/* ==========================================================================
   77棋牌局 · 共享样式 /assets/site.css
   设计语言：深夜牌局 × 数字档案库 · 堆叠面板 · 极细描边 · 等宽索引
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#04140F;
  --panel:#0B2A22;
  --panel-deep:#08201A;
  --rule:#16453A;
  --cyan:#19F0C8;
  --cyan-dim:#0E9E86;
  --red:#F0453F;
  --gold:#F2C14E;
  --violet:#A06BFF;
  --paper:#F4EFE4;
  --paper-line:#D8CDB8;
  --text:#EAF6F2;
  --muted:#93B0A8;

  --font-display:"Archivo Narrow","Oswald","PingFang SC","Hiragino Sans GB","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --shell:1280px;
  --gutter:clamp(16px,4vw,40px);
  --gap:24px;
  --ease:cubic-bezier(0.22,0.61,0.36,1);
  --hair:1px solid var(--rule);
  --shadow-panel:0 2px 6px rgba(0,0,0,0.38);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(1200px 600px at 82% -8%,rgba(25,240,200,0.07),transparent 62%),
    radial-gradient(900px 520px at 4% 108%,rgba(160,107,255,0.07),transparent 60%),
    repeating-linear-gradient(0deg,rgba(255,255,255,0.014) 0 1px,transparent 1px 4px);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.8;
  letter-spacing:0.01em;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{max-width:100%;}
img{height:auto;border-style:none;}
h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:600;
  letter-spacing:-0.02em;
  line-height:1.15;
  margin:0;
}
p{margin:0;}
ul,ol{margin:0;padding:0;}
li{list-style:none;}
a{color:var(--cyan);text-decoration:none;}
button{font-family:inherit;}
table{border-collapse:collapse;width:100%;}
hr{border:0;height:1px;background:var(--rule);margin:0;}
:focus{outline:none;}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;}
::selection{background:rgba(25,240,200,0.28);color:#fff;}

/* ---------- 3. 排版工具 ---------- */
.mono,
.num{
  font-family:var(--font-mono);
  letter-spacing:0.04em;
  font-variant-numeric:tabular-nums;
}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.display-xl{
  font-family:var(--font-display);font-weight:600;
  font-size:clamp(40px,7vw,96px);line-height:1.02;letter-spacing:-0.02em;
}
.display-l{
  font-family:var(--font-display);font-weight:600;
  font-size:clamp(30px,4.6vw,64px);line-height:1.06;letter-spacing:-0.02em;
}
.display-m{
  font-family:var(--font-display);font-weight:600;
  font-size:clamp(22px,2.6vw,36px);line-height:1.2;letter-spacing:-0.015em;
}
.lede{
  font-size:clamp(16px,1.5vw,19px);
  line-height:1.85;
  color:var(--muted);
  max-width:62ch;
}
.eyebrow{
  display:flex;align-items:center;gap:10px;
  margin:0 0 12px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:0.18em;
  color:var(--cyan);text-transform:uppercase;
}
.eyebrow::before{content:"";flex:none;width:24px;height:1px;background:var(--cyan);}
.divider{height:1px;background:var(--rule);border:0;margin:0;}

/* ---------- 4. 容器与网格 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{
  padding-block:clamp(40px,7vw,96px);
  border-top:var(--hair);
}
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.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;}

/* ---------- 5. 面板与卡片 ---------- */
.panel{
  position:relative;
  background:var(--panel);
  border:var(--hair);
  box-shadow:var(--shadow-panel);
  padding:clamp(18px,2.6vw,32px);
  transition:transform 200ms var(--ease),border-color 200ms var(--ease);
}
.panel--quiet{background:var(--panel-deep);box-shadow:none;}
.panel--accent{border-color:var(--cyan-dim);}
.panel--paper{
  background:var(--paper);
  color:var(--ink);
  border-color:var(--paper-line);
  box-shadow:0 2px 6px rgba(0,0,0,0.24);
}
.panel--paper a{color:#0B5A49;}
.panel--paper .mono{color:#5A5348;}
.panel--hoverable:hover{transform:translateY(-2px);border-color:var(--cyan-dim);}

/* ---------- 6. 图片容器（页面阶段放图使用） ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  border:var(--hair);
  background-color:var(--panel-deep);
  background-image:
    repeating-linear-gradient(0deg,rgba(25,240,200,0.06) 0 1px,transparent 1px 5px),
    repeating-linear-gradient(90deg,rgba(25,240,200,0.05) 0 1px,transparent 1px 5px);
}
.media > img,
.media > picture > img{
  display:block;width:100%;height:100%;
  object-fit:cover;object-position:center;
}
.media--3x4{aspect-ratio:3/4;}
.media--1x1{aspect-ratio:1/1;}
.media--4x3{aspect-ratio:4/3;}
.media--16x9{aspect-ratio:16/9;}
.media--wide{aspect-ratio:16/7;}
.media--flex{aspect-ratio:auto;height:100%;min-height:180px;}
.media--frame::after{
  content:"";position:absolute;inset:8px;
  border:1px solid rgba(25,240,200,0.22);
  pointer-events:none;
}
.media__tag{
  position:absolute;left:0;top:0;z-index:2;
  padding:4px 10px;
  background:var(--ink);
  border-right:var(--hair);
  border-bottom:var(--hair);
  font-family:var(--font-mono);font-size:12px;letter-spacing:0.08em;
  color:var(--cyan);
}

/* ---------- 7. 按钮与标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 18px;
  border:1px solid var(--rule);
  background:transparent;
  color:var(--text);
  font-family:var(--font-body);
  font-size:14px;letter-spacing:0.08em;
  text-decoration:none;cursor:pointer;
  transition:transform 140ms var(--ease),border-color 140ms ease-out,background-color 140ms ease-out,color 140ms ease-out;
}
.btn:hover{transform:translateY(-2px);border-color:var(--cyan);color:var(--cyan);}
.btn:active{transform:translateY(0);}
.btn--gold{
  background:var(--gold);color:var(--ink);
  border-color:var(--gold);font-weight:700;
}
.btn--gold:hover{background:#F7CE69;border-color:#F7CE69;color:var(--ink);}
.btn--ghost{background:transparent;}
.btn--ghost:hover{background:rgba(25,240,200,0.08);}
.btn--sm{padding:7px 13px;font-size:12px;letter-spacing:0.1em;}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;
  border:1px solid var(--rule);
  background:rgba(255,255,255,0.02);
  color:var(--muted);
  font-size:12px;letter-spacing:0.08em;
  text-decoration:none;
  transition:border-color 140ms ease-out,color 140ms ease-out;
}
.tag:hover{border-color:var(--cyan-dim);color:var(--cyan);}
.tag--violet{color:var(--violet);border-color:rgba(160,107,255,0.45);}
.tag--gold{color:var(--gold);border-color:rgba(242,193,78,0.45);}
.tag--red{color:var(--red);border-color:rgba(240,69,63,0.45);}

/* ---------- 8. 索引列表 / 面包屑 / 长文 ---------- */
.idx-list{list-style:none;margin:0;padding:0;border-top:var(--hair);}
.idx-list > li{border-bottom:var(--hair);padding:12px 0;}
.idx-list__num{
  display:inline-block;min-width:3.2ch;
  font-family:var(--font-mono);font-size:13px;letter-spacing:0.04em;
  color:var(--cyan);
}
.idx-list__note{font-size:14px;color:var(--muted);}

.crumbs{
  display:flex;flex-wrap:wrap;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:0.06em;
  color:var(--muted);
  padding:0;margin:0;list-style:none;
}
.crumbs li + li::before{content:"/";margin-right:8px;color:var(--rule);}
.crumbs a{color:var(--muted);}
.crumbs a:hover{color:var(--cyan);}

.prose{max-width:70ch;font-size:17px;line-height:1.8;}
.prose > * + *{margin-top:1.2em;}
.prose h2{
  font-size:clamp(22px,2.4vw,30px);line-height:1.3;
  margin-top:2.2em;letter-spacing:-0.01em;
}
.prose h3{font-size:18px;margin-top:1.8em;color:var(--cyan);}
.prose ul,.prose ol{padding-left:1.3em;}
.prose li{list-style:disc;margin-bottom:0.5em;}
.prose ol li{list-style:decimal;}
.prose a{
  color:var(--cyan);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:4px;
}
.prose strong{color:#fff;font-weight:700;}

/* ---------- 9. 页头 · 居中刊头导航 ---------- */
.skip-link{
  position:absolute;left:16px;top:-80px;z-index:200;
  padding:10px 16px;
  background:var(--gold);color:var(--ink);
  font-size:14px;font-weight:700;letter-spacing:0.06em;
  transition:top 120ms linear;
}
.skip-link:focus{top:12px;}

.site-head{
  position:sticky;top:0;z-index:90;
  background:linear-gradient(180deg,rgba(4,20,15,0.98),rgba(4,20,15,0.93));
  border-bottom:var(--hair);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:box-shadow 200ms var(--ease);
}
.site-head[data-stuck="true"]{box-shadow:0 6px 20px rgba(0,0,0,0.45);}

.head-inner{
  width:100%;max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(10px,1.6vw,18px) var(--gutter);
  display:grid;
  grid-template-columns:1fr auto 1fr;
  grid-template-areas:
    "util brand toggle"
    "nav  nav   nav";
  align-items:center;
  row-gap:clamp(8px,1.2vw,14px);
  transition:padding 200ms var(--ease),row-gap 200ms var(--ease);
}
.site-head[data-stuck="true"] .head-inner{padding-block:6px;row-gap:4px;}
.site-head[data-stuck="true"] .head-util{opacity:0.72;}

.head-util{
  grid-area:util;
  justify-self:start;
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:0.04em;
  color:var(--muted);
  white-space:nowrap;
  transition:opacity 200ms var(--ease);
}

.masthead{
  grid-area:brand;
  justify-self:center;
  display:flex;align-items:baseline;gap:10px;
  color:var(--text);
  text-decoration:none;
  white-space:nowrap;
}
.masthead__mark{
  font-size:clamp(18px,1.8vw,24px);
  color:var(--cyan);
  border:var(--hair);
  padding:0 6px;
  line-height:1.5;
}
.masthead__name{
  font-family:var(--font-display);
  font-size:clamp(22px,2.6vw,34px);
  font-weight:700;letter-spacing:0.02em;
  transition:font-size 200ms var(--ease);
}
.site-head[data-stuck="true"] .masthead__name{font-size:clamp(19px,2vw,26px);}
.masthead__line{
  font-size:12px;letter-spacing:0.16em;
  color:var(--muted);
  opacity:1;
  transition:opacity 200ms var(--ease);
}
.site-head[data-stuck="true"] .masthead__line{opacity:0;}
.masthead:hover .masthead__name{color:var(--cyan);}

.nav-toggle{
  grid-area:toggle;
  justify-self:end;
  display:none;align-items:center;gap:8px;
  padding:8px 12px;
  background:transparent;
  border:1px solid var(--rule);
  color:var(--text);
  font-size:13px;letter-spacing:0.12em;
  cursor:pointer;
  transition:border-color 140ms ease-out,color 140ms ease-out;
}
.nav-toggle:hover{border-color:var(--cyan-dim);color:var(--cyan);}
.nav-toggle__bars{position:relative;display:inline-block;width:16px;height:10px;flex:none;}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1px;
  background:currentColor;
  transition:top 140ms ease-out,transform 140ms ease-out;
}
.nav-toggle__bars::before{top:1px;}
.nav-toggle__bars::after{top:7px;}
.site-head[data-open="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg);}
.site-head[data-open="true"] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg);}

.site-nav{grid-area:nav;justify-self:center;}
.site-nav__list{
  display:flex;flex-wrap:wrap;justify-content:center;align-items:center;
  list-style:none;margin:0;padding:0;
}
.site-nav__list > li + li{border-left:1px solid var(--rule);}
.site-nav__list a{
  position:relative;display:block;
  padding:8px 18px;
  color:var(--muted);
  font-size:14px;letter-spacing:0.08em;
  text-decoration:none;
  transition:color 140ms ease-out;
}
.site-nav__list a::after{
  content:"";position:absolute;left:18px;right:18px;bottom:2px;height:2px;
  background:var(--cyan);
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform 140ms var(--ease);
}
.site-nav__list a:hover{color:var(--text);}
.site-nav__list a:hover::after{transform:scaleX(1);}
.site-nav__list a[aria-current="page"]{color:var(--cyan);}
.site-nav__list a[aria-current="page"]::after{transform:scaleX(1);}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 72%,var(--gold));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform 120ms linear;
  pointer-events:none;
}

/* ---------- 10. 页脚 ---------- */
.site-foot{
  margin-top:clamp(48px,8vw,104px);
  background:var(--panel-deep);
  border-top:var(--hair);
  padding-block:clamp(32px,5vw,64px) 20px;
}
.foot-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr 1.5fr;
  gap:clamp(24px,3vw,40px) var(--gap);
}
.foot-brand__mark{
  margin:0 0 8px;
  font-size:14px;
  color:var(--cyan);
  border:var(--hair);
  display:inline-block;
  padding:0 6px;
}
.foot-brand__name{
  margin:0 0 8px;
  font-family:var(--font-display);
  font-size:26px;font-weight:700;letter-spacing:0.02em;
}
.foot-brand__desc{
  margin:0 0 18px;
  font-size:13px;line-height:1.9;color:var(--muted);
}
.foot-col__title{
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:12px;font-weight:400;letter-spacing:0.18em;
  color:var(--cyan);
}
.foot-col__list{display:grid;gap:8px;}
.foot-col__list a{
  color:var(--muted);
  font-size:14px;
  transition:color 140ms ease-out,padding-left 140ms var(--ease);
}
.foot-col__list a:hover{color:var(--cyan);padding-left:4px;}
.foot-col__list--plain li{
  font-family:var(--font-mono);
  font-size:12.5px;line-height:1.75;letter-spacing:0.02em;
  color:var(--muted);
  word-break:break-word;
}
.foot-base{
  margin-top:clamp(28px,4vw,52px);
  padding-top:18px;
  border-top:var(--hair);
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;
}
.foot-base__note{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:0.04em;color:var(--muted);
}
.foot-base__year{
  margin:0;
  font-size:12px;color:var(--muted);
}
.to-top{
  margin-left:auto;
  padding:7px 14px;
  background:rgba(255,255,255,0.03);
  border:1px solid var(--rule);
  color:var(--muted);
  font-size:12px;letter-spacing:0.12em;
  cursor:pointer;
  opacity:0;visibility:hidden;
  transition:opacity 160ms var(--ease),visibility 160ms linear,border-color 140ms ease-out,color 140ms ease-out;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;}
.to-top:hover{border-color:var(--cyan);color:var(--cyan);}

/* ---------- 11. 进入视口显现 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(6px);
  transition:opacity 200ms var(--ease),transform 200ms var(--ease);
}
.js [data-reveal="shown"]{opacity:1;transform:none;}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1100px){
  .foot-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
  .foot-brand{grid-column:1 / -1;}
}
@media (max-width:960px){
  .grid{grid-template-columns:repeat(6,minmax(0,1fr));gap:18px;}
  .span-3,.span-4{grid-column:span 3;}
  .span-5,.span-6,.span-7{grid-column:span 6;}
  .span-8,.span-9,.span-12{grid-column:span 6;}
}
@media (max-width:900px){
  .head-inner{
    grid-template-columns:1fr auto;
    grid-template-areas:
      "util  toggle"
      "brand brand"
      "nav   nav";
    row-gap:10px;
  }
  .head-util{font-size:11px;overflow:hidden;text-overflow:ellipsis;}
  .nav-toggle{display:inline-flex;}
  .masthead{justify-self:center;flex-wrap:wrap;justify-content:center;}
  .masthead__line{display:none;}
  .site-nav{
    justify-self:stretch;
    max-height:0;
    overflow:hidden;
    transition:max-height 240ms var(--ease);
  }
  .site-head[data-open="true"] .site-nav{max-height:min(70vh,420px);overflow-y:auto;}
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    border-top:var(--hair);
    padding-top:6px;
  }
  .site-nav__list > li + li{border-left:0;}
  .site-nav__list a{
    padding:13px 4px;
    border-bottom:var(--hair);
    font-size:15px;
  }
  .site-nav__list a::after{display:none;}
  .site-nav__list a[aria-current="page"]{
    background:linear-gradient(90deg,rgba(25,240,200,0.14),transparent 70%);
    padding-left:12px;
  }
}
@media (max-width:680px){
  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .foot-col--wide{grid-column:1 / -1;}
  .foot-brand__name{font-size:22px;}
  .to-top{margin-left:0;}
}
@media (max-width:640px){
  .grid{grid-template-columns:minmax(0,1fr);gap:16px;}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-12{grid-column:1 / -1;}
  body{font-size:16px;}
  .prose{font-size:16px;}
}
@media (max-width:420px){
  .foot-grid{grid-template-columns:minmax(0,1fr);}
  .site-nav__list a{padding:12px 2px;}
}

/* ---------- 13. 动效尊重与打印 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    transition-duration:0.01ms !important;
    animation-duration:0.01ms !important;
    animation-iteration-count:1 !important;
    scroll-behavior:auto !important;
  }
  .btn:hover,.panel--hoverable:hover{transform:none;}
  .site-nav__list a:hover{padding-left:0;}
  .js [data-reveal]{opacity:1;transform:none;}
  .scroll-progress{transition:none;}
  .to-top{transition:border-color 140ms ease-out,color 140ms ease-out;}
}
@media print{
  .site-head,.site-foot,.to-top,.scroll-progress{display:none !important;}
  body{background:#fff;color:#111;}
}