/* ============================================================
   1973 棋牌主站 · 共享样式表
   位置：/assets/site.css
   基因：模块化 Bento × 近单色墨绿 × 切角 18/32px × -8° 斜切
   ============================================================ */

/* ---------- 1. 令牌 ---------- */
:root{
  --green-900:#0B241C;
  --green-800:#123A2E;
  --green-700:#1C5442;
  --green-600:#2C7159;
  --mist:#C9DCD2;
  --warm:#F5F1E6;
  --cinnabar:#B7332A;
  --cinnabar-dark:#7E2119;
  --gold:#C9A227;
  --glow:#F0D374;
  --ink:#0F1F19;
  --ink-muted:#4A6B5E;

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

  --cut-sm:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  --cut-md:polygon(18px 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%,0 18px);
  --cut-lg:polygon(32px 0,100% 0,100% calc(100% - 32px),calc(100% - 32px) 100%,0 100%,0 32px);
  --slant:-8deg;

  --wrap:1200px;
  --gap:clamp(16px,2.4vw,32px);
  --section-y:clamp(64px,9vw,160px);
  --header-h:84px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --hair:rgba(201,162,39,.28);
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 24px)}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
details>summary{list-style:none}
details>summary::-webkit-details-marker{display:none}
[hidden]{display:none !important}

/* ---------- 3. 中文排版 ---------- */
body{
  padding-top:var(--header-h);
  background:var(--warm);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.012em;
  min-height:100vh;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:900;line-height:1.18;letter-spacing:.005em;color:inherit}
h1{font-size:clamp(34px,5.4vw,64px)}
h2{font-size:clamp(28px,3.8vw,46px)}
h3{font-size:clamp(21px,2.2vw,26px)}
h4{font-size:19px}
p{max-width:68ch}
p+p{margin-top:1em}
strong,b{font-weight:700}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:13px;line-height:1;
  letter-spacing:.22em;text-transform:uppercase;color:var(--gold);
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--cinnabar);transform:skewX(var(--slant))}

/* ---------- 4. 布局骨架 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:clamp(20px,5vw,48px)}
.section{padding-block:var(--section-y)}
.section--tight{padding-block:clamp(40px,6vw,88px)}
.section--flush-top{padding-top:0}
.section--dark{background:var(--green-900);color:var(--warm)}
.section--deep{background:var(--green-800);color:var(--warm)}
.section--mist{background:var(--mist);color:var(--ink)}
.section--dark p,.section--deep p{color:rgba(201,220,210,.86)}
.hero-overlay{
  margin-top:calc(-1 * var(--header-h));
  padding-top:calc(var(--header-h) + clamp(48px,8vw,112px));
}
.grid{display:grid;gap:var(--gap)}
.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))}
.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-12{grid-column:span 12}

.band{
  background:var(--green-800);color:var(--warm);
  padding:clamp(26px,3.6vw,48px) clamp(20px,4vw,48px);
  clip-path:var(--cut-lg);
}
.band--light{background:var(--mist);color:var(--ink)}
.band--accent{background:var(--cinnabar);color:var(--warm)}

/* ---------- 5. 面板与图形 ---------- */
.panel{
  background:var(--green-800);color:var(--warm);
  padding:clamp(22px,3vw,40px);
  clip-path:var(--cut-lg);
}
.panel--mist{background:var(--mist);color:var(--ink)}
.panel--light{
  background:var(--warm);color:var(--ink);
  box-shadow:inset 0 0 0 1px var(--mist),0 22px 46px -34px rgba(11,36,28,.7);
}
.panel--accent{box-shadow:inset 0 4px 0 0 var(--cinnabar)}
.panel--light.panel--accent{box-shadow:inset 0 4px 0 0 var(--cinnabar),inset 0 0 0 1px var(--mist),0 22px 46px -34px rgba(11,36,28,.7)}

.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:4px 12px;
  font-family:var(--font-mono);font-size:13px;line-height:1.5;letter-spacing:.08em;
  color:var(--green-600);
  box-shadow:inset 0 0 0 1px rgba(44,113,89,.45);
  clip-path:var(--cut-sm);
}
.chip--gold{color:var(--gold);box-shadow:inset 0 0 0 1px rgba(201,162,39,.5)}
.chip--accent{color:var(--warm);background:var(--cinnabar);box-shadow:none}

.divider-scale{
  position:relative;width:100%;height:14px;
  background-image:repeating-linear-gradient(90deg,var(--green-600) 0 1px,transparent 1px 26px);
  opacity:.6;
}
.divider-scale::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,rgba(201,162,39,.6),rgba(201,162,39,0));
}

.stat{display:grid;gap:6px}
.stat__value{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(44px,7.4vw,104px);font-weight:600;line-height:.95;letter-spacing:-.045em;
  color:var(--glow);
}
.stat__label{font-size:14px;letter-spacing:.14em;color:var(--ink-muted)}
.section--dark .stat__label,.section--deep .stat__label,.panel .stat__label{color:var(--mist)}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.74em 1.45em;
  font-family:var(--font-body);font-size:15px;font-weight:500;line-height:1.2;letter-spacing:.05em;
  border:0;cursor:pointer;
  clip-path:var(--cut-sm);
  transition:background-color .22s var(--ease),color .22s var(--ease),box-shadow .22s var(--ease),transform .22s var(--ease);
}
.btn--accent{background:var(--cinnabar);color:var(--warm)}
.btn--accent:hover{background:var(--cinnabar-dark)}
.btn--accent:active{transform:translateY(1px)}
.btn--ghost{color:var(--warm);box-shadow:inset 0 0 0 1px rgba(201,162,39,.55)}
.btn--ghost:hover{background:rgba(201,162,39,.12);color:var(--glow)}
.btn--gold{background:var(--gold);color:var(--green-900)}
.btn--gold:hover{background:var(--glow)}

/* ---------- 7. 头部 ---------- */
.skip-link{
  position:fixed;left:14px;top:-80px;z-index:200;
  padding:10px 18px;
  background:var(--cinnabar);color:var(--warm);
  font-size:15px;letter-spacing:.04em;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:14px}

.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;
  background:linear-gradient(180deg,rgba(11,36,28,.88),rgba(11,36,28,0));
  transition:background-color .3s var(--ease),box-shadow .3s var(--ease);
}
.site-header.is-scrolled{
  background-color:var(--green-900);background-image:none;
  box-shadow:0 1px 0 var(--hair),0 20px 44px -34px rgba(0,0,0,.95);
}
.site-header__inner{
  position:relative;
  display:flex;align-items:center;gap:clamp(12px,2vw,28px);
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding-inline:clamp(18px,5vw,48px);
  min-height:var(--header-h);
  transition:min-height .3s var(--ease);
}
.site-header.is-scrolled .site-header__inner{min-height:64px}
.site-header__progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(201,162,39,.16);overflow:hidden;
  opacity:0;transition:opacity .3s var(--ease);
}
.site-header.is-scrolled .site-header__progress{opacity:1}
.site-header__progress-bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--glow));
  transition:transform .12s linear;
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:12px;flex:none}
.brand__mark{
  position:relative;flex:none;width:38px;height:38px;
  background:linear-gradient(140deg,var(--green-700),var(--green-900));
  box-shadow:inset 0 0 0 1px rgba(201,162,39,.55);
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  transform:rotate(-4deg);
  transition:transform .3s var(--ease);
}
.brand:hover .brand__mark,.footer-brand__link:hover .brand__mark{transform:rotate(-9deg)}
.brand__pip{position:absolute;width:6px;height:6px;border-radius:50%;background:var(--gold)}
.brand__pip:nth-child(1){top:9px;left:9px}
.brand__pip:nth-child(2){top:9px;right:9px}
.brand__pip:nth-child(3){bottom:8px;left:50%;transform:translateX(-50%);background:var(--cinnabar)}
.brand__text{display:flex;flex-direction:column;line-height:1.25}
.brand__name{font-family:var(--font-display);font-weight:900;font-size:20px;letter-spacing:.06em;color:var(--warm)}
.brand__note{font-size:12px;letter-spacing:.02em;color:rgba(201,220,210,.75)}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;
  margin-left:auto;
  align-items:center;gap:10px;
  padding:8px 12px;cursor:pointer;
  color:var(--warm);
  box-shadow:inset 0 0 0 1px rgba(201,162,39,.45);
  clip-path:var(--cut-sm);
}
.nav-toggle__bars{display:grid;gap:4px;width:18px}
.nav-toggle__bars span{display:block;height:2px;background:var(--warm);transition:transform .25s var(--ease),opacity .25s var(--ease)}
.nav-toggle__label{font-family:var(--font-mono);font-size:13px;letter-spacing:.14em}
.nav-toggle[data-open="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[data-open="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[data-open="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* 导航 */
.site-nav{display:flex;align-items:center;gap:clamp(10px,1.8vw,26px);margin-left:auto}
.site-nav__list{display:flex;align-items:center;gap:clamp(8px,1.5vw,22px)}
.site-nav__item{display:flex}
.site-nav__link{
  position:relative;display:inline-block;
  padding:6px 2px;
  font-size:15px;letter-spacing:.03em;
  color:rgba(245,241,230,.82);
  transition:color .22s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:18px;
  background:var(--cinnabar);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .25s var(--ease);
}
.site-nav__link:hover{color:var(--warm)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--warm)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--gold)}
.site-nav__cta{flex:none}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,10vw,140px);
  padding-block:clamp(92px,10vw,140px) clamp(28px,4vw,44px);
  background:var(--green-900);
  color:var(--mist);
  clip-path:polygon(0 56px,100% 0,100% 100%,0 100%);
}
.site-footer__inner{display:grid;gap:clamp(36px,5vw,60px)}
.site-footer__top{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,.75fr)) minmax(0,1.3fr);
  gap:clamp(24px,3.4vw,48px);
  align-items:start;
}
.footer-brand__link{display:inline-flex;align-items:center;gap:12px}
.footer-brand__name{font-family:var(--font-display);font-weight:900;font-size:24px;letter-spacing:.06em;color:var(--warm)}
.footer-brand__intro{margin-top:16px;font-size:15px;line-height:1.75;color:rgba(201,220,210,.82);max-width:34ch}
.footer-col__title{
  font-family:var(--font-mono);font-weight:400;
  font-size:13px;letter-spacing:.2em;line-height:1.4;
  color:var(--gold);margin-bottom:16px;
}
.footer-col__list{display:grid;gap:11px}
.footer-link{
  display:inline-block;
  font-size:15px;color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .22s var(--ease),border-color .22s var(--ease);
}
.footer-link:hover{color:var(--warm);border-bottom-color:var(--cinnabar)}

.footer-contact__list{display:grid;gap:16px}
.footer-contact__item{display:grid;gap:5px}
.footer-contact__label{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--green-600)}
.footer-contact__text{font-size:15px;color:var(--mist)}
.copy-btn{
  display:inline-flex;align-items:center;gap:10px;flex-wrap:wrap;
  padding:0 0 2px;
  cursor:pointer;text-align:left;
  color:var(--warm);
  border-bottom:1px dashed rgba(201,162,39,.5);
  transition:color .22s var(--ease),border-color .22s var(--ease);
}
.copy-btn__value{font-family:var(--font-mono);font-size:14px;letter-spacing:-.01em}
.copy-btn__hint{font-size:12px;letter-spacing:.1em;color:var(--green-600)}
.copy-btn:hover{color:var(--glow);border-bottom-color:var(--glow)}
.copy-btn:hover .copy-btn__hint{color:var(--gold)}
.copy-btn[data-copied="true"] .copy-btn__hint{color:var(--glow)}

.footer-legal{
  display:grid;gap:14px;
  padding-top:clamp(20px,3vw,28px);
  border-top:1px solid rgba(201,162,39,.22);
}
.footer-legal__note{font-size:13.5px;line-height:1.7;color:rgba(201,220,210,.7);max-width:88ch}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px 28px;
  align-items:center;justify-content:space-between;
}
.footer-meta{font-size:13.5px;color:rgba(201,220,210,.7)}
.footer-legal__icp{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--gold)}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb{font-size:14px;color:var(--ink-muted)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.5em}
.breadcrumb__item{display:flex;align-items:center;gap:.5em}
.breadcrumb__item::after{content:"/";color:var(--green-600);transform:skewX(var(--slant))}
.breadcrumb__item:last-child::after{content:""}
.breadcrumb__link{color:var(--ink-muted);border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease)}
.breadcrumb__link:hover{color:var(--cinnabar);border-bottom-color:var(--cinnabar)}
.breadcrumb__current{color:var(--ink);font-weight:600}
.section--dark .breadcrumb,.section--deep .breadcrumb{color:var(--mist)}
.section--dark .breadcrumb__current,.section--deep .breadcrumb__current{color:var(--warm)}
.section--dark .breadcrumb__link,.section--deep .breadcrumb__link{color:var(--mist)}

/* ---------- 10. 章节锚点 ---------- */
.chapter{position:relative}
.chapter__head{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.chapter__tick{
  flex:none;width:36px;height:2px;background:var(--cinnabar);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .35s var(--ease);
}
.chapter.is-active .chapter__tick{transform:scaleX(1)}
.chapter__index{font-family:var(--font-mono);font-size:14px;letter-spacing:.16em;color:var(--gold)}
.chapter__title{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(26px,3.4vw,42px);line-height:1.2;
  opacity:.5;transition:opacity .35s var(--ease);
}
.chapter.is-active .chapter__title{opacity:1}

/* ---------- 11. 标签页 ---------- */
.tabs{display:grid;gap:0}
.tabs__list{display:flex;flex-wrap:wrap;gap:8px;border-bottom:1px solid var(--hair);padding-bottom:12px}
.tabs__btn{
  padding:.5em 1.1em;cursor:pointer;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;
  color:var(--ink-muted);
  box-shadow:inset 0 0 0 1px rgba(44,113,89,.4);
  clip-path:var(--cut-sm);
  transition:background-color .22s var(--ease),color .22s var(--ease),box-shadow .22s var(--ease);
}
.tabs__btn:hover{color:var(--green-700);box-shadow:inset 0 0 0 1px var(--green-600)}
.tabs__btn[aria-selected="true"]{background:var(--cinnabar);color:var(--warm);box-shadow:none}
.tabs__panel{padding-top:clamp(20px,3vw,32px)}
.tabs__panel[hidden]{display:none}
.section--dark .tabs__btn,.section--deep .tabs__btn{color:var(--mist)}

/* ---------- 12. 折叠问答 ---------- */
.accordion{display:grid;gap:12px}
.accordion__item{
  background:var(--warm);color:var(--ink);
  box-shadow:inset 0 0 0 1px var(--mist);
  clip-path:var(--cut-md);
}
.accordion__item[open]{box-shadow:inset 0 0 0 1px var(--green-600)}
.accordion__btn{
  display:flex;align-items:flex-start;justify-content:space-between;gap:18px;
  padding:18px clamp(18px,2.6vw,26px);
  cursor:pointer;
  font-family:var(--font-display);font-weight:900;font-size:19px;line-height:1.45;
}
.accordion__btn::after{content:"+";flex:none;font-family:var(--font-mono);font-size:20px;color:var(--cinnabar)}
.accordion__item[open] .accordion__btn::after{content:"—"}
.accordion__panel{padding:0 clamp(18px,2.6vw,26px) 20px;font-size:16px;color:var(--ink-muted)}
.section--dark .accordion__item,.section--deep .accordion__item{background:var(--green-800);color:var(--warm);box-shadow:inset 0 0 0 1px rgba(201,162,39,.25)}
.section--dark .accordion__panel,.section--deep .accordion__panel{color:var(--mist)}

/* ---------- 13. 图片容器基础规则 ---------- */
.media{
  display:block;position:relative;overflow:hidden;
  background:var(--green-800);
  clip-path:var(--cut-md);
}
.media__frame{
  position:relative;width:100%;height:100%;
  background:
    repeating-linear-gradient(var(--slant),rgba(201,220,210,.06) 0 1px,transparent 1px 14px),
    linear-gradient(140deg,var(--green-700),var(--green-900));
}
.media img{width:100%;height:100%;object-fit:cover;display:block}
.media--16x9 .media__frame{aspect-ratio:16/9}
.media--4x3 .media__frame{aspect-ratio:4/3}
.media--3x4 .media__frame{aspect-ratio:3/4}
.media--1x1 .media__frame{aspect-ratio:1/1}
.media--wide{grid-column:span 7}
.media--tall{grid-column:span 5}
.media__caption{
  padding:12px 2px 0;
  font-size:14px;line-height:1.6;color:var(--ink-muted);
}
.section--dark .media__caption,.section--deep .media__caption{color:var(--mist)}

/* ---------- 14. 动效与工具 ---------- */
.reveal{opacity:0;transform:translateY(8px);transition:opacity .42s var(--ease),transform .42s var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- 15. 可访问性 ---------- */
:focus-visible{outline:2px solid var(--glow);outline-offset:3px}

/* ---------- 16. 响应式 ---------- */
@media (max-width:1180px){
  .site-footer__top{grid-template-columns:minmax(0,1.4fr) repeat(2,minmax(0,1fr))}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:1024px){
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .span-3,.span-4,.span-5{grid-column:span 6}
  .span-6,.span-7,.span-8{grid-column:span 12}
  .media--wide,.media--tall{grid-column:span 12}
}
@media (max-width:899px){
  :root{--header-h:66px}
  .brand__note{display:none}
  .nav-toggle{display:inline-flex}
  .site-header.is-scrolled .site-header__inner{min-height:56px}
  .site-nav{
    position:fixed;left:0;right:0;top:var(--header-h);
    display:grid;gap:4px;margin-left:0;
    max-height:calc(100vh - var(--header-h));overflow-y:auto;
    padding:18px clamp(20px,6vw,40px) 34px;
    background:var(--green-900);
    border-top:1px solid var(--hair);
    opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-10px);
    transition:opacity .25s var(--ease),transform .25s var(--ease),visibility .25s linear;
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .site-nav__list{display:grid;gap:2px}
  .site-nav__link{
    display:block;width:100%;
    padding:14px 4px;font-size:18px;
    border-bottom:1px solid rgba(201,162,39,.14);
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{color:var(--glow)}
  .site-nav__cta{margin-top:18px;width:100%;justify-content:center}
}
@media (max-width:680px){
  .grid--2,.grid--3,.grid--4,.grid--12{grid-template-columns:1fr}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:1 / -1}
  .site-footer{clip-path:polygon(0 32px,100% 0,100% 100%,0 100%)}
  .site-footer__top{grid-template-columns:1fr}
  .footer-contact{grid-column:auto}
  .footer-bottom{justify-content:flex-start}
  .tabs__list{gap:6px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
  .chapter__title{opacity:1}
  .chapter__tick{transform:scaleX(1)}
}