/* ==========================================================================
   家乐棋牌电玩 · jiale-chess.com.cn
   共享样式表 /assets/site.css
   1 重置 · 2 令牌 · 3 排版 · 4 布局 · 5 索引标签 · 6 按钮 · 7 面包屑
   8 图形容器 · 9 品牌轨道 · 10 刊头与导航 · 11 页脚 · 12 动效 · 13 可访问性
   ========================================================================== */

/* 1 · 重置 ---------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dt,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
hr{border:0;height:1px;background:rgba(76,84,94,.22)}

/* 2 · 设计令牌 ------------------------------------------------------------ */
:root{
  --lapis:#17386B;
  --lapis-lift:#1E477E;
  --night:#0C1F3D;
  --gold:#E7B44C;
  --gold-deep:#9E6F18;
  --ochre:#B4452C;
  --turq:#2C8C7D;
  --turq-deep:#1F6B60;
  --ivory:#F7F1E4;
  --mist:#DFE6F0;
  --stone:#4C545E;
  --moss:#6D7A52;
  --clay:#C67C5B;
  --ink:#111820;

  --font-display:"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","SimSun",Georgia,serif;
  --font-body:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --wrap:1240px;
  --wrap-wide:1460px;
  --wrap-narrow:760px;
  --gutter:24px;
  --rail-w:96px;
  --rail-w-xl:240px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:280ms;
  --dur-slow:480ms;

  --hairline:rgba(76,84,94,.22);
  --hairline-light:rgba(247,241,228,.18);
}

/* 3 · 基础排版 ------------------------------------------------------------ */
body{
  background:var(--ivory);
  color:var(--stone);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.8;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
@media (min-width:1080px){body{padding-left:var(--rail-w)}}
@media (min-width:1520px){body{padding-left:var(--rail-w-xl)}}

h1,h2,h3{font-family:var(--font-display);font-weight:500;color:var(--lapis);line-height:1.18;letter-spacing:.01em}
h4,h5,h6{font-family:var(--font-body);font-weight:600;color:var(--ink);line-height:1.45;letter-spacing:.02em}
p{text-wrap:pretty}
strong{font-weight:600;color:var(--ink)}
em{font-style:normal;color:var(--lapis)}
::selection{background:var(--gold);color:var(--night)}

.display--xl{font-family:var(--font-display);font-weight:500;font-size:clamp(46px,8.4vw,128px);line-height:.98;letter-spacing:.005em;color:var(--lapis)}
.display--lg{font-family:var(--font-display);font-weight:500;font-size:clamp(34px,5.4vw,72px);line-height:1.06;letter-spacing:.01em;color:var(--lapis)}
.display--md{font-family:var(--font-display);font-weight:500;font-size:clamp(26px,3.4vw,44px);line-height:1.16;letter-spacing:.01em;color:var(--lapis)}
.display--sm{font-family:var(--font-display);font-weight:500;font-size:clamp(20px,2.2vw,28px);line-height:1.3;letter-spacing:.01em;color:var(--lapis)}

.lede{font-size:clamp(18px,1.5vw,21px);line-height:1.75;color:#2E3742;max-width:34em}

.prose{max-width:42em;font-size:17px;line-height:1.82;color:var(--stone)}
.prose > * + *{margin-top:1.05em}
.prose h2{margin-top:1.8em;font-size:clamp(22px,2.6vw,32px)}
.prose h3{margin-top:1.7em;font-size:clamp(19px,1.9vw,24px)}
.prose h4{margin-top:1.5em}
.prose ul,.prose ol{margin-top:1.05em}
.prose ul li{position:relative;padding-left:1.1em}
.prose ul li + li{margin-top:.55em}
.prose ul li::before{content:"";position:absolute;left:0;top:.86em;width:8px;height:1px;background:var(--gold-deep)}
.prose ol{list-style:none;counter-reset:prose-ol}
.prose ol li{position:relative;padding-left:2em;counter-increment:prose-ol}
.prose ol li + li{margin-top:.55em}
.prose ol li::before{content:counter(prose-ol,decimal-leading-zero);position:absolute;left:0;top:.1em;font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--gold-deep)}
.prose a{border-bottom:1px solid var(--gold);color:var(--lapis)}
.prose a:hover{background:rgba(231,180,76,.2)}

/* 4 · 布局容器 ------------------------------------------------------------ */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter)}
.wrap--wide{max-width:var(--wrap-wide)}
.wrap--narrow{max-width:var(--wrap-narrow)}

.section{padding:96px 0}
.section--tight{padding:48px 0}
.section--flush-top{padding-top:0}
.section--flush-bottom{padding-bottom:0}
.section--ivory{background:var(--ivory)}
.section--mist{background:var(--mist)}
.section--lapis{background:var(--lapis);color:rgba(247,241,228,.84)}
.section--night{background:linear-gradient(180deg,var(--night) 0%,#122C52 100%);color:rgba(247,241,228,.84)}
.section--lapis h1,.section--lapis h2,.section--lapis h3,
.section--night h1,.section--night h2,.section--night h3{color:var(--ivory)}
.section--lapis .prose,.section--night .prose{color:rgba(247,241,228,.78)}
.section--lapis .lede,.section--night .lede{color:rgba(247,241,228,.8)}
.section--lapis a,.section--night a{color:var(--gold)}

.grid{display:grid;gap:24px}
.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))}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--gap-lg{gap:48px}

.stack > * + *{margin-top:24px}
.stack--lg > * + *{margin-top:48px}
.list-plain li + li{margin-top:14px}

.rule{height:1px;background:var(--hairline)}
.rule--light{background:var(--hairline-light)}
.rule--gold{background:linear-gradient(90deg,transparent,rgba(231,180,76,.75),transparent)}
.band{height:8px;background:linear-gradient(90deg,var(--lapis) 0%,var(--turq) 24%,var(--moss) 44%,var(--gold) 66%,var(--ochre) 84%,var(--clay) 100%)}

/* 5 · 索引与标签 ---------------------------------------------------------- */
.index{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--stone);font-variant-numeric:tabular-nums}
.index--gold{color:var(--gold-deep)}
.index--light{color:rgba(247,241,228,.62)}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}

.tag{display:inline-block;padding:3px 10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;line-height:1.7;border:1px solid currentColor;color:var(--lapis)}
.tag--gold{color:var(--gold-deep)}
.tag--ochre{color:var(--ochre)}
.tag--turq{color:var(--turq-deep)}
.tag--moss{color:var(--moss)}

/* 6 · 按钮 ---------------------------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;
  font-size:14px;letter-spacing:.1em;line-height:1.2;
  border:1px solid transparent;
  text-align:center;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--gold{background:var(--gold);border-color:var(--gold);color:#241A05}
.btn--gold:hover{background:#F0C468;border-color:#F0C468}
.btn--ghost{border-color:rgba(247,241,228,.42);color:var(--ivory)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn--ink{background:var(--lapis);border-color:var(--lapis);color:var(--ivory)}
.btn--ink:hover{background:var(--lapis-lift);border-color:var(--lapis-lift)}
.btn--outline{border-color:var(--lapis);color:var(--lapis);background:transparent}
.btn--outline:hover{background:var(--lapis);color:var(--ivory)}
.btn--sm{padding:9px 18px;font-size:13px}

/* 7 · 面包屑 -------------------------------------------------------------- */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--stone)}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"/";color:rgba(76,84,94,.42)}
.crumbs a{border-bottom:1px solid transparent;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.crumbs a:hover{color:var(--lapis);border-bottom-color:var(--gold)}
.crumbs [aria-current="page"]{color:var(--lapis)}

/* 8 · 图形容器 ------------------------------------------------------------ */
.figure{margin:0}
.figure__frame{
  position:relative;
  aspect-ratio:16 / 10;
  background:linear-gradient(135deg,#E6EBF3 0%,#D6DEEA 100%);
  border:1px solid var(--hairline);
  overflow:hidden;
}
.figure__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(135deg,rgba(23,56,107,.055) 0 1px,transparent 1px 11px);
}
.figure__frame img{width:100%;height:100%;object-fit:cover}
.figure__cap{margin-top:12px;font-size:14px;line-height:1.7;color:var(--stone)}
.figure__cap b{font-weight:500;color:var(--lapis)}
.figure--wide .figure__frame{aspect-ratio:21 / 9}
.figure--panorama .figure__frame{aspect-ratio:32 / 9}
.figure--square .figure__frame{aspect-ratio:1 / 1}
.figure--tall .figure__frame{aspect-ratio:4 / 5}

/* 平板对照基础结构 */
.compare-shell{position:relative;padding-top:44px}
.compare{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;align-items:start}
.compare[data-stack]{grid-template-columns:minmax(0,1fr)}
.compare__toggle{position:absolute;top:0;right:0}

/* 9 · 品牌轨道 ------------------------------------------------------------ */
.rail{display:none}
@media (min-width:1080px){
  .rail{
    display:flex;flex-direction:column;align-items:center;justify-content:space-between;
    position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);
    padding:26px 0 22px;
    background:linear-gradient(180deg,#0A1B35 0%,var(--night) 58%,#122C52 100%);
    border-right:1px solid rgba(231,180,76,.2);
    z-index:60;
  }
}
@media (min-width:1520px){.rail{width:var(--rail-w-xl)}}

.rail__mark{writing-mode:vertical-rl;font-family:var(--font-display);font-weight:500;font-size:17px;line-height:1;letter-spacing:.42em;color:var(--gold);text-indent:.42em}
@media (min-width:1520px){.rail__mark{font-size:24px;letter-spacing:.56em;text-indent:.56em}}

.rail__progress{position:relative;flex:1 1 auto;width:1px;margin:22px 0;background:rgba(247,241,228,.16);overflow:hidden}
.rail__fill{position:absolute;top:0;left:0;width:100%;height:0;background:linear-gradient(180deg,var(--turq) 0%,var(--gold) 100%);transition:height 160ms linear}

.rail__chapter{display:flex;flex-direction:column;align-items:center;gap:10px}
.rail__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--gold);font-variant-numeric:tabular-nums}
.rail__name{writing-mode:vertical-rl;font-size:12px;letter-spacing:.26em;color:rgba(247,241,228,.66);max-height:9em;overflow:hidden;text-indent:.26em}
@media (min-width:1520px){.rail__name{font-size:13px}}

.rail__top{
  margin-top:18px;width:36px;height:36px;
  display:grid;place-items:center;
  font-size:12px;letter-spacing:.06em;color:var(--ivory);
  border:1px solid rgba(247,241,228,.28);
  opacity:0;visibility:hidden;
  transition:opacity var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.rail__top[data-visible]{opacity:1;visibility:visible}
.rail__top:hover{border-color:var(--gold);background:var(--gold);color:var(--night)}

/* 10 · 刊头与导航 --------------------------------------------------------- */
.site-header{
  position:relative;z-index:40;
  padding:34px 0 0;
  background:radial-gradient(130% 150% at 50% -10%,#1F4A85 0%,var(--lapis) 48%,#10294F 100%);
  color:var(--ivory);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(231,180,76,.7),transparent);
}

.masthead{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter);text-align:center}
.masthead__eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.3em;text-indent:.3em;color:rgba(231,180,76,.86)}
.masthead__brand{
  display:block;margin-top:18px;
  font-family:var(--font-display);font-weight:500;
  font-size:clamp(40px,7.6vw,108px);line-height:1;letter-spacing:.04em;text-indent:.04em;
  color:var(--ivory);
  transition:color var(--dur) var(--ease);
}
.masthead__brand::after{
  content:"";display:block;width:76px;height:1px;margin:24px auto 0;
  background:linear-gradient(90deg,transparent,var(--gold),transparent);
}
.masthead__brand:hover{color:var(--gold)}
.masthead__tagline{margin-top:16px;font-size:15px;line-height:1.8;letter-spacing:.04em;color:rgba(247,241,228,.66)}
.masthead__actions{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-top:30px}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  margin:24px auto 0;padding:11px 20px;
  font-size:13px;letter-spacing:.16em;color:var(--ivory);
  border:1px solid rgba(247,241,228,.34);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);color:var(--gold)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:space-between;width:16px;height:10px}
.nav-toggle__bars i{display:block;height:1px;background:currentColor;transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}
.nav-toggle__text{line-height:1}

.site-nav{position:relative}
.site-nav__list{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:6px 34px;padding:26px 0 22px}
.site-nav__link{
  position:relative;display:inline-block;padding:6px 0;
  font-size:13px;letter-spacing:.14em;
  color:rgba(247,241,228,.78);
  transition:color var(--dur) var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:var(--gold);transform:scaleX(0);transform-origin:50% 50%;
  transition:transform .3s var(--ease);
}
.site-nav__link:hover{color:var(--ivory)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--gold)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* 11 · 页脚 --------------------------------------------------------------- */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,var(--night) 0%,#122C52 62%,#17386B 100%);
  color:rgba(247,241,228,.82);
  padding-bottom:32px;
}
.footer__inner{
  display:grid;grid-template-columns:minmax(280px,1.05fr) 1.7fr;
  gap:64px;padding-top:72px;padding-bottom:56px;
}
.footer__name{font-family:var(--font-display);font-weight:500;font-size:clamp(28px,3vw,40px);line-height:1.2;letter-spacing:.04em;color:var(--ivory)}
.footer__line{margin-top:16px;max-width:30em;font-size:15px;line-height:1.8;color:rgba(247,241,228,.7)}
.footer__contact{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;
  margin-top:24px;font-family:var(--font-mono);font-size:14px;letter-spacing:.02em;color:var(--gold);
}
.footer__dot{color:rgba(247,241,228,.35)}
.footer__addr{margin-top:8px;font-size:14px;color:rgba(247,241,228,.6)}

.footer__nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}
.footer__col-title{margin-bottom:18px;font-family:var(--font-mono);font-weight:400;font-size:12px;letter-spacing:.14em;color:var(--gold)}
.footer__list li + li{margin-top:12px}
.footer__list a{
  font-size:15px;color:rgba(247,241,228,.76);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer__list a:hover{color:var(--ivory);border-bottom-color:var(--gold)}

.footer__base{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 28px;
  padding-top:24px;border-top:1px solid rgba(247,241,228,.14);
}
.footer__copy,.footer__icp{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:rgba(247,241,228,.52)}

/* 12 · 动效与显现 --------------------------------------------------------- */
html[data-js="on"] [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
html[data-js="on"] [data-reveal][data-revealed]{opacity:1;transform:none}

/* 13 · 可访问性与响应式 --------------------------------------------------- */
.skip-link{
  position:fixed;top:-100px;left:16px;z-index:300;
  padding:12px 22px;
  font-size:14px;letter-spacing:.1em;
  background:var(--gold);color:var(--night);
  transition:top 200ms var(--ease);
}
.skip-link:focus{top:16px}

:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
.rail__top:focus-visible{outline-color:var(--gold);box-shadow:0 0 0 2px var(--night)}

@media (max-width:1100px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .section{padding:64px 0}
  .section--tight{padding:36px 0}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .grid--gap-lg{gap:32px}
  .compare{grid-template-columns:minmax(0,1fr)}

  .site-header{padding-top:22px}
  .masthead__eyebrow{font-size:11px;letter-spacing:.22em;text-indent:.22em}
  .masthead__brand{font-size:clamp(32px,10.6vw,48px);margin-top:14px}
  .masthead__brand::after{width:56px;margin-top:18px}
  .masthead__tagline{font-size:14px;margin-top:12px}
  .masthead__actions{flex-direction:column;align-items:stretch;gap:10px;margin-top:22px}
  .masthead__actions .btn{width:100%}

  .nav-toggle{display:inline-flex}

  .site-nav{overflow:hidden;max-height:0;transition:max-height var(--dur-slow) var(--ease)}
  .site-nav[data-open]{max-height:560px}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;padding:4px 0 18px}
  .site-nav__list li{border-top:1px solid var(--hairline-light)}
  .site-nav__link{display:block;padding:15px 2px;text-align:left;font-size:15px;letter-spacing:.1em}
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]::before{content:"";display:inline-block;width:14px;height:1px;margin-right:10px;vertical-align:middle;background:var(--gold)}

  .footer__inner{grid-template-columns:minmax(0,1fr);gap:44px;padding-top:48px;padding-bottom:36px}
  .footer__nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
}
@media (max-width:560px){
  .footer__nav{grid-template-columns:minmax(0,1fr);gap:24px}
  .footer__base{flex-direction:column;align-items:flex-start}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html[data-js="on"] [data-reveal]{opacity:1;transform:none}
  .rail__fill{transition:none}
}