/* ==========================================================================
   乐盈服务 · city-leying.com.cn
   Shared Site Kit — /assets/site.css
   1 reset · 2 tokens · 3 base & typography · 4 header rail · 5 footer plate
   6 buttons · 7 page-level base components · 8 motion & a11y
   ========================================================================== */

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

/* ---------- 2. Tokens ---------- */
:root{
  --ink:#0B1F2A;
  --teal-900:#123B4A;
  --teal-700:#1E4E5F;
  --slate:#5B6B73;
  --mist:#F5F7F8;
  --fog:#E8EDF0;
  --orange:#F08A3C;
  --orange-lift:#F79B55;
  --signal:#2FA36B;
  --signal-soft:#5AC48D;
  --wine:#7A2E3A;
  --indigo:#4B3A78;

  --rule:rgba(11,31,42,.14);
  --rule-strong:rgba(11,31,42,.32);
  --rule-dark:rgba(245,247,248,.14);
  --rule-dark-soft:rgba(245,247,248,.07);

  --font-sans:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --rail-w:236px;
  --top-h:64px;
  --maxw:1280px;
  --gutter:clamp(18px,4vw,56px);
  --read-progress:0;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 3. Base & typography ---------- */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.8;
  color:var(--ink);
  background-color:var(--fog);
  background-image:
    linear-gradient(to right,rgba(11,31,42,.045) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(11,31,42,.045) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-font-smoothing:antialiased;
  text-underline-offset:3px;
}
h1,h2,h3,h4{line-height:1.25;font-weight:800;letter-spacing:-.02em;color:var(--ink)}
p{max-width:74ch}
strong,b{font-weight:800}
::selection{background:var(--orange);color:var(--ink)}

.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}

/* ---------- 4. Header / side rail ---------- */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:140;
  padding:10px 16px;
  background:var(--orange);color:var(--ink);
  font-size:13px;font-weight:800;letter-spacing:.04em;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.site-header{
  position:fixed;top:0;left:0;bottom:0;z-index:60;
  width:var(--rail-w);
  display:flex;flex-direction:column;
  padding:20px 18px 16px;
  background:var(--ink);
  color:var(--mist);
  border-right:1px solid rgba(245,247,248,.13);
}
.site-header::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--orange);pointer-events:none;
}

.rail-head{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding-bottom:16px;
  border-bottom:1px solid var(--rule-dark);
}

.brand{display:flex;align-items:center;gap:10px;min-height:44px}
.brand-mark{position:relative;flex:0 0 auto;width:22px;height:22px;border:1px solid rgba(245,247,248,.45)}
.brand-mark::before{content:"";position:absolute;left:4px;top:4px;width:1px;height:14px;background:rgba(245,247,248,.3)}
.brand-dot{position:absolute;right:-4px;bottom:-4px;width:8px;height:8px;background:var(--orange);box-shadow:0 0 0 2px var(--ink)}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-size:16px;font-weight:800;letter-spacing:.06em}
.brand-sub{font-family:var(--font-mono);font-size:9px;letter-spacing:.18em;color:rgba(245,247,248,.45);margin-top:4px}

.nav-toggle{
  display:none;
  flex-direction:column;align-items:center;justify-content:center;gap:5px;
  width:44px;height:44px;
  border:1px solid rgba(245,247,248,.28);border-radius:2px;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:rgba(245,247,248,.6);background:rgba(255,255,255,.05)}
.nav-toggle-bar{display:block;width:18px;height:2px;background:var(--mist);transition:transform .22s var(--ease),opacity .18s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(7px) 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(-7px) rotate(-45deg)}

.site-nav{
  flex:1 1 auto;min-height:0;
  display:flex;flex-direction:column;
  margin-top:18px;
  overflow-y:auto;overscroll-behavior:contain;
  padding-right:2px;
}
.nav-caption{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  color:rgba(245,247,248,.42);
  padding-bottom:10px;margin-bottom:6px;
  border-bottom:1px solid var(--rule-dark-soft);
  max-width:none;
}
.nav-list{display:grid;gap:2px;margin-top:8px}
.nav-item{position:relative}
.nav-link{
  position:relative;
  display:grid;grid-template-columns:26px 1fr 12px;align-items:center;gap:8px;
  padding:10px 8px 10px 10px;
  border-left:2px solid transparent;
  color:rgba(245,247,248,.72);
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav-num{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:rgba(245,247,248,.4);transition:color .18s var(--ease)}
.nav-label{font-size:15px;font-weight:700;letter-spacing:.02em}
.nav-tick{display:block;width:8px;height:1px;background:currentColor;opacity:0;transition:opacity .18s var(--ease),width .18s var(--ease)}
.nav-link:hover{background:rgba(255,255,255,.055);color:var(--mist)}
.nav-link:hover .nav-num{color:var(--orange)}
.nav-link:hover .nav-tick{opacity:.7;width:12px}
.nav-link[aria-current="page"]{
  border-left-color:var(--orange);
  background:linear-gradient(90deg,rgba(240,138,60,.18),rgba(240,138,60,0) 82%);
  color:#fff;
}
.nav-link[aria-current="page"] .nav-num{color:var(--orange)}
.nav-link[aria-current="page"] .nav-tick{opacity:1;width:12px;background:var(--orange)}

.nav-actions{margin-top:auto;padding-top:22px;display:grid;gap:8px}
.nav-meta{
  margin-top:12px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;line-height:1.7;
  color:rgba(245,247,248,.36);
  max-width:none;
}

.rail-foot{margin-top:16px;padding-top:12px;border-top:1px solid var(--rule-dark-soft)}
.rail-scale{
  display:block;height:14px;
  background-image:repeating-linear-gradient(90deg,rgba(245,247,248,.38) 0 1px,transparent 1px 12px);
  background-repeat:repeat-x;
  background-position:left center;
}
.rail-coord{
  display:block;margin-top:8px;
  font-family:var(--font-mono);font-size:9px;letter-spacing:.16em;
  color:rgba(245,247,248,.4);
}

.rail-progress{
  position:absolute;top:0;right:0;
  width:3px;height:100%;
  background:var(--orange);
  transform:scaleY(var(--read-progress));
  transform-origin:top center;
  transition:transform .12s linear;
  pointer-events:none;
}

/* ---------- 5. Footer plate ---------- */
.site-footer{
  position:relative;
  background:var(--ink);
  color:var(--mist);
  border-top:2px solid var(--orange);
  overflow:hidden;
}
.foot-band{
  display:flex;align-items:center;gap:18px;
  padding:12px max(var(--gutter),calc((100% - var(--maxw)) / 2 + var(--gutter)));
  border-bottom:1px solid var(--rule-dark);
}
.foot-band-mono{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;
  color:rgba(245,247,248,.5);white-space:nowrap;
}
.foot-band-line{
  flex:1;height:8px;
  background-image:repeating-linear-gradient(90deg,rgba(245,247,248,.3) 0 1px,transparent 1px 12px);
  background-repeat:repeat-x;
}

.foot-grid{
  display:grid;grid-template-columns:1.25fr 1fr 1.15fr;
  max-width:var(--maxw);margin-inline:auto;
  padding-inline:var(--gutter);
}
.foot-col{padding:34px 26px 34px 28px;border-left:1px solid var(--rule-dark)}
.foot-col:first-child{padding-left:0;border-left:0}
.foot-col--contact{padding-right:0}

.foot-brand{font-size:22px;font-weight:800;letter-spacing:.08em;color:var(--mist);max-width:none}
.foot-tag{margin-top:8px;font-size:13px;line-height:1.7;color:rgba(245,247,248,.62);max-width:26ch}
.foot-coord{
  margin-top:20px;padding-top:12px;
  border-top:1px solid var(--rule-dark-soft);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;line-height:2;
  color:rgba(245,247,248,.42);max-width:none;
}

.foot-title{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;
  color:var(--signal-soft);margin-bottom:12px;max-width:none;
}
.foot-list + .foot-title{margin-top:22px}
.foot-list li + li{border-top:1px solid var(--rule-dark-soft)}
.foot-list a{
  display:flex;align-items:baseline;gap:10px;
  padding:8px 0;
  font-size:14px;font-weight:600;
  color:rgba(245,247,248,.78);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.foot-num{font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;color:rgba(245,247,248,.36);transition:color .18s var(--ease)}
.foot-list a:hover{color:#fff;padding-left:4px}
.foot-list a:hover .foot-num{color:var(--orange)}

.foot-contact li{
  display:grid;grid-template-columns:46px 1fr;gap:10px;
  padding:8px 0;
  border-top:1px solid var(--rule-dark-soft);
  font-size:13.5px;line-height:1.7;
  color:rgba(245,247,248,.78);
}
.foot-contact li:first-child{border-top:0;padding-top:0}
.foot-key{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  color:rgba(245,247,248,.42);padding-top:4px;
}

.foot-base{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 26px;
  padding:16px max(var(--gutter),calc((100% - var(--maxw)) / 2 + var(--gutter))) 26px;
  border-top:1px solid var(--rule-dark);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:rgba(245,247,248,.5);
}
.foot-copy,.foot-icp{max-width:none;font-family:inherit;font-size:inherit;letter-spacing:inherit;color:inherit}
.to-top{
  margin-left:auto;
  padding:8px 14px;
  border:1px solid rgba(245,247,248,.3);border-radius:2px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:rgba(245,247,248,.8);
  transition:border-color .18s var(--ease),color .18s var(--ease),background .18s var(--ease);
}
.to-top:hover{border-color:var(--orange);color:var(--orange);background:rgba(240,138,60,.1)}

/* ---------- 6. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:11px 18px;
  font-size:14px;font-weight:800;letter-spacing:.03em;
  border:1px solid transparent;border-radius:2px;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .12s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--block{display:flex;width:100%}
.btn--primary{background:var(--orange);color:var(--ink);border-color:var(--orange)}
.btn--primary:hover{background:var(--orange-lift);border-color:var(--orange-lift)}
.btn--signal{background:rgba(47,163,107,.1);color:var(--signal-soft);border-color:rgba(47,163,107,.55)}
.btn--signal:hover{background:rgba(47,163,107,.2);border-color:var(--signal-soft)}
.btn--ghost{background:transparent;color:var(--mist);border-color:rgba(245,247,248,.32)}
.btn--ghost:hover{background:rgba(255,255,255,.07);border-color:rgba(245,247,248,.62)}

/* ---------- 7. Page-level base components ---------- */
.breadcrumbs{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--slate)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs a{padding-bottom:1px;border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease)}
.breadcrumbs a:hover{color:var(--ink);border-bottom-color:var(--orange)}
.breadcrumbs [aria-current="page"]{color:var(--ink);font-weight:700}
.crumbs-sep{color:var(--rule-strong)}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--slate);
}
.eyebrow::before{content:"";width:24px;height:2px;background:var(--orange)}

.prose{max-width:70ch;font-size:16px;line-height:1.85;color:#20323B}
.prose p + p{margin-top:16px}
.prose h2{margin-top:36px;margin-bottom:12px;font-size:clamp(22px,2.4vw,28px)}
.prose h3{margin-top:26px;margin-bottom:8px;font-size:18px}
.prose ul{margin-top:12px}
.prose ul li{position:relative;padding-left:18px;margin-top:8px}
.prose ul li::before{content:"";position:absolute;left:0;top:.78em;width:8px;height:2px;background:var(--orange)}
.prose strong{font-weight:800;color:var(--ink)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
@media (min-width:768px){
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-8{grid-column:span 8}
  .col-12{grid-column:span 12}
}
@media (max-width:767px){
  .grid-12{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
  .grid-12 > *{grid-column:span 4}
}

.card{
  position:relative;
  background:var(--mist);
  border:1px solid var(--rule);border-radius:2px;
  padding:22px 22px 20px;
  transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:var(--rule-strong);box-shadow:0 12px 26px -20px rgba(11,31,42,.7)}
.card__title{font-size:19px;font-weight:800;letter-spacing:-.01em;line-height:1.4}
.card__meta{margin-top:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--slate)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--rule-strong);border-radius:2px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--slate);background:rgba(255,255,255,.55);
}
.tag--signal{color:#14512F;border-color:rgba(47,163,107,.5);background:rgba(47,163,107,.13)}
.tag--signal::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--signal);flex:0 0 auto}
.tag--wine{color:#fff;background:var(--wine);border-color:var(--wine)}
.tag--indigo{color:#fff;background:var(--indigo);border-color:var(--indigo)}

.media{position:relative;overflow:hidden;aspect-ratio:16 / 10;background:var(--fog);border:1px solid var(--rule);border-radius:2px}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:4 / 5}
.media--screen{
  aspect-ratio:16 / 9;
  background-color:#DCE5E8;
  background-image:
    linear-gradient(to right,rgba(11,31,42,.07) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(11,31,42,.07) 1px,transparent 1px);
  background-size:28px 28px;
}
.media__label{
  position:absolute;left:0;bottom:0;
  padding:5px 10px;
  background:rgba(11,31,42,.88);color:var(--mist);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
}

.annot{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--slate);
}
.ticks{
  height:10px;
  background-image:repeating-linear-gradient(90deg,var(--rule-strong) 0 1px,transparent 1px 14px);
  background-repeat:repeat-x;background-position:left center;
}

/* ---------- 8. Motion & accessibility ---------- */
:focus-visible{outline:2px solid var(--orange);outline-offset:3px}
html.js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
html.js [data-reveal="in"]{opacity:1;transform:none}

@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
}
@media (max-width:1023px){
  body{padding-top:var(--top-h)}
  .site-header{
    right:0;bottom:auto;width:auto;
    padding:0;
    border-right:0;
    border-bottom:1px solid rgba(245,247,248,.13);
  }
  .rail-head{height:var(--top-h);padding:0 16px;border-bottom:0}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:block;flex:0 0 auto;margin-top:0;
    max-height:0;opacity:0;visibility:hidden;
    padding:0 16px;overflow:hidden;
    border-top:1px solid transparent;
    transition:max-height .34s var(--ease),opacity .24s var(--ease),padding .34s var(--ease),visibility .24s var(--ease);
  }
  .site-nav[data-open]{
    max-height:min(76vh,600px);overflow-y:auto;
    opacity:1;visibility:visible;
    padding:14px 16px 20px;
    border-top-color:var(--rule-dark);
  }
  .nav-caption{margin-top:4px}
  .nav-link{padding:13px 8px 13px 12px}
  .nav-label{font-size:16px}
  .nav-actions{margin-top:18px;padding-top:0}
  .nav-meta{margin-top:14px}
  .rail-foot{display:none}
  .rail-progress{
    top:calc(var(--top-h) - 2px);left:0;right:0;
    width:auto;height:2px;
    transform:scaleX(var(--read-progress));
    transform-origin:left center;
  }
}
@media (max-width:900px){
  .foot-grid{grid-template-columns:1fr}
  .foot-col{padding:26px 0;border-left:0;border-top:1px solid var(--rule-dark)}
  .foot-col:first-child{border-top:0;padding-top:30px}
  .foot-col--contact{padding-bottom:34px}
  .foot-tag{max-width:40ch}
  .foot-base{padding-bottom:22px}
  .to-top{margin-left:0}
}

@media (prefers-reduced-motion:reduce){
  *,*::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;transform:none}
  .rail-progress{transition:none}
}