/* =============================================================
   优越会指定主站 — /assets/site.css
   共享外壳：重置 · 变量 · 中文排版 · 头部 · 页脚 · 通用组件
   ============================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:132px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

/* ---------- 2. Tokens ---------- */
:root{
  --ink-900:#0B1C2C;
  --ink-700:#16324B;
  --silver-050:#F2F4F7;
  --silver-300:#C7CDD6;
  --gray-600:#5C6773;
  --orange-500:#FF5A1F;
  --cyan-400:#12C8C8;
  --cyan-700:#0E8F8F;
  --amber-500:#C97A0A;
  --white:#FFFFFF;
  --metal:linear-gradient(135deg,#E7EBF0 0%,#B9C2CC 48%,#DDE3EA 100%);
  --line:1px solid var(--silver-300);
  --line-invert:1px solid rgba(199,205,214,.18);
  --shadow-1:0 1px 2px rgba(11,28,44,.07);
  --shadow-2:0 10px 26px -20px rgba(11,28,44,.55);
  --shell:1240px;
  --gut:clamp(1.05rem,4vw,2.5rem);
  --r:3px;
  --t:180ms cubic-bezier(.2,.7,.3,1);
  --font-head:"Oswald","Arial Narrow","Noto Sans SC","PingFang SC",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ---------- 3. Base / 中文排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:clamp(1rem,.35vw + .94rem,1.0625rem);
  line-height:1.75;
  color:var(--ink-900);
  background:var(--silver-050);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:700;line-height:.98;letter-spacing:-.008em;color:var(--ink-900)}
.display{font-family:var(--font-head);font-weight:700;font-size:clamp(2.6rem,7.2vw,5.5rem);line-height:.92;letter-spacing:-.02em}
.h2{font-size:clamp(1.7rem,3.4vw,2.75rem);line-height:.98}
.h3{font-size:clamp(1.2rem,1.9vw,1.625rem);line-height:1.1;font-weight:500}
.eyebrow{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--font-mono);font-size:.75rem;letter-spacing:.16em;text-transform:uppercase;color:var(--gray-600)}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--orange-500);flex:none}
.lede{font-size:clamp(1.05rem,1.35vw,1.25rem);line-height:1.7;color:var(--ink-700);max-width:38em}
.rule{height:1px;background:var(--silver-300);border:0;margin:0}
.prose{max-width:44em}
.prose p{max-width:40em;margin-bottom:1.1em}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin:1.7em 0 .6em}
.prose ul{margin:0 0 1.1em;display:grid;gap:.5em}
.prose li{position:relative;padding-left:1.15em;max-width:40em}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:7px;height:1.5px;background:var(--orange-500)}

/* ---------- 4. 布局容器 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gut)}
.shell--narrow{max-width:860px}
.section{padding-block:clamp(2.5rem,6vw,5rem)}
.section--tight{padding-block:clamp(1.5rem,3vw,2.5rem)}
.section--paper{background:var(--white)}
.section--ink{background:var(--ink-900);color:var(--silver-300)}
.section--ink h1,.section--ink h2,.section--ink h3,.section--ink h4,.section--ink .display{color:var(--white)}
.section--ink .lede,.section--ink .prose p{color:#C7CDD6}
.section--ink .eyebrow{color:#9FB0C0}
.section--ink .rule{background:rgba(199,205,214,.2)}

/* ---------- 5. 栅格 ---------- */
.grid{display:grid;gap:clamp(1.1rem,2.4vw,2rem)}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--8-4{grid-template-columns:8fr 4fr}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
@media (max-width:1023px){
  .grid--7-5,.grid--5-7,.grid--8-4{grid-template-columns:1fr}
}
@media (max-width:620px){
  .grid--2{grid-template-columns:1fr}
}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.45rem;
  font-family:var(--font-head);font-size:1rem;font-weight:500;letter-spacing:.02em;
  padding:.72rem 1.2rem;border:1px solid transparent;border-radius:var(--r);
  cursor:pointer;white-space:nowrap;
  transition:transform var(--t),background var(--t),color var(--t),border-color var(--t);
}
.btn--primary{background:var(--orange-500);color:var(--ink-900);font-weight:700}
.btn--primary:hover{background:#FF6E3A;transform:translateY(-2px)}
.btn--ghost{border-color:rgba(199,205,214,.45);color:var(--white);background:transparent}
.btn--ghost:hover{border-color:var(--cyan-400);color:var(--cyan-400);transform:translateY(-2px)}
.btn--line{border-color:var(--silver-300);background:var(--white);color:var(--ink-900)}
.btn--line:hover{border-color:var(--ink-900);transform:translateY(-2px)}
.btn--sm{padding:.5rem .85rem;font-size:.875rem}
.section--ink .btn--line{background:transparent;border-color:rgba(199,205,214,.35);color:var(--white)}

/* ---------- 7. 卡片 / 面板 ---------- */
.panel{background:var(--white);border:var(--line);border-radius:var(--r);box-shadow:var(--shadow-1);overflow:hidden}
.panel__head{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  background:var(--ink-700);color:var(--white);
  padding:.85rem 1.15rem;font-family:var(--font-head);font-size:1.0625rem;letter-spacing:.01em;
}
.panel__body{padding:1.15rem}
.panel--ink{background:var(--ink-900);border-color:rgba(199,205,214,.22);color:var(--silver-300)}
.panel--ink .panel__body{color:#C7CDD6}

/* ---------- 8. 数据锚点 / 数据条 ---------- */
.stat{
  display:flex;flex-direction:column;gap:.3rem;
  padding:1rem 1.1rem;background:var(--white);
  border:var(--line);border-left:3px solid var(--orange-500);border-radius:2px;
}
.stat__num{font-family:var(--font-mono);font-weight:600;font-size:clamp(2rem,4.4vw,3rem);line-height:1;letter-spacing:-.02em;color:var(--ink-900)}
.stat__unit{font-family:var(--font-mono);font-size:.85rem;font-weight:400;color:var(--gray-600);margin-left:.3rem}
.stat__label{font-size:.875rem;color:var(--gray-600)}
.section--ink .stat{background:#102439;border-color:rgba(199,205,214,.2);border-left-color:var(--orange-500)}
.section--ink .stat__num{color:var(--white)}
.section--ink .stat__label{color:#9FB0C0}

.meter{display:grid;gap:.45rem}
.meter__label{display:flex;justify-content:space-between;gap:1rem;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:var(--gray-600)}
.meter__track{height:10px;background:var(--silver-050);border:1px solid var(--silver-300);border-radius:99px;overflow:hidden}
.meter__fill{
  display:block;height:100%;width:var(--pct,0%);
  background:var(--metal);border-right:2px solid var(--orange-500);
  transition:width 420ms cubic-bezier(.2,.7,.3,1);
}
.section--ink .meter__label{color:#9FB0C0}
.section--ink .meter__track{background:rgba(255,255,255,.07);border-color:rgba(199,205,214,.24)}

/* ---------- 9. 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.4rem;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;
  padding:.22rem .55rem;border:1px solid var(--silver-300);border-radius:2px;
  background:var(--white);color:var(--gray-600);
}
.tag--cyan{border-color:var(--cyan-400);color:var(--cyan-700);background:rgba(18,200,200,.09)}
.tag--amber{border-color:var(--amber-500);color:var(--amber-500);background:rgba(201,122,10,.08)}
.tag--orange{border-color:var(--orange-500);color:var(--orange-500);background:rgba(255,90,31,.08)}

/* ---------- 10. 图片容器基础规则 ---------- */
.media{
  position:relative;overflow:hidden;border:var(--line);border-radius:var(--r);
  background:
    repeating-linear-gradient(135deg,rgba(11,28,44,.07) 0 1px,transparent 1px 10px),
    var(--metal);
}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media--ink{border-color:rgba(199,205,214,.22)}
.media__img{width:100%;height:100%;object-fit:cover}
.media__cap{
  position:absolute;left:0;right:0;bottom:0;
  padding:.55rem .75rem;background:rgba(11,28,44,.8);color:#E7EBF0;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;
}

/* ---------- 11. 折叠面板 ---------- */
.fold{background:var(--white);border:var(--line);border-radius:var(--r);margin-bottom:.6rem;overflow:hidden}
.fold__btn{
  width:100%;display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;
  text-align:left;padding:1rem 1.15rem;cursor:pointer;
  font-family:var(--font-head);font-size:1.0625rem;font-weight:500;color:var(--ink-900);
  transition:background var(--t);
}
.fold__btn:hover{background:var(--silver-050)}
.fold__icon{flex:none;font-family:var(--font-mono);color:var(--orange-500);transition:transform var(--t)}
.fold[data-open="true"] .fold__icon{transform:rotate(45deg)}
.fold__panel{padding:0 1.15rem 1.15rem;color:var(--gray-600);font-size:.95rem}
.fold__panel[hidden]{display:none}

/* ---------- 12. 面包屑 ---------- */
.crumbs{border-bottom:var(--line);background:var(--silver-050)}
.crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;padding-block:.8rem;
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.04em;color:var(--gray-600)}
.crumbs__sep{color:var(--silver-300)}
.crumbs__link{transition:color var(--t)}
.crumbs__link:hover{color:var(--orange-500)}
.crumbs__item[aria-current="page"]{color:var(--ink-900)}

/* ---------- 13. 头部 ---------- */
.skip-link{
  position:absolute;left:1rem;top:-120px;z-index:200;
  background:var(--orange-500);color:var(--ink-900);font-weight:700;font-size:.9rem;
  padding:.6rem 1rem;border-radius:2px;transition:top var(--t);
}
.skip-link:focus{top:.75rem}

.site-header{position:sticky;top:0;z-index:60;background:var(--ink-900);color:var(--white)}

.hdr-top{background:var(--ink-700);border-bottom:var(--line-invert)}
.hdr-top__inner{display:flex;align-items:center;gap:1rem;min-height:40px;padding-block:.28rem;flex-wrap:nowrap}
.brandline{display:inline-flex;align-items:center;gap:.5rem;font-size:.8rem;letter-spacing:.04em;color:#DCE3EB;white-space:nowrap;flex:none}
.brandline__dot{width:7px;height:7px;border-radius:50%;background:var(--cyan-400);box-shadow:0 0 0 3px rgba(18,200,200,.18);flex:none}
.hdr-top__note{flex:1 1 auto;min-width:0;font-size:.78rem;color:#9FB0C0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-align:center}
.hdr-top__hot{flex:none;margin-left:auto;font-family:var(--font-mono);font-size:.78rem;color:#DCE3EB;white-space:nowrap}
.hdr-top__tel{color:var(--cyan-400);letter-spacing:.06em}

.hdr-main{position:relative;border-bottom:var(--line-invert)}
.hdr-main__inner{display:flex;align-items:center;gap:1.15rem;min-height:74px;flex-wrap:nowrap}

.brand{display:flex;align-items:center;gap:.7rem;flex:none}
.brand__mark{
  width:34px;height:34px;flex:none;display:grid;place-items:center;border-radius:2px;
  background:var(--metal);border:1px solid rgba(11,28,44,.28);
  font-family:var(--font-mono);font-weight:700;font-size:1rem;color:var(--ink-900);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-family:var(--font-head);font-weight:700;font-size:1.12rem;letter-spacing:.02em;color:var(--white)}
.brand__sub{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.1em;color:#8FA3B5}
.hdr-slash{flex:none;width:2px;height:30px;background:var(--orange-500);transform:skewX(-18deg)}

.nav-toggle{
  display:none;align-items:center;gap:.55rem;margin-left:auto;
  padding:.5rem .7rem;border:1px solid rgba(199,205,214,.35);border-radius:2px;
  background:rgba(255,255,255,.04);color:var(--white);cursor:pointer;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.1em;
  transition:color var(--t),border-color var(--t);
}
.nav-toggle:hover{border-color:var(--cyan-400);color:var(--cyan-400)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:1.5px;background:currentColor;transition:transform var(--t),opacity var(--t)}
.nav-toggle[aria-expanded="true"]{border-color:var(--orange-500);color:var(--orange-500)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

.site-nav{margin-left:auto}
.site-nav__list{display:flex;align-items:center;gap:.2rem;flex-wrap:nowrap}
.site-nav__item{min-width:0}
.site-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:.4rem;
  padding:.85rem .5rem;font-size:.9rem;color:#C7D2DD;white-space:nowrap;
  transition:color var(--t);
}
.site-nav__idx{font-family:var(--font-mono);font-size:.66rem;color:var(--cyan-400);opacity:.8}
.site-nav__link::after{
  content:"";position:absolute;left:.5rem;right:.5rem;bottom:.3rem;height:2px;
  background:var(--orange-500);transform:scaleX(0);transform-origin:left;
  transition:transform var(--t);
}
.site-nav__link:hover{color:var(--white)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--white);font-weight:600}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__cta{display:none}

.hdr-cta{display:flex;align-items:center;gap:.5rem;margin-left:.4rem;flex:none}

.scroll-meter{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(199,205,214,.16);overflow:hidden}
.scroll-meter__fill{display:block;height:100%;width:var(--scroll,0%);background:linear-gradient(90deg,var(--cyan-400),var(--orange-500))}

/* ---------- 14. 页脚 ---------- */
.site-footer{
  position:relative;background:var(--ink-900);color:var(--silver-300);
  border-top:3px solid var(--orange-500);
  padding-top:clamp(2.25rem,5vw,4rem);padding-bottom:1.5rem;
}
.ftr-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:clamp(1.25rem,3vw,2.5rem)}
.ftr-brand__mark{font-family:var(--font-head);font-weight:700;font-size:1.4rem;color:var(--white);letter-spacing:.02em}
.ftr-brand__line{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.11em;color:var(--cyan-400);margin:.4rem 0 .85rem}
.ftr-brand__note{font-size:.875rem;line-height:1.7;color:#8FA3B5;max-width:32em}
.ftr-col__title{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;color:#8FA3B5;
  padding-bottom:.5rem;margin-bottom:.8rem;border-bottom:var(--line-invert);
}
.ftr-col__list{display:grid;gap:.5rem}
.ftr-link{font-size:.9rem;color:#C7D2DD;transition:color var(--t),padding-left var(--t)}
.ftr-link:hover{color:var(--orange-500);padding-left:.25rem}

.ftr-contact{margin-top:clamp(1.75rem,4vw,2.75rem);display:grid;gap:.2rem;max-width:760px}
.ftr-contact__row{display:flex;align-items:baseline;gap:.75rem;padding:.4rem 0;border-bottom:1px dashed rgba(199,205,214,.16)}
.ftr-contact__key{flex:none;min-width:4.4em;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;color:var(--cyan-400)}
.ftr-contact__val{font-size:.875rem;color:#DCE3EB;word-break:break-word}
.ftr-note{margin-top:.85rem;font-size:.78rem;line-height:1.7;color:#8FA3B5;max-width:46em}

.ftr-bottom{
  margin-top:clamp(1.75rem,4vw,3rem);padding-top:1.1rem;border-top:var(--line-invert);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem 1.25rem;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.04em;color:#8FA3B5;
}
.ftr-legal{display:flex;flex-wrap:wrap;gap:.35rem 1rem;margin:0}
.ftr-legal .ftr-link{padding-left:0;font-size:.74rem;color:#8FA3B5}
.ftr-legal .ftr-link:hover{color:var(--cyan-400);padding-left:0}

/* ---------- 15. 返回顶部 ---------- */
.to-top{
  position:fixed;right:clamp(.75rem,3vw,1.75rem);bottom:clamp(.75rem,3vw,1.75rem);z-index:65;
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.55rem .8rem;border:1px solid rgba(199,205,214,.3);border-radius:2px;
  background:var(--ink-900);color:var(--white);cursor:pointer;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;
  opacity:0;pointer-events:none;
  transition:opacity var(--t),transform var(--t),color var(--t),border-color var(--t);
}
.to-top[data-visible="true"]{opacity:1;pointer-events:auto}
.to-top:hover{border-color:var(--orange-500);color:var(--orange-500);transform:translateY(-2px)}

/* ---------- 16. 显现 ---------- */
[data-reveal]{opacity:0;transform:translateY(10px);transition:opacity 240ms ease,transform 240ms cubic-bezier(.2,.7,.3,1)}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 17. 焦点 ---------- */
:where(a,button,summary,[tabindex]):focus-visible{outline:2px solid var(--cyan-400);outline-offset:2px;border-radius:2px}

/* ---------- 18. 响应式：平板与手机 ---------- */
@media (max-width:1199px){
  .nav-toggle{display:inline-flex}
  .hdr-cta{display:none}
  .site-nav{
    position:fixed;left:0;right:0;bottom:0;z-index:80;margin-left:0;
    background:var(--ink-900);border-top:2px solid var(--orange-500);
    box-shadow:0 -20px 44px -26px rgba(11,28,44,.8);
    padding:.85rem var(--gut) calc(1rem + env(safe-area-inset-bottom));
    max-height:82vh;overflow-y:auto;
    transform:translateY(112%);transition:transform 220ms cubic-bezier(.2,.7,.3,1);
  }
  .site-nav[data-open="true"]{transform:translateY(0)}
  .site-nav__list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.4rem;align-items:stretch}
  .site-nav__link{
    display:flex;flex-direction:column;align-items:flex-start;gap:.12rem;width:100%;
    padding:.6rem .7rem;font-size:.9rem;
    background:rgba(255,255,255,.045);
    border:1px solid rgba(199,205,214,.16);border-left:3px solid transparent;border-radius:2px;
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{border-left-color:var(--orange-500);background:rgba(255,90,31,.1);color:var(--white)}
  .site-nav__cta{display:grid;grid-template-columns:1fr 1fr;gap:.5rem;margin-top:.85rem}
  .ftr-grid{grid-template-columns:1fr 1fr}
  .to-top{bottom:calc(1rem + env(safe-area-inset-bottom))}
}

@media (max-width:760px){
  .hdr-top__note{display:none}
  .hdr-top__hot{margin-left:auto}
  .hdr-main__inner{min-height:64px;gap:.75rem}
  .brand__sub{display:none}
  .brand__name{font-size:1rem}
  .hdr-slash{height:24px}
  .ftr-grid{grid-template-columns:1fr;gap:1.75rem}
  .ftr-contact__row{flex-direction:column;gap:.15rem}
  .ftr-contact__key{min-width:0}
  .ftr-bottom{flex-direction:column;align-items:flex-start}
}

@media (max-width:420px){
  .site-nav__list{grid-template-columns:1fr}
  .site-nav__cta{grid-template-columns:1fr}
}

/* ---------- 19. 降低动效 ---------- */
@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}
  .meter__fill{transition:none}
  .site-nav{transition:none}
}