post-content :not(pre) > code {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.08rem 0.35rem;
}

.post-content blockquote {
  margin: 1.15rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--brand);
  color: var(--muted);
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.post-content th,
.post-content td {
  border: 1px solid var(--line);
  padding: 0.45rem;
}

.share-tools {
  margin-top: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-mute);
  padding: 0.8rem 0.9rem;
}

.share-tools h2 {
  margin: 0;
  font-size: 0.95rem;
}

.share-actions {
  margin-top: 0.6rem;
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.share-actions a,
.share-actions button {
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--surface-strong);
  color: var(--text);
  text-decoration: none;
  font: inherit;
  font-size: 0.86rem;
  display: inline-flex;
  align-items: center;
  padding: 0.34rem 0.72rem;
  cursor: pointer;
}

.share-actions a:hover,
.share-actions button:hover {
  border-color: var(--brand);
}

.share-status {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  min-height: 1.1rem;
}

.post-nav {
  margin-top: 1.6rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.site-footer {
  margin-top: 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
  display: grid;
  gap: 0.56rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 420px) {
  .archive-item {
    grid-template-columns: 3.9rem minmax(0, 1fr);
  }

  .site-nav,
  .footer-nav {
    width: 100%;
  }
}

@media (min-width: 700px) {
  .discover-form {
    grid-template-columns: minmax(0, 1fr) 190px 160px;
  }

  .discover-results {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topics-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  body {
    padding: 1.35rem 1.12rem 2.9rem;
  }

  .home-intro,
  .page-intro,
  .home-featured,
  .discover-panel,
  .archive-home,
  .post-wrap {
    padding: 1.25rem;
  }

  .archive-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }
}

@media (min-width: 1120px) {
  body {
    padding: 1.9rem 1.3rem 4rem;
  }

  .site-header {
    margin-bottom: 1.5rem;
  }

  .home-intro,
  .page-intro,
  .home-featured,
  .discover-panel,
  .archive-home,
  .post-wrap {
    padding: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}