/* ============================================================
   百利宫看台 · 共享样式 / assets/site.css
   归档看台：雾灰纸底 · 矿物青实色 · 宫墙朱红标记 · 琥珀刻度
   ============================================================ */

:root{
  --paper-bg:#F2F1ED;
  --sheet:#FBFAF7;
  --ink:#23262B;
  --ink-2:#5C6167;
  --rule:#D8D5CD;
  --mineral:#2F4F52;
  --cyan-deep:#3F6E70;
  --cyan-pale:#7FA9AA;
  --vermilion:#B4372A;
  --vermilion-deep:#8E2A20;
  --amber:#C98A2E;
  --amber-deep:#8A5C1A;
  --deep:#16201F;

  --font-display:"Source Han Serif SC","Noto Serif SC","Songti SC",serif;
  --font-head:"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-body:"PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,monospace;

  --header-rail-h:34px;
  --header-main-h:80px;
  --header-h:calc(var(--header-rail-h) + var(--header-main-h));

  --dur:220ms;
  --dur-fast:140ms;
  --ease:cubic-bezier(.22,.68,.28,1);

  --shadow-paper:6px 6px 0 -1px rgba(216,213,205,.55);
  --shadow-lift:0 18px 36px -28px rgba(22,32,31,.78);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 18px);
}
body{
  margin:0;
  background-color:var(--paper-bg);
  background-image:linear-gradient(to bottom, rgba(216,213,205,.4) 1px, transparent 1px);
  background-size:100% 112px;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
#main-content{display:block}

/* ---------- 中文排版 ---------- */
h1,h2,h3,h4{font-family:var(--font-head);font-weight:700;line-height:1.34;letter-spacing:.01em}
h1{font-family:var(--font-display);font-size:clamp(26px,3.4vw,44px);line-height:1.28;letter-spacing:.01em}
h2{font-size:22px}
h3{font-size:18px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}

/* ---------- 焦点 ---------- */
:focus-visible{outline:2px solid var(--vermilion);outline-offset:3px}
.site-header[data-scrolled] :focus-visible,
.site-footer :focus-visible,
.plate--ink :focus-visible{outline-color:var(--amber)}

/* ---------- 容器 ---------- */
.wrap{width:min(1240px,100% - 64px);margin-inline:auto}

/* ---------- 跳链 ---------- */
.skip-link{
  position:fixed;
  left:16px;
  top:-90px;
  z-index:200;
  padding:12px 20px;
  background:var(--deep);
  color:var(--sheet);
  font-size:14px;
  font-weight:600;
  letter-spacing:.06em;
  text-decoration:none;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:10px}

/* ============================================================
   头部
   ============================================================ */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:80;
  color:var(--ink);
  background-color:transparent;
  transition:background-color 260ms var(--ease),color 260ms var(--ease),box-shadow 260ms var(--ease);
}
.site-header[data-scrolled]{
  background-color:var(--mineral);
  color:var(--sheet);
  box-shadow:0 1px 0 rgba(251,250,247,.14),0 26px 46px -40px rgba(22,32,31,.95);
}

/* 顶部状态条 */
.header-rail{border-bottom:1px solid rgba(92,97,103,.16);transition:border-color 260ms var(--ease)}
.site-header[data-scrolled] .header-rail{border-bottom-color:rgba(251,250,247,.16)}
.header-rail__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  min-height:var(--header-rail-h);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--ink-2);
  transition:color 260ms var(--ease);
}
.site-header[data-scrolled] .header-rail__inner{color:rgba(251,250,247,.68)}
.header-rail__status{
  display:flex;
  align-items:center;
  gap:6px;
  min-width:0;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.header-rail__meta{margin-left:auto;white-space:nowrap}
.rail-dot{flex:0 0 6px;width:6px;height:6px;background:var(--amber)}
.rail-sep{color:var(--rule)}
.site-header[data-scrolled] .rail-sep{color:rgba(251,250,247,.28)}

/* 品牌与主行 */
.header-main__inner{display:flex;align-items:center;gap:26px;min-height:var(--header-main-h)}
.brand{display:flex;flex-direction:column;gap:3px;padding:8px 0;text-decoration:none;color:inherit}
.brand__name{
  position:relative;
  padding-bottom:5px;
  font-family:var(--font-display);
  font-size:24px;
  font-weight:700;
  line-height:1.1;
  letter-spacing:.02em;
}
.brand__name::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:26px;height:2px;
  background:var(--vermilion);
  transition:width var(--dur) var(--ease);
}
.brand:hover .brand__name::after{width:100%}
.brand__tagline{font-size:12px;line-height:1.5;letter-spacing:.14em;color:var(--ink-2);transition:color 260ms var(--ease)}
.site-header[data-scrolled] .brand__tagline{color:rgba(251,250,247,.66)}
.brand__note{
  align-self:center;
  height:calc(var(--header-main-h) - 28px);
  margin-left:4px;
  padding-left:9px;
  border-left:1px solid var(--rule);
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.34em;
  color:var(--ink-2);
  transition:color 260ms var(--ease),border-color 260ms var(--ease);
}
.site-header[data-scrolled] .brand__note{border-left-color:rgba(251,250,247,.24);color:rgba(251,250,247,.5)}

/* 导航 */
.site-nav{margin-left:auto;display:flex;align-items:center;gap:10px}
.site-nav__list{display:flex;align-items:center;gap:2px}
.site-nav__list a{
  position:relative;
  display:inline-block;
  padding:12px 14px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.03em;
  text-decoration:none;
  color:inherit;
  transition:color var(--dur-fast) var(--ease);
}
.site-nav__list a::after{
  content:"";
  position:absolute;
  left:14px;right:14px;bottom:5px;
  height:2px;
  background:var(--vermilion);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur-fast) var(--ease);
}
.site-nav__list a:hover::after,
.site-nav__list a[aria-current="page"]::after{transform:scaleX(1)}
.site-header[data-scrolled] .site-nav__list a::after{background:var(--amber)}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  text-decoration:none;
  border:1px solid transparent;
  cursor:pointer;
  transition:background-color var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease),
             border-color var(--dur-fast) var(--ease),transform var(--dur-fast) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--red{background:var(--vermilion);color:var(--sheet);border-color:var(--vermilion)}
.btn--red:hover{background:var(--vermilion-deep);border-color:var(--vermilion-deep)}
.btn--cta{margin-left:6px;white-space:nowrap}
.btn--ghost{background:transparent;border-color:var(--rule);color:inherit}
.btn--ghost:hover{border-color:var(--vermilion);color:var(--vermilion)}

/* 移动目录按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:10px 14px;
  border:1px solid currentColor;
  background:transparent;
  color:inherit;
  font-size:12px;
  font-weight:700;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease);
}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars i{display:block;height:2px;background:currentColor}
.nav-toggle__bars i:nth-child(2){width:70%}
.nav-toggle__bars i:nth-child(3){width:45%}
.nav-toggle[aria-expanded="true"]{border-color:var(--amber);color:var(--amber)}

/* 滚动进度线 */
.scroll-progress{position:absolute;left:0;right:0;bottom:0;height:2px;overflow:hidden;pointer-events:none}
.scroll-progress span{display:block;width:100%;height:100%;background:var(--vermilion);transform:scaleX(0);transform-origin:left center}

/* ============================================================
   通用组件
   ============================================================ */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--ink-2);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:6px;color:inherit}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--rule)}
.breadcrumb a{
  padding-bottom:1px;
  border-bottom:1px solid var(--rule);
  text-decoration:none;
  transition:color var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease);
}
.breadcrumb a:hover{color:var(--vermilion);border-bottom-color:var(--vermilion)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px 20px;
  padding-bottom:14px;
  border-bottom:2px solid var(--ink);
  margin-bottom:30px;
}
.section-head__title{font-size:22px;letter-spacing:.01em}
.section-head__note{margin-left:auto;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--ink-2)}

.plate{
  position:relative;
  background:var(--sheet);
  border:1px solid var(--rule);
  padding:24px 22px;
  box-shadow:var(--shadow-paper);
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.plate--tight{padding:16px}
.plate--ink{background:var(--mineral);border-color:var(--mineral);color:rgba(251,250,247,.86);box-shadow:none}
.plate--ink .plate__label{color:var(--amber);border-bottom-color:var(--amber)}
.plate--ink .note-line{border-left-color:var(--amber);color:rgba(251,250,247,.72)}
.plate__label{
  display:inline-block;
  margin-bottom:14px;
  padding-bottom:3px;
  border-bottom:1px solid var(--vermilion);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--vermilion);
}
.plate--link{display:block;text-decoration:none;color:inherit}
.plate--link:hover{transform:translateY(-2px);border-color:var(--ink);box-shadow:var(--shadow-paper),var(--shadow-lift)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--rule);
  background:var(--paper-bg);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--ink-2);
  white-space:nowrap;
}
.tag--red{border-color:rgba(180,55,42,.42);background:rgba(180,55,42,.07);color:var(--vermilion)}
.tag--amber{border-color:rgba(201,138,46,.5);background:rgba(201,138,46,.1);color:var(--amber-deep)}
.tag--cyan{border-color:rgba(63,110,112,.4);background:rgba(127,169,170,.16);color:var(--cyan-deep)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:26px}
.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 12}
@media (min-width:900px){
  .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}
}

.prose{max-width:74ch;font-size:16px;line-height:1.9;color:var(--ink)}
.prose > * + *{margin-top:1.15em}
.prose p{margin:0}
.prose h2{margin-top:2em;padding-bottom:8px;border-bottom:1px solid var(--rule);font-size:22px}
.prose h3{margin-top:1.6em;font-size:18px}
.prose ul{margin:1.1em 0 0;padding-left:1.3em}
.prose ul li{position:relative;padding-left:4px}
.prose ul li::before{content:"";position:absolute;left:-1.1em;top:.85em;width:7px;height:1px;background:var(--vermilion)}
.prose ol{margin:1.1em 0 0;padding-left:1.5em;list-style:decimal}
.prose a{padding-bottom:1px;border-bottom:1px solid var(--rule);text-decoration:none}
.prose a:hover{color:var(--vermilion);border-bottom-color:var(--vermilion)}
.prose strong{font-weight:700}

.media-frame{
  position:relative;
  display:block;
  padding:10px;
  background:var(--sheet);
  border:1px solid var(--rule);
}
.media-frame > img{
  width:100%;
  height:100%;
  object-fit:cover;
  background-color:var(--rule);
  filter:saturate(.72) contrast(.97);
}
.media-frame--wide > img{aspect-ratio:16/9}
.media-frame--tall > img{aspect-ratio:3/4}
.media-frame--square > img{aspect-ratio:1/1}
.media-frame__cap{margin-top:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--ink-2)}

.divider{height:1px;border:0;margin:0;background:var(--rule)}
.note-line{padding-left:12px;border-left:2px solid var(--amber);font-size:13px;line-height:1.75;color:var(--ink-2)}

[data-index-link]{transition:color var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease)}
[data-index-link][data-active]{color:var(--ink);border-color:var(--vermilion)}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{position:relative;background-color:var(--deep);color:rgba(251,250,247,.8)}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:3px;
  background-image:repeating-linear-gradient(90deg,var(--amber) 0 2px,transparent 2px 24px);
  opacity:.75;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.35fr .85fr .85fr 1.5fr;
  gap:48px 40px;
  padding:64px 0 44px;
}
.footer-brand__name{font-family:var(--font-display);font-size:26px;font-weight:700;letter-spacing:.02em;color:var(--sheet)}
.footer-brand__tagline{margin-top:10px;font-size:13px;letter-spacing:.1em;color:rgba(251,250,247,.6)}
.footer-brand__index{margin-top:20px;font-family:var(--font-mono);font-size:11px;letter-spacing:.34em;color:var(--amber)}
.footer-col__title{font-family:var(--font-mono);font-size:11px;font-weight:400;letter-spacing:.26em;color:var(--amber)}
.footer-col__list{margin-top:18px;display:grid;gap:11px}
.footer-col__list a{
  display:inline-block;
  padding-bottom:1px;
  border-bottom:1px solid transparent;
  font-size:14px;
  text-decoration:none;
  color:rgba(251,250,247,.78);
  transition:color var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease);
}
.footer-col__list a:hover{color:var(--sheet);border-bottom-color:var(--vermilion)}

.contact-list{margin-top:18px;display:grid;gap:16px}
.contact-list__label{display:block;margin-bottom:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:rgba(251,250,247,.46)}
.copy-btn{
  display:inline-block;
  max-width:100%;
  padding:9px 12px;
  background:rgba(251,250,247,.05);
  border:1px dashed rgba(251,250,247,.3);
  color:var(--sheet);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.03em;
  text-align:left;
  word-break:break-all;
  cursor:pointer;
  transition:border-color var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease),background-color var(--dur-fast) var(--ease);
}
.copy-btn:hover{border-color:var(--amber);color:var(--amber)}
.copy-btn[data-copied]{border-style:solid;border-color:var(--cyan-pale);background:rgba(127,169,170,.14);color:var(--cyan-pale)}
.footer-contact__note{margin-top:14px;font-size:12px;line-height:1.7;color:rgba(251,250,247,.5)}
.footer-address{
  margin-top:14px;
  padding-left:12px;
  border-left:2px solid var(--cyan-pale);
  font-size:13px;
  line-height:1.75;
  color:rgba(251,250,247,.72);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:12px 24px;
  padding:22px 0 30px;
  border-top:1px solid rgba(251,250,247,.14);
  font-size:12px;
  color:rgba(251,250,247,.52);
}
.footer-legal__line{max-width:78ch}
.footer-legal__year{font-family:var(--font-mono);letter-spacing:.08em}

/* 返回顶部 */
.back-to-top{
  position:fixed;
  right:24px;
  bottom:calc(24px + env(safe-area-inset-bottom,0px));
  z-index:90;
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:12px 16px;
  background:var(--sheet);
  border:1px solid var(--rule);
  color:var(--ink);
  font-size:12px;
  font-weight:700;
  letter-spacing:.1em;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  box-shadow:var(--shadow-lift);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),
             visibility var(--dur) linear,color var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease);
}
.back-to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.back-to-top:hover{border-color:var(--vermilion);color:var(--vermilion)}
.back-to-top__arrow{font-family:var(--font-mono);font-size:13px;line-height:1}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1100px){
  .brand__note{display:none}
}

@media (max-width:1024px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;
    left:0;right:0;top:100%;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-left:0;
    padding:8px 32px 20px;
    background:var(--mineral);
    border-top:1px solid rgba(251,250,247,.14);
    box-shadow:0 34px 54px -38px rgba(22,32,31,.95);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) linear;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:none}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__list a{
    display:block;
    padding:15px 4px 15px 18px;
    border-bottom:1px solid rgba(251,250,247,.12);
    color:var(--sheet);
    font-size:15px;
  }
  .site-nav__list a::after{
    left:0;right:auto;
    top:50%;bottom:auto;
    width:9px;height:2px;
    transform:translateY(-50%) scaleX(0);
  }
  .site-nav__list a:hover::after,
  .site-nav__list a[aria-current="page"]::after{transform:translateY(-50%) scaleX(1)}
  .site-header[data-scrolled] .site-nav__list a::after{background:var(--amber)}
  .btn--cta{margin:18px 0 0;width:100%}
  .footer-grid{grid-template-columns:1fr 1fr;gap:40px 32px;padding:52px 0 36px}
}

@media (max-width:768px){
  .wrap{width:min(1240px,100% - 32px)}
  .site-nav{padding:8px 16px 20px}
}

@media (max-width:640px){
  :root{--header-rail-h:30px;--header-main-h:66px}
  .header-main__inner{gap:14px}
  .brand__name{font-size:20px}
  .brand__tagline{letter-spacing:.08em}
  .header-rail__meta{display:none}
  .header-rail__status{font-size:10px;letter-spacing:.04em}
  .footer-grid{grid-template-columns:1fr;gap:34px;padding:44px 0 32px}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .back-to-top{right:14px;bottom:calc(14px + env(safe-area-inset-bottom,0px));padding:10px 13px}
  .section-head__note{margin-left:0}
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .btn:hover,
  .plate--link:hover{transform:none}
}