:root {
  --blog-column: 56rem;
  --blog-glaze: color-mix(in srgb, var(--leaf-50) 48%, var(--bg-panel));
  --blog-stripe: color-mix(in srgb, var(--accent) 63%, var(--accent-lime));
  --blog-hairline: color-mix(in srgb, var(--border) 75%, var(--bg-panel));
  --blog-ink-wash: color-mix(in srgb, var(--ink-deep) 92%, var(--bg));
  --blog-code-text: var(--bg-panel);
  --blog-soft-success: color-mix(in srgb, var(--success) 10%, var(--bg-panel));
  --blog-soft-warn: color-mix(in srgb, var(--warn) 12%, var(--bg-panel));
  --blog-hover: color-mix(in srgb, var(--leaf-50) 65%, var(--bg-panel));
}

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

.blog-crumbs {
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

.blog-crumbs a {
  color: var(--accent-dark);
  text-decoration: none;
}

.blog-crumbs a:hover,
.blog-crumbs a:focus-visible {
  text-decoration: underline;
}

.blog-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin-bottom: 2rem;
  padding: clamp(2rem, 5vw, 3.5rem);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--bg-panel);
  box-shadow: var(--shadow-ink);
}

.blog-hero::before {
  content: "";
  position: absolute;
  inset: 1rem auto 1rem 0.75rem;
  width: 0.3rem;
  border-radius: var(--r-pill);
  background: linear-gradient(var(--accent), var(--accent-lime));
}

.blog-hero__eyebrow,
.blog-catalog__index {
  margin: 0 0 1rem;
  color: var(--accent-dark);
  font: 0.75rem/1.5 var(--f-mono);
  letter-spacing: 0.08em;
}

.blog-hero h1 {
  max-width: 18ch;
  margin: 0 0 1rem;
  color: var(--text);
  font-family: var(--f-display);
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-wrap: pretty;
}

.blog-hero > p:last-child {
  max-width: 39rem;
  margin: 0;
  color: var(--text-muted);
  font-size: 1.0625rem;
  line-height: 1.8;
}

.blog-catalog {
  padding-bottom: 2rem;
}

.blog-catalog__intro {
  display: flex;
  justify-content: space-between;
  align-items: end;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin: 0 0 1.25rem;
}

.blog-catalog__index {
  margin-bottom: 0.25rem;
}

.blog-catalog__intro h2 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.35rem, 3vw, 1.8rem);
  line-height: 1.4;
  text-wrap: pretty;
}

.blog-catalog__intro > p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.7;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.blog-filter {
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--text-muted);
  font: 600 0.875rem/1.4 var(--f-body);
  cursor: pointer;
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

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

.blog-filter.is-active {
  border-color: var(--accent-dark);
  background: var(--accent-dark);
  color: var(--bg-panel);
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.article-card {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  box-shadow: var(--shadow-ink);
  transition: border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.article-card:hover,
.article-card:focus-within {
  border-color: var(--accent);
  transform: translateY(-0.2rem);
  box-shadow: var(--shadow-leaf);
}

.article-card__link {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1.5rem;
  color: inherit;
  text-decoration: none;
}

.article-card__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
  font-size: 0.8rem;
}

.article-card__date {
  color: var(--text-muted);
  font-family: var(--f-mono);
}

.article-card__tag {
  padding: 0.2rem 0.6rem;
  border-radius: var(--r-pill);
  background: var(--leaf-50);
  color: var(--accent-dark);
  font-weight: 700;
}

.article-card__title {
  margin: 0 0 0.75rem;
  color: var(--text);
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  line-height: 1.48;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.article-card__summary {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.article-card__action {
  margin-top: auto;
  color: var(--accent-dark);
  font-size: 0.875rem;
  font-weight: 700;
}

.article-card__action::after,
.related-card__action::after {
  content: " →";
}

.blog-empty {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  color: var(--text-muted);
}

.blog-list-note {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 1rem 0 4rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel2);
}

.blog-list-note strong {
  color: var(--text);
}

.blog-list-note p {
  max-width: 37rem;
  margin: 0.45rem 0 0;
  color: var(--text-muted);
  line-height: 1.75;
}

.blog-list-page .float-cta {
  display: none;
}

/* 文章的四段内容沿用同一条阅读列；hero 与正文保持等宽内衬。 */
.article-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin-bottom: 1.5rem;
  padding: clamp(1.75rem, 4vw, 3rem) clamp(1.5rem, 4vw, 3rem);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, var(--blog-glaze), var(--bg-panel));
  box-shadow: var(--shadow-ink);
}

.article-hero::before {
  content: "";
  position: absolute;
  top: 1.125rem;
  bottom: 1.125rem;
  left: 0.75rem;
  width: 0.35rem;
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, var(--accent), var(--accent-lime));
}

.article-hero__meta {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.article-hero__meta > * {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--text-muted);
  font: 600 0.8rem/1.5 var(--f-body);
}

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

.article-hero__meta .article-hero__tag {
  border-color: var(--accent-dark);
  background: var(--accent-dark);
  color: var(--bg-panel);
}

.article-hero h1 {
  margin: 0 0 1rem;
  color: var(--text);
  font-family: var(--f-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.3;
  letter-spacing: -0.02em;
  text-wrap: pretty;
}

.article-hero__summary {
  max-width: 43rem;
  margin: 0;
  color: var(--text-muted);
  font-size: 1.0625rem;
  line-height: 1.85;
}

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

.reading-wrap .prose,
.reading-wrap.prose,
.prose {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.9;
  overflow-wrap: break-word;
}

.prose {
  counter-reset: article-section;
}

.prose h2 {
  counter-increment: article-section;
  margin: 2.35rem 0 0.9rem;
  color: var(--text);
  font-size: clamp(1.35rem, 2.5vw, 1.6rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

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

.prose h2::before {
  content: counter(article-section, decimal-leading-zero) " / ";
  color: var(--accent-dark);
  font: 600 0.8rem/1 var(--f-mono);
  letter-spacing: 0;
  vertical-align: 0.12em;
}

.prose h3 {
  margin: 1.8rem 0 0.65rem;
  color: var(--text);
  font-size: clamp(1.12rem, 2vw, 1.3rem);
  line-height: 1.5;
  text-wrap: pretty;
}

.prose p,
.prose ul,
.prose ol,
.prose blockquote {
  margin-block: 0.85rem 1.3rem;
}

.prose ul,
.prose ol {
  padding-left: 1.6rem;
}

.prose li + li {
  margin-top: 0.4rem;
}

.prose a {
  color: var(--accent-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.prose blockquote {
  padding: 0.75rem 1.25rem;
  border-left: 0.25rem solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--blog-glaze);
  color: var(--text);
  font-style: italic;
}

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

.prose :not(pre) > code {
  padding: 0.15rem 0.35rem;
  border-radius: var(--r-xs);
  background: var(--bg-panel2);
  color: var(--accent-dark);
  font: 0.88em/1.5 var(--f-mono);
  overflow-wrap: anywhere;
}

.prose pre {
  position: relative;
  overflow-x: auto;
  margin: 1.5rem 0;
  padding: 2.6rem 1.25rem 1.25rem;
  border: 1px solid var(--ink-deep);
  border-radius: var(--r-md);
  background: var(--blog-ink-wash);
  color: var(--blog-code-text);
  box-shadow: var(--shadow-ink-2);
  font: 0.875rem/1.75 var(--f-mono);
  tab-size: 2;
}

.prose pre::before {
  content: "●  ●  ●";
  position: absolute;
  top: 0.6rem;
  left: 1.25rem;
  color: var(--accent-lime);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
}

.prose pre code {
  color: inherit;
  font: inherit;
}

.table-scroll {
  max-width: 100%;
  margin: 1.5rem 0;
  overflow-x: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
}

.prose table,
.prose > .data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-panel);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.prose th {
  background: var(--ink-deep);
  color: var(--bg-panel);
  text-align: left;
  font-weight: 700;
}

.prose th,
.prose td {
  padding: 0.8rem 1rem;
  min-width: 8rem;
  border-bottom: 1px solid var(--blog-hairline);
  vertical-align: top;
}

.prose tbody tr:nth-child(even) {
  background: var(--bg-panel2);
}

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

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  gap: 0.85rem;
  margin: 1.5rem 0;
}

.stat-card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-top: 0.25rem solid var(--accent);
  border-radius: var(--r-md);
  background: var(--blog-glaze);
}

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

.stat-card:nth-child(3n) {
  border-top-color: var(--warn);
  background: var(--blog-soft-warn);
}

.stat-num,
.stat-label {
  display: block;
}

.stat-num {
  margin-bottom: 0.25rem;
  color: var(--text);
  font: 800 clamp(1.4rem, 3vw, 2rem)/1.25 var(--f-display);
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.65;
}

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

.check-list li {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-panel);
  list-style: none;
}

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

.verdict {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-left: 0.3rem solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--blog-glaze);
  color: var(--text);
  line-height: 1.85;
}

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

.callout {
  position: relative;
  margin: 1.5rem 0;
  padding: 1rem 1.25rem 1rem 3.25rem;
  border-left: 0.3rem solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--blog-glaze);
  color: var(--text);
}

.callout::before {
  content: "i";
  position: absolute;
  top: 1.1rem;
  left: 1rem;
  display: grid;
  place-items: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: var(--r-pill);
  background: var(--accent-dark);
  color: var(--bg-panel);
  font: 700 0.85rem/1 var(--f-mono);
}

.callout--warning,
.callout.warning {
  border-left-color: var(--warn);
  background: var(--blog-soft-warn);
}

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

.callout--success,
.callout.success {
  border-left-color: var(--success);
  background: var(--blog-soft-success);
}

.callout--success::before,
.callout.success::before {
  content: "✓";
  background: var(--success);
}

.article-end {
  margin-top: 2rem;
}

.promo-block {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding: clamp(1.5rem, 4vw, 2.25rem);
  border-radius: var(--r-lg);
  background: linear-gradient(120deg, var(--accent-dark), var(--accent));
  color: var(--bg-panel);
  box-shadow: var(--shadow-leaf);
}

.promo-block::after {
  content: "";
  position: absolute;
  right: -2rem;
  bottom: -6rem;
  z-index: -1;
  width: 15rem;
  height: 15rem;
  border: 1px solid var(--bg-panel);
  border-radius: var(--r-pill);
  opacity: 0.35;
  box-shadow: 0 0 0 1.5rem var(--blog-stripe), 0 0 0 3rem var(--accent-dark);
  pointer-events: none;
}

.promo-block strong {
  color: var(--bg-panel);
  font-size: 1.4rem;
}

.promo-block p {
  max-width: 34rem;
  margin: 0.45rem 0 0;
  color: var(--bg-panel);
  line-height: 1.7;
}

.promo-block .btn--go {
  flex-shrink: 0;
  border: 1px solid var(--bg-panel);
  background: var(--bg-panel);
  color: var(--accent-dark);
  box-shadow: var(--shadow-ink);
}

.promo-block .btn--go:hover,
.promo-block .btn--go:focus-visible {
  background: var(--leaf-50);
  color: var(--accent-dark);
}

.promo-block .btn--plan {
  border-color: var(--bg-panel);
  background: var(--accent-dark);
  color: var(--bg-panel);
}

#related-posts {
  padding-top: 2.25rem;
}

.related-posts__heading {
  margin: 0 0 1rem;
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1.4;
  text-wrap: pretty;
}

.related-posts__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.related-card,
.post-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  color: var(--text);
  text-decoration: none;
  transition: border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.related-card:hover,
.related-card:focus-visible,
.post-nav__link:hover,
.post-nav__link:focus-visible {
  border-color: var(--accent);
  transform: translateY(-0.2rem);
  box-shadow: var(--shadow-leaf);
}

.related-card__meta,
.post-nav__label {
  margin-bottom: 0.65rem;
  color: var(--accent-dark);
  font: 600 0.75rem/1.6 var(--f-mono);
}

.related-card__title,
.post-nav__title {
  color: var(--text);
  font-size: 0.9375rem;
  line-height: 1.6;
  text-wrap: pretty;
}

.related-card__action {
  margin-top: auto;
  padding-top: 1rem;
  color: var(--accent-dark);
  font-size: 0.8rem;
  font-weight: 700;
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  padding-top: 1.25rem;
  padding-bottom: 2.5rem;
}

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

.float-cta {
  position: fixed;
  right: max(var(--gutter), env(safe-area-inset-right));
  bottom: max(1.25rem, env(safe-area-inset-bottom));
  z-index: 30;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  max-width: calc(100vw - 2 * var(--gutter));
  padding: 0.8rem 1.15rem;
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-pill);
  background: var(--accent-dark);
  color: var(--bg-panel);
  box-shadow: var(--shadow-leaf-float);
  font: 700 0.875rem/1.4 var(--f-body);
  text-decoration: none;
}

.float-cta svg {
  width: 1.1rem;
  height: 1.1rem;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
}

.float-cta:hover,
.float-cta:focus-visible {
  background: var(--accent);
  color: var(--bg-panel);
}

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

@media (max-width: 640px) {
  .article-grid,
  .related-posts__grid,
  #post-nav {
    grid-template-columns: minmax(0, 1fr);
  }

  .post-nav__link--next {
    grid-column: 1;
  }

  .blog-hero {
    padding-inline: 1.75rem;
  }

  .article-hero {
    padding-inline: 1.75rem;
  }

  .article-hero::before,
  .blog-hero::before {
    left: 0.5rem;
  }

  .float-cta {
    right: var(--gutter);
    bottom: max(0.75rem, env(safe-area-inset-bottom));
    padding: 0.7rem 0.9rem;
    box-shadow: var(--shadow-leaf);
  }

  body:has(.float-cta) #post-nav {
    padding-bottom: 5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .blog-filter,
  .article-card,
  .related-card,
  .post-nav__link {
    transition: none;
  }

  .article-card:hover,
  .article-card:focus-within,
  .related-card:hover,
  .related-card:focus-visible,
  .post-nav__link:hover,
  .post-nav__link:focus-visible {
    transform: none;
  }
}