/* =========================================================
   BBIN品牌站 · 共享样式 /assets/site.css
   reset · 变量 · 中文排版 · 侧边轨道头部 · 页脚 · 通用组件
   ========================================================= */

*,*::before,*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:24px;
}

body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,hr{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}

:root{
  /* 色彩体系 */
  --deep:#0B1B2B;
  --deep-2:#13293D;
  --deep-3:#0E2134;
  --lake:#1F8FA6;
  --lake-soft:#7FD4E0;
  --lime:#3DF08A;
  --lime-ink:#062413;
  --batch:#FF8A3D;
  --copper:#C9A66B;
  --frost:#F4F8FB;
  --ink:#1C2530;
  --muted:#6B7A88;
  --hair:#DCE6ED;

  /* 布局尺寸 */
  --rail-w:248px;
  --content-max:1240px;
  --gut:clamp(18px,4vw,56px);

  /* 运动 */
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:260ms;

  /* 字体 */
  --font-display:Georgia,"Songti SC","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  /* 材质 */
  --shadow-1:0 1px 2px rgba(11,27,43,.06),0 6px 18px rgba(11,27,43,.05);
  --shadow-2:0 20px 52px rgba(3,10,18,.42);
}

/* ---------- 基础排版 ---------- */

body{
  font-family:var(--font-sans);
  font-size:16.5px;
  line-height:1.78;
  color:var(--ink);
  background:var(--frost);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

h1,h2,h3,h4{line-height:1.3;font-weight:600;}

.display{
  font-family:var(--font-display);
  font-size:clamp(30px,4.2vw,58px);
  font-weight:600;
  letter-spacing:-.01em;
  line-height:1.12;
  color:var(--deep);
}

.title{font-size:clamp(20px,2.2vw,28px);letter-spacing:-.005em;color:var(--deep);}
.title-sm{font-size:17px;font-weight:600;color:var(--deep);}

.lede{
  font-size:clamp(16.5px,1.6vw,19px);
  line-height:1.7;
  color:#33404C;
  max-width:62ch;
}

.prose{max-width:68ch;font-size:16.5px;line-height:1.78;color:var(--ink);}
.prose p + p{margin-top:1.05em;}
.prose h2{margin:2.1em 0 .7em;font-size:21px;color:var(--deep);}
.prose h3{margin:1.7em 0 .5em;font-size:17.5px;color:var(--deep);}
.prose ul{margin:1em 0;padding-left:1.15em;list-style:disc;}
.prose li{margin:.4em 0;}
.prose a{border-bottom:1px solid var(--lake);color:#12657A;}
.prose strong{font-weight:600;color:var(--deep);}

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:1.06em;
  font-weight:500;
  letter-spacing:.02em;
}

.eyebrow{
  display:inline-flex;align-items:center;gap:.6em;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--muted);
}
.eyebrow--onDark{color:rgba(127,212,224,.72);}

/* ---------- 布局容器 ---------- */

.wrap{
  width:100%;
  max-width:var(--content-max);
  margin-inline:auto;
  padding-inline:var(--gut);
}

.section{padding-block:clamp(42px,6vw,86px);}
.section--tight{padding-block:clamp(26px,3.4vw,48px);}
.section__head{display:flex;flex-direction:column;gap:14px;margin-bottom:clamp(22px,3vw,40px);}
.section__num{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--lake);
}

.rule{height:1px;background:var(--hair);border:0;width:100%;}

.grid{display:grid;gap:24px;}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.col-4{grid-column:span 4;}
.col-5{grid-column:span 5;}
.col-7{grid-column:span 7;}
.col-8{grid-column:span 8;}
.col-12{grid-column:span 12;}

/* ---------- 按钮 ---------- */

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:.68em 1.2em;
  border:1px solid var(--hair);
  border-radius:3px;
  background:#fff;
  color:var(--ink);
  font-size:14.5px;
  line-height:1.3;
  letter-spacing:.01em;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease),color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{border-color:var(--lake);color:#12657A;transform:translateY(-1px);}
.btn--solid{background:var(--lime);border-color:var(--lime);color:var(--lime-ink);font-weight:600;}
.btn--solid:hover{background:#31DC7C;border-color:#31DC7C;color:#041B0E;}
.btn--dark{background:var(--deep-2);border-color:rgba(127,212,224,.26);color:var(--lake-soft);}
.btn--dark:hover{background:#173149;border-color:var(--lime);color:var(--lime);}
.btn--ghost{background:transparent;border-color:rgba(127,212,224,.3);color:var(--lake-soft);}
.btn--ghost:hover{border-color:var(--lime);color:var(--lime);background:rgba(61,240,138,.06);}
.btn--sm{padding:.45em .85em;font-size:13px;}

/* ---------- 标签 ---------- */

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  border:1px solid var(--hair);
  border-radius:999px;
  background:rgba(255,255,255,.7);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  text-transform:uppercase;
  line-height:1.6;
  white-space:nowrap;
}
.tag--live{border-color:rgba(61,240,138,.5);background:rgba(61,240,138,.12);color:#0E6E3E;}
.tag--batch{border-color:rgba(255,138,61,.5);background:rgba(255,138,61,.1);color:#A24A12;}
.tag--gold{border-color:rgba(201,166,107,.6);background:rgba(201,166,107,.12);color:#7A5C24;}
.tag--lake{border-color:rgba(31,143,166,.4);background:rgba(31,143,166,.1);color:#146A7C;}

/* ---------- 面包屑 ---------- */

.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:.55em;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
}
.crumbs li{display:flex;align-items:center;gap:.55em;}
.crumbs li + li::before{content:"/";color:rgba(107,122,136,.45);}
.crumbs a{transition:color var(--dur) var(--ease);}
.crumbs a:hover{color:#12657A;}
.crumbs [aria-current="page"]{color:var(--ink);}

/* ---------- 图像容器（页面阶段使用） ---------- */

.figure{display:flex;flex-direction:column;gap:10px;margin:0;}

.frame{
  position:relative;
  display:block;
  width:100%;
  min-height:120px;
  overflow:hidden;
  border:1px solid var(--hair);
  border-radius:4px;
  aspect-ratio:var(--frame-ratio,auto);
  background:
    radial-gradient(120% 90% at 6% 0%,rgba(31,143,166,.18),transparent 58%),
    linear-gradient(160deg,#E9F2F8 0%,var(--frost) 58%,#E5EFF5 100%);
}
.frame::after{
  content:"";
  position:absolute;inset:0;z-index:2;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(11,27,43,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(11,27,43,.05) 1px,transparent 1px);
  background-size:44px 44px;
  opacity:.7;
}
.frame > img,
.frame > svg{
  position:relative;z-index:1;
  width:100%;height:100%;
  object-fit:cover;
}
.frame--16x9{--frame-ratio:16/9;}
.frame--4x3{--frame-ratio:4/3;}
.frame--3x2{--frame-ratio:3/2;}
.frame--1x1{--frame-ratio:1/1;}
.frame--21x9{--frame-ratio:21/9;}

.figure__cap{
  display:flex;align-items:center;gap:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--muted);
}
.figure__cap::before{content:"";width:22px;height:1px;background:var(--lake);flex:none;}

/* ---------- 焦点 ---------- */

:focus-visible{
  outline:2px solid var(--lake);
  outline-offset:3px;
  border-radius:2px;
}
.rail :focus-visible,
.foot :focus-visible{outline-color:var(--lime);}

/* ---------- 跳转链接 ---------- */

.skip-link{
  position:fixed;
  top:12px;left:12px;
  z-index:200;
  padding:.72em 1.15em;
  border-radius:3px;
  background:var(--lime);
  color:var(--lime-ink);
  font-size:14px;
  font-weight:600;
  letter-spacing:.02em;
  box-shadow:var(--shadow-2);
  transform:translateY(-190%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus{transform:translateY(0);}

/* ---------- 顶部滚动刻度 ---------- */

.scroll-meter{
  position:fixed;
  top:0;left:0;right:0;
  height:2px;
  z-index:90;
  background:rgba(127,212,224,.1);
  pointer-events:none;
}
.scroll-meter__fill{
  display:block;
  width:100%;height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--lake),var(--lime));
  opacity:0;
  transition:opacity 240ms var(--ease);
}
.scroll-meter[data-visible="true"] .scroll-meter__fill{opacity:1;}

/* =========================================================
   侧边轨道导航
   ========================================================= */

.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail-w);
  z-index:60;
  display:flex;
  flex-direction:column;
  overflow-y:auto;
  overscroll-behavior:contain;
  color:#B9D2DD;
  border-right:1px solid rgba(127,212,224,.16);
  background:
    radial-gradient(120% 62% at 0% 0%,rgba(31,143,166,.24),transparent 62%),
    linear-gradient(180deg,#0B1B2B 0%,var(--deep-3) 56%,#091624 100%);
}
.rail::after{
  content:"";
  position:absolute;inset:0;
  pointer-events:none;
  background-image:linear-gradient(rgba(127,212,224,.055) 1px,transparent 1px);
  background-size:100% 32px;
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 16%,#000 84%,transparent);
  mask-image:linear-gradient(180deg,transparent,#000 16%,#000 84%,transparent);
}

.rail__inner{
  position:relative;z-index:1;
  display:flex;
  flex-direction:column;
  gap:26px;
  min-height:100%;
  padding:26px 20px 30px;
}

.rail__head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:12px;
}

/* 品牌 */
.brand{display:flex;align-items:center;gap:11px;}
.brand__mark{
  flex:none;
  width:34px;height:34px;
  display:grid;place-items:center;
  border:1px solid rgba(61,240,138,.38);
  border-radius:3px;
  color:var(--lime);
  background:linear-gradient(140deg,rgba(61,240,138,.16),rgba(31,143,166,.14));
}
.brand__mark svg{width:19px;height:19px;}
.brand__wordmark{display:flex;flex-direction:column;gap:2px;line-height:1.28;}
.brand__name{font-size:15.5px;font-weight:600;letter-spacing:.02em;color:#EAF6FA;}
.brand__tagline{font-size:11px;letter-spacing:.06em;color:var(--lake-soft);opacity:.72;}

/* 移动端开关 */
.rail__toggle{
  display:none;
  align-items:center;gap:9px;
  padding:7px 11px;
  border:1px solid rgba(127,212,224,.28);
  border-radius:3px;
  color:var(--lake-soft);
  font-size:12px;
  letter-spacing:.12em;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.rail__toggle:hover{border-color:var(--lime);color:var(--lime);}
.rail__toggle-bars{display:flex;flex-direction:column;gap:4px;width:16px;}
.rail__toggle-bars i{display:block;height:1px;background:currentColor;}
.rail__toggle-bars i:first-child{width:16px;}
.rail__toggle-bars i:last-child{width:10px;align-self:flex-end;}

/* 分组小标题 */
.rail__legend{
  display:flex;align-items:center;gap:9px;
  margin-bottom:11px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:rgba(127,212,224,.55);
}
.rail__legend::after{
  content:"";
  flex:1;height:1px;
  background:rgba(127,212,224,.16);
}
.rail__group{display:flex;flex-direction:column;}
.rail__rule{height:1px;background:rgba(127,212,224,.14);}

/* 导航列表 */
.nav-list{counter-reset:nl;display:flex;flex-direction:column;gap:1px;}
.nav-list__link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:9px 10px 9px 13px;
  border-radius:2px;
  font-size:14.5px;
  color:#B9D2DD;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-list__link::before{
  counter-increment:nl;
  content:counter(nl,decimal-leading-zero);
  flex:none;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.06em;
  color:rgba(127,212,224,.4);
  transition:color var(--dur) var(--ease);
}
.nav-list__link::after{
  content:"";
  position:absolute;
  left:0;top:50%;
  width:2px;height:18px;
  background:var(--lime);
  transform:translateY(-50%) scaleY(0);
  transform-origin:50% 50%;
  transition:transform var(--dur) var(--ease);
}
.nav-list__link:hover{color:#FFFFFF;background:rgba(127,212,224,.06);}
.nav-list__link:hover::before{color:var(--lake-soft);}
.nav-list__link[aria-current="page"]{
  color:#FFFFFF;
  background:rgba(61,240,138,.08);
}
.nav-list__link[aria-current="page"]::before{color:var(--lime);}
.nav-list__link[aria-current="page"]::after{transform:translateY(-50%) scaleY(1);}

/* 快捷动作卡片 */
.action-list{display:flex;flex-direction:column;gap:9px;}
.action{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:2px 10px;
  padding:11px 12px;
  border:1px solid rgba(127,212,224,.16);
  border-radius:3px;
  background:linear-gradient(150deg,rgba(19,41,61,.86),rgba(11,27,43,.52));
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.action:hover{
  border-color:rgba(61,240,138,.5);
  background:linear-gradient(150deg,rgba(23,52,76,.95),rgba(11,27,43,.6));
  transform:translateX(3px);
}
.action__dot{
  grid-row:span 2;
  width:6px;height:6px;
  margin-top:8px;
  border-radius:50%;
}
.action__dot--live{background:var(--lime);box-shadow:0 0 0 3px rgba(61,240,138,.18);}
.action__dot--batch{background:var(--batch);box-shadow:0 0 0 3px rgba(255,138,61,.16);}
.action__dot--gold{background:var(--copper);box-shadow:0 0 0 3px rgba(201,166,107,.16);}
.action__label{font-size:14px;font-weight:600;color:#EAF6FA;line-height:1.5;}
.action__note{font-size:11.5px;line-height:1.55;color:rgba(185,210,221,.72);}

/* =========================================================
   页脚
   ========================================================= */

.foot{
  position:relative;
  margin-top:clamp(52px,7vw,104px);
  color:#B9D2DD;
  border-top:1px solid rgba(127,212,224,.18);
  background:
    radial-gradient(95% 120% at 100% 0%,rgba(31,143,166,.22),transparent 60%),
    linear-gradient(180deg,#0B1B2B 0%,var(--deep-3) 58%,#091522 100%);
}
.foot::before{
  content:"";
  position:absolute;inset:0;
  pointer-events:none;
  background-image:linear-gradient(90deg,rgba(127,212,224,.045) 1px,transparent 1px);
  background-size:64px 100%;
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 78%);
  mask-image:linear-gradient(180deg,#000,transparent 78%);
}

.foot__inner{
  position:relative;z-index:1;
  width:100%;
  max-width:var(--content-max);
  margin-inline:auto;
  padding:clamp(36px,5vw,64px) var(--gut) clamp(24px,3vw,34px);
}

.foot__lead{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding-bottom:26px;
  border-bottom:1px solid rgba(127,212,224,.14);
}
.foot__brand{display:flex;align-items:center;gap:12px;}
.foot__mark{
  flex:none;
  width:32px;height:32px;
  display:grid;place-items:center;
  border:1px solid rgba(61,240,138,.4);
  border-radius:3px;
  color:var(--lime);
  background:linear-gradient(140deg,rgba(61,240,138,.15),rgba(31,143,166,.14));
}
.foot__mark svg{width:18px;height:18px;}
.foot__ident{display:flex;flex-direction:column;gap:2px;line-height:1.3;}
.foot__name{font-size:15px;font-weight:600;letter-spacing:.02em;color:#EAF6FA;}
.foot__tagline{font-size:11.5px;letter-spacing:.06em;color:rgba(127,212,224,.7);}

.foot__status{
  display:inline-flex;align-items:center;gap:9px;
  padding:7px 15px;
  border:1px solid rgba(127,212,224,.18);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.04em;
  color:rgba(127,212,224,.78);
}
.foot__pulse{
  flex:none;
  width:6px;height:6px;
  border-radius:50%;
  background:var(--lime);
  animation:breathe 1.6s var(--ease) infinite;
}
@keyframes breathe{
  0%,100%{opacity:1;}
  50%{opacity:.42;}
}

.foot__cols{
  display:grid;
  grid-template-columns:1fr 1fr .85fr 1.7fr;
  gap:30px 24px;
  padding:34px 0;
  border-bottom:1px solid rgba(127,212,224,.14);
}
.foot__col{display:flex;flex-direction:column;min-width:0;}
.foot__title{
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:rgba(127,212,224,.6);
}
.foot__links{display:flex;flex-direction:column;gap:10px;}
.foot__links a{
  display:inline-block;
  font-size:14px;
  color:#B9D2DD;
  transition:color var(--dur) var(--ease),padding-left var(--dur) var(--ease);
}
.foot__links a:hover{color:var(--lime);padding-left:5px;}
.foot__links a[aria-current="page"]{color:var(--lime);}

/* 联系方式 */
.contact-list{display:flex;flex-direction:column;gap:13px;}
.contact-item{
  display:grid;
  grid-template-columns:1fr auto;
  gap:3px 12px;
  align-items:center;
  padding-bottom:12px;
  border-bottom:1px dashed rgba(127,212,224,.16);
}
.contact-item:last-child{border-bottom:0;padding-bottom:0;}
.contact-item__key{
  grid-column:1 / -1;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:rgba(127,212,224,.55);
}
.contact-item__val{
  min-width:0;
  font-family:var(--font-mono);
  font-size:14.5px;
  letter-spacing:.01em;
  color:#EAF6FA;
  word-break:break-all;
}
.copy-btn{
  display:inline-flex;align-items:center;
  padding:5px 11px;
  border:1px solid rgba(127,212,224,.24);
  border-radius:999px;
  font-size:11.5px;
  letter-spacing:.08em;
  color:rgba(127,212,224,.85);
  white-space:nowrap;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.copy-btn:hover{border-color:var(--lime);color:var(--lime);}
.copy-btn[data-copied="true"]{
  border-color:rgba(61,240,138,.5);
  background:rgba(61,240,138,.14);
  color:var(--lime);
}

.foot__note{
  max-width:60ch;
  margin-top:16px;
  font-size:12.5px;
  line-height:1.72;
  color:rgba(148,178,192,.62);
}

.foot__meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  padding-top:22px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:rgba(148,178,192,.72);
}
.foot__icp{white-space:nowrap;}

/* =========================================================
   滚动显现（脚本注入 body.reveal-ready 后生效）
   ========================================================= */

body.reveal-ready [data-reveal]{
  opacity:0;
  transform:translateY(12px);
}
body.reveal-ready [data-reveal].is-visible{
  opacity:1;
  transform:none;
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}

/* =========================================================
   响应式
   ========================================================= */

@media (min-width:1024px){
  body{padding-left:var(--rail-w);}
}

@media (max-width:1023px){
  body{padding-left:0;}
  body.rail-open::after{
    content:"";
    position:fixed;inset:0;z-index:55;
    background:rgba(5,14,23,.62);
  }
  .rail{
    left:auto;right:0;
    width:min(340px,86vw);
    border-right:0;
    border-left:1px solid rgba(127,212,224,.16);
    box-shadow:-20px 0 60px rgba(3,10,18,.6);
    transform:translateX(101%);
    transition:transform .32s var(--ease);
  }
  .rail[data-open="true"]{transform:translateX(0);}
  .rail__toggle{display:inline-flex;}
  .skip-link{left:auto;right:12px;}
  .foot__cols{grid-template-columns:1fr 1fr;}
  .foot__contact{grid-column:1 / -1;}
}

@media (max-width:960px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr));}
  .col-4,.col-5,.col-7,.col-8,.col-12{grid-column:span 6;}
}

@media (max-width:640px){
  body{font-size:16px;}
  .wrap{padding-inline:20px;}
  .foot__cols{grid-template-columns:1fr;gap:26px;}
  .foot__contact{grid-column:auto;}
  .foot__lead{flex-direction:column;align-items:flex-start;}
  .foot__status{font-size:11px;padding:6px 12px;line-height:1.6;}
  .foot__meta{flex-direction:column;align-items:flex-start;}
  .contact-item__val{font-size:13.5px;}
}

/* =========================================================
   减少动效
   ========================================================= */

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  body.reveal-ready [data-reveal]{opacity:1;transform:none;}
  .rail{transition:none;}
  .scroll-meter__fill{transition:none;}
}