/* ==========================================================================
   博亚娱乐官网 · 共享站点套件  /assets/site.css
   叙事：夜色中的暖光剧场 —— 深墨蓝长卷 / 暖金主光 / 青瓷绿标签
   ========================================================================== */

/* ---------- 1. 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,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit}
button{font:inherit;color:inherit}
[hidden]{display:none !important}

/* ---------- 2. 设计令牌 ---------- */
:root{
  --ink:#0B1220;
  --panel:#111C30;
  --panel-2:#16243B;
  --gold:#F2C46D;
  --amber:#E08A3C;
  --celadon:#6FAF9F;
  --paper:#F4EBDD;
  --mist:#8FA0B8;
  --line:#B8873E;
  --glow:rgba(242,196,109,.16);
  --line-soft:rgba(184,135,62,.28);
  --line-faint:rgba(184,135,62,.16);
  --rail:248px;
  --topbar:64px;
  --gutter:clamp(18px,4vw,40px);
  --maxw:1180px;
  --radius:10px;
  --radius-sm:6px;
  --font-display:"PingFang SC","Hiragino Sans GB","Heiti SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-serif:"Songti SC","Source Han Serif SC","Noto Serif SC","SimSun",serif;
  --font-mono:ui-monospace,"SFMono-Regular","IBM Plex Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.3,.7,.3,1);
}

/* ---------- 3. 基础排版与底色 ---------- */
body{
  background-color:var(--ink);
  background-image:
    radial-gradient(58vw 52vw at 6% -8%,rgba(242,196,109,.10),transparent 62%),
    radial-gradient(46vw 40vw at 104% 108%,rgba(111,175,159,.08),transparent 62%);
  background-repeat:no-repeat;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  overflow-x:clip;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.28;letter-spacing:.06em}
p{max-width:40ch}
::selection{background:rgba(242,196,109,.3);color:var(--paper)}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px;border-radius:3px;box-shadow:0 0 0 4px rgba(11,18,32,.95)}
#main-content{display:block}

/* 桌面端为左侧光带让出空间 */
@media (min-width:1024px){
  body{padding-left:var(--rail)}
}

/* ---------- 4. 通用工具 ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(44px,7vw,96px)}
.section--tight{padding-block:clamp(28px,4vw,56px)}
.u-mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.4vw,32px)}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}
@media (max-width:899px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 6}
}

/* ---------- 5. 跳过链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:12px;z-index:200;
  transform:translateY(-180%);
  background:var(--gold);color:#141005;
  padding:10px 18px;border-radius:var(--radius-sm);
  font-size:13px;letter-spacing:.08em;text-decoration:none;
  box-shadow:0 10px 30px rgba(0,0,0,.45);
  transition:transform .22s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:none}
@media (min-width:1024px){.skip-link{left:calc(var(--rail) + 14px)}}

/* ---------- 6. 页头：光带式框架导航 ---------- */
.site-frame{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg,#0D1626 0%,#0B1220 100%);
  border-bottom:1px solid var(--line-soft);
}
.frame-top{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  min-height:var(--topbar);padding:8px var(--gutter);
}
.frame-brand{display:flex;align-items:center;gap:12px;text-decoration:none;min-width:0}
.frame-brand__mark{
  flex:0 0 auto;width:38px;height:38px;display:grid;place-items:center;
  border:1px solid var(--line);border-radius:50%;
  font-family:var(--font-display);font-size:16px;line-height:1;
  color:var(--gold);
  background:radial-gradient(circle at 50% 34%,rgba(242,196,109,.32),transparent 72%);
  box-shadow:inset 0 0 18px rgba(242,196,109,.2);
}
.frame-brand__text{display:flex;flex-direction:column;gap:1px;min-width:0}
.frame-brand__name{
  font-family:var(--font-display);font-size:16px;font-weight:600;
  letter-spacing:.09em;color:var(--paper);white-space:nowrap;
}
.frame-brand__tagline{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;
  color:var(--celadon);white-space:nowrap;
}

/* 移动菜单按钮 */
.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;flex:0 0 auto;
  padding:9px 13px;border:1px solid var(--line-soft);border-radius:var(--radius-sm);
  background:rgba(242,196,109,.05);color:var(--paper);
  font-size:12.5px;letter-spacing:.14em;cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease),background-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);color:var(--gold)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars i{
  display:block;height:1.5px;width:100%;background:var(--gold);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child{transform:translateY(2.75px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child{transform:translateY(-2.75px) rotate(-45deg)}

/* 导航面板 */
.frame-nav{
  display:flex;flex-direction:column;
  background:linear-gradient(180deg,#101B2D 0%,#0A1120 100%);
  border-top:1px solid var(--line-soft);
  padding:18px var(--gutter) 30px;
  overscroll-behavior:contain;
}
.frame-nav__label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.26em;
  color:var(--mist);text-transform:uppercase;margin-bottom:12px;
}
.frame-nav__list{display:flex;flex-direction:column;gap:2px}
.frame-nav__link{
  display:flex;align-items:baseline;gap:12px;
  padding:11px 12px 11px 14px;
  border-left:2px solid transparent;border-radius:var(--radius-sm);
  font-family:var(--font-display);font-size:15.5px;letter-spacing:.07em;
  color:var(--paper);text-decoration:none;
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.frame-nav__index{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--mist)}
.frame-nav__link:hover{color:var(--gold);background:rgba(242,196,109,.07);border-left-color:var(--line)}
.frame-nav__link[aria-current="page"]{
  color:var(--gold);
  background:linear-gradient(90deg,rgba(242,196,109,.18),rgba(242,196,109,0) 92%);
  border-left-color:var(--gold);
  box-shadow:inset 0 0 0 1px rgba(242,196,109,.14);
}
.frame-nav__link[aria-current="page"] .frame-nav__index{color:var(--amber)}

/* 快捷入口 */
.frame-utility{margin-top:22px;padding-top:16px;border-top:1px dashed rgba(184,135,62,.32)}
.frame-utility__label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.24em;
  color:var(--mist);margin-bottom:10px;
}
.frame-utility__list{display:flex;flex-wrap:wrap;gap:8px}
.frame-utility__link{
  display:inline-block;padding:5px 11px;border-radius:999px;
  border:1px solid rgba(111,175,159,.36);background:rgba(111,175,159,.08);
  color:var(--celadon);font-size:12.5px;letter-spacing:.06em;text-decoration:none;
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease);
}
.frame-utility__link:hover{background:var(--celadon);border-color:var(--celadon);color:#08131A}

.frame-cta{margin-top:24px;align-self:flex-start}
.frame-note{
  margin-top:12px;font-family:var(--font-mono);font-size:10.5px;
  letter-spacing:.1em;color:var(--mist);
}

/* 滚动光带 */
.read-beam{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(184,135,62,.18);overflow:hidden;pointer-events:none;
  --read:0;
}
.read-beam__fill{
  display:block;height:100%;
  width:calc(var(--read,0) * 100%);
  background:linear-gradient(90deg,var(--gold),var(--amber));
  box-shadow:0 0 12px rgba(242,196,109,.6);
}

/* 移动端抽屉：默认收起，[data-open] 展开 */
@media (max-width:1023.98px){
  .frame-nav{
    position:fixed;left:0;right:0;top:var(--topbar);bottom:0;z-index:59;
    overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-10px);
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s;
  }
  .frame-nav[data-open]{
    opacity:1;visibility:visible;pointer-events:auto;transform:none;
  }
  .frame-nav__link{padding-block:14px;font-size:16.5px}
}

/* 桌面端：固定左栏光带 */
@media (min-width:1024px){
  .site-frame{
    position:fixed;top:0;left:0;bottom:0;
    width:var(--rail);height:100dvh;
    display:flex;flex-direction:column;
    padding:26px 22px 24px;
    border-bottom:0;border-right:1px solid var(--line-soft);
    overflow-y:auto;
    background:linear-gradient(180deg,#0D1728 0%,#0B1220 68%,#0A101B 100%);
    scrollbar-width:thin;scrollbar-color:rgba(184,135,62,.4) transparent;
  }
  .site-frame::after{
    content:"";position:absolute;top:0;right:-1px;bottom:0;width:1px;
    background:linear-gradient(180deg,transparent,rgba(242,196,109,.55) 26%,rgba(111,175,159,.4) 68%,transparent);
  }
  .frame-top{padding:0 0 24px;min-height:0;border-bottom:1px solid var(--line-faint);margin-bottom:22px}
  .nav-toggle{display:none}
  .frame-brand__name{white-space:normal;font-size:16.5px}
  .frame-nav{
    flex:1 1 auto;border-top:0;padding:0;background:transparent;overflow:visible;
  }
  .frame-cta{margin-top:auto}
  .read-beam{
    left:auto;right:0;top:0;bottom:0;width:2px;height:auto;
  }
  .read-beam__fill{
    width:100%;height:calc(var(--read,0) * 100%);
    background:linear-gradient(180deg,var(--gold),var(--amber));
  }
}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border:1px solid transparent;border-radius:999px;
  font-family:var(--font-display);font-size:14px;letter-spacing:.1em;
  text-decoration:none;cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.btn--gold{
  background:linear-gradient(135deg,var(--gold),var(--amber));
  color:#171005;
  box-shadow:0 8px 24px -10px rgba(224,138,60,.65);
}
.btn--gold:hover{box-shadow:0 12px 30px -10px rgba(242,196,109,.8)}
.btn--ghost{
  background:rgba(242,196,109,.05);border-color:var(--line-soft);color:var(--paper);
}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn--sm{padding:8px 16px;font-size:12.5px}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(56px,8vw,110px);
  background:linear-gradient(180deg,#0C1524 0%,#0A1019 100%);
  border-top:1px solid var(--line-soft);
}
.footer-band{
  height:2px;
  background:linear-gradient(90deg,rgba(242,196,109,.9),rgba(224,138,60,.6) 34%,rgba(111,175,159,.42) 62%,transparent 94%);
}
.footer-inner{
  max-width:var(--maxw);margin-inline:auto;
  padding:clamp(34px,5vw,62px) var(--gutter) clamp(26px,4vw,44px);
  display:grid;grid-template-columns:1fr;gap:clamp(28px,4vw,46px);
}
@media (min-width:720px){
  .footer-inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (min-width:1024px){
  .footer-inner{grid-template-columns:1.05fr 1.3fr .95fr;align-items:start}
  .footer-brand{grid-column:auto}
  .footer-contact{border-left:1px solid var(--line-faint);padding-left:clamp(18px,2.5vw,30px)}
}
.footer-brand__mark{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.3em;
  color:var(--celadon);text-transform:uppercase;
}
.footer-brand__line{
  margin-top:12px;font-family:var(--font-display);
  font-size:clamp(16px,2.2vw,19px);letter-spacing:.09em;color:var(--gold);
  text-shadow:0 0 24px rgba(242,196,109,.28);
  max-width:22ch;
}
.footer-brand__note{
  margin-top:14px;font-size:13.5px;line-height:1.9;color:var(--mist);max-width:36ch;
}
.footer-groups{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2.4vw,28px)}
@media (max-width:520px){.footer-groups{grid-template-columns:repeat(2,minmax(0,1fr))}}
.footer-group__title{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.24em;
  color:var(--celadon);margin-bottom:12px;
}
.footer-group__list{display:flex;flex-direction:column;gap:1px}
.footer-group__link{
  display:inline-block;padding:5px 0;font-size:14px;color:var(--paper);
  text-decoration:none;border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-group__link:hover{color:var(--gold);border-bottom-color:var(--line)}
.footer-contact__title{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.24em;
  color:var(--celadon);margin-bottom:12px;
}
.footer-contact__row{display:flex;gap:10px;padding:4px 0;font-size:13.5px;line-height:1.7}
.footer-contact__key{
  flex:0 0 46px;font-family:var(--font-mono);font-size:10.5px;
  letter-spacing:.12em;color:var(--mist);padding-top:5px;
}
.footer-contact__val{color:var(--paper);overflow-wrap:anywhere}
.footer-legalbar{border-top:1px solid rgba(184,135,62,.2);background:rgba(8,13,22,.6)}
.footer-meta{
  max-width:var(--maxw);margin-inline:auto;
  padding:16px var(--gutter) 24px;
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--mist);
}
.footer-meta__links{display:flex;flex-wrap:wrap;gap:6px 18px;margin-left:auto}
.footer-meta__links a{
  color:var(--mist);text-decoration:none;border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-meta__links a:hover{color:var(--gold);border-bottom-color:var(--line)}

/* ---------- 9. 章节题头 / 导语 ---------- */
.chapter{
  display:flex;align-items:center;flex-wrap:wrap;gap:14px;
  margin-bottom:clamp(18px,3vw,30px);
}
.chapter--center{justify-content:center;text-align:center}
.chapter__index{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--celadon);
}
.chapter__rule{
  flex:0 1 64px;height:1px;
  background:linear-gradient(90deg,var(--line),transparent);
}
.chapter__title{
  font-family:var(--font-display);font-weight:600;
  font-size:clamp(20px,2.6vw,28px);letter-spacing:.1em;color:var(--paper);
}
.eyebrow{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.28em;
  text-transform:uppercase;color:var(--celadon);
}
.lede{
  font-size:clamp(15px,1.4vw,17px);line-height:1.9;color:var(--mist);max-width:40ch;
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--mist);padding-block:14px;
}
.breadcrumb a{color:var(--mist);text-decoration:none;border-bottom:1px solid transparent}
.breadcrumb a:hover{color:var(--gold);border-bottom-color:var(--line)}
.breadcrumb__sep{color:rgba(143,160,184,.5)}
.breadcrumb [aria-current="page"]{color:var(--paper)}
@media (max-width:1023.98px){
  .breadcrumb{
    position:sticky;top:var(--topbar);z-index:30;
    margin-inline:calc(var(--gutter) * -1);padding-inline:var(--gutter);
    background:rgba(11,18,32,.94);
    border-bottom:1px solid var(--line-faint);
    -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  }
}

/* ---------- 11. 面板 / 卡片 / 标签 ---------- */
.panel,.card{
  position:relative;
  background:linear-gradient(158deg,rgba(17,28,48,.94),rgba(22,36,59,.78));
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  box-shadow:inset 0 1px 0 rgba(242,196,109,.06),0 22px 46px -34px rgba(0,0,0,.95);
  transition:border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.card{padding:clamp(18px,2.6vw,28px)}
.card:hover,.panel:hover{
  border-color:rgba(242,196,109,.55);
  box-shadow:inset 0 1px 0 rgba(242,196,109,.1),0 0 0 1px rgba(242,196,109,.08),0 26px 52px -34px rgba(0,0,0,.95);
}
.exhibit-label{
  display:inline-flex;align-items:center;gap:8px;
  padding:3px 9px;border:1px solid rgba(242,196,109,.42);border-radius:3px;
  background:rgba(242,196,109,.09);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;color:var(--gold);
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border:1px solid rgba(111,175,159,.36);border-radius:999px;
  background:rgba(111,175,159,.08);color:var(--celadon);
  font-size:12px;letter-spacing:.06em;text-decoration:none;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.tag:hover{background:rgba(111,175,159,.18);color:var(--paper)}
.tag.is-active,.tag[aria-pressed="true"]{background:var(--celadon);border-color:var(--celadon);color:#08131A}

/* ---------- 12. 可访问分段切换 ---------- */
.tabs{
  display:flex;flex-wrap:wrap;gap:6px;
  padding:5px;border:1px solid var(--line-soft);border-radius:999px;
  background:rgba(17,28,48,.72);
  width:fit-content;max-width:100%;
}
.tabs__btn{
  appearance:none;border:1px solid transparent;background:transparent;
  color:var(--mist);font-size:13px;letter-spacing:.08em;
  padding:8px 16px;border-radius:999px;cursor:pointer;
  transition:color .18s var(--ease),background-color .18s var(--ease),box-shadow .18s var(--ease);
}
.tabs__btn:hover{color:var(--paper);background:rgba(242,196,109,.08)}
.tabs__btn[aria-selected="true"],.tabs__btn.is-active{
  color:#0B1220;background:linear-gradient(135deg,var(--gold),var(--amber));
  box-shadow:0 6px 18px -8px rgba(224,138,60,.85);
}
.tabs__panel{padding-top:clamp(16px,2.4vw,26px)}

/* ---------- 13. 图片占位容器 ---------- */
.media-frame{
  position:relative;overflow:hidden;border-radius:var(--radius);
  border:1px solid var(--line-soft);
  aspect-ratio:16 / 9;
  background:
    radial-gradient(120% 100% at 18% 0%,rgba(242,196,109,.2),transparent 62%),
    linear-gradient(150deg,#16243B,#0B1220);
}
.media-frame__img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.media-frame__label{
  position:absolute;left:12px;top:12px;z-index:2;
  padding:3px 9px;border:1px solid rgba(242,196,109,.4);border-radius:3px;
  background:rgba(11,18,32,.7);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;color:var(--gold);
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--square{aspect-ratio:1 / 1}

/* ---------- 14. 进入动画 ---------- */
html[data-reveal-ready] [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
html[data-reveal-ready] [data-reveal][data-revealed]{opacity:1;transform:none}

/* ---------- 15. 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;
  }
  html[data-reveal-ready] [data-reveal]{opacity:1;transform:none;transition:none}
}

/* ---------- 16. 平板微调 ---------- */
@media (min-width:768px) and (max-width:1023.98px){
  .frame-brand__name{font-size:17px}
  .frame-nav{padding-inline:clamp(24px,5vw,52px)}
}