/* /assets/site.css — 欧博 ABG HOME 共享外壳与通用组件 */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --bg:#060B1A;
  --panel:#0D1530;
  --float:#131C3D;
  --line:#26325F;
  --gold:#F2C14E;
  --violet:#7B5CFF;
  --cyan:#28E0C8;
  --text:#E8ECF8;
  --muted:#9AA6C9;
  --coral:#FF7A59;
  --dim:#55639A;

  --rail-w:252px;
  --bar-h:66px;
  --gutter:clamp(18px,3.2vw,40px);
  --r-sm:8px;
  --r-md:12px;
  --r-lg:18px;
  --ease:cubic-bezier(.22,.7,.28,1);
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --scroll-progress:0;
}

/* ---------- 2. Reset 与中文排版 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  padding-left:var(--rail-w);
  padding-top:var(--bar-h);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background-color:var(--bg);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(760px 460px at 84% 2%, rgba(123,92,255,.26), transparent 66%),
    radial-gradient(640px 420px at 4% 0%, rgba(40,224,200,.10), transparent 64%),
    radial-gradient(900px 520px at 64% 106%, rgba(242,193,78,.10), transparent 68%);
}
body.nav-open{overflow:hidden}

h1,h2,h3,h4{margin:0;font-weight:300;letter-spacing:.03em;line-height:1.16;color:var(--text)}
h3,h4{font-weight:600;letter-spacing:.02em;line-height:1.4}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0 0 1em;padding-left:1.2em}
a{color:var(--text)}
a:hover{color:var(--gold)}
img,svg,video{max-width:100%}
button{font:inherit}
::selection{background:rgba(123,92,255,.45);color:#fff}

:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.mono{font-family:var(--mono);letter-spacing:.04em}
.num{font-family:var(--mono);color:var(--gold);font-weight:600}
.text-muted{color:var(--muted)}

.skip-link{
  position:fixed;
  top:10px;left:50%;
  transform:translate(-50%,-180%);
  z-index:200;
  padding:10px 18px;
  border-radius:999px;
  background:var(--gold);
  color:#0A0F22;
  font-size:14px;
  font-weight:600;
  text-decoration:none;
  transition:transform .2s var(--ease);
}
.skip-link:focus-visible{transform:translate(-50%,0);color:#0A0F22}

/* ---------- 3. 通用容器与网格 ---------- */
.wrap{width:min(calc(100% - var(--gutter) * 2),1280px);margin-inline:auto}
.section{padding:clamp(44px,6vw,92px) 0}
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,4fr)}
.grid--rail{grid-template-columns:minmax(0,2fr) minmax(0,7fr) minmax(0,3fr)}

.display{font-size:clamp(40px,5.4vw,88px);font-weight:200;letter-spacing:.03em;line-height:1.08}
.lede{font-size:18px;line-height:1.75;color:#C6CFE9;max-width:62ch}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted)}
.eyebrow--gold{color:var(--gold)}
.eyebrow--cyan{color:var(--cyan)}
.eyebrow--violet{color:#B9A7FF}

.divider{height:1px;border:0;margin:clamp(28px,4vw,48px) 0;background:linear-gradient(90deg,transparent,var(--line) 12%,rgba(123,92,255,.5) 50%,var(--line) 88%,transparent)}

/* ---------- 4. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:14px;font-weight:600;letter-spacing:.03em;line-height:1.2;
  text-decoration:none;cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s,border-color .2s,box-shadow .2s,filter .2s;
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{
  background:linear-gradient(120deg,#7B5CFF,#4A2FCC);
  color:#F4F3FF;
  box-shadow:0 14px 30px -16px rgba(123,92,255,.95);
}
.btn--primary:hover{color:#fff;filter:brightness(1.08)}
.btn--ghost{
  background:rgba(19,28,61,.7);
  border-color:var(--line);
  color:var(--text);
}
.btn--ghost:hover{border-color:rgba(242,193,78,.55);color:var(--gold)}
.btn--sm{padding:8px 15px;font-size:13px}

/* ---------- 5. 头部框架：顶栏 + 坐标索引栏 ---------- */
.site-header{position:relative;z-index:70}

.scroll-trace{position:fixed;top:0;left:0;right:0;height:2px;z-index:90;pointer-events:none;background:transparent}
.scroll-trace__fill{
  display:block;height:100%;
  width:calc(var(--scroll-progress,0) * 100%);
  background:linear-gradient(90deg,var(--cyan),var(--violet) 55%,var(--gold));
  box-shadow:0 0 14px rgba(123,92,255,.75);
  transition:width .12s linear;
}

.header-bar{
  position:fixed;top:0;left:0;right:0;
  height:var(--bar-h);
  z-index:70;
  display:flex;align-items:center;gap:16px;
  padding:0 20px;
  background:linear-gradient(180deg,rgba(6,11,26,.97),rgba(6,11,26,.86));
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.header-bar::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(123,92,255,.75) 18%,rgba(40,224,200,.5) 52%,rgba(242,193,78,.6) 82%,transparent);
}

.brand{
  display:flex;align-items:center;gap:12px;
  flex:0 0 auto;
  width:calc(var(--rail-w) - 20px);
  margin-right:auto;
  text-decoration:none;color:var(--text);
}
.brand__glyph{
  display:grid;place-items:center;
  width:32px;height:32px;flex:0 0 32px;
  border-radius:9px;
  background:linear-gradient(135deg,var(--violet),var(--gold));
  color:#0A0F22;
  font-family:var(--mono);font-size:10px;font-weight:700;letter-spacing:0;
}
.brand__text{display:flex;flex-direction:column;min-width:0}
.brand__name{font-size:15px;font-weight:600;letter-spacing:.05em;line-height:1.25;white-space:nowrap}
.brand__sub{font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--muted);line-height:1.3;white-space:nowrap}

.path-hint{display:flex;align-items:center;gap:10px;margin:0;font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--muted)}
.path-hint__step{color:#C6CFE9}
.path-hint__arrow{color:var(--gold)}

.header-actions{display:flex;align-items:center;gap:10px;margin-left:28px;flex:0 0 auto}

.nav-toggle{
  display:none;
  flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:44px;padding:0 11px;
  background:rgba(19,28,61,.75);
  border:1px solid var(--line);
  border-radius:11px;
  cursor:pointer;
}
.nav-toggle__bar{display:block;height:2px;border-radius:2px;background:var(--text);transition:transform .22s var(--ease),opacity .18s linear}
.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)}

.nav-rail{
  position:fixed;top:var(--bar-h);left:0;bottom:0;
  width:var(--rail-w);
  z-index:65;
  display:flex;flex-direction:column;gap:16px;
  padding:26px 16px 20px 20px;
  overflow-y:auto;
  border-right:1px solid var(--line);
  background-color:var(--bg);
  background-image:
    repeating-linear-gradient(180deg,rgba(38,50,95,.32) 0 1px,transparent 1px 34px),
    linear-gradient(180deg,rgba(13,21,48,.95),rgba(6,11,26,.98));
}
.nav-rail::after{
  content:"";position:absolute;top:0;right:-1px;bottom:0;width:1px;
  background:linear-gradient(180deg,rgba(242,193,78,.55),rgba(123,92,255,.35) 42%,transparent 88%);
}
.nav-rail__label{
  display:flex;align-items:center;gap:10px;margin:0;
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);
}
.nav-rail__label::after{content:"";flex:1;height:1px;background:var(--line)}

.rail-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.rail-item{margin:0}
.rail-link{
  position:relative;
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 12px;
  padding:11px 12px;
  border:1px solid transparent;
  border-radius:10px;
  text-decoration:none;
  color:var(--muted);
  transition:background-color .2s,border-color .2s,color .2s;
}
.rail-link__idx{font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--dim);transition:color .2s}
.rail-link__text{font-size:15px;letter-spacing:.03em}
.rail-link__hint{
  grid-column:2;
  max-height:0;overflow:hidden;opacity:0;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;color:var(--muted);
  transition:max-height .24s var(--ease),opacity .24s var(--ease);
}
.rail-link:hover,.rail-link:focus-visible{color:var(--text);background:rgba(19,28,61,.8);border-color:var(--line)}
.rail-link:hover .rail-link__idx,.rail-link:focus-visible .rail-link__idx{color:var(--cyan)}
.rail-link:hover .rail-link__hint,.rail-link:focus-visible .rail-link__hint{max-height:22px;opacity:1}
.rail-link[aria-current="page"]{
  color:var(--text);
  background:linear-gradient(90deg,rgba(242,193,78,.16),rgba(123,92,255,.10));
  border-color:rgba(242,193,78,.42);
}
.rail-link[aria-current="page"]::before{
  content:"";position:absolute;left:-1px;top:9px;bottom:9px;width:2px;border-radius:2px;background:var(--gold);
}
.rail-link[aria-current="page"] .rail-link__idx{color:var(--gold)}

.rail-foot{
  margin-top:auto;
  display:flex;flex-direction:column;gap:6px;
  padding-top:16px;
  border-top:1px solid var(--line);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.06em;color:var(--muted);
}
.rail-foot__mail{color:#C6CFE9;word-break:break-all}

.nav-scrim{display:none}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  padding:clamp(36px,5vw,64px) 0 26px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(6,11,26,.35),rgba(13,21,48,.9));
}
.footer-trace{
  position:absolute;top:-1px;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(242,193,78,.7) 20%,rgba(123,92,255,.7) 55%,rgba(40,224,200,.55) 84%,transparent);
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,0.9fr) minmax(0,1.6fr);
  gap:clamp(20px,3vw,40px);
}
.footer-brand__name{margin:0;font-size:18px;font-weight:600;letter-spacing:.06em}
.footer-brand__sub{margin:6px 0 0;font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--muted)}
.footer-brand__line{margin:14px 0 0;font-size:14px;color:var(--muted);max-width:28ch}
.footer-col__title{
  margin:0 0 14px;
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);
}
.footer-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.footer-link{font-size:14.5px;text-decoration:none;color:#C6CFE9;transition:color .2s}
.footer-link:hover{color:var(--gold)}
.footer-contact{display:flex;gap:10px;margin:0 0 9px;font-size:14px;color:var(--muted)}
.footer-contact__key{flex:0 0 34px;font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--dim);padding-top:2px}
.footer-contact__val{color:#C6CFE9;word-break:break-word}
.footer-legal{
  display:flex;flex-wrap:wrap;gap:8px 26px;justify-content:space-between;align-items:baseline;
  margin-top:clamp(28px,4vw,48px);
  padding-top:20px;
  border-top:1px solid var(--line);
  font-family:var(--mono);font-size:12px;letter-spacing:.05em;color:var(--muted);
}
.footer-legal__icp{color:#7C89B4}
.footer-legal__copy{font-family:var(--sans);font-size:12.5px;letter-spacing:.02em}

.to-top{
  position:fixed;right:22px;bottom:22px;
  z-index:60;
  padding:0 16px;height:44px;
  border-radius:12px;
  border:1px solid var(--line);
  background:rgba(19,28,61,.9);
  color:var(--gold);
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;
  cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:rgba(242,193,78,.55)}

/* ---------- 7. 通用内容组件 ---------- */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin:0;padding:26px 0 0;list-style:none;
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--muted);
}
.breadcrumbs__item a{color:var(--muted);text-decoration:none}
.breadcrumbs__item a:hover{color:var(--gold)}
.breadcrumbs__item[aria-current="page"]{color:var(--gold)}
.breadcrumbs__sep{color:var(--dim)}

.panel{
  position:relative;
  padding:clamp(22px,3vw,40px);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(13,21,48,.75),rgba(9,15,36,.55));
  box-shadow:0 30px 70px -50px rgba(0,0,0,.95);
}
.panel::before{
  content:"";position:absolute;left:24px;right:24px;top:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(242,193,78,.55),rgba(123,92,255,.5),transparent);
}
.panel + .panel{margin-top:clamp(18px,2.6vw,32px)}
.panel__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:12px 18px;margin-bottom:18px}
.panel__idx{font-family:var(--mono);font-size:11px;letter-spacing:.24em;color:var(--gold)}
.panel__title{font-size:clamp(24px,2.6vw,32px);font-weight:300;letter-spacing:.04em}

.steps{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.step{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:6px 16px;align-items:start;
  padding:16px 18px;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:rgba(13,21,48,.55);
}
.step__no{font-family:var(--mono);font-size:18px;font-weight:700;color:var(--gold);line-height:1.4}
.step__title{margin:0 0 4px;font-size:17px;font-weight:600}
.step__body{margin:0;font-size:15.5px;color:#C6CFE9}

.tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(19,28,61,.6);
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--muted);
}
.tag--gold{color:var(--gold);border-color:rgba(242,193,78,.42)}
.tag--cyan{color:var(--cyan);border-color:rgba(40,224,200,.42)}
.tag--violet{color:#B9A7FF;border-color:rgba(123,92,255,.45)}
.tag--coral{color:var(--coral);border-color:rgba(255,122,89,.45)}

.callout{
  padding:14px 18px;
  border:1px solid var(--line);
  border-left:2px solid var(--cyan);
  border-radius:0 var(--r-md) var(--r-md) 0;
  background:rgba(19,28,61,.6);
  font-size:15px;color:#C6CFE9;
}
.callout--gold{border-left-color:var(--gold)}
.callout--warn{border-left-color:var(--coral)}
.callout__title{display:block;margin-bottom:4px;font-size:14px;font-weight:600;letter-spacing:.04em;color:var(--text)}

.fold{
  padding:0 16px;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:rgba(13,21,48,.5);
}
.fold + .fold{margin-top:10px}
.fold__summary{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:14px 0;
  cursor:pointer;list-style:none;
  font-size:15.5px;font-weight:600;color:var(--text);
}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary::after{content:"+";font-family:var(--mono);font-size:16px;color:var(--gold)}
.fold[open] .fold__summary::after{content:"–"}
.fold__body{padding:0 0 16px;font-size:15px;color:#C6CFE9}

.tabs{--tabs-gap:6px}
.tabs__list{
  display:inline-flex;flex-wrap:wrap;gap:var(--tabs-gap);
  max-width:100%;padding:6px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(19,28,61,.65);
}
.tabs__btn{
  padding:8px 16px;
  border:0;border-radius:999px;
  background:transparent;
  color:var(--muted);
  font-size:13.5px;font-weight:600;letter-spacing:.04em;
  cursor:pointer;
  transition:background-color .2s,color .2s,box-shadow .2s;
}
.tabs__btn:hover{color:var(--text)}
.tabs__btn[aria-selected="true"]{
  background:linear-gradient(120deg,rgba(123,92,255,.95),rgba(74,47,204,.95));
  color:#F4F3FF;
  box-shadow:0 12px 26px -16px rgba(123,92,255,.95);
}
.tabs__panel{padding-top:22px}
.tabs__panel[hidden]{display:none}
[data-tabs] .tabs__panel:not([hidden]){animation:panelIn .26s var(--ease) both}
@keyframes panelIn{from{opacity:0;transform:translateX(16px)}to{opacity:1;transform:none}}

.media-frame{
  position:relative;overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:linear-gradient(135deg,#0D1530,#131C3D 46%,rgba(123,92,255,.2));
  aspect-ratio:16/9;
}
.media-frame img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(115deg,transparent 30%,rgba(123,92,255,.16) 50%,transparent 70%);
}
.media-frame__note{
  position:absolute;left:12px;bottom:10px;z-index:1;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:var(--muted);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}

[data-reveal]{opacity:0;transform:translateY(8px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-reveal].is-visible{opacity:1;transform:none}
html:not(.js) [data-reveal]{opacity:1;transform:none}

/* ---------- 8. 响应式 ---------- */
@media (max-width:1279px){
  :root{--rail-w:222px}
  .path-hint{display:none}
}
@media (max-width:1023px){
  :root{--bar-h:60px}
  body{padding-left:0}
  .brand{width:auto;gap:10px}
  .header-actions{margin-left:auto}
  .nav-toggle{display:flex}
  .nav-rail{
    top:var(--bar-h);bottom:0;
    width:min(84vw,318px);
    z-index:66;
    transform:translateX(-104%);
    transition:transform .3s var(--ease);
    box-shadow:28px 0 70px -40px #000;
  }
  .nav-rail[data-open="true"]{transform:translateX(0)}
  .nav-scrim{
    display:block;position:fixed;inset:0;z-index:64;
    background:rgba(4,7,17,.64);
    backdrop-filter:blur(3px);
    opacity:0;visibility:hidden;
    transition:opacity .28s var(--ease),visibility .28s;
  }
  .nav-rail[data-open="true"] ~ .nav-scrim{opacity:1;visibility:visible}
  .grid--2,.grid--3,.grid--split,.grid--rail{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:767px){
  body{font-size:15.5px}
  .display{font-size:clamp(32px,9vw,48px)}
  .header-actions .btn--ghost{display:none}
  .media-frame--wide{aspect-ratio:16/9}
  .media-frame--tall{aspect-ratio:3/4}
  .tabs__list{border-radius:14px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-legal{flex-direction:column;gap:8px}
  .to-top{right:14px;bottom:14px}
}
@media (max-width:420px){
  .brand__sub{display:none}
  .brand__glyph{width:28px;height:28px;flex-basis:28px;font-size:9px}
}

/* ---------- 9. 动效降级 ---------- */
@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}
  .scroll-trace__fill{transition:none}
}