/* ===== 1. RESET ===== */
*,*::before,*::after{box-sizing:border-box}
html,body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
button{border:0;background:none;font:inherit;color:inherit;cursor:pointer}
a{color:inherit;text-decoration:none}
img,svg,video{max-width:100%;display:block}
table{border-collapse:collapse;border-spacing:0}

/* ===== 2. TOKENS ===== */
:root{
  --ink-900:#060B1A;
  --ink-800:#0B1428;
  --ink-700:#142238;
  --steel-500:#2E4A6B;
  --mist-200:#A9BDD4;
  --cold-white:#EAF2FF;
  --neon:#4BFF9E;
  --flare:#FF4D2E;
  --amber:#FFB03A;
  --violet:#1B2F5C;

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

  --rail-w:256px;
  --shell-max:1440px;
  --gutter:clamp(16px,4vw,44px);
  --t:180ms;
  --ease:cubic-bezier(.2,.6,.2,1);
  --radius-s:4px;
  --radius-m:10px;
  --radius-pill:999px;
  --hair:rgba(169,189,212,.14);
  --hair-strong:rgba(169,189,212,.26);
  --header-h:62px;
}

/* ===== 3. BASE / 中文排版 ===== */
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 18px);
  scrollbar-color:var(--steel-500) var(--ink-800);
}
body{
  background:var(--ink-900);
  color:var(--mist-200);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.55;
  font-weight:400;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background:
    radial-gradient(120% 70% at 88% -10%,rgba(75,255,158,.07),transparent 60%),
    radial-gradient(90% 60% at -10% 110%,rgba(46,74,107,.32),transparent 65%);
}
h1,h2,h3,h4,h5{color:var(--cold-white);font-weight:300;line-height:1.18;letter-spacing:-.012em}
p,li,dd,dt{word-break:normal;line-break:strict}
strong,b{color:var(--cold-white);font-weight:600}
::selection{background:var(--neon);color:var(--ink-900)}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:2px}

.num,.stat-value,.bar-value,.section-index,.rail-step,.footer-icp,.footer-copy,.timeline-stamp,.cutoff-badge,.footer-cutoff{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
}

.skip-link{
  position:absolute;
  left:12px;
  top:-64px;
  z-index:200;
  padding:10px 18px;
  border-radius:var(--radius-pill);
  background:var(--neon);
  color:var(--ink-900);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  transition:top var(--t) var(--ease);
}
.skip-link:focus{top:12px}

/* ===== 4. HEADER ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:linear-gradient(180deg,rgba(6,11,26,.97) 0%,rgba(6,11,26,.86) 100%);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--hair);
}
.header-inner{
  max-width:var(--shell-max);
  margin:0 auto;
  padding:10px var(--gutter);
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,26px);
  min-height:var(--header-h);
}
.brand-island{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:10px;
  padding:6px 16px 6px 8px;
  border:1px solid var(--hair-strong);
  border-radius:var(--radius-pill);
  background:var(--ink-800);
  transition:border-color var(--t) var(--ease),background var(--t) var(--ease);
}
.brand-island:hover{border-color:rgba(75,255,158,.55);background:var(--ink-700)}
.brand-mark{
  display:grid;
  place-items:center;
  width:30px;height:30px;
  border-radius:var(--radius-pill);
  background:linear-gradient(150deg,var(--neon),#1f8f5c);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:-.04em;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-size:14px;font-weight:600;color:var(--cold-white);letter-spacing:.01em}
.brand-note{font-size:10.5px;letter-spacing:.16em;color:var(--steel-500);text-transform:uppercase}

.nav-switch{display:flex;gap:6px;flex:0 0 auto}
.switch-chip{
  padding:6px 13px;
  border-radius:var(--radius-pill);
  border:1px dashed var(--hair-strong);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--mist-200);
  transition:border-color var(--t) var(--ease),color var(--t) var(--ease),background var(--t) var(--ease);
}
.switch-chip:hover{border-style:solid;border-color:var(--neon);color:var(--neon);background:rgba(75,255,158,.06)}

.site-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:inline-block;
  padding:7px 13px;
  border-radius:var(--radius-pill);
  font-size:13.5px;
  color:var(--mist-200);
  letter-spacing:.04em;
  white-space:nowrap;
  transition:color var(--t) var(--ease),background var(--t) var(--ease);
}
.nav-link:hover{color:var(--cold-white);background:var(--ink-700)}
.nav-link[aria-current="page"]{
  color:var(--cold-white);
  background:var(--violet);
  box-shadow:inset 0 0 0 1px rgba(75,255,158,.35);
}
.nav-link[aria-current="page"]::before{
  content:"";
  display:inline-block;
  width:5px;height:5px;
  margin-right:7px;
  border-radius:50%;
  background:var(--neon);
  vertical-align:2px;
}

.cutoff-badge{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 13px;
  border-radius:var(--radius-pill);
  background:var(--ink-800);
  border:1px solid var(--hair);
  font-size:11px;
  letter-spacing:.05em;
  color:var(--mist-200);
  white-space:nowrap;
}
.cutoff-dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--neon);
  box-shadow:0 0 0 3px rgba(75,255,158,.16);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:8px 15px;
  border:1px solid var(--hair-strong);
  border-radius:var(--radius-pill);
  background:var(--ink-800);
  color:var(--cold-white);
  font-size:12.5px;
  letter-spacing:.1em;
  transition:border-color var(--t) var(--ease);
}
.nav-toggle:hover{border-color:var(--neon)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:12px}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;left:0;right:0;height:1.5px;
  background:var(--neon);
  border-radius:2px;
  transition:transform var(--t) var(--ease),top var(--t) var(--ease);
}
.nav-toggle-bars::before{top:2px}
.nav-toggle-bars::after{top:9px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:6px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:6px;transform:rotate(-45deg)}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:linear-gradient(90deg,var(--neon) 0%,var(--amber) 100%);
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
  will-change:transform;
}

/* ===== 5. FOOTER ===== */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(48px,8vw,120px);
  border-top:1px solid var(--hair);
  background:var(--ink-800);
}
.footer-inner{
  max-width:var(--shell-max);
  margin:0 auto;
  padding:clamp(32px,5vw,64px) var(--gutter) clamp(24px,3.4vw,44px);
  display:grid;
  grid-template-columns:minmax(200px,1.15fr) minmax(0,2.3fr) minmax(230px,1.2fr);
  gap:clamp(24px,4vw,60px);
}
.footer-brand-name{font-size:20px;font-weight:300;color:var(--cold-white);letter-spacing:-.01em}
.footer-brand-note{margin-top:7px;font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--steel-500)}
.footer-cutoff{margin-top:20px;font-size:11.5px;color:var(--neon);letter-spacing:.04em}

.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2.6vw,34px)}
.footer-col-title{
  margin-bottom:14px;
  font-size:11px;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--steel-500);
}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-link{
  display:inline-block;
  font-size:13.5px;
  color:var(--mist-200);
  transition:color var(--t) var(--ease),transform var(--t) var(--ease);
}
.footer-link:hover{color:var(--neon);transform:translateX(3px)}
.footer-plain{font-size:13.5px;color:var(--mist-200)}

.footer-contact{display:flex;flex-direction:column;gap:14px}
.contact-line{display:flex;flex-direction:column;gap:4px;font-size:13.5px}
.contact-key{font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--steel-500)}
.contact-val{color:var(--cold-white);word-break:break-word;line-height:1.5}
.copy-btn{
  align-self:flex-start;
  margin-top:7px;
  padding:6px 14px;
  border-radius:var(--radius-pill);
  border:1px solid var(--hair-strong);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--mist-200);
  transition:border-color var(--t) var(--ease),color var(--t) var(--ease),background var(--t) var(--ease);
}
.copy-btn:hover{border-color:var(--neon);color:var(--neon)}
.copy-btn[data-copied="true"]{border-color:var(--neon);color:var(--neon);background:rgba(75,255,158,.08)}
.footer-note{font-size:12px;line-height:1.65;color:var(--steel-500)}

.footer-base{
  max-width:var(--shell-max);
  margin:0 auto;
  padding:16px var(--gutter);
  border-top:1px solid var(--hair);
  display:flex;
  flex-wrap:wrap;
  gap:12px 28px;
  justify-content:space-between;
  align-items:center;
}
.footer-icp,.footer-copy{font-size:11.5px;letter-spacing:.06em;color:var(--steel-500)}

/* ===== 6. LAYOUT ===== */
.shell{max-width:var(--shell-max);margin:0 auto;padding:0 var(--gutter)}
.shell-split{
  display:grid;
  grid-template-columns:var(--rail-w) minmax(0,1fr);
  gap:clamp(20px,3.6vw,64px);
  align-items:start;
  max-width:var(--shell-max);
  margin:0 auto;
  padding:0 var(--gutter);
}
.content{min-width:0;position:relative;z-index:1}
.band{padding-block:clamp(32px,6vw,84px)}
.band-alt{background:var(--ink-800);border-block:1px solid var(--hair)}
.stack>*+*{margin-top:clamp(16px,2.4vw,32px)}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid-8-4{grid-template-columns:8fr 4fr}
.grid-7-5{grid-template-columns:7fr 5fr}
.grid-9-3{grid-template-columns:9fr 3fr}
.grid-6-6{grid-template-columns:1fr 1fr}

/* ===== 7. RAIL ===== */
.rail{position:sticky;top:calc(var(--header-h) + 22px);padding-block:clamp(24px,4vw,56px)}
.rail-title{
  margin-bottom:14px;
  font-size:10.5px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--steel-500);
}
.rail-nav{display:flex;flex-direction:column;border-left:1px solid var(--hair)}
.rail-link{
  position:relative;
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:10px;
  align-items:baseline;
  padding:9px 0 9px 16px;
  font-size:14px;
  color:var(--mist-200);
  transition:color var(--t) var(--ease),background var(--t) var(--ease);
}
.rail-link::before{
  content:"";
  position:absolute;
  left:-1px;top:7px;bottom:7px;
  width:2px;
  background:var(--neon);
  opacity:0;
  transition:opacity var(--t) var(--ease);
}
.rail-link:hover{color:var(--cold-white);background:rgba(27,47,92,.4)}
.rail-link:hover::before{opacity:.45}
.rail-link.is-active{color:var(--cold-white)}
.rail-link.is-active::before{opacity:1}
.rail-step{font-size:11px;color:var(--steel-500)}
.rail-link.is-active .rail-step{color:var(--neon)}
.rail-meta{padding-left:16px;margin-top:12px;font-size:11.5px;letter-spacing:.06em;color:var(--steel-500)}

/* ===== 8. PAGE HEAD / BREADCRUMB ===== */
.page-head{padding-block:clamp(30px,6vw,72px) clamp(18px,3vw,32px)}
.page-title{
  max-width:20ch;
  font-size:clamp(28px,5.2vw,62px);
  font-weight:200;
  letter-spacing:-.03em;
  line-height:1.05;
  color:var(--cold-white);
}
.page-lede{margin-top:18px;max-width:34em;font-size:16px;color:var(--mist-200)}
.kicker{
  display:block;
  margin-bottom:12px;
  font-size:12px;
  font-weight:800;
  font-style:italic;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--neon);
}
.eyebrow{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--steel-500)}

.breadcrumb{padding-block:14px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;font-size:12px;color:var(--steel-500)}
.breadcrumb-item{display:flex;align-items:center}
.breadcrumb-item+.breadcrumb-item::before{content:"/";margin:0 9px;color:var(--steel-500)}
.breadcrumb-item a{color:var(--mist-200);transition:color var(--t) var(--ease)}
.breadcrumb-item a:hover{color:var(--neon)}
.breadcrumb-item[aria-current="page"]{color:var(--cold-white)}

/* ===== 9. SECTION ===== */
.section{padding-block:clamp(26px,4.6vw,64px);border-top:1px solid var(--hair)}
.section:first-of-type{border-top:0}
.section-head{display:flex;align-items:baseline;gap:14px;margin-bottom:clamp(16px,2.4vw,26px);flex-wrap:wrap}
.section-index{font-size:12px;letter-spacing:.14em;color:var(--neon)}
.section-title{font-size:clamp(18px,2.4vw,27px);font-weight:300;color:var(--cold-white)}
.section-note{margin-left:auto;font-size:11.5px;letter-spacing:.08em;color:var(--steel-500)}

.prose p{max-width:38em;font-size:15.5px;color:var(--mist-200)}
.prose p+p{margin-top:14px}
.prose ul{margin-top:14px;max-width:38em;display:flex;flex-direction:column;gap:9px}
.prose ul li{position:relative;padding-left:18px;font-size:15px}
.prose ul li::before{content:"";position:absolute;left:0;top:.62em;width:8px;height:1px;background:var(--neon)}

/* ===== 10. BUTTONS / CHIPS ===== */
.btn{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:11px 20px;
  border-radius:var(--radius-pill);
  border:1px solid var(--hair-strong);
  background:transparent;
  color:var(--cold-white);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.04em;
  transition:background var(--t) var(--ease),border-color var(--t) var(--ease),color var(--t) var(--ease),transform var(--t) var(--ease);
}
.btn::after{content:"→";font-family:var(--font-mono);transition:transform var(--t) var(--ease)}
.btn:hover{border-color:var(--neon);color:var(--neon);transform:translateX(2px)}
.btn-primary{background:var(--neon);border-color:var(--neon);color:var(--ink-900)}
.btn-primary:hover{background:#6cffb2;border-color:#6cffb2;color:var(--ink-900)}
.btn-primary::after{content:"→"}
.btn-ghost{border-color:transparent;padding-inline:0}
.btn-ghost:hover{border-color:transparent}

.pill-row{display:flex;flex-wrap:wrap;gap:8px}
.filter-chip{
  padding:6px 14px;
  border-radius:var(--radius-pill);
  border:1px solid var(--hair-strong);
  background:var(--ink-800);
  color:var(--mist-200);
  font-size:12.5px;
  letter-spacing:.05em;
  transition:border-color var(--t) var(--ease),color var(--t) var(--ease),background var(--t) var(--ease);
}
.filter-chip:hover{border-color:var(--neon);color:var(--cold-white)}
.filter-chip[aria-pressed="true"]{background:var(--violet);border-color:var(--neon);color:var(--cold-white)}

/* ===== 11. DATA COMPONENTS ===== */
.data-card{
  padding:18px 20px;
  border:1px solid var(--hair);
  border-radius:var(--radius-m);
  background:var(--ink-800);
  transition:border-color var(--t) var(--ease),background var(--t) var(--ease),transform var(--t) var(--ease);
}
.data-card:hover{border-color:var(--hair-strong);background:var(--ink-700);transform:translateY(-2px)}
.data-card-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:15px}
.data-card-title{font-size:12.5px;font-weight:800;font-style:italic;letter-spacing:.07em;color:var(--cold-white)}
.data-card-note{font-size:10.5px;letter-spacing:.12em;color:var(--steel-500)}

.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(92px,1fr));gap:14px}
.stat{display:flex;flex-direction:column;gap:6px}
.stat-value{font-size:clamp(22px,2.8vw,32px);font-weight:600;line-height:1;color:var(--cold-white)}
.stat-label{font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--steel-500)}
.stat-delta{font-family:var(--font-mono);font-size:11.5px;color:var(--neon);font-variant-numeric:tabular-nums}
.stat-delta[data-trend="down"]{color:var(--flare)}
.stat-delta[data-trend="flat"]{color:var(--steel-500)}

.bar-chart{display:flex;flex-direction:column;gap:11px}
.bar-row{display:grid;grid-template-columns:minmax(70px,auto) minmax(0,1fr) auto;gap:12px;align-items:center;font-size:13px}
.bar-track{height:6px;border-radius:3px;background:var(--ink-700);overflow:hidden}
.bar-fill{height:100%;width:var(--bar,0%);border-radius:3px;background:linear-gradient(90deg,var(--flare),var(--amber))}
.bar-value{font-size:13px;color:var(--cold-white)}

.heat-grid{display:grid;grid-template-columns:repeat(var(--cols,6),minmax(0,1fr));gap:4px}
.heat-cell{aspect-ratio:1;border-radius:3px;background:rgba(75,255,158,var(--heat,.08))}

.timeline{position:relative;padding-left:20px}
.timeline::before{content:"";position:absolute;left:3px;top:7px;bottom:7px;width:1px;background:var(--hair)}
.timeline-item{position:relative;padding-bottom:18px}
.timeline-item:last-child{padding-bottom:0}
.timeline-mark{
  position:absolute;left:-20px;top:6px;
  width:7px;height:7px;border-radius:50%;
  background:var(--steel-500);
  box-shadow:0 0 0 3px var(--ink-800);
}
.timeline-item[data-state="current"] .timeline-mark{background:var(--neon);box-shadow:0 0 0 3px rgba(75,255,158,.18)}
.timeline-stamp{font-size:11px;letter-spacing:.08em;color:var(--steel-500)}
.timeline-body{margin-top:5px;font-size:14px;color:var(--mist-200)}

.table-wrap{overflow-x:auto;border:1px solid var(--hair);border-radius:var(--radius-m);background:var(--ink-800)}
.data-table{width:100%;min-width:520px;font-size:13.5px}
.data-table caption{padding:14px 16px 0;text-align:left;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--steel-500)}
.data-table th{
  padding:12px 16px;
  text-align:left;
  font-size:10.5px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--steel-500);
  border-bottom:1px solid var(--hair-strong);
  white-space:nowrap;
}
.data-table td{padding:11px 16px;border-bottom:1px solid var(--hair);color:var(--mist-200)}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table tbody tr{transition:background var(--t) var(--ease)}
.data-table tbody tr:hover{background:rgba(27,47,92,.55)}
.data-table tbody tr:hover td{color:var(--cold-white)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;
  border-radius:var(--radius-pill);
  border:1px solid var(--hair-strong);
  background:rgba(27,47,92,.5);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mist-200);
}
.tag-neon{border-color:rgba(75,255,158,.5);background:rgba(75,255,158,.08);color:var(--neon)}
.tag-flare{border-color:rgba(255,77,46,.5);background:rgba(255,77,46,.08);color:var(--flare)}

.accordion{border-top:1px solid var(--hair)}
.accordion-item{border-bottom:1px solid var(--hair)}
.accordion-trigger{
  width:100%;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 0;
  text-align:left;
  font-size:15px;
  color:var(--cold-white);
  transition:color var(--t) var(--ease);
}
.accordion-trigger::after{
  content:"+";
  font-family:var(--font-mono);
  font-size:18px;
  line-height:1;
  color:var(--neon);
  transition:transform var(--t) var(--ease);
}
.accordion-trigger:hover{color:var(--neon)}
.accordion-trigger[aria-expanded="true"]::after{transform:rotate(45deg)}
.accordion-panel{display:none;padding-bottom:18px}
.accordion-panel[data-open]{display:block}
.accordion-panel p{max-width:38em;font-size:14.5px}

/* ===== 12. IMAGE FRAMES ===== */
.img-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--hair);
  border-radius:var(--radius-m);
  background:linear-gradient(160deg,var(--ink-700) 0%,var(--ink-900) 72%);
}
.img-frame>img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.05)}
.img-frame::after{
  content:"";
  position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(6,11,26,0) 38%,rgba(6,11,26,.78) 100%);
}
.img-frame-wide{aspect-ratio:16/9}
.img-frame{aspect-ratio:16/9}
.img-frame-tall{aspect-ratio:3/4}
.img-frame-square{aspect-ratio:1/1}

/* ===== 13. REVEAL ===== */
.reveal{opacity:1;transform:none;transition:opacity 440ms var(--ease),transform 440ms var(--ease)}
html.js .reveal{opacity:0;transform:translateY(10px)}
html.js .reveal.is-visible{opacity:1;transform:none}

/* ===== 14. RESPONSIVE ===== */
@media (max-width:1180px){
  .cutoff-badge{display:none}
}
@media (max-width:1024px){
  .nav-switch{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;
    top:100%;left:0;right:0;
    display:none;
    padding:8px var(--gutter) 18px;
    background:var(--ink-900);
    border-bottom:1px solid var(--hair-strong);
  }
  .site-nav[data-open]{display:block}
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    padding:10px;
    border:1px solid var(--hair-strong);
    border-radius:var(--radius-m);
    background:var(--ink-800);
  }
  .nav-link{display:block;padding:12px 14px;border-radius:var(--radius-s);font-size:14.5px}
  .nav-link[aria-current="page"]{box-shadow:none;border-left:2px solid var(--neon)}

  .shell-split{grid-template-columns:1fr;gap:0}
  .rail{
    position:static;
    padding-block:22px;
    border-bottom:1px solid var(--hair);
    margin-bottom:24px;
  }
  .rail-nav{flex-direction:row;flex-wrap:wrap;border-left:0;gap:6px}
  .rail-link{
    padding:7px 13px;
    border:1px solid var(--hair-strong);
    border-radius:var(--radius-pill);
    grid-template-columns:auto;
    background:var(--ink-800);
  }
  .rail-link::before{display:none}
  .rail-link.is-active{border-color:var(--neon)}
  .rail-step{display:none}
  .rail-meta{padding-left:0}

  .footer-inner{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:900px){
  .grid-8-4,.grid-7-5,.grid-9-3,.grid-6-6{grid-template-columns:1fr}
}
@media (max-width:720px){
  body{font-size:15px}
  .header-inner{padding:9px var(--gutter);gap:10px}
  .brand-note{display:none}
  .brand-island{padding:5px 12px 5px 6px}
  .nav-toggle-label{display:none}
  .page-title{font-size:clamp(26px,7.4vw,38px)}
  .footer-inner{grid-template-columns:1fr;gap:28px}
  .footer-cols{grid-template-columns:1fr 1fr}
  .footer-base{flex-direction:column;align-items:flex-start;gap:8px}
  .section-note{margin-left:0;width:100%}
  .data-card{padding:16px}
}

/* ===== 15. MOTION / PRINT ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  html.js .reveal{opacity:1;transform:none}
  .btn:hover,.footer-link:hover,.data-card:hover{transform:none}
}
@media print{
  .site-header,.site-footer,.scroll-progress{display:none}
  body{background:#fff;color:#111}
}