/* ==========================================================================
   VPNCZ · 博客样式包（列表页 + 文章页）
   所有颜色 / 圆角 / 字体取自 base.css 的 :root 设计令牌，不写死色值。
   阅读列：52~57rem（本站取 55rem），面包屑 / hero / 正文 / 文末推广共用同一条列。
   ========================================================================== */

:root {
  --blog-read: 55rem;
  --blog-gutter: 1.5rem;
}

/* --------------------------------------------------------------------------
   1. 阅读列（显式覆盖 base.css 的 --content-reading，保证与 hero 左缘对齐）
   -------------------------------------------------------------------------- */

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

/* --------------------------------------------------------------------------
   2. 通栏色带 Hero（列表页与文章页共用，本站抽中版式 full-bleed-band）
      色带横向铺满视口，上下各一条细线收边；文字仍在阅读列内。
   -------------------------------------------------------------------------- */

.band-hero {
  position: relative;
  margin-inline: calc(50% - 50vw);
  padding-inline: max(var(--blog-gutter), calc((100vw - var(--blog-read)) / 2));
  padding-block: clamp(2.25rem, 5vw, 3.5rem);
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  isolation: isolate;
}

.band-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(var(--ink-rgb), 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(var(--ink-rgb), 0.05) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.55;
  pointer-events: none;
}

.band-hero::after {
  content: "";
  position: absolute;
  top: -45%;
  right: -8%;
  width: 44%;
  height: 190%;
  z-index: 0;
  background: linear-gradient(120deg, transparent 0%, rgba(var(--apricot-rgb), 0.2) 50%, transparent 100%);
  transform: rotate(8deg);
  pointer-events: none;
}

.band-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--blog-read);
  margin-inline: auto;
}

/* --------------------------------------------------------------------------
   3. 列表页 Hero
   -------------------------------------------------------------------------- */

.blog-hero h1 {
  margin: 0.65rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--ink);
  text-wrap: pretty;
}

.blog-hero-sub {
  max-width: 44rem;
  margin: 1rem 0 0;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--muted);
}

.blog-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--muted);
}

.blog-hero-meta .dotsep {
  color: var(--border);
}

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

.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  appearance: none;
  padding: 0.6rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1;
  cursor: pointer;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.filter-btn:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.filter-btn.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--panel);
}

.filter-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   5. 文章卡片列表
   -------------------------------------------------------------------------- */

.post-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.post-card {
  position: relative;
  display: block;
  padding: 1.5rem 1.5rem 1.35rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: inherit;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.post-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 1.5rem;
  width: 0;
  height: 3px;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  transition: width 0.25s ease;
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--sh-card);
}

.post-card:hover::before {
  width: 4.5rem;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

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

.post-card h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.12rem, 2.1vw, 1.35rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: pretty;
}

.post-card p {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--muted);
}

.post-card .link-arrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.post-empty {
  margin: 0;
  padding: 2.5rem 1.5rem;
  border-radius: var(--r-md);
  background: var(--panel-2);
  color: var(--muted);
  font-size: 0.95rem;
  text-align: center;
}

/* --------------------------------------------------------------------------
   6. 文章页面包屑（与页头留呼吸空间）
   -------------------------------------------------------------------------- */

.breadcrumb {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
  margin-bottom: 1.25rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.45rem;
  color: var(--border);
}

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

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

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

/* --------------------------------------------------------------------------
   7. 文章 Hero（通栏色带：无卡片无边框，meta 为无框小字 + 中点分隔）
   -------------------------------------------------------------------------- */

.article-hero h1 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--ink);
  text-wrap: pretty;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted);
}

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

.article-lede {
  max-width: 46rem;
  margin: 1.1rem 0 0;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   8. 正文排版
   -------------------------------------------------------------------------- */

.article-body {
  counter-reset: sec;
  padding-block: clamp(1.75rem, 3.5vw, 2.5rem) 0;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--ink);
}

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

.article-body > * + * {
  margin-top: 1.15rem;
}

.article-body p {
  margin: 0;
}

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

.article-body li + li {
  margin-top: 0.5rem;
}

.article-body strong {
  font-weight: 700;
  color: var(--ink);
}

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

.article-body h2 {
  counter-increment: sec;
  margin: 2.75rem 0 0;
  padding-top: 1.15rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 2.4vw, 1.6rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: pretty;
}

.article-body h2::before {
  content: "0" counter(sec);
  display: inline-block;
  margin-right: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.78em;
  font-weight: 700;
  color: var(--accent);
  transform: translateY(-0.08em);
}

.article-body h3 {
  margin: 2rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.08rem, 1.8vw, 1.3rem);
  line-height: 1.45;
  color: var(--ink);
  text-wrap: pretty;
}

.article-body h3::before {
  content: "";
  display: inline-block;
  width: 0.55rem;
  height: 2px;
  margin-right: 0.5rem;
  background: var(--accent);
  vertical-align: middle;
}

.article-body blockquote {
  margin: 1.5rem 0 0;
  padding: 1rem 1.25rem;
  background: var(--panel-2);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  color: var(--muted);
  font-size: 0.98rem;
}

/* 表格：实色表头 + 斑马纹 + hover 行 */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  overflow: hidden;
  background: var(--panel);
  font-size: 0.92rem;
}

.article-body thead th {
  padding: 0.8rem 0.9rem;
  background: var(--ink);
  color: var(--panel);
  font-family: var(--font-display);
  font-weight: 700;
  text-align: left;
  white-space: nowrap;
}

.article-body td {
  padding: 0.75rem 0.9rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

.article-body tbody tr:nth-child(even) {
  background: color-mix(in srgb, var(--panel-2) 45%, var(--panel));
}

.article-body tbody tr:hover {
  background: color-mix(in srgb, var(--accent) 8%, var(--panel));
}

/* 窄屏横滑，严禁表格把版心撑宽 */
@media (max-width: 860px) {
  .article-body table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
  }
}

/* 代码：终端窗 */
.article-body pre {
  position: relative;
  margin: 1.5rem 0 0;
  padding: 2.4rem 1.15rem 1.15rem;
  border-radius: var(--r-md);
  background: var(--ink);
  color: color-mix(in srgb, var(--panel) 88%, var(--bg));
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.75;
  overflow-x: auto;
}

.article-body pre::before {
  content: "";
  position: absolute;
  top: 0.85rem;
  left: 1.15rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--err);
  box-shadow: 16px 0 0 var(--warn), 32px 0 0 var(--ok);
}

.article-body pre code {
  padding: 0;
  background: none;
  color: inherit;
  font-size: inherit;
}

.article-body code {
  padding: 0.15em 0.4em;
  border-radius: 4px;
  background: var(--panel-2);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.875em;
  overflow-wrap: anywhere;
}

/* --------------------------------------------------------------------------
   9. Callout
   -------------------------------------------------------------------------- */

.callout {
  position: relative;
  margin: 1.5rem 0 0;
  padding: 1rem 1.15rem 1rem 3rem;
  background: color-mix(in srgb, var(--accent) 7%, var(--panel));
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  color: var(--ink);
  font-size: 0.96rem;
  line-height: 1.85;
}

.callout::before {
  content: "i";
  position: absolute;
  top: 1rem;
  left: 0.95rem;
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--panel);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.15rem;
  text-align: center;
}

.callout-title {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 700;
}

.callout p {
  margin: 0;
}

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

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

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

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

/* --------------------------------------------------------------------------
   10. 数据卡网格（至少两档颜色变化）
   -------------------------------------------------------------------------- */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.9rem;
  margin: 1.5rem 0 0;
}

.stat-card {
  padding: 1.1rem 1.05rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--r-md);
  background: var(--panel);
}

.stat-card:nth-child(2) {
  border-top-color: var(--accent-soft);
  background: color-mix(in srgb, var(--accent) 6%, var(--panel));
}

.stat-card:nth-child(3) {
  border-top-color: var(--ink);
  background: var(--panel-2);
}

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  line-height: 1.1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   11. 勾叉清单（只做容器/行卡装饰，不注入任何勾叉语义标记）
   -------------------------------------------------------------------------- */

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

.check-list li,
.check-list li + li {
  margin-top: 0;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--panel);
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.75;
}

.check-list li:nth-child(even) {
  background: color-mix(in srgb, var(--panel-2) 40%, var(--panel));
}

/* --------------------------------------------------------------------------
   12. 结论块
   -------------------------------------------------------------------------- */

.verdict {
  margin: 1.5rem 0 0;
  padding: 1rem 1.15rem;
  background: color-mix(in srgb, var(--accent) 8%, var(--panel));
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  color: var(--ink);
  font-size: 0.98rem;
  line-height: 1.85;
}

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

/* --------------------------------------------------------------------------
   13. 文末推广卡（全站唯一，彩底重配色按钮）
   -------------------------------------------------------------------------- */

.article-promo {
  position: relative;
  margin-top: clamp(2.5rem, 5vw, 3.25rem);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, var(--ink) 0%, color-mix(in srgb, var(--ink) 74%, var(--accent)) 100%);
  color: var(--panel);
  overflow: hidden;
}

.article-promo::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -12%;
  width: 52%;
  height: 220%;
  background: linear-gradient(120deg, transparent 0%, rgba(var(--apricot-rgb), 0.28) 50%, transparent 100%);
  transform: rotate(10deg);
  pointer-events: none;
}

.article-promo-copy {
  position: relative;
  z-index: 1;
}

.article-promo-copy b {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.article-promo-copy p {
  margin: 0.6rem 0 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: color-mix(in srgb, var(--panel) 84%, var(--bg));
}

.article-promo-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.article-promo .btn-primary {
  background: var(--panel);
  border-color: var(--panel);
  color: var(--ink);
}

.article-promo .btn-primary:hover {
  background: var(--bg-top);
  border-color: var(--bg-top);
  color: var(--ink);
}

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

.article-promo .btn-ghost:hover {
  background: rgba(var(--white-rgb), 0.12);
  border-color: var(--panel);
  color: var(--panel);
}

/* --------------------------------------------------------------------------
   14. 延伸阅读
   -------------------------------------------------------------------------- */

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

#related-posts {
  margin-top: clamp(2.5rem, 5vw, 3rem);
}

.related-title {
  margin: 0 0 1rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.15rem;
  color: var(--ink);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.9rem;
}

.related-card {
  position: relative;
  display: block;
  padding: 1.1rem 1.1rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  border-radius: var(--r-sm) var(--r-sm) 0 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  transition: width 0.25s ease;
}

.related-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--sh-soft);
}

.related-card:hover::before {
  width: 100%;
}

.related-card .post-meta {
  margin-bottom: 0.6rem;
  font-size: 0.72rem;
}

.related-card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--ink);
  text-wrap: pretty;
}

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

/* --------------------------------------------------------------------------
   15. 上一篇 / 下一篇（与延伸阅读的垫距相加 ≤5rem）
   -------------------------------------------------------------------------- */

#post-nav {
  margin-top: clamp(1.5rem, 3vw, 2rem);
  padding-bottom: clamp(2rem, 4vw, 2.5rem);
}

.post-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 0.9rem;
}

.post-nav-card {
  position: relative;
  display: block;
  padding: 1.05rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.post-nav-card::after {
  content: "";
  position: absolute;
  right: 1.1rem;
  bottom: 0;
  left: 1.1rem;
  height: 2px;
  border-radius: var(--r-sm) var(--r-sm) 0 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s ease;
}

.post-nav-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--sh-soft);
}

.post-nav-card:hover::after {
  transform: scaleX(1);
}

.post-nav-card .nav-dir {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.post-nav-card b {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--ink);
  text-wrap: pretty;
}

.post-nav-card.is-next {
  text-align: right;
}

.post-nav-card.is-next::after {
  transform-origin: right center;
}

/* --------------------------------------------------------------------------
   16. 响应式
   -------------------------------------------------------------------------- */

@media (max-width: 640px) {
  :root {
    --blog-gutter: 1.125rem;
  }

  .band-hero {
    padding-block: 2rem;
  }

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

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

  .article-body h2 {
    margin-top: 2.25rem;
  }

  .article-promo-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .post-nav-card.is-next {
    text-align: left;
  }
}

/* --------------------------------------------------------------------------
   17. 动效降级
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .filter-btn,
  .post-card,
  .post-card::before,
  .related-card,
  .related-card::before,
  .post-nav-card,
  .post-nav-card::after {
    transition: none;
  }

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