/* =========================================================
   奔驰宝马游艺 · 共享外壳样式  /assets/site.css
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:84px;
}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,figcaption,blockquote,dl,dt,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{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:#05070B;
  --carbon:#10141B;
  --steel:#1B2129;
  --brushed:#2E3742;
  --frost:#E6ECF2;
  --mist:#9AA6B4;
  --blue:#7FB6D9;
  --cyan:#4FD1C5;
  --neon:#C21F5A;
  --amber:#FFC24B;

  --rail-w:88px;
  --shell-max:1180px;
  --gap:24px;
  --r:4px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --t-fast:160ms;
  --t-mid:240ms;
  --t-slow:320ms;

  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}

/* ---------- 3. Base ---------- */
body{
  min-height:100vh;
  padding-left:var(--rail-w);
  overflow-x:hidden;
  background:
    radial-gradient(1100px 620px at 84% -10%, rgba(127,182,217,.11), transparent 62%),
    radial-gradient(900px 540px at 4% 102%, rgba(79,209,197,.075), transparent 60%),
    var(--ink);
  color:var(--frost);
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.85;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-weight:800;
  font-stretch:92%;
  line-height:1.24;
  letter-spacing:-.012em;
  color:var(--frost);
}
p{max-width:78ch}
strong,b{font-weight:700;color:var(--frost)}

:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}

/* ---------- 4. Utilities ---------- */
.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;
}
.skip{
  position:fixed;left:10px;top:-70px;z-index:200;
  padding:10px 18px;border-radius:var(--r);
  background:var(--cyan);color:#04161A;
  font-size:13px;font-weight:800;
  transition:top var(--t-fast) var(--ease);
}
.skip:focus{top:10px}

.shell{
  width:100%;
  max-width:var(--shell-max);
  margin:0 auto;
  padding:0 clamp(20px,4vw,56px);
}

.section{padding:clamp(48px,7vw,96px) 0}
.section--tight{padding:clamp(30px,4vw,56px) 0}
.section__head{display:flex;flex-direction:column;gap:12px;margin-bottom:clamp(24px,3.2vw,42px)}
.eyebrow{
  font-family:var(--mono);font-size:12px;letter-spacing:.18em;
  color:var(--blue);text-transform:uppercase;
}
.lead{color:var(--mist);font-size:15.5px;max-width:64ch}

.lightbar{
  position:relative;height:3px;width:100%;border-radius:2px;overflow:hidden;
  background:linear-gradient(90deg,var(--blue) 0%,var(--cyan) 52%,rgba(79,209,197,0) 100%);
}
.lightbar::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,transparent 0%,rgba(230,236,242,.92) 48%,transparent 92%);
  transform:translateX(-100%);
  animation:lightflow 8s linear infinite;
}
@keyframes lightflow{
  0%{transform:translateX(-100%)}
  52%{transform:translateX(100%)}
  100%{transform:translateX(100%)}
}

.num{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}

/* ---------- 5. Grid ---------- */
.grid{display:grid;gap:var(--gap)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}

/* ---------- 6. Rail / Header ---------- */
.rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:80;
  display:flex;flex-direction:column;
  background:linear-gradient(180deg,#0A1018 0%,#05070B 46%,#070B12 100%);
  border-right:1px solid var(--steel);
}
.rail::after{
  content:"";position:absolute;top:0;right:0;width:2px;height:100%;
  pointer-events:none;
  background:linear-gradient(180deg,var(--cyan) 0%,rgba(127,182,217,.45) 44%,rgba(127,182,217,0) 94%);
  animation:railGlow 8s var(--ease) infinite;
}
@keyframes railGlow{
  0%,100%{opacity:.4}
  50%{opacity:.88}
}

.rail__brand{
  flex:0 0 auto;
  padding:20px 6px 16px;
  text-align:center;
  border-bottom:1px solid var(--steel);
}
.rail__brand-link{display:block}
.rail__brand-name{
  display:block;
  font-size:11px;font-weight:800;font-stretch:92%;
  line-height:1.45;letter-spacing:.04em;color:var(--frost);
}
.rail__brand-sub{
  display:block;margin-top:9px;
  font-family:var(--mono);font-size:9px;line-height:1.55;
  letter-spacing:.05em;color:var(--mist);opacity:.82;
}

.rail__toggle{
  display:none;
  width:44px;height:44px;flex:0 0 auto;
  flex-direction:column;align-items:center;justify-content:center;gap:5px;
  border:1px solid var(--brushed);border-radius:var(--r);
  cursor:pointer;
  transition:border-color var(--t-fast) var(--ease);
}
.rail__toggle:hover{border-color:var(--blue)}
.rail__toggle-bar{
  display:block;width:18px;height:1px;background:var(--frost);
  transition:transform var(--t-mid) var(--ease),opacity var(--t-fast) var(--ease);
}
.rail__toggle[aria-expanded="true"] .rail__toggle-bar:nth-child(1){transform:translateY(3px) rotate(45deg)}
.rail__toggle[aria-expanded="true"] .rail__toggle-bar:nth-child(2){transform:translateY(-3px) rotate(-45deg)}

.rail__nav{
  flex:1 1 auto;
  display:flex;flex-direction:column;justify-content:center;
  padding:12px 0;
  overflow-y:auto;overflow-x:hidden;
}
.rail__list{display:flex;flex-direction:column;gap:2px;width:100%}
.rail__list a{
  position:relative;display:block;
  padding:10px 4px;text-align:center;
  font-size:12px;line-height:1.25;letter-spacing:.06em;
  color:var(--mist);
  border-left:2px solid transparent;
  transition:color var(--t-fast) var(--ease),background var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.rail__list a:hover,
.rail__list a:focus-visible{
  color:var(--frost);
  background:linear-gradient(90deg,rgba(127,182,217,.16),rgba(127,182,217,0));
  border-left-color:var(--blue);
}
.rail__list a[aria-current="page"]{
  color:var(--frost);font-weight:700;
  background:linear-gradient(90deg,rgba(79,209,197,.22),rgba(127,182,217,.04));
  border-left-color:var(--cyan);
}

.rail__tools{
  flex:0 0 auto;
  padding:12px 8px 18px;
  border-top:1px solid var(--steel);
  display:flex;flex-direction:column;gap:8px;
}
.rail__tool{
  display:block;width:100%;
  padding:9px 2px;
  border:1px solid var(--brushed);border-radius:var(--r);
  background:transparent;color:var(--mist);
  font-size:11px;line-height:1.25;letter-spacing:.04em;
  cursor:pointer;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease),background var(--t-fast) var(--ease),opacity var(--t-mid) var(--ease),transform var(--t-mid) var(--ease);
}
.rail__tool:hover,
.rail__tool:focus-visible{
  color:var(--frost);
  border-color:var(--blue);
  background:rgba(127,182,217,.10);
}
.rail__tool[data-to-top]{
  opacity:0;pointer-events:none;transform:translateY(6px);
}
.rail__tool[data-to-top][data-visible]{
  opacity:1;pointer-events:auto;transform:translateY(0);
  color:var(--frost);border-color:rgba(79,209,197,.55);
}

.rail__scrim{
  position:fixed;inset:0;z-index:70;
  background:rgba(3,5,8,.72);
  opacity:0;visibility:hidden;
  transition:opacity var(--t-mid) var(--ease),visibility var(--t-mid) var(--ease);
}
.rail__scrim[data-open]{opacity:1;visibility:visible}

/* ---------- 7. Buttons ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--frost);
  --btn-bd:var(--brushed);
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:var(--r);
  background:var(--btn-bg);color:var(--btn-fg);
  border:1px solid var(--btn-bd);
  font-size:14px;font-weight:600;line-height:1.2;letter-spacing:.02em;
  cursor:pointer;
  transition:transform var(--t-fast) var(--ease),background var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--solid{
  --btn-bg:linear-gradient(115deg,var(--blue),var(--cyan));
  --btn-fg:#04161A;--btn-bd:transparent;font-weight:800;
}
.btn--line{--btn-bd:rgba(127,182,217,.6);--btn-fg:var(--blue)}
.btn--line:hover{--btn-bg:rgba(127,182,217,.12);--btn-fg:var(--frost)}
.btn--neon{
  --btn-bd:rgba(194,31,90,.6);
  --btn-fg:#FFDCE8;
  --btn-bg:rgba(194,31,90,.16);
}
.btn--neon:hover{--btn-bg:rgba(194,31,90,.3);--btn-fg:#fff}
.btn--sm{padding:8px 14px;font-size:13px}

.copy-btn{
  display:inline-flex;align-items:center;
  margin-left:8px;padding:3px 8px;
  border:1px solid var(--brushed);border-radius:3px;
  background:transparent;color:var(--mist);
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  cursor:pointer;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.copy-btn:hover{color:var(--cyan);border-color:var(--cyan)}

/* ---------- 8. Small parts ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  padding:22px 0 0;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;
  color:var(--mist);
}
.crumbs li{display:flex;align-items:center;gap:10px}
.crumbs li+li::before{content:"›";color:var(--brushed)}
.crumbs a{color:var(--mist);transition:color var(--t-fast) var(--ease)}
.crumbs a:hover{color:var(--blue)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid var(--brushed);border-radius:3px;
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  color:var(--mist);white-space:nowrap;
}
.tag--amber{border-color:rgba(255,194,75,.5);color:var(--amber)}
.tag--neon{border-color:rgba(194,31,90,.55);color:#FFD0E0;background:rgba(194,31,90,.14)}

.card{
  position:relative;
  padding:22px 22px 24px;
  border:1px solid var(--steel);border-radius:var(--r);
  background:linear-gradient(180deg,rgba(16,20,27,.92),rgba(5,7,11,.55));
  transition:border-color var(--t-mid) var(--ease),transform var(--t-mid) var(--ease);
}
.card:hover{border-color:var(--brushed);transform:translateY(-2px)}

/* ---------- 9. Figure ---------- */
.figure{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--steel);border-radius:var(--r);
  background:linear-gradient(150deg,#10141B 0%,#05070B 100%);
}
.figure img{
  width:100%;height:100%;object-fit:cover;
  filter:saturate(.88) contrast(1.06) brightness(.92);
}
.figure::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(5,7,11,0) 44%,rgba(5,7,11,.72) 100%);
}
.figure--16x9{aspect-ratio:16/9}
.figure--4x3{aspect-ratio:4/3}
.figure--1x1{aspect-ratio:1/1}
.figure--tall{aspect-ratio:5/7}
.figure__cap{
  position:absolute;left:12px;bottom:10px;z-index:2;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  color:var(--mist);
}
.figure__badge{
  position:absolute;top:10px;left:10px;z-index:2;
  padding:3px 8px;border-radius:3px;
  background:rgba(5,7,11,.8);border:1px solid rgba(79,209,197,.45);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:var(--cyan);
}

/* ---------- 10. Footer ---------- */
.site-foot{
  position:relative;
  margin-top:clamp(56px,8vw,112px);
  padding:clamp(44px,6vw,76px) 0 30px;
  border-top:1px solid var(--steel);
  background:linear-gradient(180deg,#0A1018 0%,#05070B 34%,#04060A 100%);
}
.site-foot::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:2px;
  background:linear-gradient(90deg,rgba(127,182,217,.9),rgba(79,209,197,.9) 46%,rgba(194,31,90,.7) 86%,rgba(194,31,90,0));
}

.foot__top{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:18px;
}
.foot__brand-name{
  font-size:20px;font-weight:800;font-stretch:92%;letter-spacing:-.01em;color:var(--frost);
}
.foot__brand-sub{
  margin-top:6px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;color:var(--mist);
}

.foot__grid{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.35fr) minmax(0,1.1fr);
  gap:clamp(28px,4vw,56px);
  margin-top:clamp(32px,4.4vw,54px);
}
.foot__col{min-width:0}
.foot__title{
  display:flex;align-items:center;gap:10px;
  margin-bottom:16px;
  font-size:13px;font-weight:700;letter-spacing:.1em;color:var(--frost);
}
.foot__title::before{
  content:"";flex:0 0 auto;width:16px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--blue),var(--cyan));
}
.foot__list{display:flex;flex-direction:column;gap:9px}
.foot__list a{
  font-size:14px;color:var(--mist);
  transition:color var(--t-fast) var(--ease);
}
.foot__list a:hover{color:var(--blue)}
.foot__meta{
  margin-top:14px;
  font-size:12.5px;line-height:1.75;color:var(--mist);opacity:.82;
  max-width:46ch;
}

.foot__contact{display:flex;flex-direction:column;gap:14px}
.foot__contact > div{min-width:0}
.foot__contact dt{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  color:var(--brushed);text-transform:uppercase;
}
.foot__contact dd{
  margin-top:4px;
  font-size:14px;line-height:1.7;color:var(--frost);word-break:break-word;
}

/* ---- terms ---- */
.term-list{display:flex;flex-direction:column;gap:8px}
.terms__item{
  border:1px solid var(--steel);border-radius:var(--r);
  background:rgba(16,20,27,.62);
  overflow:hidden;
  transition:border-color var(--t-mid) var(--ease),background var(--t-mid) var(--ease);
}
.terms__item[data-open]{
  border-color:rgba(194,31,90,.5);
  background:rgba(24,14,22,.7);
}
.terms__head{
  display:flex;align-items:center;gap:10px;width:100%;
  padding:12px 14px;
  text-align:left;cursor:pointer;
  font-size:13.5px;font-weight:600;color:var(--frost);
  transition:color var(--t-fast) var(--ease);
}
.terms__head:hover{color:var(--blue)}
.terms__no{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  color:var(--neon);flex:0 0 auto;
}
.terms__chev{
  flex:0 0 auto;margin-left:auto;
  width:8px;height:8px;
  border-right:1px solid var(--mist);
  border-bottom:1px solid var(--mist);
  transform:rotate(45deg);
  transition:transform var(--t-mid) var(--ease),border-color var(--t-mid) var(--ease);
}
.terms__item[data-open] .terms__chev{
  transform:rotate(-135deg);border-color:var(--cyan);
}
.terms__panel{
  display:grid;grid-template-rows:0fr;
  transition:grid-template-rows var(--t-mid) var(--ease);
}
.terms__item[data-open] .terms__panel{grid-template-rows:1fr}
.terms__panel > div{overflow:hidden}
.terms__body{
  padding:0 14px 14px;
  font-size:13.5px;line-height:1.8;color:var(--mist);max-width:60ch;
}

/* ---- legal ---- */
.foot__legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;
  margin-top:clamp(32px,4.4vw,54px);
  padding-top:20px;
  border-top:1px solid var(--steel);
  font-size:12.5px;color:var(--mist);
}
.foot__icp{font-family:var(--mono);font-size:12px;letter-spacing:.06em}
.foot__legal-links{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.foot__legal-links a{color:var(--mist);transition:color var(--t-fast) var(--ease)}
.foot__legal-links a:hover{color:var(--blue)}
.foot__note{
  margin-top:14px;
  font-size:12px;line-height:1.7;color:var(--mist);opacity:.7;max-width:70ch;
}

/* ---------- 11. Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:28px;z-index:300;
  padding:10px 18px;border-radius:var(--r);
  background:rgba(16,20,27,.97);
  border:1px solid rgba(79,209,197,.5);
  color:var(--frost);font-size:13px;
  opacity:0;pointer-events:none;
  transform:translate(-50%,14px);
  transition:opacity var(--t-mid) var(--ease),transform var(--t-mid) var(--ease);
}
.toast[data-show]{opacity:1;transform:translate(-50%,0)}

/* ---------- 12. Tablet ---------- */
@media (max-width:1023px){
  html{scroll-padding-top:70px}
  body{padding-left:0;font-size:16px}

  .rail{
    position:sticky;top:0;left:auto;bottom:auto;
    width:100%;height:60px;
    flex-direction:row;align-items:center;justify-content:space-between;
    padding:0 14px;
    border-right:0;border-bottom:1px solid var(--steel);
    background:rgba(5,7,11,.94);
    backdrop-filter:blur(10px);
  }
  .rail::after{
    top:auto;bottom:-1px;right:0;left:0;width:auto;height:1px;
    background:linear-gradient(90deg,var(--cyan),var(--blue) 52%,rgba(127,182,217,0));
  }
  .rail__brand{padding:0;border-bottom:0;text-align:left}
  .rail__brand-name{font-size:14px;letter-spacing:.02em}
  .rail__brand-sub{display:none}

  .rail__toggle{display:flex}

  .rail__nav{
    position:fixed;top:0;left:0;bottom:0;z-index:90;
    width:min(82vw,320px);
    justify-content:flex-start;
    padding:88px 0 28px;
    background:linear-gradient(180deg,#0A1018 0%,#05070B 100%);
    border-right:1px solid var(--brushed);
    transform:translateX(-102%);
    transition:transform var(--t-slow) var(--ease);
  }
  .rail__nav[data-open]{transform:translateX(0)}
  .rail__list{gap:0}
  .rail__list a{
    padding:16px 24px;text-align:left;
    font-size:15px;letter-spacing:.06em;
    border-left:0;
    border-bottom:1px solid rgba(46,55,66,.5);
  }
  .rail__list a[aria-current="page"]{
    background:linear-gradient(90deg,rgba(79,209,197,.18),transparent);
    box-shadow:inset 3px 0 0 var(--cyan);
    border-left-color:transparent;
  }

  .rail__tools{
    flex-direction:row;align-items:center;gap:8px;
    padding:0;border-top:0;
  }
  .rail__tool{
    width:auto;padding:7px 9px;font-size:10.5px;letter-spacing:.02em;
  }
  .rail__tool[data-to-top]{transform:none}

  .grid--12{grid-template-columns:repeat(8,minmax(0,1fr))}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .col-3,.col-4,.col-6{grid-column:span 4}
  .col-8,.col-9,.col-12{grid-column:span 8}

  .foot__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot__col--rules{grid-column:1/-1;order:-1}
}

/* ---------- 13. Phone ---------- */
@media (max-width:639px){
  body{font-size:16px;line-height:1.8}
  .rail{height:56px;padding:0 12px}
  .rail__brand-name{font-size:13px}
  .rail__tools{gap:6px}
  .rail__tool{padding:6px 8px;font-size:10px}

  .grid--12{grid-template-columns:repeat(4,minmax(0,1fr))}
  .grid--3,.grid--4,.grid--2{grid-template-columns:1fr}
  .col-3,.col-4,.col-6,.col-8,.col-9,.col-12{grid-column:1/-1}

  .foot__grid{grid-template-columns:1fr;gap:34px}
  .foot__legal{flex-direction:column;align-items:flex-start}
  .foot__top .btn{width:100%}
}

@media (max-width:379px){
  .rail__tools{display:none}
}

/* ---------- 14. Motion preference ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .rail__list a:hover,
  .card:hover,
  .btn:hover{transform:none}
}