:root{
  --ink:#0A1020;
  --panel:#111B31;
  --line:#1E2A45;
  --cyan:#22D3EE;
  --green:#34D399;
  --gold:#F0B429;
  --archive:#7C90AE;
  --text:#E6EDF7;
  --muted:#9BA9C2;
  --danger:#F87171;
  --frame:2px;
  --r-s:4px;
  --r-m:8px;
  --r-l:10px;
  --wrap:1280px;
  --step:8px;
  --shadow-hard:6px 6px 0 rgba(8,13,26,.85);
  --shadow-cyan:6px 6px 0 rgba(34,211,238,.22);
  --font-display:"HarmonyOS Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(140% 90% at 88% -10%,rgba(34,211,238,.10),transparent 58%),
    radial-gradient(120% 80% at 0% 100%,rgba(124,144,174,.10),transparent 60%),
    var(--ink);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  word-break:normal;
  line-break:strict;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,picture,video{display:block;max-width:100%}
h1,h2,h3,h4,h5,h6{margin:0;font-family:var(--font-display);font-weight:300;line-height:1.1;letter-spacing:-.005em}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0 0 1em;padding-left:1.2em}
a{color:var(--cyan);text-decoration:none}
a:hover{color:#7EE8FA}
strong{font-weight:700}
code,kbd,samp,pre{font-family:var(--font-mono);font-size:.92em}
table{border-collapse:collapse;width:100%}
hr{border:0;border-top:1px solid var(--line)}

:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:2px}

/* ---------- layout ---------- */
.wrap{width:min(var(--wrap),100% - 48px);margin-inline:auto}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:16px}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

[data-section]{position:relative}
[data-section]::before{
  content:"";
  position:absolute;
  left:-16px;top:6px;bottom:6px;width:2px;
  background:var(--line);
  opacity:.5;
  transition:background-color .2s ease,box-shadow .2s ease,opacity .2s ease;
}
[data-section][data-state="active"]::before{
  background:var(--cyan);
  opacity:1;
  box-shadow:0 0 14px rgba(34,211,238,.55);
}

.section-head{display:grid;gap:10px;margin:0 0 24px;max-width:46em}
.section-kicker{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.section-title{
  margin:0;
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(28px,4.6vw,56px);
  line-height:1.06;
  letter-spacing:-.012em;
}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;
  left:14px;top:-80px;
  z-index:120;
  padding:10px 16px;
  border-radius:var(--r-s);
  background:var(--cyan);
  color:#04121A;
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  transition:top .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{top:14px;color:#04121A}

/* ---------- header frame ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg,#0D1628 0%,#0A1020 100%);
  border-bottom:var(--frame) solid var(--line);
  box-shadow:0 12px 32px rgba(4,8,18,.72);
}
.header-frame{
  max-width:var(--wrap);
  margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(0,auto) minmax(0,1fr) auto;
  align-items:stretch;
  min-height:74px;
  border-left:var(--frame) solid var(--line);
  border-right:var(--frame) solid var(--line);
}
.brand-cell{
  display:flex;
  align-items:center;
  gap:14px;
  padding:10px 20px;
  border-right:var(--frame) solid var(--line);
  background:linear-gradient(90deg,rgba(34,211,238,.12),rgba(34,211,238,0) 72%);
}
.brand{display:flex;align-items:center;gap:12px;color:var(--text)}
.brand:hover{color:var(--text)}
.brand-monogram{
  display:grid;place-items:center;
  width:42px;height:42px;
  flex:none;
  border:var(--frame) solid var(--cyan);
  border-radius:var(--r-s);
  background:rgba(34,211,238,.07);
  box-shadow:3px 3px 0 rgba(34,211,238,.24);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.06em;
  color:var(--cyan);
}
.brand-text{display:block;min-width:0}
.brand-name{display:block;font-size:17px;font-weight:600;letter-spacing:.03em;line-height:1.3}
.brand-tagline{display:block;margin-top:3px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--muted)}
.version-badge{
  flex:none;
  padding:3px 9px;
  border:1px solid rgba(240,180,41,.45);
  border-radius:999px;
  background:rgba(240,180,41,.09);
  color:var(--gold);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.06em;
  white-space:nowrap;
}

/* ---------- nav ---------- */
.frame-nav{display:flex;align-items:stretch;justify-content:space-between;min-width:0}
.nav-list{display:flex;align-items:stretch;list-style:none;margin:0;padding:0;min-width:0}
.nav-item{display:flex;border-right:var(--frame) solid var(--line)}
.nav-link{
  position:relative;
  display:flex;align-items:center;
  padding:0 17px;
  color:var(--muted);
  font-size:14px;
  letter-spacing:.04em;
  white-space:nowrap;
  transition:color .18s ease,background-color .18s ease;
}
.nav-link::after{
  content:"";
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .2s ease;
}
.nav-link:hover{color:var(--text);background:rgba(34,211,238,.07)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  background:rgba(34,211,238,.10);
  font-weight:700;
}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-actions{
  display:flex;align-items:center;gap:10px;
  padding:0 16px;
  border-left:var(--frame) solid var(--line);
}
.nav-toggle{
  display:none;
  align-items:center;gap:10px;
  padding:0 18px;
  border:0;
  border-left:var(--frame) solid var(--line);
  background:rgba(34,211,238,.05);
  color:var(--text);
  font-family:var(--font-body);
  font-size:13px;
  letter-spacing:.1em;
  cursor:pointer;
}
.nav-toggle:hover{background:rgba(34,211,238,.12)}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bars i{display:block;height:2px;background:var(--cyan);transition:transform .18s ease,opacity .18s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle-text{white-space:nowrap}

.read-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--gold));
  transform:scaleX(var(--progress,0));
  transform-origin:0 50%;
  transition:transform .12s linear;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;
  border:var(--frame) solid transparent;
  border-radius:var(--r-s);
  font-family:var(--font-body);
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1.2;
  text-align:center;
  cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn-primary{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#04121A;
  box-shadow:4px 4px 0 rgba(34,211,238,.28);
}
.btn-primary:hover{color:#04121A;transform:translate(-2px,-2px);box-shadow:6px 6px 0 rgba(34,211,238,.42)}
.btn-ghost{
  background:transparent;
  border-color:rgba(240,180,41,.55);
  color:var(--gold);
}
.btn-ghost:hover{color:var(--gold);background:rgba(240,180,41,.10);transform:translate(-2px,-2px);box-shadow:4px 4px 0 rgba(240,180,41,.22)}
.btn-sm{padding:8px 13px;font-size:12px}

/* ---------- small parts ---------- */
.index-num{font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.08em;color:var(--archive)}
.status-dot{
  display:inline-block;flex:none;
  width:8px;height:8px;border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 3px rgba(52,211,153,.18);
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(124,144,174,.10);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  white-space:nowrap;
}
.tag-cyan{color:var(--cyan);border-color:rgba(34,211,238,.42);background:rgba(34,211,238,.09)}
.tag-gold{color:var(--gold);border-color:rgba(240,180,41,.42);background:rgba(240,180,41,.09)}
.tag-green{color:var(--green);border-color:rgba(52,211,153,.42);background:rgba(52,211,153,.09)}
.tag-archive{color:var(--archive);border-color:rgba(124,144,174,.38);background:rgba(124,144,174,.12)}
.note-block{
  margin:16px 0;
  padding:2px 0 2px 16px;
  border-left:3px solid var(--archive);
  color:var(--muted);
  font-size:14px;
  line-height:1.7;
}
.divider{margin:40px 0;height:0;border:0;border-top:1px solid var(--line)}

/* ---------- panel ---------- */
.panel{
  position:relative;
  padding:22px;
  border:var(--frame) solid var(--line);
  border-radius:var(--r-m);
  background:linear-gradient(160deg,var(--panel),#0D1526 78%);
  box-shadow:var(--shadow-hard);
}
.panel-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  margin-bottom:14px;padding-bottom:12px;
  border-bottom:1px solid var(--line);
}
.panel-title{margin:0;font-family:var(--font-body);font-size:15px;font-weight:600;letter-spacing:.05em}

/* ---------- breadcrumb ---------- */
.breadcrumb{margin:24px 0 0}
.breadcrumb-list{
  display:flex;flex-wrap:wrap;gap:10px;
  list-style:none;margin:0;padding:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--archive);
}
.breadcrumb-item+.breadcrumb-item::before{content:"／";margin-right:10px;color:var(--line)}
.breadcrumb-link{color:var(--muted)}
.breadcrumb-link:hover{color:var(--cyan)}
.breadcrumb-item[aria-current="page"]{color:var(--text)}

/* ---------- media frames ---------- */
.media-frame{
  position:relative;
  display:block;
  margin:0;
  overflow:hidden;
  border:var(--frame) solid var(--line);
  border-radius:var(--r-m);
  background:
    radial-gradient(120% 110% at 14% 0%,rgba(34,211,238,.18),transparent 62%),
    radial-gradient(100% 90% at 100% 100%,rgba(240,180,41,.12),transparent 60%),
    linear-gradient(160deg,#14203A,#0A1020 76%);
  box-shadow:var(--shadow-hard);
}
.media-frame::before{
  content:"";
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(124,144,174,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(124,144,174,.10) 1px,transparent 1px);
  background-size:32px 32px;
  pointer-events:none;
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame figcaption{
  position:absolute;left:0;right:0;bottom:0;
  padding:12px 14px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(10,16,32,.2),rgba(10,16,32,.94));
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--3x4{aspect-ratio:3/4}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:72px;
  border-top:var(--frame) solid var(--line);
  background:linear-gradient(180deg,#0B1223 0%,#080D18 100%);
}
.site-footer::before{
  content:"";
  position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--cyan) 16%,var(--gold) 64%,transparent 94%);
  opacity:.6;
}
.footer-frame{
  max-width:var(--wrap);
  margin-inline:auto;
  padding:56px 24px 28px;
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(0,1.9fr);
  gap:36px 40px;
  border-left:var(--frame) solid var(--line);
  border-right:var(--frame) solid var(--line);
}
.footer-brand{display:grid;gap:16px;align-content:start}
.footer-monogram{
  display:grid;place-items:center;
  width:54px;height:54px;
  border:var(--frame) solid var(--cyan);
  border-radius:var(--r-s);
  background:rgba(34,211,238,.07);
  box-shadow:5px 5px 0 rgba(34,211,238,.2);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:500;
  letter-spacing:.06em;
  color:var(--cyan);
}
.footer-brand-line{margin:0;max-width:24em;font-size:17px;line-height:1.65;color:var(--text)}
.footer-note{margin:0;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--archive)}
.footer-links{display:grid;gap:14px;align-content:start}
.footer-heading{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-list{
  list-style:none;margin:0;padding:0;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:10px 16px;
}
.footer-item{display:block}
.footer-link{
  display:flex;align-items:center;gap:12px;
  padding:12px 14px;
  border:var(--frame) solid var(--line);
  border-radius:var(--r-s);
  background:var(--panel);
  color:var(--text);
  font-size:14px;
  letter-spacing:.02em;
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease,background-color .18s ease;
}
.footer-link:hover{
  color:var(--text);
  background:#14203A;
  border-color:var(--cyan);
  transform:translate(-3px,-3px);
  box-shadow:4px 4px 0 rgba(34,211,238,.24);
}
.footer-index{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--archive)}
.footer-contact{
  grid-column:1 / -1;
  padding:18px 20px;
  border:var(--frame) solid var(--line);
  border-left:3px solid var(--archive);
  border-radius:var(--r-s);
  background:rgba(124,144,174,.07);
}
.footer-contact-line{margin:0 0 6px;color:var(--text);font-size:14px;line-height:1.7}
.footer-address{margin:0;color:var(--muted);font-size:13px;line-height:1.7}
.footer-base{
  grid-column:1 / -1;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;
  padding-top:18px;
  border-top:1px solid var(--line);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
}
.footer-icp{color:var(--archive)}
.footer-copy{color:var(--muted)}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .brand-tagline{display:none}
  .nav-link{padding:0 12px;font-size:13px}
  .nav-actions{padding:0 12px;gap:8px}
}
@media (max-width:1100px){
  .header-frame{grid-template-columns:minmax(0,1fr) auto;min-height:66px}
  .nav-toggle{display:inline-flex}
  .frame-nav{
    display:none;
    grid-column:1 / -1;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    border-top:var(--frame) solid var(--line);
    background:var(--ink);
    max-height:min(72vh,540px);
    overflow-y:auto;
  }
  .frame-nav[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch}
  .nav-item{border-right:0;border-bottom:1px solid var(--line)}
  .nav-link{padding:16px 20px;font-size:15px;color:var(--text)}
  .nav-link[aria-current="page"]{background:rgba(34,211,238,.12);box-shadow:inset 3px 0 0 var(--cyan)}
  .nav-actions{flex-direction:column;align-items:stretch;padding:16px 20px;border-left:0;border-top:1px solid var(--line);gap:12px}
  .nav-actions .btn{width:100%}
  [data-section]::before{display:none}
  .footer-frame{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:900px){
  .wrap{width:min(var(--wrap),100% - 32px)}
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr))}
  .col-3,.col-4,.col-6,.col-8,.col-12{grid-column:1 / -1}
  .footer-list{grid-template-columns:minmax(0,1fr)}
  .footer-frame{padding:44px 20px 24px;gap:28px}
  .section-title{font-size:clamp(26px,7vw,40px)}
  .panel{padding:18px}
}
@media (max-width:560px){
  body{font-size:15.5px}
  .brand-cell{padding:8px 14px;gap:10px}
  .version-badge{display:none}
  .brand-monogram{width:36px;height:36px;font-size:11px}
  .brand-name{font-size:15px}
  .btn{padding:10px 14px;font-size:12.5px}
  .btn-sm{padding:7px 11px}
  .read-progress{height:2px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .read-progress{transition:none}
}