/* =============================================================
   北单指南 · 共享样式表 /assets/site.css
   技术蓝图式网格 · 草原青绿 #1E7A6B + 北单品牌橙 #F26B38
   ============================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,pre{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;border-spacing:0}
summary{list-style:none}
summary::-webkit-details-marker{display:none}
hr{margin:0;border:0}

/* ---------- 2. 变量 ---------- */
:root{
  --c-green:#1E7A6B;
  --c-green-deep:#14574C;
  --c-green-mist:#DFEDE9;
  --c-orange:#F26B38;
  --c-orange-deep:#C2440F;
  --c-orange-mist:#FDE6DC;
  --c-paper:#F7FAF9;
  --c-ink:#26333B;
  --c-ink-mid:#5B6E78;
  --c-amber:#D98E2B;

  --font-sans:'Noto Sans SC','Source Han Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','Roboto Mono','SFMono-Regular',monospace;

  --gutter:24px;
  --maxw:1320px;
  --ease-out:cubic-bezier(.2,.7,.3,1);
  --hair:1px solid rgba(38,51,59,.14);
  --hair-green:1px solid rgba(30,122,107,.32);
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--c-ink);
  background-color:var(--c-paper);
  background-image:
    linear-gradient(to right, rgba(30,122,107,.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30,122,107,.07) 1px, transparent 1px);
  background-size:96px 96px;
  border-left:1px solid rgba(30,122,107,.28);
  border-right:1px solid rgba(30,122,107,.28);
  min-height:100vh;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,h6{
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.15;
  color:var(--c-ink);
}
strong,b{font-weight:900}
p{max-width:42em}
:focus-visible{outline:3px solid var(--c-orange);outline-offset:2px}
.site-footer :focus-visible{outline-color:var(--c-orange)}
#main-content{display:block;min-height:60vh}
[id]{scroll-margin-top:110px}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* 文本工具 */
.mono{font-family:var(--font-mono);letter-spacing:.04em}
.muted{color:var(--c-ink-mid)}
.accent{color:var(--c-orange-deep)}
.num{font-family:var(--font-mono);font-size:1.06em;letter-spacing:.04em;font-weight:500}
.num--stat{display:block;font-size:clamp(26px,3.6vw,42px);font-weight:700;line-height:1;color:var(--c-green-deep)}
.num--count{color:var(--c-amber)}
.lead{font-size:18px;line-height:1.75;color:var(--c-ink-mid)}
.eyebrow{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:var(--c-orange-deep);text-transform:uppercase}
.rule{height:1px;background:var(--hair-green);border:0;margin:32px 0}
.stack{display:flex;flex-direction:column;gap:20px}

/* ---------- 4. 布局容器 ---------- */
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
.shell-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:28px;align-items:start}
.grid{display:grid;gap:24px;grid-template-columns:minmax(0,1fr)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.split{display:grid;gap:32px;grid-template-columns:minmax(0,1fr)}
@media (min-width:1024px){
  .shell-grid{grid-template-columns:minmax(180px,220px) minmax(0,1fr);gap:48px}
  .shell-grid--wide{grid-template-columns:minmax(220px,280px) minmax(0,1fr)}
}
@media (min-width:960px){
  .split--4-8{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
  .split--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
  .split--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
}

/* ---------- 5. 页头：框架式导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--c-paper);
  border-bottom:1px solid var(--c-green);
}
.skip-link{
  position:absolute;
  left:12px;
  top:-72px;
  z-index:120;
  display:inline-block;
  padding:11px 18px;
  font-size:13px;
  letter-spacing:.06em;
  background:var(--c-ink);
  color:var(--c-paper);
  border:1px solid var(--c-green);
  transition:top .18s var(--ease-out);
}
.skip-link:focus{top:10px}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  pointer-events:none;
  z-index:3;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:var(--c-orange);
  transition:width .08s linear;
}

.header-band{position:relative;background:var(--c-paper)}
.header-band__inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(12px,2vw,26px);
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
  min-height:64px;
}

/* 品牌 */
.brand{display:flex;align-items:center;gap:11px;min-width:0;padding:6px 0}
.brand__mark{
  flex:none;
  width:34px;height:34px;
  display:grid;place-items:center;
  background:var(--c-green);
  border:1px solid var(--c-green-deep);
  color:var(--c-paper);
  font-size:16px;
  font-weight:900;
  line-height:1;
}
.brand__text{display:flex;flex-direction:column;min-width:0;gap:2px}
.brand__name{font-size:19px;font-weight:900;letter-spacing:-.02em;line-height:1.15;color:var(--c-ink)}
.brand__tagline{
  font-size:11.5px;
  letter-spacing:.05em;
  line-height:1.35;
  color:var(--c-ink-mid);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

/* 主导航 */
.site-nav{min-width:0;justify-self:end}
.site-nav__list{display:flex;flex-wrap:wrap;gap:2px;justify-content:flex-end}
.site-nav__item{display:block}
.site-nav__link{
  display:inline-flex;
  align-items:center;
  min-height:38px;
  padding:9px 13px;
  font-size:13px;
  letter-spacing:.08em;
  line-height:1;
  color:var(--c-ink);
  border:1px solid transparent;
  transition:color .15s ease,border-color .18s var(--ease-out),background-color .18s var(--ease-out);
}
.site-nav__link:hover{color:var(--c-green-deep);border-color:var(--c-green);background:var(--c-green-mist)}
.site-nav__link[aria-current="page"]{
  color:var(--c-green-deep);
  border-color:var(--c-green);
  background:var(--c-green-mist);
}

/* 头部右侧动作区 */
.header-actions{display:flex;align-items:center;gap:12px;justify-content:flex-end}
.version-badge{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:6px 10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.03em;
  line-height:1.2;
  white-space:nowrap;
  color:var(--c-green-deep);
  background:var(--c-green-mist);
  border:1px solid var(--c-green);
}
.version-badge__dot{flex:none;width:6px;height:6px;background:var(--c-orange)}
.nav-cta{white-space:nowrap}

/* 汉堡按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:10px 13px;
  font-size:13px;
  letter-spacing:.08em;
  color:var(--c-green-deep);
  background:var(--c-paper);
  border:1px solid var(--c-green);
  transition:background-color .18s var(--ease-out),color .18s var(--ease-out);
}
.nav-toggle:hover{background:var(--c-green-mist)}
.nav-toggle__bars{display:block;width:18px}
.nav-toggle__bars span{
  display:block;
  height:1.5px;
  margin:3.5px 0;
  background:currentColor;
  transition:transform .18s var(--ease-out),opacity .18s var(--ease-out);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

/* 坐标尺带 */
.header-coord{
  display:flex;
  align-items:center;
  gap:14px;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
  height:22px;
  overflow:hidden;
  border-top:1px solid rgba(30,122,107,.24);
  background:linear-gradient(to bottom,rgba(223,237,233,.8),rgba(247,250,249,0));
}
.header-coord__label{
  flex:none;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  line-height:1;
  color:var(--c-ink-mid);
  white-space:nowrap;
}
.header-coord__label--end{color:var(--c-green-deep)}
.header-coord__rule{
  flex:1 1 auto;
  height:8px;
  background-image:
    repeating-linear-gradient(to right,rgba(30,122,107,.55) 0 1px,transparent 1px 6px),
    repeating-linear-gradient(to right,rgba(30,122,107,.85) 0 1px,transparent 1px 24px);
}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:46px;
  padding:12px 20px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1.2;
  color:var(--c-green-deep);
  background:transparent;
  border:1px solid var(--c-green);
  transition:background-color .18s var(--ease-out),color .18s var(--ease-out),border-color .18s var(--ease-out),transform .18s var(--ease-out);
}
.btn:hover{background:var(--c-green);border-color:var(--c-green);color:var(--c-paper)}
.btn--primary{background:var(--c-orange);border-color:var(--c-orange);color:var(--c-ink)}
.btn--primary:hover{background:var(--c-orange-deep);border-color:var(--c-orange-deep);color:var(--c-paper)}
.btn--ghost{border-color:var(--c-ink);color:var(--c-ink)}
.btn--ghost:hover{background:var(--c-ink);border-color:var(--c-ink);color:var(--c-paper)}
.btn--sm{min-height:38px;padding:9px 14px;font-size:13px}
.btn--block{display:flex;width:100%}
.btn__meta{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;opacity:.72}

/* ---------- 7. 页面标题带 / 面包屑 / 章节 ---------- */
.page-head{padding:44px 0 28px;border-bottom:var(--hair-green)}
.page-head__coord{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--c-green-deep);
}
.page-head__title{
  margin-top:12px;
  font-size:clamp(30px,5vw,52px);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.08;
}
.page-head__lede{margin-top:16px;font-size:17px;line-height:1.75;color:var(--c-ink-mid);max-width:38em}

.crumbs{margin-top:18px}
.crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--c-ink-mid)}
.crumbs__item{display:flex;align-items:center;gap:8px}
.crumbs__link{color:var(--c-green-deep);border-bottom:1px solid transparent;transition:border-color .18s var(--ease-out),color .15s ease}
.crumbs__link:hover{border-bottom-color:var(--c-orange)}
.crumbs__sep{color:rgba(91,110,120,.7)}
.crumbs__current{color:var(--c-ink-mid)}

.section{padding:48px 0;border-bottom:1px solid rgba(38,51,59,.1)}
.section:last-child{border-bottom:0}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px 16px;
  margin-bottom:24px;
  padding-top:14px;
  border-top:1px solid var(--c-green);
}
.section__index{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--c-orange-deep)}
.section__title{font-size:clamp(22px,3vw,32px)}
.section__note{margin-left:auto;font-size:13px;color:var(--c-ink-mid)}

/* ---------- 8. 章节索引栏 ---------- */
.index-rail{min-width:0}
.index-rail__list{display:flex;gap:8px;overflow-x:auto;padding-bottom:6px}
.index-rail__item{flex:0 0 auto}
.index-rail__link{
  display:block;
  min-height:40px;
  padding:9px 12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  white-space:nowrap;
  color:var(--c-ink-mid);
  background:var(--c-paper);
  border:1px solid rgba(38,51,59,.18);
  transition:color .15s ease,border-color .18s var(--ease-out),background-color .18s var(--ease-out);
}
.index-rail__link:hover{color:var(--c-green-deep);border-color:var(--c-green)}
.index-rail__link.is-active{color:var(--c-paper);background:var(--c-green);border-color:var(--c-green)}
@media (min-width:1024px){
  .index-rail{position:sticky;top:104px;align-self:start}
  .index-rail__list{flex-direction:column;gap:0;overflow:visible;padding-bottom:0;border-left:1px solid rgba(38,51,59,.18)}
  .index-rail__item{flex:0 0 auto}
  .index-rail__link{
    margin-left:-1px;
    padding:10px 12px;
    background:transparent;
    border:0;
    border-left:2px solid transparent;
  }
  .index-rail__link:hover{background:var(--c-green-mist);border-left-color:var(--c-green)}
  .index-rail__link.is-active{background:var(--c-green-mist);border-left-color:var(--c-orange);color:var(--c-green-deep)}
}

/* ---------- 9. 面板 / 卡片 ---------- */
.panel{
  position:relative;
  padding:32px 20px 22px;
  background:var(--c-paper);
  border:1px solid var(--c-ink);
  transition:border-color .18s var(--ease-out),transform .18s var(--ease-out),background-color .18s var(--ease-out);
}
.panel:hover{border-color:var(--c-orange);transform:translateY(-2px)}
.panel__index{
  position:absolute;
  top:0;left:0;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  line-height:1.5;
  background:var(--c-green);
  color:var(--c-paper);
}
.panel__title{font-size:20px;font-weight:900;letter-spacing:-.01em;line-height:1.3}
.panel__body{margin-top:10px;font-size:15.5px;line-height:1.75;color:var(--c-ink-mid)}
.panel--tint{background:var(--c-green-mist);border-color:var(--c-green)}
.panel--accent{background:var(--c-orange-mist);border-color:var(--c-orange)}
.panel--accent .panel__index{background:var(--c-orange);color:var(--c-ink)}
.panel--flat:hover{transform:none;border-color:var(--c-ink)}

/* ---------- 10. 提示条 / 标签 ---------- */
.note{
  padding:14px 18px;
  font-size:15px;
  line-height:1.7;
  background:var(--c-orange-mist);
  border-left:3px solid var(--c-orange);
  color:var(--c-ink);
}
.note--green{background:var(--c-green-mist);border-left-color:var(--c-green)}
.note__label{
  display:block;
  margin-bottom:6px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--c-orange-deep);
}
.note--green .note__label{color:var(--c-green-deep)}

.tag{
  display:inline-flex;
  align-items:center;
  padding:4px 9px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  line-height:1.5;
  color:var(--c-green-deep);
  background:var(--c-paper);
  border:1px solid var(--c-green);
}
.tag--active{background:var(--c-orange);border-color:var(--c-orange);color:var(--c-ink)}
.tag--data{border-color:var(--c-amber);color:#8A5A10}

/* ---------- 11. 键值清单 / 表格 ---------- */
.kv-list{border-top:var(--hair)}
.kv-list__row{
  display:grid;
  grid-template-columns:minmax(90px,34%) minmax(0,1fr);
  gap:16px;
  padding:11px 12px;
  border-bottom:var(--hair);
  font-size:15px;
  transition:background-color .18s var(--ease-out);
}
.kv-list__row:hover{background:var(--c-green-mist)}
.kv-list__key{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--c-ink-mid)}
.kv-list__val{min-width:0}

.table-wrap{overflow-x:auto;border:1px solid var(--c-ink)}
.data-table{width:100%;min-width:520px;font-size:15px}
.data-table thead th{
  padding:11px 14px;
  text-align:left;
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--c-paper);
  background:var(--c-green-deep);
  white-space:nowrap;
}
.data-table tbody td{padding:11px 14px;border-bottom:var(--hair)}
.data-table tbody tr:nth-child(even){background:var(--c-green-mist)}
.data-table tbody tr:hover{outline:1px solid var(--c-orange);outline-offset:-1px}

/* ---------- 12. 折叠模块 ---------- */
.fold{border:1px solid var(--c-ink);border-top:0;background:var(--c-paper)}
.fold:first-of-type{border-top:1px solid var(--c-ink)}
.fold__summary{
  display:flex;
  align-items:center;
  gap:12px;
  min-height:50px;
  padding:15px 18px;
  font-size:16px;
  font-weight:700;
  line-height:1.4;
  cursor:pointer;
  transition:background-color .18s var(--ease-out),color .18s var(--ease-out);
}
.fold__summary::before{
  content:"";
  flex:none;
  width:10px;height:10px;
  background:var(--c-paper);
  border:1px solid var(--c-green);
  transition:background-color .15s ease,transform .15s ease;
}
.fold__summary:hover{background:var(--c-green-mist)}
.fold[open]>.fold__summary{background:var(--c-green-deep);color:var(--c-paper)}
.fold[open]>.fold__summary::before{background:var(--c-orange);border-color:var(--c-orange);transform:rotate(45deg)}
.fold__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--c-orange-deep)}
.fold[open]>.fold__summary .fold__num{color:var(--c-orange)}
.fold__body{padding:16px 18px 20px;font-size:15.5px;line-height:1.75;color:var(--c-ink-mid);border-top:var(--hair)}
.fold__body p+p{margin-top:1em}

/* ---------- 13. 统计 / 图片容器 ---------- */
.stat{padding:18px 0 16px;border-top:2px solid var(--c-green)}
.stat__value{display:block;font-family:var(--font-mono);font-size:clamp(24px,3.2vw,36px);font-weight:700;line-height:1.05;letter-spacing:.02em;color:var(--c-green-deep)}
.stat__label{display:block;margin-top:8px;font-size:13px;line-height:1.6;color:var(--c-ink-mid)}

.media{display:block;min-width:0}
.media__frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--c-ink);
  aspect-ratio:16/10;
  background:
    linear-gradient(135deg,rgba(30,122,107,.16),rgba(247,250,249,0) 62%),
    var(--c-green-mist);
}
.media__img{width:100%;height:100%;object-fit:cover}
.media__badge{
  position:absolute;
  top:0;left:0;
  z-index:2;
  padding:4px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  line-height:1.5;
  background:var(--c-orange);
  color:var(--c-ink);
}
.media__caption{margin-top:10px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;line-height:1.6;color:var(--c-ink-mid)}
.media--wide .media__frame{aspect-ratio:21/9}
.media--tall .media__frame{aspect-ratio:3/4}
.media--blueprint .media__frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  opacity:.75;
  background-image:
    linear-gradient(to right,rgba(38,51,59,.14) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(38,51,59,.14) 1px,transparent 1px);
  background-size:48px 48px;
}
.media-grid{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

/* ---------- 14. 内容显现 ---------- */
[data-reveal].is-pending{opacity:0;transform:translateY(12px)}
[data-reveal].is-visible{opacity:1;transform:none;transition:opacity .45s var(--ease-out),transform .45s var(--ease-out)}

/* ---------- 15. 页脚 ---------- */
.site-footer{
  margin-top:64px;
  background:var(--c-green-deep);
  color:var(--c-paper);
  border-top:1px solid var(--c-green);
}
.texture-band{
  height:64px;
  background-color:#0F4239;
  background-image:
    radial-gradient(140% 120% at 8% 132%,rgba(30,122,107,.95) 0%,rgba(30,122,107,0) 62%),
    radial-gradient(120% 100% at 46% 148%,rgba(30,122,107,.75) 0%,rgba(30,122,107,0) 58%),
    radial-gradient(150% 110% at 92% 136%,rgba(30,122,107,.85) 0%,rgba(30,122,107,0) 60%),
    repeating-linear-gradient(90deg,rgba(247,250,249,.07) 0 1px,transparent 1px 40px);
  border-bottom:1px solid rgba(247,250,249,.12);
}
.footer-inner{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
.footer-main{padding:48px 0 40px}
.footer-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:36px}
@media (min-width:900px){
  .footer-grid{grid-template-columns:minmax(0,1.15fr) minmax(0,2.5fr);gap:48px}
}
.footer-brand{min-width:0}
.brand--footer .brand__mark{background:var(--c-orange);border-color:var(--c-orange);color:var(--c-ink)}
.brand--footer .brand__name{color:var(--c-paper)}
.brand--footer .brand__tagline{color:rgba(247,250,249,.66);white-space:normal}
.footer-brand__desc{margin-top:14px;max-width:30em;font-size:13px;line-height:1.7;color:rgba(247,250,249,.76)}
.footer-brand__coord{margin-top:14px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;line-height:1.6;color:rgba(247,250,249,.58)}
.footer-nav{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:28px 24px;min-width:0}
.footer-col{min-width:0}
.footer-col__title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
  padding-bottom:10px;
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--c-paper);
  border-bottom:1px solid rgba(247,250,249,.28);
}
.footer-col__title::before{content:"";flex:none;width:6px;height:6px;background:var(--c-orange)}
.footer-links{display:flex;flex-direction:column;gap:2px}
.footer-link{
  position:relative;
  display:inline-block;
  padding:6px 0;
  font-size:13px;
  line-height:1.6;
  color:rgba(247,250,249,.82);
  transition:color .15s ease;
}
.footer-link::after{
  content:"";
  position:absolute;
  left:0;bottom:4px;
  width:0;height:1px;
  background:var(--c-orange);
  transition:width .18s var(--ease-out);
}
.footer-link:hover{color:var(--c-paper)}
.footer-link:hover::after{width:100%}
.footer-meta{border-top:1px solid rgba(247,250,249,.22);background:rgba(0,0,0,.16);padding:24px 0 32px}
.footer-meta__inner{display:flex;flex-direction:column;gap:10px}
.footer-contact{max-width:none;font-size:13px;line-height:1.6;color:rgba(247,250,249,.82);word-break:break-word}
.footer-note{max-width:none;font-size:12.5px;line-height:1.6;color:rgba(247,250,249,.62)}
.footer-meta__row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;padding-top:6px}
.footer-legal{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:rgba(247,250,249,.72)}
.footer-copy{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:rgba(247,250,249,.58)}
.footer-texture-note{font-size:11.5px;line-height:1.6;color:rgba(247,250,249,.42)}

/* ---------- 16. 断点 ---------- */
@media (max-width:1240px){
  .version-badge{display:none}
}
@media (max-width:1100px){
  .site-nav__link{padding:9px 9px;font-size:12.5px}
}
@media (max-width:1024px){
  .nav-cta{display:none}
}
@media (max-width:900px){
  .header-band__inner{
    grid-template-columns:minmax(0,1fr) auto;
    gap:12px;
    min-height:60px;
  }
  .nav-toggle{display:inline-flex}
  .header-actions{grid-column:2}
  .site-nav{
    position:absolute;
    top:100%;left:0;right:0;
    z-index:90;
    display:none;
    max-height:calc(100vh - 80px);
    overflow-y:auto;
    padding:8px 12px 14px;
    background:var(--c-green);
    border-top:1px solid var(--c-green-deep);
    border-bottom:2px solid var(--c-green-deep);
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;gap:0;justify-content:flex-start}
  .site-nav__link{
    display:flex;
    width:100%;
    min-height:48px;
    padding:13px 12px;
    font-size:15px;
    letter-spacing:.06em;
    color:var(--c-paper);
    border:0;
    border-bottom:1px solid rgba(247,250,249,.18);
    background:transparent;
  }
  .site-nav__link:hover{background:rgba(247,250,249,.1);border-color:rgba(247,250,249,.18);color:var(--c-paper)}
  .site-nav__link[aria-current="page"]{background:var(--c-paper);color:var(--c-green-deep);border-color:transparent}
  .header-coord{display:none}
}
@media (max-width:640px){
  :root{--gutter:16px}
  body{font-size:16px;background-size:64px 64px}
  p{max-width:none}
  .brand__tagline{display:none}
  .brand__mark{width:30px;height:30px;font-size:14px}
  .brand__name{font-size:17px}
  .section{padding:36px 0}
  .section__note{margin-left:0;width:100%}
  .panel{padding:30px 16px 20px}
  .footer-main{padding:36px 0 30px}
  .texture-band{height:48px}
  .kv-list__row{grid-template-columns:minmax(0,1fr);gap:4px}
}

/* ---------- 17. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    transition-duration:.01ms !important;
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
  }
  .panel:hover{transform:none}
  [data-reveal].is-pending{opacity:1;transform:none}
  .scroll-progress__bar{transition:none}
  .skip-link{transition:none}
}