/* =========================================================
   闲逸麻将 · 全站共享样式表  /assets/site.css
   夜桌牌局体系：深海蓝铺底 / 椰影青作面板 / 牌桌绿与暖橙承担功能
   切角、斜线、牌墩节奏贯穿所有共享组件
   ========================================================= */

/* ---------- 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,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:where(h1,h2,h3,h4){font-weight:900;line-height:1.2}
[id]{scroll-margin-top:104px}

/* ---------- 2. Tokens ---------- */
:root{
  --c-deep:#0B1E2D;
  --c-teal:#123A3A;
  --c-table:#1F6B4A;
  --c-ivory:#F4EFE6;
  --c-mist:#9AB0B8;
  --c-amber:#F59A3C;
  --c-red:#C8452F;
  --c-gold:#D9B26A;
  --c-night:#06121B;

  --surface:rgba(18,58,58,.52);
  --surface-deep:rgba(6,18,27,.72);
  --line:rgba(154,176,184,.22);
  --line-strong:rgba(154,176,184,.42);

  --text:var(--c-ivory);
  --text-soft:rgba(244,239,230,.76);
  --text-mute:var(--c-mist);

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

  --step-h1:clamp(2.5rem,6vw,4.5rem);
  --step-h2:clamp(1.7rem,3.2vw,2.25rem);
  --step-h3:clamp(1.12rem,1.6vw,1.35rem);
  --step-body:clamp(1rem,1.05vw,1.125rem);

  --shell:1240px;
  --gap:clamp(18px,2.4vw,30px);
  --ease-shuffle:cubic-bezier(.22,.9,.28,1);
  --shadow-tile:0 18px 40px rgba(3,12,19,.55);
  --cut-sm:8px;
  --cut:14px;
  --cut-lg:22px;

  --z-header:80;
  --z-nav:75;
  --z-toggle:90;
}

/* ---------- 3. Base ---------- */
body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:var(--step-body);
  line-height:1.7;
  letter-spacing:.01em;
  color:var(--text);
  background:
    radial-gradient(1200px 620px at 84% -10%, rgba(31,107,74,.30), transparent 62%),
    radial-gradient(900px 520px at 4% 10%, rgba(18,58,58,.75), transparent 66%),
    var(--c-deep);
  background-attachment:fixed;
  text-rendering:optimizeLegibility;
}
h1,h2,h3{font-family:var(--font-display);letter-spacing:.005em}
h1{font-size:var(--step-h1)}
h2{font-size:var(--step-h2)}
h3{font-size:var(--step-h3)}
p{text-wrap:pretty}
:focus-visible{outline:2px solid var(--c-amber);outline-offset:3px;border-radius:2px}
::selection{background:var(--c-amber);color:#1A1206}
html.nav-locked{overflow:hidden}

/* ---------- 4. Utilities ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(18px,5vw,48px)}
.shell--narrow{max-width:820px}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:200;
  padding:.7rem 1.15rem;
  background:var(--c-amber);color:#1A1206;
  font-weight:700;font-size:.9rem;
  border-radius:0 0 10px 10px;
  transition:top .22s ease;
}
.skip-link:focus{top:0}

/* ---------- 5. Header ---------- */
.site-header{
  position:sticky;top:0;z-index:var(--z-header);
  background:rgba(11,30,45,.86);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.header-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(154,176,184,.14);overflow:hidden}
.header-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--c-table),var(--c-amber));
  transition:transform .12s linear;
}
.header-shell{
  display:flex;align-items:center;justify-content:space-between;
  gap:clamp(14px,3vw,32px);
  min-height:78px;
}
.brand{display:inline-flex;align-items:center;gap:.75rem;flex:0 0 auto}
.brand__tile{
  display:grid;place-items:center;
  width:42px;height:42px;
  background:linear-gradient(148deg,var(--c-ivory) 0%,#E6DCC9 58%,var(--c-gold) 100%);
  color:var(--c-deep);
  font-family:var(--font-display);
  font-size:1.42rem;font-weight:900;line-height:1;
  clip-path:polygon(11px 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%,0 11px);
  box-shadow:var(--shadow-tile);
}
.brand__text{display:flex;flex-direction:column;gap:.1rem}
.brand__name{font-family:var(--font-display);font-weight:900;font-size:1.1rem;letter-spacing:.06em;color:var(--c-ivory)}
.brand__tagline{font-size:.68rem;letter-spacing:.3em;color:var(--c-mist);text-transform:none}

.site-nav{display:flex;align-items:center;gap:clamp(14px,2.2vw,30px);margin-left:auto}
.site-nav__list{display:flex;align-items:center;gap:clamp(12px,1.8vw,26px)}
.site-nav__item{position:relative}
.site-nav__link{
  position:relative;display:inline-block;
  padding:.6rem .1rem;
  font-size:.95rem;font-weight:500;
  color:rgba(244,239,230,.76);
  transition:color .25s ease;
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:.22rem;height:1px;
  background:currentColor;transform:scaleX(0);transform-origin:left center;
  transition:transform .38s var(--ease-shuffle);
}
.site-nav__link:hover{color:var(--c-ivory)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--c-amber)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--c-amber)}
.site-nav__cta{flex:0 0 auto}

.nav-toggle{
  display:none;align-items:center;gap:.6rem;
  position:relative;z-index:var(--z-toggle);
  padding:.58rem .82rem;
  background:rgba(18,58,58,.72);
  border:1px solid var(--line-strong);
  color:var(--c-ivory);
  font-size:.8rem;font-weight:600;letter-spacing:.14em;
  cursor:pointer;
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  transition:border-color .3s ease,color .3s ease;
}
.nav-toggle:hover{border-color:var(--c-amber);color:var(--c-amber)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:18px}
.nav-toggle__bars span{display:block;height:1.5px;width:100%;background:currentColor;transition:transform .35s var(--ease-shuffle),opacity .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

/* ---------- 6. Buttons / tags ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.8rem 1.4rem;
  font-family:var(--font-body);font-size:.94rem;font-weight:600;line-height:1;letter-spacing:.04em;
  color:var(--c-ivory);background:var(--c-table);
  border:1px solid transparent;
  cursor:pointer;
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  transition:transform .3s var(--ease-shuffle),background-color .3s ease,color .3s ease,border-color .3s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn--accent{background:var(--c-amber);color:#1A1206}
.btn--accent:hover{background:#FFAE55}
.btn--ghost{background:transparent;color:var(--c-ivory);border-color:var(--line-strong)}
.btn--ghost:hover{border-color:var(--c-amber);color:var(--c-amber)}

.tag{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.3rem .7rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--text-soft);
  border:1px solid var(--line-strong);border-radius:999px;
}
.tag--green{border-color:rgba(31,107,74,.75);background:rgba(31,107,74,.24);color:#BEE7CF}
.tag--amber{border-color:rgba(245,154,60,.6);background:rgba(245,154,60,.14);color:var(--c-amber)}
.tag--red{border-color:rgba(200,69,47,.62);background:rgba(200,69,47,.16);color:#F0A797}

/* ---------- 7. Layout ---------- */
.section{position:relative;padding-block:clamp(56px,9vw,116px)}
.section--tight{padding-block:clamp(36px,5vw,66px)}
.section--teal{background:linear-gradient(180deg,transparent,rgba(18,58,58,.62) 32%,rgba(18,58,58,.62) 68%,transparent)}
.section__head{max-width:62ch;margin-bottom:clamp(28px,4vw,48px)}
.section__title{font-family:var(--font-display);color:var(--c-ivory);letter-spacing:.01em}
.lede{max-width:60ch;margin-top:.9rem;font-size:var(--step-body);line-height:1.85;color:var(--text-soft)}

.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  font-family:var(--font-mono);font-size:.72rem;font-weight:600;
  letter-spacing:.24em;text-transform:uppercase;
  color:var(--c-amber);
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor}

.hr-slant{
  height:1px;border:0;margin-block:clamp(30px,5vw,60px);
  background:linear-gradient(90deg,transparent,var(--line-strong) 14%,var(--c-amber) 50%,var(--line-strong) 86%,transparent);
}

.grid{display:grid;gap:var(--gap)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(228px,1fr))}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,4fr)}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-12{grid-column:span 12}

/* ---------- 8. Blocks ---------- */
.panel{
  position:relative;
  padding:clamp(20px,2.6vw,32px);
  background:var(--surface);
  border:1px solid var(--line);
  clip-path:polygon(20px 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%,0 20px);
}
.panel--solid{background:var(--surface-deep)}
.panel--accent{border-color:rgba(245,154,60,.45)}
.panel__title{font-family:var(--font-display);font-size:var(--step-h3);color:var(--c-ivory);margin-bottom:.65rem}

.note{padding-left:1rem;border-left:2px solid var(--c-table);font-size:.95rem;line-height:1.8;color:var(--text-soft)}

.prose{max-width:68ch;font-size:var(--step-body);line-height:1.85;color:var(--text-soft)}
.prose h2{margin:2.2em 0 .7em;font-size:var(--step-h2);color:var(--c-ivory)}
.prose h3{margin:1.8em 0 .6em;color:var(--c-ivory)}
.prose p+p{margin-top:1em}
.prose ul{margin:1em 0;display:grid;gap:.5em}
.prose li{position:relative;padding-left:1.15rem}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;background:var(--c-amber);transform:rotate(45deg)}
.prose strong{color:var(--c-ivory)}

.stat{display:flex;flex-direction:column;gap:.3rem}
.stat__value{font-family:var(--font-mono);font-size:clamp(1.6rem,3vw,2.3rem);font-weight:700;letter-spacing:-.02em;color:var(--c-amber)}
.stat__label{font-size:.85rem;letter-spacing:.06em;color:var(--text-mute)}

.status{display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.status__row{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;padding:.85rem 1.05rem;background:var(--surface-deep);font-size:.9rem}
.status__key{color:var(--text-mute)}
.status__val{font-family:var(--font-mono);font-size:.88rem;color:var(--text)}
.status__val--ok{color:#BEE7CF}
.status__val--warn{color:var(--c-amber)}

.mahjong-tile{
  display:grid;place-items:center;
  width:clamp(46px,6vw,64px);aspect-ratio:1;
  background:linear-gradient(148deg,var(--c-ivory) 0%,#E6DCC9 58%,var(--c-gold) 100%);
  color:var(--c-deep);
  font-family:var(--font-display);font-size:clamp(1.3rem,2.4vw,1.7rem);font-weight:900;line-height:1;
  clip-path:polygon(14% 0,100% 0,100% 86%,86% 100%,0 100%,0 14%);
  box-shadow:var(--shadow-tile);
}

.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem .7rem;padding-block:.85rem;font-size:.85rem;color:var(--text-mute)}
.crumbs__item{display:inline-flex;align-items:center;gap:.7rem}
.crumbs__item+.crumbs__item::before{content:"／";font-size:.82em;color:rgba(154,176,184,.45)}
.crumbs__link{color:var(--text-soft);border-bottom:1px solid transparent;transition:color .25s ease,border-color .25s ease}
.crumbs__link:hover{color:var(--c-amber);border-color:var(--c-amber)}

/* ---------- 9. Fold（翻牌展开） ---------- */
.fold{background:var(--surface-deep);border:1px solid var(--line);border-left:2px solid var(--c-table)}
.fold__trigger{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;width:100%;
  padding:1.05rem 1.25rem;
  text-align:left;font-size:1.02rem;font-weight:600;color:var(--c-ivory);cursor:pointer;
  transition:color .25s ease;
}
.fold__trigger:hover{color:var(--c-amber)}
.fold__icon{
  flex:0 0 auto;width:22px;height:22px;position:relative;
  border:1px solid var(--line-strong);
  clip-path:polygon(6px 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%,0 6px);
  transition:transform .4s var(--ease-shuffle),border-color .3s ease;
}
.fold__icon::before,.fold__icon::after{content:"";position:absolute;left:5px;right:5px;top:50%;height:1.5px;background:currentColor;transform:translateY(-50%)}
.fold__icon::after{transform:translateY(-50%) rotate(90deg);transition:opacity .3s ease,transform .4s var(--ease-shuffle)}
.fold[data-open] .fold__icon{border-color:var(--c-amber);transform:rotate(180deg)}
.fold[data-open] .fold__icon::after{opacity:0;transform:translateY(-50%) rotate(0deg)}
.fold__panel{display:grid;grid-template-rows:0fr;transition:grid-template-rows .5s var(--ease-shuffle)}
.fold__inner{overflow:hidden}
.fold__content{padding:0 1.25rem 1.3rem;font-size:.96rem;line-height:1.85;color:var(--text-soft)}
.fold[data-open] .fold__panel{grid-template-rows:1fr}

/* ---------- 10. Media frames ---------- */
.media-frame{
  position:relative;overflow:hidden;
  background:linear-gradient(155deg,var(--c-teal),var(--c-night));
  clip-path:polygon(22px 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%,0 22px);
}
.media-frame img,.media-frame video,.media-frame svg{display:block;width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(6,18,27,0) 42%,rgba(6,18,27,.78));
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--table{aspect-ratio:4/3}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame__caption{position:absolute;left:0;right:0;bottom:0;z-index:1;padding:1rem 1.2rem;font-size:.84rem;letter-spacing:.04em;color:rgba(244,239,230,.86)}

/* ---------- 11. Reveal ---------- */
html.has-js [data-reveal]{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease-shuffle),transform .7s var(--ease-shuffle)}
html.has-js [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 12. Footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,110px);
  background:linear-gradient(180deg,var(--c-night),#071722);
  border-top:1px solid var(--line);
  color:var(--text-soft);
}
.site-footer::before{
  content:"";display:block;height:6px;
  background:repeating-linear-gradient(90deg,rgba(217,178,106,.55) 0 22px,transparent 22px 40px);
  opacity:.65;
}
.footer-shell{
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(0,2fr);
  gap:clamp(32px,5vw,72px);
  padding-block:clamp(44px,7vw,84px);
}
.footer-brand{display:flex;flex-direction:column;gap:.6rem}
.footer-brand__name{font-family:var(--font-display);font-size:1.5rem;font-weight:900;letter-spacing:.08em;color:var(--c-ivory)}
.footer-brand__line{font-size:.9rem;letter-spacing:.14em;color:var(--c-gold)}
.footer-brand__note{max-width:34ch;font-size:.9rem;line-height:1.8;color:var(--text-mute)}
.footer-contact{display:grid;gap:.55rem;margin-top:1rem}
.footer-contact__item{display:flex;flex-wrap:wrap;gap:.2rem .7rem;font-size:.86rem}
.footer-contact__key{flex:0 0 auto;min-width:4.6em;color:var(--c-mist)}
.footer-contact__val{font-family:var(--font-mono);font-size:.84rem;color:rgba(244,239,230,.8);word-break:break-word}
.footer-cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(20px,3vw,32px)}
.footer-col__title{font-family:var(--font-mono);font-size:.76rem;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--c-amber);margin-bottom:1rem}
.footer-col__list{display:grid;gap:.6rem}
.footer-col__link{
  display:inline-block;font-size:.92rem;color:rgba(244,239,230,.74);
  border-bottom:1px solid transparent;
  transition:color .25s ease,border-color .25s ease,transform .3s var(--ease-shuffle);
}
.footer-col__link:hover{color:var(--c-amber);border-color:var(--c-amber);transform:translateX(3px)}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.6rem 1.4rem;
  padding-block:1.2rem 1.6rem;
  border-top:1px solid var(--line);
  font-size:.8rem;color:var(--text-mute);
}
.footer-base__icp{font-family:var(--font-mono);font-size:.78rem;letter-spacing:.04em}

/* ---------- 13. Responsive ---------- */
@media (max-width:1080px) and (min-width:901px){
  .site-nav{gap:14px}
  .site-nav__list{gap:12px}
  .site-nav__link{font-size:.88rem}
}

@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;top:0;right:0;bottom:0;left:auto;
    z-index:var(--z-nav);
    width:min(86vw,360px);
    display:flex;flex-direction:column;align-items:stretch;
    gap:.4rem;
    margin:0;
    padding:104px 26px 36px;
    background:linear-gradient(180deg,#071722,var(--c-night));
    border-left:1px solid var(--line);
    overflow-y:auto;
    transform:translateX(103%);
    pointer-events:none;
    transition:transform .46s var(--ease-shuffle);
  }
  .site-nav[data-open]{transform:translateX(0);pointer-events:auto;box-shadow:-24px 0 60px rgba(3,12,19,.6)}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:.15rem}
  .site-nav__link{
    display:block;width:100%;
    padding:.95rem .2rem;
    font-size:1.24rem;font-weight:600;
    border-bottom:1px dashed rgba(154,176,184,.18);
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{padding-left:.85rem;border-left:3px solid var(--c-amber)}
  .site-nav__cta{margin-top:1.6rem;width:100%;padding-block:1rem}
  .header-shell{min-height:68px}
  .grid--12,.grid--split{grid-template-columns:1fr}
  .col-4,.col-5,.col-6,.col-7,.col-12{grid-column:auto}
  .footer-shell{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:560px){
  .brand__tagline{display:none}
  .nav-toggle__label{display:none}
  .footer-cols{grid-template-columns:1fr}
  .footer-base{flex-direction:column;align-items:flex-start}
}

/* ---------- 14. Reduced motion ---------- */
@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;
  }
  .btn:hover,.footer-col__link:hover{transform:none}
  html.has-js [data-reveal]{opacity:1;transform:none}
}