/* ============================================================
   江南体育 · 共享样式 /assets/site.css
   水岸看台 × 印刷档案：月白纸面 / 黛蓝墨色 / 水纹负空间
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --paper:#F4F1EA;
  --paper-2:#EDE6D8;
  --paper-3:#E2DAC8;
  --ink:#141C1E;
  --ink-2:#1F3A44;
  --muted:#6B7B7A;
  --stone:#3E6B6A;
  --tide:#7FA8A6;
  --line:#CDC4B0;
  --line-2:rgba(31,58,68,.14);
  --seal:#C2453A;
  --seal-deep:#A9372D;
  --brass:#C9A227;
  --amber:#E6A817;
  --crimson:#D7263D;

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

  --header-h:74px;
  --radius:3px;
  --maxw:1240px;
  --maxw-wide:1480px;
  --maxw-text:800px;
  --shadow:0 18px 36px -30px rgba(20,28,30,.55), 0 1px 0 rgba(20,28,30,.05);
  --shadow-lift:0 28px 52px -32px rgba(20,28,30,.62);
  --ease:cubic-bezier(.2,.72,.28,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%; scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0}
img,svg,video{max-width:100%;height:auto;display:block}
button,input,select,textarea{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--seal);outline-offset:3px;border-radius:2px}
.site-header.is-solid :focus-visible,
.site-footer :focus-visible{outline-color:var(--brass)}

/* ---------- 3. 基础排版（文—数双轨） ---------- */
body{
  min-height:100vh;
  background-color:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
h1,h2,h3,h4,.font-display{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.18;
  color:var(--ink-2);
  letter-spacing:.01em;
}
h1{font-size:clamp(2.05rem,5.2vw,3.8rem)}
h2{font-size:clamp(1.55rem,3.1vw,2.45rem)}
h3{font-size:clamp(1.18rem,2vw,1.5rem)}
h4{font-size:1.05rem}
p{text-wrap:pretty}
a{color:inherit;text-decoration:none}
.mono,.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}
.lede{
  max-width:60ch;
  font-size:clamp(1.04rem,1.6vw,1.2rem);
  line-height:1.85;
  color:#3B4847;
}

/* ---------- 4. 布局容器与网格 ---------- */
.container{width:min(100% - 2.5rem,var(--maxw));margin-inline:auto}
.container--wide{width:min(100% - 2rem,var(--maxw-wide))}
.container--narrow{width:min(100% - 2.5rem,var(--maxw-text))}

.section{position:relative;padding:clamp(3.4rem,7vw,6.2rem) 0}
.section--tight{padding:clamp(2rem,4vw,3.2rem) 0}
.section--tide{background:linear-gradient(180deg,rgba(127,168,166,.2),rgba(127,168,166,.02))}
.section--paper{background:var(--paper-2)}
.section--ink{background:var(--ink-2);color:rgba(244,241,234,.86)}
.section--ink h1,.section--ink h2,.section--ink h3,.section--ink h4{color:var(--paper)}
.section--ink .lede,.section--ink .muted{color:rgba(244,241,234,.72)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:1rem 2.4rem;
  margin-bottom:clamp(1.6rem,3vw,2.6rem);
}
.section-head__title{max-width:46ch}
.section-head__aside{font-size:.86rem;color:var(--muted);max-width:34ch}

.section__index{
  display:block;
  margin-bottom:.7rem;
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.4em;
  color:var(--brass);
  transition:color .4s var(--ease);
}
.section[data-section].is-active .section__index{color:var(--seal)}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--font-mono);
  font-size:.73rem;
  letter-spacing:.32em;
  text-transform:uppercase;
  color:var(--stone);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--brass);flex:0 0 auto}

.grid{display:grid;gap:clamp(1rem,2.2vw,1.8rem)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}

.split{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(1.4rem,3vw,3rem)}
@media (min-width:960px){
  .split{grid-template-columns:minmax(0,.86fr) minmax(0,1.14fr)}
  .split--even{grid-template-columns:repeat(2,minmax(0,1fr))}
  .split--reverse>*:first-child{order:2}
}

.divider-tide{
  height:1px;border:0;margin:clamp(2rem,4vw,3.4rem) 0;
  background:linear-gradient(90deg,transparent,var(--tide) 16%,var(--brass) 50%,var(--tide) 84%,transparent);
  opacity:.6;
}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.62rem 1.15rem;
  border:1px solid transparent;
  border-radius:var(--radius);
  background:none;
  font-family:var(--font-body);
  font-size:.86rem;
  font-weight:600;
  letter-spacing:.1em;
  line-height:1.4;
  cursor:pointer;
  transition:background-color .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);
}
.btn--seal{background:var(--seal);border-color:var(--seal);color:#F8EFEC}
.btn--seal:hover{background:var(--seal-deep);border-color:var(--seal-deep)}
.btn--brass{background:var(--brass);border-color:var(--brass);color:#241E04}
.btn--brass:hover{background:#B08F1E;border-color:#B08F1E}
.btn--ghost{border-color:currentColor;color:var(--ink-2)}
.btn--ghost:hover{background:var(--ink-2);color:var(--paper)}
.btn--paper{background:var(--paper);border-color:var(--paper);color:var(--ink-2)}
.btn--paper:hover{background:var(--paper-3);border-color:var(--paper-3)}
.btn--sm{padding:.42rem .8rem;font-size:.76rem;letter-spacing:.14em}
.btn--lg{padding:.86rem 1.7rem;font-size:.95rem}
.btn:active{transform:translateY(1px)}

/* ---------- 6. 页头（透明叠加 → 黛蓝实色） ---------- */
.skip-link{
  position:fixed;top:.5rem;left:.5rem;z-index:200;
  padding:.7rem 1rem;
  background:var(--ink-2);color:var(--paper);
  font-size:.85rem;letter-spacing:.1em;
  border-radius:var(--radius);
  transform:translateY(-170%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.site-header{
  --nav-fg:var(--ink-2);
  --nav-cur:var(--seal);
  --nav-bar:var(--seal);
  position:fixed;top:0;left:0;right:0;z-index:120;
  background-color:transparent;
  color:var(--nav-fg);
  transition:background-color .35s var(--ease),color .35s var(--ease),box-shadow .35s var(--ease);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(31,58,68,.3) 14%,rgba(31,58,68,.3) 86%,transparent);
  transition:opacity .3s var(--ease);
}
.site-header.is-solid{
  --nav-fg:rgba(244,241,234,.88);
  --nav-cur:#FFFFFF;
  --nav-bar:var(--brass);
  background-color:var(--ink-2);
  color:var(--paper);
  box-shadow:0 16px 36px -28px rgba(0,0,0,.92);
}
.site-header.is-solid::after{opacity:0}

.read-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:5;
  pointer-events:none;
  background:rgba(31,58,68,.12);
}
.read-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--brass),var(--seal));
  transition:transform .12s linear;
}

.site-header__inner{
  position:relative;z-index:1;
  width:min(100% - 2.5rem,var(--maxw-wide));
  margin-inline:auto;
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  gap:clamp(.7rem,2vw,2rem);
}

.brand{display:inline-flex;align-items:center;gap:.7rem;color:inherit;flex:0 0 auto}
.brand__seal{
  width:38px;height:38px;flex:0 0 auto;
  display:grid;place-items:center;
  background:var(--seal);color:#FBEDE9;
  font-family:var(--font-display);
  font-size:.8rem;font-weight:700;line-height:1;
  letter-spacing:.08em;
  writing-mode:vertical-rl;
  border-radius:2px;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.22);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-family:var(--font-display);font-size:1.14rem;font-weight:700;letter-spacing:.16em;color:currentColor}
.brand__tag{margin-top:3px;font-size:.6rem;letter-spacing:.2em;color:var(--muted)}
.site-header.is-solid .brand__tag{color:rgba(244,241,234,.58)}

.site-nav{flex:1 1 auto;display:flex;justify-content:center}
.site-nav__list{display:flex;align-items:center;gap:clamp(.4rem,1.5vw,1.5rem);list-style:none;margin:0;padding:0}
.site-nav__link{
  position:relative;display:inline-block;
  padding:.6rem .35rem;
  font-size:.9rem;letter-spacing:.1em;
  color:var(--nav-fg);
  transition:color .25s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:.35rem;right:.35rem;bottom:.3rem;height:2px;
  background:var(--nav-bar);
  transform:scaleX(0);transform-origin:left;
  transition:transform .3s var(--ease);
}
.site-nav__link:hover{color:var(--nav-cur)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--nav-cur);font-weight:600}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__tide{display:none}

.site-header__actions{display:flex;align-items:center;gap:.7rem;margin-left:auto;flex:0 0 auto}

.nav-toggle{
  display:none;align-items:center;gap:.55rem;
  padding:.42rem .7rem;
  background:none;border:1px solid currentColor;border-radius:var(--radius);
  color:inherit;font-size:.76rem;letter-spacing:.18em;cursor:pointer;
}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bar{display:block;height:1.5px;background:currentColor;transition:transform .25s var(--ease),opacity .2s linear}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,7vw,6rem);
  padding-top:clamp(2.6rem,5vw,4.2rem);
  background:var(--ink-2);
  color:rgba(244,241,234,.84);
}
.site-footer__tide{position:absolute;top:0;left:0;right:0;height:10px}
.site-footer__tide span{
  display:block;height:1px;margin-bottom:3px;
  background:linear-gradient(90deg,transparent,var(--tide) 20%,var(--brass) 50%,var(--tide) 80%,transparent);
  opacity:.5;
}
.site-footer__tide span:nth-child(2){height:2px;opacity:.3}
.site-footer__tide span:nth-child(3){opacity:.16}

.site-footer__inner{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(1.8rem,4vw,3rem);
  padding-bottom:clamp(2rem,4vw,3rem);
}
@media (min-width:880px){
  .site-footer__inner{grid-template-columns:minmax(0,1.02fr) minmax(0,1.6fr)}
}
.site-footer__brand{max-width:36ch}
.brand--footer .brand__name{color:var(--paper)}
.brand--footer .brand__tag{color:rgba(244,241,234,.52)}
.site-footer__note{margin-top:1.1rem;font-size:.9rem;line-height:1.8;color:rgba(244,241,234,.72)}
.site-footer__stamp{margin-top:.9rem;font-family:var(--font-mono);font-size:.76rem;letter-spacing:.1em;color:var(--brass)}

.site-footer__nav{
  display:grid;
  gap:clamp(1.4rem,3vw,2.4rem);
  grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
}
.footer-col__title{
  margin-bottom:.9rem;
  font-family:var(--font-mono);
  font-size:.76rem;font-weight:500;letter-spacing:.28em;
  color:var(--tide);
}
.footer-list{list-style:none;margin:0;padding:0;display:grid;gap:.55rem;font-size:.9rem;line-height:1.7}
.footer-list a{color:rgba(244,241,234,.8);border-bottom:1px solid transparent;transition:color .25s var(--ease),border-color .25s var(--ease)}
.footer-list a:hover{color:var(--paper);border-bottom-color:var(--brass)}
.footer-list--contact{font-family:var(--font-mono);font-size:.83rem;letter-spacing:.01em;gap:.5rem}
.footer-contact__value{color:rgba(244,241,234,.78);word-break:break-word}
.footer-list--inline{display:flex;flex-wrap:wrap;gap:.4rem 1.2rem;font-size:.8rem}
.footer-col__hint{margin-top:.9rem;font-size:.78rem;line-height:1.7;color:rgba(244,241,234,.55)}

.site-footer__base{border-top:1px solid rgba(244,241,234,.14);padding:1.1rem 0 1.6rem;font-size:.78rem;color:rgba(244,241,234,.6)}
.site-footer__base-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.6rem 1.6rem}
.site-footer__icp{font-family:var(--font-mono);letter-spacing:.06em}

/* ---------- 8. 通用组件 ---------- */
.breadcrumb{padding:1.1rem 0 .2rem;font-size:.82rem;color:var(--muted)}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:.5rem;list-style:none;margin:0;padding:0}
.breadcrumb__item{display:flex;align-items:center;gap:.5rem}
.breadcrumb__item+.breadcrumb__item::before{content:"／";color:var(--tide);font-family:var(--font-mono)}
.breadcrumb a:hover{color:var(--seal)}
.breadcrumb [aria-current="page"]{color:var(--ink-2);font-weight:600}

.card{
  position:relative;
  padding:clamp(1.1rem,2.2vw,1.6rem);
  background:var(--paper-2);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lift);border-color:var(--tide)}
.card--file{
  padding-top:2.6rem;
  background:linear-gradient(180deg,var(--paper) 0 26px,var(--paper-2) 26px);
}
.card__tab{
  position:absolute;top:0;left:1.1rem;
  padding:.24rem .85rem;
  background:var(--stone);color:var(--paper);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;
  border-radius:0 0 var(--radius) var(--radius);
}
.card__head{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:.9rem}
.card__title{font-family:var(--font-display);font-size:1.2rem;font-weight:700;color:var(--ink-2)}
.card__meta{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.12em;color:var(--muted)}
.card__body{font-size:.95rem;color:#3B4847}
.card__foot{
  display:flex;align-items:center;justify-content:space-between;gap:.8rem;
  margin-top:1.1rem;padding-top:.9rem;border-top:1px dashed var(--line);
  font-size:.8rem;color:var(--muted);
}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.16rem .55rem;
  border:1px solid currentColor;border-radius:2px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;line-height:1.6;
  color:var(--stone);background:rgba(127,168,166,.12);
}
.tag--brass{color:#8A6F14;background:rgba(201,162,39,.16)}
.tag--amber{color:#8A5F05;background:rgba(230,168,23,.2)}
.tag--crimson{color:#96202F;background:rgba(215,38,61,.14)}
.tag--seal{color:var(--seal);background:rgba(194,69,58,.1)}
.tag--solid{color:var(--paper);background:var(--ink-2);border-color:var(--ink-2)}

.panel{background:var(--paper);border:1px solid var(--line-2);border-radius:var(--radius);overflow:hidden}
.panel__head{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.9rem 1.2rem;
  background:var(--ink-2);color:var(--paper);
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.18em;
}
.panel__body{padding:clamp(1rem,2vw,1.5rem)}
.panel--compare{display:grid;grid-template-columns:minmax(0,1fr);gap:0}
@media (min-width:760px){
  .panel--compare{grid-template-columns:repeat(2,minmax(0,1fr))}
  .panel--compare>*+*{border-left:1px dashed var(--line)}
}

.data-table{font-family:var(--font-mono);font-size:.92rem}
.data-table caption{padding-bottom:.6rem;text-align:left;font-family:var(--font-body);font-size:.8rem;color:var(--muted)}
.data-table th,.data-table td{padding:.65rem .5rem;text-align:left;border-bottom:1px solid var(--line-2)}
.data-table thead th{
  font-family:var(--font-body);font-size:.76rem;font-weight:600;letter-spacing:.18em;
  color:var(--stone);border-bottom:1px solid var(--ink-2);
}
.data-table tbody tr{transition:background-color .2s var(--ease)}
.data-table tbody tr:hover{background:rgba(127,168,166,.12)}

.fold{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-2);overflow:hidden}
.fold+.fold{margin-top:.6rem}
.fold__head{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:1rem 1.2rem;
  font-family:var(--font-display);font-weight:700;color:var(--ink-2);
  cursor:pointer;list-style:none;
}
.fold__head::-webkit-details-marker{display:none}
.fold__head::after{content:"＋";font-family:var(--font-mono);color:var(--brass);transition:transform .25s var(--ease)}
.fold[open] .fold__head::after{transform:rotate(45deg)}
.fold__body{padding:0 1.2rem 1.2rem;font-size:.94rem;color:#3B4847}

.figure{margin:0}
.figure__media{
  position:relative;overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(150deg,var(--tide),var(--stone) 55%,var(--ink-2));
}
.figure__media>img,.figure__media>picture>img{width:100%;height:100%;object-fit:cover}
.figure--4x3 .figure__media{aspect-ratio:4/3}
.figure--3x2 .figure__media{aspect-ratio:3/2}
.figure--1x1 .figure__media{aspect-ratio:1/1}
.figure--tall .figure__media{aspect-ratio:3/4}
.figure__caption{margin-top:.65rem;font-size:.82rem;color:var(--muted)}
.figure__caption .mono{color:var(--stone)}

.to-top{
  position:fixed;right:clamp(1rem,3vw,2rem);bottom:clamp(1rem,3vw,2rem);z-index:110;
  width:46px;height:46px;display:grid;place-items:center;
  border:1px solid var(--ink-2);border-radius:50%;
  background:var(--paper);color:var(--ink-2);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.06em;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .3s var(--ease),visibility .3s var(--ease),transform .3s var(--ease),background-color .3s var(--ease),color .3s var(--ease);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--ink-2);color:var(--paper)}

/* ---------- 9. 正文排版容器 ---------- */
.prose{max-width:var(--maxw-text);font-size:1rem;line-height:1.9;color:#33403F}
.prose>*+*{margin-top:1.05em}
.prose h2{margin-top:2.1em;font-size:clamp(1.32rem,2.4vw,1.8rem)}
.prose h3{margin-top:1.7em}
.prose a{color:var(--stone);text-decoration:underline;text-decoration-color:var(--tide);text-underline-offset:3px}
.prose a:hover{color:var(--seal);text-decoration-color:var(--seal)}
.prose ul,.prose ol{padding-left:1.3em}
.prose li+li{margin-top:.4em}
.prose strong{color:var(--ink-2)}
.prose blockquote{
  padding:.4rem 0 .4rem 1.2rem;
  border-left:2px solid var(--brass);
  font-family:var(--font-display);color:var(--ink-2);
}
.prose hr{height:1px;border:0;margin:2em 0;background:var(--line)}

/* ---------- 10. 显影与章节高亮 ---------- */
html.js [data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 11. 响应式 ---------- */
@media (max-width:1180px){
  .brand__tag{letter-spacing:.14em}
  .site-nav__list{gap:.35rem}
  .site-nav__link{font-size:.84rem;letter-spacing:.06em}
}

@media (max-width:900px){
  :root{--header-h:70px}
  .site-header{
    --nav-fg:rgba(244,241,234,.88);
    --nav-cur:#FFFFFF;
    --nav-bar:var(--brass);
    background-color:var(--ink-2);
    color:var(--paper);
  }
  .site-header::after{opacity:0}
  .site-header__inner{width:min(100% - 1.6rem,var(--maxw-wide))}
  .brand__tag{color:rgba(244,241,234,.58)}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:block;
    position:fixed;left:0;right:0;top:var(--header-h);z-index:-1;
    max-height:calc(100vh - var(--header-h));
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    padding:.4rem 1.2rem 1.6rem;
    background:var(--ink-2);
    border-top:1px solid rgba(244,241,234,.14);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s var(--ease);
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:translateY(0);z-index:1}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__list>li{border-bottom:1px solid rgba(244,241,234,.12)}
  .site-nav__link{display:block;padding:1rem .2rem;font-size:1rem;letter-spacing:.14em}
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{color:var(--brass)}
  .site-nav__tide{
    display:block;height:1px;margin-top:1.2rem;
    background:linear-gradient(90deg,var(--tide),transparent);
  }
  .site-footer__base-inner{justify-content:flex-start}
}

@media (max-width:560px){
  .brand__tag{display:none}
  .brand__seal{width:34px;height:34px;font-size:.72rem}
  .brand__name{font-size:1.04rem;letter-spacing:.1em}
  .btn--sm{padding:.42rem .68rem;font-size:.72rem;letter-spacing:.08em}
  .nav-toggle{padding:.38rem .55rem}
  .nav-toggle__label{display:none}
}

/* ---------- 12. 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 !important;transform:none !important}
  .read-progress__bar{transition:none}
  .card:hover{transform:none}
}