/* ==========================================================================
   VPNDX 博客样式包:列表页 + 文章页
   全部颜色 / 圆角 / 字体取自 base.css 的 :root 设计令牌
   ========================================================================== */

:root {
  --blog-reading: 56rem;
  --blog-half: 28rem;
}

/* --------------------------------------------------------------------------
   1. 阅读列:面包屑 / hero / 正文 / 文末推广共用同一条列并居中
   -------------------------------------------------------------------------- */

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

/* --------------------------------------------------------------------------
   2. 面包屑(与页头留出呼吸空间)
   -------------------------------------------------------------------------- */

.breadcrumb {
  padding-top: 1.6rem;
  font-size: .84rem;
  color: var(--muted);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  letter-spacing: .04em;
}

.breadcrumb__list li + li::before {
  content: "/";
  margin-right: .4rem;
  color: var(--border);
}

.breadcrumb__list a {
  color: var(--muted);
  text-decoration: none;
}

.breadcrumb__list a:hover {
  color: var(--accent);
}

.breadcrumb__list [aria-current="page"] {
  color: var(--text);
  max-width: 24em;
  overflow: hidden;
  text-overflow: ellips: nowrap;
}

/* --------------------------------------------------------------------------
   3. 列表页 hero:通栏色带 + 极淡方格母题
   -------------------------------------------------------------------------- */

.blog-hero {
  padding-block: clamp(2.4rem, 5vw, 3.6rem) clamp(1.8rem, 4vw, 2.6rem);
  border-bottom: 1px solid var(--border);
  background-color: var(--bg-top);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  background-size: 28px 28px, 28px 28px, 100% 100%;
}

.blog-hero__title {
  margin: .85rem 0 .7rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.16;
  text-wrap: pretty;
}

.blog-hero__lede {
  max-width: 34em;
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.75;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   4. 标签筛选栏
   -------------------------------------------------------------------------- */

.blog-body {
  padding-block: clamp(1.8rem, 3.5vw, 2.4rem) clamp(2.4rem, 5vw, 3.4rem);
}

.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.6rem;
}

.tag-btn {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .5rem .85rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.tag-btn:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.tag-btn.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--text);
}

/* --------------------------------------------------------------------------
   5. 文章卡列表
   -------------------------------------------------------------------------- */

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr));
  gap: 1.1rem;
}

.post-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.4rem 1.35rem 1.25rem;
  background: var(--panel);
  border-radius: var(--r);
  box-shadow: var(--shadow-accent);
  overflow: hidden;
  transition: transform .25s ease;
}

.post-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 72px;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--accent));
}

.post-card:hover {
  transform: translateY(-3px);
}

.post-card__tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  padding: .28rem .55rem;
  border-radius: var(--r-sm);
  background: color-mix(in srgb, var(--accent) 10%, var(--panel));
  color: var(--accent-dark);
}

.post-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -.01em;
}

.post-card__title a {
  color: var(--text);
  text-decoration: none;
}

.post-card__title a:hover {
  color: var(--accent);
}

.post-card__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--muted);
}

.post-card__sum {
  margin: 0;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--muted);
}

.post-card__more {
  margin-top: auto;
  padding-top: .5rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent-dark);
  text-decoration: none;
}

.post-card__more::after {
  content: " →";
}

.post-card__more:hover {
  color: var(--accent);
}

.post-empty {
  margin: 0;
  padding: 1.2rem 0;
  font-size: .95rem;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   6. 文章页 hero:通栏色带(full-bleed),文字仍在阅读列内
   -------------------------------------------------------------------------- */

.article-hero {
  padding-block: clamp(2.2rem, 4.5vw, 3.4rem) clamp(1.8rem, 3.6vw, 2.6rem);
  padding-inline: max(1.5rem, var(--gutter), calc(50% - var(--blog-half)));
  border-block: 1px solid var(--border);
  background-color: var(--bg-top);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  background-size: 28px 28px, 28px 28px, 100% 100%;
}

.article-hero__inner {
  max-width: var(--blog-reading);
  margin-inline: auto;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--muted);
}

.article-meta__dot {
  color: var(--border);
}

.article-hero__title {
  margin: 0 0 .9rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4.2vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.2;
  text-wrap: pretty;
}

.article-hero__lede {
  max-width: 40em;
  margin: 0;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   7. 正文排版
   -------------------------------------------------------------------------- */

.article-body {
  counter-reset: dxsec;
  padding-block: clamp(1.6rem, 3.5vw, 2.4rem) 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
}

.article-body p {
  margin: 0 0 1.15rem;
}

.article-body a {
  color: var(--accent-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.article-body a:hover {
  color: var(--accent);
}

.article-body strong {
  font-weight: 700;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.2rem;
  padding-left: 1.35rem;
}

.article-body li {
  margin-bottom: .5rem;
}

.article-body li::marker {
  color: var(--accent);
}

.article-body h2 {
  counter-increment: dxsec;
  margin: 2.4rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.4vw, 1.55rem);
  font-weight: 700;
  letter-spacing: -.015em;
  line-height: 1.35;
  text-wrap: pretty;
}

.article-body h2::before {
  content: counter(dxsec, decimal-leading-zero);
  display: inline-block;
  margin-right: .6rem;
  font-family: var(--font-mono);
  font-size: .78em;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--accent);
  vertical-align: .06em;
}

.article-body h3 {
  margin: 1.7rem 0 .7rem;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.4;
  text-wrap: pretty;
}

.article-body h3::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: .5rem;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--blue), var(--accent));
  vertical-align: .08em;
}

.article-body blockquote {
  margin: 1.6rem 0;
  padding: 1rem 1.2rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r) var(--r) 0;
  background: color-mix(in srgb, var(--accent) 6%, var(--panel));
}

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

.article-body code {
  font-family: var(--font-mono);
  font-size: .88em;
  padding: .12rem .38rem;
  border-radius: 3px;
  background: var(--panel-2);
  color: var(--accent-dark);
  overflow-wrap: anywhere;
}

.article-body pre {
  position: relative;
  margin: 1.5rem 0;
  padding: 2.5rem 1.2rem 1.15rem;
  background: var(--terminal);
  color: var(--terminal-text);
  border-radius: var(--r);
  box-shadow: var(--shadow-deep);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.article-body pre::before {
  content: "";
  position: absolute;
  top: .95rem;
  left: 1.15rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--error);
  box-shadow: 17px 0 0 var(--warn), 34px 0 0 var(--success);
}

.article-body pre code {
  display: block;
  padding: 0;
  background: none;
  color: inherit;
  font-size: .86rem;
  line-height: 1.75;
  white-space: pre;
}

/* 表格:实色表头 + 斑马纹 + hover,窄屏可横滑 */
.table-scroll {
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.article-body table {
  width: 100%;
  margin: 1.6rem 0;
  border-collapse: collapse;
  font-size: .94rem;
}

.article-body thead th {
  padding: .7rem .85rem;
  background: var(--text);
  color: var(--panel);
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-align: left;
  white-space: nowrap;
}

.article-body tbody td {
  padding: .72rem .85rem;
  border-bottom: 1px solid var(--border);
  word-break: keep-all;
  vertical-align: top;
}

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

.article-body tbody tr:hover {
  background: color-mix(in srgb, var(--blue) 12%, var(--panel));
}

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

/* callout:左色条 + 伪元素图标徽 */
.callout {
  position: relative;
  margin: 1.6rem 0;
  padding: 1.05rem 1.15rem 1.05rem 3.1rem;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r) var(--r) 0;
  background: color-mix(in srgb, var(--blue) 8%, var(--panel));
  font-size: .96rem;
  line-height: 1.78;
}

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

.callout::before {
  content: "i";
  position: absolute;
  top: 1.05rem;
  left: .95rem;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: var(--panel);
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  font-style: normal;
}

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

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

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

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

/* 数据卡网格:三档糖果底色轮换 */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  gap: .8rem;
  margin: 1.6rem 0;
}

.stat-card {
  position: relative;
  padding: 1.05rem 1.05rem .95rem;
  background: var(--panel);
  border-radius: var(--r);
  box-shadow: var(--shadow-accent);
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--accent));
}

.stat-card:nth-child(3n + 2) {
  background: var(--candy-blue);
}

.stat-card:nth-child(3n) {
  background: var(--candy-pink);
}

.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--accent-dark);
}

.stat-label {
  display: block;
  margin-top: .25rem;
  font-size: .84rem;
  line-height: 1.6;
  color: var(--muted);
}

/* 勾叉清单:只做容器与行卡装饰,勾叉符号由 li 文本自带 */
.check-list {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  display: grid;
  gap: .55rem;
}

.check-list li {
  margin: 0;
  padding: .8rem 1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  font-size: .95rem;
  line-height: 1.75;
}

.check-list li::marker {
  content: none;
}

/* 结论块 */
.verdict {
  margin: 1.6rem 0;
  padding: 1.05rem 1.2rem;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r) var(--r) 0;
  background: color-mix(in srgb, var(--accent) 7%, var(--panel));
  font-size: .97rem;
  line-height: 1.8;
}

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

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

/* --------------------------------------------------------------------------
   8. 文末推广卡(全页唯一)
   -------------------------------------------------------------------------- */

.promo-block.article-promo {
  display: block;
  margin-block: clamp(2rem, 4vw, 2.8rem) 0;
  padding-block: 0;
  background: none;
  border: 0;
  box-shadow: none;
}

.article-promo__card {
  padding: clamp(1.4rem, 3vw, 2rem);
  border-radius: var(--r);
  background: linear-gradient(135deg, var(--accent-dark), var(--accent) 55%, var(--blue));
  color: var(--panel);
  box-shadow: var(--shadow-accent);
}

.article-promo__brand {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.article-promo__text {
  max-width: 34em;
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--panel);
}

.article-promo__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.article-promo__actions .btn {
  flex-shrink: 0;
  white-space: nowrap;
}

.article-promo__actions .btn-primary {
  background: var(--panel);
  color: var(--text);
}

.article-promo__actions .btn-secondary {
  background: transparent;
  color: var(--panel);
  border: 1px solid color-mix(in srgb, var(--panel) 62%, transparent);
}

.article-promo__actions .btn-secondary:hover {
  background: color-mix(in srgb, var(--panel) 14%, transparent);
  color: var(--panel);
}

/* --------------------------------------------------------------------------
   9. 延伸阅读 + 上一篇/下一篇(垫距之和 ≤5rem,不叠出空洞)
   -------------------------------------------------------------------------- */

#related-posts {
  padding-top: clamp(1.6rem, 3vw 2.2rem);
  padding-bottom: 0;
}

.related-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  font-weight: 700;
  letter-spacing: -.015em;
  text-wrap: pretty;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: .85rem;
}

.related-card {
  position: relative;
  padding: 1.1rem 1.1rem 1rem;
  background: var(--panel);
  border-radius: var(--r);
  box-shadow: var(--shadow-accent);
  overflow: hidden;
  transition: transform .22s ease;
}

.related-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}

.related-card:hover {
  transform: translateY(-3px);
}

.related-card:hover::before {
  transform: scaleX(1);
}

.related-card__tag {
  display: inline-block;
  margin-bottom: .5rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .12em;
  padding: .24rem .5rem;
  border-radius: var(--r-sm);
  background: color-mix(in srgb, var(--accent) 10%, var(--panel));
  color: var(--accent-dark);
}

.related-card__title {
  margin: 0 0 .4rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
}

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

.related-card__title a:hover {
  color: var(--accent);
}

.related-card__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--muted);
}

#post-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: .85rem;
  padding-top: clamp(1.4rem, 2.6vw, 1.8rem);
  padding-bottom: clamp(1.6rem, 3vw, 2.2rem);
}

.post-nav__link {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1rem 1.1rem;
  background: var(--panel-2);
  border-radius: var(--r);
  text-decoration: none;
  transition: background-color .22s ease, transform .22s ease;
}

.post-nav__link:hover {
  background: color-mix(in srgb, var(--accent) 12%, var(--panel-2));
  transform: translateY(-2px);
}

.post-nav__label {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

.post-nav__title {
  font-size: .98rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

.post-nav__link--next {
  text-align: right;
}

/* --------------------------------------------------------------------------
   10. 窄屏与动效降级
   -------------------------------------------------------------------------- */

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

  .article-hero {
    padding-inline: 1.5rem;
  }

  .breadcrumb__list [aria-current="page"] {
    max-width: 100%;
    white-space: normal;
  }

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

  .post-nav__link--next {
    text-align: left;
  }
}

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

  .post-card:hover,
  .related-card:hover,
  .post-nav__link:hover {
    transform: none;
  }
}