/* =========================================================
   /assets/site.css — 中欧体育 共享外壳与基础组件
   ========================================================= */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;min-height:100vh;}
h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video,canvas{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;cursor:pointer;}
[hidden]{display:none !important;}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;}

/* ---------- tokens ---------- */
:root{
  --navy:#0B1B2B;
  --bridge:#12293F;
  --orange:#FF5A1F;
  --cyan:#2FE3D6;
  --gold:#F2B24C;
  --graphite:#2A3038;
  --mist:#F4F7FA;
  --green:#35C48A;
  --sand:#E8EDF2;
  --red:#E5484D;

  --ink:var(--mist);
  --ink-70:rgba(244,247,250,.72);
  --ink-55:rgba(244,247,250,.55);
  --edge:rgba(232,237,242,.12);
  --edge-strong:rgba(47,227,214,.34);
  --panel-a:rgba(18,41,63,.94);
  --panel-b:rgba(11,27,43,.96);
  --shadow-deep:0 24px 60px -30px rgba(0,0,0,.94);

  --shell:min(1200px, 100% - 40px);
  --cut:polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  --cut-sm:polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));

  --font-head:"Inter Tight","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --dur:180ms;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- base ---------- */
body{
  position:relative;
  background-color:var(--navy);
  background-image:
    radial-gradient(1100px 620px at 84% -8%, rgba(47,227,214,.12), transparent 62%),
    radial-gradient(900px 520px at 4% 0%, rgba(255,90,31,.12), transparent 60%),
    linear-gradient(180deg,#0B1B2B 0%,#0B1B2B 56%,#0A1725 100%);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  letter-spacing:.01em;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(47,227,214,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47,227,214,.05) 1px, transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(ellipse at 50% 0%, #000 8%, transparent 72%);
  mask-image:radial-gradient(ellipse at 50% 0%, #000 8%, transparent 72%);
}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:800;line-height:1.12;letter-spacing:-.01em;color:var(--mist);}
p{color:var(--ink-70);}
strong{color:var(--mist);}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:10px;left:50%;
  z-index:200;
  padding:12px 20px;
  border-radius:999px;
  background:var(--cyan);
  color:#07131F;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  transform:translate(-50%,-180%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{
  transform:translate(-50%,0);
  outline:2px solid var(--mist);
  outline-offset:2px;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 20px;
  border-radius:14px;
  font-family:var(--font-head);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),
             background-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.btn-primary{
  background:linear-gradient(118deg,var(--orange) 0%,#FF7C3D 100%);
  color:#12161B;
  clip-path:var(--cut-sm);
  box-shadow:0 12px 26px -14px rgba(255,90,31,.85);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 34px -16px rgba(255,90,31,.95);}
.btn-primary:focus-visible{
  outline:none;
  box-shadow:inset 0 0 0 2px var(--cyan),inset 0 0 0 4px rgba(11,27,43,.92);
}
.btn-ghost{
  background:transparent;
  color:var(--mist);
  box-shadow:inset 0 0 0 1px rgba(47,227,214,.36);
}
.btn-ghost:hover{background:rgba(47,227,214,.12);color:var(--cyan);}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  padding:14px 0 0;
  background:linear-gradient(180deg,rgba(11,27,43,.92) 0%,rgba(11,27,43,.55) 68%,rgba(11,27,43,0) 100%);
}
.header-shell{width:var(--shell);margin-inline:auto;}
.nav-island{
  position:relative;
  display:flex;
  align-items:center;
  gap:16px;
  padding:10px 14px;
  border-radius:26px;
  border:1px solid var(--edge);
  background:linear-gradient(115deg,rgba(18,41,63,.95) 0%,rgba(11,27,43,.93) 56%,rgba(18,41,63,.95) 100%);
  box-shadow:0 22px 46px -30px rgba(0,0,0,.95),inset 0 1px 0 rgba(244,247,250,.06);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.nav-island::before{
  content:"";
  position:absolute;
  top:-1px;left:18px;
  width:104px;height:2px;
  background:linear-gradient(90deg,var(--orange),rgba(255,90,31,0));
  border-radius:2px;
}
.nav-island::after{
  content:"";
  position:absolute;
  right:26px;bottom:-1px;
  width:132px;height:2px;
  background:linear-gradient(270deg,var(--cyan),rgba(47,227,214,0));
  border-radius:2px;
}

/* brand */
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  min-height:44px;
  padding-right:4px;
  color:var(--mist);
}
.brand-mark{
  display:grid;
  place-items:center;
  width:38px;height:38px;
  background:linear-gradient(142deg,var(--orange) 0%,#FF8A3D 100%);
  color:#0B1B2B;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.02em;
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.brand-text{display:flex;flex-direction:column;line-height:1.18;}
.brand-name{font-family:var(--font-head);font-weight:800;font-size:17px;letter-spacing:.02em;color:var(--mist);}
.brand-line{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--ink-55);}

/* nav */
.site-nav{flex:1 1 auto;display:flex;justify-content:center;}
.nav-list{display:flex;align-items:center;gap:2px;}
.nav-item{flex:0 0 auto;}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 14px;
  border-radius:999px;
  color:rgba(244,247,250,.78);
  font-size:15px;
  font-weight:500;
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:14px;right:14px;bottom:8px;
  height:2px;
  border-radius:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.nav-link:hover{color:var(--mist);background:rgba(47,227,214,.1);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;}
.nav-link[aria-current="page"]{
  color:var(--mist);
  font-weight:700;
  background:linear-gradient(118deg,rgba(255,90,31,.3) 0%,rgba(255,90,31,.12) 100%);
  box-shadow:inset 0 0 0 1px rgba(255,90,31,.45);
}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange);}

/* header actions */
.header-actions{margin-left:auto;display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.version-badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border-radius:999px;
  border:1px solid rgba(242,178,76,.34);
  background:rgba(242,178,76,.1);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--gold);
  white-space:nowrap;
}
.version-dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 3px rgba(53,196,138,.18);
  flex:0 0 auto;
}
.version-mono{font-family:var(--font-mono);font-weight:700;}
.version-text{color:var(--ink-55);font-size:11px;letter-spacing:.08em;}
.header-cta{font-size:14px;padding:0 18px;}

/* scroll meter */
.scroll-meter{
  position:absolute;
  left:50%;
  bottom:0;
  width:min(520px,56%);
  height:2px;
  border-radius:2px;
  overflow:hidden;
  background:rgba(244,247,250,.1);
  transform:translateX(-50%);
  pointer-events:none;
}
.scroll-meter-bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:width 120ms linear;
}

/* mobile toggle */
.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  min-width:44px;
  padding:0 12px;
  border-radius:999px;
  border:1px solid rgba(244,247,250,.18);
  background:rgba(244,247,250,.05);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--edge-strong);background:rgba(47,227,214,.12);}
.nav-toggle-bars{display:grid;gap:4px;width:18px;}
.nav-toggle-bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.site-header[data-open] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.site-header[data-open] .nav-toggle-bars span:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:80px;
  padding:60px 0 30px;
  background:linear-gradient(180deg,rgba(18,41,63,.62) 0%,rgba(11,27,43,.98) 72%);
  border-top:1px solid var(--edge);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:3px;
  background:linear-gradient(90deg,var(--orange) 0 16%,var(--cyan) 16% 32%,rgba(47,227,214,0) 62%);
}
.footer-shell{width:var(--shell);margin-inline:auto;}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,.72fr)) minmax(0,1.5fr);
  gap:32px 28px;
}
.footer-brand .brand{margin-bottom:14px;}
.footer-blurb{max-width:34ch;font-size:14px;line-height:1.75;color:var(--ink-55);}
.footer-version{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:14px;
  padding:6px 12px;
  border-radius:999px;
  border:1px solid rgba(242,178,76,.3);
  background:rgba(242,178,76,.08);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--gold);
}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-links{display:flex;flex-direction:column;gap:2px;}
.footer-link{
  display:inline-flex;
  align-items:center;
  min-height:38px;
  font-size:15px;
  color:rgba(244,247,250,.74);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-link::before{
  content:"";
  width:12px;height:1px;
  margin-right:0;
  background:var(--orange);
  opacity:0;
  transition:width var(--dur) var(--ease),opacity var(--dur) var(--ease),margin-right var(--dur) var(--ease);
}
.footer-link:hover{color:var(--mist);}
.footer-link:hover::before{width:14px;opacity:1;margin-right:8px;}
.footer-link:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;}
.footer-contact{
  padding:18px 20px;
  border:1px solid var(--edge);
  border-radius:16px;
  background:rgba(11,27,43,.55);
}
.footer-contact-line{font-size:13px;line-height:1.9;color:var(--ink-70);word-break:break-word;}
.footer-address{
  margin-top:8px;
  font-style:normal;
  font-size:13px;
  line-height:1.8;
  color:var(--ink-55);
}
.footer-note{
  margin-top:12px;
  padding-top:12px;
  border-top:1px dashed rgba(232,237,242,.14);
  font-size:12px;
  line-height:1.75;
  color:var(--ink-55);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:8px 24px;
  margin-top:40px;
  padding-top:20px;
  border-top:1px solid var(--edge);
}
.footer-legal-item{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--ink-55);
}

/* ---------- layout containers ---------- */
.shell{width:var(--shell);margin-inline:auto;}
.section{padding:64px 0;}
.section--tight{padding:36px 0;}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom:26px;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.page-title{
  font-family:var(--font-head);
  font-weight:800;
  font-size:clamp(30px,5vw,58px);
  line-height:1.06;
  letter-spacing:-.02em;
  color:var(--mist);
}
.lede{max-width:62ch;font-size:17px;line-height:1.8;color:var(--ink-70);}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:20px;}
.cols-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;}
.cols-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--ink-55);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb li + li::before{content:"/";color:rgba(244,247,250,.26);}
.breadcrumb a{color:var(--cyan);transition:color var(--dur) var(--ease);}
.breadcrumb a:hover{color:var(--mist);}

/* ---------- panels & cards ---------- */
.panel{
  position:relative;
  padding:24px;
  border:1px solid var(--edge);
  background:linear-gradient(150deg,var(--panel-a) 0%,var(--panel-b) 100%);
  clip-path:var(--cut);
}
.panel--light{
  background:var(--sand);
  border-color:transparent;
  color:#0B1B2B;
}
.panel--light h2,.panel--light h3{color:#0B1B2B;}
.panel--light p{color:#31404F;}

.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:22px;
  border:1px solid var(--edge);
  background:linear-gradient(150deg,var(--panel-a) 0%,var(--panel-b) 100%);
  clip-path:var(--cut);
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.card:hover,.card:focus-within{
  transform:translateY(-4px);
  box-shadow:var(--shadow-deep);
  border-color:var(--edge-strong);
}
.card-title{font-family:var(--font-head);font-size:20px;font-weight:700;line-height:1.3;color:var(--mist);}
.card-text{font-size:15px;line-height:1.75;color:var(--ink-70);}
.card-meta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--cyan);
  font-variant-numeric:tabular-nums;
}

/* ---------- tags & filters ---------- */
.tag-row{display:flex;flex-wrap:wrap;gap:8px;}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 10px;
  border-radius:999px;
  border:1px solid rgba(47,227,214,.28);
  background:rgba(47,227,214,.1);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--cyan);
  white-space:nowrap;
}
.tag--gold{border-color:rgba(242,178,76,.34);background:rgba(242,178,76,.12);color:var(--gold);}
.tag--orange{border-color:rgba(255,90,31,.36);background:rgba(255,90,31,.14);color:#FFB08A;}

.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
.filter-chip{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 16px;
  border-radius:999px;
  border:1px solid var(--edge);
  background:rgba(244,247,250,.04);
  color:var(--ink-70);
  font-size:14px;
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.filter-chip:hover{color:var(--mist);border-color:var(--edge-strong);background:rgba(47,227,214,.1);}
.filter-chip[aria-pressed="true"]{
  background:var(--orange);
  border-color:var(--orange);
  color:#101820;
  font-weight:700;
}
.filter-count{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--ink-55);
}

/* ---------- rail ---------- */
.rail-wrap{position:relative;}
.rail-nav{display:flex;gap:8px;}
.rail-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:44px;height:44px;
  border-radius:50%;
  border:1px solid var(--edge);
  background:rgba(18,41,63,.9);
  color:var(--mist);
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease),
             color var(--dur) var(--ease);
}
.rail-btn:hover{border-color:var(--edge-strong);background:rgba(47,227,214,.14);color:var(--cyan);}
.rail{
  display:flex;
  gap:16px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  padding:4px 2px 16px;
  scrollbar-width:thin;
  scrollbar-color:rgba(47,227,214,.4) transparent;
}
.rail > *{flex:0 0 min(320px,84%);scroll-snap-align:start;}
.rail::-webkit-scrollbar{height:6px;}
.rail::-webkit-scrollbar-thumb{background:rgba(47,227,214,.35);border-radius:999px;}

/* ---------- media ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border-radius:14px;
  background:linear-gradient(155deg,#12293F 0%,#0B1B2B 72%);
  box-shadow:inset 0 0 0 1px var(--edge);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    radial-gradient(120% 90% at 78% 10%,rgba(47,227,214,.16),transparent 62%),
    linear-gradient(200deg,rgba(255,90,31,.14),transparent 55%);
}
.media-frame img{width:100%;height:100%;object-fit:cover;}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:4 / 5;}
.media-caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--ink-55);
}

/* ---------- stats ---------- */
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;}
.stat{
  padding:16px 18px;
  border:1px solid var(--edge);
  background:rgba(18,41,63,.74);
  clip-path:var(--cut-sm);
}
.stat-value{
  display:block;
  font-family:var(--font-mono);
  font-size:26px;
  line-height:1.2;
  color:var(--gold);
  font-variant-numeric:tabular-nums;
}
.stat-label{display:block;margin-top:4px;font-size:12px;letter-spacing:.06em;color:var(--ink-55);}

/* ---------- numbered chapter ---------- */
.chapter{display:grid;grid-template-columns:auto minmax(0,1fr);gap:20px;align-items:start;}
.chapter-num{
  font-family:var(--font-mono);
  font-size:clamp(30px,4.4vw,46px);
  line-height:1;
  color:transparent;
  -webkit-text-stroke:1px rgba(47,227,214,.55);
}
.chapter-body{display:flex;flex-direction:column;gap:12px;}

/* ---------- responsive ---------- */
@media (max-width:1120px){
  .nav-link{padding:0 10px;font-size:14px;}
  .version-text{display:none;}
  .footer-grid{grid-template-columns:minmax(0,1.4fr) repeat(3,minmax(0,.7fr));}
  .footer-contact{grid-column:1 / -1;}
}
@media (max-width:980px){
  .nav-toggle{display:inline-flex;}
  .site-nav{
    position:absolute;
    top:calc(100% + 10px);
    left:0;right:0;
    display:block;
    padding:10px;
    border:1px solid var(--edge);
    border-radius:20px;
    background:linear-gradient(180deg,rgba(18,41,63,.99) 0%,rgba(11,27,43,.99) 100%);
    box-shadow:0 28px 54px -24px rgba(0,0,0,.95);
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) linear;
  }
  .site-header[data-open] .site-nav,
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:4px;}
  .nav-item{width:100%;}
  .nav-link{width:100%;justify-content:flex-start;padding:0 16px;border-radius:12px;font-size:15px;}
  .nav-link::after{left:16px;right:auto;width:22px;bottom:10px;}
  .cols-2,.cols-3{grid-template-columns:1fr;}
  .site-footer{margin-top:56px;padding-top:48px;}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px;}
  .footer-brand{grid-column:1 / -1;}
  .footer-contact{grid-column:1 / -1;}
}
@media (max-width:720px){
  :root{--shell:min(1200px, 100% - 28px);}
  .header-cta{display:none;}
  .brand-line{display:none;}
  .nav-island{gap:10px;padding:9px 12px;border-radius:20px;}
  .site-header{padding-top:10px;}
  .section{padding:44px 0;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-legal{flex-direction:column;gap:6px;}
  .chapter{grid-template-columns:1fr;gap:8px;}
}
@media (max-width:420px){
  .nav-toggle-label{display:none;}
  .scroll-meter{width:44%;}
}

/* ---------- motion preferences ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .card:hover,.card:focus-within{transform:none;}
  .btn-primary:hover{transform:none;}
  .scroll-meter-bar{transition:none;}
}