/* MG游戏站 — /assets/site.css — 共享外壳与基础组件 */

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:140px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
[hidden]{display:none !important}

:root{
  --bg:#060B1E;
  --surface:#0C1533;
  --surface-2:#101B3D;
  --edge:#1E2C5A;
  --cyan:#22E0FF;
  --violet:#8B5CFF;
  --orange:#FF7A2F;
  --text:#EAF2FF;
  --muted:#93A3C4;
  --mint:#4BE3A2;
  --amber:#FFC24B;
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:var(--font-display);
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --maxw:1180px;
  --gutter:clamp(16px,4vw,40px);
  --cut:18px;
  --dur:.22s;
  --ease:cubic-bezier(.2,.7,.3,1);
}

body{
  min-height:100vh;
  background-color:var(--bg);
  background-image:
    radial-gradient(900px 520px at 84% -10%, rgba(139,92,255,.20), transparent 62%),
    radial-gradient(760px 460px at 4% 2%, rgba(34,224,255,.13), transparent 60%);
  background-repeat:no-repeat;
  color:var(--text);
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.18;letter-spacing:-.02em;color:var(--text)}
h1{font-size:clamp(36px,6vw,64px)}
h2{font-size:clamp(26px,3.6vw,34px)}
h3{font-size:clamp(20px,2.4vw,22px);letter-spacing:-.01em}
p{max-width:40em}
strong{color:#fff}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
#main-content{display:block}
#main-content:focus{outline:none}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:-120px;left:16px;z-index:300;
  display:inline-block;padding:10px 18px;
  background:var(--cyan);color:#04101F;font-weight:700;font-size:14px;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 布局容器 ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{position:relative;padding-block:clamp(56px,8vw,96px)}
.section__head{display:grid;gap:10px;margin-bottom:clamp(24px,4vw,40px)}
.section__title{font-size:clamp(26px,3.6vw,34px)}
.section__lead{color:var(--muted);font-size:15px;max-width:46ch}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:1px;background:linear-gradient(90deg,var(--cyan),transparent)}

.mono{
  font-family:var(--font-mono);
  font-size:12.5px;letter-spacing:.08em;
  font-variant-numeric:tabular-nums;
}

/* ---------- 刊头 ---------- */
.masthead{
  position:sticky;top:0;z-index:80;
  background:linear-gradient(180deg, rgba(6,11,30,.97), rgba(7,13,34,.90));
  border-bottom:1px solid var(--edge);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
}
.masthead::before{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan) 16%,var(--violet) 52%,var(--orange) 88%,transparent);
  opacity:.9;pointer-events:none;
}
.masthead__frame{
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding:12px var(--gutter) 10px;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;
  transition:padding .24s var(--ease);
}
.masthead__batch{
  display:flex;align-items:center;gap:8px;
  font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);
  transition:opacity .2s var(--ease);
}
.masthead__dot{
  width:7px;height:7px;flex:0 0 auto;
  background:var(--mint);
  box-shadow:0 0 10px rgba(75,227,162,.85);
  clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%);
}
.brand{
  grid-column:2;justify-self:center;
  display:inline-grid;grid-template-columns:auto auto;align-items:center;
  column-gap:9px;row-gap:1px;justify-items:start;
}
.brand__mark{
  width:18px;height:18px;
  background:linear-gradient(135deg,var(--cyan),var(--violet));
  clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%);
  box-shadow:0 0 18px rgba(34,224,255,.55);
  transition:width .22s var(--ease),height .22s var(--ease);
}
.brand__name{
  font-size:clamp(19px,2.4vw,28px);font-weight:900;letter-spacing:-.03em;line-height:1.06;
  color:var(--text);text-shadow:0 0 26px rgba(34,224,255,.28);
  transition:font-size .22s var(--ease);
}
.brand__sub{
  grid-column:1 / -1;
  font-size:9.5px;line-height:1.4;letter-spacing:.32em;color:rgba(147,163,196,.85);
  transition:opacity .2s var(--ease);
}
.masthead__actions{
  grid-column:3;display:flex;align-items:center;justify-content:flex-end;gap:10px;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;
  font-family:var(--font-display);font-weight:700;font-size:15px;line-height:1;
  border:1px solid var(--edge);background:transparent;color:var(--text);
  cursor:pointer;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:transform var(--dur) var(--ease),background var(--dur),border-color var(--dur),color var(--dur),box-shadow var(--dur);
}
.btn:hover{transform:translateY(-2px)}
.btn--accent{
  background:linear-gradient(135deg,#FF9A4D,var(--orange) 58%,#F2611B);
  border-color:transparent;color:#1A0A02;
  box-shadow:0 12px 26px -16px rgba(255,122,47,.95);
}
.btn--accent:hover{box-shadow:0 16px 32px -14px rgba(255,122,47,1)}
.btn--line{border-color:rgba(34,224,255,.5);color:var(--cyan);background:rgba(34,224,255,.04)}
.btn--line:hover{background:rgba(34,224,255,.12)}
.btn--ghost{color:var(--muted)}
.btn--ghost:hover{color:var(--text);border-color:rgba(34,224,255,.45)}
.masthead__cta{font-size:14px;padding:11px 18px}

/* ---------- 导航 ---------- */
.nav{
  width:100%;max-width:var(--maxw);margin-inline:auto;
  border-top:1px solid rgba(30,44,90,.7);
}
.nav__list{
  counter-reset:nav;
  display:flex;flex-wrap:wrap;justify-content:center;gap:clamp(2px,.8vw,8px);
  padding:4px var(--gutter) 8px;
}
.nav__item{counter-increment:nav}
.nav__link{
  position:relative;
  display:inline-flex;align-items:baseline;gap:6px;
  padding:9px 14px 11px;
  font-size:15px;font-weight:500;color:var(--muted);
  clip-path:polygon(6px 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%,0 6px);
  transition:color .18s var(--ease),background .18s var(--ease),padding .22s var(--ease),font-size .22s var(--ease);
}
.nav__link::before{
  content:counter(nav,decimal-leading-zero);
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.06em;
  color:rgba(147,163,196,.55);position:relative;top:-4px;
  transition:color .18s;
}
.nav__link:hover{color:var(--text);background:rgba(34,224,255,.08)}
.nav__link[aria-current="page"]{
  color:var(--cyan);
  background:linear-gradient(180deg,rgba(34,224,255,.16),rgba(34,224,255,0));
}
.nav__link[aria-current="page"]::before{color:var(--cyan)}
.nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:14px;right:14px;bottom:0;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  box-shadow:0 0 12px rgba(34,224,255,.75);
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 12px;
  background:rgba(34,224,255,.06);
  border:1px solid rgba(34,224,255,.35);
  color:var(--cyan);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  cursor:pointer;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
  transition:background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(34,224,255,.15);border-color:rgba(34,224,255,.6)}
.nav-toggle__icon{display:grid;gap:3px;width:15px}
.nav-toggle__bar{
  display:block;width:100%;height:2px;border-radius:1px;background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__text{line-height:1}

/* ---------- 滚动进度轨 ---------- */
.masthead__rail{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  overflow:hidden;background:rgba(30,44,90,.5);pointer-events:none;
}
.masthead__rail-fill{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 62%,var(--orange));
  transition:transform .12s linear;
}

/* ---------- 刊头收窄态 ---------- */
.masthead[data-condensed] .masthead__frame{padding:7px var(--gutter) 6px}
.masthead[data-condensed] .masthead__batch{opacity:0}
.masthead[data-condensed] .brand__name{font-size:18px}
.masthead[data-condensed] .brand__mark{width:13px;height:13px}
.masthead[data-condensed] .brand__sub{opacity:0}
.masthead[data-condensed] .nav__link{padding:7px 12px;font-size:13.5px}
.masthead[data-condensed] .masthead__cta{padding:9px 15px;font-size:13px}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding:16px 0 0}
.breadcrumb__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item--current{color:var(--text)}
.breadcrumb__link{color:var(--muted);transition:color .18s}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__sep{color:rgba(30,44,90,1);font-size:11px}

/* ---------- 切角面板 ---------- */
.panel{
  position:relative;padding:1px;
  background:linear-gradient(150deg,rgba(34,224,255,.38),rgba(30,44,90,.6) 46%,rgba(139,92,255,.32));
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.panel::before{
  content:"";position:absolute;inset:1px;z-index:0;
  background:linear-gradient(168deg,var(--surface),#0A1230 72%);
  clip-path:inherit;
}
.panel > *{position:relative;z-index:1}
.panel__inner{padding:clamp(18px,3vw,28px)}
.panel--lift{transition:transform var(--dur) var(--ease),filter var(--dur) var(--ease)}
.panel--lift:hover{transform:translateY(-4px);filter:brightness(1.07) drop-shadow(0 20px 32px rgba(4,8,22,.8))}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--8-4{grid-template-columns:8fr 4fr}
.grid--2{grid-template-columns:repeat(2,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  border:1px solid var(--edge);color:var(--muted);background:rgba(12,21,51,.75);
  clip-path:polygon(6px 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%,0 6px);
}
.tag--cyan{color:var(--cyan);border-color:rgba(34,224,255,.45);background:rgba(34,224,255,.08)}
.tag--mint{color:var(--mint);border-color:rgba(75,227,162,.42);background:rgba(75,227,162,.08)}
.tag--amber{color:var(--amber);border-color:rgba(255,194,75,.42);background:rgba(255,194,75,.08)}
.tag--orange{color:var(--orange);border-color:rgba(255,122,47,.45);background:rgba(255,122,47,.09)}

/* ---------- 图像容器 ---------- */
.media{
  position:relative;overflow:hidden;
  aspect-ratio:16 / 10;
  border:1px solid var(--edge);
  background-color:var(--surface);
  background-image:
    radial-gradient(120% 90% at 16% 10%, rgba(34,224,255,.24), transparent 58%),
    radial-gradient(110% 90% at 88% 92%, rgba(139,92,255,.28), transparent 60%),
    linear-gradient(150deg,#0B1430,#070D22);
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(234,242,255,.05) 0 1px,transparent 1px 4px);
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:4 / 5}
.media__caption{
  display:block;padding-top:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--muted);
}

/* ---------- 标签页 ---------- */
.tabs{display:grid;gap:18px}
.tabs__list{
  display:flex;flex-wrap:wrap;gap:2px;
  border-bottom:1px solid var(--edge);
}
.tabs__tab{
  appearance:none;-webkit-appearance:none;
  background:transparent;border:0;border-bottom:2px solid transparent;
  padding:10px 16px;cursor:pointer;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--muted);
  transition:color .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}
.tabs__tab:hover{color:var(--text);background:rgba(34,224,255,.07)}
.tabs__tab[aria-selected="true"]{
  color:var(--cyan);border-bottom-color:var(--cyan);
  background:linear-gradient(180deg,rgba(34,224,255,.12),rgba(34,224,255,0));
}
.tabs__panel{padding-top:18px}
.tabs__panel[hidden]{display:none}

/* ---------- 索引与注记 ---------- */
.index-rail{
  display:grid;gap:2px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
}
.index-rail__item{
  display:flex;gap:10px;align-items:center;
  padding:6px 0 6px 12px;
  border-left:1px solid var(--edge);
  color:var(--muted);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.index-rail__item:hover,
.index-rail__item[aria-current="true"]{color:var(--cyan);border-left-color:var(--cyan)}
.index-rail__index{color:rgba(147,163,196,.65)}
.rail-label{
  writing-mode:vertical-rl;
  display:inline-block;padding-block:8px;
  border-left:1px solid rgba(34,224,255,.35);
  padding-left:8px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.32em;text-transform:uppercase;
  color:rgba(147,163,196,.85);
}

/* ---------- 正文 ---------- */
.prose{max-width:38em;font-size:16.5px;line-height:1.8;color:rgba(234,242,255,.93)}
.prose > * + *{margin-top:1.05em}
.prose h2,.prose h3{margin-top:1.9em}
.prose ul,.prose ol{display:grid;gap:.5em;padding-left:1.15em;list-style:disc}
.prose ol{list-style:decimal}
.prose a{color:var(--cyan);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.prose code{
  font-family:var(--font-mono);font-size:.9em;
  padding:2px 6px;border:1px solid var(--edge);background:rgba(12,21,51,.9);color:var(--cyan);
}
.prose blockquote{
  border-left:2px solid var(--violet);padding-left:16px;color:var(--muted);
}

/* ---------- 显现动效 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(64px,10vw,120px);
  border-top:1px solid var(--edge);
  background-color:#05091A;
  background-image:
    radial-gradient(720px 320px at 10% 0%, rgba(34,224,255,.12), transparent 62%),
    radial-gradient(760px 380px at 90% 16%, rgba(139,92,255,.16), transparent 66%),
    linear-gradient(180deg,#070D22,#05091A);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(34,224,255,.75),rgba(139,92,255,.75),rgba(255,122,47,.6),transparent);
  pointer-events:none;
}
.site-footer__inner{
  max-width:var(--maxw);margin-inline:auto;
  padding:clamp(40px,6vw,64px) var(--gutter) 28px;
}
.footer__grid{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.35fr;
  gap:clamp(24px,4vw,48px);
}
.footer__col{min-width:0}
.footer__col--brand{display:grid;align-content:start;gap:0}
.footer__brand{
  display:inline-block;
  font-family:var(--font-display);font-size:22px;font-weight:900;letter-spacing:-.02em;color:var(--text);
}
.footer__brand::after{
  content:"";display:block;width:46px;height:2px;margin-top:10px;
  background:linear-gradient(90deg,var(--cyan),var(--violet),var(--orange));
}
.footer__lead{color:var(--muted);font-size:14.5px;line-height:1.7;max-width:26ch;margin-top:14px}
.footer__batch{margin-top:16px;font-size:10.5px;letter-spacing:.2em;color:rgba(147,163,196,.75)}
.footer__title{
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);
  margin-bottom:16px;
}
.footer__list{display:grid;gap:10px}
.footer__link{
  display:inline-flex;align-items:center;gap:0;
  color:var(--muted);font-size:14.5px;
  transition:color .18s var(--ease),gap .18s var(--ease);
}
.footer__link::before{
  content:"";display:block;width:0;height:1px;background:var(--cyan);
  transition:width .18s var(--ease),margin-right .18s var(--ease);
}
.footer__link:hover{color:var(--text)}
.footer__link:hover::before{width:14px;margin-right:8px}
.footer__list--contact{gap:12px}
.footer__contact{font-size:13.5px;color:var(--muted);word-break:break-word;line-height:1.6}
.footer__contact--note{font-size:12.5px;color:rgba(147,163,196,.78)}
.footer__bottom{
  margin-top:clamp(32px,5vw,52px);padding-top:20px;
  border-top:1px solid rgba(30,44,90,.85);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
}
.footer__legal{font-size:11px;letter-spacing:.1em;color:rgba(147,163,196,.82)}
.footer__legal-links{display:flex;flex-wrap:wrap;gap:18px}
.footer__legal-links .footer__link{font-size:12.5px}

/* ---------- 平板 ---------- */
@media (max-width:1040px){
  .footer__grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:900px){
  .masthead__frame{
    grid-template-columns:1fr auto;gap:10px;
    padding:10px var(--gutter) 9px;
  }
  .masthead__batch{display:none}
  .brand{
    grid-column:1;justify-self:start;
    column-gap:8px;
  }
  .brand__name{font-size:20px}
  .brand__sub{font-size:8.5px;letter-spacing:.24em}
  .masthead__actions{grid-column:2}
  .nav-toggle{display:inline-flex}
  .nav{
    max-height:0;overflow:hidden;
    border-top-color:transparent;
    transition:max-height .3s var(--ease),border-color .2s var(--ease);
  }
  .nav[data-open]{
    max-height:min(72vh,560px);overflow-y:auto;
    border-top-color:var(--edge);
  }
  .nav__list{flex-direction:column;align-items:stretch;gap:2px;padding:8px var(--gutter) 14px}
  .nav__link{width:100%;justify-content:flex-start;padding:12px 14px;font-size:15.5px}
  .nav__link[aria-current="page"]::after{left:14px;right:auto;width:26px;bottom:6px}
  .masthead[data-condensed] .nav__link{padding:12px 14px;font-size:15.5px}
  .masthead[data-condensed] .masthead__frame{padding:8px var(--gutter) 7px}
  .grid--7-5,.grid--8-4,.grid--2,.grid--3{grid-template-columns:1fr}
}
@media (max-width:620px){
  body{font-size:16px}
  .masthead__cta{font-size:12.5px;padding:9px 12px}
  .masthead[data-condensed] .masthead__cta{font-size:12.5px;padding:9px 12px}
  .nav-toggle__text{display:none}
  .nav-toggle{padding:10px}
  .brand__sub{display:none}
  .footer__grid{grid-template-columns:1fr;gap:28px}
  .footer__bottom{flex-direction:column;align-items:flex-start}
  .footer__lead{max-width:none}
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .btn:hover,.panel--lift:hover{transform:none}
  [data-reveal]{opacity:1;transform:none}
  .nav{max-height:none}
}