/* VPNTF 阅读界面：错位色块与线路开关的纸面记录。 */
.blog-index,
.article-page {
  color: var(--ink);
  background: var(--bg);
}

.blog-index-inner {
  width: min(100%, calc(72rem + 2 * var(--gutter)));
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-bottom: clamp(3rem, 7vw, 6rem);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.breadcrumbs a {
  color: var(--ink);
  text-decoration: none;
}

.breadcrumbs a:hover,
.breadcrumbs a:focus-visible {
  color: var(--accent-dark);
  text-decoration: underline;
}

.blog-hero,
.article-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  width: min(100%, calc(56rem + 2 * var(--gutter)));
  max-width: calc(56rem + 2 * var(--gutter));
  margin-inline: auto;
  padding: clamp(2.5rem, 5vw, 4rem) var(--gutter);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--panel);
  box-shadow: var(--shadow-card);
}

.blog-hero::before,
.article-hero::before {
  position: absolute;
  z-index: -1;
  top: 0;
  right: 0;
  width: 47%;
  height: 73%;
  border-bottom-left-radius: var(--r-lg);
  background: color-mix(in srgb, var(--accent) 13%, var(--panel));
  content: "";
}

.blog-hero::after,
.article-hero::after {
  position: absolute;
  z-index: -1;
  right: 7%;
  bottom: 12%;
  width: 17%;
  height: 1px;
  background: var(--accent-dark);
  box-shadow: 0 0.5rem 0 var(--accent-dark), 0 1rem 0 var(--accent-dark);
  content: "";
}

.blog-kicker {
  display: inline-block;
  margin-bottom: 1.25rem;
  padding: 0.42rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.04em;
}

.blog-hero h1,
.article-hero h1 {
  max-width: 44rem;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.015em;
  line-height: 1.25;
  text-wrap: pretty;
  overflow-wrap: break-word;
}

.blog-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}

.article-hero h1 {
  font-size: clamp(1.85rem, 4vw, 2.6rem);
}

.blog-hero > p,
.article-hero > p {
  max-width: 42rem;
  margin: 1.25rem 0 0 0.75rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.blog-directory {
  margin-top: clamp(2.5rem, 5vw, 4rem);
}

.directory-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.25rem;
  margin-bottom: 1.25rem;
}

.directory-heading h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.6rem);
  font-weight: 900;
  letter-spacing: -0.015em;
  text-wrap: pretty;
}

.directory-heading p,
.filter-status {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 0.75rem;
}

.tag-filter {
  padding: 0.6rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--ink);
  font: inherit;
  font-size: 0.88rem;
  cursor: pointer;
  transition: border-color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.tag-filter:hover {
  border-color: var(--accent-dark);
  transform: translateY(-2px);
}

.tag-filter.is-active {
  border-color: var(--accent-dark);
  background: var(--ink);
  color: var(--on-ink);
}

.tag-filter:focus-visible,
.article-card a:focus-visible,
.related-card a:focus-visible,
.post-nav-card:focus-visible,
.float-cta:focus-visible {
  outline: 2px solid var(--accent-dark);
  outline-offset: 3px;
}

.filter-status {
  min-height: 1.5rem;
  margin-bottom: 1.25rem;
}

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

.article-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--r-md);
  background: var(--panel);
  box-shadow: var(--shadow-card);
  transition: border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

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

.article-card-meta,
.article-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.5rem;
}

.article-card-meta {
  margin-bottom: 1rem;
}

.article-tag,
.article-date,
.article-readtime {
  display: inline-block;
  padding: 0.32rem 0.7rem;
  border-radius: var(--r-pill);
  font-size: 0.76rem;
  line-height: 1.45;
}

.article-tag {
  background: var(--ink);
  color: var(--on-ink);
}

.article-date,
.article-readtime {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  font-family: var(--font-mono);
}

.article-card h3 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.12rem, 2vw, 1.3rem);
  font-weight: 800;
  line-height: 1.5;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

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

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

.article-card > p {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.8;
}

.article-read {
  width: fit-content;
  margin-top: auto;
  color: var(--accent-dark);
  font-weight: 700;
  text-decoration: none;
}

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

.blog-empty {
  grid-column: 1 / -1;
  padding: 2rem;
  border: 1px dashed var(--border);
  border-radius: var(--r-md);
  background: var(--panel);
  color: var(--muted);
}

.article-column {
  width: min(100%, calc(56rem + 2 * var(--gutter)));
  max-width: calc(56rem + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.article-column > .breadcrumbs {
  margin-top: 1.5rem;
}

.article-hero {
  width: calc(100% + 2 * var(--gutter));
  margin-inline: calc(-1 * var(--gutter));
  margin-bottom: 1.5rem;
}

.article-hero-meta {
  margin-bottom: 1.25rem;
}

.reading-wrap {
  width: min(100%, calc(56rem + 2 * var(--gutter)));
  max-width: calc(56rem + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.article-body {
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.9;
  overflow-wrap: break-word;
  counter-reset: article-section;
}

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

.article-body p,
.article-body ul,
.article-body ol,
.article-body blockquote {
  margin: 0 0 1.35rem;
}

.article-body h2,
.article-body h3,
#related-posts h2 {
  font-family: var(--font-display);
  font-weight: 850;
  letter-spacing: -0.01em;
  line-height: 1.4;
  text-wrap: pretty;
  overflow-wrap: break-word;
}

.article-body h2 {
  margin: 2.5rem 0 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  font-size: clamp(1.35rem, 2.5vw, 1.6rem);
  counter-increment: article-section;
}

.article-body h2::before {
  display: inline-block;
  margin-right: 0.75rem;
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  vertical-align: 0.12em;
  content: counter(article-section, decimal-leading-zero) " /";
}

.article-body h3 {
  margin: 1.75rem 0 0.75rem;
  font-size: clamp(1.12rem, 2vw, 1.3rem);
}

.article-body a {
  color: var(--accent-dark);
  text-underline-offset: 0.2em;
}

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

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

.article-body blockquote {
  padding: 1.25rem 1.5rem;
  border-left: 3px solid var(--accent-dark);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--panel-2);
  color: var(--muted);
}

.article-body code {
  overflow-wrap: anywhere;
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.article-body :not(pre) > code {
  padding: 0.12em 0.35em;
  border-radius: var(--r-sm);
  background: var(--panel-2);
  color: var(--accent-dark);
}

.article-body pre {
  position: relative;
  max-width: 100%;
  margin: 1.5rem 0;
  padding: 2.5rem 1.25rem 1.25rem;
  overflow-x: auto;
  border-radius: var(--r-md);
  background: var(--ink);
  color: var(--on-ink);
  box-shadow: var(--shadow-deep);
}

.article-body pre::before {
  position: absolute;
  top: 0.85rem;
  left: 1.25rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0.85rem 0 var(--warn), 1.7rem 0 var(--success);
  content: "";
}

.article-body pre code {
  color: inherit;
  white-space: pre;
  overflow-wrap: normal;
}

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

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  line-height: 1.65;
}

.article-body th,
.article-body td {
  min-width: 7rem;
  padding: 0.8rem 1rem;
  text-align: left;
}

.article-body thead th {
  background: var(--ink);
  color: var(--on-ink);
  font-weight: 700;
}

.article-body tbody tr {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

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

.article-body tbody tr:hover {
  background: color-mix(in srgb, var(--accent) 9%, var(--panel));
}

.article-body .callout {
  position: relative;
  margin: 1.5rem 0;
  padding: 1.1rem 1.25rem 1.1rem 3.4rem;
  border-left: 4px solid var(--accent-dark);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: color-mix(in srgb, var(--accent) 9%, var(--panel));
}

.article-body .callout::before {
  position: absolute;
  top: 1.15rem;
  left: 1rem;
  display: grid;
  width: 1.5rem;
  height: 1.5rem;
  place-items: center;
  border-radius: var(--r-sm);
  background: var(--accent-dark);
  color: var(--on-ink);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  content: "i";
}

.article-body .callout.warning {
  border-left-color: var(--warn);
  background: color-mix(in srgb, var(--warn) 12%, var(--panel));
}

.article-body .callout.warning::before {
  background: var(--warn);
  color: var(--ink);
  content: "!";
}

.article-body .callout.success {
  border-left-color: var(--success);
  background: color-mix(in srgb, var(--success) 10%, var(--panel));
}

.article-body .callout.success::before {
  background: var(--success);
  content: "+";
}

.article-body .stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.article-body .stat-card {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent-dark);
  border-radius: var(--r-sm);
  background: color-mix(in srgb, var(--accent) 7%, var(--panel));
}

.article-body .stat-card:nth-child(even) {
  border-top-color: var(--ink);
  background: var(--panel-2);
}

.article-body .stat-num {
  display: block;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 700;
  line-height: 1.4;
}

.article-body .stat-label {
  display: block;
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.6;
}

.article-body .check-list {
  display: grid;
  gap: 0.6rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}

.article-body .check-list li {
  margin: 0;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--panel);
  list-style: none;
}

.article-body .verdict {
  margin: 1.5rem 0;
  padding: 1.1rem 1.25rem;
  border-left: 4px solid var(--accent-dark);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--panel-2);
}

.article-body .verdict strong {
  color: var(--ink);
}

.promo-block {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 2.5rem 0 1rem;
  padding: 1.75rem 2rem;
  border: 1px solid var(--ink);
  border-radius: var(--r-md);
  background: var(--ink);
  color: var(--on-ink);
  box-shadow: var(--shadow-deep);
}

.promo-block::before {
  position: absolute;
  z-index: -1;
  top: -2rem;
  right: -1rem;
  width: 12rem;
  height: 12rem;
  border: 1.5rem solid color-mix(in srgb, var(--accent) 26%, var(--ink));
  border-radius: 50%;
  content: "";
}

.promo-block h2 {
  margin: 0 0 0.4rem;
  color: var(--on-ink);
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.promo-block p {
  max-width: 34rem;
  margin: 0;
  color: var(--on-ink);
  font-size: 0.94rem;
  line-height: 1.7;
}

.promo-block .btn-hot {
  position: relative;
  border: 1px solid var(--panel);
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
}

.promo-block .btn-hot:hover {
  background: var(--panel-2);
}

.promo-block .btn-line {
  position: relative;
  border-color: var(--on-ink);
  background: transparent;
  color: var(--on-ink);
}

#related-posts {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

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

#related-posts h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.35rem, 2.5vw, 1.6rem);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.related-card {
  min-width: 0;
  border: 1px solid var(--border);
  border-top: 3px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--panel);
  transition: border-color 180ms ease, transform 180ms ease;
}

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

.related-card a {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1.1rem;
  color: var(--ink);
  text-decoration: none;
}

.related-meta {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.6;
}

.related-card h3 {
  margin: 0.65rem 0;
  font-size: 1.05rem;
  line-height: 1.5;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  overflow-wrap: anywhere;
}

.related-card p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.7;
}

.related-cue {
  margin-top: auto;
  color: var(--accent-dark);
  font-size: 0.84rem;
  font-weight: 700;
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
  padding-bottom: 2rem;
}

.post-nav-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 0.45rem;
  padding: 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 180ms ease, transform 180ms ease;
}

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

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

.post-nav-label {
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.post-nav-card strong {
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.float-cta {
  position: fixed;
  z-index: 20;
  right: max(1rem, var(--gutter));
  bottom: max(1rem, env(safe-area-inset-bottom));
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  max-width: calc(100vw - 2rem);
  padding: 0.75rem 1.15rem;
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-pill);
  background: var(--grad-hot);
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  box-shadow: var(--shadow-hot);
  transition: transform 180ms ease;
}

.float-cta:hover {
  transform: translateY(-3px);
}

.float-cta svg {
  flex: none;
  width: 1.15rem;
  height: 1.15rem;
}

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

  .related-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

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

  .blog-hero,
  .article-hero {
    padding-block: 2rem;
  }

  .blog-hero > p,
  .article-hero > p {
    margin-left: 0;
  }

  .blog-hero::before,
  .article-hero::before {
    width: 55%;
    height: 55%;
  }

  .promo-block {
    padding: 1.5rem;
  }

  .float-cta {
    right: 0.75rem;
    bottom: max(0.75rem, env(safe-area-inset-bottom));
    padding: 0.65rem 0.9rem;
    font-size: 0.85rem;
  }

  .no-break {
    white-space: normal;
  }
}

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