/* ============================================================
   乐鱼赛场 · 共享样式 /assets/site.css
   深水域墨蓝底 · 乐鱼橙高亮 · 控球青绿数据线
   ============================================================ */

/* ---------- 0. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:104px;
}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:rgba(255,122,47,.32);color:#fff}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:6px}

/* ---------- 1. Tokens ---------- */
:root{
  --ink:#06161F;
  --deck:#0B2431;
  --panel:#123243;
  --line:#1E4657;
  --orange:#FF7A2F;
  --orange-soft:#FFB27A;
  --cyan:#35D6B0;
  --card-red:#C4574E;
  --card-yellow:#D3A63C;
  --text:#E9F2F5;
  --muted:#9CB4BE;

  --r-card:20px;
  --r-pill:999px;
  --shell:1240px;
  --gutter:20px;
  --header-top:12px;
  --header-h:58px;

  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --fs-88:clamp(44px,8.4vw,88px);
  --fs-64:clamp(34px,5.6vw,64px);
  --fs-44:clamp(28px,3.8vw,44px);
  --fs-28:clamp(22px,2.4vw,28px);
  --fs-20:20px;
  --fs-17:17px;
  --fs-15:15px;
  --fs-13:13px;
}

/* ---------- 2. Base ---------- */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 90% at 12% -12%, rgba(30,70,87,.55), transparent 62%),
    radial-gradient(90% 70% at 104% 2%, rgba(53,214,176,.08), transparent 58%);
  background-repeat:no-repeat;
  color:var(--text);
  font-family:var(--font-sans);
  font-size:var(--fs-17);
  line-height:1.85;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-weight:800;line-height:1.1;letter-spacing:-.02em;color:var(--text);text-wrap:balance}
p{max-width:38em}
.mono{font-family:var(--font-mono);letter-spacing:.04em;font-variant-numeric:tabular-nums}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:var(--fs-13);
  letter-spacing:.18em;text-transform:uppercase;color:var(--muted);
}
.divider{height:1px;border:0;margin:0;background:linear-gradient(90deg,var(--line),transparent)}

/* ---------- 3. Layout ---------- */
.shell{width:min(100% - var(--gutter) * 2, var(--shell));margin-inline:auto}
.page-main{padding-top:calc(var(--header-top) + var(--header-h) + 44px)}
.section{position:relative;padding-block:clamp(52px,8vw,104px)}
.section--tight{padding-block:clamp(30px,4vw,56px)}
.section--deck{background:linear-gradient(180deg,rgba(11,36,49,.92),rgba(6,22,31,0))}
.section-narrow{max-width:760px;margin-inline:auto}
.section-head{
  position:relative;margin-bottom:clamp(22px,3.6vw,40px);
  padding-top:20px;border-top:1px solid var(--line);
  display:grid;gap:12px;
}
.section-index{
  grid-row:1;font-family:var(--font-mono);font-size:var(--fs-13);
  letter-spacing:.2em;color:var(--muted);text-transform:uppercase;
}
.section-title{font-size:var(--fs-64);color:var(--text)}
.section-lede{font-size:var(--fs-20);line-height:1.7;color:var(--muted);max-width:34em}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.split{display:grid;grid-template-columns:5fr 7fr;gap:clamp(20px,3vw,48px);align-items:start}
.split--reverse{grid-template-columns:7fr 5fr}

/* ---------- 4. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:var(--r-pill);
  border:1px solid transparent;
  font-family:var(--font-sans);font-size:var(--fs-15);font-weight:600;
  line-height:1.2;letter-spacing:.01em;text-decoration:none;white-space:nowrap;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--orange);color:#08171F;border-color:var(--orange)}
.btn-primary:hover{background:var(--orange-soft);border-color:var(--orange-soft)}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--line)}
.btn-ghost:hover{color:var(--orange);border-color:var(--orange)}
.btn-quiet{background:rgba(30,70,87,.5);color:var(--text);border-color:rgba(30,70,87,.9)}
.btn-quiet:hover{border-color:var(--orange)}

/* ---------- 5. Skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:120;
  padding:10px 18px;border-radius:var(--r-pill);
  background:var(--orange);color:#08171F;
  font-size:var(--fs-15);font-weight:700;
  transform:translateY(-180%);
  transition:transform .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{transform:none}

/* ---------- 6. Header ---------- */
.site-header{
  position:fixed;
  top:var(--header-top);left:0;right:0;z-index:60;
  display:flex;justify-content:center;
  padding-inline:var(--gutter);
  pointer-events:none;
}
.header-shell{
  position:relative;pointer-events:auto;
  width:min(100%,var(--shell));
  display:flex;align-items:center;gap:16px;
  padding:10px 12px 10px 16px;
  background:rgba(11,36,49,.94);
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  box-shadow:0 20px 44px -26px rgba(0,0,0,.95),inset 0 1px 0 rgba(233,242,245,.06);
  overflow:hidden;
  transition:padding .22s ease,background .22s ease,border-color .22s ease;
}
.site-header[data-compact="true"] .header-shell{
  padding:6px 10px 6px 14px;
  background:rgba(6,22,31,.97);
  border-color:rgba(30,70,87,.9);
}
.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;min-width:0;color:var(--text)}
.brand-mark{
  position:relative;flex:0 0 auto;
  width:36px;height:36px;border-radius:var(--r-pill);
  background:linear-gradient(160deg,#123243,#06161F);
  border:1px solid var(--line);
  overflow:hidden;
}
.brand-mark::before{
  content:"";position:absolute;left:-7px;right:-7px;top:19px;height:14px;
  border-radius:50%;border-top:2px solid var(--orange);
  transform:rotate(-8deg);
}
.brand-mark::after{
  content:"";position:absolute;left:-9px;right:-9px;top:11px;height:16px;
  border-radius:50%;border-top:2px solid var(--cyan);opacity:.85;
  transform:rotate(6deg);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand-name{font-size:var(--fs-20);font-weight:800;letter-spacing:-.02em}
.brand-suffix{
  font-family:var(--font-mono);font-size:var(--fs-13);font-weight:500;
  letter-spacing:.16em;color:var(--muted);
}
.brand-tagline{
  font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.06em;
  color:var(--muted);white-space:nowrap;margin-left:6px;
}
.site-header[data-compact="true"] .brand-tagline{display:none}

.site-nav{display:flex;align-items:center;gap:6px;margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:flex}
.nav-link{
  display:inline-flex;align-items:baseline;gap:7px;
  padding:9px 13px;border-radius:var(--r-pill);
  font-size:var(--fs-15);line-height:1.3;color:var(--muted);
  transition:color .18s ease,background .18s ease;
}
.nav-num{font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.06em;opacity:.7}
.nav-link:hover{color:var(--text);background:rgba(30,70,87,.55)}
.nav-link[aria-current="page"]{background:var(--orange);color:#08171F;font-weight:700}
.nav-link[aria-current="page"] .nav-num{opacity:.8;color:#08171F}
.nav-extra{display:none}
.nav-cta{display:none}
.nav-note{display:none}

.header-actions{display:flex;align-items:center;gap:8px;margin-left:auto}
.header-cta{flex:0 0 auto}
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 14px;border-radius:var(--r-pill);
  border:1px solid var(--line);color:var(--text);
  font-size:var(--fs-15);
}
.nav-toggle:hover{border-color:var(--orange);color:var(--orange)}
.nav-toggle-lines{display:grid;gap:4px}
.nav-toggle-line{display:block;width:18px;height:2px;border-radius:2px;background:currentColor;transition:transform .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-text{line-height:1}

.header-meter{
  position:absolute;left:22px;right:22px;bottom:3px;height:2px;
  border-radius:2px;background:rgba(30,70,87,.55);overflow:hidden;
}
.header-meter-fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:width .12s linear;
}

/* ---------- 7. Footer ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(56px,9vw,112px);
  padding:clamp(56px,7vw,96px) var(--gutter) 26px;
  background:linear-gradient(180deg,var(--deck) 0%,var(--ink) 82%);
  color:var(--muted);font-size:var(--fs-15);
}
.footer-wave{
  position:absolute;top:0;left:-15%;width:130%;
  height:clamp(44px,6vw,80px);
  background:var(--ink);
  border-radius:0 0 50% 50% / 0 0 100% 100%;
  pointer-events:none;
}
.footer-wave::after{
  content:"";position:absolute;left:8%;right:8%;bottom:6px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(53,214,176,.55),rgba(255,122,47,.4),transparent);
}
.footer-inner{
  position:relative;
  width:min(100%,var(--shell));margin-inline:auto;
  display:grid;gap:clamp(28px,4vw,56px);
  grid-template-columns:minmax(0,1.15fr) minmax(0,1.5fr) minmax(0,1fr);
  padding-bottom:clamp(26px,4vw,44px);
}
.footer-brand .brand--footer{margin-bottom:14px}
.footer-brand-note{max-width:24em;line-height:1.8;font-size:var(--fs-15)}
.footer-chips{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 18px}
.chip{
  padding:4px 12px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:rgba(18,50,67,.65);
  font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.06em;
  color:var(--muted);
}
.footer-cta{align-self:flex-start}
.footer-columns{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:clamp(18px,3vw,32px)}
.footer-col-title{
  font-family:var(--font-mono);font-size:var(--fs-13);font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;color:var(--text);
  margin-bottom:12px;line-height:1.4;
}
.footer-links{display:grid;gap:8px}
.footer-link{
  display:inline-block;font-size:var(--fs-15);color:var(--muted);
  transition:color .16s ease,transform .16s ease;
}
.footer-link:hover{color:var(--orange-soft);transform:translateX(2px)}
.footer-contact-title{
  font-family:var(--font-mono);font-size:var(--fs-13);font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;color:var(--text);
  margin-bottom:12px;line-height:1.4;
}
.contact-row{display:flex;gap:10px;padding:6px 0;border-bottom:1px dashed rgba(30,70,87,.7);font-size:var(--fs-13)}
.contact-key{flex:0 0 34px;font-family:var(--font-mono);letter-spacing:.1em;color:rgba(156,180,190,.75)}
.contact-value{color:var(--text);font-family:var(--font-mono);letter-spacing:.02em;word-break:break-all;line-height:1.6}
.footer-contact-note{margin-top:12px;font-size:var(--fs-13);line-height:1.75;color:var(--muted)}
.footer-legal{
  position:relative;
  width:min(100%,var(--shell));margin-inline:auto;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;
  padding-top:18px;border-top:1px solid rgba(30,70,87,.85);
  font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.04em;color:var(--muted);
}
.footer-legal-line,.footer-legal-note{max-width:none}

/* ---------- 8. Back to top ---------- */
.back-top{
  position:fixed;right:clamp(16px,3vw,32px);bottom:clamp(16px,3vw,32px);z-index:55;
  display:inline-flex;align-items:center;gap:10px;
  max-width:min(78vw,300px);
  padding:10px 16px;border-radius:var(--r-pill);
  background:rgba(18,50,67,.94);
  border:1px solid var(--line);
  color:var(--text);font-size:var(--fs-13);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease,border-color .2s ease,color .2s ease;
}
.back-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.back-top:hover{border-color:var(--orange);color:var(--orange)}
.back-top-arrow{color:var(--orange);font-size:var(--fs-15);line-height:1}
.back-top-label{white-space:nowrap}
.back-top-chapter{
  font-family:var(--font-mono);letter-spacing:.06em;color:var(--muted);
  max-width:10em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}

/* ---------- 9. Breadcrumbs ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.06em;
  color:var(--muted);margin-bottom:clamp(18px,2.4vw,28px);
}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs-link{color:var(--muted);transition:color .16s ease}
.crumbs-link:hover{color:var(--orange)}
.crumbs-sep{color:rgba(30,70,87,1)}
.crumbs-current{color:var(--text)}

/* ---------- 10. Prose ---------- */
.prose{font-size:var(--fs-17);line-height:1.85;color:var(--text)}
.prose p{max-width:36em;margin-bottom:1.15em}
.prose h3{
  font-size:var(--fs-28);margin:1.8em 0 .6em;letter-spacing:-.01em;
}
.prose h3:first-child{margin-top:0}
.prose ul,.prose ol{max-width:36em;margin:0 0 1.2em;padding-left:1.2em;list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.5em}
.prose li::marker{color:var(--orange)}
.prose a{color:var(--orange-soft);text-decoration:underline;text-underline-offset:3px}
.prose strong{color:#fff;font-weight:700}
.prose blockquote{
  max-width:36em;margin:1.6em 0;padding:2px 0 2px 18px;
  border-left:2px solid var(--cyan);color:var(--muted);
}
.prose code{
  font-family:var(--font-mono);font-size:.92em;
  padding:2px 6px;border-radius:6px;background:rgba(18,50,67,.85);color:var(--orange-soft);
}

/* ---------- 11. Cards & panels ---------- */
.card{
  position:relative;display:block;
  padding:clamp(18px,2.2vw,26px);
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  color:inherit;
  transition:border-color .2s ease,transform .2s ease,background .2s ease;
}
a.card:hover{border-color:rgba(255,122,47,.6);transform:translateY(-2px);background:#14384B}
.card-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:10px;margin-bottom:10px}
.card-title{font-size:var(--fs-20);font-weight:700;letter-spacing:-.01em;line-height:1.35}
.card-note{font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.06em;color:var(--muted)}
.card-body{font-size:var(--fs-15);line-height:1.8;color:var(--muted);max-width:34em}
.panel{
  padding:clamp(18px,2.4vw,28px);
  background:rgba(18,50,67,.72);
  border:1px solid var(--line);
  border-radius:var(--r-card);
}
.panel-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:10px;margin-bottom:14px}
.panel-title{font-size:var(--fs-20);font-weight:700;letter-spacing:-.01em}
.panel-note{font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.06em;color:var(--muted)}

/* ---------- 12. Stats & tags ---------- */
.stat-row{display:flex;flex-wrap:wrap;gap:clamp(16px,3vw,40px)}
.stat{display:flex;flex-direction:column;gap:2px}
.stat-value{
  font-family:var(--font-mono);font-size:var(--fs-28);font-weight:700;
  letter-spacing:.02em;color:var(--cyan);line-height:1.2;
}
.stat-label{font-size:var(--fs-13);letter-spacing:.06em;color:var(--muted)}
.tag-list{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:rgba(18,50,67,.65);
  font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.04em;
  color:var(--muted);
}
.tag--orange{border-color:rgba(255,122,47,.55);color:var(--orange-soft)}
.tag--cyan{border-color:rgba(53,214,176,.5);color:var(--cyan)}
.tag--red{border-color:rgba(196,87,78,.6);color:#D98A83}
.tag--yellow{border-color:rgba(211,166,60,.6);color:#E0BB70}

/* ---------- 13. Table & lane ---------- */
.data-table{width:100%;border-collapse:collapse;font-size:var(--fs-15)}
.data-table th,.data-table td{
  padding:11px 14px;text-align:left;
  border-bottom:1px solid rgba(30,70,87,.7);
}
.data-table th{
  font-family:var(--font-mono);font-size:var(--fs-13);font-weight:500;
  letter-spacing:.08em;color:var(--muted);
}
.data-table td{color:var(--text)}
.data-table .num{font-family:var(--font-mono);letter-spacing:.04em;color:var(--cyan)}
.lane{
  display:flex;gap:14px;overflow-x:auto;padding-bottom:10px;
  scroll-snap-type:x proximity;
}
.lane > *{flex:0 0 min(320px,80vw);scroll-snap-align:start}
.lane::-webkit-scrollbar{height:6px}
.lane::-webkit-scrollbar-track{background:rgba(30,70,87,.4);border-radius:var(--r-pill)}
.lane::-webkit-scrollbar-thumb{background:var(--line);border-radius:var(--r-pill)}

/* ---------- 14. Media ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--r-card);border:1px solid var(--line);
  background:linear-gradient(150deg,var(--panel),var(--ink));
  aspect-ratio:16 / 9;
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:4 / 5}
.media--square{aspect-ratio:1 / 1}
.media-frame{display:grid;gap:10px}
.media-caption{font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.04em;color:var(--muted)}
.media-tag{
  position:absolute;left:12px;bottom:12px;
  padding:4px 12px;border-radius:var(--r-pill);
  background:rgba(6,22,31,.82);border:1px solid var(--line);
  font-family:var(--font-mono);font-size:var(--fs-13);letter-spacing:.04em;color:var(--orange-soft);
}

/* ---------- 15. TOC ---------- */
.toc{position:sticky;top:calc(var(--header-top) + var(--header-h) + 24px);font-family:var(--font-mono);font-size:var(--fs-13)}
.toc-title{letter-spacing:.18em;text-transform:uppercase;color:var(--text);margin-bottom:10px}
.toc-list{display:grid;gap:2px;border-left:1px solid var(--line)}
.toc-link{
  display:flex;gap:8px;padding:7px 12px;margin-left:-1px;
  border-left:2px solid transparent;
  color:var(--muted);
  transition:color .16s ease,border-color .16s ease,background .16s ease;
}
.toc-link:hover{color:var(--text);background:rgba(18,50,67,.55)}
.toc-link[aria-current="true"]{color:var(--orange);border-left-color:var(--orange);background:rgba(255,122,47,.08)}
.toc-num{opacity:.65}

/* ---------- 16. Decoration & motion ---------- */
.wave-lines{
  position:absolute;left:-10%;right:-10%;height:clamp(120px,22vw,260px);
  bottom:0;pointer-events:none;
  background:
    radial-gradient(120% 100% at 50% 100%, rgba(53,214,176,.12), transparent 70%),
    radial-gradient(90% 90% at 18% 100%, rgba(255,122,47,.09), transparent 70%);
  -webkit-mask-image:linear-gradient(to top,#000 32%,transparent);
  mask-image:linear-gradient(to top,#000 32%,transparent);
}
.tactics-grid{
  position:absolute;inset:0;pointer-events:none;opacity:.3;
  background-image:linear-gradient(to right,rgba(30,70,87,.7) 1px,transparent 1px);
  background-size:calc(100% / 6) 100%;
  -webkit-mask-image:linear-gradient(to bottom,#000,transparent);
  mask-image:linear-gradient(to bottom,#000,transparent);
}
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .26s ease,transform .26s ease}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 17. Responsive ---------- */
@media (max-width:1180px){
  .brand-tagline{display:none}
  .nav-link{padding:9px 11px}
}
@media (max-width:1024px){
  .footer-inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-brand{grid-column:1 / -1}
  .split,.split--reverse{grid-template-columns:1fr}
}
@media (max-width:980px){
  :root{--header-h:54px}
  .header-shell{padding:8px 10px 8px 12px;gap:10px;border-radius:26px}
  .site-nav{
    position:fixed;
    left:var(--gutter);right:var(--gutter);
    top:calc(var(--header-top) + var(--header-h) + 16px);
    display:none;flex-direction:column;align-items:stretch;gap:0;
    max-height:calc(100vh - 132px);overflow-y:auto;
    padding:14px;
    background:rgba(11,36,49,.98);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    box-shadow:0 30px 70px -34px rgba(0,0,0,.96);
  }
  .site-nav[data-open="true"]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;width:100%}
  .nav-item{width:100%}
  .nav-link{
    width:100%;justify-content:flex-start;
    padding:12px 14px;border-radius:14px;
    font-size:var(--fs-17);color:var(--text);
  }
  .nav-link:hover{background:rgba(30,70,87,.55)}
  .nav-link[aria-current="page"]{border-radius:14px}
  .nav-extra{
    display:flex;flex-direction:column;gap:8px;
    margin-top:12px;padding-top:12px;border-top:1px solid var(--line);
  }
  .nav-cta{display:inline-flex;justify-content:center;width:100%}
  .nav-note{display:block;font-size:var(--fs-13);letter-spacing:.04em;color:var(--muted)}
  .header-cta{display:none}
  .nav-toggle{display:inline-flex}
  .header-actions{margin-left:auto}
}
@media (max-width:860px){
  .grid-2,.grid-3{grid-template-columns:1fr}
  .section-title{font-size:var(--fs-44)}
  .footer-inner{grid-template-columns:1fr}
  .footer-legal{flex-direction:column;gap:6px}
}
@media (max-width:560px){
  :root{--gutter:16px}
  .brand-suffix{font-size:11px;letter-spacing:.12em}
  .nav-toggle-text{display:none}
  .nav-toggle{padding:9px 11px}
  .footer-wave{height:44px}
  .back-top{max-width:calc(100vw - 32px)}
  .back-top-chapter{max-width:6em}
  .stat-value{font-size:var(--fs-20)}
}

/* ---------- 18. Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .btn:hover,.footer-link:hover,a.card:hover{transform:none}
}