/* ============================================================
   MG 游戏中心 · /assets/site.css
   共享外壳样式：reset / tokens / 排版 / 头部轨道 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video,canvas{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}
::selection{background:#FF3F9E;color:#FFFFFF;}

/* ---------- 2. Tokens ---------- */
:root{
  --ink:#0A0820;
  --ink-2:#141033;
  --ink-3:#1D1842;
  --paper:#F2E7CF;
  --paper-edge:#D9C7A1;
  --paper-ink:#191533;
  --cyan:#2FE8D5;
  --pink:#FF3F9E;
  --amber:#F6B93B;
  --mist:#9A96C4;
  --white:#F6F4FF;

  --rail-w:96px;
  --topbar-h:58px;
  --wrap:1180px;
  --gutter:clamp(18px,4vw,56px);
  --radius:2px;
  --line:rgba(154,150,196,.24);
  --line-soft:rgba(154,150,196,.14);
  --line-strong:rgba(154,150,196,.45);

  --ff-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --ff-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --ff-mono:ui-monospace,"SFMono-Regular","JetBrains Mono","IBM Plex Mono",Menlo,Consolas,"Courier New",monospace;
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  padding-left:var(--rail-w);
  font-family:var(--ff-body);
  font-size:1rem;
  line-height:1.75;
  color:var(--white);
  background-color:var(--ink);
  background-image:
    radial-gradient(900px 520px at 88% -6%, rgba(47,232,213,.11), transparent 60%),
    radial-gradient(760px 460px at 4% 92%, rgba(255,63,158,.10), transparent 62%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--ff-display);font-weight:900;line-height:1.22;letter-spacing:-.01em;color:var(--white);}
#main-content{scroll-margin-top:24px;}

/* ---------- 4. 工具类 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-left:auto;margin-right:auto;padding-left:var(--gutter);padding-right:var(--gutter);}
.wrap--wide{max-width:1380px;}
.prose{max-width:34em;}
.t-mono{font-family:var(--ff-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em;}
.t-lead{font-size:clamp(1.0625rem,1.5vw,1.25rem);line-height:1.8;color:#D6D2EE;}
.t-note{font-size:.8125rem;line-height:1.65;color:var(--mist);}
.u-hidden{display:none !important;}

/* ---------- 5. 跳过链接 ---------- */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:400;
  padding:10px 18px;
  font-family:var(--ff-mono);font-size:.8125rem;letter-spacing:.04em;
  color:var(--ink);background:var(--cyan);
  border-radius:var(--radius);
  transform:translateY(-180%);
  transition:transform .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);}

/* ---------- 6. Header / 左侧品牌轨道 ---------- */
.site-header{
  position:fixed;top:0;left:0;bottom:0;
  z-index:120;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  background:linear-gradient(180deg,#161142 0%,#0E0B28 48%,#0A0820 100%);
  border-right:1px solid var(--line);
  overflow-y:auto;
  overflow-x:hidden;
  scrollbar-width:none;
  isolation:isolate;
}
.site-header::-webkit-scrollbar{width:0;height:0;}
.site-header::after{
  content:"";
  position:absolute;top:0;right:0;width:1px;height:100%;
  background:linear-gradient(180deg,transparent 0%,var(--cyan) 18%,rgba(47,232,213,.18) 58%,transparent 100%);
  pointer-events:none;z-index:3;
}

/* 品牌锁形 */
.rail__brand{
  flex:0 0 auto;
  display:flex;flex-direction:column;align-items:center;gap:12px;
  padding:18px 0 16px;
  border-bottom:1px solid var(--line-soft);
}
.rail__brand-mark{
  font-family:var(--ff-display);font-weight:900;
  font-size:1.375rem;line-height:1;letter-spacing:.06em;
  color:var(--ink);
  background:linear-gradient(140deg,#2FE8D5,#9BF6EC);
  padding:6px 9px 7px;
  border-radius:var(--radius);
  box-shadow:0 0 16px rgba(47,232,213,.45),inset 0 0 0 1px rgba(255,255,255,.35);
}
.rail__brand-name{
  writing-mode:vertical-rl;
  font-size:.6875rem;letter-spacing:.34em;
  color:var(--mist);
}

/* 移动菜单按钮（桌面隐藏） */
.nav-toggle{
  display:none;
  align-items:center;gap:8px;
  padding:8px 10px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  color:var(--white);
  transition:border-color .18s ease,color .18s ease;
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:16px;}
.nav-toggle__bars i{
  display:block;height:2px;width:100%;
  background:var(--cyan);border-radius:2px;
  transition:transform .18s ease,opacity .18s ease;
}
.nav-toggle__label{font-family:var(--ff-mono);font-size:.6875rem;letter-spacing:.08em;color:var(--mist);}
.site-header[data-open="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg);}
.site-header[data-open="true"] .nav-toggle__bars i:nth-child(2){opacity:0;}
.site-header[data-open="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* 主导航轨道 */
.rail{
  flex:1 1 auto;
  display:flex;flex-direction:column;
  min-height:0;
  padding:14px 0 0;
}
.rail__list{
  display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:0 6px;
}
.rail__link{
  position:relative;
  display:flex;flex-direction:row;align-items:center;justify-content:center;
  gap:7px;
  width:100%;
  padding:9px 2px;
  color:var(--mist);
  transition:color .18s ease;
}
.rail__link::before{
  content:"";
  position:absolute;left:0;top:6px;bottom:6px;width:2px;
  background:linear-gradient(180deg,var(--cyan),rgba(47,232,213,.25));
  transform:scaleY(0);transform-origin:top center;
  transition:transform .18s ease;
}
.rail__link:hover,.rail__link:focus-visible{color:var(--white);}
.rail__link:hover::before,
.rail__link:focus-visible::before,
.rail__link[aria-current="page"]::before{transform:scaleY(1);}
.rail__link[aria-current="page"]{color:var(--cyan);}
.rail__idx{
  font-family:var(--ff-mono);font-size:.5rem;line-height:1;letter-spacing:.08em;
  color:rgba(154,150,196,.72);
}
.rail__text{
  writing-mode:vertical-rl;
  font-size:.75rem;font-weight:600;line-height:1;letter-spacing:.22em;
}

/* 轨道底部锚点入口 */
.rail__actions{
  margin-top:auto;
  display:flex;flex-direction:column;gap:8px;
  padding:16px 10px 14px;
}
.rail__cta{
  display:block;
  writing-mode:vertical-rl;
  text-align:center;
  padding:12px 4px;
  font-size:.75rem;font-weight:700;letter-spacing:.3em;
  color:var(--cyan);
  border:1px solid rgba(47,232,213,.42);
  border-radius:var(--radius);
  background:rgba(47,232,213,.06);
  transition:background .18s ease,color .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.rail__cta:hover,.rail__cta:focus-visible{
  background:rgba(47,232,213,.16);
  border-color:var(--cyan);
  box-shadow:0 0 18px rgba(47,232,213,.28);
}
.rail__cta--amber{
  color:var(--amber);
  border-color:rgba(246,185,59,.55);
  background:rgba(246,185,59,.09);
}
.rail__cta--amber:hover,.rail__cta--amber:focus-visible{
  background:rgba(246,185,59,.2);
  border-color:var(--amber);
  box-shadow:0 0 18px rgba(246,185,59,.30);
}

/* 轨道脚注 */
.rail__note,.rail__support{
  flex:0 0 auto;
  padding:0 10px;
  font-family:var(--ff-mono);
  font-size:.5625rem;line-height:1.55;letter-spacing:.06em;
  text-align:center;
  color:rgba(154,150,196,.60);
}
.rail__note{padding-top:12px;border-top:1px solid var(--line-soft);}
.rail__support{padding-bottom:16px;color:rgba(47,232,213,.55);}

/* 滚动进度光带 */
.rail-progress{
  position:absolute;top:0;right:0;
  width:2px;height:100%;
  background:linear-gradient(180deg,var(--cyan),var(--pink));
  transform:scaleY(var(--scroll-ratio,0));
  transform-origin:top center;
  box-shadow:0 0 12px rgba(47,232,213,.65);
  pointer-events:none;
  z-index:4;
  transition:transform .1s linear;
}

/* ---------- 7. Header 移动端 ---------- */
@media (max-width:900px){
  body{padding-left:0;padding-top:var(--topbar-h);background-attachment:scroll;}
  #main-content{scroll-margin-top:calc(var(--topbar-h) + 14px);}

  .site-header{
    inset:0 0 auto 0;
    width:auto;height:var(--topbar-h);
    flex-direction:row;align-items:center;gap:12px;
    padding:0 14px;
    border-right:0;
    border-bottom:1px solid var(--line);
    overflow:visible;
    background:linear-gradient(90deg,#161142 0%,#0C0A26 68%,#0A0820 100%);
  }
  .site-header::after{display:none;}

  .rail__brand{
    flex-direction:row;align-items:center;gap:8px;
    height:34px;
    padding:0 12px 0 0;
    border-bottom:0;
    border-right:1px solid var(--line-soft);
  }
  .rail__brand-mark{font-size:1rem;padding:4px 6px 5px;}
  .rail__brand-name{
    writing-mode:horizontal-tb;
    font-size:.625rem;letter-spacing:.2em;color:var(--mist);
  }

  .nav-toggle{display:flex;margin-left:auto;}
  .rail__note,.rail__support{display:none;}

  .rail{
    position:fixed;
    top:var(--topbar-h);left:0;right:0;
    display:block;
    flex:none;min-height:0;
    padding:12px 16px 20px;
    background:linear-gradient(180deg,#161142 0%,#0A0820 100%);
    border-bottom:1px solid var(--line);
    box-shadow:0 26px 50px rgba(0,0,0,.62);
    max-height:calc(100vh - var(--topbar-h));
    overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-10px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s;
    z-index:130;
  }
  .site-header[data-open="true"] .rail{
    opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0);
  }

  .rail__list{flex-direction:column;align-items:stretch;gap:0;padding:0;}
  .rail__link{
    flex-direction:row;align-items:center;justify-content:space-between;
    gap:12px;width:auto;
    padding:13px 6px;
    border-bottom:1px solid var(--line-soft);
  }
  .rail__link::before{display:none;}
  .rail__link[aria-current="page"]{color:var(--cyan);border-bottom-color:rgba(47,232,213,.5);}
  .rail__text{writing-mode:horizontal-tb;font-size:.9375rem;letter-spacing:.06em;}
  .rail__idx{font-size:.625rem;}

  .rail__actions{
    flex-direction:row;gap:10px;
    margin-top:0;padding:16px 0 0;
  }
  .rail__cta{
    writing-mode:horizontal-tb;
    flex:1 1 0;
    padding:12px 8px;
    font-size:.8125rem;letter-spacing:.14em;
  }

  .rail-progress{
    top:auto;bottom:0;left:0;right:0;
    width:100%;height:2px;
    transform:scaleX(var(--scroll-ratio,0));
    transform-origin:left center;
  }
}

/* 矮视口压缩轨道 */
@media (min-width:901px) and (max-height:760px){
  .rail__note,.rail__support{display:none;}
  .rail__brand{padding:12px 0 10px;}
  .rail__brand-name{font-size:.625rem;letter-spacing:.24em;}
  .rail__link{padding:6px 2px;}
  .rail__cta{padding:9px 4px;letter-spacing:.22em;}
  .rail__actions{padding:12px 10px 10px;}
}

/* ---------- 8. Footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,9vw,128px);
  padding-top:clamp(36px,5vw,64px);
  background:linear-gradient(180deg,rgba(20,16,51,0) 0%,rgba(20,16,51,.86) 22%,#0B0824 100%);
  border-top:1px solid var(--line);
  color:var(--mist);
}
.site-footer::before{
  content:"";
  position:absolute;top:-1px;left:0;
  width:clamp(120px,22vw,280px);height:2px;
  background:linear-gradient(90deg,var(--pink),rgba(255,63,158,0));
}
.footer__inner{
  width:100%;max-width:var(--wrap);
  margin-left:auto;margin-right:auto;
  padding-left:var(--gutter);padding-right:var(--gutter);
  display:grid;
  grid-template-columns:minmax(260px,1.6fr) minmax(140px,.85fr) minmax(140px,.85fr) minmax(220px,1.2fr);
  gap:clamp(26px,3.6vw,52px);
}
.footer__brandblock{min-width:0;}
.footer__brand{display:inline-flex;align-items:center;gap:10px;margin-bottom:18px;}
.footer__brand-mark{
  font-family:var(--ff-display);font-weight:900;font-size:1.0625rem;line-height:1;
  color:var(--ink);
  background:linear-gradient(140deg,#2FE8D5,#9BF6EC);
  padding:6px 8px;
  border-radius:var(--radius);
  box-shadow:0 0 14px rgba(47,232,213,.4);
}
.footer__brand-name{
  font-family:var(--ff-display);font-weight:900;
  font-size:1.0625rem;letter-spacing:.06em;color:var(--white);
}
.footer__statement{
  max-width:32em;
  font-size:.9375rem;line-height:1.8;
  color:#CFCBE8;
}
.footer__slashes{display:flex;gap:6px;margin-top:22px;}
.footer__slashes span{display:block;width:28px;height:4px;transform:skewX(-26deg);}
.footer__slashes span:nth-child(1){background:var(--cyan);}
.footer__slashes span:nth-child(2){background:var(--pink);}
.footer__slashes span:nth-child(3){background:var(--amber);}

.footer__col{min-width:0;}
.footer__heading{
  display:flex;align-items:baseline;gap:8px;
  margin-bottom:16px;padding-bottom:10px;
  font-family:var(--ff-mono);font-weight:500;
  font-size:.75rem;letter-spacing:.14em;
  color:var(--white);
  border-bottom:1px solid var(--line-soft);
}
.footer__heading-idx{font-size:.6875rem;letter-spacing:.08em;color:var(--pink);}
.footer__list{display:flex;flex-direction:column;gap:9px;}
.footer__link{
  position:relative;display:inline-block;
  font-size:.875rem;color:var(--mist);
  transition:color .18s ease;
}
.footer__link::after{
  content:"";
  position:absolute;left:0;bottom:-2px;width:100%;height:1px;
  background:var(--cyan);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .2s ease;
}
.footer__link:hover,.footer__link:focus-visible{color:var(--white);}
.footer__link:hover::after,.footer__link:focus-visible::after{transform:scaleX(1);}

.footer__contact{min-width:0;}
.footer__contact-line{
  font-family:var(--ff-mono);font-size:.875rem;letter-spacing:.03em;
  color:var(--white);
  word-break:break-all;
}
.footer__contact-line + .footer__contact-line{margin-top:4px;}
.footer__contact-note{
  margin-top:12px;
  font-size:.8125rem;line-height:1.7;
  color:rgba(154,150,196,.82);
}
.footer__address{
  margin-top:10px;
  font-size:.8125rem;line-height:1.7;
  color:rgba(154,150,196,.82);
}

.footer__base{
  margin-top:clamp(30px,4vw,52px);
  border-top:1px solid var(--line);
  background:rgba(10,8,32,.62);
}
.footer__base-inner{
  width:100%;max-width:var(--wrap);
  margin-left:auto;margin-right:auto;
  padding:16px var(--gutter);
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  gap:8px 28px;
  font-family:var(--ff-mono);font-size:.75rem;letter-spacing:.03em;
  color:rgba(154,150,196,.78);
}
.footer__icp{white-space:nowrap;}
.footer__copy{}

@media (max-width:1024px){
  .footer__inner{grid-template-columns:1fr 1fr;}
  .footer__brandblock{grid-column:1 / -1;}
  .footer__contact{grid-column:1 / -1;}
}
@media (max-width:640px){
  .footer__inner{grid-template-columns:1fr;}
  .footer__base-inner{flex-direction:column;align-items:flex-start;gap:6px;}
}

/* ---------- 9. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;
  font-family:var(--ff-display);font-weight:700;font-size:.875rem;letter-spacing:.08em;
  color:var(--ink);
  background:var(--cyan);
  border:1px solid transparent;
  border-radius:var(--radius);
  cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease,box-shadow .18s ease,transform .18s ease;
}
.btn:hover,.btn:focus-visible{background:#7CF4E8;box-shadow:0 0 22px rgba(47,232,213,.40);}
.btn:active{transform:translateY(1px);}
.btn--amber{background:var(--amber);color:var(--ink);}
.btn--amber:hover,.btn--amber:focus-visible{background:#FFCD66;box-shadow:0 0 22px rgba(246,185,59,.42);}
.btn--ghost{
  color:var(--white);
  background:transparent;
  border-color:var(--line-strong);
}
.btn--ghost:hover,.btn--ghost:focus-visible{
  color:var(--cyan);
  border-color:var(--cyan);
  background:rgba(47,232,213,.08);
  box-shadow:0 0 18px rgba(47,232,213,.22);
}
.btn--sm{padding:8px 14px;font-size:.8125rem;}

/* ---------- 10. 暖纸卡片 ---------- */
.paper-card{
  position:relative;
  background:var(--paper);
  color:var(--paper-ink);
  border:1px solid var(--paper-edge);
  border-radius:var(--radius);
  padding:clamp(20px,3vw,32px);
  box-shadow:
    6px 6px 0 0 var(--paper-edge),
    12px 12px 0 0 rgba(217,199,161,.22),
    0 18px 38px rgba(0,0,0,.45);
}
.paper-card h2,.paper-card h3,.paper-card h4{color:var(--paper-ink);}
.paper-card p{color:#2A2450;}
.paper-card a{color:#0B6F68;}
.paper-card a:hover,.paper-card a:focus-visible{color:#B01566;}

/* ---------- 11. 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  font-family:var(--ff-mono);font-size:.6875rem;letter-spacing:.06em;line-height:1.5;
  color:var(--cyan);
  border:1px solid rgba(47,232,213,.45);
  border-radius:999px;
  background:rgba(47,232,213,.07);
}
.tag--pink{color:var(--pink);border-color:rgba(255,63,158,.45);background:rgba(255,63,158,.08);}
.tag--amber{color:var(--amber);border-color:rgba(246,185,59,.50);background:rgba(246,185,59,.10);}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--ff-mono);font-size:.75rem;letter-spacing:.03em;
  color:var(--mist);
}
.breadcrumb__item{color:inherit;transition:color .18s ease;}
.breadcrumb__sep{color:rgba(154,150,196,.5);}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--cyan);}

/* ---------- 13. 编号章节头 ---------- */
.section-head{
  display:flex;align-items:flex-end;gap:clamp(12px,2vw,22px);
  margin-bottom:clamp(22px,3vw,36px);
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
}
.section-head__no{
  font-family:var(--ff-mono);font-weight:700;
  font-size:clamp(1.6rem,4vw,2.6rem);line-height:.9;letter-spacing:-.02em;
  color:rgba(47,232,213,.85);
  text-shadow:0 0 18px rgba(47,232,213,.35);
}
@supports (-webkit-text-stroke:1px red){
  .section-head__no{color:transparent;-webkit-text-stroke:1px rgba(47,232,213,.78);text-shadow:none;}
}
.section-head__title{font-size:clamp(1.375rem,2.4vw,1.875rem);color:var(--white);}

/* ---------- 14. 栅格 ---------- */
.grid{display:grid;gap:clamp(18px,2.6vw,32px);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
@media (max-width:820px){
  .grid--2,.grid--3{grid-template-columns:1fr;}
  .grid--12{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:560px){
  .grid--12{grid-template-columns:1fr;}
}

/* ---------- 15. 图片容器基础 ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 10;
  overflow:hidden;
  border-radius:var(--radius);
  border:1px solid var(--line);
  background:linear-gradient(140deg,#1D1842 0%,#12102F 58%,#0D0A24 100%);
}
.media-frame > img,
.media-frame > picture > img,
.media-frame > svg,
.media-frame > video{
  display:block;
  width:100%;height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame--portrait{aspect-ratio:3 / 4;}
.media-frame__badge{position:absolute;top:10px;left:10px;z-index:2;}

/* ---------- 16. 焦点与滚动显现 ---------- */
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px;}

html.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .36s ease,transform .36s cubic-bezier(.22,.68,.32,1);
}
html.js-reveal [data-reveal].is-revealed{opacity:1;transform:none;}

/* ---------- 17. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  .skip-link,.nav-toggle,.nav-toggle__bars i,
  .rail__link,.rail__link::before,.rail__cta,
  .footer__link,.footer__link::after,
  .btn,.rail-progress,.rail{border-radius:2px;}
  .skip-link,.rail__cta,.btn,.footer__link,.rail__link{transition:none;}
  .rail__link::before{transition:none;}
  .footer__link::after{transition:none;}
  .rail-progress{transition:none;}
  html.js-reveal [data-reveal]{opacity:1;transform:none;transition:opacity .2s linear;}
}