/* ==========================================================================
   红黑娱乐会馆 · /assets/site.css
   共享外壳：变量 / reset / 中文排版 / 头部 / 页脚 / 通用组件
   ========================================================================== */

:root{
  --ink:#121316;
  --ink-2:#1C1E22;
  --ink-3:#0C0D10;
  --red:#C8102E;
  --red-deep:#7A1220;
  --amber:#C9A227;
  --warm:#8C8781;
  --paper:#F4F0E8;
  --paper-2:#FBFAF6;
  --teal:#5E7A7A;
  --glass:rgba(255,255,255,0.08);
  --glass-line:rgba(255,255,255,0.14);
  --text:#E9E4DA;
  --text-dim:rgba(244,240,232,0.64);
  --text-faint:rgba(244,240,232,0.42);
  --shell:1280px;
  --gutter:clamp(18px,4vw,48px);
  --font-display:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",Georgia,"Times New Roman",serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:220ms;
  --radius:2px;
  --rail:260px;
}

*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:140px;
}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;}
button{font:inherit;color:inherit;}
a{color:inherit;}
table{border-collapse:collapse;}

/* ---------- 中文排版基础 ---------- */
body{
  min-height:100vh;
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:0.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:300;
  line-height:1.18;
  letter-spacing:0.01em;
  color:var(--paper);
}
h1{font-size:clamp(38px,5.4vw,64px);letter-spacing:-0.012em;}
h2{font-size:clamp(26px,3.2vw,40px);}
h3{font-size:clamp(20px,2.2vw,26px);font-weight:400;}
h4{font-size:18px;font-weight:600;letter-spacing:0.04em;}
p{max-width:70ch;}
::selection{background:var(--red);color:#fff;}

#main-content{display:block;}
:target{scroll-margin-top:150px;}

/* ---------- 焦点与可访问 ---------- */
:focus-visible{
  outline:2px solid var(--amber);
  outline-offset:3px;
  border-radius:1px;
}
.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:-80px;left:var(--gutter);
  z-index:999;
  padding:11px 20px;
  background:var(--red);
  color:#fff;
  font-size:14px;
  letter-spacing:0.08em;
  text-decoration:none;
  border-radius:var(--radius);
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px;}

/* ---------- 容器与网格 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.page-grid{
  display:grid;
  grid-template-columns:var(--rail) minmax(0,1fr);
  gap:clamp(24px,4vw,64px);
  align-items:start;
}
.page-rail{position:sticky;top:clamp(112px,12vh,152px);}
.section{padding-block:clamp(48px,7vw,96px);}
.rule{height:1px;background:rgba(255,255,255,0.13);border:0;margin:0;}
.grid{display:grid;gap:clamp(18px,2.6vw,32px);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}

/* ---------- 表面切换 ---------- */
.surface-ink{
  background:var(--ink);
  color:var(--text);
}
.surface-ink h1,.surface-ink h2,.surface-ink h3,.surface-ink h4{color:var(--paper);}
.surface-paper{
  background:var(--paper);
  color:#23252A;
}
.surface-paper h1,.surface-paper h2,.surface-paper h3,.surface-paper h4{color:var(--ink);}
.surface-paper .kicker{color:var(--red-deep);}
.surface-paper .rule{background:rgba(18,19,22,0.16);}
.surface-paper a{color:var(--red-deep);}

/* ---------- 文本组件 ---------- */
.kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.22em;
  text-transform:uppercase;
  color:var(--amber);
}
.kicker::before{
  content:"";
  width:24px;height:1px;
  background:currentColor;
}
.lead{
  font-size:clamp(17px,1.35vw,20px);
  line-height:1.85;
  color:var(--text-dim);
  max-width:54ch;
}
.mono{
  font-family:var(--font-mono);
  font-size:13.5px;
  letter-spacing:0.04em;
  color:var(--warm);
  display:block;
}
.prose{
  max-width:68ch;
  font-size:17px;
  line-height:1.85;
}
.prose > * + *{margin-top:1.05em;}
.prose h2{
  font-size:clamp(22px,2.4vw,28px);
  margin-top:2.2em;
  padding-top:0.9em;
  border-top:1px solid rgba(255,255,255,0.12);
}
.prose h3{margin-top:1.8em;}
.prose ul,.prose ol{padding-left:1.4em;}
.prose ul li{list-style:none;position:relative;}
.prose ul li::before{
  content:"";
  position:absolute;left:-1em;top:0.75em;
  width:5px;height:5px;background:var(--red);
}
.prose ol{counter-reset:prose;}
.prose ol li{list-style:decimal;list-style-position:outside;}
.prose blockquote{
  border-left:2px solid var(--amber);
  padding-left:1.2em;
  color:var(--text-dim);
}
.surface-paper .prose h2{border-top-color:rgba(18,19,22,0.16);}
.surface-paper .prose blockquote{color:#4A4C52;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 24px;
  font-size:14.5px;
  letter-spacing:0.06em;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:var(--radius);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn::before{
  content:"";
  width:5px;height:5px;
  background:currentColor;
  opacity:0.75;
  flex:0 0 auto;
}
.btn--red{background:var(--red);color:#fff;border-color:var(--red);}
.btn--red:hover{background:var(--red-deep);border-color:var(--red-deep);transform:translateY(-2px);}
.btn--ghost{background:transparent;color:var(--paper);border-color:rgba(244,240,232,0.3);}
.btn--ghost:hover{color:var(--amber);border-color:var(--amber);transform:translateY(-2px);}
.btn--paper{background:var(--paper);color:var(--ink);border-color:var(--paper);}
.btn--paper:hover{background:var(--paper-2);transform:translateY(-2px);}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.1em;
  color:var(--warm);
}
.breadcrumb a{
  color:inherit;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.breadcrumb a:hover{color:var(--amber);border-bottom-color:var(--amber);}
.breadcrumb__sep{opacity:0.45;}

/* ---------- 编号索引 ---------- */
.index-list{
  display:grid;
  gap:2px;
  border-left:1px solid rgba(255,255,255,0.14);
}
.index-link{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:10px;
  align-items:baseline;
  margin-left:-1px;
  padding:10px 0 10px 14px;
  border-left:1px solid transparent;
  font-size:14px;
  color:var(--text-dim);
  text-decoration:none;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),
             background var(--dur) var(--ease);
}
.index-link__num{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:0.08em;
  color:var(--amber);
}
.index-link:hover{
  color:var(--paper);
  border-left-color:var(--red);
  background:linear-gradient(90deg,rgba(200,16,46,0.16),transparent 80%);
}
.index-link[aria-current="true"]{
  color:var(--paper);
  border-left-color:var(--amber);
  background:linear-gradient(90deg,rgba(201,162,39,0.14),transparent 80%);
}

/* ---------- 图例 ---------- */
.legend{
  display:flex;
  flex-wrap:wrap;
  gap:10px 18px;
}
.legend__item{
  display:inline-flex;
  align-items:center;
  gap:7px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.08em;
  color:var(--warm);
}
.legend__swatch{
  width:9px;height:9px;
  display:inline-block;
  flex:0 0 auto;
}
.legend__swatch--red{background:var(--red);}
.legend__swatch--amber{background:var(--amber);}
.legend__swatch--warm{background:var(--warm);}
.legend__swatch--teal{background:var(--teal);}

/* ---------- 玻璃层 ---------- */
.glass{
  background:var(--glass);
  border:1px solid var(--glass-line);
  border-radius:var(--radius);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}

/* ---------- 图片容器 ---------- */
.media{
  position:relative;
  overflow:hidden;
  margin:0;
  border-radius:var(--radius);
  border:1px solid rgba(255,255,255,0.1);
  background:linear-gradient(150deg,#22252B 0%,#121316 58%,#2A1116 100%);
}
.media::before,
.media::after{
  content:"";
  position:absolute;
  width:18px;height:18px;
  border:1px solid rgba(201,162,39,0.55);
  pointer-events:none;
}
.media::before{top:10px;left:10px;border-right:0;border-bottom:0;}
.media::after{bottom:10px;right:10px;border-left:0;border-top:0;}
.media__img{
  display:block;
  width:100%;height:100%;
  object-fit:cover;
  position:relative;
  z-index:1;
}
.media__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  z-index:2;
  padding:14px 16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.06em;
  color:rgba(244,240,232,0.82);
  background:linear-gradient(0deg,rgba(12,13,16,0.86),transparent);
}
.media--4x3{aspect-ratio:4/3;}
.media--3x2{aspect-ratio:3/2;}
.media--1x1{aspect-ratio:1/1;}
.media--21x9{aspect-ratio:21/9;}
.media--velvet{background:linear-gradient(160deg,#3B0D17 0%,#7A1220 48%,#1C1E22 100%);}
.media--brass{background:linear-gradient(150deg,#2A2418 0%,#6E5A1B 55%,#C9A227 130%);}

/* ==========================================================================
   头部
   ========================================================================== */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:
    radial-gradient(120% 160% at 12% -40%,rgba(200,16,46,0.22),transparent 62%),
    rgba(16,17,20,0.94);
  border-bottom:1px solid rgba(255,255,255,0.09);
  -webkit-backdrop-filter:blur(14px) saturate(120%);
  backdrop-filter:blur(14px) saturate(120%);
}
.site-header[data-open="true"]{
  background:rgba(12,13,16,0.99);
}

/* 上层：品牌说明 */
.header-top{
  background:var(--ink-3);
  border-bottom:1px solid rgba(201,162,39,0.2);
}
.header-top__inner{
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,22px);
  min-height:38px;
  flex-wrap:wrap;
}
.header-top__brand{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.16em;
  color:var(--paper);
}
.header-top__motto{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:0.12em;
  color:var(--amber);
}
.header-top__motto::before{
  content:"";
  width:5px;height:5px;
  background:var(--red);
  transform:rotate(45deg);
}
.header-top__hours{
  margin-left:auto;
  font-size:12px;
  letter-spacing:0.06em;
  color:var(--warm);
}

/* 下层：品牌 + 导航 + 入口 */
.header-main{position:relative;}
.header-main__inner{
  display:flex;
  align-items:center;
  gap:clamp(14px,2.6vw,36px);
  min-height:78px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--paper);
  flex:0 0 auto;
  padding-block:4px;
}
.brand__mark{
  display:grid;
  place-items:center;
  width:46px;height:46px;
  background:linear-gradient(150deg,var(--red),var(--red-deep));
  border:1px solid rgba(201,162,39,0.42);
  border-radius:var(--radius);
  font-family:var(--font-display);
  font-size:14px;
  letter-spacing:0.02em;
  line-height:1;
  color:#fff;
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.brand:hover .brand__mark{transform:translateY(-2px);border-color:var(--amber);}
.brand__text{display:block;}
.brand__name{
  display:block;
  font-family:var(--font-display);
  font-size:19px;
  letter-spacing:0.1em;
  line-height:1.3;
}
.brand__meta{
  display:block;
  margin-top:2px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:0.2em;
  color:var(--warm);
}

/* 导航 */
.primary-nav{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:clamp(14px,2.4vw,34px);
}
.primary-nav__list{
  display:flex;
  align-items:center;
  gap:clamp(12px,1.9vw,28px);
}
.primary-nav__item{display:block;}
.nav-link{
  position:relative;
  display:inline-block;
  padding:9px 2px;
  font-size:14.5px;
  letter-spacing:0.05em;
  color:rgba(244,240,232,0.76);
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:3px;
  height:1px;
  background:var(--red);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-link:hover{color:#fff;}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{color:#fff;}
.nav-link[aria-current="page"]::after{
  transform:scaleX(1);
  background:var(--amber);
}
.primary-nav__actions{
  display:flex;
  align-items:center;
  gap:8px;
  padding-left:clamp(12px,2vw,24px);
  border-left:1px solid rgba(255,255,255,0.14);
}
.entry-btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  font-size:13.5px;
  letter-spacing:0.06em;
  white-space:nowrap;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:var(--radius);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.entry-btn::before{
  content:"";
  width:5px;height:5px;
  background:currentColor;
  opacity:0.8;
  flex:0 0 auto;
}
.entry-btn--member{
  background:var(--red);
  border-color:var(--red);
  color:#fff;
}
.entry-btn--member:hover{
  background:var(--red-deep);
  border-color:var(--amber);
  transform:translateY(-2px);
}
.entry-btn--device{
  background:var(--glass);
  border-color:rgba(255,255,255,0.24);
  color:var(--paper);
}
.entry-btn--device:hover{
  background:rgba(255,255,255,0.16);
  border-color:var(--amber);
  color:#fff;
  transform:translateY(-2px);
}

/* 移动按钮 */
.nav-toggle{
  display:none;
  margin-left:auto;
  align-items:center;
  gap:9px;
  padding:9px 13px;
  background:rgba(255,255,255,0.06);
  border:1px solid rgba(255,255,255,0.22);
  border-radius:var(--radius);
  color:var(--paper);
  font-size:13px;
  letter-spacing:0.1em;
  cursor:pointer;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--amber);}
.nav-toggle__bars{
  display:inline-grid;
  gap:4px;
  width:16px;
}
.nav-toggle__bars span{
  display:block;
  height:1.5px;
  width:100%;
  background:currentColor;
  transition:transform var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{
  transform:translateY(2.75px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{
  transform:translateY(-2.75px) rotate(-45deg);
}
.nav-toggle__label{line-height:1;}

/* 滚动进度 */
.header-progress{
  height:2px;
  background:rgba(255,255,255,0.07);
  overflow:hidden;
}
.header-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--red) 0%,var(--red-deep) 55%,var(--amber) 100%);
  transition:width 90ms linear;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,110px);
  background:
    radial-gradient(90% 130% at 92% 0%,rgba(201,162,39,0.12),transparent 60%),
    linear-gradient(180deg,#101115 0%,#0A0B0E 100%);
  border-top:1px solid rgba(201,162,39,0.24);
  color:rgba(244,240,232,0.72);
}
.footer-top{padding-block:clamp(42px,6vw,78px) clamp(30px,4vw,50px);}
.footer-top__inner{
  display:grid;
  grid-template-columns:minmax(250px,1.05fr) minmax(0,2fr);
  gap:clamp(30px,5vw,80px);
  align-items:start;
}
.footer-brand__eyebrow{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:0.26em;
  color:var(--amber);
  text-transform:uppercase;
  margin-bottom:14px;
}
.footer-brand__name{
  font-family:var(--font-display);
  font-size:clamp(24px,2.6vw,32px);
  font-weight:300;
  letter-spacing:0.12em;
  color:var(--paper);
  line-height:1.3;
}
.footer-brand__line{
  margin-top:10px;
  font-size:13.5px;
  letter-spacing:0.04em;
  color:var(--warm);
  max-width:34ch;
}
.footer-legend{margin-top:24px;}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,44px);
}
.footer-col__title{
  font-family:var(--font-display);
  font-size:14px;
  font-weight:400;
  letter-spacing:0.18em;
  color:var(--amber);
  padding-bottom:10px;
  margin-bottom:16px;
  border-bottom:1px solid rgba(255,255,255,0.12);
}
.footer-col__list{display:grid;gap:11px;}
.footer-link{
  display:inline-block;
  font-size:14.5px;
  color:rgba(244,240,232,0.74);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-link:hover{
  color:#fff;
  border-bottom-color:var(--red);
}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.1);
  background:rgba(255,255,255,0.022);
  padding-block:22px 30px;
}
.footer-bottom__inner{display:grid;gap:12px;}
.footer-bottom__row{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:8px 30px;
}
.footer-contact{
  font-size:13.5px;
  color:rgba(244,240,232,0.8);
  max-width:none;
}
.footer-legal{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.1em;
  color:var(--warm);
}
.footer-note{
  font-size:12.5px;
  line-height:1.8;
  color:var(--text-faint);
  max-width:78ch;
}
.footer-copy{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.08em;
  color:var(--warm);
  margin-top:4px;
}

/* ==========================================================================
   显现动效
   ========================================================================== */
[data-reveal]{
  transition:opacity 480ms var(--ease),transform 480ms var(--ease);
}
.reveal-ready [data-reveal]{
  opacity:0;
  transform:translateY(16px);
}
.reveal-ready [data-reveal].is-in{
  opacity:1;
  transform:none;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1180px){
  .header-top__hours{display:none;}
  .primary-nav{gap:16px;}
  .nav-link{font-size:13.5px;}
  .entry-btn{padding:9px 12px;font-size:12.5px;}
}

@media (max-width:1024px){
  html{scroll-padding-top:120px;}
  .nav-toggle{display:inline-flex;}
  .primary-nav{
    position:absolute;
    left:0;right:0;top:100%;
    margin-left:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:10px var(--gutter) 26px;
    background:rgba(14,15,18,0.99);
    border-bottom:1px solid rgba(255,255,255,0.12);
    box-shadow:0 24px 48px rgba(0,0,0,0.45);
    max-height:calc(100vh - 120px);
    overflow-y:auto;
  }
  .primary-nav[data-open="true"]{display:flex;}
  .primary-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .primary-nav__item{border-bottom:1px solid rgba(255,255,255,0.08);}
  .nav-link{
    display:block;
    padding:15px 4px;
    font-size:16px;
  }
  .nav-link::after{
    bottom:9px;
    right:auto;
    width:24px;
  }
  .primary-nav__actions{
    margin-top:20px;
    padding-left:0;
    border-left:0;
    flex-wrap:wrap;
    gap:10px;
  }
  .entry-btn{
    flex:1 1 44%;
    justify-content:center;
    padding:13px 16px;
    font-size:13.5px;
  }
  .page-grid{grid-template-columns:1fr;}
  .page-rail{position:static;}
  .footer-top__inner{grid-template-columns:1fr;}
}

@media (max-width:760px){
  body{font-size:16px;}
  .header-top__motto{display:none;}
  .header-top__inner{min-height:34px;}
  .header-main__inner{min-height:68px;gap:12px;}
  .brand__mark{width:40px;height:40px;font-size:12.5px;}
  .brand__name{font-size:16.5px;}
  .brand__meta{font-size:9.5px;letter-spacing:0.16em;}
  .grid--2,.grid--3{grid-template-columns:1fr;}
  .footer-cols{grid-template-columns:1fr 1fr;}
  .footer-bottom__row{flex-direction:column;align-items:flex-start;}
  .legend{gap:8px 14px;}
}

@media (max-width:480px){
  .footer-cols{grid-template-columns:1fr;}
  .entry-btn{flex:1 1 100%;}
}

/* ==========================================================================
   减动效
   ========================================================================== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:0.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:0.001ms !important;
  }
  .reveal-ready [data-reveal]{
    opacity:1 !important;
    transform:none !important;
  }
}