/* ===================== 基础 ===================== */
*,
*::before,
*::after{box-sizing:border-box}

:root{
  --bg:#F7F5F0;
  --ink:#1F1F1F;
  --muted:#6B6B6B;
  --line:rgba(31,31,31,.08);

  --c-post:#2F5D50;
  --c-photo:#A8763E;
  --c-video:#B33A3A;
  --c-audio:#6A5A9C;
  --c-file:#3C6E8F;

  --radius:.75rem;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

html{
  font-size:100%;
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  font-family:var(--sans);
  font-size:.9375rem;
  line-height:1.65;
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  background-color:var(--bg);
  background-image:
    radial-gradient(38rem 26rem at 10% 4%,  rgba(47,93,80,.08),  transparent 62%),
    radial-gradient(34rem 26rem at 92% 16%, rgba(168,118,62,.08),transparent 62%),
    radial-gradient(46rem 30rem at 50% 106%,rgba(106,90,156,.08),transparent 62%);
  background-attachment:fixed;
  background-repeat:no-repeat;
}

a{color:inherit;text-decoration:none}
button{font-family:inherit;color:inherit}
img,svg{display:block;max-width:100%}

.wrap{
  width:100%;
  max-width:67.5rem;
  margin:0 auto;
  padding:0 1.5rem;
}

/* ===================== 顶栏 ===================== */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(247,245,240,.72);
  -webkit-backdrop-filter:blur(1.25rem) saturate(1.6);
  backdrop-filter:blur(1.25rem) saturate(1.6);
  border-bottom:1px solid var(--line);
}

.header-inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  grid-template-areas:"logo nav search";
  align-items:center;
  gap:1rem;
  height:3.375rem;
  max-width:67.5rem;
  margin:0 auto;
  padding:0 1.5rem;
}

.logo{
  grid-area:logo;
  justify-self:start;
  display:flex;
  align-items:center;
  gap:.5rem;
}
.logo-mark{
  width:1.75rem;
  height:1.75rem;
  border-radius:.4375rem;
  object-fit:cover;
  box-shadow:0 .1875rem .5rem rgba(47,93,80,.3);
}
.logo-text{
  font-family:var(--serif);
  font-size:.9375rem;
  letter-spacing:.12em;
}

.nav{
  grid-area:nav;
  justify-self:center;
  display:flex;
  gap:1.5rem;
  font-size:.84375rem;
}
.nav a{
  position:relative;
  color:var(--muted);
  transition:color .22s;
}
.nav a:hover{color:var(--ink)}
.nav a.active{color:var(--ink)}
.nav a.active::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:-.5rem;
  width:.1875rem;
  height:.1875rem;
  border-radius:50%;
  background:var(--c-post);
  transform:translateX(-50%);
}

.search{
  grid-area:search;
  justify-self:end;
  display:flex;
  align-items:center;
  gap:.375rem;
  padding:.25rem .25rem .25rem .75rem;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(255,255,255,.6);
  -webkit-backdrop-filter:blur(.5rem);
  backdrop-filter:blur(.5rem);
  transition:border-color .25s,background .25s;
}
.search:focus-within{
  border-color:rgba(47,93,80,.35);
  background:rgba(255,255,255,.88);
}
.search-icon{flex:0 0 auto;color:var(--muted)}
.search input{
  width:8rem;
  border:0;
  background:transparent;
  outline:none;
  font:inherit;
  font-size:.8125rem;
  color:var(--ink);
}
.search input::placeholder{color:#9A9A9A}
.search-btn{
  border:0;
  cursor:pointer;
  padding:.32rem .85rem;
  border-radius:999px;
  background:var(--ink);
  color:#fff;
  font-size:.75rem;
  letter-spacing:.08em;
  transition:background .25s;
}
.search-btn:hover{background:var(--c-post)}

.nav-toggle,
.search-toggle{
  display:none;
  width:2.25rem;
  height:2.25rem;
  border-radius:.625rem;
  border:1px solid var(--line);
  background:rgba(255,255,255,.6);
  cursor:pointer;
  place-items:center;
  color:var(--ink);
  -webkit-backdrop-filter:blur(.5rem);
  backdrop-filter:blur(.5rem);
}

/* ===================== 页脚 ===================== */
.site-footer{
  margin-top:3.5rem;
  border-top:1px solid var(--line);
  background:rgba(255,255,255,.35);
  -webkit-backdrop-filter:blur(.75rem);
  backdrop-filter:blur(.75rem);
}
.footer-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  flex-wrap:wrap;
  padding:1.5rem 0;
  max-width:67.5rem;
  margin:0 auto;
  padding-left:1.5rem;
  padding-right:1.5rem;
  font-size:.78125rem;
  color:var(--muted);
}
.footer-links{
  display:flex;
  flex-wrap:wrap;
  gap:1.25rem;
}
.footer-links a{transition:color .22s}
.footer-links a:hover{color:var(--c-post)}
/* ===================== 左侧悬浮工具 ===================== */
.side-tools{position:fixed;left:1rem;top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:.5rem}
.tool-btn{width:2.75rem;height:2.75rem;border-radius:50%;border:1px solid rgba(255,255,255,.7);cursor:pointer;display:grid;place-items:center;color:var(--ink);background:rgba(255,255,255,.55);-webkit-backdrop-filter:blur(.875rem) saturate(1.6);backdrop-filter:blur(.875rem) saturate(1.6);box-shadow:0 .5rem 1rem -.5rem rgba(31,31,31,.4);transition:transform .25s,background .25s,color .25s,opacity .3s}
.tool-btn:hover{transform:scale(1.08);background:rgba(255,255,255,.9);color:var(--c-post)}
#topBtn{opacity:0;visibility:hidden;transform:translateY(.5rem) scale(.9)}
#topBtn.show{opacity:1;visibility:visible;transform:none}

/* ===================== 热门面板 ===================== */
.hot-panel{position:fixed;left:4.25rem;top:50%;z-index:70;width:17.5rem;max-height:72vh;overflow:auto;padding:1rem 1.1rem 1.1rem;border:1px solid rgba(255,255,255,.75);border-radius:var(--radius);background:rgba(255,255,255,.78);-webkit-backdrop-filter:blur(1.5rem) saturate(1.7);backdrop-filter:blur(1.5rem) saturate(1.7);box-shadow:0 1.5rem 3rem -1rem rgba(31,31,31,.35);opacity:0;visibility:hidden;transform:translateY(-50%) translateX(-.625rem);transition:opacity .28s,transform .28s,visibility .28s}
.hot-panel.open{opacity:1;visibility:visible;transform:translateY(-50%) translateX(0)}
.hot-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:.6rem;font-family:var(--serif);font-size:.9375rem;letter-spacing:.08em}
.hot-close{width:1.5rem;height:1.5rem;border:0;border-radius:50%;cursor:pointer;background:rgba(31,31,31,.06);color:var(--muted);font-size:1rem;line-height:1;transition:background .2s,color .2s}
.hot-close:hover{background:var(--c-post);color:#fff}
.hot-list{list-style:none;margin:0;padding:0}
.hot-list li+li{border-top:1px dashed var(--line)}
.hot-list a{display:flex;align-items:center;gap:.6rem;padding:.55rem 0;font-size:.8125rem;transition:color .2s}
.hot-list a:hover{color:var(--c-post)}
.hot-rank{flex:0 0 auto;font-family:var(--serif);font-size:.6875rem;color:var(--muted);letter-spacing:.05em}
.hot-title{flex:1 1 auto;min-width:0;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.hot-num{flex:0 0 auto;font-size:.6875rem;color:var(--muted)}

/* ===================== 通用响应式（顶栏 + 页脚） ===================== */
@media (max-width:51.25rem){
  .header-inner{
    grid-template-columns:auto 1fr auto;
    grid-template-areas:"toggle logo search";
    gap:.5rem;
    padding:0 1.25rem;
  }
  .nav-toggle{grid-area:toggle;display:grid;justify-self:start}
  .search-toggle{grid-area:search;display:grid;justify-self:end}
  .logo{grid-area:logo;justify-self:center}
  .logo-text{font-size:.875rem;letter-spacing:.06em}

  .nav{
    grid-area:auto;
    position:absolute;
    left:0;right:0;top:100%;
    display:none;
    flex-direction:column;
    gap:0;
    padding:.5rem 1.5rem 1rem;
    font-size:.9375rem;
    background:rgba(247,245,240,.96);
    -webkit-backdrop-filter:blur(1.25rem);
    backdrop-filter:blur(1.25rem);
    border-bottom:1px solid var(--line);
    box-shadow:0 1.25rem 2rem -1.5rem rgba(31,31,31,.4);
  }
  .nav.open{display:flex}
  .nav a{padding:.7rem .25rem;border-bottom:1px solid var(--line)}
  .nav a:last-child{border-bottom:0}
  .nav a.active::after{display:none}

  .search{
    position:absolute;
    left:1rem;right:1rem;top:100%;
    display:none;
    justify-self:auto;
    padding:.4rem .4rem .4rem .875rem;
    border-radius:0 0 .75rem .75rem;
    border-top:0;
    background:rgba(255,255,255,.94);
    box-shadow:0 1.25rem 2rem -1.25rem rgba(31,31,31,.4);
  }
  body.search-open .search{display:flex}
  .search input{flex:1 1 auto;width:auto}
  
    .side-tools{left:.5rem;gap:.4rem}
  .tool-btn{width:2.375rem;height:2.375rem}
  .hot-panel{left:.5rem;right:.5rem;width:auto;top:auto;bottom:1rem;transform:translateY(1rem)}
  .hot-panel.open{transform:translateY(0)}
  
}

@media (max-width:30rem){
  .footer-inner{justify-content:flex-start}
  .footer-links{gap:1rem}
}

/* ===================== 面包屑（跨页面共用） ===================== */
.breadcrumb{
  display:flex;
  align-items:center;
  gap:.4rem;
  padding:1.3rem 0 .75rem;
  font-size:.71875rem;
  letter-spacing:.03em;
  color:var(--muted);
}
.breadcrumb a{
  display:inline-flex;
  align-items:center;
  gap:.3rem;
  transition:color .22s;
}
.breadcrumb a:hover{color:var(--c-post)}
.breadcrumb svg{
  width:.75rem;
  height:.75rem;
  fill:none;
  stroke:currentColor;
  stroke-width:1.9;
  stroke-linecap:round;
  stroke-linejoin:round;
  opacity:.7;
}
.breadcrumb .sep{opacity:.4}
.breadcrumb .current{color:var(--ink);font-weight:500}