/* ==========================================================================
   VPNVL · 博客样式包(列表页 + 文章页 + 文末注册引导弹窗)
   所有颜色、圆角、阴影一律取自 base.css 的设计令牌,不新增色值。
   ========================================================================== */

:root {
  --blog-col: 54rem;
}

/* --------------------------------------------------------------------------
   1. 列表页 Hero
   -------------------------------------------------------------------------- */

.blog-hero {
  position: relative;
  overflow-x: clip;
  padding-block: clamp(2.2rem, 5vw, 3.6rem) clamp(1.2rem, 2.6vw, 1.8rem);
  background: var(--panel-soft);
  border-bottom: 1px solid var(--border-soft);
}

.blog-hero-in {
  max-width: 52rem;
  text-align: center;
}

.blog-hero h1 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  line-height: 1.18;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  text-wrap: pretty;
}

.blog-lede {
  max-width: 40rem;
  margin: 0.9rem auto 0;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--text-2);
}

/* --------------------------------------------------------------------------
   2. 标签筛选
   -------------------------------------------------------------------------- */

.blog-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.4rem;
}

.filter-btn {
  appearance: none;
  -webkit-appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0.55rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--panel-3);
  color: var(--text-2);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease, box-shadow .18s ease;
}

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

.filter-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-dark);
  box-shadow: var(--shadow-chip);
}

.filter-btn.is-active:hover {
  color: var(--on-dark);
}

/* --------------------------------------------------------------------------
   3. 列表页栏目标题与计数
   -------------------------------------------------------------------------- */

.blog-list-title {
  margin: 0 0 0.5rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.blog-count {
  margin: 0 0 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   4. 列表卡片
   -------------------------------------------------------------------------- */

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr));
  gap: 1.1rem;
}

.post-card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: clamp(1.2rem, 2.4vw, 1.6rem);
  background: var(--panel-3);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-card);
  color: inherit;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.post-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad-keyword);
  opacity: 0;
  transition: opacity .2s ease;
}

.post-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow-window);
}

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

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.78rem;
}

.post-tag {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  padding: 0.24rem 0.62rem;
  border-radius: var(--r-pill);
  background: color-mix(in srgb, var(--accent) 12%, var(--panel-3));
  color: var(--accent-dark);
  font-size: 0.76rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.post-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.post-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1.52;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  text-wrap: pretty;
}

.post-excerpt {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-more {
  margin-top: auto;
  padding-top: 0.3rem;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--accent-dark);
}

.blog-empty {
  margin: 2rem 0 0;
  padding: 2rem 1.5rem;
  border: 1px dashed var(--border);
  border-radius: var(--r-lg);
  background: var(--panel);
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.8;
  text-align: center;
}

/* --------------------------------------------------------------------------
   5. 文章页:阅读列(面包屑 / hero / 正文 / 推广 / 关联,共用同一条列)
   -------------------------------------------------------------------------- */

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

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

.breadcrumb {
  padding-top: 1.6rem;
  margin-bottom: 1.2rem;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--muted);
}

.breadcrumb-list a {
  color: var(--muted);
  text-decoration: none;
  transition: color .16s ease;
}

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

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

.breadcrumb-list [aria-current="page"] {
  color: var(--text-2);
}

/* --------------------------------------------------------------------------
   7. 文章 Hero —— split-meta:左 3/4 标题摘要,右 1/4 竖向 meta 卡
   -------------------------------------------------------------------------- */

.article-hero {
  position: relative;
  padding-top: 2rem;
  margin-bottom: clamp(1.6rem, 3vw, 2.2rem);
  border-top: 1px solid var(--border);
}

.article-hero::before {
  content: "";
  position: absolute;
  top: 0.62rem;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 13px 0 0 var(--mint), 26px 0 0 var(--success);
}

.article-hero::after {
  content: "";
  position: absolute;
  top: 0.82rem;
  right: 0;
  width: 3.5rem;
  height: 2px;
  border-radius: var(--r-pill);
  background: var(--grad-keyword);
}

.article-hero-in {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

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

.article-title {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.2vw, 2.6rem);
  line-height: 1.26;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  text-wrap: pretty;
}

.article-lede {
  margin: 0;
  max-width: 42rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-2);
}

.article-meta-card {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--panel-2);
}

.article-meta-card .post-tag {
  align-self: flex-start;
  background: var(--accent);
  color: var(--on-dark);
}

.meta-row {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--border);
}

.meta-k {
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--muted);
}

.meta-v {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-2);
  overflow-wrap: anywhere;
}

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

.article-body {
  counter-reset: article-section;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-2);
  overflow-wrap: break-word;
}

.article-body p {
  margin: 0 0 1.1rem;
}

.article-body strong {
  color: var(--text);
  font-weight: 600;
}

.article-body em {
  font-style: normal;
  color: var(--accent-dark);
}

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

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

.article-body h2 {
  counter-increment: article-section;
  margin: 2.4rem 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.28rem, 2.2vw, 1.6rem);
  line-height: 1.42;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  text-wrap: pretty;
}

.article-body h2::before {
  content: counter(article-section, decimal-leading-zero);
  display: inline-block;
  margin-right: 0.55em;
  font-family: var(--font-mono);
  font-size: 0.64em;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--accent);
  vertical-align: 0.14em;
}

.article-body h3 {
  margin: 1.9rem 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.06rem, 1.6vw, 1.3rem);
  line-height: 1.52;
  font-weight: 600;
  color: var(--text);
  text-wrap: pretty;
}

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

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

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

.article-body blockquote {
  margin: 1.6rem 0;
  padding: 1rem 1.2rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: var(--panel-2);
  color: var(--text-2);
}

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

.article-body hr {
  margin: 2.2rem 0;
  border: 0;
  border-top: 1px dashed var(--border);
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
}

/* 行内代码 */
.article-body code {
  padding: 0.12em 0.42em;
  border-radius: var(--r-sm);
  background: var(--panel-2);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.87em;
  overflow-wrap: anywhere;
}

/* 终端窗式代码块 */
.article-body pre {
  position: relative;
  margin: 1.6rem 0;
  padding: 2.2rem 1.2rem 1.1rem;
  border-radius: var(--r-md);
  background: var(--text);
  color: var(--panel-3);
  box-shadow: var(--shadow-card);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  overflow-x: auto;
}

.article-body pre::before {
  content: "";
  position: absolute;
  top: 0.95rem;
  left: 1.15rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--error);
  box-shadow: 13px 0 0 var(--warn), 26px 0 0 var(--success);
}

.article-body pre code {
  padding: 0;
  border-radius: 0;
  background: none;
  color: inherit;
  font-size: 0.98em;
  overflow-wrap: normal;
}

/* 表格:实色表头 + 斑马纹 + hover,窄屏可横滑 */
.article-body .table-scroll {
  margin: 1.6rem 0;
}

.article-body .table-scroll table {
  min-width: 34rem;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel-3);
  font-size: 0.9rem;
  line-height: 1.7;
}

.article-body thead th {
  padding: 0.7rem 0.85rem;
  background: var(--accent-dark);
  color: var(--on-dark);
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}

.article-body tbody th,
.article-body tbody td {
  padding: 0.65rem 0.85rem;
  border-top: 1px solid var(--border-soft);
  color: var(--text-2);
  text-align: left;
  word-break: keep-all;
}

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

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

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

/* --------------------------------------------------------------------------
   9. 正文视觉锚点:数据卡 / 勾叉清单 / 结论块 / callout
   -------------------------------------------------------------------------- */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  gap: 0.85rem;
  margin: 1.6rem 0;
}

.stat-card {
  position: relative;
  overflow: hidden;
  padding: 1.1rem 1.1rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--panel-3);
  box-shadow: var(--shadow-chip);
}

.stat-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--accent);
}

.stat-card:nth-child(2)::before {
  background: var(--mint);
}

.stat-card:nth-child(3)::before {
  background: var(--forest);
}

.stat-card:nth-child(4)::before {
  background: var(--accent-3);
}

.stat-num {
  display: block;
  margin: 0 0 0.25rem;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text);
}

.stat-label {
  display: block;
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--muted);
}

.check-list {
  display: grid;
  gap: 0.55rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  margin: 0;
  padding: 0.72rem 0.95rem;
  border: 1px solid var(--border-soft);
  border-radius: var(--r-md);
  background: var(--panel);
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--text-2);
}

.verdict {
  margin: 1.6rem 0;
  padding: 1rem 1.1rem 1rem 1.25rem;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: color-mix(in srgb, var(--accent) 7%, var(--panel-3));
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--text-2);
}

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

.article-body .callout {
  position: relative;
  margin: 1.6rem 0;
  padding: 1rem 1.1rem 1rem 2.75rem;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: color-mix(in srgb, var(--accent) 8%, var(--panel-3));
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-2);
}

.article-body .callout::before {
  content: "i";
  position: absolute;
  top: 1.05rem;
  left: 0.9rem;
  display: grid;
  place-items: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--on-dark);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1;
}

.article-body .callout p {
  margin: 0;
}

.article-body .callout-mint {
  border-left-color: var(--success);
  background: color-mix(in srgb, var(--success) 9%, var(--panel-3));
}

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

.article-body .callout-warn {
  border-left-color: var(--warn);
  background: color-mix(in srgb, var(--warn) 10%, var(--panel-3));
}

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

/* --------------------------------------------------------------------------
   10. 文末推广卡(品牌渐变 + 彩底按钮重配色)
   -------------------------------------------------------------------------- */

.promo-block {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: clamp(1.4rem, 3vw, 2rem);
  border: 1px solid var(--accent-dark);
  border-radius: var(--r-xl);
  background: linear-gradient(135deg, var(--accent-dark) 0%, var(--accent) 62%, var(--accent-2) 100%);
  box-shadow: var(--shadow-panel);
  color: var(--on-dark);
}

.promo-copy {
  flex: 1 1 20rem;
  min-width: 0;
}

.promo-brand {
  margin: 0 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: color-mix(in srgb, var(--on-dark) 80%, transparent);
}

.promo-block h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  line-height: 1.42;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--on-dark);
  text-wrap: pretty;
}

.promo-block p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: color-mix(in srgb, var(--on-dark) 88%, transparent);
}

.promo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  flex-shrink: 0;
}

.promo-block .btn-primary {
  background: var(--panel-3);
  border-color: var(--panel-3);
  color: var(--accent-dark);
  box-shadow: var(--shadow-btn-ghost);
}

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

.promo-block .btn-ghost {
  background: transparent;
  border-color: color-mix(in srgb, var(--on-dark) 58%, transparent);
  color: var(--on-dark);
}

.promo-block .btn-ghost:hover {
  background: color-mix(in srgb, var(--on-dark) 14%, transparent);
  color: var(--on-dark);
}

/* --------------------------------------------------------------------------
   11. 上一篇 / 下一篇 与 延伸阅读(垫距合计 ≤5rem,不叠空洞)
   -------------------------------------------------------------------------- */

#post-nav {
  margin-top: 2.4rem;
}

.post-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.post-nav-link {
  flex: 1 1 15rem;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.9rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  transition: border-color .2s ease, background-color .2s ease, transform .2s ease;
}

.post-nav-link:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: var(--panel-3);
}

.post-nav-dir {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.post-nav-title {
  font-size: 0.94rem;
  line-height: 1.58;
  font-weight: 600;
  color: var(--text);
  text-wrap: pretty;
}

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

#related-posts {
  margin-top: 2.4rem;
  padding-bottom: 1rem;
}

.related-heading {
  position: relative;
  margin: 0 0 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}

.related-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 3rem;
  height: 2px;
  border-radius: var(--r-pill);
  background: var(--accent);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  gap: 0.85rem;
}

.related-card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--panel-3);
  color: inherit;
  text-decoration: none;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.related-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--accent);
  opacity: 0;
  transition: opacity .2s ease;
}

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

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

.related-card-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.98rem;
  line-height: 1.56;
  font-weight: 600;
  color: var(--text);
  text-wrap: pretty;
}

.related-card-excerpt {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.72;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* --------------------------------------------------------------------------
   12. 文末注册引导弹窗
   -------------------------------------------------------------------------- */

body.has-modal {
  overflow: hidden;
}

.signup-modal {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  padding: var(--gutter);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .24s ease, visibility .24s ease;
}

.signup-modal.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.signup-backdrop {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--text) 58%, transparent);
}

.signup-panel {
  position: relative;
  z-index: 1;
  width: min(26rem, 100%);
  padding: 1.6rem 1.5rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  background: var(--panel-3);
  box-shadow: var(--shadow-window);
  transform: translateY(12px) scale(.985);
  transition: transform .24s ease;
}

.signup-modal.is-open .signup-panel {
  transform: translateY(0) scale(1);
}

.signup-close {
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--panel);
  color: var(--text-2);
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}

.signup-close:hover {
  background: var(--panel-2);
  border-color: var(--accent);
  color: var(--text);
}

.signup-brand {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--accent-dark);
}

.signup-title {
  margin: 0 0 0.5rem;
  padding-right: 1.6rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.45;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  text-wrap: pretty;
}

.signup-text {
  margin: 0 0 1.1rem;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}

.signup-actions {
  display: grid;
  gap: 0.55rem;
}

.signup-note {
  margin: 0.9rem 0 0;
  font-size: 0.75rem;
  line-height: 1.65;
  color: var(--muted);
  text-align: center;
}

/* --------------------------------------------------------------------------
   13. 响应式
   -------------------------------------------------------------------------- */

@media (max-width: 860px) {
  .article-hero-in {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.1rem;
  }

  .article-meta-card {
    order: -1;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem 1rem;
    padding: 0.8rem 0.95rem;
  }

  .meta-row {
    flex-direction: row;
    align-items: baseline;
    gap: 0.35rem;
    padding-top: 0;
    border-top: 0;
  }

  .meta-row + .meta-row {
    padding-left: 0.9rem;
    border-left: 1px dashed var(--border);
  }

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

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

  .blog-hero h1 {
    font-size: clamp(1.75rem, 8vw, 2.2rem);
  }

  .article-title {
    font-size: clamp(1.5rem, 7vw, 2rem);
  }

  .article-body h2 {
    margin-top: 2rem;
  }

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

  .promo-actions .btn {
    width: 100%;
  }

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

/* --------------------------------------------------------------------------
   14. 动效降级
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .post-card,
  .related-card,
  .post-nav-link,
  .filter-btn,
  .signup-modal,
  .signup-panel,
  .signup-close {
    transition: none;
  }

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

  .signup-panel {
    transform: none;
  }

  .signup-modal.is-open .signup-panel {
    transform: none;
  }
}