/* ==========================================================================
   MGM 美高梅 · 档案剧院 Site Kit
   1 令牌 / 2 重置 / 3 基础排版 / 4 通用构件 / 5 头部 / 6 页脚 / 7 页面组件
   ========================================================================== */

/* ---------- 1. 令牌 ---------- */
:root{
  --mgm-ink-green:#123B32;
  --mgm-green-deep:#0B2620;
  --mgm-gold:#C9A45C;
  --mgm-gold-soft:#E2CFA5;
  --mgm-ivory:#F4EFE4;
  --mgm-charcoal:#1C1F1C;
  --mgm-burgundy:#6E1F2B;
  --mgm-blue-green:#2F8C7A;
  --mgm-graphite:#4A514B;
  --mgm-paper:#EBE3D2;

  --font-display:'Noto Serif SC','Source Han Serif SC','Songti SC',serif;
  --font-body:'Noto Sans SC','Source Han Sans SC','PingFang SC',sans-serif;
  --font-mono:'IBM Plex Mono','JetBrains Mono','SFMono-Regular',monospace;

  --bar-h:68px;
  --rail-w:258px;
  --rail-pad:clamp(18px,1.8vw,26px);
  --page-pad:clamp(18px,4vw,56px);
  --max-w:1180px;

  --line-ink:1px solid rgba(28,31,28,.16);
  --line-gold:1px solid rgba(201,164,92,.55);
  --shadow-card:0 1px 0 rgba(28,31,28,.05),0 14px 30px -24px rgba(11,38,32,.6);
}

/* ---------- 2. 重置 ---------- */
*,*::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}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
[hidden]{display:none !important}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:clamp(1rem,1.05vw,1.125rem);
  line-height:1.85;
  color:var(--mgm-charcoal);
  background-color:var(--mgm-ivory);
  background-image:linear-gradient(180deg,rgba(235,227,210,.55) 0,rgba(244,239,228,0) 420px);
  padding-top:var(--bar-h);
  padding-left:var(--rail-w);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:700;
  letter-spacing:-.02em;
  line-height:1.2;
  color:var(--mgm-ink-green);
}
p{max-width:72ch}
#main-content{display:block;scroll-margin-top:calc(var(--bar-h) + 14px)}
#main-content:focus{outline:none}
::selection{background:rgba(201,164,92,.4);color:var(--mgm-green-deep)}
:focus-visible{outline:2px solid var(--mgm-blue-green);outline-offset:3px}
.section--dark :focus-visible,
.site-footer :focus-visible,
.frame-rail :focus-visible{outline-color:var(--mgm-gold-soft)}

.mono{font-family:var(--font-mono);letter-spacing:.04em}
.container{width:min(var(--max-w),100% - 2 * var(--page-pad));margin-inline:auto}
.container--wide{width:min(1360px,100% - 2 * var(--page-pad));margin-inline:auto}
.container--narrow{width:min(760px,100% - 2 * var(--page-pad));margin-inline:auto}

/* ---------- 4. 通用构件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.72rem 1.15rem;
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.12em;
  text-decoration:none;border:1px solid transparent;border-radius:2px;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn:active{transform:translateY(1px)}
.btn--solid{background:var(--mgm-ink-green);border-color:var(--mgm-ink-green);color:var(--mgm-ivory)}
.btn--solid:hover{background:var(--mgm-gold);border-color:var(--mgm-gold);color:var(--mgm-green-deep)}
.btn--gold{background:var(--mgm-gold);border-color:var(--mgm-gold);color:var(--mgm-green-deep)}
.btn--gold:hover{background:var(--mgm-gold-soft);border-color:var(--mgm-gold-soft)}
.btn--ghost{background:transparent;border-color:rgba(18,59,50,.32);color:var(--mgm-ink-green)}
.btn--ghost:hover{border-color:var(--mgm-gold);background:rgba(201,164,92,.14)}
.btn--ghost-light{background:transparent;border-color:rgba(226,207,165,.4);color:var(--mgm-gold-soft)}
.btn--ghost-light:hover{border-color:var(--mgm-gold);color:var(--mgm-ivory);background:rgba(201,164,92,.16)}

.eyebrow{
  display:inline-flex;align-items:center;gap:12px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.26em;
  color:var(--mgm-gold);
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.85}
.eyebrow--burgundy{color:var(--mgm-burgundy)}
.section--dark .eyebrow{color:var(--mgm-gold-soft)}

.display{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(2.8rem,7vw,7.5rem);
  line-height:.98;letter-spacing:-.02em;
  color:var(--mgm-ink-green);
}
.display--lg{font-size:clamp(2.2rem,4.6vw,4rem);line-height:1.1}
.display--md{font-size:clamp(1.7rem,3vw,2.6rem);line-height:1.22}
.section--dark .display{color:var(--mgm-ivory)}

.lede{font-size:clamp(1.02rem,1.3vw,1.26rem);line-height:1.85;color:var(--mgm-graphite);max-width:52ch}
.section--dark .lede{color:rgba(244,239,228,.78)}

.prose{max-width:68ch}
.prose p + p{margin-top:1.05em}
.prose h2,.prose h3{margin-top:1.9em;margin-bottom:.55em}
.prose ul{margin-top:.8em}
.prose li{position:relative;padding-left:1.15em;margin-top:.45em}
.prose li::before{content:"";position:absolute;left:0;top:.85em;width:8px;height:1px;background:var(--mgm-gold)}

.rule{border:0;height:1px;margin-block:clamp(24px,3vw,40px);background:linear-gradient(90deg,var(--mgm-gold),rgba(201,164,92,.08))}

.tag{
  display:inline-flex;align-items:center;gap:7px;
  padding:4px 10px;border:1px solid rgba(201,164,92,.6);border-radius:2px;
  background:rgba(201,164,92,.1);color:var(--mgm-ink-green);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.12em;
}
.tag--burgundy{border-color:rgba(110,31,43,.45);background:rgba(110,31,43,.07);color:var(--mgm-burgundy)}
.tag--live{border-color:rgba(47,140,122,.5);background:rgba(47,140,122,.1);color:#1F6D5E}
.tag--live::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--mgm-blue-green)}

.note{
  padding:12px 0 12px 16px;
  border-left:2px solid var(--mgm-gold);
  background:linear-gradient(90deg,rgba(201,164,92,.1),rgba(201,164,92,0));
  font-size:.92rem;color:var(--mgm-graphite);
}
.note__label{display:block;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.2em;color:var(--mgm-burgundy);margin-bottom:4px}

.link-arrow{
  display:inline-flex;align-items:center;gap:10px;
  padding-bottom:3px;border-bottom:1px solid rgba(201,164,92,.6);
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.12em;
  color:var(--mgm-ink-green);text-decoration:none;
  transition:gap .18s ease,color .18s ease,border-color .18s ease;
}
.link-arrow::after{content:"→";color:var(--mgm-gold)}
.link-arrow:hover{gap:16px;color:var(--mgm-burgundy);border-bottom-color:var(--mgm-burgundy)}

/* 跳转链接 */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:300;
  transform:translateY(-180%);
  padding:.7rem 1.1rem;border-radius:2px;
  background:var(--mgm-gold);color:var(--mgm-green-deep);
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.08em;text-decoration:none;
  transition:transform .2s ease;
}
.skip-link:focus,.skip-link:focus-visible{transform:none;outline:2px solid var(--mgm-blue-green);outline-offset:3px}

/* ---------- 5. 头部 ---------- */
.site-header{position:relative;z-index:70}

.frame-bar{
  position:fixed;top:0;left:0;right:0;height:var(--bar-h);z-index:70;
  display:flex;align-items:center;gap:clamp(12px,2vw,30px);
  padding:0 clamp(14px,2.2vw,28px);
  background:rgba(244,239,228,.97);
  border-bottom:1px solid rgba(28,31,28,.16);
  box-shadow:0 1px 0 rgba(201,164,92,.4),0 10px 24px -26px rgba(11,38,32,.9);
}

.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;flex:0 0 auto}
.brand__glyph{
  width:40px;height:40px;display:grid;place-items:center;
  background:var(--mgm-green-deep);color:var(--mgm-gold);
  border:1px solid rgba(201,164,92,.62);
  font-family:var(--font-display);font-size:1.06rem;line-height:1;
  box-shadow:inset 0 0 0 3px rgba(244,239,228,.07);
}
.brand__text{display:flex;flex-direction:column;gap:3px;line-height:1.1}
.brand__name{font-family:var(--font-display);font-size:1.02rem;letter-spacing:.06em;color:var(--mgm-ink-green)}
.brand__descriptor{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.18em;color:var(--mgm-graphite)}

.frame-bar__hint{
  display:flex;align-items:center;gap:10px;
  padding-left:clamp(14px,2vw,26px);
  border-left:1px solid rgba(28,31,28,.14);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;
  color:var(--mgm-graphite);max-width:44ch;line-height:1.5;
}
.frame-bar__dot{
  flex:0 0 auto;width:6px;height:6px;border-radius:50%;
  background:var(--mgm-blue-green);box-shadow:0 0 0 3px rgba(47,140,122,.18);
}

.frame-bar__actions{margin-left:auto;display:flex;align-items:center;gap:10px}

/* 复制芯片 */
.copy-chip{
  display:inline-flex;align-items:center;gap:9px;
  padding:7px 12px;border:1px solid rgba(28,31,28,.2);border-radius:2px;
  background:transparent;color:var(--mgm-charcoal);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;
  cursor:pointer;
  transition:border-color .18s ease,color .18s ease,background-color .18s ease;
}
.copy-chip:hover{border-color:var(--mgm-gold);background:rgba(201,164,92,.1);color:var(--mgm-ink-green)}
.copy-chip__key{color:var(--mgm-graphite);letter-spacing:.16em}
.copy-chip__value{letter-spacing:.04em}
.copy-chip__state{font-size:.68rem;letter-spacing:.1em;color:var(--mgm-blue-green)}
.copy-chip__state:empty{display:none}
.copy-chip[data-copy-state="done"]{border-color:var(--mgm-blue-green);color:var(--mgm-ink-green)}
.copy-chip--rail{
  width:100%;justify-content:flex-start;gap:8px;
  margin-top:14px;padding:9px 11px;font-size:.68rem;
  border-color:rgba(226,207,165,.32);color:rgba(244,239,228,.9);
}
.copy-chip--rail .copy-chip__key{color:var(--mgm-gold-soft);letter-spacing:.14em}
.copy-chip--rail .copy-chip__value{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:left}
.copy-chip--rail:hover{background:rgba(201,164,92,.16);border-color:var(--mgm-gold);color:#fff}
.copy-chip--rail[data-copy-state="done"]{border-color:var(--mgm-blue-green);color:var(--mgm-gold-soft)}

/* 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:8px 11px;border:1px solid rgba(28,31,28,.2);border-radius:2px;
  background:transparent;color:var(--mgm-ink-green);cursor:pointer;
  transition:border-color .18s ease,background-color .18s ease;
}
.nav-toggle:hover{border-color:var(--mgm-gold);background:rgba(201,164,92,.12)}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars span{display:block;height:1.5px;background:var(--mgm-ink-green);transition:transform .22s ease,opacity .22s ease}
.nav-toggle__label{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}

/* 滚动进度 */
.scroll-meter{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(28,31,28,.07);overflow:hidden;pointer-events:none;
}
.scroll-meter__bar{
  display:block;width:100%;height:100%;
  background:linear-gradient(90deg,var(--mgm-gold),var(--mgm-blue-green));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .12s linear;
}

/* 左侧栏目轨道 */
.frame-rail{
  position:fixed;top:var(--bar-h);left:0;bottom:0;width:var(--rail-w);z-index:60;
  display:flex;
  padding:clamp(24px,3.4vh,38px) 20px 24px var(--rail-pad);
  background:linear-gradient(168deg,#123B32 0%,#0B2620 58%,#0B2620 100%);
  border-right:1px solid rgba(201,164,92,.42);
  box-shadow:inset -1px 0 0 rgba(0,0,0,.25);
  color:var(--mgm-ivory);
  overflow-y:auto;overscroll-behavior:contain;
}
.site-nav{display:flex;flex-direction:column;width:100%;min-height:100%}
.site-nav__label{
  padding-bottom:12px;border-bottom:1px solid rgba(226,207,165,.24);
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.26em;
  color:rgba(226,207,165,.72);
}
.site-nav__list{margin-top:18px;display:flex;flex-direction:column}
.site-nav__item{position:relative}
.site-nav__link{
  position:relative;display:flex;align-items:baseline;gap:13px;
  padding:13px 6px 13px 0;
  border-bottom:1px solid rgba(226,207,165,.13);
  color:rgba(244,239,228,.8);text-decoration:none;
  font-size:.95rem;letter-spacing:.06em;line-height:1.5;
  transition:color .2s ease,padding-left .22s ease,background-color .2s ease;
}
.site-nav__num{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;
  color:rgba(226,207,165,.5);transition:color .2s ease;
}
.site-nav__text{flex:1;min-width:0}
.site-nav__link:hover{color:#fff;padding-left:8px;background:rgba(226,207,165,.06)}
.site-nav__link:hover .site-nav__num{color:var(--mgm-gold)}
.site-nav__link[aria-current="page"]{color:var(--mgm-gold-soft);background:rgba(201,164,92,.12)}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--mgm-gold)}
.site-nav__link[aria-current="page"]::before{
  content:"";position:absolute;left:calc(-1 * var(--rail-pad));top:8px;bottom:8px;width:3px;
  background:var(--mgm-gold);
}
.site-nav__foot{
  margin-top:auto;padding-top:22px;border-top:1px solid rgba(226,207,165,.24);
  display:flex;flex-direction:column;gap:8px;
}
.site-nav__meta{font-family:var(--font-mono);font-size:.66rem;line-height:1.7;letter-spacing:.07em;color:rgba(226,207,165,.62);max-width:none}
.site-nav__meta--quiet{color:rgba(226,207,165,.44)}
.site-nav__cta{display:none;width:100%;margin-top:10px}

.nav-scrim{display:none}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(56px,8vw,110px);
  background:var(--mgm-green-deep);color:var(--mgm-ivory);
}
.site-footer::before{
  content:"";display:block;height:16px;
  background:repeating-linear-gradient(180deg,rgba(201,164,92,.5) 0 1px,rgba(201,164,92,0) 1px 5px);
}
.site-footer::after{
  content:"";position:absolute;left:-10%;right:-10%;bottom:-45%;height:70%;
  background:radial-gradient(ellipse at 50% 100%,rgba(201,164,92,.16),rgba(201,164,92,0) 70%);
  pointer-events:none;
}
.footer-inner{
  position:relative;z-index:1;
  width:min(1340px,100% - 2 * var(--page-pad));margin-inline:auto;
  padding:clamp(38px,5vw,68px) 0 clamp(22px,3vw,34px);
}
.footer-top{
  display:grid;grid-template-columns:minmax(280px,1.15fr) minmax(0,1.5fr);
  gap:clamp(28px,4vw,72px);
  padding-bottom:clamp(26px,3vw,44px);
  border-bottom:1px solid rgba(226,207,165,.22);
}
.footer-brand__name{
  font-family:var(--font-display);font-size:clamp(1.6rem,2.6vw,2.3rem);
  letter-spacing:.05em;line-height:1.15;color:var(--mgm-ivory);
}
.footer-brand__descriptor{
  margin-top:9px;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.22em;
  color:var(--mgm-gold);
}
.footer-summary{
  margin-top:18px;max-width:42ch;
  font-size:.95rem;line-height:1.9;color:rgba(244,239,228,.72);
}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,40px);align-items:start}
.footer-col__title{
  padding-bottom:10px;margin-bottom:12px;
  border-bottom:1px solid rgba(226,207,165,.26);
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.24em;
  color:var(--mgm-gold);
}
.footer-col__list{display:flex;flex-direction:column;gap:9px}
.footer-col__link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.92rem;color:rgba(244,239,228,.82);text-decoration:none;
  transition:color .18s ease,gap .18s ease;
}
.footer-col__link::before{
  content:"";width:12px;height:1px;background:rgba(201,164,92,.6);
  transition:width .18s ease,background-color .18s ease;
}
.footer-col__link:hover{color:#fff;gap:11px}
.footer-col__link:hover::before{width:20px;background:var(--mgm-gold)}

.footer-contact{
  margin-top:clamp(26px,3vw,44px);
  padding:clamp(20px,2.4vw,30px);
  border:1px solid rgba(226,207,165,.22);
  background:linear-gradient(180deg,rgba(244,239,228,.055),rgba(244,239,228,.015));
}
.footer-contact__label{
  margin-bottom:16px;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.26em;color:var(--mgm-gold);
}
.contact-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(14px,2vw,28px)}
.contact-item{
  display:flex;flex-direction:column;gap:6px;
  padding-top:12px;border-top:1px solid rgba(226,207,165,.2);
}
.contact-item__key{font-family:var(--font-mono);font-size:.64rem;letter-spacing:.2em;color:rgba(226,207,165,.7)}
.contact-item__row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.contact-item__value{font-size:.95rem;line-height:1.6;color:var(--mgm-ivory);word-break:break-word}
.copy-btn{
  padding:3px 8px;border:1px solid rgba(226,207,165,.34);border-radius:2px;
  background:transparent;color:rgba(226,207,165,.86);cursor:pointer;
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.14em;
  transition:border-color .18s ease,color .18s ease,background-color .18s ease;
}
.copy-btn:hover{border-color:var(--mgm-gold);color:var(--mgm-gold-soft);background:rgba(201,164,92,.14)}
.copy-btn[data-copy-state="done"]{border-color:var(--mgm-blue-green);color:var(--mgm-blue-green)}
.footer-contact__note{
  margin-top:18px;padding-left:12px;border-left:2px solid rgba(201,164,92,.55);
  font-size:.82rem;line-height:1.8;color:rgba(244,239,228,.62);max-width:66ch;
}
.footer-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}

.footer-legal{
  margin-top:clamp(24px,3vw,36px);padding-top:18px;
  border-top:1px solid rgba(226,207,165,.2);
  display:flex;flex-wrap:wrap;align-items:center;gap:12px 26px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;color:rgba(244,239,228,.6);
}
.footer-legal__copy{max-width:none}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:12px 20px;margin-left:auto}
.legal-link{
  color:rgba(244,239,228,.74);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.legal-link:hover{color:var(--mgm-gold-soft);border-bottom-color:rgba(201,164,92,.7)}
.footer-legal__icp{letter-spacing:.08em}
.footer-note{
  margin-top:12px;max-width:none;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.04em;line-height:1.8;
  color:rgba(244,239,228,.44);
}

/* ---------- 7. 页面通用组件 ---------- */
.breadcrumbs{padding-block:16px}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;color:var(--mgm-graphite)}
.breadcrumbs__list li{display:flex;align-items:center;gap:8px}
.breadcrumbs__list li + li::before{content:"/";color:var(--mgm-gold)}
.breadcrumbs__link{text-decoration:none;border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease}
.breadcrumbs__link:hover{color:var(--mgm-ink-green);border-bottom-color:var(--mgm-gold)}
.breadcrumbs [aria-current="page"]{color:var(--mgm-ink-green)}

.section{padding-block:clamp(44px,6vw,96px)}
.section--tight{padding-block:clamp(26px,3.5vw,54px)}
.section--paper{background:var(--mgm-paper)}
.section--edge{background:linear-gradient(180deg,rgba(235,227,210,.95),rgba(235,227,210,0))}
.section--dark{background:var(--mgm-ink-green);color:var(--mgm-ivory)}
.section--dark h2,.section--dark h3,.section--dark h4{color:var(--mgm-ivory)}
.section--dark .prose,.section--dark p{color:rgba(244,239,228,.82)}

.grid{display:grid;gap:clamp(20px,3vw,44px)}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.grid--4-8{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
.grid--8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}
.grid--3-6-3{grid-template-columns:minmax(0,3fr) minmax(0,6fr) minmax(0,3fr)}
.grid--halves{grid-template-columns:repeat(2,minmax(0,1fr))}

.card{
  position:relative;
  padding:clamp(18px,2.2vw,28px);
  background:var(--mgm-ivory);
  border:1px solid rgba(28,31,28,.14);
  box-shadow:var(--shadow-card);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.card:hover{
  transform:translateY(-3px);
  border-color:rgba(201,164,92,.7);
  box-shadow:8px 8px 0 -1px rgba(201,164,92,.18),var(--shadow-card);
}
.card__num{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;color:var(--mgm-gold)}
.card__title{margin-top:8px;font-family:var(--font-display);font-size:1.18rem;line-height:1.35;color:var(--mgm-ink-green)}
.card__text{margin-top:8px;font-size:.92rem;line-height:1.8;color:var(--mgm-graphite)}
.card__meta{
  display:block;margin-top:14px;padding-top:10px;border-top:1px dashed rgba(28,31,28,.16);
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.1em;color:var(--mgm-graphite);
}
.section--dark .card{background:rgba(244,239,228,.06);border-color:rgba(226,207,165,.26);box-shadow:none}
.section--dark .card__title{color:var(--mgm-ivory)}
.section--dark .card__text,.section--dark .card__meta{color:rgba(244,239,228,.72)}
.section--dark .card__meta{border-top-color:rgba(226,207,165,.26)}

.media{
  position:relative;overflow:hidden;aspect-ratio:4 / 3;
  background:var(--mgm-paper);
  border:1px solid rgba(28,31,28,.14);
}
.media--wide{aspect-ratio:16 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--square{aspect-ratio:1 / 1}
.media img,.media video{width:100%;height:100%;object-fit:cover;filter:saturate(.94)}
.media--framed{padding:10px;background:var(--mgm-ivory);border:1px solid rgba(201,164,92,.45)}
.media--framed img{object-fit:cover}
.media__tag{
  position:absolute;left:0;bottom:0;padding:6px 10px;
  background:var(--mgm-green-deep);color:var(--mgm-gold-soft);
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.14em;
}
.media__placeholder{
  display:grid;place-items:center;width:100%;height:100%;
  padding:16px;text-align:center;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;
  color:rgba(74,81,75,.62);
  background:repeating-linear-gradient(135deg,rgba(235,227,210,.92) 0 10px,rgba(244,239,228,.92) 10px 20px);
}
.figure{margin:0}
.figure__caption{
  margin-top:10px;font-family:var(--font-mono);font-size:.68rem;
  line-height:1.75;letter-spacing:.05em;color:var(--mgm-graphite);
}
.figure__num{color:var(--mgm-gold);margin-right:8px}

.fold{border-top:1px solid rgba(28,31,28,.16)}
.fold__summary{
  display:flex;align-items:center;gap:14px;
  padding:16px 0;cursor:pointer;list-style:none;
  font-family:var(--font-display);font-size:1.02rem;color:var(--mgm-ink-green);
}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary::after{content:"+";margin-left:auto;font-family:var(--font-mono);color:var(--mgm-gold);font-size:1rem}
.fold[open] .fold__summary::after{content:"–"}
.fold__num{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.14em;color:var(--mgm-gold)}
.fold__body{padding-bottom:18px;max-width:70ch;font-size:.94rem;color:var(--mgm-graphite)}
.section--dark .fold{border-top-color:rgba(226,207,165,.26)}
.section--dark .fold__summary{color:var(--mgm-ivory)}
.section--dark .fold__body{color:rgba(244,239,228,.76)}

.anchor-index{position:sticky;top:calc(var(--bar-h) + 24px);align-self:start}
.anchor-index__title{
  padding-bottom:10px;margin-bottom:12px;border-bottom:1px solid rgba(201,164,92,.5);
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.24em;color:var(--mgm-gold);
}
.anchor-index__list{display:flex;flex-direction:column;gap:2px}
.anchor-index__link{
  display:flex;gap:10px;padding:8px 0;text-decoration:none;
  border-bottom:1px dashed rgba(28,31,28,.14);
  font-size:.86rem;color:var(--mgm-graphite);
  transition:color .18s ease,border-color .18s ease;
}
.anchor-index__link:hover,.anchor-index__link[aria-current="true"]{color:var(--mgm-ink-green);border-bottom-color:rgba(201,164,92,.7)}

.stat{display:flex;flex-direction:column;gap:6px;padding-top:12px;border-top:1px solid rgba(28,31,28,.16)}
.stat__value{font-family:var(--font-display);font-size:clamp(1.6rem,2.6vw,2.3rem);line-height:1.1;color:var(--mgm-ink-green)}
.stat__label{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.16em;color:var(--mgm-graphite)}
.section--dark .stat{border-top-color:rgba(226,207,165,.26)}
.section--dark .stat__value{color:var(--mgm-gold-soft)}
.section--dark .stat__label{color:rgba(244,239,228,.62)}

/* ---------- 8. 响应式 ---------- */
@media (max-width:1279px){
  :root{--rail-w:216px}
  .frame-bar__hint{display:none}
}

@media (max-width:1023px){
  body{padding-left:0}

  .frame-bar{z-index:90;gap:12px;padding:0 14px}
  .frame-bar__cta{display:none}
  .nav-toggle{display:inline-flex}

  .frame-rail{
    top:var(--bar-h);
    width:min(84vw,330px);
    z-index:80;
    transform:translateX(-102%);
    transition:transform .3s cubic-bezier(.22,.7,.3,1);
    box-shadow:0 30px 70px -34px rgba(0,0,0,.8);
    padding-top:26px;
  }
  .site-header[data-open] .frame-rail{transform:translateX(0)}
  .site-nav__cta{display:inline-flex}

  .nav-scrim{
    display:block;position:fixed;inset:0;z-index:70;
    background:rgba(11,38,32,.62);border:0;cursor:pointer;
    opacity:0;pointer-events:none;
    transition:opacity .28s ease;
  }
  .site-header[data-open] .nav-scrim{opacity:1;pointer-events:auto}

  html.is-nav-open,html.is-nav-open body{overflow:hidden}

  .footer-top{grid-template-columns:minmax(0,1fr);gap:30px}
  .contact-list{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:900px){
  .grid--7-5,.grid--5-7,.grid--4-8,.grid--8-4,.grid--3-6-3,.grid--halves{
    grid-template-columns:minmax(0,1fr);
  }
  .anchor-index{position:static;top:auto}
}

@media (max-width:719px){
  .frame-bar .copy-chip{display:none}
  .brand__descriptor{display:none}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .contact-list{grid-template-columns:minmax(0,1fr)}
  .footer-legal__links{margin-left:0}
}

@media (max-width:520px){
  .brand__name{font-size:.94rem}
  .brand__glyph{width:34px;height:34px;font-size:.94rem}
  .nav-toggle__label{display:none}
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .display{font-size:clamp(2.2rem,11vw,3.4rem)}
}

/* ---------- 9. 动效克制 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .card:hover{transform:none}
}