/* =========================================================
   江雪 · 纸上清寒（完整版）
   关键词：冷、静、留白、墨、雪、极淡的生机（光影微动）
   适配你现有 Hugo 模板：.wrap .card .prose .hr .sectionTitle .cta .btn
   ========================================================= */

:root{
  /* 雪纸与墨 */
  --snow1:#f6f7fb;
  --snow2:#eef1f7;
  --paper: rgba(255,255,255,.72);
  --ink:#15181f;
  --muted: rgba(0,0,0,.58);
  --muted2: rgba(0,0,0,.40);
  --line: rgba(0,0,0,.10);

  /* 版心与形状 */
  --max: 760px;
  --radius: 14px;

  /* 阴影：像纸压在桌上 */
  --shadow:
    0 20px 70px rgba(0,0,0,.10),
    0 2px 0 rgba(0,0,0,.03);

  /* 链接下划线 */
  --u: rgba(0,0,0,.22);
  --uHover: rgba(0,0,0,.38);
}

*{ box-sizing:border-box; }
html, body{ height:100%; }

body{
  margin:0;
  color: var(--ink);
  font-family: ui-serif, "Noto Serif SC","Songti SC","STSong", Georgia, "Times New Roman", serif;
  line-height: 1.92;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;

  background:
    radial-gradient(900px 640px at 18% 12%, rgba(120,150,200,.09), transparent 64%),
    radial-gradient(900px 700px at 82% 88%, rgba(120,150,200,.08), transparent 66%),
    linear-gradient(180deg, var(--snow1), var(--snow2));
}

/* 全局纸纤维/雪粒：极淡 */
body::before{
  content:"";
  position: fixed;
  inset: 0;
  pointer-events:none;
  z-index:-1;
  opacity:.40;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='280' height='280'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='280' height='280' filter='url(%23n)' opacity='.14'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

/* 冷光微动：灵动但无声 */
body::after{
  content:"";
  position: fixed;
  inset:-30%;
  pointer-events:none;
  z-index:-2;
  background:
    radial-gradient(520px 360px at 22% 22%, rgba(255,255,255,.22), transparent 70%),
    radial-gradient(520px 380px at 78% 55%, rgba(255,255,255,.16), transparent 72%),
    radial-gradient(520px 380px at 48% 92%, rgba(255,255,255,.12), transparent 72%);
  filter: blur(18px);
  opacity:.42;
  animation: jiangxue_drift 28s ease-in-out infinite alternate;
}

@keyframes jiangxue_drift{
  0%   { transform: translate3d(-2%, -1%, 0) rotate(-.1deg); }
  100% { transform: translate3d( 2%,  2%, 0) rotate(.12deg); }
}

@media (prefers-reduced-motion: reduce){
  body::after{ animation:none !important; }
}

/* 版心 */
.wrap{
  max-width: var(--max);
  margin: 0 auto;
  padding: 84px 18px 130px;
}

/* 纸页 */
.card{
  position: relative;
  padding: 48px 38px 38px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

/* 纸页内部纤维纹理（更淡） */
.card::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.22;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='360' height='360'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.92' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='360' height='360' filter='url(%23n)' opacity='.12'/%3E%3C/svg%3E");
  mix-blend-mode:multiply;
}

/* 纸页上沿/下沿极淡“压痕” */
.card::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.32;
  background:
    radial-gradient(900px 120px at 50% -10%, rgba(0,0,0,.06), transparent 66%),
    radial-gradient(900px 140px at 50% 110%, rgba(0,0,0,.05), transparent 66%);
}

/* 保证内容在纹理上层 */
header, .hr, .sectionTitle, .prose, footer, .cta, .list, .letters{
  position: relative;
  z-index: 1;
}

/* 标题：像题，不像 UI */
header{
  margin: 0 0 10px;
  text-align:left;
}

h1{
  margin: 0 0 8px;
  font-size: 34px;
  line-height: 1.18;
  letter-spacing: .2px;
}

/* 分割线：像雪上细痕 */
.hr{
  height: 1px;
  background: linear-gradient(to right, transparent, var(--line), transparent);
  margin: 20px 0 18px;
}

/* 小标题：像刊头/注记 */
.sectionTitle{
  margin: 28px 0 10px;
  font-size: 13px;
  letter-spacing: .10em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

/* 正文：读起来要“静” */
.prose{
  font-size: 19px;
  line-height: 1.92;
}

.prose p{
  margin: 0 0 18px;
}

.prose a{
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--u);
}
.prose a:hover{
  text-decoration-color: var(--uHover);
}

/* 标题层级 */
.prose h2{
  margin: 32px 0 10px;
  font-size: 24px;
  line-height: 1.26;
}
.prose h3{
  margin: 24px 0 10px;
  font-size: 20px;
  line-height: 1.28;
  color: rgba(0,0,0,.78);
}

/* 引用：像孤舟旁的静水 */
.prose blockquote{
  margin: 18px 0;
  padding: 0 0 0 16px;
  border-left: 3px solid rgba(0,0,0,.18);
  color: rgba(0,0,0,.76);
}

/* 列表 */
.prose ul, .prose ol{
  margin: 0 0 18px 1.2em;
  padding: 0;
}
.prose li{ margin: 6px 0; }

/* 图片：像贴在纸上的照片 */
.prose img{
  max-width: 100%;
  height: auto;
  display:block;
  margin: 18px auto;
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,.10);
  background: rgba(255,255,255,.6);
}

/* 代码：像铅字盒 */
.prose code, .prose pre{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace;
  font-size: .92em;
}
.prose code{
  padding: 2px 6px;
  border: 1px solid rgba(0,0,0,.12);
  border-radius: 6px;
  background: rgba(0,0,0,.03);
}
.prose pre{
  padding: 14px 16px;
  border: 1px solid rgba(0,0,0,.12);
  border-radius: 10px;
  background: rgba(0,0,0,.03);
  overflow:auto;
  margin: 18px 0;
}

/* 首页/列表页：如果你模板用了 .list .item（我之前给过），这里会变得更“纸上目录” */
.list{
  display:flex;
  flex-direction:column;
  gap: 14px;
}

.item{
  display:block;
  padding: 12px 14px;
  border: 1px solid rgba(0,0,0,.10);
  border-radius: 12px;
  text-decoration:none;
  color: inherit;
  background: rgba(255,255,255,.52);
}

.item:hover{
  background: rgba(255,255,255,.68);
}

.itemTop{
  display:flex;
  justify-content:space-between;
  gap: 12px;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(0,0,0,.55);
}

.itemTitle{
  margin-top: 6px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.25;
}

.itemDesc{
  margin-top: 6px;
  font-size: 16px;
  color: rgba(0,0,0,.68);
  line-height: 1.6;
}

/* 按钮：像纸面上的小印章 */
.cta{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin-top: 26px;
}

.btn{
  color: var(--ink);
  text-decoration:none;
  border: 1px solid rgba(0,0,0,.18);
  padding: 9px 12px;
  border-radius: 999px;
  font-size: 14px;
  background: rgba(255,255,255,.42);
}

.btn:hover{
  background: rgba(255,255,255,.64);
}

.btn.primary{
  border-color: rgba(0,0,0,.26);
  font-weight: 600;
}

/* 页脚：像题跋 */
footer{
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted2);
  font-size: 13px;
}

/* 小屏优化 */
@media (max-width: 520px){
  .wrap{ padding: 66px 14px 110px; }
  .card{ padding: 34px 20px 24px; }
  h1{ font-size: 30px; }
  .prose{ font-size: 18px; }
}