/* ============================================================
   /assets/site.css — 至尊棋牌2026 全站共享样式
   01 设计令牌 / 02 重置与中文排版 / 03 无障碍 / 04 布局
   05 通用组件 / 06 头部 / 07 页脚 / 08 响应式 / 09 动效偏好
   ============================================================ */

/* ---------- 01 设计令牌 ---------- */
:root{
  --paper:#F6F0E3;
  --paper-2:#EFE6D4;
  --paper-3:#FBF6EC;
  --ink:#1B1A17;
  --ink-soft:#3A3731;
  --red:#B3261E;
  --red-deep:#8C1D17;
  --gold:#C9A24B;
  --gold-deep:#A9863A;
  --indigo:#233B68;
  --green:#1E4A3D;
  --butter:#E8C66E;
  --stone:#8A8274;
  --night:#101827;
  --blush:#E9B9A9;

  --line:rgba(27,26,23,.14);
  --line-soft:rgba(27,26,23,.08);
  --line-gold:rgba(201,162,75,.55);

  --font-display:"Noto Serif SC","Songti SC",STSong,"Source Han Serif SC",serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --content:1180px;
  --gutter:clamp(1rem,4vw,3.5rem);
  --header-h:84px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:320ms;
  --shadow-card:0 1px 0 rgba(27,26,23,.05), 0 20px 40px -32px rgba(27,26,23,.7);
}

/* ---------- 02 重置与中文排版 ---------- */
*,*::before,*::after{box-sizing:border-box;}

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

body{
  margin:0;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  font-weight:400;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 10% 6%, rgba(201,162,75,.13), transparent 44%),
    radial-gradient(circle at 92% 0%, rgba(35,59,104,.09), transparent 48%),
    linear-gradient(180deg, rgba(233,185,169,.10), transparent 30%);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body,h1,h2,h3,h4,h5,h6,p,ul,ol,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}

h1,h2,h3,h4{
  font-family:var(--font-display);
  line-height:1.22;
  font-weight:600;
  letter-spacing:.015em;
  color:var(--ink);
}
h1{font-weight:300;font-size:clamp(2.4rem,4.5vw,4.8rem);letter-spacing:.01em;}
h2{font-size:clamp(1.5rem,2.4vw,2rem);}
h3{font-size:1.16rem;font-weight:600;}
h4{font-size:1rem;font-weight:600;letter-spacing:.06em;}

p{max-width:none;}

a{color:var(--indigo);text-decoration:none;}
a:hover{color:var(--red);}

img,svg,video{display:block;max-width:100%;}
img{height:auto;}

code,kbd,samp,pre{font-family:var(--font-mono);font-size:.92em;}

strong{font-weight:600;color:var(--ink);}

hr{border:0;border-top:1px solid var(--line);margin:clamp(28px,4vw,52px) 0;}

::selection{background:var(--blush);color:var(--ink);}

[id]{scroll-margin-top:calc(var(--header-h) + 24px);}

/* ---------- 03 无障碍 ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  transform:translateY(-180%);
  padding:11px 18px;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  border:1px solid var(--gold);
  transition:transform 180ms var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--butter);}

:where(a,button,[tabindex]):focus-visible{
  outline:2px solid var(--red);
  outline-offset:3px;
  border-radius:1px;
}
.site-footer :where(a,button):focus-visible{outline-color:var(--butter);}

.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;
}

/* ---------- 04 布局 ---------- */
.container{
  width:min(100% - var(--gutter) * 2, var(--content));
  margin-inline:auto;
}
.container--narrow{
  width:min(100% - var(--gutter) * 2, 760px);
  margin-inline:auto;
}

.stack{display:flex;flex-direction:column;gap:var(--stack-gap, clamp(14px,1.8vw,24px));}

.grid{display:grid;gap:clamp(16px,2.4vw,32px);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));}

/* ---------- 05 通用组件 ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--ink);
  --btn-bd:var(--line-gold);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:500;
  line-height:1.4;
  letter-spacing:.08em;
  color:var(--btn-fg);
  background:var(--btn-bg);
  border:1px solid var(--btn-bd);
  text-decoration:none;
  cursor:pointer;
  transition:transform var(--dur) var(--ease),
             background-color 180ms linear,
             border-color 180ms linear,
             color 180ms linear,
             box-shadow var(--dur) var(--ease);
}
.btn:hover{
  transform:translateY(-2px);
  box-shadow:0 12px 24px -18px rgba(27,26,23,.85);
}
.btn:active{transform:translateY(0);box-shadow:none;}

.btn--solid{--btn-bg:var(--red);--btn-fg:#FBF6EC;--btn-bd:var(--red-deep);}
.btn--solid:hover{--btn-bg:var(--red-deep);color:#FBF6EC;}

.btn--ghost{--btn-bg:transparent;--btn-fg:var(--indigo);--btn-bd:rgba(35,59,104,.42);}
.btn--ghost:hover{--btn-bg:rgba(35,59,104,.07);--btn-bd:var(--indigo);color:var(--indigo);}

.btn--gold{--btn-bg:var(--gold);--btn-fg:#241E12;--btn-bd:var(--gold-deep);}
.btn--gold:hover{--btn-bg:var(--butter);color:#241E12;}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  line-height:1.7;
  color:var(--indigo);
  background:rgba(35,59,104,.06);
  border:1px solid currentColor;
}
.tag--red{color:var(--red);background:rgba(179,38,30,.07);}
.tag--gold{color:#8A6A1F;background:rgba(232,198,110,.24);}
.tag--green{color:var(--green);background:rgba(30,74,61,.08);}

.card{
  position:relative;
  padding:clamp(18px,2.4vw,30px);
  background:var(--paper-3);
  border:1px solid var(--line);
  box-shadow:var(--shadow-card);
  transition:transform var(--dur) var(--ease),
             border-color var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease);
}
.card:hover{
  transform:translateY(-4px);
  border-color:var(--line-gold);
  box-shadow:0 1px 0 rgba(27,26,23,.05), 0 28px 46px -32px rgba(27,26,23,.72);
}
.card--stack{
  box-shadow:
    5px 5px 0 -1px var(--paper-2),
    5px 5px 0 0 var(--line-gold),
    var(--shadow-card);
}

.section-head{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin-bottom:clamp(20px,3vw,36px);
}
.section-index{
  display:inline-flex;
  align-items:center;
  gap:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.3em;
  color:var(--red);
  text-transform:uppercase;
}
.section-index::after{
  content:"";
  display:block;
  width:56px;
  height:1px;
  background:var(--gold);
}
.section-title{font-family:var(--font-display);}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--stone);
}
.breadcrumb a{
  color:var(--indigo);
  border-bottom:1px solid rgba(35,59,104,.3);
  transition:color 160ms linear, border-color 160ms linear;
}
.breadcrumb a:hover{color:var(--red);border-bottom-color:var(--red);}
.breadcrumb__sep{color:var(--gold);}
.breadcrumb [aria-current="page"]{color:var(--ink);}

.prose{
  max-width:68ch;
  font-size:17px;
  line-height:1.9;
  color:var(--ink-soft);
}
.prose > * + *{margin-top:1.05em;}
.prose h2,.prose h3{color:var(--ink);margin-top:1.6em;}
.prose ul,.prose ol{padding-left:1.35em;list-style:revert;}
.prose li + li{margin-top:.4em;}
.prose a{border-bottom:1px solid rgba(35,59,104,.34);}
.prose a:hover{border-bottom-color:var(--red);}

.data-table{
  width:100%;
  border-collapse:collapse;
  font-family:var(--font-mono);
  font-size:14px;
  font-variant-numeric:tabular-nums;
}
.data-table th{
  padding:10px 12px;
  text-align:left;
  font-family:var(--font-body);
  font-size:12px;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--stone);
  border-bottom:1px solid var(--gold);
  white-space:nowrap;
}
.data-table td{
  padding:10px 12px;
  border-bottom:1px solid var(--line-soft);
  color:var(--ink-soft);
}
.data-table tbody tr{transition:background-color 160ms linear;}
.data-table tbody tr:hover{background:rgba(233,185,169,.26);}

.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 10;
  background:var(--paper-2);
  border:1px solid var(--line);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  margin:7px;
  border:1px solid var(--line-gold);
  pointer-events:none;
}
.media-frame--portrait{aspect-ratio:3 / 4;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame--wide{aspect-ratio:21 / 9;}

/* ---------- 06 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  background:var(--paper);
  border-bottom:1px solid var(--line-gold);
  box-shadow:0 18px 30px -28px rgba(16,24,39,.85);
}

.site-header__edge{
  height:9px;
  background-color:var(--indigo);
  background-image:repeating-linear-gradient(
    90deg,
    var(--gold) 0 2px,
    transparent 2px 28px
  );
}

.site-header__bar{
  position:relative;
  background:linear-gradient(180deg,#FCF8EF 0%, var(--paper) 88%, var(--paper-2) 100%);
}

.site-header__inner{
  width:min(100% - var(--gutter) * 2, var(--content));
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.8vw,26px);
  padding-block:12px;
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  color:var(--ink);
  text-decoration:none;
}
.brand:hover{color:var(--ink);}

.brand__seal{
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  flex:0 0 auto;
  font-family:var(--font-display);
  font-size:17px;
  font-weight:600;
  line-height:1;
  letter-spacing:.04em;
  color:var(--paper);
  background:linear-gradient(145deg,var(--red) 0%, var(--red-deep) 100%);
  border:1px solid var(--gold);
  box-shadow:inset 0 0 0 2px rgba(246,240,227,.24);
  transition:box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.brand:hover .brand__seal{
  transform:rotate(-2deg);
  box-shadow:inset 0 0 0 2px rgba(246,240,227,.42);
}

.brand__text{display:flex;flex-direction:column;gap:3px;}

.brand__name{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:600;
  letter-spacing:.1em;
  line-height:1.15;
  color:var(--ink);
}

.brand__tagline{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  line-height:1.4;
  color:var(--stone);
  white-space:nowrap;
}

.header-meta{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}

.version-badge{
  display:inline-block;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  line-height:1.6;
  color:var(--butter);
  background:var(--indigo);
  border:1px solid var(--gold);
  white-space:nowrap;
}

.header-index{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  color:var(--gold-deep);
  white-space:nowrap;
}

.site-nav{margin-inline-start:auto;}

.site-nav__list{
  display:flex;
  align-items:center;
  gap:clamp(2px,.6vw,10px);
}

.site-nav__item{position:relative;}

.site-nav__link{
  position:relative;
  display:inline-block;
  padding:8px clamp(6px,.8vw,12px);
  font-family:var(--font-body);
  font-size:14.5px;
  letter-spacing:.06em;
  line-height:1.5;
  color:var(--ink);
  white-space:nowrap;
  transition:color 180ms linear;
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:clamp(6px,.8vw,12px);
  right:clamp(6px,.8vw,12px);
  bottom:3px;
  height:1px;
  background:var(--gold);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.site-nav__link:hover{color:var(--red);}
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after{transform:scaleX(1);}

.site-nav__link[aria-current="page"]{color:var(--red);}
.site-nav__link[aria-current="page"]::after{
  transform:scaleX(1);
  background:var(--red);
  height:2px;
}

.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.header-actions .btn{padding:10px 16px;font-size:13.5px;letter-spacing:.06em;}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  margin-inline-start:auto;
  padding:10px 12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--indigo);
  background:transparent;
  border:1px solid rgba(35,59,104,.5);
  cursor:pointer;
  transition:background-color 180ms linear, border-color 180ms linear;
}
.nav-toggle:hover{background:rgba(35,59,104,.07);border-color:var(--indigo);}

.nav-toggle__bars{display:grid;gap:4px;width:18px;}
.nav-toggle__bars span{
  display:block;
  height:1.5px;
  background:currentColor;
  transition:transform var(--dur) var(--ease), opacity 160ms linear;
}
.site-header[data-nav-open="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg);}
.site-header[data-nav-open="true"] .nav-toggle__bars span:nth-child(2){opacity:0;}
.site-header[data-nav-open="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg);}

.nav-toggle__label{line-height:1;}

.scroll-progress{
  position:absolute;
  left:0;
  bottom:0;
  height:2px;
  width:0;
  z-index:2;
  background:linear-gradient(90deg,var(--red) 0%, var(--gold) 62%, var(--butter) 100%);
  transition:width 90ms linear;
}

/* ---------- 07 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  color:rgba(246,240,227,.82);
  background-color:var(--night);
  background-image:
    radial-gradient(circle at 8% 0%, rgba(35,59,104,.85), transparent 52%),
    radial-gradient(circle at 92% 12%, rgba(30,74,61,.75), transparent 50%),
    linear-gradient(180deg, var(--night) 0%, #0C1320 100%);
  font-size:15px;
}

.site-footer__stripe{
  height:8px;
  background-color:var(--red);
  background-image:repeating-linear-gradient(
    90deg,
    var(--gold) 0 2px,
    transparent 2px 28px
  );
}

.site-footer__inner{
  width:min(100% - var(--gutter) * 2, var(--content));
  margin-inline:auto;
  display:grid;
  grid-template-columns:1.4fr .8fr .8fr 1.15fr;
  gap:clamp(26px,3.4vw,58px);
  padding-block:clamp(38px,5vw,64px);
}

.site-footer__brand{display:flex;flex-direction:column;gap:10px;}

.site-footer__name{
  font-family:var(--font-display);
  font-size:22px;
  font-weight:600;
  letter-spacing:.12em;
  line-height:1.3;
  color:var(--paper);
  border-bottom:1px solid transparent;
  width:fit-content;
  transition:color 180ms linear, border-color 180ms linear;
}
.site-footer__name:hover{color:var(--butter);border-bottom-color:var(--gold);}

.site-footer__tagline{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  color:var(--gold);
}

.site-footer__summary{
  max-width:32ch;
  font-size:14px;
  line-height:1.8;
  color:rgba(246,240,227,.7);
}

.site-footer__badge{
  display:inline-block;
  width:fit-content;
  margin-top:4px;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--butter);
  border:1px solid rgba(201,162,75,.55);
}

.footer-col{display:flex;flex-direction:column;gap:12px;}

.footer-col__heading{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  line-height:1.6;
  color:var(--gold);
}

.footer-col__list{display:grid;gap:9px;}

.footer-col__link{
  display:inline-block;
  width:fit-content;
  font-size:14.5px;
  line-height:1.7;
  color:rgba(246,240,227,.78);
  border-bottom:1px solid transparent;
  transition:color 180ms linear, border-color 180ms linear, transform 180ms var(--ease);
}
.footer-col__link:hover{
  color:var(--butter);
  border-bottom-color:var(--gold);
  transform:translateX(2px);
}

.footer-contact{display:flex;flex-direction:column;gap:12px;}

.footer-contact__list{display:grid;gap:10px;}

.footer-contact__item{display:grid;gap:1px;}

.footer-contact__label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  line-height:1.6;
  color:rgba(201,162,75,.82);
}

.footer-contact__value{
  font-family:var(--font-mono);
  font-size:13.5px;
  line-height:1.7;
  letter-spacing:.02em;
  color:rgba(246,240,227,.9);
  word-break:break-word;
}

.footer-contact__note{
  margin-top:4px;
  font-size:12.5px;
  line-height:1.8;
  color:rgba(246,240,227,.55);
}

.site-footer__legal{
  border-top:1px solid rgba(201,162,75,.3);
  background:rgba(9,14,23,.6);
}

.site-footer__legal-inner{
  width:min(100% - var(--gutter) * 2, var(--content));
  margin-inline:auto;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
  padding-block:18px;
}

.site-footer__legal-item{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  line-height:1.8;
  color:rgba(246,240,227,.6);
}

/* ---------- 08 响应式 ---------- */
@media (max-width:1140px){
  .nav-toggle{display:inline-flex;}
  .header-actions .btn--ghost{display:none;}

  .site-nav{
    position:fixed;
    top:var(--header-h);
    left:0;
    right:0;
    width:100%;
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    margin-inline-start:0;
    padding:10px clamp(16px,5vw,40px) 26px;
    background:linear-gradient(180deg,var(--paper-3) 0%, var(--paper) 100%);
    border-bottom:2px solid var(--gold);
    box-shadow:0 36px 52px -34px rgba(16,24,39,.8);
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transform:translateY(-10px);
    transition:opacity 200ms linear,
               transform var(--dur) var(--ease),
               visibility 0s linear var(--dur);
    z-index:85;
  }
  .site-nav[data-open="true"]{
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transform:translateY(0);
    transition:opacity 200ms linear,
               transform var(--dur) var(--ease),
               visibility 0s linear 0s;
  }

  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;margin-top:8px;}
  .site-nav__item + .site-nav__item{border-top:1px solid var(--line-soft);}
  .site-nav__link{
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:15px 4px;
    font-size:16.5px;
  }
  .site-nav__link::after{left:4px;right:4px;bottom:9px;}

  .site-footer__inner{grid-template-columns:1fr 1fr;}
  .site-footer__brand{grid-column:1 / -1;}
  .site-footer__summary{max-width:46ch;}
}

@media (max-width:900px){
  .header-index{display:none;}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:720px){
  body{font-size:16.5px;}
  .brand__tagline{display:none;}
  .brand__name{font-size:17px;letter-spacing:.06em;}
  .brand__seal{width:42px;height:42px;font-size:15.5px;}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr);}
  .site-footer__inner{grid-template-columns:minmax(0,1fr);}
  .site-footer__legal-inner{justify-content:flex-start;}
}

@media (max-width:560px){
  :root{--gutter:1rem;}
  .version-badge{display:none;}
  .header-actions .btn--solid{
    padding:8px 11px;
    font-size:12.5px;
    letter-spacing:.02em;
  }
  .brand{gap:9px;}
  .nav-toggle{padding:9px 10px;letter-spacing:.12em;}
  .media-frame--wide{aspect-ratio:16 / 9;}
}

@media (max-width:400px){
  .nav-toggle__label{display:none;}
  .brand__name{font-size:15.5px;}
}

/* ---------- 09 动效偏好 ---------- */
[data-reveal]{
  transition:opacity 460ms var(--ease), transform 460ms var(--ease);
}
[data-reveal].is-hidden{
  opacity:0;
  transform:translateY(16px);
}
[data-reveal].is-visible{
  opacity:1;
  transform:none;
}

@media (prefers-reduced-motion: reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  [data-reveal],
  [data-reveal].is-hidden{
    opacity:1!important;
    transform:none!important;
  }
  .card:hover,
  .btn:hover{transform:none;}
}

@media print{
  .site-header,.site-footer,.scroll-progress{display:none!important;}
  body{background:#FFFFFF;color:#000000;}
}