/* ==========================================================================
   VPNBQ · 博客样式包
   仅由 zh-CN/blog/index.html 与 zh-CN/blog/articles/*.html 引用
   全部颜色 / 圆角 / 字体取自 base.css 的 :root 设计令牌
   ========================================================================== */

:root {
  --reading-col: 47.5rem; /* 760px,与 base.css 的 .prose 上限一致,保证面包屑 / hero / 正文同一条列 */
  --reading-pad: clamp(1.5rem, 4vw, 2.5rem);
  --band-tint: color-mix(in srgb, var(--accent) 7%, var(--bg));
}

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

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

/* --------------------------------------------------------------------------
   2. 通栏色带(full-bleed-band)
   -------------------------------------------------------------------------- */

.band {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(120% 150% at 10% -20%, color-mix(in srgb, var(--accent) 9%, transparent), transparent 62%),
    linear-gradient(180deg, var(--bg-top), var(--band-tint));
}

.band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(color-mix(in srgb, var(--accent) 18%, transparent) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: .42;
  pointer-events: none;
}

.band > * {
  position: relative;
  z-index: 1;
}

.band .wrap {
  padding-inline: max(var(--gutter), 1.5rem);
}

/* --------------------------------------------------------------------------
   3. 列表页 hero
   -------------------------------------------------------------------------- */

.blog-hero {
  padding-block: clamp(2.6rem, 6vw, 4.2rem) clamp(2rem, 4.5vw, 3rem);
}

.band-kicker {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .34rem .8rem;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  background-image: linear-gradient(var(--bg-panel), var(--bg-panel)), var(--rainbow);
  background-origin: border-box;
  background-clip: padding-box, border-box;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--text-2);
}

.blog-hero h1 {
  margin: .95rem 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  text-wrap: pretty;
  color: var(--text);
}

.blog-hero h1 .no-break {
  color: var(--accent);
}

.band-lede {
  max-width: 44rem;
  margin: .95rem 0 0;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-2);
}

.band-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  margin: 1.15rem 0 0;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .02em;
  color: var(--text-3);
}

.band-meta .sep {
  color: var(--border-strong);
}

/* --------------------------------------------------------------------------
   4. 列表页:筛选条与文章卡
   -------------------------------------------------------------------------- */

.blog-list-sec {
  padding-block: clamp(2.2rem, 4.6vw, 3.4rem) clamp(3rem, 6vw, 4.6rem);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.1rem;
}

.filter-btn {
  font-family: var(--font-body);
  font-size: .88rem;
  line-height: 1.5;
  padding: .42rem .98rem;
  color: var(--text-2);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.filter-btn:hover {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 34%, var(--border));
}

.filter-btn:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 2px;
}

.filter-btn.is-on {
  color: var(--on-accent);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
}

.list-count {
  margin: 0 0 1.5rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--text-3);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr));
  gap: 1.25rem;
}

.post-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .62rem;
  padding: 1.45rem 1.4rem 1.25rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-soft);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.post-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 1.4rem;
  right: 1.4rem;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: opacity .2s ease;
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 24%, var(--border));
  box-shadow: var(--shadow-panel);
}

.post-card:hover::before {
  opacity: 1;
}

.post-card.reveal,
.post-card.reveal.shown {
  opacity: 1;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .02em;
  color: var(--text-3);
}

.post-meta .sep {
  color: var(--border-strong);
}

.post-meta .post-tag {
  color: var(--accent);
}

.post-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.22rem;
  line-height: 1.42;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

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

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

.post-card p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--text-2);
}

.post-more {
  margin-top: auto;
  padding-top: .35rem;
  font-size: .86rem;
  color: var(--accent);
  text-decoration: none;
}

.post-more:hover {
  text-decoration: underline;
}

.post-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 1.6rem 1.4rem;
  background: var(--bg-panel-2);
  border: 1px dashed var(--border-strong);
  border-radius: var(--r-md);
  color: var(--text-2);
  font-size: .94rem;
}

/* --------------------------------------------------------------------------
   5. 文章页面包屑
   -------------------------------------------------------------------------- */

.breadcrumb {
  margin-top: 1.4rem;
  margin-bottom: 1.4rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--text-3);
}

.breadcrumb a {
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover {
  color: var(--accent);
  border-bottom-color: color-mix(in srgb, var(--accent) 42%, transparent);
}

.breadcrumb .crumb-sep {
  color: var(--border-strong);
}

.breadcrumb [aria-current="page"] {
  color: var(--text-3);
}

/* --------------------------------------------------------------------------
   6. 文章 hero(通栏色带,meta 无框小字 + 中点)
   -------------------------------------------------------------------------- */

.article-hero {
  padding-block: clamp(1.7rem, 3.8vw, 2.4rem) clamp(1.7rem, 3.8vw, 2.4rem);
}

.article-hero .meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .02em;
  color: var(--text-3);
}

.article-hero .meta-row .sep {
  color: var(--border-strong);
}

.article-hero .meta-row .meta-tag {
  color: var(--accent);
}

.article-hero h1 {
  margin: .85rem 0 .7rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  line-height: 1.24;
  letter-spacing: -0.02em;
  text-wrap: pretty;
  color: var(--text);
}

.article-hero .lede {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-2);
}

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

.reading-wrap > .prose {
  margin-top: clamp(1rem, 2vw, 1.5rem);
  margin-inline: auto;
}

.prose {
  counter-reset: h2c;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
}

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

.prose p {
  margin: 0 0 1.15rem;
}

.prose h2 {
  counter-increment: h2c;
  margin: 2.6rem 0 1rem;
  padding-bottom: .55rem;
  border-bottom: 1px solid var(--border-soft);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.6rem;
  line-height: 1.36;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  color: var(--text);
}

.prose h2::before {
  content: counter(h2c, decimal-leading-zero);
  display: inline-block;
  margin-right: .6rem;
  padding: .1rem .42rem;
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: var(--r-sm);
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-panel));
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--accent);
  vertical-align: middle;
}

.prose h3 {
  margin: 1.9rem 0 .7rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.3rem;
  line-height: 1.42;
  letter-spacing: -0.005em;
  text-wrap: pretty;
  color: var(--text);
}

.prose ul,
.prose ol {
  margin: 0 0 1.15rem;
  padding-left: 1.35rem;
}

.prose li {
  margin-bottom: .45rem;
}

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

.prose a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 38%, transparent);
}

.prose a:hover {
  border-bottom-color: var(--accent);
}

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

.prose hr {
  margin: 2.4rem 0;
  border: 0;
  border-top: 1px solid var(--border);
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: .95rem 1.2rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: color-mix(in srgb, var(--accent) 5%, var(--bg-panel));
  color: var(--text-2);
}

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

.prose code {
  padding: .1rem .35rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-panel-2);
  font-family: var(--font-mono);
  font-size: .88em;
}

.prose pre {
  position: relative;
  margin: 1.5rem 0;
  padding: 2.5rem 1.2rem 1.15rem;
  border: 1px solid var(--graphite-lo);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, var(--graphite-hi), var(--graphite-body));
  box-shadow: var(--shadow-soft);
  overflow-x: auto;
}

.prose pre::before {
  content: "";
  position: absolute;
  top: .9rem;
  left: 1.1rem;
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: var(--error);
  box-shadow: 1.05rem 0 0 var(--warn), 2.1rem 0 0 var(--success);
}

.prose pre code {
  padding: 0;
  border: 0;
  background: none;
  color: var(--bg-panel);
  font-size: .84rem;
  line-height: 1.72;
}

.prose table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  font-size: .92rem;
}

.prose thead th {
  padding: .72rem .85rem;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}

.prose tbody td {
  padding: .68rem .85rem;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text-2);
}

.prose tbody tr:nth-child(even) {
  background: var(--bg-panel-3);
}

.prose tbody tr:hover {
  background: color-mix(in srgb, var(--accent) 7%, var(--bg-panel));
}

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

/* --------------------------------------------------------------------------
   8. 正文富文本组件:数据卡 / 勾叉清单 / 结论块 / callout
   -------------------------------------------------------------------------- */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: .9rem;
  margin: 1.6rem 0;
}

.stat-card {
  position: relative;
  padding: 1.1rem 1.05rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.stat-card:nth-child(even) {
  background: color-mix(in srgb, var(--accent) 5%, var(--bg-panel));
}

.stat-card:nth-child(even)::before {
  background: linear-gradient(90deg, var(--accent-2), color-mix(in srgb, var(--accent-2) 40%, var(--bg-panel)));
}

.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--accent);
}

.stat-card:nth-child(3n) .stat-num {
  color: var(--accent-dark);
}

.stat-label {
  display: block;
  margin-top: .32rem;
  font-size: .82rem;
  line-height: 1.62;
  color: var(--text-2);
}

.check-list {
  display: grid;
  gap: .55rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  margin: 0;
  padding: .8rem 1rem;
  border: 1px solid var(--border);
  border-left: 3px solid color-mix(in srgb, var(--accent) 32%, var(--border));
  border-radius: var(--r-md);
  background: var(--bg-panel);
  color: var(--text-2);
  line-height: 1.75;
  transition: border-color .18s ease, background-color .18s ease;
}

.check-list li:hover {
  border-color: color-mix(in srgb, var(--accent) 24%, var(--border));
  border-left-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 4%, var(--bg-panel));
}

.verdict {
  margin: 1.6rem 0;
  padding: 1.05rem 1.2rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: var(--bg-panel);
  box-shadow: var(--shadow-soft);
  color: var(--text-2);
  line-height: 1.82;
}

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

.callout {
  position: relative;
  margin: 1.5rem 0;
  padding: 1.05rem 1.2rem 1.05rem 3.1rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: color-mix(in srgb, var(--accent) 6%, var(--bg-panel));
  color: var(--text-2);
  line-height: 1.8;
}

.callout::before {
  content: "";
  position: absolute;
  top: 1.05rem;
  left: 1rem;
  width: 1.2rem;
  height: 1.2rem;
  border-radius: var(--r-sm);
  background: var(--accent);
}

.callout::after {
  content: "";
  position: absolute;
  top: 1.72rem;
  left: 1.53rem;
  width: .14rem;
  height: .42rem;
  border-radius: 1px;
  background: var(--on-accent);
  box-shadow: 0 -.32rem 0 var(--on-accent);
}

.callout p {
  margin: 0;
}

.callout strong {
  color: var(--text);
}

.callout-warn {
  border-left-color: var(--warn);
  background: color-mix(in srgb, var(--warn) 9%, var(--bg-panel));
}

.callout-warn::before {
  background: var(--warn);
}

.callout-success {
  border-left-color: var(--success);
  background: color-mix(in srgb, var(--success) 8%, var(--bg-panel));
}

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

/* --------------------------------------------------------------------------
   9. 文末推广卡
   -------------------------------------------------------------------------- */

.promo-block {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.1rem;
  margin-top: 2.6rem;
  padding: 1.6rem 1.5rem;
  border: 1px solid color-mix(in srgb, var(--accent) 32%, var(--border));
  border-radius: var(--r-lg);
  background:
    radial-gradient(140% 130% at 88% 10%, color-mix(in srgb, var(--accent-2) 26%, transparent), transparent 62%),
    linear-gradient(135deg, var(--accent-dark), var(--accent) 55%, var(--accent-2));
  color: var(--on-accent);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.promo-block .promo-copy {
  flex: 1 1 18rem;
}

.promo-block .promo-brand {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  color: color-mix(in srgb, var(--on-accent) 82%, transparent);
}

.promo-block p {
  margin: 0;
  line-height: 1.78;
  color: var(--on-accent);
}

.promo-block .btn-primary {
  background: var(--bg-panel);
  color: var(--accent);
  border-color: var(--bg-panel);
  box-shadow: none;
}

.promo-block .btn-primary:hover {
  background: var(--bg-panel-2);
  color: var(--accent-dark);
}

.promo-block .btn-ghost {
  background: transparent;
  color: var(--on-accent);
  border-color: color-mix(in srgb, var(--on-accent) 55%, transparent);
}

.promo-block .btn-ghost:hover {
  border-color: var(--on-accent);
}

/* --------------------------------------------------------------------------
   10. 延伸阅读 / 上一篇下一篇
   -------------------------------------------------------------------------- */

#related-posts {
  padding-top: 2.2rem;
}

#post-nav {
  padding-bottom: 2.2rem;
}

#related-posts h2,
#post-nav .nav-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.3rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  color: var(--text);
}

.related-grid,
.post-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: .9rem;
}

.related-card,
.pn-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.05rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  box-shadow: var(--shadow-soft);
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.related-card::before,
.pn-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 1.1rem;
  right: 1.1rem;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: opacity .2s ease;
}

.related-card:hover,
.pn-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 26%, var(--border));
  box-shadow: var(--shadow-panel);
}

.related-card:hover::before,
.pn-card:hover::before {
  opacity: 1;
}

.rc-meta,
.pn-dir {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .05em;
  color: var(--text-3);
}

.pn-dir {
  color: var(--accent);
  letter-spacing: .1em;
}

.rc-title,
.pn-title {
  font-size: .98rem;
  line-height: 1.58;
  color: var(--text);
}

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

@media (max-width: 768px) {
  .blog-hero h1 {
    font-size: clamp(1.7rem, 7.4vw, 2.1rem);
  }

  .article-hero h1 {
    font-size: clamp(1.5rem, 6.6vw, 1.9rem);
  }

  .prose h2 {
    font-size: 1.42rem;
  }

  .prose h3 {
    font-size: 1.18rem;
  }

  .promo-block {
    padding: 1.35rem 1.2rem;
  }
}

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

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

  .post-card {
    padding: 1.25rem 1.15rem 1.1rem;
  }

  .post-card::before {
    left: 1.15rem;
    right: 1.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .post-card,
  .related-card,
  .pn-card,
  .check-list li,
  .filter-btn {
    transition: none;
  }

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