/* ==========================================================================
   美高梅看台 · 共享样式 /assets/site.css
   1 变量与基础  2 排版  3 布局  4 通用组件  5 刊头  6 第一栏
   7 页脚与返回顶部  8 内容组件  9 动效  10 响应式
   ========================================================================== */

/* ---------- 1 · 变量与基础 ---------- */
:root{
  --paper:#F5EFE4;
  --paper-2:#EFE6D6;
  --sand:#D8C6A4;
  --ink:#1B1613;
  --ink-soft:rgba(27,22,19,.66);
  --red:#6E1B23;
  --red-2:#8C2F39;
  --gold:#C9A45C;
  --gold-2:#E3C98A;
  --green:#1F3A32;
  --pine:#3F6257;
  --line:rgba(201,164,92,.5);
  --line-soft:rgba(27,22,19,.15);
  --rail-w:96px;
  --wrap:1240px;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei","Heiti SC",sans-serif;
  --mono:"Fira Sans","Noto Sans SC","PingFang SC",sans-serif;
  --shadow-paper:0 1px 0 rgba(27,22,19,.05),0 18px 30px -22px rgba(27,22,19,.45);
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body{
  margin:0;
  font-family:var(--sans);
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 16% 10%,rgba(201,164,92,.12),transparent 44%),
    radial-gradient(circle at 84% 76%,rgba(110,27,35,.07),transparent 48%),
    repeating-linear-gradient(0deg,rgba(27,22,19,.022) 0 1px,transparent 1px 4px),
    repeating-linear-gradient(90deg,rgba(27,22,19,.016) 0 1px,transparent 1px 5px);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img,picture,video,canvas,svg{display:block;max-width:100%}
img{height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
main{display:block}
#main-content{scroll-margin-top:20px}

:focus-visible{outline:2px solid var(--red-2);outline-offset:3px;border-radius:2px}
.site-footer :focus-visible,
.first-column :focus-visible{outline-color:var(--gold-2)}

.visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 2 · 排版 ---------- */
h1,h2,h3,h4,h5,h6{font-family:var(--serif);font-weight:700;letter-spacing:.01em;color:var(--ink)}
h1{font-size:clamp(38px,5.2vw,56px);line-height:1.15}
h2{font-size:clamp(28px,3.4vw,36px);line-height:1.25}
h3{font-size:clamp(21px,2.2vw,24px);line-height:1.35}
h4{font-size:19px;line-height:1.45}
strong,b{font-weight:700}
small{font-size:13px}

.prose{max-width:68ch;color:var(--ink)}
.prose p{margin-bottom:1.1em}
.prose h2,.prose h3{margin:1.8em 0 .6em}
.prose h2:first-child,.prose h3:first-child{margin-top:0}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.3em}
.prose ul li{list-style:square;margin:.35em 0}
.prose ol li{list-style:decimal;margin:.35em 0}
.prose li::marker{color:var(--gold)}
.prose a{color:var(--red);border-bottom:1px solid var(--line)}
.prose a:hover{color:var(--red-2);border-bottom-color:var(--red-2)}
.prose blockquote{
  margin:1.6em 0;padding:14px 20px;border-left:3px solid var(--gold);
  background:rgba(201,164,92,.1);font-family:var(--serif);color:var(--ink);
}
.prose code{
  font-family:var(--mono);font-size:.92em;padding:2px 6px;
  background:rgba(27,22,19,.06);border:1px solid var(--line-soft);
}

/* ---------- 3 · 布局 ---------- */
.wrap{width:min(calc(100% - 40px),var(--wrap));margin-inline:auto}

.grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:24px}
.span-3{grid-column:span 3}
.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-9{grid-column:span 9}
.span-12{grid-column:span 12}

.section{padding-block:clamp(40px,6vw,84px)}
.section--wide{padding-block:clamp(64px,9vw,132px)}
.section__head{margin-bottom:clamp(24px,3vw,44px);max-width:72ch}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:12.5px;letter-spacing:.28em;
  color:var(--red);margin-bottom:14px;
}
.eyebrow::before{content:"";width:30px;height:1px;background:var(--gold)}

.rule{height:1px;border:0;background:var(--line);margin:0}
.rule--thick{height:4px;border:0;margin:0;background:repeating-linear-gradient(90deg,var(--gold) 0 16px,transparent 16px 26px)}

/* ---------- 4 · 通用组件 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;font-size:14px;letter-spacing:.16em;line-height:1.2;
  border:1px solid var(--ink);border-radius:2px;color:var(--ink);
  background:transparent;
  transition:background .2s var(--ease),color .2s var(--ease),
             border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn--solid{background:var(--red);border-color:var(--red);color:var(--paper)}
.btn--solid:hover{background:var(--red-2);border-color:var(--red-2);color:var(--paper)}
.btn--gold{border-color:var(--gold);color:var(--gold-2)}
.btn--gold:hover{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.btn--sm{padding:8px 14px;font-size:12.5px;letter-spacing:.12em}

.tag{
  display:inline-block;padding:3px 10px;border-radius:1px;
  font-family:var(--mono);font-size:12px;letter-spacing:.16em;line-height:1.6;
  border:1px solid var(--line);color:var(--red);background:rgba(110,27,35,.06);
}
.tag--red{background:var(--red);border-color:var(--red);color:var(--paper)}
.tag--gold{background:var(--gold-2);border-color:var(--gold);color:var(--ink)}
.tag--green{background:rgba(63,98,87,.14);border-color:var(--pine);color:var(--green)}

.stamp{
  display:inline-grid;place-items:center;width:54px;height:54px;
  font-family:var(--serif);font-size:24px;color:var(--paper);
  background:var(--red);border:1px solid var(--gold-2);
  box-shadow:0 0 0 3px rgba(110,27,35,.14);transform:rotate(-4deg);
}

.card{
  background:rgba(255,255,255,.62);
  border:1px solid var(--line-soft);border-radius:2px;padding:22px;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:var(--gold);box-shadow:var(--shadow-paper)}

.panel{
  border:1px solid var(--line-soft);border-radius:2px;
  background:rgba(255,255,255,.55);overflow:hidden;
}
.panel + .panel{margin-top:12px}
.panel__summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 20px;cursor:pointer;list-style:none;
  font-family:var(--serif);font-size:18px;color:var(--ink);
}
.panel__summary::-webkit-details-marker{display:none}
.panel__summary::after{content:"＋";color:var(--gold);font-size:17px;line-height:1}
.panel[open] .panel__summary{background:rgba(201,164,92,.14);border-bottom:1px solid var(--line)}
.panel[open] .panel__summary::after{content:"－"}
.panel__body{padding:18px 20px;font-size:16px;color:var(--ink-soft);animation:panelIn .24s var(--ease) both}
@keyframes panelIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

.rail{position:relative}
.rail::after{
  content:"";position:absolute;top:0;right:0;width:56px;height:100%;
  background:linear-gradient(90deg,rgba(245,239,228,0),var(--paper));
  pointer-events:none;
}
.rail__track{
  display:flex;gap:16px;overflow-x:auto;overscroll-behavior-x:contain;
  scroll-snap-type:x proximity;padding:4px 56px 18px 0;
  -webkit-overflow-scrolling:touch;
}
.rail__card{flex:0 0 clamp(228px,26vw,306px);scroll-snap-align:start}

.figure{margin:0}
.figure__frame{
  padding:8px;background:rgba(255,255,255,.6);
  border:1px solid var(--line);box-shadow:var(--shadow-paper);
}
.figure__img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  background:
    linear-gradient(135deg,rgba(31,58,50,.22),rgba(201,164,92,.28)),
    var(--paper-2);
}
.figure--wide .figure__img{aspect-ratio:16/9}
.figure--tall .figure__img{aspect-ratio:3/4}
.figure--square .figure__img{aspect-ratio:1/1}
.figure__cap{
  margin-top:10px;font-family:var(--mono);font-size:13px;
  letter-spacing:.05em;color:var(--ink-soft);
}

.stat{display:flex;flex-direction:column;gap:6px}
.stat__num{
  font-family:var(--serif);font-weight:700;line-height:1;
  font-size:clamp(40px,6vw,64px);color:var(--red-2);
  font-variant-numeric:tabular-nums;
}
.stat__label{font-family:var(--mono);font-size:12.5px;letter-spacing:.2em;color:var(--ink-soft)}

.toc__list{display:flex;flex-direction:column;gap:2px;border-left:1px solid var(--line);padding-left:14px}
.toc__link{
  display:block;padding:6px 0;font-size:14px;line-height:1.5;
  color:var(--ink-soft);transition:color .2s var(--ease);
}
.toc__link:hover{color:var(--red)}
.toc__link[aria-current="true"]{color:var(--red-2);font-weight:700}

.breadcrumb{padding-top:20px;font-family:var(--mono);font-size:13px;letter-spacing:.08em;color:var(--ink-soft)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__list li{display:flex;align-items:center;gap:8px}
.breadcrumb__list li::after{content:"／";color:var(--gold)}
.breadcrumb__list li:last-child::after{content:""}
.breadcrumb a:hover{color:var(--red)}

/* ---------- 5 · 刊头 ---------- */
.skip-link{
  position:fixed;top:-120px;left:16px;z-index:120;
  padding:10px 18px;font-size:14px;letter-spacing:.1em;
  background:var(--red);color:var(--paper);border:1px solid var(--gold);
  border-radius:2px;transition:top .2s var(--ease);
}
.skip-link:focus{top:16px}

.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:110;
  transform:scaleX(0);transform-origin:0 50%;pointer-events:none;
  background:linear-gradient(90deg,var(--gold),var(--red-2));
}

.site-header{
  position:relative;z-index:30;
  border-bottom:1px solid var(--line);
}
.site-header::after{
  content:"";display:block;height:1px;margin-top:3px;
  background:var(--line);opacity:.6;
}

.masthead{
  position:relative;
  padding:34px 20px 0;
  text-align:center;
}
.masthead__kicker{
  margin:0 0 12px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.36em;
  color:var(--red);text-indent:.36em;
}
.masthead__brand{display:inline-flex;flex-direction:column;align-items:center;gap:8px}
.masthead__brand-cn{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(32px,5.4vw,58px);line-height:1.1;
  letter-spacing:.14em;text-indent:.14em;color:var(--ink);
  transition:color .2s var(--ease);
}
.masthead__brand-en{
  font-family:var(--mono);font-size:11px;letter-spacing:.4em;
  text-indent:.4em;color:var(--gold);
}
.masthead__brand:hover .masthead__brand-cn{color:var(--red)}
.masthead__brand:hover .masthead__brand-en{color:var(--red-2)}
.masthead__tagline{
  margin:14px 0 0;
  font-family:var(--mono);font-size:12.5px;letter-spacing:.22em;
  color:var(--ink-soft);
}
.masthead__seal{display:none}

.nav-toggle{
  display:inline-flex;align-items:center;gap:10px;
  margin-top:20px;padding:10px 18px;
  font-size:13px;letter-spacing:.2em;color:var(--ink);
  border:1px solid var(--ink);border-radius:2px;background:transparent;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--red);color:var(--red)}
.nav-toggle[aria-expanded="true"]{background:var(--red);border-color:var(--red);color:var(--paper)}
.nav-toggle__bars{position:relative;width:16px;height:10px;border-top:1px solid currentColor;border-bottom:1px solid currentColor}
.nav-toggle__bars::after{content:"";position:absolute;left:0;right:0;top:50%;border-top:1px solid currentColor}

.site-nav{padding:0 20px}
.site-nav__list{display:flex;flex-wrap:wrap;justify-content:center;gap:2px 4px;padding:16px 0 14px}
.site-nav__item{display:flex}
.site-nav a{
  display:block;padding:8px 16px;
  font-size:14px;letter-spacing:.16em;color:var(--ink);
  border:1px solid transparent;border-radius:2px;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.site-nav a:hover{border-color:var(--gold);color:var(--red);background:rgba(201,164,92,.12)}
.site-nav a[aria-current="page"]{background:var(--red);border-color:var(--red);color:var(--paper)}

/* ---------- 6 · 第一栏 ---------- */
.first-column{
  position:relative;z-index:40;
  color:var(--paper);
  background:linear-gradient(180deg,#1B1613 0%,#241B18 46%,#1F3A32 100%);
  border-block:1px solid var(--gold);
}
.first-column__label{
  margin:0;padding:10px 16px 0;
  font-family:var(--serif);font-size:13px;letter-spacing:.26em;
  color:var(--gold-2);
}
.first-column__list{
  display:flex;gap:8px;padding:10px 16px 14px;
  overflow-x:auto;scroll-snap-type:x proximity;
  -webkit-overflow-scrolling:touch;
}
.first-column__item{flex:0 0 auto;scroll-snap-align:start}
.first-column__item a{
  display:flex;align-items:center;gap:8px;
  padding:8px 12px;white-space:nowrap;
  font-size:13px;letter-spacing:.1em;color:var(--paper);
  border:1px solid rgba(201,164,92,.34);border-radius:2px;
  transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.first-column__item a:hover{background:rgba(201,164,92,.16);border-color:var(--gold-2)}
.first-column__item a[aria-current="page"]{background:var(--red);border-color:var(--gold-2)}
.first-column__num{font-family:var(--mono);font-size:11px;color:var(--gold-2);line-height:1}

/* ---------- 7 · 页脚与返回顶部 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,112px);
  color:var(--paper);
  background-color:var(--green);
  background-image:radial-gradient(circle at 12% 0%,rgba(201,164,92,.18),transparent 58%);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:repeating-linear-gradient(90deg,var(--gold) 0 20px,rgba(201,164,92,.28) 20px 28px);
}
.site-footer__inner{
  display:grid;grid-template-columns:1.25fr 1fr 1.15fr;
  gap:40px;padding:60px 0 44px;
}
.site-footer__mark{
  font-family:var(--serif);font-weight:700;font-size:26px;
  letter-spacing:.14em;color:var(--paper);margin-bottom:14px;
}
.site-footer__line{
  font-size:15px;line-height:1.8;max-width:34ch;
  color:rgba(245,239,228,.78);margin-bottom:22px;
}
.footer-nav__title,.footer-contact__title{
  font-family:var(--mono);font-size:12px;letter-spacing:.28em;
  color:var(--gold-2);margin-bottom:16px;
}
.footer-nav__list li{margin-bottom:2px}
.footer-nav__list a{
  display:inline-block;padding:5px 0;font-size:15px;
  color:rgba(245,239,228,.86);border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-nav__list a:hover{color:var(--gold-2);border-bottom-color:var(--gold)}
.footer-nav__list a[aria-current="page"]{color:var(--gold-2);border-bottom-color:var(--gold-2)}

.footer-contact__list{margin-bottom:14px}
.contact-line{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:8px;
  padding:9px 0;border-bottom:1px dashed rgba(201,164,92,.3);
}
.contact-line__key{
  flex:0 0 70px;font-family:var(--mono);font-size:12px;
  letter-spacing:.16em;color:var(--gold-2);
}
.contact-line__val{font-size:15px;color:var(--paper);word-break:break-word}
.copy-btn{
  padding:3px 10px;font-size:12px;letter-spacing:.1em;
  color:var(--gold-2);border:1px solid rgba(201,164,92,.55);border-radius:2px;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.copy-btn:hover{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.copy-status{font-size:12px;letter-spacing:.08em;color:var(--gold-2);min-height:1em}
.footer-contact__note{
  font-size:13px;line-height:1.7;color:rgba(245,239,228,.6);
}

.site-footer__meta{
  border-top:1px solid rgba(201,164,92,.35);
  background:rgba(0,0,0,.18);
}
.site-footer__meta-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 28px;padding:20px 0;
  font-family:var(--mono);font-size:12.5px;letter-spacing:.1em;
  color:rgba(245,239,228,.72);
}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal a{border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease)}
.footer-legal a:hover{color:var(--gold-2);border-bottom-color:var(--gold)}

.back-to-top{
  position:fixed;right:20px;bottom:20px;z-index:100;
  display:inline-flex;align-items:center;
  padding:12px 16px;font-size:12px;letter-spacing:.18em;
  color:var(--paper);background:var(--red);border:1px solid var(--gold);
  border-radius:2px;box-shadow:0 14px 26px -16px rgba(27,22,19,.8);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .24s var(--ease),transform .24s var(--ease),
             visibility .24s var(--ease),background .2s var(--ease);
}
.back-to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.back-to-top:hover{background:var(--red-2)}

/* ---------- 8 · 动效 ---------- */
@media (prefers-reduced-motion:no-preference){
  [data-reveal="pending"]{
    opacity:0;transform:translateY(16px);
    transition:opacity .6s var(--ease),transform .6s var(--ease);
  }
  [data-reveal="pending"].is-visible{opacity:1;transform:none}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}

/* ---------- 9 · 响应式 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .masthead{padding:46px 128px 4px}
  .masthead__tagline{
    position:absolute;top:50%;right:26px;margin:0;
    transform:translateY(-50%);writing-mode:vertical-rl;
    letter-spacing:.34em;font-size:12px;color:var(--red);
  }
  .masthead__seal{
    display:grid;position:absolute;top:50%;left:26px;
    width:56px;height:56px;place-items:center;
    transform:translateY(-50%) rotate(-6deg);
    font-family:var(--serif);font-size:24px;color:var(--paper);
    background:var(--red);border:1px solid var(--gold-2);
    box-shadow:0 0 0 3px rgba(110,27,35,.16);
  }
  .first-column{
    position:fixed;left:0;top:0;bottom:0;width:var(--rail-w);
    display:flex;flex-direction:column;gap:20px;
    padding:24px 8px;overflow-y:auto;
    border-block:0;border-right:1px solid rgba(201,164,92,.5);
  }
  .first-column__label{
    padding:6px 0;margin-inline:auto;text-align:center;
    writing-mode:vertical-rl;letter-spacing:.3em;
    border-block:1px solid rgba(201,164,92,.42);
  }
  .first-column__list{
    flex-direction:column;gap:4px;padding:0;overflow:visible;
  }
  .first-column__item a{
    flex-direction:column;align-items:center;gap:3px;
    padding:9px 4px;white-space:normal;text-align:center;line-height:1.35;
  }
}

@media (min-width:900px){
  .nav-toggle{display:none}
}

@media (max-width:899px){
  .site-nav{
    max-height:0;overflow:hidden;visibility:hidden;
    border-top:1px solid transparent;
    transition:max-height .34s var(--ease),visibility .34s var(--ease),border-color .34s var(--ease);
  }
  .site-nav[data-open]{
    max-height:min(70vh,520px);overflow-y:auto;visibility:visible;
    border-top-color:var(--line-soft);
  }
  .site-nav__list{flex-direction:column;align-items:stretch;gap:6px;padding:12px 0 18px}
  .site-nav a{text-align:center;border-color:var(--line-soft)}
}

@media (max-width:1100px){
  .span-3,.span-4{grid-column:span 6}
  .span-5,.span-7,.span-8,.span-9{grid-column:span 12}
  .site-footer__inner{grid-template-columns:1fr 1fr;gap:36px}
  .site-footer__brand{grid-column:1 / -1}
}

@media (max-width:720px){
  body{font-size:16.5px}
  .wrap{width:calc(100% - 32px)}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9{grid-column:span 12}
  .site-footer__inner{grid-template-columns:1fr;gap:32px;padding:44px 0 32px}
  .site-footer__meta-inner{flex-direction:column;align-items:flex-start;gap:8px}
  .contact-line__key{flex-basis:60px}
  .back-to-top{right:12px;bottom:12px;padding:10px 13px}
  .rail__card{flex:0 0 78%}
}