/* ============================================================
   微乐官网 · 共享样式表 /assets/site.css
   极简文字建筑 + 连续画布 + 一处暖色锚点
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --paper:#FAF5EF;
  --ink:#14110F;
  --deep:#0F3D33;
  --orange:#FF7A2F;
  --coral:#F2455C;
  --blue:#1F63FF;
  --sand:#E4C08A;
  --mist:#FFE4D9;
  --sage:#5C6B63;
  --mint:#E8EFEA;
  --coral-deep:#C9354C;

  --warm:linear-gradient(115deg,#FF7A2F 0%,#F2455C 100%);
  --warm-soft:linear-gradient(140deg,#FFE4D9 0%,#E8EFEA 100%);

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --page:1180px;
  --prose:720px;
  --gutter:clamp(20px,4.4vw,56px);

  --r-sm:10px;
  --r-md:18px;
  --r-lg:26px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:180ms;
  --dur-lg:280ms;
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  overflow-x:clip;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:clamp(16px,1.02vw,17px);
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
input,textarea,select{font:inherit;color:inherit}
hr{border:0;height:1px;background:var(--sand);margin:0}
::selection{background:var(--mist);color:var(--ink)}

/* ---------- 3. 焦点与可访问性 ---------- */
:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:4px}
.sr-only{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
.skip-link{
  position:absolute;left:50%;top:10px;z-index:200;
  transform:translate(-50%,-180%);
  background:var(--ink);color:var(--paper);
  padding:.6em 1.1em;border-radius:999px;
  font-size:.85rem;font-weight:700;letter-spacing:.04em;
  transition:transform 160ms var(--ease);
}
.skip-link:focus-visible{transform:translate(-50%,0);outline-offset:3px}

/* ---------- 4. 排版基元 ---------- */
.display{font-size:clamp(2.8rem,6.4vw,5.6rem);font-weight:900;line-height:1.08;letter-spacing:-.04em}
.h1{font-size:clamp(2.1rem,4.6vw,3.5rem);font-weight:900;line-height:1.1;letter-spacing:-.03em}
.h2{font-size:clamp(1.4rem,2.4vw,2.2rem);font-weight:900;line-height:1.15;letter-spacing:-.02em}
.h3{font-size:clamp(1.08rem,1.5vw,1.32rem);font-weight:700;line-height:1.35;letter-spacing:-.01em}
.lead{font-size:clamp(1.05rem,1.55vw,1.28rem);line-height:1.7;color:var(--sage);font-weight:400}
.mono{font-family:var(--font-mono);font-size:.92em;font-weight:500;letter-spacing:.02em;font-feature-settings:"tnum" 1}
.label{font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.14em;color:var(--sage);text-transform:uppercase}
.eyebrow{font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.14em;color:var(--coral-deep)}
.rule{height:1px;background:var(--sand);border:0}
.rule--soft{background:rgba(228,192,138,.5)}
.note{
  border-left:2px solid var(--sand);
  padding:2px 0 2px 16px;
  color:var(--sage);
  font-size:.92rem;
  line-height:1.7;
}

/* ---------- 5. 布局容器 ---------- */
.container{width:100%;max-width:var(--page);margin-inline:auto;padding-inline:var(--gutter)}
.container--prose{max-width:calc(var(--prose) + var(--gutter) * 2)}
.prose{max-width:var(--prose)}
.prose > * + *{margin-top:1.15em}
.prose h2{font-size:clamp(1.4rem,2.4vw,2.2rem);font-weight:900;line-height:1.15;letter-spacing:-.02em;margin-top:2.2em}
.prose h3{font-size:clamp(1.08rem,1.5vw,1.32rem);font-weight:700;line-height:1.35;margin-top:1.8em}
.prose a{color:var(--deep);border-bottom:1.5px solid var(--sand);transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease)}
.prose a:hover{border-color:var(--blue);color:var(--blue)}
.prose ul,.prose ol{padding-left:1.3em;list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.5em}
.prose li::marker{color:var(--orange)}
.prose blockquote{border-left:3px solid var(--orange);padding-left:1.1em;color:var(--sage)}
.prose code{font-family:var(--font-mono);font-size:.9em;background:var(--mint);padding:.12em .42em;border-radius:6px;color:var(--deep)}
.prose img{border-radius:var(--r-md)}

.section{padding-block:clamp(56px,8vw,110px)}
.section--tight{padding-block:clamp(34px,5vw,64px)}
.section--deep{background:var(--deep);color:var(--paper)}
.section--deep .lead,.section--deep .note{color:rgba(250,245,239,.78)}
.section--mist{background:linear-gradient(180deg,var(--mist) 0%,rgba(255,228,217,0) 100%)}
.sectionhead{display:grid;gap:14px;max-width:760px}
.sectionhead__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--orange);font-weight:500}
.sectionhead__title{font-size:clamp(1.4rem,2.4vw,2.2rem);font-weight:900;line-height:1.15;letter-spacing:-.02em}
.sectionhead__text{color:var(--sage);max-width:62ch}

/* ---------- 6. 按钮与标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.72em 1.35em;border-radius:999px;border:1.5px solid transparent;
  font-size:.95rem;font-weight:700;line-height:1.1;letter-spacing:.01em;
  cursor:pointer;
  transition:transform var(--dur) var(--ease),background-color var(--dur) var(--ease),
             color var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.btn--primary{background:var(--warm);color:#fff;box-shadow:0 10px 26px -16px rgba(242,69,92,.95)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px -16px rgba(242,69,92,1)}
.btn--ghost{border-color:var(--ink);color:var(--ink)}
.btn--ghost:hover{background:var(--ink);color:var(--paper);transform:translateY(-2px)}
.btn--ink{background:var(--deep);color:var(--paper)}
.btn--ink:hover{background:#0b2f28;transform:translateY(-2px)}
.btn--link{padding:.2em 0;border-radius:0;border-bottom:1.5px solid var(--sand);color:var(--deep)}
.btn--link:hover{border-color:var(--blue);color:var(--blue)}
.btn--sm{font-size:.82rem;padding:.55em 1em}

.tag{
  display:inline-flex;align-items:center;gap:.42em;
  font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.1em;
  padding:.32em .72em;border-radius:999px;
  background:var(--mint);color:var(--deep);
}
.tag--beta{background:rgba(242,69,92,.12);color:var(--coral-deep)}
.tag--live{background:rgba(31,99,255,.1);color:var(--blue)}

/* ---------- 7. 面包屑 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--sage);
}
.crumbs a{color:var(--deep);border-bottom:1px solid transparent;transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease)}
.crumbs a:hover{border-color:var(--sand);color:var(--coral-deep)}
.crumbs__sep{color:var(--sand)}

/* ---------- 8. 网格 ---------- */
.grid{display:grid;gap:clamp(18px,2.6vw,32px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}

/* ---------- 9. 图片 / 图形容器 ---------- */
.figure{margin:0;display:grid;gap:12px}
.figure__frame{
  position:relative;overflow:hidden;border-radius:var(--r-lg);
  background:var(--warm-soft);
  aspect-ratio:16/9;
  isolation:isolate;
}
.figure__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(120% 90% at 12% 8%,rgba(255,122,47,.35),transparent 62%),
             radial-gradient(90% 80% at 92% 96%,rgba(31,99,255,.16),transparent 60%);
}
.figure__frame img{width:100%;height:100%;object-fit:cover}
.figure__frame--wide{aspect-ratio:21/9}
.figure__frame--tall{aspect-ratio:3/4}
.figure__frame--square{aspect-ratio:1/1}
.figure__caption{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--sage)}

/* ---------- 10. 刊头导航 ---------- */
.masthead{
  position:sticky;top:0;z-index:80;
  background:rgba(250,245,239,.92);
  -webkit-backdrop-filter:saturate(150%) blur(12px);
  backdrop-filter:saturate(150%) blur(12px);
  border-bottom:1px solid var(--sand);
}
.masthead__frame{
  position:relative;
  max-width:var(--page);margin-inline:auto;
  padding:clamp(10px,1.5vw,18px) var(--gutter) clamp(6px,1vw,10px);
}
.masthead__topline{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;
  min-height:clamp(46px,4.6vw,62px);
}
.masthead__cta{justify-self:start}
.masthead__plate{grid-column:2;text-align:center}
.masthead__brand{
  display:inline-block;
  font-size:clamp(2rem,4.4vw,3.2rem);font-weight:900;letter-spacing:-.06em;line-height:1;
  color:var(--ink);
  transition:font-size 220ms var(--ease),color var(--dur) var(--ease);
}
.masthead__brand::after{
  content:"";display:inline-block;
  width:.15em;height:.15em;margin-left:.16em;border-radius:50%;
  background:var(--warm);
  transform:translateY(-.62em);
}
.masthead__brand:hover{color:var(--deep)}
.masthead__signal{
  margin-top:.4em;
  font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.2em;
  color:var(--sage);
}
.masthead__tools{justify-self:end;display:flex;align-items:center;gap:8px}

.iconbtn{
  display:inline-flex;align-items:center;gap:.55em;
  padding:.5em .85em;border:1px solid var(--sand);border-radius:999px;
  background:rgba(255,228,217,.55);color:var(--deep);
  font-size:.78rem;font-weight:700;letter-spacing:.06em;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.iconbtn:hover{background:var(--mist);border-color:var(--orange);transform:translateY(-2px)}
.iconbtn__mark{
  position:relative;width:14px;height:10px;
  border-top:1.5px solid currentColor;border-bottom:1.5px solid currentColor;
}
.iconbtn__mark::after{
  content:"";position:absolute;left:0;right:3px;top:50%;
  border-top:1.5px solid currentColor;
}
.iconbtn__text{white-space:nowrap}

.navtoggle{
  display:none;align-items:center;gap:.4em;
  padding:.5em .85em;border:1px solid var(--ink);border-radius:999px;
  font-size:.78rem;font-weight:700;letter-spacing:.06em;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.navtoggle:hover{background:var(--ink);color:var(--paper)}
.navtoggle__close{display:none}
.masthead[data-open="true"] .navtoggle__open{display:none}
.masthead[data-open="true"] .navtoggle__close{display:inline}
.masthead[data-open="true"] .navtoggle{background:var(--deep);border-color:var(--deep);color:var(--paper)}

.masthead__nav{margin-top:clamp(8px,1.2vw,16px);border-top:1px solid var(--sand)}
.navlist{
  display:flex;justify-content:center;align-items:center;flex-wrap:wrap;
  padding:clamp(6px,1vw,12px) 0;
}
.navlist__item{display:flex;align-items:center}
.navlist__item + .navlist__item::before{
  content:"";width:1px;height:12px;background:var(--sand);
  margin:0 clamp(10px,2vw,26px);
}
.navlist__link{
  position:relative;display:inline-block;
  padding:.35em .1em;
  font-size:clamp(.95rem,1.12vw,1.05rem);font-weight:700;letter-spacing:.01em;color:var(--ink);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.navlist__link::after{
  content:"";position:absolute;left:0;right:0;bottom:.12em;height:2px;
  background:var(--sand);
  transform:scaleX(0);transform-origin:left;
  transition:transform 220ms var(--ease),background var(--dur) var(--ease);
}
.navlist__link:hover{color:var(--deep);transform:translateY(-2px)}
.navlist__link:hover::after{transform:scaleX(1)}
.navlist__link[aria-current="page"]{color:var(--deep)}
.navlist__link[aria-current="page"]::after{transform:scaleX(1);background:var(--warm)}

.masthead__navfoot{display:none}
.masthead__navnote{font-size:.85rem;color:var(--sage)}

.masthead[data-collapsed="true"] .masthead__frame{padding-top:6px;padding-bottom:4px}
.masthead[data-collapsed="true"] .masthead__brand{font-size:clamp(1.3rem,2.2vw,1.7rem)}
.masthead[data-collapsed="true"] .masthead__signal{display:none}
.masthead[data-collapsed="true"] .masthead__nav{margin-top:4px}
.masthead[data-collapsed="true"] .navlist{padding-block:5px}
.masthead[data-collapsed="true"] .masthead__cta{font-size:.76rem;padding:.42em .85em}

.progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:linear-gradient(90deg,var(--orange),var(--coral) 55%,var(--blue));
  transform:scaleX(0);transform-origin:left;
  transition:transform 120ms linear;
  pointer-events:none;
}

/* ---------- 11. 侧边章节索引 ---------- */
.sidemenu{
  position:fixed;top:0;right:0;bottom:0;z-index:120;
  width:min(380px,88vw);
  display:flex;flex-direction:column;
  padding:clamp(20px,4vw,30px);
  background:var(--deep);color:var(--paper);
  overflow-y:auto;
  transform:translateX(102%);
  visibility:hidden;
  box-shadow:-30px 0 60px -40px rgba(20,17,15,.8);
  transition:transform var(--dur-lg) var(--ease),visibility var(--dur-lg) var(--ease);
}
.sidemenu[data-open="true"]{transform:none;visibility:visible}
.sidemenu__head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-bottom:14px;border-bottom:1px solid rgba(228,192,138,.35);
}
.sidemenu__eyebrow{
  font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.18em;
  color:var(--sand);
}
.sidemenu__close{
  padding:.4em .9em;border:1px solid rgba(250,245,239,.4);border-radius:999px;
  font-size:.78rem;font-weight:700;letter-spacing:.06em;color:var(--paper);
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.sidemenu__close:hover{background:rgba(250,245,239,.14);border-color:var(--sand)}
.sidemenu__list{display:grid;gap:2px;margin-top:18px}
.sidemenu__item{list-style:none}
.sidemenu__link{
  display:flex;align-items:baseline;gap:14px;
  padding:12px 10px;border-radius:var(--r-sm);
  font-size:.98rem;font-weight:700;color:rgba(250,245,239,.78);
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.sidemenu__link::before{
  counter-increment:idx;
  content:counter(idx,decimal-leading-zero);
  font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.12em;
  color:var(--sand);
}
.sidemenu__list{counter-reset:idx}
.sidemenu__link:hover{background:rgba(250,245,239,.08);color:#fff;transform:translateX(4px)}
.sidemenu__link.is-current{
  color:#fff;
  background:linear-gradient(90deg,rgba(255,122,47,.3),rgba(242,69,92,.12));
}
.sidemenu__link.is-current::before{color:var(--orange)}
.sidemenu__empty{margin-top:18px;color:rgba(250,245,239,.6);font-size:.9rem}

/* ---------- 12. 页脚 ---------- */
.sitefoot{
  position:relative;
  margin-top:clamp(64px,9vw,120px);
  background:var(--deep);color:var(--paper);
  overflow:hidden;
}
.sitefoot::before{
  content:"";position:absolute;inset:auto -10% -40% auto;
  width:min(620px,72vw);aspect-ratio:1/1;border-radius:50%;
  background:radial-gradient(circle at 50% 50%,rgba(255,122,47,.28),transparent 66%);
  pointer-events:none;
}
.sitefoot__inner{
  position:relative;
  max-width:var(--page);margin-inline:auto;
  padding:clamp(48px,7vw,88px) var(--gutter) 28px;
}
.sitefoot__top{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,2fr);
  gap:clamp(30px,5vw,72px);
}
.sitefoot__brand{font-size:clamp(2rem,4vw,3rem);font-weight:900;letter-spacing:-.05em;line-height:1}
.sitefoot__tag{margin-top:14px;max-width:32ch;color:rgba(250,245,239,.76)}
.sitefoot__meta{margin-top:16px;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--sand)}
.sitefoot__cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,40px)}
.sitefoot__coltitle{
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.16em;
  color:var(--sand);
}
.sitefoot__links li{margin-bottom:2px}
.sitefoot__links a{
  position:relative;display:inline-block;padding:5px 0;
  color:rgba(250,245,239,.82);font-weight:500;
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.sitefoot__links a::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:1px;background:var(--sand);
  transform:scaleX(0);transform-origin:left;transition:transform 220ms var(--ease);
}
.sitefoot__links a:hover{color:#fff;transform:translateX(2px)}
.sitefoot__links a:hover::after{transform:scaleX(1)}

.sitefoot__jumps{
  display:flex;flex-wrap:wrap;gap:10px;
  margin-top:clamp(32px,4.5vw,56px);
  padding-top:clamp(24px,3.5vw,40px);
  border-top:1px solid rgba(228,192,138,.3);
}
.sitefoot__jump{
  padding:.5em 1em;border:1px solid rgba(228,192,138,.42);border-radius:999px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:rgba(250,245,239,.86);
}

.sitefoot__contact{
  display:grid;gap:10px;
  margin-top:clamp(26px,3.5vw,40px);
}
.copyline{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;
  padding:12px 0;border-bottom:1px solid rgba(228,192,138,.22);
}
.copyline--plain{border-bottom:0}
.copyline__label{
  min-width:5em;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--sand);
}
.copyline__value{font-weight:700;color:var(--paper);word-break:break-all}
.copybtn{
  margin-left:auto;
  padding:.38em .9em;border:1px solid rgba(228,192,138,.5);border-radius:999px;
  font-size:.76rem;font-weight:700;letter-spacing:.06em;color:var(--paper);
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.copybtn:hover{background:var(--mist);color:var(--deep);border-color:var(--mist)}
.copybtn.is-done{background:var(--warm);color:#fff;border-color:transparent}
.sitefoot__service{
  margin-top:20px;max-width:66ch;
  font-size:.86rem;color:rgba(250,245,239,.64);
}
.sitefoot__base{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 26px;
  margin-top:clamp(26px,3.5vw,40px);padding-top:22px;
  border-top:1px solid rgba(228,192,138,.35);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:rgba(250,245,239,.62);
}
.sitefoot__baseitem{font-size:12px}

/* ---------- 13. 显现动效 ---------- */
html.js [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity 320ms var(--ease),transform 320ms var(--ease);
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 14. 断点 ---------- */
@media (max-width:1000px){
  .sitefoot__top{grid-template-columns:1fr}
  .sitefoot__cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:860px){
  .masthead{position:sticky}
  .masthead__cta{display:none}
  .navtoggle{display:inline-flex}
  .masthead__nav{display:none}
  .masthead[data-open="true"] .masthead__nav{
    display:block;
    margin-inline:calc(var(--gutter) * -1);
    margin-bottom:calc(clamp(6px,1vw,10px) * -1);
    padding:0 var(--gutter) 6px;
    background:var(--paper);
    border-bottom:1px solid var(--sand);
    max-height:calc(100vh - 120px);
    overflow-y:auto;
    animation:navIn 200ms var(--ease) both;
  }
  .navlist{counter-reset:nav;flex-direction:column;align-items:stretch;padding:8px 0 4px}
  .navlist__item + .navlist__item::before{display:none}
  .navlist__item{border-bottom:1px solid var(--sand)}
  .navlist__item:last-child{border-bottom:0}
  .navlist__link{
    display:flex;align-items:baseline;gap:16px;
    padding:15px 4px;font-size:1.35rem;font-weight:900;letter-spacing:-.02em;
  }
  .navlist__link::before{
    counter-increment:nav;
    content:counter(nav,decimal-leading-zero);
    font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.14em;
    color:var(--orange);
  }
  .navlist__link::after{bottom:8px}
  .navlist__link:hover{transform:none}
  .masthead__navfoot{display:grid;gap:14px;padding:18px 0 22px;border-top:1px solid var(--sand)}
  .masthead[data-collapsed="true"] .navlist__link{font-size:1.35rem;font-weight:900}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3{grid-column:span 3}
  .col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:span 6}
  .sitefoot__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .sitefoot__base{justify-content:flex-start;gap:8px 20px}
}
@media (max-width:560px){
  .grid--12{grid-template-columns:1fr}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:1/-1}
  .sitefoot__cols{grid-template-columns:1fr}
  .masthead__brand{font-size:1.9rem}
  .masthead__signal{letter-spacing:.14em;font-size:10px}
  .iconbtn__text{display:none}
  .iconbtn{padding:.5em .7em}
  .copyline{flex-direction:column;align-items:flex-start;gap:6px}
  .copybtn{margin-left:0}
}

@keyframes navIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

/* ---------- 15. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .navlist__link:hover,.btn:hover,.iconbtn:hover,.sidemenu__link:hover,.sitefoot__links a:hover{transform:none}
  .progress{transition:none}
}