:root {
  --blog-reading: 56rem;
  --blog-gutter: max(1.5rem, var(--gutter));
  --blog-column: calc(var(--blog-reading) + var(--blog-gutter) + var(--blog-gutter));
  --blog-copy-size: 1rem;
  --blog-h1-size: clamp(1.8rem, 4vw, 2.6rem);
  --blog-index-title: clamp(2rem, 5vw, 3rem);
  --blog-h2-size: clamp(1.25rem, 2.5vw, 1.6rem);
  --blog-h3-size: clamp(1.1rem, 2vw, 1.3rem);
  --blog-meta-size: 0.8125rem;
  --blog-small-size: 0.875rem;
  --blog-title-weight: 900;
  --blog-strong-weight: 700;
  --blog-tracking: -0.015em;
  --blog-line-height: 1.9;
  --blog-transition: 180ms;
  --blog-clear: transparent;
  --blog-band: color-mix(in srgb, var(--accent) 6%, var(--bg));
  --blog-success-tint: color-mix(in srgb, var(--success) 9%, var(--bg-panel));
  --blog-warning-tint: color-mix(in srgb, var(--warn) 10%, var(--bg-panel));
  --blog-promo-end: color-mix(in srgb, var(--accent-dark) 25%, var(--cocoa));
  --blog-rule: color-mix(in srgb, var(--accent) 30%, var(--border));
}

/* 所有阅读组件使用相同的盒宽、居中方式和内衬。 */
.reading-wrap,
.article-hero,
.breadcrumbs,
.article-breadcrumb,
.promo-block,
#related-posts,
#post-nav {
  box-sizing: border-box;
  width: 100%;
  max-width: var(--blog-column);
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
  min-width: 0;
}

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

.blog-list-page h1,
.blog-list-page h2,
.blog-list-page h3,
.article-hero h1,
.reading-wrap h1,
.reading-wrap h2,
.reading-wrap h3,
#related-posts h2,
#related-posts h3,
.promo-block h2 {
  display: block;
  font-family: var(--font-display);
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
  overflow-wrap: break-word;
}

.blog-skip {
  position: fixed;
  inset-block-start: 0.75rem;
  inset-inline-start: 1rem;
  z-index: 100;
  padding: 0.65rem 1rem;
  background: var(--bg-panel);
  color: var(--text);
  border: 1px solid var(--accent);
  border-radius: var(--radius-s);
  transform: translateY(-180%);
}

.blog-skip:focus {
  transform: translateY(0);
}

.blog-title-band {
  box-sizing: border-box;
  width: 100%;
  max-width: none;
  margin: 0;
  padding-block: clamp(2rem, 5vw, 3.5rem);
  padding-inline: 1.5rem;
  background-color: var(--blog-band);
  background-image:
    linear-gradient(var(--grid-line) 1px, var(--blog-clear) 1px),
    linear-gradient(90deg, var(--grid-line) 1px, var(--blog-clear) 1px);
  background-size: 2rem 2rem;
  border: 0;
  border-block: 1px solid var(--border);
  border-radius: 0;
  box-shadow: none;
}

/* 色带自己的安全内衬计入阅读列，避免双重 gutter。 */
.blog-title-band > .article-hero,
.blog-title-band > .reading-wrap {
  width: calc(100% + 3rem);
  max-width: var(--blog-column);
  margin-inline: auto;
  position: relative;
}

.blog-title-band:has(> .article-hero),
.blog-title-band:has(> .reading-wrap) {
  padding-inline: 0;
}

.blog-title-band > .article-hero,
.blog-title-band > .reading-wrap {
  width: 100%;
  padding-inline: var(--blog-gutter);
}

.article-hero h1 {
  margin: 0.8rem 0 1rem;
  font-size: var(--blog-h1-size);
  font-weight: var(--blog-title-weight);
  line-height: 1.35;
}

.blog-index-hero h1 {
  margin: 0.75rem 0;
  font-size: var(--blog-index-title);
  font-weight: var(--blog-title-weight);
  line-height: 1.3;
}

.blog-kicker {
  margin: 0 0 0.6rem;
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  line-height: 1.8;
}

.blog-deck,
.article-hero > p:last-child {
  max-width: 100%;
  margin-block: 0.75rem 0;
  font-size: var(--blog-copy-size);
  line-height: var(--blog-line-height);
  color: var(--text-muted);
}

.article-meta,
.article-hero .article-meta,
.article-hero .post-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: baseline;
  gap: 0.35rem 0.65rem;
  margin-block: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  color: var(--text-muted);
  background: var(--blog-clear);
  font-size: var(--blog-meta-size);
  line-height: 1.8;
}

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

.article-hero .article-meta > *,
.article-hero .post-meta > * {
  padding: 0;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  background: var(--blog-clear);
  color: inherit;
}

.breadcrumbs,
.article-breadcrumb {
  margin-top: 1.5rem;
  margin-bottom: 1.25rem;
  padding-top: 0.25rem;
  font-size: var(--blog-small-size);
  line-height: 1.8;
  color: var(--text-muted);
  overflow-wrap: anywhere;
}

.breadcrumbs ol,
.article-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.6rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumbs a,
.article-breadcrumb a {
  color: var(--text-muted);
  text-underline-offset: 0.2em;
}

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

.blog-catalog {
  padding-block: 2rem 3rem;
}

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

.blog-filters[hidden] {
  display: none;
}

.blog-filter {
  min-height: 2.75rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  background: var(--bg-panel);
  color: var(--text-muted);
  font: inherit;
  font-size: var(--blog-small-size);
  cursor: pointer;
  transition: border-color var(--blog-transition), background-color var(--blog-transition);
}

.blog-filter:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

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

.blog-result-status {
  margin: 1rem 0;
  font-size: var(--blog-small-size);
  color: var(--text-muted);
}

.blog-post-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.article-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--blog-rule);
  border-radius: var(--radius-m);
  background: var(--bg-panel);
  box-shadow: inset 0 1px 0 var(--hi-line), var(--shadow-panel);
  transition: border-color var(--blog-transition), transform var(--blog-transition);
}

.article-card:hover,
.article-card:focus-within {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.article-card h2,
.article-card h3,
#related-posts .article-card h3 {
  margin: 0.9rem 0 0.75rem;
  font-size: var(--blog-h3-size);
  font-weight: var(--blog-strong-weight);
  line-height: 1.6;
}

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

.article-card h2 a:hover,
.article-card h3 a:hover {
  color: var(--accent-dark);
}

.article-card p {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: var(--blog-copy-size);
  line-height: 1.8;
}

.article-more {
  align-self: flex-start;
  margin-top: auto;
  color: var(--accent-dark);
  font-size: var(--blog-small-size);
  font-weight: var(--blog-strong-weight);
  text-decoration: none;
  text-underline-offset: 0.2em;
}

.article-more:hover {
  text-decoration: underline;
}

.blog-empty {
  grid-column: 1 / -1;
  padding: 1.5rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius-m);
  color: var(--text-muted);
  line-height: 1.8;
}

/* 正文不继承营销展示字号，也不对标题应用 flex 或 grid。 */
.reading-wrap.prose,
.reading-wrap .prose,
.article-body {
  font-family: var(--font-body);
  font-size: var(--blog-copy-size);
  line-height: var(--blog-line-height);
  color: var(--text);
  counter-reset: blog-section;
  overflow-wrap: break-word;
}

.reading-wrap.prose,
.reading-wrap.article-body {
  padding-block: 2rem;
}

.prose > :first-child,
.article-body > :first-child {
  margin-top: 0;
}

.prose h2,
.article-body h2 {
  display: block;
  margin: 2rem 0 0.9rem;
  font-size: var(--blog-h2-size);
  line-height: 1.55;
  font-weight: var(--blog-strong-weight);
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
  scroll-margin-top: var(--anchor-offset);
}

.prose h2::before,
.article-body h2::before {
  content: "";
  display: inline-block;
  width: 1.3rem;
  height: 0.2rem;
  margin-inline-end: 0.6rem;
  vertical-align: middle;
  border-radius: var(--radius-pill);
  background: var(--accent);
}

.prose h3,
.article-body h3 {
  display: block;
  margin: 1.5rem 0 0.7rem;
  font-size: var(--blog-h3-size);
  line-height: 1.6;
  letter-spacing: var(--blog-tracking);
  text-wrap: pretty;
}

.prose p,
.article-body p {
  margin-block: 0 1.1rem;
  font-size: var(--blog-copy-size);
  line-height: var(--blog-line-height);
}

.prose ul,
.prose ol,
.article-body ul,
.article-body ol {
  margin-block: 1rem 1.4rem;
  padding-inline-start: 1.5rem;
}

.prose li,
.article-body li {
  margin-block: 0.4rem;
}

.prose a:not(.btn),
.article-body a:not(.btn) {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  overflow-wrap: anywhere;
}

.prose img,
.article-body img,
.prose svg,
.article-body svg {
  max-width: 100%;
  height: auto;
}

.prose code,
.article-body code {
  padding: 0.1em 0.35em;
  border-radius: var(--radius-xs);
  background: var(--bg-panel-2);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  overflow-wrap: anywhere;
}

.prose pre,
.article-body pre {
  position: relative;
  max-width: 100%;
  margin-block: 1.5rem;
  padding: 2.8rem 1.25rem 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--on-dark-line);
  border-radius: var(--radius-m);
  background: var(--cocoa);
  color: var(--on-dark);
  line-height: 1.8;
  text-align: start;
}

.prose pre::before,
.article-body pre::before {
  content: "TERMINAL / 操作记录";
  position: absolute;
  inset-block-start: 0.7rem;
  inset-inline-start: 1.25rem;
  color: var(--on-dark-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-meta-size);
}

.prose pre code,
.article-body pre code {
  padding: 0;
  border: 0;
  background: var(--blog-clear);
  color: inherit;
  white-space: pre;
  overflow-wrap: normal;
}

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

.prose table,
.article-body table {
  width: 100%;
  margin-block: 1.5rem;
  border-collapse: collapse;
  font-size: var(--blog-small-size);
  line-height: 1.8;
}

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

.prose th,
.article-body th {
  padding: 0.9rem 1rem;
  background: var(--cocoa);
  color: var(--on-dark);
  font-weight: var(--blog-strong-weight);
  text-align: start;
}

.prose td,
.article-body td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

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

.prose tbody tr:nth-child(even),
.article-body tbody tr:nth-child(even) {
  background: var(--bg-panel-2);
}

.prose tbody tr:hover,
.article-body tbody tr:hover {
  background: var(--selected-bg);
}

.prose caption,
.article-body caption {
  padding: 0.65rem;
  color: var(--text-muted);
  text-align: start;
}

.callout,
.prose blockquote,
.article-body blockquote {
  position: relative;
  margin: 1.5rem 0;
  padding: 1.2rem 1.25rem 1.2rem 3rem;
  border: 1px solid var(--border);
  border-inline-start: 4px solid var(--accent);
  border-radius: var(--radius-s);
  background: var(--blog-band);
  color: var(--text);
}

.callout::before,
.prose blockquote::before,
.article-body blockquote::before {
  content: "i";
  position: absolute;
  inset-block-start: 1.3rem;
  inset-inline-start: 0.9rem;
  display: inline-block;
  width: 1.2rem;
  height: 1.2rem;
  border: 1px solid currentColor;
  border-radius: var(--radius-circle);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: var(--blog-small-size);
  line-height: 1.2rem;
  text-align: center;
}

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

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

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

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

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

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  gap: 1rem;
  margin-block: 1.5rem;
}

.stat-card {
  min-width: 0;
  padding: 1.3rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius-m);
  background: var(--blog-band);
  box-shadow: inset 0 1px 0 var(--hi-line);
}

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

.stat-num {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
  font-size: var(--blog-h2-size);
  font-weight: var(--blog-strong-weight);
  color: var(--text);
  overflow-wrap: anywhere;
}

.stat-label {
  display: block;
  color: var(--text-muted);
  font-size: var(--blog-small-size);
  line-height: 1.8;
}

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

.check-list li {
  list-style: none;
  margin-block: 0.65rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  background: var(--bg-panel);
}

.verdict {
  margin-block: 1.5rem;
  padding: 1.15rem 1.25rem;
  border-inline-start: 4px solid var(--accent);
  border-radius: var(--radius-s);
  background: var(--bg-panel-2);
  color: var(--text);
  line-height: var(--blog-line-height);
}

.verdict > :last-child {
  margin-bottom: 0;
}

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

.promo-block {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-block: 1rem 2rem;
  padding-block: 1.75rem;
  border-block: 1px solid var(--on-dark-line);
  background: linear-gradient(120deg, var(--cocoa), var(--blog-promo-end));
  color: var(--on-dark);
  box-shadow: var(--shadow-panel);
}

.promo-block::before {
  content: "";
  position: absolute;
  inset: 0.5rem;
  border: 1px dashed var(--on-dark-line);
  border-radius: var(--radius-s);
  pointer-events: none;
}

.promo-block h2 {
  margin: 0 0 0.5rem;
  color: var(--on-dark);
  font-size: var(--blog-h2-size);
  line-height: 1.5;
}

.promo-block > div:first-child {
  flex: 1 1 0;
  overflow-wrap: anywhere;
}

.promo-block > .stack {
  flex: 0 0 auto;
  max-width: 100%;
}

.promo-block p {
  margin: 0;
  color: var(--on-dark);
  font-size: var(--blog-copy-size);
  line-height: 1.8;
}

.promo-block .btn--solid,
.promo-block .btn-primary {
  flex-shrink: 0;
  background: var(--bg-panel);
  border-color: var(--bg-panel);
  color: var(--cocoa);
}

.promo-block .btn--solid:hover,
.promo-block .btn-primary:hover {
  background: var(--bg-panel-2);
  border-color: var(--bg-panel-2);
  color: var(--cocoa);
}

.promo-block .btn--line {
  background: var(--blog-clear);
  border-color: var(--on-dark-muted);
  color: var(--on-dark);
}

#related-posts {
  padding-block: 1rem 1.5rem;
}

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

#related-posts > h2 {
  margin: 0 0 1.2rem;
  color: var(--text);
  font-size: var(--blog-h2-size);
  line-height: 1.5;
}

#related-posts .article-card {
  padding: 1.2rem;
}

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

.post-nav-card {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--blog-rule);
  border-radius: var(--radius-m);
  background: var(--bg-panel);
  color: var(--text);
  text-decoration: none;
  line-height: 1.8;
  transition: border-color var(--blog-transition), transform var(--blog-transition);
}

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

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

.post-nav-label {
  color: var(--accent-dark);
  font-size: var(--blog-small-size);
}

.post-nav-card strong {
  font-weight: var(--blog-strong-weight);
  overflow-wrap: break-word;
}

.blog-modal-open {
  overflow: hidden;
}

.blog-signup-modal {
  box-sizing: border-box;
  width: min(30rem, calc(100% - 3rem));
  max-width: calc(100% - 3rem);
  max-height: calc(100dvh - 3rem);
  margin: auto;
  padding: 0;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  background: var(--bg-panel);
  color: var(--text);
  box-shadow: var(--shadow-panel);
  opacity: 0;
  transform: translateY(0.6rem);
  transition: opacity var(--blog-transition), transform var(--blog-transition);
}

.blog-signup-modal::backdrop {
  background: var(--veil-color);
  opacity: 0;
  transition: opacity var(--blog-transition);
}

.blog-signup-modal.is-open,
.blog-signup-modal.is-open::backdrop {
  opacity: 1;
}

.blog-signup-modal.is-open {
  transform: translateY(0);
}

.blog-signup-modal__panel {
  position: relative;
  padding: 3.5rem 1.75rem 1.75rem;
  box-shadow: inset 0 1px 0 var(--hi-line);
}

.blog-signup-modal__panel h2 {
  display: block;
  margin: 0.6rem 0 1rem;
  font-family: var(--font-display);
  font-size: var(--blog-h2-size);
  font-weight: var(--blog-title-weight);
  line-height: 1.5;
}

.blog-signup-modal__panel p {
  font-size: var(--blog-copy-size);
  line-height: 1.8;
}

.blog-signup-modal__panel .blog-kicker {
  font-size: var(--blog-small-size);
}

.blog-signup-modal__panel .btn {
  margin-top: 0.75rem;
}

.blog-signup-modal__close {
  position: absolute;
  inset-block-start: 0.65rem;
  inset-inline-end: 0.65rem;
  display: inline-block;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  background: var(--bg-panel);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: var(--blog-h2-size);
  line-height: 1;
  cursor: pointer;
}

.blog-signup-modal__close:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
  background: var(--blog-band);
}

.blog-filter:focus-visible,
.article-card a:focus-visible,
.breadcrumbs a:focus-visible,
.article-breadcrumb a:focus-visible,
.post-nav-card:focus-visible,
.blog-signup-modal a:focus-visible,
.blog-signup-modal button:focus-visible,
.blog-skip:focus-visible,
.prose a:focus-visible,
.table-scroll:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

@media (max-width: 1000px) {
  .blog-post-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 860px) {
  .prose table,
  .article-body table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
  }

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

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

  .blog-post-grid,
  #post-nav {
    grid-template-columns: 1fr;
  }

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

  .promo-block {
    flex-direction: column;
    align-items: flex-start;
  }

  .article-card {
    padding: 1.25rem;
  }

  .blog-title-band {
    padding-block: 2rem;
  }

  .reading-wrap.prose,
  .reading-wrap.article-body {
    padding-block: 1.5rem;
  }

  .article-hero h1 {
    line-height: 1.45;
  }

  .blog-signup-modal__panel {
    padding-inline: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-card,
  .post-nav-card,
  .blog-filter,
  .blog-signup-modal,
  .blog-signup-modal::backdrop {
    transition: none;
  }

  .article-card:hover,
  .article-card:focus-within,
  .post-nav-card:hover,
  .post-nav-card:focus-visible,
  .blog-signup-modal {
    transform: none;
  }
}