:root {
  --blog-reading: 56rem;
  --blog-gutter: var(--gutter, 1.5rem);
  --blog-font-body: 1rem;
  --blog-font-small: 0.8125rem;
  --blog-font-card: 1.25rem;
  --blog-font-h1: clamp(1.85rem, 4vw, 2.6rem);
  --blog-font-list-h1: clamp(2rem, 4.5vw, 3rem);
  --blog-font-h2: clamp(1.3rem, 2.5vw, 1.6rem);
  --blog-font-h3: 1.3rem;
  --blog-font-intro: 1.15rem;
  --blog-font-stat: 1.8rem;
  --blog-reading-leading: 1.9;
  --blog-title-leading: 1.35;
  --blog-tracking: -0.02em;
  --blog-rule: 4px;
  --blog-line: 1px;
  --blog-focus: 2px;
  --blog-radius: var(--r-md, 12px);
  --blog-control-radius: var(--r-control, 8px);
  --blog-pill: var(--r-pill, 999px);
  --blog-weight: var(--weight-bold, 700);
  --blog-heavy: var(--weight-display, 800);
  --blog-space: 1.5rem;
  --blog-section: 2.75rem;
  --blog-ease: var(--duration-fast, 180ms);
  --blog-tint-accent: color-mix(in srgb, var(--accent) 9%, var(--panel-2));
  --blog-tint-success: color-mix(in srgb, var(--success) 10%, var(--panel-2));
  --blog-tint-warn: color-mix(in srgb, var(--warn) 12%, var(--panel-2));
  --blog-row-hover: color-mix(in srgb, var(--accent) 12%, var(--panel-2));
  --blog-quote-bg: color-mix(in srgb, var(--panel) 55%, var(--panel-2));
  --blog-promo-end: color-mix(in srgb, var(--board) 86%, var(--accent));
  --blog-shadow: var(--card-shadow, 0 16px 40px var(--shadow-ochre));
}

.blog-index,
.blog-article,
.article-body {
  min-width: 0;
}

.reading-wrap,
.article-hero,
.article-masthead {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(var(--blog-reading) + var(--blog-gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
}

.article-hero .article-masthead,
.article-hero .reading-wrap,
.reading-wrap .article-masthead {
  max-width: none;
  width: 100%;
  margin-inline: 0;
  padding-inline: 0;
}

.blog-index h1,
.article-hero h1,
.article-masthead h1,
.prose h1,
.prose h2,
.prose h3,
.blog-post-card h3,
#related-posts h2,
#related-posts h3 {
  display: block;
  text-wrap: pretty;
  letter-spacing: var(--blog-tracking);
  overflow-wrap: break-word;
  font-family: var(--font-display);
  line-height: var(--blog-title-leading);
}

.blog-skip {
  position: fixed;
  z-index: 100;
  inset-block-start: 0.75rem;
  inset-inline-start: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--blog-control-radius);
  background: var(--text);
  color: var(--paper);
  transform: translateY(-180%);
}

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

.breadcrumbs {
  padding-top: 1.5rem;
  padding-bottom: 1.25rem;
  color: var(--text-muted);
  font-size: var(--blog-font-small);
  line-height: 1.8;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.65rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.breadcrumbs li {
  min-width: 0;
  overflow-wrap: anywhere;
}

.breadcrumbs li + li::before {
  content: "/";
  padding-inline-end: 0.65rem;
  color: var(--text-muted);
}

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

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

.blog-kicker {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0 0 1.15rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-font-small);
}

.blog-blaze {
  display: inline-block;
  flex: 0 0 auto;
  width: 1.4rem;
  height: 0.9rem;
  background: linear-gradient(
    to bottom,
    var(--panel-2) 0 40%,
    var(--border) 40% 55%,
    var(--accent) 55% 100%
  );
}

.blog-list-hero h1 {
  margin: 0 0 1.15rem;
  font-size: var(--blog-font-list-h1);
  font-weight: var(--blog-heavy);
}

.blog-intro {
  max-width: 43rem;
  margin: 0;
  color: var(--text-muted);
  font-family: var(--font-serif);
  font-size: var(--blog-font-intro);
  line-height: var(--blog-reading-leading);
}

.blog-catalog {
  padding-top: 0;
  padding-bottom: 4rem;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding-block: 1.25rem;
  border-block: var(--blog-line) solid var(--border);
}

.blog-filters button {
  min-height: 2.75rem;
  padding: 0.65rem 1rem;
  border: var(--blog-line) solid var(--border);
  border-radius: var(--blog-control-radius);
  color: var(--text);
  background: var(--panel-2);
  font-family: var(--font-body);
  font-size: var(--blog-font-small);
  font-weight: var(--blog-weight);
  cursor: pointer;
  transition: background var(--blog-ease), border-color var(--blog-ease);
}

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

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

.blog-filters button:active {
  transform: translateY(1px);
}

.blog-filters button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.blog-filter-status {
  min-height: 1.6em;
  margin-block: 1rem 1.5rem;
  font-family: var(--font-mono);
  font-size: var(--blog-font-small);
  color: var(--text-muted);
}

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

.blog-post-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.5rem;
  border: 0;
  border-radius: var(--blog-radius);
  background: var(--panel);
  box-shadow: inset 0 var(--blog-line) 0 var(--hl-top), var(--blog-shadow);
}

.blog-post-card h3 {
  margin: 0 0 1rem;
  font-size: var(--blog-font-card);
  font-weight: var(--blog-heavy);
}

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

.blog-post-card h3 a:hover {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 0.22em;
}

.blog-post-card .article-summary {
  margin: 0 0 1.5rem;
  padding: 0;
  border: 0;
  color: var(--text-muted);
  font-family: var(--font-serif);
  font-size: var(--blog-font-body);
  line-height: 1.85;
}

.blog-post-card .data-rows {
  margin: auto 0 1.25rem;
}

.blog-post-card .data-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  padding-block: 0.7rem;
  border-bottom: var(--blog-line) solid var(--border);
  font-family: var(--font-mono);
  font-size: var(--blog-font-small);
}

.blog-post-card dt {
  color: var(--text-muted);
}

.blog-post-card dd {
  margin: 0;
  text-align: right;
  color: var(--text);
}

.blog-read-link {
  flex: 0 0 auto;
  align-self: flex-start;
  white-space: normal;
  color: var(--paper);
  background: var(--text);
  border-radius: var(--blog-control-radius);
}

.blog-empty {
  grid-column: 1 / -1;
  padding: 1.5rem;
  margin: 0;
  background: var(--panel-2);
  color: var(--text-muted);
  border-radius: var(--blog-radius);
  line-height: 1.8;
}

/* 刊头线位于阅读列内侧，与正文共用同一水平基线。 */
.article-hero,
.article-masthead {
  position: relative;
  padding-top: 0;
  padding-bottom: 1.75rem;
  background: none;
  border: 0;
  border-radius: var(--r-zero);
  box-shadow: none;
}

.article-hero::before,
.article-masthead::before {
  content: "";
  display: block;
  height: var(--blog-rule);
  margin-bottom: 1.25rem;
  background: linear-gradient(to right, var(--accent) 0 22%, var(--text) 22% 100%);
}

.article-hero .article-masthead::before {
  content: none;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: center;
  gap: 0.5rem 1rem;
  margin: 0 0 1.15rem;
  font-family: var(--font-mono);
  font-size: var(--blog-font-small);
  line-height: 1.8;
  color: var(--text-muted);
}

.article-meta .tag,
.article-meta .article-category {
  border: 0;
  border-radius: var(--r-zero);
  padding: 0.2rem 0.5rem;
  background: var(--text);
  color: var(--paper);
}

.article-hero h1,
.article-masthead h1 {
  font-size: var(--blog-font-h1);
  font-weight: var(--blog-heavy);
  margin: 0 0 1.25rem;
}

.article-hero .article-summary,
.article-masthead > .article-summary {
  margin: 0;
  padding-block: 0 1.5rem;
  border-bottom: var(--blog-line) solid var(--border);
  font-family: var(--font-serif);
  font-size: var(--blog-font-intro);
  line-height: var(--blog-reading-leading);
  color: var(--text-muted);
}

.prose {
  min-width: 0;
  font-family: var(--font-body);
  font-size: var(--blog-font-body);
  line-height: var(--blog-reading-leading);
  color: var(--text);
  overflow-wrap: break-word;
  counter-reset: blog-section;
}

.reading-wrap.prose {
  width: 100%;
  max-width: calc(var(--blog-reading) + var(--blog-gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
}

.prose p {
  margin: 0 0 1.25rem;
}

.prose h2 {
  counter-increment: blog-section;
  margin: 2.5rem 0 1.1rem;
  padding-top: 0.75rem;
  border-top: var(--blog-line) solid var(--border);
  font-size: var(--blog-font-h2);
  font-weight: var(--blog-heavy);
  scroll-margin-top: var(--anchor-space);
}

.prose > h2:first-child,
.prose > section:first-child > h2:first-child {
  margin-top: 0.5rem;
}

.prose h2::before {
  content: counter(blog-section, decimal-leading-zero);
  display: inline-block;
  margin-inline-end: 0.7rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: var(--blog-font-small);
  vertical-align: middle;
}

.prose h3 {
  margin: 1.75rem 0 0.75rem;
  font-size: var(--blog-font-h3);
  font-weight: var(--blog-weight);
}

.prose ul,
.prose ol {
  margin: 0 0 1.5rem;
  padding-inline-start: 1.5rem;
}

.prose li + li {
  margin-top: 0.5rem;
}

.prose a {
  color: var(--accent-dark);
  text-underline-offset: 0.22em;
  text-decoration-thickness: var(--blog-line);
}

.prose a:hover {
  color: var(--text);
}

.prose strong {
  font-weight: var(--blog-weight);
}

.prose blockquote {
  margin: 1.75rem 0;
  padding: 1.25rem 1.5rem;
  border-inline-start: var(--blog-rule) solid var(--accent);
  border-radius: var(--blog-control-radius);
  background: var(--blog-quote-bg);
  font-family: var(--font-serif);
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose code {
  padding: 0.1em 0.35em;
  border-radius: var(--r-xs);
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

.prose pre {
  position: relative;
  max-width: 100%;
  overflow-x: auto;
  margin: 1.75rem 0;
  padding: 3rem 1.5rem 1.5rem;
  border: var(--blog-line) solid var(--paper-14);
  border-radius: var(--blog-radius);
  background: var(--board);
  color: var(--paper);
  line-height: 1.8;
  tab-size: 2;
}

.prose pre::before {
  content: "ROUTE / 线路笔记";
  position: absolute;
  top: 0.8rem;
  left: 1.5rem;
  color: var(--paper-80);
  font-family: var(--font-mono);
  font-size: var(--blog-font-small);
}

.prose pre code {
  padding: 0;
  border: 0;
  border-radius: var(--r-zero);
  background: none;
  color: inherit;
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
}

.prose .table-scroll {
  max-width: 100%;
  overflow-x: auto;
  margin-block: 1.75rem;
  border: var(--blog-line) solid var(--border);
  border-radius: var(--blog-control-radius);
}

.prose table {
  width: 100%;
  margin: 0;
  border-collapse: collapse;
  font-size: var(--blog-font-body);
  line-height: 1.8;
}

.prose caption {
  padding: 1rem;
  text-align: left;
  font-family: var(--font-serif);
  color: var(--text-muted);
}

.prose th,
.prose td {
  padding: 0.85rem 1rem;
  border-bottom: var(--blog-line) solid var(--border);
  text-align: left;
  vertical-align: top;
}

.prose thead th {
  color: var(--paper);
  background: var(--board);
  font-weight: var(--blog-weight);
}

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

.prose tbody tr:nth-child(odd) {
  background: var(--panel-2);
}

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

.callout,
.prose .callout {
  position: relative;
  margin: 1.75rem 0;
  padding: 1.25rem 1.25rem 1.25rem 3.5rem;
  border: 0;
  border-inline-start: var(--blog-rule) solid var(--accent);
  border-radius: var(--blog-control-radius);
  color: var(--text);
  background: var(--blog-tint-accent);
}

.callout::before {
  content: "i";
  position: absolute;
  top: 1.35rem;
  left: 1rem;
  display: inline-block;
  width: 1.4rem;
  height: 1.4rem;
  border: var(--blog-line) solid currentColor;
  border-radius: var(--blog-pill);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: var(--blog-font-small);
  font-weight: var(--blog-weight);
  line-height: 1.4rem;
  text-align: center;
}

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

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

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

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

.callout p:last-child {
  margin-bottom: 0;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr));
  gap: 1rem;
  margin-block: 1.75rem;
}

.stat-card {
  min-width: 0;
  padding: 1.25rem;
  border-top: var(--blog-rule) solid var(--accent);
  border-radius: var(--blog-control-radius);
  background: var(--blog-tint-accent);
  color: var(--text);
}

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

.stat-num {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-display);
  font-size: var(--blog-font-stat);
  font-weight: var(--blog-heavy);
  line-height: 1.35;
  overflow-wrap: anywhere;
}

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

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

.check-list li {
  padding: 1rem 1.25rem;
  border: var(--blog-line) solid var(--border);
  border-radius: var(--blog-control-radius);
  background: var(--panel-2);
  list-style: none;
}

.check-list li + li {
  margin-top: 0.65rem;
}

.verdict {
  margin: 1.75rem 0;
  padding: 1.25rem 1.5rem;
  border-inline-start: var(--blog-rule) solid var(--accent);
  border-radius: var(--blog-control-radius);
  background: var(--panel);
  color: var(--text);
}

.verdict > strong:first-child {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: var(--blog-heavy);
}

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

.promo-block {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-block: 2.5rem;
  padding: 1.75rem;
  border: var(--blog-line) solid var(--paper-28);
  border-radius: var(--blog-radius);
  background: linear-gradient(120deg, var(--board), var(--blog-promo-end));
  box-shadow: inset 0 var(--blog-line) 0 var(--paper-14);
  color: var(--paper);
}

.promo-block::before {
  content: "";
  display: block;
  flex: 0 0 100%;
  height: var(--blog-rule);
  background: linear-gradient(to right, var(--paper) 0 12%, var(--accent) 12% 24%, var(--paper-14) 24% 100%);
}

.promo-name {
  font-family: var(--font-display);
  font-size: var(--blog-font-h2);
  font-weight: var(--blog-heavy);
}

.promo-block p {
  margin: 0.5rem 0 0;
  font-family: var(--font-serif);
  line-height: 1.85;
  color: var(--paper-94);
}

.promo-block .btn,
.prose .promo-block .btn {
  flex-shrink: 0;
  padding: 0.8rem 1.25rem;
  border: var(--blog-line) solid var(--paper);
  border-radius: var(--blog-control-radius);
  background: var(--paper);
  color: var(--text);
  text-decoration: none;
  font-weight: var(--blog-weight);
}

.promo-block .btn-secondary,
.promo-block .btn-line {
  background: none;
  border-color: var(--paper-60);
  color: var(--paper);
}

.promo-block .btn:hover {
  background: var(--panel);
  color: var(--text);
}

#related-posts,
#post-nav {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(var(--blog-reading) + var(--blog-gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
}

.reading-wrap #related-posts,
.reading-wrap #post-nav {
  max-width: none;
  padding-inline: 0;
}

#related-posts {
  padding-block: 1.5rem 1.75rem;
}

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

#related-posts > h2 {
  margin: 0 0 1.25rem;
  font-size: var(--blog-font-h2);
  font-weight: var(--blog-heavy);
}

.related-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.25rem;
  border: var(--blog-line) solid var(--border);
  border-top: var(--blog-rule) solid var(--border);
  border-radius: var(--blog-control-radius);
  background: var(--panel);
  color: var(--text);
  transition: transform var(--blog-ease), border-color var(--blog-ease);
}

.related-card h3 {
  margin: 0.85rem 0;
  font-size: var(--blog-font-card);
}

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

.related-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 0.35rem 0.8rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--blog-font-small);
  color: var(--text-muted);
  line-height: 1.8;
}

.related-summary {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-family: var(--font-serif);
  font-size: var(--blog-font-body);
  line-height: 1.85;
}

.related-read {
  align-self: flex-start;
  margin-top: auto;
  color: var(--text);
  font-weight: var(--blog-weight);
  text-underline-offset: 0.2em;
}

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

.post-nav-card {
  display: block;
  min-width: 0;
  padding: 1.25rem;
  border: var(--blog-line) solid var(--border);
  border-top: var(--blog-rule) solid var(--border);
  border-radius: var(--blog-control-radius);
  background: var(--panel-2);
  color: var(--text);
  text-decoration: none;
  transition: transform var(--blog-ease), border-color var(--blog-ease);
}

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

.post-nav-label {
  display: block;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--blog-font-small);
}

.post-nav-title {
  display: block;
  margin-bottom: 0.75rem;
  font-size: var(--blog-font-body);
  font-weight: var(--blog-weight);
  line-height: 1.8;
  overflow-wrap: anywhere;
}

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

.blog-index :is(a, button):focus-visible,
.breadcrumbs a:focus-visible,
.article-hero a:focus-visible,
.prose :is(a, pre, .table-scroll):focus-visible,
.promo-block a:focus-visible,
#related-posts a:focus-visible,
#post-nav a:focus-visible {
  outline: var(--blog-focus) solid var(--accent);
  outline-offset: 4px;
}

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

.prose hr {
  margin-block: 2rem;
  border: 0;
  border-top: var(--blog-line) solid var(--border);
}

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

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

  .prose .table-scroll table {
    display: table;
    width: 100%;
    min-width: 36rem;
    max-width: none;
  }

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

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

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

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

  .blog-post-card {
    padding: 1.25rem;
  }

  .blog-list-hero {
    padding-block: 1rem 1.75rem;
  }

  .article-hero,
  .article-masthead {
    padding-bottom: 1.25rem;
  }

  .promo-block {
    padding: 1.5rem;
  }

  .promo-block .btn {
    max-width: 100%;
    white-space: normal;
  }

  .prose th,
  .prose td {
    padding: 0.75rem;
  }
}

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

  .related-card:hover,
  .related-card:focus-within,
  .post-nav-card:hover,
  .blog-filters button:active {
    transform: none;
  }

  .blog-index,
  .blog-article {
    scroll-behavior: auto;
  }
}