/* ==========================================================
   BSPORTS赛场 · 全站共享样式 /assets/site.css
   夜间赛场数据舱：午夜蓝底 + 荧光青 + 信号橙 + 渐变紫
   负责：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ========================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;background:#0A1020;}
body,h1,h2,h3,h4,h5,h6,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%;height:auto;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;padding:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}
hr{border:0;height:1px;background:var(--bs-line);}
[hidden]{display:none !important;}

/* ---------- 2. 变量 ---------- */
:root{
  --bs-midnight:#0A1020;
  --bs-midnight-deep:#060B16;
  --bs-midnight-soft:#101A33;
  --bs-ink:#1A1614;
  --bs-cream:#F4EBDD;
  --bs-cyan:#4DF0E0;
  --bs-orange:#FF6A2B;
  --bs-red:#E2452B;
  --bs-violet-1:#7B4DFF;
  --bs-violet-2:#C04DFF;
  --bs-glass:#2A3550;
  --bs-mist:#B8FFF8;

  --bs-text:#EFE6D8;
  --bs-text-soft:rgba(244,235,221,.74);
  --bs-text-faint:rgba(244,235,221,.52);
  --bs-ink-soft:rgba(26,22,20,.76);
  --bs-line:rgba(184,255,248,.16);
  --bs-line-strong:rgba(184,255,248,.34);
  --bs-line-ink:rgba(26,22,20,.14);

  --bs-font-display:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --bs-font-body:var(--bs-font-display);
  --bs-font-mono:"JetBrains Mono","Roboto Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --bs-wrap:1280px;
  --bs-gutter:clamp(18px,4vw,56px);
  --bs-header-h:76px;
  --bs-radius:18px;
  --bs-radius-lg:28px;
  --bs-section-y:clamp(56px,8vw,112px);
  --bs-shadow:0 28px 70px -34px rgba(0,0,0,.9);
}

/* ---------- 3. 中文排版与底色 ---------- */
body{
  background:transparent;
  color:var(--bs-text);
  font-family:var(--bs-font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.9;
  letter-spacing:.004em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(780px 440px at 84% -8%, rgba(123,77,255,.22), transparent 70%),
    radial-gradient(640px 400px at 4% 6%, rgba(77,240,224,.11), transparent 72%),
    linear-gradient(180deg,#0A1020 0%,#0A1020 58%,#080D1B 100%);
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  opacity:.55;
  background-image:
    linear-gradient(rgba(184,255,248,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(184,255,248,.045) 1px,transparent 1px);
  background-size:88px 88px;
  -webkit-mask-image:radial-gradient(125% 92% at 50% 0%,#000 0%,transparent 78%);
  mask-image:radial-gradient(125% 92% at 50% 0%,#000 0%,transparent 78%);
}
body.bs-nav-open{overflow:hidden;}

h1,h2,h3,h4{font-weight:300;line-height:1.16;letter-spacing:-.015em;color:var(--bs-text);}
p{max-width:78ch;}
strong,b{font-weight:600;color:#FFF9EF;}
::selection{background:rgba(77,240,224,.32);color:#FFFFFF;}

:focus-visible{outline:2px solid var(--bs-cyan);outline-offset:3px;border-radius:6px;}

/* ---------- 4. 跳转与容器 ---------- */
.bs-skip{
  position:fixed;left:16px;top:-120px;z-index:200;
  padding:10px 20px;border-radius:999px;
  background:var(--bs-cyan);color:#06131A;
  font-size:14px;font-weight:600;letter-spacing:.02em;
  transition:top .22s ease;
}
.bs-skip:focus{top:14px;}

.bs-container{
  width:100%;
  max-width:var(--bs-wrap);
  margin-inline:auto;
  padding-inline:var(--bs-gutter);
}

/* ---------- 5. 排版组件 ---------- */
.bs-eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-size:12.5px;letter-spacing:.08em;line-height:1.4;
  color:var(--bs-cyan);
}
.bs-eyebrow::before{
  content:"";width:7px;height:7px;border-radius:50%;
  background:var(--bs-orange);box-shadow:0 0 12px rgba(255,106,43,.9);
  flex:0 0 auto;
}
.bs-display{
  font-family:var(--bs-font-display);
  font-weight:200;
  font-size:clamp(46px,8vw,124px);
  line-height:1.02;
  letter-spacing:-.022em;
  color:#FFF9EF;
}
.bs-display--xl{font-size:clamp(66px,13vw,168px);letter-spacing:-.03em;}
.bs-title{
  font-weight:300;
  font-size:clamp(26px,3.4vw,50px);
  line-height:1.14;
  letter-spacing:-.012em;
  color:#FFF9EF;
}
.bs-subtitle{font-weight:400;font-size:clamp(18px,2vw,24px);line-height:1.5;color:var(--bs-text);}
.bs-lede{font-size:clamp(16px,1.55vw,19px);line-height:1.9;color:var(--bs-text-soft);}
.bs-muted{font-size:13.5px;line-height:1.8;color:var(--bs-text-faint);}
.bs-num{
  font-family:var(--bs-font-mono);
  font-weight:700;
  letter-spacing:-.02em;
  color:var(--bs-cyan);
  font-variant-numeric:tabular-nums;
}
.bs-num--orange{color:var(--bs-orange);}
.bs-num--violet{color:#D7A9FF;}
.bs-rule{
  height:1px;width:100%;border:0;margin:0;
  background:linear-gradient(90deg,var(--bs-cyan),rgba(77,240,224,.12) 46%,transparent);
}

.bs-breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-size:12.5px;letter-spacing:.06em;color:var(--bs-text-faint);
}
.bs-breadcrumb li{display:inline-flex;align-items:center;gap:10px;}
.bs-breadcrumb li:not(:last-child)::after{content:"/";color:rgba(184,255,248,.35);}
.bs-breadcrumb a{color:var(--bs-text-soft);transition:color .2s ease;}
.bs-breadcrumb a:hover{color:var(--bs-cyan);}
.bs-breadcrumb [aria-current="page"]{color:var(--bs-cyan);}

/* ---------- 6. 布局组件 ---------- */
.bs-section{padding-block:var(--bs-section-y);position:relative;}
.bs-section--tight{padding-block:clamp(36px,5vw,64px);}
.bs-section--cream{
  background:var(--bs-cream);
  color:var(--bs-ink);
}
.bs-section--cream .bs-title,
.bs-section--cream h1,
.bs-section--cream h2,
.bs-section--cream h3{color:var(--bs-ink);}
.bs-section--cream .bs-lede{color:var(--bs-ink-soft);}
.bs-section--cream .bs-muted{color:rgba(26,22,20,.6);}
.bs-section--cream .bs-eyebrow{color:var(--bs-red);}
.bs-section--cream .bs-eyebrow::before{background:var(--bs-red);box-shadow:none;}
.bs-section--cream .bs-rule{background:linear-gradient(90deg,var(--bs-red),rgba(226,69,43,.12) 46%,transparent);}
.bs-section--cream .bs-num{color:#0F5C55;}
.bs-section--cream .bs-card--cream{border-color:rgba(26,22,20,.16);}
.bs-page-head{
  padding-top:calc(var(--bs-header-h) + clamp(46px,7vw,104px));
  padding-bottom:clamp(30px,4vw,58px);
  position:relative;
}
.bs-stack>*+*{margin-top:var(--bs-stack,18px);}

.bs-grid{display:grid;gap:clamp(18px,2.4vw,32px);}
.bs-grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.bs-grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.bs-grid--4{grid-template-columns:repeat(4,minmax(0,1fr));}

/* ---------- 7. 头部 ---------- */
.bs-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:60;
  background:linear-gradient(180deg,rgba(10,16,32,.72),rgba(10,16,32,0));
  border-bottom:1px solid transparent;
  transition:background .34s ease,border-color .34s ease,backdrop-filter .34s ease;
}
.bs-header[data-solid="true"]{
  background:rgba(10,16,32,.94);
  border-bottom-color:var(--bs-line);
  -webkit-backdrop-filter:blur(16px) saturate(1.2);
  backdrop-filter:blur(16px) saturate(1.2);
}
.bs-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(184,255,248,.08);
  overflow:hidden;pointer-events:none;
}
.bs-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--bs-cyan),var(--bs-orange) 62%,var(--bs-violet-2));
}
.bs-header__inner{
  display:flex;
  align-items:center;
  gap:clamp(14px,2.4vw,34px);
  height:var(--bs-header-h);
}
.bs-brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto;}
.bs-brand__glyph{
  position:relative;
  width:36px;height:36px;flex:0 0 auto;
  border-radius:11px;
  background:linear-gradient(135deg,var(--bs-cyan),var(--bs-violet-1) 78%);
  box-shadow:0 0 24px -6px rgba(77,240,224,.85);
}
.bs-brand__glyph::before{
  content:"";position:absolute;left:7px;right:7px;top:50%;
  height:1.5px;background:rgba(10,16,32,.72);
}
.bs-brand__glyph::after{
  content:"";position:absolute;left:50%;top:7px;bottom:7px;
  width:1.5px;background:rgba(10,16,32,.4);
}
.bs-brand__text{display:flex;flex-direction:column;line-height:1.15;}
.bs-brand__mark{font-size:17px;font-weight:600;letter-spacing:.02em;color:#FFF9EF;}
.bs-brand__sub{
  margin-top:3px;
  font-family:var(--bs-font-mono);
  font-size:10.5px;letter-spacing:.22em;color:rgba(184,255,248,.72);
}

.bs-nav{flex:1 1 auto;display:flex;justify-content:center;}
.bs-nav__group{display:flex;align-items:center;gap:clamp(12px,1.7vw,28px);}
.bs-nav__link{
  position:relative;display:inline-block;
  padding:8px 2px;
  font-size:14.5px;letter-spacing:.01em;
  color:var(--bs-text-soft);
  transition:color .22s ease;
  white-space:nowrap;
}
.bs-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--bs-cyan),var(--bs-orange));
  transform:scaleX(0);transform-origin:left;
  transition:transform .3s cubic-bezier(.22,.61,.36,1);
}
.bs-nav__link:hover{color:#FFF9EF;}
.bs-nav__link:hover::after{transform:scaleX(.62);}
.bs-nav__link[aria-current="page"]{color:var(--bs-cyan);}
.bs-nav__link[aria-current="page"]::after{transform:scaleX(1);}

.bs-nav__foot{display:none;}

.bs-header__actions{display:flex;align-items:center;flex:0 0 auto;}

.bs-cta{
  display:inline-flex;align-items:center;gap:9px;
  padding:11px 20px;
  border-radius:999px;
  font-size:14px;font-weight:600;letter-spacing:.02em;
  color:#120A05;
  background:linear-gradient(118deg,var(--bs-orange),var(--bs-red) 60%,var(--bs-violet-2) 145%);
  box-shadow:0 0 0 1px rgba(255,106,43,.34),0 16px 36px -18px rgba(255,106,43,.95);
  transition:transform .24s ease,box-shadow .24s ease,filter .24s ease;
  white-space:nowrap;
}
.bs-cta::after{content:"→";font-family:var(--bs-font-mono);font-size:13px;line-height:1;}
.bs-cta:hover{transform:translateY(-2px);filter:saturate(1.08);box-shadow:0 0 0 1px rgba(255,106,43,.6),0 22px 44px -18px rgba(255,106,43,1);}

.bs-nav-toggle{
  display:none;
  align-items:center;gap:9px;
  margin-left:auto;
  padding:9px 14px;
  border:1px solid var(--bs-line-strong);
  border-radius:999px;
  background:rgba(42,53,80,.5);
  color:var(--bs-mist);
  font-size:12.5px;letter-spacing:.08em;
  transition:border-color .22s ease,background .22s ease;
}
.bs-nav-toggle:hover{border-color:var(--bs-cyan);}
.bs-nav-toggle__bars{display:inline-grid;gap:4px;width:16px;}
.bs-nav-toggle__bars i{display:block;height:1.5px;border-radius:2px;background:var(--bs-cyan);transition:transform .26s ease,opacity .26s ease;}
.bs-nav-toggle[aria-expanded="true"] .bs-nav-toggle__bars i:nth-child(1){transform:translateY(5.5px) rotate(45deg);}
.bs-nav-toggle[aria-expanded="true"] .bs-nav-toggle__bars i:nth-child(2){opacity:0;}
.bs-nav-toggle[aria-expanded="true"] .bs-nav-toggle__bars i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg);}

/* ---------- 8. 页脚 ---------- */
.bs-footer{
  position:relative;
  margin-top:clamp(40px,6vw,96px);
  padding-top:clamp(48px,6vw,88px);
  background:linear-gradient(180deg,rgba(6,11,22,.35),#060B16 58%);
  border-top:1px solid var(--bs-line);
  overflow:hidden;
}
.bs-footer__trace{
  position:absolute;left:0;right:0;top:0;height:190px;
  pointer-events:none;opacity:.7;
  background:
    linear-gradient(90deg,transparent,rgba(77,240,224,.7) 50%,transparent) top/100% 1px no-repeat,
    repeating-linear-gradient(90deg,rgba(184,255,248,.07) 0 1px,transparent 1px 68px);
}
.bs-footer__inner{
  position:relative;
  display:grid;
  grid-template-columns:1.5fr 1fr .8fr 1.5fr;
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(34px,5vw,64px);
}
.bs-footer__brandname{
  display:inline-block;
  font-size:20px;font-weight:600;letter-spacing:.02em;color:#FFF9EF;
  transition:color .2s ease;
}
.bs-footer__brandname:hover{color:var(--bs-cyan);}
.bs-footer__tagline{
  margin-top:10px;
  font-size:13.5px;line-height:1.8;color:var(--bs-cyan);letter-spacing:.02em;
}
.bs-footer__note{
  margin-top:12px;
  font-size:13px;line-height:1.85;color:var(--bs-text-faint);max-width:38ch;
}
.bs-footer__halfcourt{
  display:block;
  width:100%;max-width:230px;height:66px;
  margin-top:24px;
  border:1px solid var(--bs-line);
  border-top:0;
  border-radius:0 0 130px 130px / 0 0 66px 66px;
  position:relative;
}
.bs-footer__halfcourt::before{
  content:"";position:absolute;left:50%;top:0;bottom:24px;width:1px;
  background:var(--bs-line-strong);
}
.bs-footer__halfcourt::after{
  content:"";position:absolute;left:50%;top:0;width:58px;height:30px;
  border:1px solid var(--bs-line-strong);border-top:0;
  border-radius:0 0 58px 58px / 0 0 30px 30px;
  transform:translateX(-50%);
}
.bs-footer__col{min-width:0;}
.bs-footer__title{
  font-family:var(--bs-font-mono);
  font-size:11.5px;font-weight:700;letter-spacing:.16em;
  color:rgba(184,255,248,.7);
  padding-bottom:14px;
  border-bottom:1px solid var(--bs-line);
  margin-bottom:14px;
}
.bs-footer__list{display:grid;gap:2px;}
.bs-footer__link{
  display:inline-block;
  padding:6px 0;
  font-size:14px;color:var(--bs-text-soft);
  transition:color .2s ease,transform .2s ease;
}
.bs-footer__link:hover{color:var(--bs-cyan);transform:translateX(3px);}

.bs-footer__contact{display:grid;gap:14px;}
.bs-contact-line{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:4px 12px;
  align-items:start;
  font-size:13.5px;
  line-height:1.75;
}
.bs-contact-line__key{
  font-family:var(--bs-font-mono);
  font-size:11px;letter-spacing:.14em;
  color:rgba(184,255,248,.62);
  padding-top:3px;
}
.bs-contact-line__val{color:var(--bs-text-soft);word-break:break-word;}
.bs-contact-line .bs-copy{grid-column:2;justify-self:start;margin-top:6px;}

.bs-copy{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 11px;
  border:1px solid var(--bs-line-strong);
  border-radius:999px;
  font-family:var(--bs-font-mono);
  font-size:11.5px;letter-spacing:.08em;
  color:var(--bs-cyan);
  transition:background .2s ease,border-color .2s ease,color .2s ease;
  white-space:nowrap;
}
.bs-copy:hover{background:rgba(77,240,224,.14);}
.bs-copy[data-copied="true"]{border-color:var(--bs-orange);color:var(--bs-orange);}

.bs-footer__base{
  position:relative;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 26px;
  padding-top:22px;padding-bottom:30px;
  border-top:1px dashed rgba(184,255,248,.18);
}
.bs-footer__icp,
.bs-footer__copy{
  font-family:var(--bs-font-mono);
  font-size:11.5px;letter-spacing:.1em;
  color:rgba(244,235,221,.5);
  max-width:none;
}

/* ---------- 9. 基础组件 ---------- */
.bs-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 24px;
  border-radius:999px;
  font-size:14.5px;font-weight:600;letter-spacing:.015em;
  border:1px solid transparent;
  transition:transform .22s ease,background .22s ease,border-color .22s ease,color .22s ease,box-shadow .22s ease;
}
.bs-btn--primary{
  color:#120A05;
  background:linear-gradient(118deg,var(--bs-orange),var(--bs-red) 70%);
  box-shadow:0 16px 36px -20px rgba(255,106,43,.95);
}
.bs-btn--primary:hover{transform:translateY(-2px);}
.bs-btn--cyan{
  color:var(--bs-cyan);
  border-color:var(--bs-line-strong);
  background:rgba(77,240,224,.08);
}
.bs-btn--cyan:hover{background:rgba(77,240,224,.18);border-color:var(--bs-cyan);}
.bs-btn--ghost{
  color:var(--bs-text);
  border-color:var(--bs-line);
  background:rgba(42,53,80,.42);
}
.bs-btn--ghost:hover{border-color:var(--bs-line-strong);background:rgba(42,53,80,.7);}

.bs-badge{
  display:inline-flex;align-items:center;gap:7px;
  padding:4px 11px;
  border-radius:999px;
  font-family:var(--bs-font-mono);
  font-size:11.5px;font-weight:700;letter-spacing:.1em;
  border:1px solid var(--bs-line-strong);
  color:var(--bs-cyan);
  background:rgba(77,240,224,.08);
}
.bs-badge--orange{color:var(--bs-orange);border-color:rgba(255,106,43,.42);background:rgba(255,106,43,.1);}
.bs-badge--violet{color:#D7A9FF;border-color:rgba(192,77,255,.42);background:rgba(123,77,255,.14);}

.bs-card{
  position:relative;
  padding:clamp(20px,2.4vw,32px);
  border-radius:var(--bs-radius);
  border:1px solid var(--bs-line);
  background:rgba(42,53,80,.36);
  color:var(--bs-text);
}
.bs-card--cream{
  background:var(--bs-cream);
  color:var(--bs-ink);
  border-color:rgba(26,22,20,.14);
}
.bs-card--cream h3,.bs-card--cream h2{color:var(--bs-ink);}
.bs-card--cream p{color:var(--bs-ink-soft);}
.bs-card--violet{
  background:linear-gradient(158deg,rgba(123,77,255,.28),rgba(192,77,255,.12));
  border-color:rgba(192,77,255,.42);
}
.bs-card--line{border-left:3px solid var(--bs-cyan);}
.bs-card--glass{
  background:rgba(42,53,80,.5);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}

.bs-index{display:grid;}
.bs-index__item{border-top:1px solid var(--bs-line);}
.bs-index__item:last-child{border-bottom:1px solid var(--bs-line);}
.bs-index__link{
  display:grid;
  grid-template-columns:auto 1fr auto auto;
  align-items:center;
  gap:clamp(12px,2vw,26px);
  padding:18px 4px;
  transition:background .24s ease,padding .24s ease;
}
.bs-index__link:hover,
.bs-index__link:focus-visible{background:rgba(42,53,80,.55);padding-inline:16px 10px;}
.bs-index__no{
  font-family:var(--bs-font-mono);
  font-weight:700;font-size:13px;letter-spacing:.06em;
  color:var(--bs-orange);
}
.bs-index__text{font-size:clamp(16px,1.7vw,20px);color:var(--bs-text);}
.bs-index__meta{font-size:12.5px;letter-spacing:.06em;color:var(--bs-text-faint);}
.bs-index__arrow{font-family:var(--bs-font-mono);font-size:14px;color:var(--bs-cyan);}

.bs-compare{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:clamp(14px,2vw,26px);
}
.bs-compare__col{
  padding:clamp(18px,2.2vw,30px);
  border-radius:var(--bs-radius);
  border:1px solid var(--bs-line);
  background:rgba(42,53,80,.36);
}
.bs-compare__col--a{
  border-color:rgba(77,240,224,.42);
  box-shadow:inset 3px 0 0 var(--bs-cyan);
}
.bs-compare__col--b{
  border-color:rgba(192,77,255,.44);
  background:linear-gradient(160deg,rgba(123,77,255,.26),rgba(192,77,255,.08));
  box-shadow:inset 3px 0 0 var(--bs-orange);
}
.bs-compare__tag{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--bs-font-mono);
  font-size:12px;font-weight:700;letter-spacing:.12em;
  color:var(--bs-cyan);
}
.bs-compare__col--b .bs-compare__tag{color:#E3C2FF;}
.bs-compare__list{margin-top:14px;display:grid;gap:10px;font-size:15.5px;line-height:1.8;color:var(--bs-text-soft);}
.bs-compare__list li{position:relative;padding-left:17px;}
.bs-compare__list li::before{
  content:"";position:absolute;left:0;top:.72em;
  width:6px;height:6px;border-radius:2px;background:var(--bs-cyan);
}
.bs-compare__col--b .bs-compare__list li::before{background:var(--bs-orange);}

.bs-fold{border-top:1px solid var(--bs-line);}
.bs-fold:last-of-type{border-bottom:1px solid var(--bs-line);}
.bs-fold__trigger{
  width:100%;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:20px 2px;
  text-align:left;
  font-size:clamp(16.5px,1.8vw,21px);
  font-weight:400;
  color:var(--bs-text);
  transition:color .22s ease;
}
.bs-fold__trigger:hover{color:var(--bs-cyan);}
.bs-fold__icon{
  position:relative;flex:0 0 auto;
  width:26px;height:26px;border-radius:50%;
  border:1px solid var(--bs-line-strong);
  transition:border-color .24s ease,background .24s ease;
}
.bs-fold__icon::before,
.bs-fold__icon::after{
  content:"";position:absolute;left:50%;top:50%;
  width:11px;height:1.5px;border-radius:2px;background:var(--bs-cyan);
  transform:translate(-50%,-50%);
  transition:transform .3s ease,background .24s ease;
}
.bs-fold__icon::after{transform:translate(-50%,-50%) rotate(90deg);}
.bs-fold[data-open="true"] .bs-fold__icon{background:rgba(77,240,224,.14);border-color:var(--bs-cyan);}
.bs-fold[data-open="true"] .bs-fold__icon::after{transform:translate(-50%,-50%) rotate(0deg);}
.bs-fold__panel{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows .38s cubic-bezier(.22,.61,.36,1);
}
.bs-fold[data-open="true"] .bs-fold__panel{grid-template-rows:1fr;}
.bs-fold__inner{overflow:hidden;}
.bs-fold__body{
  padding:2px 0 26px;
  font-size:15.5px;line-height:1.9;
  color:var(--bs-text-soft);
  max-width:74ch;
}

.bs-media{
  position:relative;
  overflow:hidden;
  border-radius:var(--bs-radius);
  border:1px solid var(--bs-line);
  background:linear-gradient(152deg,#13203C 0%,#0A1020 56%,#160F2A 100%);
  isolation:isolate;
}
.bs-media::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.55;
  background:
    linear-gradient(rgba(184,255,248,.08) 1px,transparent 1px) 0 0/100% 33.33%,
    linear-gradient(90deg,transparent calc(50% - .5px),rgba(77,240,224,.35) calc(50% - .5px),rgba(77,240,224,.35) calc(50% + .5px),transparent calc(50% + .5px));
}
.bs-media__img{width:100%;height:100%;object-fit:cover;}
.bs-media__slot{
  position:absolute;inset:0;
  display:grid;place-items:center;
  font-family:var(--bs-font-mono);
  font-size:11.5px;letter-spacing:.18em;
  color:rgba(184,255,248,.5);
  text-align:center;padding:16px;
}
.bs-media__cap{
  position:absolute;left:0;right:0;bottom:0;
  padding:14px 18px;
  font-size:12.5px;letter-spacing:.06em;
  color:var(--bs-mist);
  background:linear-gradient(180deg,transparent,rgba(10,16,32,.9));
}
.bs-media--16x9{aspect-ratio:16/9;}
.bs-media--4x3{aspect-ratio:4/3;}
.bs-media--1x1{aspect-ratio:1/1;}
.bs-media--3x4{aspect-ratio:3/4;}
.bs-media--21x9{aspect-ratio:21/9;}

/* ---------- 10. 工具与动效 ---------- */
.bs-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;
}
.bs-js [data-reveal]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .62s ease,transform .62s cubic-bezier(.22,.61,.36,1);
  will-change:opacity,transform;
}
.bs-js [data-reveal].is-revealed{opacity:1;transform:none;}

@media (prefers-reduced-motion: no-preference){
  html{scroll-behavior:smooth;}
}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .bs-js [data-reveal]{opacity:1 !important;transform:none !important;}
  .bs-progress__bar{transition:none !important;}
}

/* ---------- 11. 响应式 ---------- */
@media (max-width:1080px){
  .bs-footer__inner{grid-template-columns:1.4fr 1fr 1fr;row-gap:clamp(28px,4vw,44px);}
  .bs-footer__col--contact{grid-column:1 / -1;}
  .bs-footer__contact{grid-template-columns:repeat(2,minmax(0,1fr));}
  .bs-grid--4{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:960px){
  :root{--bs-header-h:64px;}
  .bs-header{background:rgba(10,16,32,.88);border-bottom-color:var(--bs-line);}
  .bs-header[data-solid="true"]{background:rgba(10,16,32,.97);}
  .bs-nav-toggle{display:inline-flex;}
  .bs-header__actions{display:none;}
  .bs-brand__sub{display:none;}
  .bs-nav{
    position:fixed;
    left:0;right:0;
    top:var(--bs-header-h);
    display:block;
    max-height:calc(100vh - var(--bs-header-h));
    overflow-y:auto;
    margin:0;
    padding:20px var(--bs-gutter) 32px;
    background:rgba(8,13,26,.98);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    border-bottom:1px solid var(--bs-line);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .28s ease,transform .28s ease,visibility .28s ease;
  }
  .bs-nav[data-open="true"]{opacity:1;visibility:visible;transform:none;}
  .bs-nav__group{display:grid;gap:0;}
  .bs-nav__group li{border-bottom:1px solid var(--bs-line);}
  .bs-nav__link{display:flex;align-items:center;padding:15px 2px;font-size:16.5px;}
  .bs-nav__link::after{bottom:8px;right:auto;width:34px;}
  .bs-nav__link:hover::after{transform:scaleX(1);}
  .bs-nav__foot{
    display:grid;gap:14px;
    margin-top:22px;
    padding-top:20px;
    border-top:1px dashed rgba(184,255,248,.2);
  }
  .bs-nav__hint{
    font-family:var(--bs-font-mono);
    font-size:11.5px;letter-spacing:.14em;
    color:rgba(184,255,248,.6);
  }
  .bs-nav__foot .bs-cta{justify-self:start;}
  .bs-grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:720px){
  body{font-size:15.5px;line-height:1.88;}
  .bs-grid--2,
  .bs-grid--3,
  .bs-grid--4{grid-template-columns:minmax(0,1fr);}
  .bs-compare{grid-template-columns:minmax(0,1fr);}
  .bs-index__link{grid-template-columns:auto 1fr;row-gap:6px;}
  .bs-index__meta{grid-column:2;}
  .bs-index__arrow{grid-column:2;justify-self:start;}
  .bs-footer__inner{grid-template-columns:minmax(0,1fr);}
  .bs-footer__contact{grid-template-columns:minmax(0,1fr);}
  .bs-footer__halfcourt{max-width:180px;height:54px;}
  .bs-footer__base{flex-direction:column;align-items:flex-start;gap:8px;padding-bottom:26px;}
}

@media (max-width:520px){
  .bs-cta{padding:10px 16px;font-size:13px;}
  .bs-brand__glyph{width:32px;height:32px;border-radius:10px;}
  .bs-brand__mark{font-size:15.5px;}
  .bs-media--21x9{aspect-ratio:16/9;}
}