/* ==========================================================================
   美高梅主站 · 共享样式表  /assets/site.css
   墨色外壳 + 暖纸内容 + 金属金线 + 翡翠/深红印刷色
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink-900:#08080A;
  --ink-850:#0D0D10;
  --ink-800:#121216;
  --ink-700:#1B1B21;
  --ink-600:#26262E;
  --ink-500:#3A3A44;

  --paper:#F5F0E6;
  --paper-2:#E7DFD0;
  --paper-3:#CFC6B4;
  --paper-ink:#16161A;

  --gold:#C9A227;
  --gold-bright:#E9C96A;
  --gold-deep:#8B6C15;
  --gold-line:rgba(201,162,39,.34);
  --gold-line-soft:rgba(201,162,39,.16);

  --jade:#0F6B4F;
  --jade-bright:#1AA57A;
  --crimson:#7A1F2B;
  --crimson-bright:#A82A3C;

  --bg:var(--paper);
  --fg:var(--paper-ink);
  --muted:#6A6357;

  --font-display:"Songti SC","Noto Serif SC",Cambria,Georgia,"Times New Roman",serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;

  --radius:2px;
  --cut:18px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:.42s;
  --shadow-gold:0 18px 40px -28px rgba(201,162,39,.6);
}

/* ---------- 2. 重置与基础 ---------- */
*,
*::before,
*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:104px;
}

body{
  margin:0;
  background-color:var(--bg);
  background-image:
    radial-gradient(1200px 620px at 88% -8%, rgba(201,162,39,.15), transparent 62%),
    radial-gradient(900px 520px at -6% 12%, rgba(15,107,79,.09), transparent 58%),
    linear-gradient(180deg,#F8F4EC 0%, var(--paper) 44%, #EFE7D9 100%);
  background-attachment:fixed;
  color:var(--fg);
  font-family:var(--font-body);
  font-size:clamp(.95rem,.92rem + .18vw,1.0625rem);
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.24;
  letter-spacing:-.004em;
  margin:0 0 .62em;
  color:var(--ink-900);
}
h1{font-size:clamp(2.05rem,1.35rem + 3.1vw,3.7rem)}
h2{font-size:clamp(1.55rem,1.15rem + 1.8vw,2.45rem)}
h3{font-size:clamp(1.18rem,1.03rem + .8vw,1.6rem)}
h4{font-size:1.06rem}
h5{font-size:.97rem}

p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}

a{color:inherit;text-decoration:none;transition:color .22s ease}
a:hover{color:var(--gold-deep)}

img,picture,video,svg{max-width:100%}
img{height:auto;border-style:none}

ul,ol{padding-left:1.25em;margin:0 0 1.1em}
li{margin-bottom:.35em}

hr{border:0;height:1px;background:var(--gold-line-soft);margin:2rem 0}

::selection{background:rgba(201,162,39,.32);color:var(--ink-900)}

:focus-visible{
  outline:2px solid var(--gold-bright);
  outline-offset:3px;
  border-radius:var(--radius);
}

/* ---------- 3. 无障碍工具 ---------- */
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
  border:0;
}

.skip-link{
  position:fixed;
  left:1rem;
  top:-120px;
  z-index:220;
  padding:.72rem 1.15rem;
  background:linear-gradient(135deg,var(--gold-bright),var(--gold));
  color:#12100A;
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.12em;
  border-radius:var(--radius);
  box-shadow:var(--shadow-gold);
  transition:top .22s ease;
}
.skip-link:focus{top:1rem;color:#12100A}

/* ---------- 4. 布局与节奏 ---------- */
.container{
  width:100%;
  max-width:1220px;
  margin-inline:auto;
  padding-inline:clamp(1.15rem,4vw,2.6rem);
}

.section{padding-block:clamp(2.8rem,6vw,5rem)}
.section-tight{padding-block:clamp(1.8rem,4vw,3rem)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:1rem 2.2rem;
  margin-bottom:clamp(1.4rem,3vw,2.2rem);
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(1.5rem,1.15rem + 1.5vw,2.35rem);
  margin:0;
}
.section-lead{max-width:58ch;margin:0;color:var(--muted)}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--font-mono);
  font-size:.73rem;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--gold-deep);
  margin:0 0 .9rem;
}
.eyebrow::before{
  content:"";
  width:30px;
  height:1px;
  background:linear-gradient(90deg,var(--gold),transparent);
}

.rule-gold{
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,transparent,var(--gold-line) 12%,var(--gold) 50%,var(--gold-line) 88%,transparent);
}

.grid{display:grid;gap:clamp(1.2rem,3vw,2rem)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

.panel{
  position:relative;
  background:#FDFBF6;
  border:1px solid rgba(22,22,26,.1);
  border-top:2px solid var(--gold);
  border-radius:var(--radius);
  padding:clamp(1.2rem,3vw,1.9rem);
}
.panel-ink{
  background:linear-gradient(160deg,var(--ink-800),var(--ink-900));
  border-color:rgba(201,162,39,.28);
  border-top-color:var(--gold-bright);
  color:rgba(245,240,230,.82);
}
.panel-ink h2,.panel-ink h3,.panel-ink h4{color:var(--paper)}
.panel-ink a{color:var(--gold-bright)}

.prose{max-width:72ch}
.prose h2{margin-top:2.3em}
.prose h3{margin-top:1.8em}
.prose > :first-child{margin-top:0}

/* ---------- 5. 按钮 ---------- */
.btn{
  --btn-bg:linear-gradient(135deg,var(--gold-bright),var(--gold));
  --btn-fg:#12100A;
  --btn-bd:rgba(233,201,106,.75);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  padding:.74rem 1.4rem;
  font-family:var(--font-mono);
  font-size:.8rem;
  letter-spacing:.14em;
  line-height:1.2;
  color:var(--btn-fg);
  background:var(--btn-bg);
  border:1px solid var(--btn-bd);
  border-radius:var(--radius);
  cursor:pointer;
  clip-path:polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition:transform var(--dur) var(--ease), background .25s ease, color .25s ease,
             border-color .25s ease, box-shadow .25s ease;
}
.btn:hover{transform:translateY(-2px)}

.btn-gold{
  --btn-bg:linear-gradient(135deg,var(--gold-bright),var(--gold) 52%,var(--gold-deep));
  --btn-fg:#12100A;
  --btn-bd:rgba(233,201,106,.75);
  box-shadow:var(--shadow-gold);
}
.btn-gold:hover{
  --btn-bg:linear-gradient(135deg,#F4DC92,var(--gold-bright) 52%,var(--gold));
  color:#0A0906;
}

.btn-ink{
  --btn-bg:linear-gradient(160deg,var(--ink-700),var(--ink-900));
  --btn-fg:var(--paper);
  --btn-bd:var(--ink-900);
}
.btn-ink:hover{--btn-fg:var(--gold-bright);border-color:var(--gold-line)}

.btn-outline{
  --btn-bg:transparent;
  --btn-fg:var(--paper);
  --btn-bd:var(--gold-line);
}
.btn-outline:hover{
  --btn-bg:rgba(201,162,39,.14);
  --btn-fg:var(--gold-bright);
  --btn-bd:var(--gold);
}

/* ---------- 6. 图片容器基础规则 ---------- */
.figure-frame{
  position:relative;
  display:block;
  margin:0;
  overflow:hidden;
  background:
    linear-gradient(135deg, rgba(201,162,39,.18), rgba(15,107,79,.1) 46%, rgba(122,31,43,.16)),
    var(--ink-800);
  border:1px solid var(--gold-line-soft);
  clip-path:polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}
.figure-frame > img,
.figure-frame > picture > img,
.figure-frame > .figure-media{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure-frame[data-empty]::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(135deg, rgba(201,162,39,.14) 0 1px, transparent 1px 14px);
}
.figure-caption{
  margin-top:.7rem;
  font-family:var(--font-mono);
  font-size:.71rem;
  letter-spacing:.1em;
  color:var(--muted);
}
.ratio-16x9{aspect-ratio:16 / 9}
.ratio-4x3{aspect-ratio:4 / 3}
.ratio-1x1{aspect-ratio:1 / 1}
.ratio-3x4{aspect-ratio:3 / 4}

/* ---------- 7. 面包屑 ---------- */
.breadcrumb{
  margin:0 0 1.6rem;
  font-family:var(--font-mono);
  font-size:.73rem;
  letter-spacing:.12em;
}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  list-style:none;
  margin:0;
  padding:0;
  color:var(--muted);
}
.breadcrumb-item{margin:0;display:inline-flex;align-items:center}
.breadcrumb-item::after{
  content:"/";
  margin-left:.5rem;
  color:var(--gold-deep);
}
.breadcrumb-item:last-child::after{content:""}
.breadcrumb-link{color:var(--muted)}
.breadcrumb-link:hover{color:var(--gold-deep)}
.breadcrumb-link[aria-current="page"]{
  color:var(--ink-900);
  border-bottom:1px solid var(--gold);
}

/* ---------- 8. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  color:var(--paper);
  background:linear-gradient(180deg, rgba(8,8,10,.985), rgba(13,13,16,.955));
  border-bottom:1px solid var(--gold-line-soft);
}
.header-accent{
  display:block;
  height:3px;
  background:linear-gradient(90deg,var(--crimson) 0%,var(--gold-deep) 18%,var(--gold-bright) 50%,var(--jade) 82%,var(--crimson) 100%);
}
.header-inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:1.25rem;
  min-height:76px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:.72rem;
  flex:0 0 auto;
  color:var(--paper);
}
.brand:hover{color:var(--paper)}
.brand-mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  flex:0 0 auto;
  background:linear-gradient(140deg,var(--gold-bright),var(--gold-deep));
  color:#100E07;
  font-family:var(--font-display);
  font-size:1.15rem;
  font-weight:700;
  clip-path:polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 9px 100%, 0 calc(100% - 9px));
}
.brand-text{display:flex;flex-direction:column;line-height:1.12}
.brand-name{
  font-family:var(--font-display);
  font-size:1.06rem;
  letter-spacing:.14em;
  color:var(--paper);
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:.58rem;
  letter-spacing:.32em;
  color:var(--gold);
  text-transform:uppercase;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.6rem;
  margin-left:auto;
  padding:.55rem .9rem;
  background:transparent;
  border:1px solid var(--gold-line);
  border-radius:var(--radius);
  color:var(--gold-bright);
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.18em;
  cursor:pointer;
  transition:background-color .22s ease, border-color .22s ease, color .22s ease;
}
.nav-toggle:hover{background-color:rgba(201,162,39,.12);border-color:var(--gold)}
.nav-toggle-bars{
  position:relative;
  display:inline-block;
  width:18px;
  height:12px;
  border-top:1.5px solid currentColor;
  border-bottom:1.5px solid currentColor;
}
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;right:0;top:50%;
  height:1.5px;
  background:currentColor;
  transform:translateY(-50%);
  transition:transform .3s var(--ease), opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{
  transform:translateY(-50%) rotate(90deg);
  opacity:.35;
}

.site-nav{
  display:flex;
  align-items:center;
  gap:1.5rem;
  margin-left:auto;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:.12rem;
  margin:0;
  padding:0;
  list-style:none;
}
.nav-item{position:relative;margin:0}
.nav-link{
  display:inline-flex;
  align-items:center;
  gap:.42rem;
  padding:.55rem .72rem;
  color:rgba(245,240,230,.72);
  font-size:.92rem;
  letter-spacing:.06em;
  border-bottom:2px solid transparent;
  border-radius:var(--radius);
  transition:color .2s ease, background-color .2s ease, border-color .2s ease;
}
.nav-index{
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.06em;
  color:var(--gold-deep);
  transition:color .2s ease;
}
.nav-label{white-space:nowrap}
.nav-link:hover{
  color:var(--gold-bright);
  background-color:rgba(201,162,39,.09);
}
.nav-link:hover .nav-index{color:var(--gold-bright)}
.nav-link[aria-current="page"]{
  color:var(--gold-bright);
  border-bottom-color:var(--gold);
}
.nav-link[aria-current="page"] .nav-index{color:var(--gold-bright)}

.nav-cta{display:flex;align-items:center;gap:.6rem}
.nav-cta .btn{padding:.6rem 1.05rem;font-size:.75rem}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3.5rem,7vw,6rem);
  color:rgba(245,240,230,.74);
  font-size:.92rem;
  background:
    radial-gradient(900px 420px at 84% 0%, rgba(201,162,39,.15), transparent 60%),
    radial-gradient(720px 380px at 2% 100%, rgba(122,31,43,.24), transparent 62%),
    linear-gradient(180deg,var(--ink-850) 0%, var(--ink-900) 100%);
}
.footer-rule{
  height:4px;
  background:linear-gradient(90deg,var(--crimson),var(--gold-deep) 22%,var(--gold-bright) 50%,var(--jade) 78%,var(--crimson));
}
.footer-inner{
  display:grid;
  grid-template-columns:minmax(240px,1.6fr) repeat(2,minmax(150px,1fr)) minmax(210px,1.25fr);
  gap:clamp(1.6rem,4vw,3.2rem);
  padding-block:clamp(2.6rem,6vw,4.2rem);
}

.footer-brand{min-width:0}
.footer-wordmark{
  font-family:var(--font-display);
  font-size:clamp(1.5rem,1.2rem + 1.2vw,2.1rem);
  letter-spacing:.16em;
  color:var(--paper);
  margin:0 0 .55rem;
}
.footer-wordmark::after{
  content:"";
  display:block;
  width:54px;
  height:2px;
  margin-top:.75rem;
  background:linear-gradient(90deg,var(--gold-bright),transparent);
}
.footer-statement{
  max-width:36ch;
  color:rgba(245,240,230,.64);
  margin:0 0 1.15rem;
}
.footer-tags{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem;
  list-style:none;
  margin:0;
  padding:0;
}
.footer-tag{
  margin:0;
  padding:.3rem .62rem;
  font-family:var(--font-mono);
  font-size:.65rem;
  letter-spacing:.16em;
  color:var(--gold);
  background-color:rgba(201,162,39,.07);
  border:1px solid var(--gold-line-soft);
}

.footer-col{min-width:0}
.footer-heading{
  font-family:var(--font-mono);
  font-size:.69rem;
  font-weight:400;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--gold);
  margin:0 0 1rem;
}
.footer-list{
  display:grid;
  gap:.55rem;
  list-style:none;
  margin:0;
  padding:0;
}
.footer-list li{margin:0}
.footer-link{
  display:inline-block;
  color:rgba(245,240,230,.72);
  transition:color .2s ease, padding-left .25s var(--ease);
}
.footer-link:hover{color:var(--gold-bright);padding-left:.35rem}
.footer-link-quiet:hover{padding-left:0}

.footer-contact-list{gap:.85rem}
.footer-contact-item{
  display:grid;
  grid-template-columns:3.1rem 1fr;
  gap:.6rem;
  align-items:baseline;
}
.footer-contact-key{
  font-family:var(--font-mono);
  font-size:.65rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--gold-deep);
}
.footer-contact-val{
  color:rgba(245,240,230,.84);
  line-height:1.62;
  word-break:break-word;
}
.footer-hint{
  margin:1.05rem 0 0;
  font-size:.79rem;
  color:rgba(245,240,230,.48);
}

.footer-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.8rem;
  padding-block:1.25rem 1.7rem;
  border-top:1px solid rgba(245,240,230,.09);
  font-size:.78rem;
  color:rgba(245,240,230,.5);
}
.footer-copy{margin:0}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  margin:0;
}
.footer-dot{color:var(--gold-deep)}
.footer-icp{
  font-family:var(--font-mono);
  letter-spacing:.06em;
  color:rgba(245,240,230,.58);
}

/* ---------- 10. 滚动工具（JS 注入） ---------- */
.scroll-progress{
  position:fixed;
  top:0;left:0;
  width:100%;
  height:3px;
  z-index:150;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--crimson),var(--gold) 45%,var(--gold-bright) 70%,var(--jade));
  pointer-events:none;
}

.back-to-top{
  position:fixed;
  right:clamp(1rem,3vw,2rem);
  bottom:clamp(1rem,3vw,2rem);
  z-index:120;
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  padding:.72rem 1.05rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.16em;
  color:#12100A;
  background:linear-gradient(135deg,var(--gold-bright),var(--gold));
  border:1px solid rgba(233,201,106,.8);
  border-radius:var(--radius);
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(14px);
  box-shadow:var(--shadow-gold);
  clip-path:polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 9px 100%, 0 calc(100% - 9px));
  transition:opacity .3s ease, transform .3s var(--ease), visibility .3s;
}
.back-to-top[data-visible]{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

/* ---------- 11. 滚动显现 ---------- */
.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .62s var(--ease), transform .62s var(--ease);
}
.js-reveal [data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1080px){
  .brand-sub{letter-spacing:.24em}
  .nav-link{padding:.5rem .5rem;font-size:.86rem}
  .nav-index{display:none}
}

@media (max-width:980px){
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:block;
    margin-left:0;
    padding:1rem clamp(1.15rem,4vw,2.6rem) 1.4rem;
    background:linear-gradient(180deg,var(--ink-850),var(--ink-900));
    border-top:1px solid var(--gold-line-soft);
    border-bottom:1px solid var(--gold);
    box-shadow:0 26px 48px -30px rgba(0,0,0,.92);
    max-height:0;
    opacity:0;
    visibility:hidden;
    overflow:hidden;
    transition:max-height .4s var(--ease), opacity .28s ease, visibility .4s linear;
  }
  .site-nav[data-open]{
    max-height:min(78vh,620px);
    opacity:1;
    visibility:visible;
    overflow-y:auto;
    -webkit-overflow-scrolling:touch;
  }

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-index{display:inline}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:.88rem .4rem;
    font-size:1rem;
    border-bottom:1px solid rgba(245,240,230,.08);
    border-left:2px solid transparent;
    border-radius:0;
  }
  .nav-link[aria-current="page"]{
    border-bottom-color:rgba(245,240,230,.08);
    border-left-color:var(--gold);
    background-color:rgba(201,162,39,.08);
    padding-left:.75rem;
  }
  .nav-cta{margin-top:1.15rem}
  .nav-cta .btn{width:100%}

  .footer-inner{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:2rem 2.4rem;
  }
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:900px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:620px){
  .header-inner{min-height:68px}
  .brand-mark{width:34px;height:34px;font-size:1.02rem}
  .brand-name{font-size:1rem;letter-spacing:.1em}
  .brand-sub{display:none}

  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
  .footer-bar{flex-direction:column;align-items:flex-start}
  .footer-contact-item{grid-template-columns:1fr;gap:.15rem}
  .back-to-top{padding:.65rem .85rem;font-size:.66rem}
}

/* ---------- 13. 动效降级 ---------- */
@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;
  }
  .js-reveal [data-reveal],
  .js-reveal [data-reveal].is-revealed{
    opacity:1;
    transform:none;
  }
  .back-to-top{transform:none}
}