:root {
  --blog-read: 56rem;
  --blog-pad: clamp(1.25rem, 4vw, 2rem);
  --blog-gap: 1.5rem;
  --blog-ink-soft: color-mix(in srgb, var(--ink) 88%, var(--panel));
  --blog-accent-wash: color-mix(in srgb, var(--accent) 8%, var(--panel));
  --blog-accent-line: color-mix(in srgb, var(--accent) 32%, var(--border));
  --blog-success-wash: color-mix(in srgb, var(--success) 10%, var(--panel));
  --blog-warn-wash: color-mix(in srgb, var(--warn) 12%, var(--panel));
  --blog-row: color-mix(in srgb, var(--panel-2) 35%, var(--panel));
  --blog-shadow: 0 20px 52px color-mix(in srgb, var(--ink) 12%, transparent);
  --blog-overlay: color-mix(in srgb, var(--ink) 62%, transparent);
  --blog-white: #ffffff;
  --blog-mono-light: #e5f0f1;
  --blog-transition: 180ms ease;
}

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

.blog-page *,
.blog-page *::before,
.blog-page *::after {
  box-sizing: border-box;
}

.blog-page .no-break {
  white-space: nowrap;
}

.blog-index-wrap {
  width: min(100%, 76rem);
  margin-inline: auto;
  padding-inline: var(--blog-pad);
  padding-bottom: 5rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  width: min(100%, calc(var(--blog-read) + 2 * var(--blog-pad)));
  margin: 0 auto;
  padding: 1.5rem var(--blog-pad) 0;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

.blog-index-wrap > .breadcrumbs {
  width: 100%;
  padding-inline: 0;
}

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

.breadcrumbs a:hover {
  color: var(--accent-dark);
  text-decoration-color: currentColor;
}

.breadcrumbs [aria-current="page"] {
  overflow-wrap: anywhere;
}

.blog-kicker,
.blog-modal-eyebrow {
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.blog-index-hero {
  position: relative;
  overflow: hidden;
  margin-top: 1.75rem;
  padding: clamp(2rem, 6vw, 4.5rem) var(--blog-pad);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: linear-gradient(140deg, var(--sky-top), var(--sky-bottom));
}

.blog-index-hero::after {
  position: absolute;
  right: 1.75rem;
  bottom: 1.5rem;
  width: 5rem;
  height: 5rem;
  border: 1px solid var(--border);
  border-radius: 50%;
  box-shadow: inset 0 0 0 0.55rem var(--sky-bottom), inset 0 0 0 0.62rem var(--border);
  content: "";
  pointer-events: none;
}

.blog-index-hero h1 {
  max-width: 14ch;
  margin: 0.75rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  text-wrap: pretty;
}

.blog-index-hero p {
  max-width: 44rem;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.blog-directory {
  padding-top: clamp(2.5rem, 6vw, 4rem);
}

.blog-directory-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
}

.blog-directory-heading h2 {
  margin: 0.45rem 0 0;
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.blog-directory-heading p {
  margin: 0 0 0.15rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 1.75rem 0 1.4rem;
}

.blog-filters button {
  min-height: 2.75rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color var(--blog-transition), background-color var(--blog-transition);
}

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

.blog-filters button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--blog-accent-wash);
  color: var(--accent-dark);
  font-weight: 700;
}

.blog-card-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--blog-gap);
}

.blog-card-grid > .blog-list-status {
  grid-column: 1 / -1;
}

.blog-list-status {
  padding: 1.25rem;
  border: 1px dashed var(--border);
  border-radius: var(--r-sm);
  color: var(--muted);
  line-height: 1.7;
}

.blog-page .article-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--panel);
  box-shadow: 0 1px 0 var(--blog-white) inset;
  transition: border-color var(--blog-transition), transform var(--blog-transition), box-shadow var(--blog-transition);
}

.blog-page .article-card::before {
  position: absolute;
  top: 0;
  right: 1.5rem;
  left: 1.5rem;
  height: 2px;
  border-radius: var(--r-pill);
  background: var(--accent);
  content: "";
  opacity: 0;
  transition: opacity var(--blog-transition);
}

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

.blog-page .article-card:hover::before,
.blog-page .article-card:focus-within::before {
  opacity: 1;
}

.blog-card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
}

.blog-card-meta .tag,
.article-meta .tag {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border-radius: var(--r-pill);
  background: var(--blog-accent-wash);
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 700;
}

.article-date {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.blog-page .article-card h3 {
  margin: 1rem 0 0.7rem;
  font-size: clamp(1.08rem, 2vw, 1.3rem);
  line-height: 1.48;
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
  text-wrap: pretty;
}

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

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

.blog-page .article-card p {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.75;
}

.blog-read-link {
  align-self: flex-start;
  margin-top: auto;
  color: var(--accent-dark);
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: underline;
  text-decoration-color: var(--blog-accent-line);
  text-underline-offset: 0.25em;
}

.blog-read-link:hover {
  text-decoration-color: currentColor;
}

/* 文章页所有阅读区共用同一条列，内衬与 hero 保持一致。 */
.blog-page .reading-wrap,
.blog-page .article-hero,
.blog-page .article-breadcrumbs,
.blog-page .promo-block,
.blog-page #related-posts,
.blog-page #post-nav {
  width: min(100%, calc(var(--blog-read) + 2 * var(--blog-pad)));
  max-width: calc(var(--blog-read) + 2 * var(--blog-pad));
  margin-inline: auto;
  padding-inline: var(--blog-pad);
}

.article-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(11rem, 1fr);
  align-items: start;
  gap: clamp(2rem, 4vw, 3rem);
  margin-top: 1.5rem;
  padding-block: clamp(1.75rem, 4vw, 2.75rem);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--panel), var(--sky-bottom));
  box-shadow: 0 1px 0 var(--blog-white) inset;
}

.article-hero::before {
  position: absolute;
  top: 1rem;
  bottom: 1rem;
  left: 0;
  width: 3px;
  border-radius: var(--r-pill);
  background: var(--accent);
  content: "";
}

.article-hero-main {
  min-width: 0;
}

.article-hero .blog-kicker {
  display: inline-block;
  margin-bottom: 0.85rem;
}

.article-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3.7vw, 2.6rem);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.02em;
  overflow-wrap: anywhere;
  text-wrap: pretty;
}

.article-hero-main > p {
  margin: 1.15rem 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.article-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--panel);
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

.article-meta > :not(:last-child) {
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--panel-2);
}

.article-meta time,
.article-meta .read-time {
  display: block;
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.blog-page .reading-wrap {
  padding-top: 1.3rem;
  padding-bottom: 1.5rem;
}

.blog-page .prose {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.85;
  overflow-wrap: break-word;
}

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

.prose h2 {
  margin: 2.7rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  font-size: clamp(1.3rem, 2.6vw, 1.6rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

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

.prose h2::before {
  counter-increment: article-section;
  display: inline-block;
  margin-right: 0.7rem;
  color: var(--accent-dark);
  content: counter(article-section, decimal-leading-zero) " /";
  font-family: var(--font-mono);
  font-size: 0.72em;
  vertical-align: 0.08em;
}

.prose h3 {
  margin: 1.9rem 0 0.7rem;
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  line-height: 1.45;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose pre,
.prose .table-scroll,
.prose .stat-grid,
.prose .check-list,
.prose .verdict,
.prose .callout {
  margin-block: 1.15rem;
}

.prose ul,
.prose ol {
  padding-left: 1.5rem;
}

.prose li + li {
  margin-top: 0.55rem;
}

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

.prose a:hover {
  text-decoration-color: currentColor;
}

.prose blockquote {
  padding: 0.2rem 1.3rem;
  border-left: 3px solid var(--border);
  color: var(--muted);
  font-size: 1.05rem;
}

.prose pre {
  position: relative;
  max-width: 100%;
  overflow-x: auto;
  padding: 2.75rem 1.25rem 1.2rem;
  border-radius: var(--r-sm);
  background: var(--blog-ink-soft);
  color: var(--blog-mono-light);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.7;
  white-space: pre;
}

.prose pre::before {
  position: absolute;
  top: 0.9rem;
  left: 1.2rem;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 1rem 0 var(--warn), 2rem 0 var(--success);
  content: "";
}

.prose pre code {
  padding: 0;
  background: none;
  color: inherit;
  font: inherit;
}

.prose :not(pre) > code {
  padding: 0.15em 0.35em;
  border-radius: var(--r-xs);
  background: var(--panel-2);
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.prose .table-scroll {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}

.prose table {
  width: 100%;
  min-width: 36rem;
  border-collapse: collapse;
  font-size: 0.92rem;
  line-height: 1.6;
}

.prose th,
.prose td {
  padding: 0.75rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.prose thead {
  background: var(--ink);
  color: var(--blog-white);
}

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

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

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

.prose .stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr));
  gap: 0.85rem;
}

.prose .stat-card {
  min-width: 0;
  padding: 1.2rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--r-sm);
  background: var(--blog-accent-wash);
}

.prose .stat-card:nth-child(even) {
  border-top-color: var(--ink);
  background: var(--panel);
}

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

.prose .stat-num {
  display: block;
  color: var(--text);
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3vw, 1.85rem);
  font-weight: 800;
  line-height: 1.25;
}

.prose .stat-label {
  display: block;
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.5;
}

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

.prose .check-list li {
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-xs);
  background: var(--panel);
  list-style: none;
}

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

.prose .check-list li::marker {
  content: "";
}

.prose .verdict {
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--blog-accent-wash);
  line-height: 1.8;
}

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

.prose .callout {
  position: relative;
  padding: 1rem 1.2rem 1rem 3.2rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--blog-accent-wash);
}

.prose .callout::before {
  position: absolute;
  top: 1.15rem;
  left: 1rem;
  display: grid;
  width: 1.35rem;
  height: 1.35rem;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  color: var(--accent-dark);
  content: "i";
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  line-height: 1;
}

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

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

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

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

.prose .callout p:first-child,
.prose .verdict p:first-child {
  margin-top: 0;
}

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

.blog-page .promo-block {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 1.5rem;
  padding-block: 1.65rem;
  border: 1px solid var(--ink);
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--ink), var(--side-top));
  color: var(--blog-white);
}

.blog-page .promo-block::before {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  bottom: 0.75rem;
  left: 0.75rem;
  border: 1px solid color-mix(in srgb, var(--blog-white) 20%, transparent);
  border-radius: var(--r-sm);
  content: "";
  pointer-events: none;
}

.blog-page .promo-block > * {
  position: relative;
  z-index: 1;
}

.blog-page .promo-block h2 {
  margin: 0 0 0.45rem;
  color: var(--blog-white);
  font-size: 1.45rem;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.blog-page .promo-block p {
  margin: 0;
  color: var(--blog-mono-light);
  font-size: 0.94rem;
  line-height: 1.7;
}

.blog-page .promo-block .btn-main,
.blog-modal-panel .btn-main {
  flex: none;
  border: 1px solid var(--blog-white);
  background: var(--blog-white);
  color: var(--accent-dark);
  box-shadow: none;
}

.blog-page .promo-block .btn-main:hover,
.blog-modal-panel .btn-main:hover {
  border-color: var(--blog-mono-light);
  background: var(--blog-mono-light);
  color: var(--accent-dark);
}

.blog-page #related-posts {
  padding-top: 2.5rem;
}

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

#related-posts > h2 {
  margin: 0 0 1.1rem;
  font-size: 1.45rem;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

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

.post-nav-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 0.45rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  transition: transform var(--blog-transition), border-color var(--blog-transition);
}

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

.post-nav-direction {
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.77rem;
}

.post-nav-card strong {
  font-size: 0.94rem;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

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

.blog-modal-overlay {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  background: var(--blog-overlay);
  opacity: 0;
  transition: opacity var(--blog-transition);
}

.blog-modal-overlay.is-open {
  opacity: 1;
}

.blog-modal-panel {
  position: relative;
  width: min(100%, 28rem);
  padding: 2.4rem clamp(1.5rem, 5vw, 2.5rem);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--panel);
  box-shadow: var(--blog-shadow);
  transform: translateY(0.6rem);
  transition: transform var(--blog-transition);
}

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

.blog-modal-panel::before {
  position: absolute;
  top: 0;
  right: 1.5rem;
  left: 1.5rem;
  height: 3px;
  border-radius: var(--r-pill);
  background: var(--accent);
  content: "";
}

.blog-modal-close {
  position: absolute;
  top: 0.7rem;
  right: 0.8rem;
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

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

.blog-modal-panel h2 {
  margin: 0.7rem 0;
  color: var(--text);
  font-size: 1.75rem;
}

.blog-modal-panel p {
  margin: 0 0 1.4rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.blog-page :focus-visible,
.blog-modal-overlay :focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

@media (max-width: 860px) {
  .prose table:not(.table-scroll table) {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
  }
}

@media (max-width: 768px) {
  .blog-card-grid,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .article-hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.25rem;
  }

  .article-meta {
    order: -1;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
  }

  .article-meta > :not(:last-child) {
    padding-bottom: 0;
    border-bottom: 0;
  }

  .article-meta time,
  .article-meta .read-time {
    width: auto;
  }

  .blog-directory-heading {
    align-items: start;
    flex-direction: column;
  }
}

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

  .blog-index-hero::after {
    display: none;
  }

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

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

  .article-meta {
    font-size: 0.78rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .blog-page .article-card,
  .blog-filters button,
  .post-nav-card,
  .blog-modal-overlay,
  .blog-modal-panel {
    transition: none;
  }

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