/* ============================================================
   百利娱乐会馆 · 共享样式 /assets/site.css
   顺序：变量 → 重置 → 中文排版 → 容器与栅格 → 通用组件
        → 头部件 → 页脚 → 动效与可访问性 → 响应式
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  /* 深海蓝与鎏金体系 */
  --deep:#0B1F3A;
  --deep-2:#12305A;
  --deep-3:#081729;
  --gold:#C9A24B;
  --gold-soft:#E7CE8F;
  --orange:#E2762F;
  --cyan:#5FB8C4;
  --cyan-wash:#E3F1F3;
  --paper:#F5EFE3;
  --paper-2:#FBF7EE;
  --ink:#1A1A1A;
  --mute:#6B7480;

  --line-gold:rgba(201,162,75,.34);
  --line-deep:rgba(11,31,58,.16);
  --line-paper:rgba(231,206,143,.22);
  --on-dark:rgba(245,239,227,.68);
  --on-dark-soft:rgba(245,239,227,.52);

  /* 尺寸 */
  --shell:1280px;
  --gutter:20px;
  --rail-w:238px;
  --util-h:42px;

  /* 形状 */
  --radius:2px;
  --bw:2px;
  --shadow-hard:6px 6px 0 rgba(11,31,58,.18);
  --shadow-lift:10px 10px 0 rgba(11,31,58,.22);
  --shadow-dark:6px 6px 0 rgba(0,0,0,.35);
  --ease:cubic-bezier(.22,.61,.36,1);

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

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}
hr{border:0;border-top:1px solid var(--line-deep);margin:2rem 0}
::selection{background:var(--gold);color:var(--deep)}

/* ---------- 3. 中文排版 ---------- */
h1,h2,h3,h4,h5,h6{
  margin:0 0 .6em;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.16;
  letter-spacing:-.02em;
  color:var(--deep);
  text-wrap:balance;
}
h1{font-size:clamp(1.9rem,4.6vw,3.1rem)}
h2{font-size:clamp(1.55rem,3.4vw,2.35rem)}
h3{font-size:clamp(1.2rem,2.2vw,1.5rem)}
p{margin:0 0 1em}
a{color:inherit}
strong{font-weight:700}
.t-display{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(2.4rem,7.2vw,5.2rem);
  line-height:.98;
  letter-spacing:-.03em;
  color:var(--deep);
}
.t-display--paper{color:var(--paper)}
.eyebrow{
  display:inline-flex;align-items:center;gap:.6rem;
  font-family:var(--font-mono);font-size:.72rem;font-weight:600;
  letter-spacing:.24em;text-transform:uppercase;color:var(--gold);
  margin:0 0 14px;
}
.eyebrow::before{content:"";width:28px;height:2px;background:var(--gold);flex:none}
.vnote{
  writing-mode:vertical-rl;text-orientation:mixed;
  font-size:.72rem;letter-spacing:.34em;color:rgba(231,206,143,.5);
  margin:0;
}
.num{font-family:var(--font-mono);font-weight:600;color:var(--gold);letter-spacing:.02em;font-variant-numeric:tabular-nums}
.num--lg{font-size:1.5em;line-height:1}
#main-content{display:block}
[data-section]{scroll-margin-top:88px}

/* ---------- 4. 容器与栅格 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding:clamp(46px,7vw,104px) 0}
.section--paper{background:var(--paper);color:var(--ink)}
.section--paper-2{background:var(--paper-2)}
.section--dark{background:var(--deep);color:var(--paper)}
.section--dark h1,.section--dark h2,.section--dark h3,.section--dark .t-display{color:var(--paper)}
.section--deep2{background:var(--deep-2);color:var(--paper)}
.section--deep2 h1,.section--deep2 h2,.section--deep2 h3{color:var(--paper)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px 28px;padding-bottom:16px;margin-bottom:clamp(22px,3.4vw,44px);
  border-bottom:2px solid var(--line-deep);
}
.section--dark .section__head,.section--deep2 .section__head{border-bottom-color:var(--line-gold)}
.section__index{
  font-family:var(--font-mono);font-size:.74rem;font-weight:600;
  letter-spacing:.22em;text-transform:uppercase;color:var(--gold);margin:0;
}
.section__title{
  font-family:var(--font-display);font-size:clamp(1.6rem,4vw,2.8rem);
  font-weight:800;letter-spacing:-.02em;line-height:1.1;margin:0;
}
.section__lead{max-width:64ch;margin:0;color:var(--mute);font-size:.98rem}
.section--dark .section__lead,.section--deep2 .section__lead{color:var(--on-dark)}

.grid{display:grid;gap:18px}
.grid--2{grid-template-columns:1fr}
.grid--3{grid-template-columns:1fr}
.grid--4{grid-template-columns:1fr}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-3{grid-column:span 12}
.col-4{grid-column:span 12}
.col-5{grid-column:span 12}
.col-6{grid-column:span 12}
.col-7{grid-column:span 12}
.col-8{grid-column:span 12}
.col-9{grid-column:span 12}
.col-12{grid-column:span 12}

/* ---------- 5. 通用组件 ---------- */
.btn{
  --btn-bg:var(--gold);--btn-fg:#10233F;--btn-bd:var(--deep);--btn-sd:var(--deep);
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:.78rem 1.35rem;border:2px solid var(--btn-bd);border-radius:var(--radius);
  background:var(--btn-bg);color:var(--btn-fg);
  font-family:var(--font-body);font-size:.95rem;font-weight:700;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  box-shadow:4px 4px 0 var(--btn-sd);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease);
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--btn-sd)}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--btn-sd)}
.btn--gold{--btn-bg:var(--gold);--btn-fg:#10233F;--btn-bd:var(--deep);--btn-sd:var(--deep)}
.btn--dark{--btn-bg:var(--deep);--btn-fg:var(--gold-soft);--btn-bd:var(--gold);--btn-sd:rgba(0,0,0,.4)}
.btn--cyan{--btn-bg:var(--cyan);--btn-fg:#082033;--btn-bd:var(--deep);--btn-sd:var(--deep)}
.btn--ghost{--btn-bg:transparent;--btn-fg:var(--gold-soft);--btn-bd:var(--gold);
  box-shadow:none;border-width:2px}
.btn--ghost:hover{background:rgba(201,162,75,.16);color:var(--gold);transform:none;box-shadow:none}
.btn--sm{padding:.52rem .95rem;font-size:.84rem}

.tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:.28rem .62rem;border:1px solid currentColor;border-radius:var(--radius);
  font-size:.75rem;font-weight:600;letter-spacing:.08em;line-height:1.5;white-space:nowrap;
}
.tag--gold{color:var(--gold);background:rgba(201,162,75,.12)}
.tag--cyan{color:#1B6773;background:var(--cyan-wash);border-color:#9FD3DA}
.tag--orange{color:#A8450E;background:#FBE8DB;border-color:#F0B38C}
.tag--paper{color:var(--gold-soft);background:transparent;border-color:var(--line-gold)}

.card{
  background:#FFFDF8;border:2px solid var(--deep);border-radius:var(--radius);
  box-shadow:var(--shadow-hard);padding:clamp(18px,2.4vw,26px);
}
.card--dark{background:var(--deep-2);border-color:var(--line-gold);color:var(--paper);box-shadow:var(--shadow-dark)}
.card--dark h2,.card--dark h3{color:var(--paper)}
.card--paper{background:var(--paper)}
.card__title{margin:0 0 .5em;font-size:1.15rem}
.card__meta{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em;color:var(--gold);text-transform:uppercase;margin:0 0 .6em}

.legend{display:flex;flex-wrap:wrap;gap:10px 22px;list-style:none;margin:0;padding:0;font-size:.82rem;color:var(--mute)}
.legend__item{display:inline-flex;align-items:center;gap:.5rem}
.legend__dot{width:10px;height:10px;background:var(--gold);flex:none}
.legend__dot--cyan{background:var(--cyan)}
.legend__dot--orange{background:var(--orange)}
.legend__dot--paper{background:var(--paper);border:1px solid var(--gold)}

.index-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line-deep)}
.index-list__item{
  display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:baseline;
  padding:13px 4px;border-bottom:1px solid var(--line-deep);
  color:inherit;text-decoration:none;
  transition:background-color .18s var(--ease),padding-left .18s var(--ease);
}
.index-list__item:hover{background:rgba(201,162,75,.14);padding-left:14px}
.index-list__lead{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.1em;color:var(--gold)}
.index-list__tail{font-size:.8rem;color:var(--mute)}

.prose{max-width:74ch;font-size:1.02rem;line-height:1.85;color:#24272B}
.prose h2{font-size:1.5rem;margin:2.2em 0 .8em}
.prose h3{font-size:1.18rem;margin:1.8em 0 .6em}
.prose p{margin:0 0 1.15em}
.prose ul,.prose ol{margin:0 0 1.3em;padding-left:1.3em}
.prose li{margin:0 0 .5em}
.prose a{color:#14586B;text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--orange)}
.prose strong{color:var(--deep)}
.prose blockquote{
  margin:1.5rem 0;padding:1rem 1.25rem;border-left:4px solid var(--gold);
  background:#FFF8EA;color:#2C2A25;
}
.prose blockquote p:last-child{margin-bottom:0}
.prose code{font-family:var(--font-mono);font-size:.9em;background:rgba(11,31,58,.07);padding:.12em .38em;border-radius:var(--radius)}
.prose--dark{color:rgba(245,239,227,.86)}
.prose--dark h2,.prose--dark h3,.prose--dark strong{color:var(--gold-soft)}
.prose--dark a{color:var(--cyan)}
.prose--dark blockquote{background:rgba(201,162,75,.1);border-left-color:var(--gold);color:var(--paper)}

.breadcrumb{padding:16px 0;border-bottom:1px solid var(--line-deep)}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:.4rem;list-style:none;margin:0;padding:0;font-size:.8rem;color:var(--mute)}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li+li::before{content:"／";margin:0 .5rem 0 .1rem;color:var(--gold)}
.breadcrumb a{color:var(--deep-2);text-decoration:none;border-bottom:1px solid rgba(18,48,90,.3)}
.breadcrumb a:hover{color:var(--orange);border-bottom-color:var(--orange)}

/* 图片容器（页面阶段放置图片占位） */
.media{
  position:relative;display:block;overflow:hidden;
  background:linear-gradient(140deg,var(--deep) 0%,var(--deep-2) 58%,#1B4272 100%);
  border:2px solid var(--deep);border-radius:var(--radius);
}
.media > img,.media > svg,.media > picture > img{
  width:100%;height:100%;object-fit:cover;
  filter:saturate(.94) contrast(1.05) brightness(.98);
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--3x4{aspect-ratio:3/4}
.media--1x1{aspect-ratio:1/1}
.media--21x9{aspect-ratio:21/9}
.media--frame{border-color:var(--gold);box-shadow:8px 8px 0 rgba(11,31,58,.22)}
.media--tone::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(165deg,rgba(11,31,58,.46) 0%,rgba(11,31,58,.04) 52%,rgba(11,31,58,.52) 100%);
}
.media__caption{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:.5rem .8rem;background:rgba(11,31,58,.86);color:var(--gold-soft);
  font-size:.74rem;letter-spacing:.08em;
}
.media__badge{
  position:absolute;top:10px;left:10px;z-index:2;
  padding:.24rem .6rem;background:var(--gold);color:#10233F;
  font-family:var(--font-mono);font-size:.72rem;font-weight:700;letter-spacing:.1em;
}

/* ---------- 6. 头部 ---------- */
.skip-link{
  position:absolute;left:14px;top:-70px;z-index:300;
  padding:10px 18px;background:var(--gold);color:#0B1F3A;
  font-weight:700;text-decoration:none;border:2px solid var(--deep);border-radius:var(--radius);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

.site-header{position:sticky;top:0;z-index:100}

/* 移动端顶栏 */
.header-rail{
  position:relative;display:flex;align-items:center;justify-content:space-between;
  gap:14px;padding:11px 18px;background:var(--deep);border-bottom:2px solid var(--gold);
}
.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;color:var(--paper)}
.brand-mark{
  flex:none;display:grid;place-items:center;width:42px;height:42px;
  border:2px solid var(--gold);border-radius:var(--radius);
  background:linear-gradient(140deg,#16386A,#0B1F3A);
  color:var(--gold);font-family:var(--font-display);font-size:1.24rem;font-weight:800;
  box-shadow:3px 3px 0 rgba(0,0,0,.38);
}
.brand-text{display:flex;flex-direction:column;gap:2px}
.brand-name{font-family:var(--font-display);font-size:1.04rem;font-weight:800;letter-spacing:.05em;line-height:1.2}
.brand-sub{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.18em;color:var(--gold-soft);opacity:.72}

.nav-toggle{
  display:inline-flex;align-items:center;gap:10px;
  padding:10px 14px;background:transparent;border:2px solid var(--gold);border-radius:var(--radius);
  color:var(--gold-soft);font-size:.82rem;font-weight:700;letter-spacing:.14em;cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(201,162,75,.16);color:var(--gold)}
.nav-toggle-bars{position:relative;display:inline-block;width:18px;height:12px}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;background:currentColor;
  transition:transform .22s var(--ease),top .22s var(--ease);
}
.nav-toggle-bars::before{top:2px}
.nav-toggle-bars::after{top:8px}
.site-header[data-open] .nav-toggle-bars::before{top:5px;transform:rotate(45deg)}
.site-header[data-open] .nav-toggle-bars::after{top:5px;transform:rotate(-45deg)}

/* 遮罩 */
.nav-scrim{
  position:fixed;inset:0;z-index:110;background:rgba(5,14,27,.64);
  opacity:0;pointer-events:none;transition:opacity .26s var(--ease);
}
.site-header[data-open] .nav-scrim{opacity:1;pointer-events:auto}

/* 移动端抽屉 */
.rail-nav{
  position:fixed;top:0;left:0;bottom:0;z-index:120;
  display:flex;flex-direction:column;
  width:min(86vw,352px);padding:20px 20px 26px;
  background:linear-gradient(180deg,var(--deep) 0%,var(--deep-3) 100%);
  border-right:2px solid var(--gold);box-shadow:14px 0 40px rgba(4,12,24,.5);
  transform:translateX(-103%);transition:transform .3s var(--ease);
  overflow-y:auto;overscroll-behavior:contain;
}
.site-header[data-open] .rail-nav{transform:translateX(0)}
.rail-nav__head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-bottom:13px;margin-bottom:10px;border-bottom:2px solid var(--gold);
}
.rail-nav__kicker{
  margin:0;font-family:var(--font-mono);font-size:.68rem;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--gold-soft);
}
.rail-nav__code{color:var(--mute)}
.rail-close{
  width:34px;height:34px;flex:none;display:grid;place-items:center;
  background:transparent;border:1px solid var(--line-gold);border-radius:var(--radius);
  color:var(--gold-soft);font-size:1.1rem;line-height:1;cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.rail-close:hover{background:rgba(201,162,75,.18);color:var(--gold)}

.nav-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.nav-item{border-bottom:1px solid rgba(231,206,143,.13)}
.nav-link{
  display:flex;align-items:center;gap:14px;padding:13px 8px;
  color:var(--paper);text-decoration:none;font-size:1rem;font-weight:600;
  transition:color .18s var(--ease),background-color .18s var(--ease),padding-left .18s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--gold-soft);background:rgba(201,162,75,.12);padding-left:16px}
.nav-index{flex:none;min-width:1.9em;font-family:var(--font-mono);font-size:.7rem;font-weight:600;letter-spacing:.06em;color:var(--gold)}
.nav-link[aria-current="page"]{
  color:var(--gold);padding-left:16px;
  background:linear-gradient(90deg,rgba(201,162,75,.26),rgba(201,162,75,0));
  box-shadow:inset 3px 0 0 var(--gold);
}
.nav-link[aria-current="page"] .nav-index{color:var(--gold-soft)}

.rail-foot{
  margin-top:auto;padding-top:18px;display:grid;gap:4px;
  border-top:1px solid rgba(231,206,143,.16);
}
.rail-foot__label{margin:0;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.2em;text-transform:uppercase;color:var(--on-dark-soft)}
.rail-foot__value{margin:0;font-family:var(--font-mono);font-size:1.06rem;font-weight:600;letter-spacing:.04em;color:var(--gold)}
.rail-foot__meta{margin:0;font-size:.75rem;color:var(--on-dark);word-break:break-all}
.rail-foot__note{margin:6px 0 0;font-size:.72rem;color:var(--on-dark-soft)}
.rail-note{align-self:flex-end;margin-top:16px}

/* 顶栏快捷入口：移动端隐藏 */
.header-utility{display:none}
.utility-link{
  color:var(--gold-soft);text-decoration:none;font-size:.78rem;letter-spacing:.06em;
  padding-bottom:2px;border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.utility-link:hover{color:var(--gold);border-bottom-color:var(--gold)}
.utility-link--strong{color:var(--orange);border-bottom-color:rgba(226,118,47,.5)}
.utility-link--strong:hover{color:#F08A45;border-bottom-color:#F08A45}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--deep);color:var(--paper);
  border-top:4px solid var(--gold);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(90deg,rgba(201,162,75,.07) 1px,transparent 1px),
    linear-gradient(180deg,rgba(201,162,75,.07) 1px,transparent 1px);
  background-size:64px 64px;
}
.site-footer .shell{position:relative;z-index:1}

.footer-coord{
  display:flex;align-items:center;gap:14px;padding:15px 0;
  border-bottom:1px solid var(--line-paper);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;
  color:rgba(231,206,143,.72);
}
.footer-coord__dot{width:9px;height:9px;flex:none;background:var(--gold);box-shadow:0 0 0 3px rgba(201,162,75,.22)}
.footer-coord__line{flex:1;min-width:20px;height:1px;background:var(--line-paper)}

.footer-top{display:grid;grid-template-columns:1fr;gap:36px;padding:clamp(34px,5vw,60px) 0 34px}
.footer-brand{display:flex;flex-direction:column;gap:14px}
.brand--footer .brand-name{font-size:1.14rem}
.footer-brand__line{margin:0;font-family:var(--font-display);font-size:1.04rem;font-weight:700;color:var(--gold-soft);letter-spacing:.02em}
.footer-brand__note{margin:0;max-width:34ch;font-size:.85rem;line-height:1.75;color:var(--on-dark)}
.footer-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:2px}

.footer-col__title{
  margin:0 0 14px;padding-bottom:10px;
  font-family:var(--font-body);font-size:.75rem;font-weight:700;
  letter-spacing:.22em;text-transform:uppercase;color:var(--gold);
  border-bottom:1px solid var(--line-paper);
}
.footer-col__list{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.footer-col__list a{
  display:inline-flex;align-items:center;gap:.55rem;
  color:rgba(245,239,227,.82);text-decoration:none;font-size:.88rem;
  transition:color .18s var(--ease);
}
.footer-col__list a::before{content:"";width:6px;height:1px;flex:none;background:var(--line-gold);transition:width .18s var(--ease),background-color .18s var(--ease)}
.footer-col__list a:hover{color:var(--gold)}
.footer-col__list a:hover::before{width:15px;background:var(--gold)}

.footer-contact{
  display:grid;grid-template-columns:1fr;gap:16px;
  padding:24px 0;border-top:1px solid var(--line-paper);border-bottom:1px solid var(--line-paper);
}
.footer-contact__item{display:grid;gap:5px}
.footer-contact__label{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.2em;text-transform:uppercase;color:var(--gold)}
.footer-contact__value{font-size:.92rem;color:var(--paper);word-break:break-word}
.footer-contact__note{margin:14px 0 0;max-width:78ch;font-size:.78rem;line-height:1.75;color:var(--on-dark-soft)}

.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 26px;padding:18px 0 30px;
}
.footer-legal__copy{margin:0;font-size:.78rem;color:var(--on-dark-soft)}
.footer-legal__links{list-style:none;display:flex;flex-wrap:wrap;gap:8px 22px;margin:0;padding:0;font-size:.78rem}
.footer-legal__links a{
  color:rgba(231,206,143,.8);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-legal__links a:hover{color:var(--gold);border-bottom-color:var(--gold)}

/* ---------- 8. 滚动交互组件 ---------- */
.read-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:200;
  background:rgba(11,31,58,.16);pointer-events:none;
}
.read-progress__bar{
  display:block;width:0;height:100%;
  background:linear-gradient(90deg,var(--gold) 0%,var(--orange) 100%);
  transition:width .12s linear;
}
.to-top{
  position:fixed;right:18px;bottom:18px;z-index:130;
  width:46px;height:46px;display:grid;place-items:center;
  background:var(--deep);border:2px solid var(--gold);border-radius:var(--radius);
  color:var(--gold);font-size:1.1rem;line-height:1;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease),background-color .18s var(--ease);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--deep-2)}

[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .32s ease-out,transform .32s ease-out}
[data-reveal].is-visible{opacity:1;transform:none}
[data-index-for]{transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease)}
[data-index-for].is-current{color:var(--gold);border-color:var(--gold)}

/* ---------- 9. 可访问性 ---------- */
:focus-visible{outline:3px solid var(--orange);outline-offset:3px;border-radius:var(--radius)}
.skip-link:focus-visible{outline-color:var(--deep)}

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

/* ---------- 10. 响应式 ---------- */
@media (max-width:1023px){
  body.nav-open{overflow:hidden}
}

@media (min-width:600px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (min-width:760px){
  :root{--gutter:32px}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
  .col-9{grid-column:span 9}
  .col-12{grid-column:span 12}
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr));gap:38px 30px}
}

@media (min-width:1024px){
  :root{--gutter:34px}
  body{padding-left:var(--rail-w);padding-top:var(--util-h)}

  .site-header{position:static;background:none}
  .nav-scrim{display:none}
  .nav-toggle{display:none}
  .rail-close{display:none}

  .header-utility{
    display:block;position:fixed;top:0;left:0;right:0;height:var(--util-h);z-index:110;
    background:var(--deep-3);border-bottom:1px solid var(--line-gold);
  }
  .header-utility__inner{display:flex;align-items:center;justify-content:space-between;gap:28px;height:100%}
  .header-utility__tagline{
    margin:0;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;
    text-transform:uppercase;color:rgba(231,206,143,.66);
  }
  .header-utility__nav{display:flex;align-items:center;gap:26px}

  .header-rail{
    position:fixed;top:var(--util-h);left:0;bottom:0;z-index:105;
    width:var(--rail-w);padding:26px 22px 24px;
    display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;gap:0;
    background:linear-gradient(180deg,var(--deep) 0%,var(--deep-3) 100%);
    border-bottom:none;border-right:2px solid var(--line-gold);
    overflow-y:auto;overscroll-behavior:contain;
  }
  .brand-mark{width:46px;height:46px;font-size:1.34rem}
  .brand-name{font-size:1.1rem}

  .rail-nav{
    position:static;width:auto;transform:none;
    padding:0;margin-top:24px;flex:1 1 auto;
    background:none;border-right:none;box-shadow:none;overflow:visible;
    display:flex;flex-direction:column;
  }
  .nav-link{font-size:.95rem;padding:11px 8px}
  .nav-link:hover,.nav-link:focus-visible{padding-left:14px}
  .nav-link[aria-current="page"]{padding-left:14px}
  .rail-foot{margin-top:auto}

  .to-top{right:28px;bottom:28px}
}

@media (min-width:1140px){
  .grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
  .footer-top{grid-template-columns:1.5fr 1fr 1fr 1fr;gap:44px}
  .footer-contact{grid-template-columns:1fr 1fr 1.6fr}
  .footer-contact__item--wide{justify-self:start}
}