:root {
  --blog-reading: 56rem;
  --blog-gutter: max(1.5rem, var(--gutter, 1.5rem));
  --blog-body-size: 1rem;
  --blog-body-leading: 1.85;
  --blog-list-title: clamp(2rem, 4vw, 3rem);
  --blog-article-title: clamp(1.8rem, 3.4vw, 2.6rem);
  --blog-h2: clamp(1.3rem, 2.4vw, 1.6rem);
  --blog-h3: 1.3rem;
  --blog-small: 0.875rem;
  --blog-micro: 0.75rem;
  --blog-stat-size: clamp(1.6rem, 3vw, 2.4rem);
  --blog-title-weight: 400;
  --blog-label-weight: 600;
  --blog-tracking: 0.08em;
  --blog-radius: var(--radius, 6px);
  --blog-pill: var(--radius-round, 999px);
  --blog-square: var(--radius-button, 0px);
  --blog-tint: color-mix(in srgb, var(--accent) 9%, var(--bg-panel));
  --blog-tint-strong: color-mix(in srgb, var(--accent) 16%, var(--bg));
  --blog-paper-tint: color-mix(in srgb, var(--bg-panel-2) 65%, var(--bg-panel));
  --blog-warning-tint: color-mix(in srgb, var(--warn) 10%, var(--bg-panel));
  --blog-success-tint: color-mix(in srgb, var(--success) 10%, var(--bg-panel));
  --blog-shadow: 0 16px 48px color-mix(in srgb, var(--accent) 12%, transparent);
  --blog-highlight: inset 0 1px 0 var(--bg-panel);
  --blog-duration: var(--duration-fast, 160ms);
  --blog-ease: var(--ease-out, ease-out);
  --blog-focus: 3px solid var(--accent);
}

.blog-index,
.blog-article {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

.blog-index *,
.blog-article *,
.reading-wrap *,
.article-hero * {
  box-sizing: border-box;
}

.blog-index h1,
.blog-index h2,
.blog-index h3,
.article-hero h1,
.reading-wrap h1,
.reading-wrap h2,
.reading-wrap h3,
#related-posts h2,
#related-posts h3 {
  display: block;
  text-wrap: pretty;
  letter-spacing: normal;
  overflow-wrap: anywhere;
  font-family: var(--font-display);
}

.blog-index :focus-visible,
.blog-article :focus-visible,
.reading-wrap :focus-visible,
#post-nav :focus-visible,
#related-posts :focus-visible {
  outline: var(--blog-focus);
  outline-offset: 4px;
}

.blog-skip {
  position: absolute;
  inset-block-start: 0.5rem;
  inset-inline-start: var(--blog-gutter);
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--text);
  color: var(--on-dark);
  transform: translateY(-200%);
}

.blog-skip:focus {
  transform: none;
}

.blog-list-hero {
  position: relative;
  isolation: isolate;
  padding-block: 4rem 2.5rem;
}

.blog-list-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset-block: 2rem 1rem;
  inset-inline-start: var(--blog-gutter);
  width: min(64%, 36rem);
  background: var(--blog-tint-strong);
  border-radius: var(--blog-radius);
}

.blog-kicker,
.post-nav-label {
  font-family: var(--font-mono);
  font-size: var(--blog-micro);
  font-weight: var(--blog-label-weight);
  letter-spacing: var(--blog-tracking);
  text-transform: uppercase;
}

.blog-kicker {
  margin: 0 0 1rem;
  color: var(--accent-dark);
}

.blog-list-hero h1 {
  margin: 0;
  max-width: 24ch;
  font-size: var(--blog-list-title);
  font-weight: var(--blog-title-weight);
  line-height: 1.25;
}

.blog-lede {
  max-width: 44rem;
  margin: 1.5rem 0 0 1rem;
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
  color: var(--text-muted);
}

.blog-directory {
  padding-block: 1rem 4rem;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.blog-filters button {
  min-height: 44px;
  padding: 0.625rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-radius);
  background: var(--bg-panel);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--blog-small);
  cursor: pointer;
  transition: border-color var(--blog-duration) var(--blog-ease),
    background var(--blog-duration) var(--blog-ease);
}

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

.blog-filters button[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-dark);
}

.blog-result-status {
  margin: 1.25rem 0;
  color: var(--text-muted);
  font-size: var(--blog-small);
}

.blog-index .article-list {
  display: grid;
  gap: 0.75rem;
}

.blog-index .article-card {
  display: grid;
  grid-template-columns: 10rem minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: start;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-radius);
  background: var(--row, var(--bg-panel));
  box-shadow: var(--blog-highlight);
  transition: border-color var(--blog-duration) var(--blog-ease);
}

.blog-index .article-card:hover {
  border-color: var(--accent);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: var(--blog-small);
  line-height: 1.6;
}

.article-meta time {
  font-family: var(--font-mono);
  font-size: var(--blog-micro);
}

.article-meta .tag,
.article-hero .tag {
  display: inline-block;
  max-width: 100%;
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--accent);
  border-radius: var(--blog-pill);
  color: var(--on-dark);
  background: var(--accent);
  font-size: var(--blog-micro);
  white-space: normal;
}

.article-card-copy {
  min-width: 0;
}

.blog-index .article-card h2 {
  margin: 0 0 0.625rem;
  font-size: var(--blog-h3);
  font-weight: var(--blog-label-weight);
  line-height: 1.55;
}

.article-card h2 a,
.related-card h3 a {
  color: var(--text);
  text-decoration: none;
}

.article-card h2 a:hover,
.related-card h3 a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

.article-card p,
.related-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
  overflow-wrap: anywhere;
}

.article-arrow {
  padding-block: 0.25rem;
  color: var(--accent-dark);
  font-size: var(--blog-small);
  text-underline-offset: 0.25em;
}

.blog-empty {
  margin: 0;
  padding: 1.5rem;
  border: 1px dashed var(--border);
  border-radius: var(--blog-radius);
  color: var(--text-muted);
  line-height: var(--blog-body-leading);
}

/* 所有文章主区块共用同一盒宽和内衬。 */
.breadcrumbs,
.breadcrumb,
.article-hero,
.reading-wrap,
.blog-article > main > .promo-block,
.blog-article > main > #post-nav,
.blog-article > main > #related-posts {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(var(--blog-reading) + var(--blog-gutter) + var(--blog-gutter));
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
}

.breadcrumbs,
.breadcrumb {
  margin-top: 1.5rem;
  margin-bottom: 1rem;
  padding-top: 0.25rem;
  color: var(--text-muted);
  font-size: var(--blog-small);
  line-height: 1.8;
  overflow-wrap: anywhere;
}

.breadcrumbs ol,
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs a,
.breadcrumb a {
  color: var(--text-muted);
  text-underline-offset: 0.25em;
}

.breadcrumbs a:hover,
.breadcrumb a:hover {
  color: var(--accent-dark);
}

.article-hero {
  position: relative;
  isolation: isolate;
  padding-block: 2rem;
  background: none;
  border: 0;
  border-radius: var(--blog-radius);
}

.article-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset-block: 0.5rem 1rem;
  inset-inline-start: var(--blog-gutter);
  inset-inline-end: calc(var(--blog-gutter) + 12%);
  border-radius: var(--blog-radius);
  background: var(--blog-tint-strong);
}

.article-hero::after {
  content: "TC /";
  position: absolute;
  z-index: -1;
  inset-block-start: 1rem;
  inset-inline-end: var(--blog-gutter);
  color: var(--blog-tint-strong);
  font-family: var(--font-mono);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: var(--blog-label-weight);
  line-height: 1;
  pointer-events: none;
}

.article-hero h1 {
  position: relative;
  margin: 1rem 0;
  font-size: var(--blog-article-title);
  font-weight: var(--blog-title-weight);
  line-height: 1.45;
}

.article-hero .article-meta,
.article-hero .hero-meta {
  display: flex;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-inline-start: 1rem;
  font-size: var(--blog-small);
  line-height: 1.6;
}

.article-hero .article-meta time,
.article-hero .hero-meta time,
.article-hero .read-time,
.article-hero .reading-time {
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-pill);
  background: var(--bg-panel);
  color: var(--text-muted);
  font-size: var(--blog-micro);
}

.article-hero .lede,
.article-hero .article-summary,
.article-hero > p:not(.blog-kicker) {
  margin: 1rem 0 0 1rem;
  max-width: 48rem;
  color: var(--text-muted);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
}

.reading-wrap {
  padding-block: 0.5rem 2rem;
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
}

.reading-wrap.prose,
.reading-wrap .prose {
  color: var(--text);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
  counter-reset: tc-chapter;
  overflow-wrap: anywhere;
}

.reading-wrap .prose {
  max-width: none;
  width: 100%;
}

.prose h2 {
  display: block;
  counter-increment: tc-chapter;
  margin: 2.5rem 0 1rem;
  font-size: var(--blog-h2);
  font-weight: var(--blog-label-weight);
  line-height: 1.55;
  text-wrap: pretty;
  letter-spacing: normal;
}

.prose h2::before {
  content: counter(tc-chapter, decimal-leading-zero);
  display: inline-block;
  margin-inline-end: 0.75rem;
  padding: 0.125rem 0.375rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-radius);
  background: var(--blog-tint);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: var(--blog-small);
  vertical-align: 0.15em;
}

.prose > h2:first-child,
.prose > section:first-child > h2:first-child {
  margin-top: 0.75rem;
}

.prose h3 {
  display: block;
  margin: 1.75rem 0 0.75rem;
  font-size: var(--blog-h3);
  font-weight: var(--blog-label-weight);
  line-height: 1.6;
  text-wrap: pretty;
  letter-spacing: normal;
}

.prose p,
.prose ul,
.prose ol {
  margin-block: 0 1.25rem;
}

.prose li + li {
  margin-top: 0.375rem;
}

.prose a {
  color: var(--accent-dark);
  text-underline-offset: 0.2em;
  overflow-wrap: anywhere;
}

.prose code {
  font-family: var(--font-mono);
  font-size: var(--blog-small);
  background: var(--bg-panel-2);
  border-radius: var(--blog-radius);
  padding: 0.125rem 0.375rem;
  overflow-wrap: anywhere;
}

.prose pre {
  position: relative;
  margin-block: 1.5rem;
  max-width: 100%;
  padding: 3rem 1.5rem 1.5rem;
  overflow-x: auto;
  border: 1px solid var(--text);
  border-radius: var(--blog-radius);
  background: var(--text);
  color: var(--on-dark);
  box-shadow: var(--blog-shadow);
  line-height: 1.7;
}

.prose pre::before {
  content: "TC / TERMINAL";
  position: absolute;
  inset-block-start: 0.75rem;
  inset-inline-start: 1.5rem;
  color: var(--on-dark);
  font-family: var(--font-mono);
  font-size: var(--blog-micro);
  letter-spacing: var(--blog-tracking);
}

.prose pre code {
  display: block;
  width: max-content;
  min-width: 100%;
  padding: 0;
  background: none;
  color: inherit;
  white-space: pre;
  overflow-wrap: normal;
}

.prose .table-scroll {
  max-width: 100%;
  margin-block: 1.5rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--blog-radius);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--blog-small);
  line-height: 1.7;
}

.prose .table-scroll table {
  min-width: 38rem;
  margin: 0;
}

.prose caption {
  padding: 0.75rem 1rem;
  background: var(--bg-panel);
  color: var(--text-muted);
  text-align: start;
  font-weight: var(--blog-label-weight);
}

.prose th,
.prose td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border);
  text-align: start;
  vertical-align: top;
}

.prose thead th {
  background: var(--text);
  color: var(--on-dark);
  font-weight: var(--blog-label-weight);
}

.prose tbody tr {
  background: var(--bg-panel);
}

.prose tbody tr:nth-child(even) {
  background: var(--blog-paper-tint);
}

.prose tbody tr:hover {
  background: var(--blog-tint);
}

.prose .callout,
.prose blockquote,
.prose .verdict {
  position: relative;
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--border);
  border-inline-start: 4px solid var(--accent);
  border-radius: var(--blog-radius);
  background: var(--blog-tint);
  color: var(--text);
}

.prose .callout,
.prose blockquote {
  padding-inline-start: 3.5rem;
}

.prose .callout::before,
.prose blockquote::before {
  content: "i";
  position: absolute;
  inset-block-start: 1.35rem;
  inset-inline-start: 1rem;
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid var(--accent);
  border-radius: var(--blog-pill);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: var(--blog-small);
  line-height: 1.4rem;
  text-align: center;
}

.prose .callout.warning,
.prose .callout-warning {
  background: var(--blog-warning-tint);
  border-inline-start-color: var(--warn);
}

.prose .callout.warning::before,
.prose .callout-warning::before {
  content: "!";
  border-color: var(--warn);
  color: var(--text);
}

.prose .callout.success,
.prose .callout-success {
  background: var(--blog-success-tint);
  border-inline-start-color: var(--success);
}

.prose .callout.success::before,
.prose .callout-success::before {
  border-color: var(--success);
  color: var(--text);
}

.prose .callout > :last-child,
.prose blockquote > :last-child,
.prose .verdict > :last-child {
  margin-bottom: 0;
}

.prose .verdict strong:first-child {
  color: var(--accent-dark);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-block: 1.5rem;
}

.stat-card {
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--blog-radius);
  background: var(--blog-tint);
}

.stat-card:nth-child(even) {
  border-top-color: var(--text-muted);
  background: var(--blog-paper-tint);
}

.stat-num {
  display: block;
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--blog-stat-size);
  font-weight: var(--blog-title-weight);
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.stat-label {
  display: block;
  margin-top: 0.5rem;
  color: var(--text-muted);
  font-size: var(--blog-small);
}

.prose .check-list {
  margin-block: 1.5rem;
  padding: 0;
  list-style: none;
}

.prose .check-list li {
  margin: 0 0 0.625rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--blog-radius);
  background: var(--bg-panel);
  list-style: none;
}

.prose .check-list li::before {
  content: none;
}

.promo-block {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-block: 2rem;
  padding: 2rem 1.5rem;
  border: 1px solid var(--accent-dark);
  border-radius: var(--blog-radius);
  background: linear-gradient(120deg, var(--accent-dark), var(--accent));
  color: var(--on-dark);
  box-shadow: var(--blog-shadow);
  overflow: hidden;
}

.promo-block::before {
  content: "# % + =";
  position: absolute;
  z-index: -1;
  inset-inline-end: 1rem;
  inset-block-end: 0.25rem;
  color: color-mix(in srgb, var(--on-dark) 16%, transparent);
  font-family: var(--font-mono);
  font-size: clamp(2rem, 7vw, 4rem);
  letter-spacing: var(--blog-tracking);
  pointer-events: none;
}

.promo-block .promo-copy {
  min-width: 0;
  flex: 1 1 20rem;
}

.promo-block p {
  margin: 0;
  color: var(--on-dark);
  font-size: var(--blog-body-size);
  line-height: var(--blog-body-leading);
}

.promo-block .promo-brand {
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-weight: var(--blog-label-weight);
  letter-spacing: var(--blog-tracking);
}

.promo-block .btn,
.promo-block .btn-primary,
.promo-block .btn-main {
  background: var(--bg-panel);
  border: 1px solid var(--bg-panel);
  border-radius: var(--blog-square);
  color: var(--accent-dark);
  text-decoration: none;
}

.promo-block .btn-secondary,
.promo-block .btn-link {
  background: none;
  border-color: var(--on-dark);
  color: var(--on-dark);
}

.promo-block a:hover {
  box-shadow: inset 0 0 0 2px var(--accent-dark);
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-block: 0;
  padding-block: 1.5rem;
}

.post-nav-card {
  display: block;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--blog-radius);
  background: var(--bg-panel);
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--blog-duration) var(--blog-ease),
    transform var(--blog-duration) var(--blog-ease);
}

.post-nav-next {
  grid-column: 2;
}

.post-nav-label {
  display: block;
  color: var(--accent-dark);
}

.post-nav-title {
  display: block;
  margin-block: 0.75rem;
  font-size: var(--blog-body-size);
  font-weight: var(--blog-label-weight);
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.post-nav-date {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-micro);
}

#related-posts {
  margin-block: 0;
  padding-block: 1.5rem 2rem;
}

#related-posts:empty,
#post-nav:empty {
  display: none;
}

#related-posts .related-heading {
  margin: 0 0 1rem;
  font-size: var(--blog-h2);
  font-weight: var(--blog-label-weight);
}

#related-posts .related-heading::before {
  content: "";
  display: inline-block;
  width: 1.25rem;
  height: 0.2rem;
  margin-inline-end: 0.75rem;
  background: var(--accent);
  vertical-align: middle;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.related-card {
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--blog-radius);
  background: var(--bg-panel);
  transition: border-color var(--blog-duration) var(--blog-ease),
    transform var(--blog-duration) var(--blog-ease);
}

.related-card h3 {
  margin: 1rem 0 0.75rem;
  font-size: var(--blog-body-size);
  font-weight: var(--blog-label-weight);
  line-height: 1.7;
}

.related-card p {
  font-size: var(--blog-small);
}

.post-nav-card:hover,
.related-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.float-cta {
  position: fixed;
  z-index: 40;
  inset-inline-end: max(1.5rem, env(safe-area-inset-right));
  inset-block-end: max(1.5rem, env(safe-area-inset-bottom));
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  max-width: calc(100vw - 3rem);
  min-height: 48px;
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--text);
  border-radius: var(--blog-pill);
  background: var(--text);
  color: var(--on-dark);
  box-shadow: var(--blog-shadow);
  font-family: var(--font-body);
  font-size: var(--blog-small);
  line-height: 1.5;
  text-decoration: none;
}

.float-cta svg {
  width: 1.25rem;
  height: 1.25rem;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
}

.float-cta:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

@media (max-width: 860px) {
  .blog-index .article-card {
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
  }

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

  .prose table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
  }

  .prose .table-scroll table {
    display: table;
    width: 100%;
    max-width: none;
  }
}

@media (max-width: 640px) {
  .no-break {
    white-space: normal;
  }

  .blog-list-hero {
    padding-block: 2.5rem 1.5rem;
  }

  .blog-list-hero::before {
    inset-block-start: 1rem;
    width: 75%;
  }

  .blog-lede,
  .article-hero .article-meta,
  .article-hero .hero-meta,
  .article-hero .lede,
  .article-hero .article-summary,
  .article-hero > p:not(.blog-kicker) {
    margin-inline-start: 0;
  }

  .article-hero {
    padding-block: 1.5rem;
  }

  .article-hero::before {
    inset-inline-end: var(--blog-gutter);
  }

  .article-hero::after {
    font-size: 3rem;
  }

  .stat-grid,
  #post-nav {
    grid-template-columns: minmax(0, 1fr);
  }

  .post-nav-next {
    grid-column: auto;
  }

  .prose pre {
    padding-inline: 1rem;
  }

  .prose pre::before {
    inset-inline-start: 1rem;
  }

  .float-cta {
    inset-inline-end: 1rem;
    inset-block-end: max(0.75rem, env(safe-area-inset-bottom));
    max-width: calc(100vw - 2rem);
    padding: 0.625rem 1rem;
  }

  body:has(.float-cta) {
    padding-bottom: calc(5rem + env(safe-area-inset-bottom));
  }
}

@media (prefers-reduced-motion: reduce) {
  .blog-filters button,
  .blog-index .article-card,
  .post-nav-card,
  .related-card,
  .float-cta {
    transition: none;
  }

  .post-nav-card:hover,
  .related-card:hover {
    transform: none;
  }
}