/* =========================================================
   百家利会员站 · 共享样式表 /assets/site.css
   母题：一条纵向路径 —— 刊头 · 目录 · 正文 · 归档
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink:#0B1D30;
  --ink-2:#12324A;
  --copper:#B8894A;
  --copper-light:#D9B87C;
  --cinnabar:#B23A2E;
  --celadon:#6E9A8A;
  --paper:#F4EBDD;
  --graphite:#101820;
  --haze:#A7B8C4;
  --white:#FFFFFF;

  --rule:rgba(167,184,196,.22);
  --rule-soft:rgba(167,184,196,.14);
  --rule-copper:rgba(184,137,74,.45);

  --font-display:"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SF Mono",Menlo,Consolas,"Noto Sans Mono",monospace;

  --wrap:1180px;
  --gutter:clamp(1.1rem,3vw,2.6rem);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg,picture{display:block;max-width:100%;height:auto;}
button{font:inherit;color:inherit;background:none;border:0;}
a{color:inherit;}
table{border-collapse:collapse;width:100%;}
strong,b{font-weight:700;}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.25;letter-spacing:.02em;}
p{max-width:76ch;}
.mono{font-family:var(--font-mono);letter-spacing:.06em;}
.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--copper);
}
.lede{
  font-size:clamp(1rem,1.5vw,1.15rem);
  line-height:1.8;
  max-width:66ch;
  color:rgba(244,235,221,.86);
}
.hairline{border:0;border-top:1px solid var(--rule);margin-block:clamp(1.2rem,2.5vw,2rem);}
.prose{max-width:72ch;}
.prose p + p{margin-top:1rem;}
.prose h3{margin-top:2rem;font-size:1.2rem;color:var(--copper-light);}
#main-content{scroll-margin-top:7.5rem;}

/* ---------- 4. 焦点与跳转 ---------- */
:focus-visible{
  outline:3px solid var(--celadon);
  outline-offset:3px;
  box-shadow:0 0 0 5px rgba(178,58,46,.4);
}
.skip-link{
  position:fixed;
  top:.6rem;
  left:50%;
  z-index:400;
  transform:translate(-50%,-180%);
  padding:.7rem 1.4rem;
  background:var(--celadon);
  color:#05231b;
  font-weight:700;
  letter-spacing:.08em;
  text-decoration:none;
  border:1px solid #05231b;
  transition:transform .18s ease;
}
.skip-link:focus,
.skip-link:focus-visible{transform:translate(-50%,0);}

/* ---------- 5. 布局容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{position:relative;padding-block:clamp(2.4rem,5vw,4.4rem);scroll-margin-top:7.5rem;}
.section--ink{background:var(--ink);color:var(--paper);}
.section--deep{background:var(--ink-2);color:var(--paper);}
.section--paper{background:var(--paper);color:var(--graphite);}
.section--band{
  background:linear-gradient(90deg,rgba(184,137,74,.18),rgba(178,58,46,.12));
  border-block:1px solid var(--rule-copper);
}
.section--paper .section-lead,
.section--paper .lede,
.section--paper .section-desc{color:#41505c;}
.section--paper .section-index{color:#8a5f28;}
.section--paper .aside-note{color:#4a5560;}
.section--paper .path-node::before{background:var(--paper);}
.section--paper .data-table,
.section--paper .data-table th,
.section--paper .data-table td{border-color:rgba(16,24,32,.22);}
.section--paper .data-table th{color:#8a5f28;}

/* ---------- 6. 章节头 ---------- */
.section-head{
  display:grid;
  gap:.45rem;
  margin-bottom:clamp(1.4rem,3vw,2.2rem);
  padding-left:1rem;
  border-left:3px solid var(--cinnabar);
}
.section-index{
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.2em;
  color:var(--copper);
}
.section-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.6rem,2.8vw,2.6rem);
  line-height:1.24;
  letter-spacing:.01em;
}
.section-lead{
  font-size:1rem;
  max-width:62ch;
  color:rgba(244,235,221,.82);
}
.section-desc{font-size:.9rem;color:var(--haze);}

/* ---------- 7. 页面头部与面包屑 ---------- */
.page-head{
  padding-block:clamp(1.6rem,3vw,2.6rem);
  border-bottom:1px solid var(--rule);
}
.page-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.9rem,4vw,3.2rem);
  line-height:1.16;
  letter-spacing:.01em;
  margin-block:.5rem .6rem;
}
.breadcrumb{padding-block:.9rem;border-bottom:1px solid var(--rule-soft);}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.35rem .5rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--haze);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:.5rem;}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--copper);}
.breadcrumb-link{
  text-decoration:none;
  color:var(--paper);
  border-bottom:1px solid var(--rule-copper);
  padding-bottom:1px;
  transition:color .16s ease,border-color .16s ease;
}
.breadcrumb-link:hover{color:var(--copper-light);border-color:var(--copper-light);}
.breadcrumb-current{color:var(--copper-light);}

/* ---------- 8. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.8rem 1.35rem;
  font-size:.92rem;
  font-weight:600;
  letter-spacing:.08em;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:0;
  cursor:pointer;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.btn--primary{background:var(--copper);color:#12100a;border-color:var(--copper);}
.btn--primary:hover{background:var(--copper-light);border-color:var(--copper-light);}
.btn--ghost{background:transparent;color:var(--paper);border-color:rgba(167,184,196,.5);}
.btn--ghost:hover{color:var(--copper-light);border-color:var(--copper-light);background:rgba(184,137,74,.1);}
.btn--on-paper{background:transparent;color:var(--ink);border-color:rgba(16,24,32,.45);}
.btn--on-paper:hover{background:var(--ink);color:var(--paper);border-color:var(--ink);}
.btn--link{
  padding:.2rem 0;
  border:0;
  border-bottom:1px solid var(--copper);
  color:var(--copper-light);
  background:none;
}
.btn--link:hover{color:var(--paper);border-bottom-color:var(--cinnabar);}
.btn-row{display:flex;flex-wrap:wrap;gap:.7rem;align-items:center;}

/* ---------- 9. 网格 ---------- */
.grid{display:grid;gap:clamp(1rem,2vw,1.6rem);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr));}
.split{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,3fr);
  gap:clamp(1.4rem,3vw,3rem);
  align-items:start;
}

/* ---------- 10. 编辑部目录索引 ---------- */
.index-list{display:grid;border-top:1px solid var(--rule);}
.index-row{
  display:grid;
  grid-template-columns:4.2rem minmax(0,1fr) auto;
  gap:.3rem 1rem;
  align-items:baseline;
  padding-block:.95rem;
  border-bottom:1px solid var(--rule-soft);
  text-decoration:none;
  color:inherit;
  transition:background-color .16s ease,padding-left .16s ease;
}
.index-row:hover{background:rgba(184,137,74,.1);padding-left:.4rem;}
.index-row:hover .index-num{color:var(--copper-light);}
.index-num{
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.12em;
  color:var(--copper);
}
.index-title{font-family:var(--font-display);font-size:1.06rem;font-weight:700;letter-spacing:.02em;}
.index-desc{
  grid-column:2 / -1;
  font-size:.86rem;
  line-height:1.65;
  color:var(--haze);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}

/* ---------- 11. 路径轴 ---------- */
.path-axis{position:relative;padding-left:2.2rem;border-left:1px solid var(--rule-copper);}
.path-node{position:relative;padding-block:.55rem 1.5rem;}
.path-node::before{
  content:"";
  position:absolute;
  left:-2.2rem;
  top:1.1rem;
  width:.65rem;
  height:.65rem;
  border:1px solid var(--copper);
  background:var(--ink);
  transform:translateX(-50%) rotate(45deg);
}
.path-node[data-state="current"]::before{background:var(--cinnabar);border-color:var(--cinnabar);}
.path-node[data-state="done"]::before{background:var(--celadon);border-color:var(--celadon);}

/* ---------- 12. 标签与状态 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.18rem .6rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
  border:1px solid rgba(167,184,196,.45);
  border-radius:2px;
  color:var(--haze);
}
.tag--copper{color:var(--copper-light);border-color:rgba(184,137,74,.7);}
.tag--cinnabar{color:#F3C7BF;border-color:rgba(178,58,46,.75);background:rgba(178,58,46,.18);}
.tag--celadon{color:#CFE6DC;border-color:rgba(110,154,138,.8);background:rgba(110,154,138,.18);}
.status-dot{
  display:inline-block;
  width:.5rem;
  height:.5rem;
  border-radius:50%;
  background:var(--celadon);
  margin-right:.4rem;
  vertical-align:baseline;
}

/* ---------- 13. 旁注 ---------- */
.aside-note{
  border-left:2px solid var(--copper);
  padding:.2rem 0 .2rem .9rem;
  font-size:.85rem;
  line-height:1.7;
  color:var(--haze);
}
.note-strong{color:var(--paper);font-weight:600;}

/* ---------- 14. 图片容器（页面阶段放入占位图） ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:4 / 3;
  background:linear-gradient(150deg,#12324A,#0B1D30 72%);
  border:1px solid var(--rule-copper);
}
.media-frame--portrait{aspect-ratio:3 / 4;}
.media-frame--wide{aspect-ratio:16 / 9;}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  filter:saturate(.92) contrast(1.04);
}
.media-frame::before,
.media-frame::after{
  content:"";
  position:absolute;
  width:1.1rem;
  height:1.1rem;
  border:1px solid var(--copper-light);
  opacity:.85;
  pointer-events:none;
}
.media-frame::before{top:.5rem;left:.5rem;border-right:0;border-bottom:0;}
.media-frame::after{bottom:.5rem;right:.5rem;border-left:0;border-top:0;}
.media-caption{
  margin-top:.55rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--haze);
}

/* ---------- 15. 数据表 ---------- */
.data-table{width:100%;font-size:.9rem;border-top:1px solid rgba(167,184,196,.35);}
.data-table th,
.data-table td{
  text-align:left;
  padding:.7rem .6rem;
  border-bottom:1px solid var(--rule-soft);
  vertical-align:top;
}
.data-table th{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  font-weight:600;
  color:var(--copper-light);
}
.data-table td.mono{font-family:var(--font-mono);letter-spacing:.04em;}

/* =========================================================
   头部
   ========================================================= */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(167,184,196,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(167,184,196,.055) 1px,transparent 1px);
  background-size:64px 64px,64px 64px;
  border-bottom:1px solid var(--rule-copper);
}
.header-utility{
  background:rgba(18,50,74,.78);
  border-bottom:1px solid var(--rule);
}
.utility-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  min-height:2.5rem;
}
.utility-note{
  margin:0;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.14em;
  color:var(--haze);
  max-width:none;
}
.utility-cta{
  font-size:.78rem;
  letter-spacing:.12em;
  text-decoration:none;
  color:var(--copper-light);
  border-bottom:1px solid var(--copper);
  padding-bottom:.15rem;
  white-space:nowrap;
  transition:color .16s ease,border-color .16s ease;
}
.utility-cta:hover{color:var(--paper);border-bottom-color:var(--cinnabar);}

/* 居中刊头 */
.masthead{
  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
  gap:.5rem;
  padding-block:clamp(1rem,2vw,1.7rem) clamp(.7rem,1.5vw,1.15rem);
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:.85rem;
  text-decoration:none;
  padding:.2rem .4rem;
}
.brand-mark{
  position:relative;
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:clamp(2.4rem,4vw,3rem);
  height:clamp(2.4rem,4vw,3rem);
  border:1px solid var(--copper);
  color:var(--copper-light);
  font-family:var(--font-display);
  font-size:clamp(1.1rem,1.9vw,1.4rem);
  line-height:1;
  transition:border-color .16s ease,background-color .16s ease;
}
.brand-mark::after{
  content:"";
  position:absolute;
  inset:4px;
  border:1px solid rgba(184,137,74,.35);
}
.brand:hover .brand-mark{border-color:var(--copper-light);background:rgba(184,137,74,.14);}
.brand-text{display:flex;flex-direction:column;align-items:flex-start;gap:.15rem;text-align:left;}
.brand-name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.6rem,3.6vw,2.5rem);
  letter-spacing:.12em;
  line-height:1.05;
  color:var(--paper);
}
.brand-line{
  font-size:.78rem;
  letter-spacing:.14em;
  color:var(--haze);
}

/* 栏目索引导航 */
.nav-bar{
  border-top:1px solid var(--rule);
  background:rgba(11,29,48,.92);
}
.nav-inner{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:3.1rem;
}
.nav-list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:stretch;
}
.nav-item{display:flex;}
.nav-link{
  display:inline-flex;
  align-items:baseline;
  gap:.45rem;
  padding:.95rem clamp(.55rem,1.1vw,.95rem);
  font-size:.94rem;
  letter-spacing:.06em;
  text-decoration:none;
  color:rgba(244,235,221,.88);
  border-bottom:2px solid transparent;
  transition:color .16s ease,background-color .16s ease,border-color .16s ease;
}
.nav-link::before{
  content:attr(data-index);
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.1em;
  color:var(--copper);
  transition:color .16s ease;
}
.nav-link:hover{
  color:var(--copper-light);
  background:rgba(184,137,74,.12);
  border-bottom-color:var(--copper);
}
.nav-link:hover::before{color:var(--copper-light);}
.nav-link[aria-current="page"]{
  color:var(--white);
  font-weight:600;
  background:rgba(178,58,46,.16);
  border-bottom-color:var(--cinnabar);
}
.nav-link[aria-current="page"]::before{color:var(--cinnabar);}

/* 移动导航按钮（桌面隐藏） */
.nav-toggle{
  display:none;
  align-items:center;
  justify-content:space-between;
  gap:.8rem;
  width:100%;
  min-height:2.9rem;
  padding:.7rem .1rem;
  background:none;
  border:0;
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.18em;
  cursor:pointer;
}
.nav-toggle-text{white-space:nowrap;}
.nav-toggle-bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:20px;
}
.nav-toggle-bar{
  display:block;
  width:100%;
  height:1px;
  background:var(--copper-light);
  transition:transform .18s ease,background-color .16s ease;
}
.nav-toggle:hover .nav-toggle-bar{background:var(--paper);}
[data-nav][data-open="true"] .nav-toggle-bar:first-child{transform:translateY(3px) rotate(45deg);}
[data-nav][data-open="true"] .nav-toggle-bar:last-child{transform:translateY(-3px) rotate(-45deg);}

/* 阅读进度 */
.header-progress{
  height:2px;
  background:rgba(167,184,196,.16);
  overflow:hidden;
}
.header-progress-bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--copper),var(--cinnabar));
  transition:width .12s linear;
}

/* 滚动收细刊头 */
.site-header.is-condensed .header-utility{display:none;}
.site-header.is-condensed .masthead{padding-block:.55rem;}
.site-header.is-condensed .brand-mark{width:1.9rem;height:1.9rem;font-size:.95rem;}
.site-header.is-condensed .brand-name{font-size:1.15rem;letter-spacing:.1em;}
.site-header.is-condensed .brand-line{display:none;}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(167,184,196,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(167,184,196,.045) 1px,transparent 1px);
  background-size:72px 72px,72px 72px;
  border-top:2px solid var(--copper);
}
.footer-top{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:1rem 2rem;
  padding-block:clamp(2rem,4vw,3rem) clamp(1.2rem,2.4vw,1.8rem);
}
.footer-closing{
  font-family:var(--font-display);
  font-size:clamp(1.2rem,2.3vw,1.8rem);
  line-height:1.5;
  letter-spacing:.03em;
  max-width:32ch;
  color:var(--copper-light);
  border-left:2px solid var(--cinnabar);
  padding-left:1.1rem;
}
.footer-brand{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.16em;
  color:var(--haze);
  max-width:none;
}
.footer-brand-mono{color:var(--copper-light);}
.footer-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(1.4rem,3vw,2.8rem);
  padding-block:clamp(1.8rem,3.5vw,2.8rem);
  border-top:1px solid var(--rule);
}
.footer-col{min-width:0;}
.footer-heading{
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.18em;
  color:var(--celadon);
  margin-bottom:.9rem;
  padding-bottom:.5rem;
  border-bottom:1px solid var(--rule-soft);
}
.footer-links{display:grid;gap:.55rem;}
.footer-link{
  display:inline-block;
  font-size:.9rem;
  text-decoration:none;
  color:rgba(244,235,221,.9);
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease,padding-left .16s ease;
}
.footer-link:hover{
  color:var(--copper-light);
  border-bottom-color:var(--copper);
  padding-left:.25rem;
}
.contact-list{display:grid;gap:.8rem;margin-bottom:.2rem;}
.contact-row{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:.15rem .6rem;
  align-items:center;
}
.contact-label{
  grid-column:1 / -1;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.16em;
  color:var(--celadon);
}
.contact-value{
  font-size:.86rem;
  line-height:1.6;
  color:var(--paper);
  word-break:break-word;
}
.copy-btn{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.12em;
  color:var(--copper-light);
  border:1px solid rgba(184,137,74,.55);
  padding:.22rem .5rem;
  cursor:pointer;
  white-space:nowrap;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.copy-btn:hover{background:rgba(184,137,74,.18);color:var(--paper);border-color:var(--copper-light);}
.copy-btn[data-copied="true"]{
  border-color:var(--celadon);
  color:#D6EDE4;
  background:rgba(110,154,138,.22);
}
.contact-note{
  margin-top:.9rem;
  font-size:.76rem;
  line-height:1.7;
  color:var(--haze);
  max-width:38ch;
}
.copy-status{
  min-height:1.3em;
  margin-top:.45rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:var(--celadon);
  max-width:none;
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:.5rem 1.5rem;
  padding-block:1.1rem 1.7rem;
  border-top:1px solid var(--rule);
  font-size:.74rem;
  letter-spacing:.06em;
  color:var(--haze);
}
.footer-icp,
.footer-copyright{max-width:none;}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1040px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .split{grid-template-columns:1fr;}
}
@media (max-width:980px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:860px){
  .nav-inner{
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    min-height:0;
  }
  .nav-toggle{display:flex;}
  .nav-list{
    display:none;
    flex-direction:column;
    flex-wrap:nowrap;
    justify-content:flex-start;
    align-items:stretch;
    border-top:1px solid var(--rule);
    padding-block:.35rem .9rem;
    max-height:calc(100vh - 10rem);
    overflow-y:auto;
  }
  [data-nav][data-open="true"] .nav-list{display:flex;}
  .nav-item{display:block;}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:.78rem .1rem;
    font-size:.95rem;
    border-bottom:1px solid var(--rule-soft);
  }
  .nav-link[aria-current="page"]{padding-left:.6rem;}
  .section{padding-block:clamp(2rem,6vw,3rem);}
}
@media (max-width:760px){
  body{font-size:16px;}
  .grid--2{grid-template-columns:1fr;}
}
@media (max-width:620px){
  .brand{flex-direction:column;gap:.5rem;}
  .brand-text{align-items:center;text-align:center;}
  .brand-line{font-size:.72rem;letter-spacing:.08em;}
  .utility-note{display:none;}
  .utility-inner{justify-content:center;}
  .footer-top{flex-direction:column;align-items:flex-start;}
  .footer-grid{grid-template-columns:1fr;}
  .index-row{grid-template-columns:3.4rem minmax(0,1fr);}
  .index-desc{grid-column:1 / -1;}
  .footer-legal{flex-direction:column;}
}

/* ---------- 打印 ---------- */
@media print{
  .site-header,
  .site-footer,
  .skip-link,
  .copy-btn,
  .media-frame::before,
  .media-frame::after{display:none !important;}
  body{background:#fff;color:#000;font-size:11pt;}
  a{color:#000;text-decoration:underline;}
  .section{padding-block:.8rem;border:0;}
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}