/* ===========================================================
   博万游艺 /assets/site.css
   共享外壳样式：reset、变量、中文排版、头部、页脚、通用组件
   =========================================================== */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
[id]{scroll-margin-top:116px}
[hidden]{display:none !important}

/* ---------- 变量 ---------- */
:root{
  --bg:#070B1F;
  --surface:#0F1736;
  --surface-2:#131C3E;
  --line:#26305A;
  --cyan:#35E6D0;
  --violet:#8B5CF6;
  --violet-soft:#B69CFF;
  --gold:#F2B33D;
  --service:#4D8DFF;
  --coral:#FF7A6B;
  --ink:#E9EDF7;
  --muted:#98A2C0;
  --dim:#5C6788;
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --wrap:1240px;
  --gut:clamp(16px,4vw,40px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --radius:0px;
}

/* ---------- 基础排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--bg);
  background-image:
    radial-gradient(58% 44% at 84% 2%, rgba(139,92,246,.20), transparent 72%),
    radial-gradient(52% 40% at 4% 96%, rgba(53,230,208,.12), transparent 74%),
    linear-gradient(to right, rgba(38,48,90,.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(38,48,90,.42) 1px, transparent 1px);
  background-size:100% 100%,100% 100%,88px 88px,88px 88px;
  background-attachment:fixed,fixed,scroll,scroll;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:900;line-height:1.12;letter-spacing:.02em;color:var(--ink)}
p,li{font-size:16px;line-height:1.8}
strong{font-weight:700}
::selection{background:rgba(53,230,208,.28);color:#fff}

.display{font-family:var(--font-display);font-weight:900;font-size:clamp(40px,7vw,88px);line-height:1.05;letter-spacing:.02em}
.section-title{font-size:clamp(22px,3.2vw,38px);line-height:1.15}
.eyebrow{display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.3em;color:var(--cyan);text-transform:uppercase}
.lede{font-size:clamp(15px,1.3vw,18px);line-height:1.9;color:var(--muted);max-width:44ch}
.prose{max-width:44ch}
.prose p{color:var(--muted)}
.prose p+p{margin-top:1em}
.prose strong{color:var(--ink)}
.mono-text{font-family:var(--font-mono);letter-spacing:.08em}
.muted{color:var(--muted)}
.anno{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.3em;color:var(--dim);text-transform:uppercase;line-height:1.9}

/* ---------- 布局 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gut)}
.section{position:relative;z-index:1;padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(26px,4vw,52px)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;
  padding-bottom:18px;margin-bottom:clamp(20px,3vw,36px);border-bottom:1px solid var(--line);
}
.stack{display:flex;flex-direction:column;gap:clamp(12px,1.8vw,22px)}
.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--4-8{grid-template-columns:4fr 8fr}
.rule{height:1px;background:linear-gradient(90deg,var(--line),transparent)}
.rule--slant{transform:rotate(-1.2deg);transform-origin:left}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;left:12px;top:-80px;z-index:999;
  padding:10px 18px;background:var(--gold);color:#120C00;font-weight:700;font-size:14px;
  letter-spacing:.06em;transition:top .2s var(--ease);
}
.skip-link:focus{top:10px}

/* ---------- 焦点 ---------- */
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.btn:focus-visible,.nav-toggle:focus-visible,.footer-link:focus-visible{outline-offset:2px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.7em 1.2em;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--surface);color:var(--ink);
  font-size:14px;letter-spacing:.08em;line-height:1.4;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn:hover{background:var(--surface-2);border-color:var(--violet)}
.btn--gold{background:var(--gold);border-color:var(--gold);color:#141005;font-weight:700}
.btn--gold:hover{background:#FFC65F;border-color:#FFC65F;color:#141005}
.btn--line{background:transparent;border-color:var(--cyan);color:var(--cyan)}
.btn--line:hover{background:rgba(53,230,208,.1);border-color:var(--cyan);color:var(--cyan)}
.btn--ghost{background:transparent}
.btn--ghost:hover{border-color:var(--line);color:var(--ink)}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(7,11,31,.94);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-strip{
  max-height:140px;overflow:hidden;
  border-bottom:1px solid var(--line);
  background:linear-gradient(90deg,rgba(15,23,54,.92),rgba(7,11,31,.55) 70%);
  transition:max-height .34s var(--ease),opacity .24s var(--ease),border-color .24s var(--ease);
}
.site-header.is-condensed .header-strip{max-height:0;opacity:0;border-bottom-color:transparent}
.header-strip__inner{display:flex;align-items:center;flex-wrap:wrap;gap:clamp(12px,2vw,28px);min-height:58px;padding-block:8px}

.brand{display:inline-flex;align-items:center;gap:11px;flex:0 0 auto;padding:4px 0}
.brand__mark{
  display:grid;place-items:center;width:36px;height:36px;
  border:1px solid var(--cyan);color:var(--cyan);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  animation:bw-breathe 6s ease-in-out infinite;
}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__name{font-family:var(--font-display);font-weight:900;font-size:17px;letter-spacing:.1em}
.brand__domain{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;color:var(--muted)}
@keyframes bw-breathe{
  0%,100%{box-shadow:inset 0 0 8px rgba(53,230,208,.16)}
  50%{box-shadow:inset 0 0 20px rgba(53,230,208,.42)}
}

.header-info{display:flex;align-items:center;justify-content:flex-end;gap:clamp(12px,2vw,26px);flex:1 1 auto}
.header-meta{display:flex;align-items:center;flex-wrap:wrap;gap:clamp(10px,1.6vw,22px);font-size:12.5px;color:var(--muted)}
.meta-item{display:inline-flex;align-items:baseline;gap:7px;white-space:nowrap}
.meta-item__k{font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;color:var(--dim);text-transform:uppercase}
.nav-cta{flex:0 0 auto}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;border:1px solid var(--line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--ink);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle__bars{position:relative;width:15px;height:2px;background:var(--cyan);box-shadow:0 5px 0 var(--cyan),0 -5px 0 var(--cyan);transition:background .2s var(--ease),box-shadow .2s var(--ease)}
.site-header[data-open] .nav-toggle{border-color:var(--gold);color:var(--gold)}
.site-header[data-open] .nav-toggle__bars{background:var(--gold);box-shadow:0 5px 0 var(--gold),0 -5px 0 var(--gold)}

.site-nav{background:linear-gradient(90deg,rgba(15,23,54,.86),rgba(7,11,31,.96))}
.site-nav__inner{display:flex;align-items:center;gap:clamp(10px,2vw,26px)}
.site-nav__label{
  flex:0 0 auto;padding-right:14px;border-right:1px solid var(--line);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.3em;color:var(--dim);
}
.nav-rail{
  display:flex;align-items:stretch;flex:1 1 auto;
  gap:clamp(4px,1vw,16px);
  overflow-x:auto;overflow-y:hidden;
  scroll-snap-type:x proximity;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;scrollbar-color:var(--line) transparent;
}
.nav-rail::-webkit-scrollbar{height:4px}
.nav-rail::-webkit-scrollbar-track{background:transparent}
.nav-rail::-webkit-scrollbar-thumb{background:var(--line)}
.nav-link{
  --accent:var(--ink);
  position:relative;display:inline-flex;align-items:center;gap:8px;
  padding:17px 6px 15px;white-space:nowrap;scroll-snap-align:start;
  font-size:15px;font-weight:500;letter-spacing:.05em;color:var(--muted);
  transition:color .2s var(--ease);
}
.nav-link__no{font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;color:var(--dim);transition:color .2s var(--ease)}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .28s var(--ease);
}
.nav-link:hover{color:var(--ink)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link:hover .nav-link__no,.nav-link:focus-visible .nav-link__no{color:var(--accent)}
.nav-link[aria-current="page"]{color:var(--ink);font-weight:700}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"] .nav-link__no{color:var(--accent)}
.nav-link[data-accent="ink"]{--accent:#E9EDF7}
.nav-link[data-accent="service"]{--accent:#4D8DFF}
.nav-link[data-accent="violet"]{--accent:#B69CFF}
.nav-link[data-accent="gold"]{--accent:#F2B33D}
.nav-link[data-accent="cyan"]{--accent:#35E6D0}
.nav-link[data-accent="coral"]{--accent:#FF7A6B}
.nav-hint{flex:0 0 auto;font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--dim)}

.header-progress{
  position:absolute;left:0;bottom:-1px;width:100%;height:2px;opacity:0;
  background:linear-gradient(90deg,var(--cyan),var(--violet),var(--gold));
  transform:scaleX(0);transform-origin:left;
  transition:opacity .3s var(--ease);
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(48px,8vw,104px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(10,16,40,.96),rgba(7,11,31,.99));
}
.footer-top{
  display:grid;grid-template-columns:1.5fr 1fr .9fr 1.5fr;
  gap:clamp(22px,3vw,44px);
  padding-block:clamp(32px,5vw,58px);
}
.footer-brand__name{font-family:var(--font-display);font-weight:900;font-size:22px;letter-spacing:.1em}
.footer-brand__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--cyan);margin-top:8px}
.footer-brand__line{margin-top:14px;font-size:14.5px;line-height:1.9;color:var(--muted);max-width:28ch}
.footer-col__title{
  padding-bottom:10px;margin-bottom:14px;border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.3em;color:var(--muted);text-transform:uppercase;
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-flex;align-items:center;gap:9px;
  font-size:14.5px;color:var(--ink);
  transition:color .2s var(--ease);
}
.footer-link::before{content:"";width:9px;height:1px;background:var(--cyan);flex:0 0 auto;transition:width .2s var(--ease)}
.footer-link:hover{color:var(--cyan)}
.footer-link:hover::before{width:16px}
.footer-contact__row{display:flex;align-items:flex-start;gap:10px;margin-bottom:10px}
.footer-k{
  flex:0 0 42px;padding-top:3px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--dim);text-transform:uppercase;
}
.footer-value{font-size:14.5px;line-height:1.75;color:var(--ink)}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;
  padding-block:18px;border-top:1px solid var(--line);
}
.footer-legal__note{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--muted)}

/* ---------- 通用组件 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:18px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:var(--muted);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item+.breadcrumb__item::before{content:"/";color:#3B4569}
.breadcrumb a{transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}

.panel{
  position:relative;
  border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(15,23,54,.94),rgba(15,23,54,.62));
}
.panel__head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:13px 18px;border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--muted);text-transform:uppercase;
}
.panel__body{padding:clamp(16px,2.4vw,28px)}
.panel--accent{--accent:var(--cyan)}
.panel--accent::before{content:"";position:absolute;left:-1px;top:-1px;width:42px;height:2px;background:var(--accent)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--muted);
}
.tag--cyan{border-color:rgba(53,230,208,.48);color:var(--cyan)}
.tag--violet{border-color:rgba(182,156,255,.48);color:var(--violet-soft)}
.tag--gold{border-color:rgba(242,179,61,.48);color:var(--gold)}
.tag--coral{border-color:rgba(255,122,107,.48);color:var(--coral)}

.index-table{
  width:100%;font-size:14px;
  border:1px solid var(--line);
  background:rgba(15,23,54,.62);
}
.index-table th,.index-table td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.index-table th{
  background:rgba(7,11,31,.7);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;color:var(--muted);text-transform:uppercase;font-weight:400;
}
.index-table td:first-child{width:78px;font-family:var(--font-mono);color:var(--dim);letter-spacing:.08em}
.index-table tbody tr:last-child td{border-bottom:0}
.index-table tbody tr:hover{background:rgba(53,230,208,.06)}
.index-table a{color:var(--ink);border-bottom:1px solid var(--line)}
.index-table a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

.note{
  border-left:2px solid var(--gold);
  background:rgba(242,179,61,.07);
  padding:12px 16px;font-size:14.5px;color:var(--ink);
}
.status-dot{display:inline-block;width:7px;height:7px;background:var(--cyan);box-shadow:0 0 0 3px rgba(53,230,208,.16)}
.status-dot--coral{background:var(--coral);box-shadow:0 0 0 3px rgba(255,122,107,.16)}

.rail{
  display:flex;gap:clamp(12px,2vw,22px);
  overflow-x:auto;overflow-y:hidden;
  padding-bottom:14px;
  scroll-snap-type:x proximity;
  -webkit-overflow-scrolling:touch;
  cursor:grab;
  scrollbar-width:thin;scrollbar-color:var(--line) transparent;
}
.rail::-webkit-scrollbar{height:4px}
.rail::-webkit-scrollbar-thumb{background:var(--line)}
.rail.is-dragging{cursor:grabbing;user-select:none;scroll-snap-type:none}
.rail__item{flex:0 0 min(330px,78vw);scroll-snap-align:start}

.media-frame{
  position:relative;width:100%;aspect-ratio:16/10;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--radius);
  background:var(--surface);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame__inner{
  position:absolute;inset:0;display:grid;place-items:center;
  background:linear-gradient(135deg,rgba(53,230,208,.16),rgba(139,92,246,.2) 55%,rgba(7,11,31,.92));
  color:var(--dim);font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::before,.media-frame::after{
  content:"";position:absolute;width:18px;height:18px;border:1px solid var(--cyan);pointer-events:none;
}
.media-frame::before{top:8px;left:8px;border-right:0;border-bottom:0}
.media-frame::after{bottom:8px;right:8px;border-left:0;border-top:0}

/* ---------- 显现 ---------- */
.reveal-ready [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .4s var(--ease),transform .4s var(--ease);
}
.reveal-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .site-nav__label,.nav-hint{display:none}
  .footer-top{grid-template-columns:1.4fr 1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:980px){
  .footer-top{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:900px){
  .grid--5-7,.grid--4-8{grid-template-columns:1fr}
}
@media (max-width:860px){
  .header-strip__inner{gap:10px;padding-block:10px}
  .brand{order:1;margin-right:auto}
  .nav-toggle{order:2;display:inline-flex}
  .header-info{
    order:3;flex:1 0 100%;display:none;
    flex-direction:column;align-items:stretch;justify-content:flex-start;
    gap:14px;padding-top:14px;border-top:1px dashed var(--line);
  }
  .site-header[data-open] .header-info{display:flex}
  .header-meta{flex-direction:column;align-items:flex-start;gap:8px}
  .meta-item{white-space:normal}
  .nav-cta{width:100%}
  .nav-link{padding:15px 4px 13px;font-size:14.5px}
  .brand__name{font-size:16px}
}
@media (max-width:600px){
  .footer-top{grid-template-columns:1fr}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .index-table{font-size:13px}
  .index-table th,.index-table td{padding:10px 10px}
  .index-table td:first-child{width:56px}
  .rail__item{flex:0 0 84vw}
}

/* ---------- 无障碍动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .header-strip{transition:none}
  .reveal-ready [data-reveal]{opacity:1 !important;transform:none !important}
  .brand__mark{animation:none}
  .rail{scroll-behavior:auto}
}