/* ============================================================
   63棋牌电玩 · 共享样式 /assets/site.css
   雪青纸底 + 胡杨金索引 + 墨青收束
   ============================================================ */

/* ---------- 1. RESET ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,time{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,picture{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:var(--cyan);text-decoration-thickness:1px;text-underline-offset:3px}
table{border-collapse:collapse;width:100%}

/* ---------- 2. TOKENS ---------- */
:root{
  --paper:#F2F6F7;
  --band:#E3EDEF;
  --line:#B9CFD4;
  --cyan:#3F7E88;
  --deep:#24555C;
  --ink:#16333A;
  --gold:#C08A2A;
  --gold-soft:#EFD9A3;
  --grape:#6B4A7C;
  --clay:#A9553F;
  --clay-light:#E4A391;
  --glass:rgba(255,255,255,0.66);
  --paper-solid:#FFFFFF;

  --shell-w:1180px;
  --pad:clamp(18px,4vw,40px);

  --font-display:"Songti SC","Noto Serif SC","Source Han Serif SC",serif;
  --font-body:"PingFang SC","Noto Sans SC","Hiragino Sans GB",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,monospace;

  --ease:cubic-bezier(0.22,0.61,0.36,1);
  --dur:380ms;
  --stagger:70ms;
}

/* ---------- 3. BASE ---------- */
body{
  background-color:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  letter-spacing:0.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:var(--gold-soft);color:var(--ink)}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.26;
  letter-spacing:0.02em;
  color:var(--deep);
}
h1{font-size:clamp(2.2rem,5.4vw,4.4rem);font-weight:900;margin-bottom:0.45em}
h2{font-size:clamp(1.55rem,3vw,2.3rem);margin-bottom:0.5em}
h3{font-size:clamp(1.15rem,1.8vw,1.4rem);margin-bottom:0.5em}
h4{font-size:1.05rem;margin-bottom:0.4em}
p{margin-bottom:1em}
p:last-child{margin-bottom:0}
strong{font-weight:700;color:var(--deep)}

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

#main-content{scroll-margin-top:130px}

.mono{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:0.08em;
  font-variant-numeric:tabular-nums;
}
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.18em;
  color:var(--cyan);
  text-transform:uppercase;
}
.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;
}

/* ---------- 4. LAYOUT UTILITIES ---------- */
.shell{
  width:min(100% - var(--pad) * 2, var(--shell-w));
  margin-inline:auto;
}
.section{padding-block:clamp(44px,7vw,88px)}
.grid{display:grid;gap:clamp(16px,2.6vw,32px)}
.grid--split{grid-template-columns:4fr 7fr}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* 章节三件套 */
.chapter{margin-block:clamp(48px,7vw,92px)}
.chapter__head{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:0 clamp(12px,2vw,24px);
  align-items:baseline;
  margin-bottom:clamp(20px,3vw,36px);
}
.chapter__num{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:0.16em;
  color:var(--gold);
  padding-top:0.5em;
}
.chapter__title{
  margin:0;
  font-size:clamp(1.6rem,3.4vw,2.6rem);
  font-weight:900;
  color:var(--deep);
}
.chapter__lede{
  grid-column:2;
  margin-top:0.7em;
  max-width:34em;
  font-size:15px;
  line-height:1.8;
  color:var(--deep);
}

/* 色带（章节过渡） */
.band{
  position:relative;
  min-height:64px;
  background-color:var(--band);
  border-block:1px solid var(--line);
  overflow:hidden;
}
.band::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    repeating-linear-gradient(45deg,rgba(63,126,136,0.10) 0 1px,transparent 1px 22px),
    repeating-linear-gradient(-45deg,rgba(192,138,42,0.12) 0 1px,transparent 1px 22px);
  pointer-events:none;
}

/* 玻璃层与实色层 */
.glass-panel{
  background:var(--glass);
  border:1px solid var(--line);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  padding:clamp(16px,2.4vw,26px);
}
.surface{
  background:var(--paper-solid);
  border-top:2px solid var(--deep);
  padding:clamp(18px,2.6vw,30px);
}

/* 正文 */
.prose{max-width:42em}
.prose ul{list-style:disc;padding-left:1.3em;margin:0 0 1em}
.prose ol{list-style:decimal;padding-left:1.3em;margin:0 0 1em}
.prose li{margin:0.3em 0}
.prose a{border-bottom:1px solid var(--gold)}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  gap:0.55em;
  padding:0.72em 1.5em;
  font-family:var(--font-body);
  font-size:15px;
  font-weight:600;
  letter-spacing:0.08em;
  line-height:1.4;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:2px;
  transition:background-color 240ms var(--ease),color 240ms var(--ease),
             border-color 240ms var(--ease),transform 240ms var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--gold{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.btn--gold:hover{background:#A9761F;color:var(--ink)}
.btn--outline{background:transparent;color:var(--deep);border-color:var(--cyan)}
.btn--outline:hover{background:var(--cyan);color:#FFFFFF}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:0.4em;
  padding:0.2em 0.75em;
  font-size:12px;
  letter-spacing:0.14em;
  background:var(--gold-soft);
  color:var(--ink);
  border-radius:2px;
}
.tag--grape{background:var(--grape);color:#FFFFFF}
.tag--clay{background:var(--clay);color:#FFFFFF}

/* 面包屑 */
.breadcrumb{
  font-size:12px;
  letter-spacing:0.08em;
  color:var(--deep);
  padding-block:18px 0;
}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:0.5em;list-style:none}
.breadcrumb__list li+li::before{content:"/";margin-right:0.5em;color:var(--line)}
.breadcrumb__link{color:var(--deep);text-decoration:none;border-bottom:1px solid transparent}
.breadcrumb__link:hover{border-bottom-color:var(--gold)}

/* 图文容器基础规则（页面阶段填图） */
.figure{margin:0}
.figure__frame{
  position:relative;
  aspect-ratio:16/10;
  overflow:hidden;
  background-color:var(--band);
  background-image:
    repeating-linear-gradient(45deg,rgba(63,126,136,0.10) 0 1px,transparent 1px 18px),
    repeating-linear-gradient(-45deg,rgba(192,138,42,0.12) 0 1px,transparent 1px 18px);
  border:1px solid var(--line);
}
.figure__img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  position:relative;
  z-index:1;
}
.figure__caption{
  margin-top:0.7em;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.08em;
  color:var(--deep);
}
.figure--board .figure__frame{aspect-ratio:4/3}
.figure--tile .figure__frame{aspect-ratio:1/1}
.figure--timeline .figure__frame{aspect-ratio:21/9}

/* 滚动显现 */
[data-reveal]{
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
  transition-delay:calc(var(--i,0) * var(--stagger));
}
[data-reveal].reveal-armed{opacity:0;transform:translateY(16px)}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 5. HEADER ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-72px;
  z-index:99;
  padding:10px 18px;
  background:var(--ink);
  color:#FFFFFF;
  font-size:14px;
  letter-spacing:0.08em;
  text-decoration:none;
  border-radius:2px;
  transition:top 200ms var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{top:12px;color:#FFFFFF}

.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(242,246,247,0.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  transition:background-color 300ms var(--ease),box-shadow 300ms var(--ease);
}
.site-header.is-compact{
  background:rgba(242,246,247,0.98);
  box-shadow:0 10px 30px -26px rgba(22,51,58,0.9);
}
.header-shell{
  width:min(100% - var(--pad) * 2, var(--shell-w));
  margin-inline:auto;
  display:grid;
  grid-template-areas:"masthead" "nav";
  transition:padding 300ms var(--ease);
}

/* 刊头 */
.masthead{
  grid-area:masthead;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:10px;
  padding-block:20px 12px;
  transition:padding 300ms var(--ease);
}
.masthead-center{grid-column:2;text-align:center;min-width:0}
.masthead-side{display:flex;align-items:center;gap:10px}
.masthead-side--start{grid-column:1;justify-self:start}
.masthead-side--end{grid-column:3;justify-self:end}

.seal-mark{
  display:grid;
  place-items:center;
  width:38px;
  height:46px;
  border:1px solid var(--gold);
  border-radius:2px;
  color:var(--gold);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:0.1em;
  line-height:1.2;
  writing-mode:vertical-rl;
  text-orientation:upright;
  opacity:0.85;
}

.brand{
  display:inline-block;
  text-decoration:none;
  color:var(--ink);
}
.brand-name{
  display:inline-block;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.6rem,3.1vw,2.35rem);
  letter-spacing:0.06em;
  line-height:1.1;
  color:var(--ink);
  transition:font-size 300ms var(--ease);
}
.brand:hover .brand-name{color:var(--deep)}
.brand-sub{
  margin-top:4px;
  font-size:12px;
  letter-spacing:0.32em;
  text-indent:0.32em;
  color:var(--deep);
  opacity:0.82;
}

.update-pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 13px;
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:999px;
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
  font-size:12px;
  white-space:nowrap;
}
.update-pill__label{letter-spacing:0.14em;color:var(--deep);opacity:0.8}
.update-pill__clock{
  color:var(--gold);
  font-weight:700;
  letter-spacing:0.04em;
  animation:clock-breath 2.4s var(--ease) infinite;
}
.update-pill__version{
  padding-left:9px;
  border-left:1px solid var(--line);
  color:var(--deep);
  font-size:12px;
}
@keyframes clock-breath{
  0%,100%{opacity:1}
  50%{opacity:0.62}
}

/* 栏目条 */
.site-nav{
  grid-area:nav;
  border-top:1px solid var(--line);
}
.nav-list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:clamp(10px,2.2vw,30px);
  padding:8px 0 12px;
}
.nav-item{list-style:none}
.nav-link{
  position:relative;
  display:inline-block;
  padding:6px 2px;
  font-size:15px;
  letter-spacing:0.08em;
  color:var(--deep);
  text-decoration:none;
  transition:color 200ms var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:var(--gold);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform 280ms var(--ease);
}
.nav-link:hover{color:var(--ink)}
.nav-link:hover::after,
.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--ink);font-weight:700}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

/* 移动端按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:7px 13px;
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:999px;
  font-size:12px;
  letter-spacing:0.14em;
  color:var(--deep);
}
.nav-toggle__bars{
  position:relative;
  display:inline-block;
  width:16px;
  height:10px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:var(--gold);
  transition:transform 280ms var(--ease),top 280ms var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

/* 压缩态（仅桌面） */
@media (min-width:901px){
  .site-header.is-compact .header-shell{
    grid-template-areas:"masthead nav";
    grid-template-columns:auto 1fr;
    align-items:center;
    gap:clamp(16px,3vw,44px);
  }
  .site-header.is-compact .masthead{
    grid-template-columns:auto;
    padding-block:10px;
  }
  .site-header.is-compact .masthead-side--start,
  .site-header.is-compact .masthead-side--end,
  .site-header.is-compact .brand-sub{display:none}
  .site-header.is-compact .masthead-center{text-align:left}
  .site-header.is-compact .brand-name{font-size:1.3rem}
  .site-header.is-compact .site-nav{border-top:0;justify-self:end}
  .site-header.is-compact .nav-list{padding:0;gap:clamp(10px,1.8vw,24px)}
  .site-header.is-compact .nav-link{font-size:14px;padding:4px 2px}
}

/* ---------- 6. FOOTER ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,104px);
  background-color:var(--ink);
  color:#DCE9EB;
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    repeating-linear-gradient(45deg,rgba(239,217,163,0.07) 0 1px,transparent 1px 20px),
    repeating-linear-gradient(-45deg,rgba(63,126,136,0.20) 0 1px,transparent 1px 20px);
  pointer-events:none;
}
.footer-shell{
  position:relative;
  z-index:1;
  width:min(100% - var(--pad) * 2, var(--shell-w));
  margin-inline:auto;
  padding-block:clamp(40px,6vw,64px) clamp(28px,4vw,44px);
  display:grid;
  grid-template-columns:1.15fr 1.35fr 1.1fr;
  gap:clamp(24px,4vw,60px);
}
.footer-brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.4rem,2.2vw,1.85rem);
  letter-spacing:0.06em;
  color:#FFFFFF;
  line-height:1.2;
}
.footer-brand__line{
  margin-top:8px;
  font-size:15px;
  letter-spacing:0.18em;
  color:var(--gold-soft);
}
.footer-brand__meta{
  margin-top:14px;
  font-size:12px;
  letter-spacing:0.1em;
  color:rgba(220,233,235,0.66);
}
.footer-nav{display:grid;grid-template-columns:1fr 1fr;gap:clamp(16px,2.4vw,28px)}
.footer-nav__title{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:0.2em;
  color:var(--gold-soft);
  margin-bottom:12px;
}
.footer-nav__list{display:grid;gap:9px}
.footer-link{
  color:#DCE9EB;
  font-size:14px;
  letter-spacing:0.06em;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color 200ms var(--ease),border-color 200ms var(--ease);
}
.footer-link:hover{color:var(--gold-soft);border-bottom-color:var(--gold)}

.footer-contact__list{display:grid;gap:2px}
.footer-contact__item{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:4px 10px;
  padding-block:7px;
  border-bottom:1px solid rgba(220,233,235,0.14);
}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:0.16em;
  color:var(--gold-soft);
  min-width:34px;
}
.footer-contact__value{
  font-size:13px;
  color:#DCE9EB;
  word-break:break-all;
}
.footer-contact__value.mono{letter-spacing:0.04em}
.footer-note{
  margin-top:14px;
  font-size:12px;
  letter-spacing:0.06em;
  color:rgba(220,233,235,0.66);
}

.copy-btn{
  display:inline-flex;
  align-items:center;
  padding:2px 8px;
  font-size:11px;
  letter-spacing:0.12em;
  color:rgba(220,233,235,0.78);
  background:transparent;
  border:1px solid rgba(220,233,235,0.28);
  border-radius:2px;
  transition:color 200ms var(--ease),border-color 200ms var(--ease);
}
.copy-btn:hover{color:var(--gold-soft);border-color:var(--gold)}
.copy-btn[data-state="copied"]{color:var(--clay-light);border-color:var(--clay-light)}
.copy-btn[data-state="error"]{color:var(--gold-soft);border-color:var(--gold)}

.footer-bar{
  position:relative;
  z-index:1;
  width:min(100% - var(--pad) * 2, var(--shell-w));
  margin-inline:auto;
  padding-block:16px 24px;
  border-top:1px solid rgba(220,233,235,0.18);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 20px;
  font-size:12px;
  letter-spacing:0.06em;
  color:rgba(220,233,235,0.68);
}
.footer-bar__icp,
.footer-bar__copy{margin:0;font-size:12px;letter-spacing:0.08em}
.region-mark{display:inline-flex;align-items:center}
.region-mark__shield{
  display:inline-grid;
  place-items:center;
  width:40px;
  height:30px;
  clip-path:polygon(50% 0,100% 16%,100% 58%,50% 100%,0 58%,0 16%);
  background:rgba(239,217,163,0.18);
  color:var(--gold-soft);
  font-family:var(--font-mono);
  font-size:9px;
  letter-spacing:0.02em;
}

/* ---------- 7. RESPONSIVE ---------- */
@media (max-width:1080px){
  .grid--split{grid-template-columns:1fr}
  .footer-shell{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:900px){
  .masthead{
    grid-template-columns:1fr auto;
    grid-template-areas:"center end";
    gap:10px;
    padding-block:14px 10px;
  }
  .masthead-side--start{display:none}
  .masthead-center{grid-area:center;text-align:left}
  .masthead-side--end{grid-area:end}
  .brand-name{font-size:clamp(1.3rem,5vw,1.6rem)}
  .brand-sub{font-size:10px;letter-spacing:0.22em;text-indent:0.22em}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    border-top:1px solid var(--line);
    background:rgba(242,246,247,0.98);
  }
  .site-nav[data-open]{display:block}
  .nav-list{
    justify-content:flex-start;
    flex-wrap:nowrap;
    overflow-x:auto;
    gap:22px;
    padding:12px 2px 14px;
    scrollbar-width:thin;
    -webkit-overflow-scrolling:touch;
  }
  .nav-link{white-space:nowrap;font-size:14px}
  .grid--3{grid-template-columns:1fr}
  .chapter__head{grid-template-columns:1fr;gap:6px}
  .chapter__lede{grid-column:1;margin-top:0.3em}
  .chapter__num{padding-top:0}
}
@media (max-width:700px){
  .update-pill__label{display:none}
  .update-pill{padding:5px 10px;gap:6px}
  .footer-shell{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:1fr 1fr}
  .footer-bar{justify-content:flex-start}
}
@media (max-width:520px){
  .seal-mark{display:none}
  .update-pill__version{display:none}
  .footer-nav{grid-template-columns:1fr}
  .footer-contact__value{font-size:12px}
}

/* ---------- 8. MOTION SAFETY ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:0.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:120ms!important;
    transition-delay:0ms!important;
    scroll-behavior:auto!important;
  }
  [data-reveal],
  [data-reveal].reveal-armed{opacity:1;transform:none}
  .btn:hover{transform:none}
  .update-pill__clock{animation:none}
}