/* ===========================================================
   VPNPF 博客样式包 —— 列表页与文章页专属样式
   颜色 / 字体 / 圆角 / 阴影一律引用 base.css 的 :root 设计令牌
   =========================================================== */

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

/* ---------- 1. 阅读列(列表页与文章页共用同一条列) ---------- */
.reading-wrap{
  width: 100%;
  max-width: calc(var(--blog-read) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ===========================================================
   2. 博客列表页
   =========================================================== */
.blog-page{
  padding-bottom: 3.5rem;
}

.blog-masthead{
  padding-top: 2.25rem;
}

.blog-masthead .reading-wrap{
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.masthead-rule{
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--ink) 0 54%, var(--accent) 54% 100%);
}

.masthead-meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 1rem 0 .7rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--text-muted);
}

.blog-masthead h1{
  margin: 0 0 .8rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.9rem, 1.45rem + 2vw, 3rem);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--text);
  text-wrap: pretty;
}

.masthead-sum{
  max-width: 46rem;
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-muted);
}

.tag-filter{
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.5rem;
}

.tag-btn{
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  padding: .45rem .95rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-panel);
  color: var(--text-muted);
  font-family: inherit;
  font-size: .875rem;
  line-height: 1.4;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

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

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

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

.blog-list{
  padding-top: 1.9rem;
}

.post-grid{
  display: grid;
  gap: 1.15rem;
}

.post-card{
  position: relative;
  padding: 1.35rem 1.5rem 1.4rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-indigo);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.post-card::before{
  content: "";
  position: absolute;
  left: 0;
  top: 1.35rem;
  bottom: 1.4rem;
  width: 3px;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--accent);
  opacity: 0;
  transition: opacity .2s ease;
}

.post-card:hover{
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: var(--shadow-indigo-2);
}

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

.post-meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  margin: 0 0 .6rem;
  font-size: .8rem;
  color: var(--text-muted);
}

.post-meta time{
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .02em;
}

.post-title{
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.15rem, 1.05rem + .5vw, 1.4rem);
  line-height: 1.45;
  letter-spacing: -.015em;
  color: var(--text);
  text-wrap: pretty;
}

.post-title a{
  color: inherit;
  text-decoration: none;
}

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

.post-sum{
  margin: 0 0 1.05rem;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.post-empty{
  margin: 0;
  padding: 2rem 1.25rem;
  background: var(--bg-panel2);
  border-radius: var(--r-md);
  text-align: center;
  color: var(--text-muted);
  font-size: .95rem;
}

/* ===========================================================
   3. 文章页:面包屑(与页头留出呼吸空间)
   =========================================================== */
.breadcrumb{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  width: 100%;
  max-width: calc(var(--blog-read) + var(--gutter) * 2);
  margin: 1.6rem auto 0;
  padding-inline: var(--gutter);
  font-size: .85rem;
  color: var(--text-muted);
}

.breadcrumb ol,
.breadcrumb ul{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li{
  display: flex;
  align-items: center;
  gap: .5rem;
  min-width: 0;
}

.breadcrumb li + li::before{
  content: "/";
  color: color-mix(in srgb, var(--text-muted) 55%, transparent);
}

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

.breadcrumb a:hover{
  color: var(--text);
  text-decoration: underline;
}

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

/* ===========================================================
   4. 文章页:杂志头版 Hero(magazine-rule)
   =========================================================== */
.article-hero{
  padding-block: 1.5rem 0;
}

.article-hero .reading-wrap{
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.article-hero .masthead-rule{
  margin-bottom: 1rem;
}

.article-meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem .8rem;
  margin: 0 0 .8rem;
  font-size: .85rem;
  color: var(--text-muted);
}

.article-meta time{
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .02em;
}

.article-hero h1{
  margin: 0 0 .85rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.75rem, 1.35rem + 1.7vw, 2.6rem);
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--text);
  text-wrap: pretty;
}

.article-sum{
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-muted);
}

.article-body{
  padding-top: .4rem;
}

/* 正文列:与面包屑/hero 同一条阅读列(单列式),不再单独收窄居中 */
.article-body .prose{
  max-width: none;
  margin-inline: 0;
}

/* ===========================================================
   5. 正文排版
   =========================================================== */
.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 a{
  color: var(--accent-dark);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .18em;
}

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

.prose strong{
  font-weight: 600;
}

.prose ul,
.prose ol{
  margin: 0 0 1.25rem;
  padding-left: 1.35rem;
}

.prose li{
  margin-bottom: .5rem;
  line-height: 1.85;
}

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

.prose ol > li::marker{
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: .9em;
}

.prose hr{
  border: 0;
  height: 1px;
  margin: 2rem 0;
  background: var(--border);
}

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

.prose h2{
  margin: 2.6rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.25rem, 1.12rem + .7vw, 1.6rem);
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--text);
  text-wrap: pretty;
}

.prose h2::before{
  content: counter(h2c, decimal-leading-zero);
  display: inline-block;
  margin-right: .55rem;
  padding: .06em .38em;
  border: 1px solid var(--accent);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: .6em;
  font-weight: 400;
  color: var(--accent);
  letter-spacing: .02em;
  vertical-align: .14em;
}

.prose h2::after{
  content: "";
  display: block;
  width: 2.75rem;
  height: 2px;
  margin-top: .6rem;
  border-radius: 1px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.prose h3{
  margin: 2rem 0 .7rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.08rem, 1rem + .4vw, 1.3rem);
  line-height: 1.5;
  letter-spacing: -.005em;
  color: var(--text);
  text-wrap: pretty;
}

.prose h3::before{
  content: "";
  display: inline-block;
  width: .55rem;
  height: .55rem;
  margin-right: .5rem;
  border: 2px solid var(--accent);
  border-radius: 2px;
  vertical-align: .02em;
}

/* ---------- 5.1 表格:深色表头 + 斑马纹 + hover,窄屏横滑 ---------- */
.prose table{
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  background: var(--bg-panel);
  font-size: .94rem;
}

.prose thead th{
  padding: .7rem .9rem;
  background: var(--ink);
  color: var(--on-ink);
  font-weight: 500;
  font-size: .85rem;
  letter-spacing: .02em;
  text-align: left;
  white-space: nowrap;
}

.prose tbody td{
  padding: .7rem .9rem;
  border-top: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.75;
}

.prose tbody tr:nth-child(even){
  background: var(--bg-panel2);
}

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

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

/* ---------- 5.2 代码:终端窗 ---------- */
.prose :not(pre) > code{
  padding: .12em .38em;
  border-radius: var(--r-sm);
  background: var(--bg-panel2);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: .88em;
}

.prose pre{
  position: relative;
  margin: 1.5rem 0;
  padding: 2.4rem 1.1rem 1.1rem;
  border-radius: var(--r-md);
  background: var(--ink);
  color: var(--on-ink);
  font-family: var(--font-mono);
  font-size: .85rem;
  line-height: 1.7;
  overflow-x: auto;
  box-shadow: var(--shadow-ink);
}

.prose pre::before{
  content: "\25CF \25CF \25CF";
  position: absolute;
  top: .75rem;
  left: 1.1rem;
  font-size: .6rem;
  letter-spacing: .3em;
  color: color-mix(in srgb, var(--on-ink) 40%, transparent);
}

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

/* ---------- 5.3 引用块 ---------- */
.prose blockquote{
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: var(--bg-panel);
  color: var(--text-muted);
}

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

/* ---------- 5.4 callout:左色条 + 图标徽 + 变体 tint ---------- */
.prose .callout,
.callout{
  position: relative;
  margin: 1.5rem 0;
  padding: 1rem 1.15rem 1rem 3.1rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  font-size: .96rem;
  line-height: 1.8;
}

.callout::before{
  content: "i";
  position: absolute;
  left: .95rem;
  top: 1rem;
  display: grid;
  place-items: center;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg-panel);
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1;
}

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

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

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

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

.callout-ok::before{
  content: "\2713";
  background: var(--success);
}

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

.callout-err::before{
  content: "\00D7";
  background: var(--error);
}

/* ---------- 5.5 步骤列表 ---------- */
.prose .steps,
.steps{
  counter-reset: step;
  list-style: none;
  margin: 1.6rem 0;
  padding: 0;
}

.steps > li{
  position: relative;
  counter-increment: step;
  margin: 0 0 1.1rem;
  padding-left: 2.6rem;
  line-height: 1.8;
}

.steps > li::before{
  content: counter(step);
  position: absolute;
  left: 0;
  top: .15rem;
  display: grid;
  place-items: center;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  background: var(--ink);
  color: var(--on-ink);
  font-family: var(--font-mono);
  font-size: .78rem;
  line-height: 1;
}

/* ---------- 5.6 数据卡网格(两档以上颜色变化) ---------- */
.prose .stat-grid,
.stat-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 1rem;
  margin: 1.75rem 0;
}

.stat-card{
  position: relative;
  padding: 1.15rem 1.15rem 1.2rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-indigo);
  overflow: hidden;
}

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

.stat-card:nth-child(2n){
  background: color-mix(in srgb, var(--bg-panel2) 55%, var(--bg-panel));
}

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

.stat-card:nth-child(3n)::before{
  background: linear-gradient(90deg, var(--iris-pink), var(--iris-cyan));
}

.stat-num{
  display: block;
  font-family: var(--font-mono);
  font-size: 1.55rem;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--text);
}

.stat-label{
  display: block;
  margin-top: .35rem;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---------- 5.7 勾叉清单(容器只做行卡装饰,不加任何语义标记) ---------- */
.prose .check-list,
.check-list{
  display: grid;
  gap: .6rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}

.check-list > li{
  margin: 0;
  padding: .8rem 1rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  font-size: .97rem;
  line-height: 1.8;
  transition: border-color .18s ease;
}

.check-list > li:hover{
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

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

/* ---------- 5.8 结论块 ---------- */
.prose .verdict,
.verdict{
  margin: 1.75rem 0;
  padding: 1.05rem 1.2rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: var(--bg-panel);
  box-shadow: var(--shadow-indigo);
  line-height: 1.85;
}

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

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

/* ===========================================================
   6. 文末推广块(全站唯一)
   =========================================================== */
.promo-block{
  position: relative;
  margin: 2.75rem 0 0;
  padding: 1.9rem 1.7rem;
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 150% at 88% -30%, color-mix(in srgb, var(--iris-pink) 32%, transparent) 0%, transparent 58%),
    radial-gradient(90% 130% at 100% 120%, color-mix(in srgb, var(--iris-cyan) 22%, transparent) 0%, transparent 60%),
    var(--ink);
  color: var(--on-ink);
  box-shadow: var(--shadow-ink);
  overflow: hidden;
}

.promo-block::before{
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-light), var(--accent) 45%, transparent);
}

.pb-brand{
  position: relative;
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: .02em;
  color: var(--on-ink);
}

.pb-line{
  position: relative;
  max-width: 38rem;
  margin: 0 0 1.35rem;
  font-size: .97rem;
  line-height: 1.85;
  color: var(--on-ink-muted);
}

.promo-block .btn-primary{
  background: var(--bg-panel);
  border-color: var(--bg-panel);
  color: var(--text);
}

.promo-block .btn-primary:hover{
  background: color-mix(in srgb, var(--bg-panel) 88%, var(--iris-lav));
  border-color: color-mix(in srgb, var(--bg-panel) 88%, var(--iris-lav));
}

.promo-block .btn-secondary{
  background: transparent;
  border-color: color-mix(in srgb, var(--on-ink) 42%, transparent);
  color: var(--on-ink);
}

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

/* ===========================================================
   7. 延伸阅读 + 上一篇 / 下一篇(垫距合计 ≤5rem)
   =========================================================== */
#related-posts{
  padding-top: 2.25rem;
}

.related-head{
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.15rem, 1.05rem + .5vw, 1.4rem);
  letter-spacing: -.01em;
  color: var(--text);
  text-wrap: pretty;
}

.related-head::after{
  content: "";
  display: block;
  width: 2.5rem;
  height: 2px;
  margin-top: .55rem;
  border-radius: 1px;
  background: var(--accent);
}

.related-grid{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.35rem;
}

.related-card{
  display: block;
  padding: 1.05rem 1.1rem 1.15rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-indigo);
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.related-card:hover{
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: var(--shadow-indigo-2);
}

.related-meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0 0 .55rem;
  font-size: .78rem;
  color: var(--text-muted);
}

.related-meta time{
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .02em;
}

.related-title{
  margin: 0 0 .7rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.55;
  letter-spacing: -.01em;
  color: var(--text);
  text-wrap: pretty;
}

.related-more{
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-size: .85rem;
  color: var(--accent-dark);
}

.related-card:hover .related-more{
  color: var(--accent);
}

.related-more svg{
  display: block;
  flex-shrink: 0;
}

#post-nav{
  display: flex;
  gap: 1rem;
  padding: 2.25rem 0 2.5rem;
}

.post-nav-link{
  display: block;
  flex: 1 1 0;
  min-width: 0;
  padding: 1rem 1.15rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-indigo);
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.post-nav-link:hover{
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: var(--shadow-indigo-2);
}

.post-nav-link.is-next{
  margin-left: auto;
  text-align: right;
}

.pn-dir{
  display: block;
  margin-bottom: .4rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--accent-dark);
}

.pn-title{
  display: block;
  font-size: .95rem;
  line-height: 1.6;
  color: var(--text);
}

@media (max-width: 900px){
  .related-grid{
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px){
  #post-nav{
    flex-direction: column;
  }

  .post-nav-link.is-next{
    margin-left: 0;
    text-align: left;
  }
}

/* ===========================================================
   8. 文末注册引导弹窗
   =========================================================== */
body.has-modal{
  overflow: hidden;
}

.signup-modal{
  position: fixed;
  inset: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: color-mix(in srgb, var(--ink) 58%, transparent);
  opacity: 0;
  visibility: hidden;
  transition: opacity .22s ease, visibility .22s ease;
}

.signup-modal:focus{
  outline: none;
}

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

.signup-modal-panel{
  position: relative;
  width: 100%;
  max-width: 26rem;
  padding: 1.75rem 1.6rem 1.6rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: 0 28px 60px -22px var(--shadow-indigo-2);
  transform: translateY(12px) scale(.98);
  transition: transform .24s ease;
}

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

.sm-close{
  position: absolute;
  top: .6rem;
  right: .6rem;
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 50%;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease;
}

.sm-close:hover{
  border-color: var(--border);
  color: var(--text);
}

.sm-close svg{
  display: block;
}

.sm-brand{
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: .02em;
  color: var(--text);
}

.sm-line{
  margin: 0 0 1.2rem;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.sm-actions{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem;
}

.sm-note{
  margin: 1rem 0 0;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ===========================================================
   9. 悬浮 CTA(文章页搜索落地用;列表页不产出该组件)
   =========================================================== */
.float-cta{
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  max-width: calc(100vw - 2rem);
  padding: .75rem 1.15rem;
  border-radius: var(--r-pill);
  background: var(--ink);
  color: var(--on-ink);
  font-size: .9rem;
  line-height: 1.3;
  text-decoration: none;
  box-shadow: 0 16px 32px -14px var(--shadow-ink);
  transition: transform .2s ease, box-shadow .2s ease;
}

.float-cta:hover{
  transform: translateY(-2px);
  box-shadow: 0 20px 36px -14px var(--shadow-ink);
}

.float-cta svg{
  display: block;
  flex-shrink: 0;
}

@media (max-width: 640px){
  .float-cta{
    right: .75rem;
    bottom: calc(.75rem + env(safe-area-inset-bottom, 0px));
    padding: .6rem .9rem;
    font-size: .82rem;
  }
}

/* ===========================================================
   10. 动效降级
   =========================================================== */
@media (prefers-reduced-motion: reduce){
  .post-card,
  .related-card,
  .post-nav-link,
  .tag-btn,
  .float-cta,
  .signup-modal,
  .signup-modal-panel,
  .check-list > li{
    transition: none;
  }

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