/* =========================================================
   7安装游戏 · /assets/site.css
   共享层：重置、变量、中文排版、页头、页脚、通用组件
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink-900:#05070E;
  --panel:#0B1220;
  --panel-2:#0E1728;
  --grid:#1B2A44;
  --cyan:#22E0FF;
  --violet:#A855F7;
  --flare:#FF5A1F;
  --white:#E8F1FF;
  --dim:#93A6C4;
  --mint:#3BE8A5;
  --warn:#FFC24B;

  --rail-h:34px;
  --nav-h:62px;
  --header-total:calc(var(--rail-h) + var(--nav-h));
  --max:1280px;
  --gutter:clamp(16px,4vw,32px);
  --radius:2px;
  --line:1px solid var(--grid);

  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --fs-display:clamp(2.6rem,6vw,5rem);
  --fs-h2:clamp(1.5rem,2.6vw,1.8rem);
  --fs-h3:1.15rem;
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd,dt{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}
::selection{background:var(--cyan);color:#04121A}

/* ---------- 3. 中文排版与基础节奏 ---------- */
body{
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 560px at 80% -12%, rgba(34,224,255,.10), transparent 62%),
    radial-gradient(900px 520px at 6% 108%, rgba(168,85,247,.10), transparent 62%),
    linear-gradient(to right, rgba(27,42,68,.50) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(27,42,68,.50) 1px, transparent 1px);
  background-size:auto, auto, 48px 48px, 48px 48px;
  background-repeat:no-repeat, no-repeat, repeat, repeat;
  color:var(--white);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:500;
  line-height:1.75;
  letter-spacing:.01em;
}

main{padding-top:var(--header-total)}

h1,h2,h3,h4{font-weight:900;line-height:1.18;letter-spacing:-.02em}
h1{font-size:var(--fs-display)}
h2{font-size:var(--fs-h2)}
h3{font-size:var(--fs-h3)}
h4{font-size:1rem;letter-spacing:0}
p{max-width:64ch}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.dim{color:var(--dim)}

/* ---------- 4. 布局容器 ---------- */
.container{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(48px,7vw,96px);border-top:var(--line)}
.section:first-of-type{border-top:0}
.section__head{display:flex;align-items:baseline;flex-wrap:wrap;gap:14px;margin-bottom:clamp(20px,3vw,34px)}
.section__index{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--cyan);border:1px solid var(--grid);padding:3px 8px;
}
.eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--violet);
}
.rule{height:1px;border:0;background:var(--grid);margin-block:clamp(24px,4vw,40px)}

.grid{display:grid;gap:clamp(16px,2.4vw,24px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:960px){.grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}}

/* ---------- 5. 面板 / 标签 / 状态 ---------- */
.panel{
  background:var(--panel);
  border:var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,28px);
  transition:border-color .2s ease,transform .2s ease;
}
.panel:hover{border-color:rgba(34,224,255,.5)}
.panel--accent{border-left:3px solid var(--cyan);border-radius:0}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;
  padding:3px 8px;border:1px solid var(--grid);color:var(--dim);border-radius:var(--radius);
}
.tag--cyan{color:var(--cyan);border-color:rgba(34,224,255,.45);background:rgba(34,224,255,.07)}
.tag--violet{color:var(--violet);border-color:rgba(168,85,247,.45);background:rgba(168,85,247,.08)}

.status-chip{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--mint);
}
.status-chip--warn{color:var(--warn)}

.dot{width:7px;height:7px;background:var(--mint);display:inline-block;flex:none;animation:dotPulse 2.4s ease-in-out infinite}
.dot--ready{background:var(--mint);box-shadow:0 0 8px rgba(59,232,165,.6)}
.dot--warn{background:var(--warn);box-shadow:0 0 8px rgba(255,194,75,.6)}
@keyframes dotPulse{0%,100%{opacity:1}50%{opacity:.35}}

/* ---------- 6. 动作按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;border:1px solid var(--grid);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;
  color:var(--white);background:transparent;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease,transform .18s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--flare);border-color:var(--flare);color:#0A0503}
.btn--primary:hover{background:#FF7440;border-color:#FF7440}
.btn--ghost{border-color:rgba(34,224,255,.5);color:var(--cyan);background:rgba(34,224,255,.06)}
.btn--ghost:hover{border-color:var(--cyan);background:rgba(34,224,255,.14)}

/* ---------- 7. 正文容器 / 面包屑 ---------- */
.prose{max-width:68ch;font-size:17px;line-height:1.75}
.prose p{max-width:68ch}
.prose p + p{margin-top:1em}
.prose h2{margin-top:1.6em;margin-bottom:.5em}
.prose h3{margin-top:1.4em;margin-bottom:.4em}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(34,224,255,.4)}
.prose a:hover{border-bottom-color:var(--cyan)}
.prose ul,.prose ol{display:grid;gap:.5em;margin-top:.9em}
.prose li{position:relative;padding-left:18px;color:var(--dim)}
.prose li::before{content:"";position:absolute;left:0;top:.8em;width:6px;height:1px;background:var(--cyan)}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--dim);
}
.breadcrumbs a{transition:color .18s ease}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs__sep{color:var(--grid)}
.breadcrumbs [aria-current="page"]{color:var(--white)}

/* ---------- 8. 图像容器基础规则（页面阶段放置图片） ---------- */
.img-frame{
  position:relative;display:block;overflow:hidden;
  border:var(--line);border-radius:var(--radius);
  background:linear-gradient(155deg,var(--panel) 0%,#070C16 100%);
  aspect-ratio:16 / 10;
}
.img-frame > img,
.img-frame > svg{width:100%;height:100%;object-fit:cover}
.img-frame--phone{aspect-ratio:9 / 19;max-width:340px}
.img-frame--wide{aspect-ratio:21 / 9}
.img-frame::after{
  content:"";position:absolute;top:0;right:0;width:14px;height:14px;
  border-top:2px solid var(--cyan);border-right:2px solid var(--cyan);opacity:.65;
}
.img-frame__cap{
  position:absolute;left:0;bottom:0;width:100%;
  padding:10px 12px;background:rgba(5,7,14,.86);border-top:var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--dim);
}

/* ---------- 9. 锚点导航 ---------- */
.anchor-nav{
  display:flex;gap:8px;overflow-x:auto;padding-bottom:8px;
  scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch;
}
.anchor-nav a{
  flex:none;scroll-snap-align:start;
  padding:7px 12px;border:1px solid var(--grid);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--dim);
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.anchor-nav a:hover,.anchor-nav a[aria-current="true"]{
  color:var(--cyan);border-color:rgba(34,224,255,.5);background:rgba(34,224,255,.08);
}

/* ---------- 10. 显现协议 ---------- */
.js [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 11. 跳转链接 ---------- */
.skip-link{
  position:fixed;left:12px;top:-72px;z-index:300;
  padding:10px 16px;background:var(--flare);color:#0A0503;
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.06em;
  transition:top .18s ease;
}
.skip-link:focus{top:10px}

/* ---------- 12. 页头 ---------- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100}

.status-rail{background:#070B14;border-bottom:var(--line)}
.status-rail__inner{
  max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter);
  height:var(--rail-h);display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.status-rail__ver{
  display:flex;align-items:center;gap:12px;min-width:0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;font-variant-numeric:tabular-nums;
}
.ver-badge{
  padding:2px 8px;white-space:nowrap;
  color:var(--flare);border:1px solid rgba(255,90,31,.55);background:rgba(255,90,31,.08);
  font-weight:700;
}
.status-rail__state{display:inline-flex;align-items:center;gap:6px;color:var(--mint);white-space:nowrap}

.quick-nav{display:flex;align-items:center;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em}
.quick-nav__item{border-left:var(--line);padding-left:14px;margin-left:14px}
.quick-nav__item:first-child{border-left:0;padding-left:0;margin-left:0}
.quick-nav__link{color:var(--dim);transition:color .18s ease}
.quick-nav__link:hover{color:var(--cyan)}

.nav-bar{
  background:transparent;border-bottom:1px solid transparent;
  transition:background-color .28s ease,border-color .28s ease;
}
.site-header[data-scrolled] .nav-bar{
  background:rgba(11,18,32,.94);
  border-bottom-color:var(--grid);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}
.nav-bar__inner{
  max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter);
  height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:20px;
}

.brand{display:inline-flex;align-items:center;gap:10px;flex:none}
.brand__mark{
  width:30px;height:30px;display:grid;place-items:center;
  background:var(--flare);color:#0A0503;border-radius:var(--radius);
  font-family:var(--font-mono);font-size:16px;font-weight:700;
}
.brand__text{font-size:17px;font-weight:900;letter-spacing:-.01em;transition:color .18s ease}
.brand:hover .brand__text{color:var(--cyan)}

.primary-nav{display:block}
.primary-nav__list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 12px;border:1px solid transparent;border-radius:var(--radius);
  font-size:14px;font-weight:500;color:var(--dim);white-space:nowrap;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.nav-link__idx{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:#3F5C8A;transition:color .18s ease}
.nav-link:hover{color:var(--white);border-color:rgba(34,224,255,.45);background:rgba(34,224,255,.06)}
.nav-link:hover .nav-link__idx{color:var(--cyan)}
.nav-link[aria-current="page"]{color:var(--cyan);border-color:rgba(34,224,255,.5);background:rgba(34,224,255,.08)}
.nav-link[aria-current="page"] .nav-link__idx{color:var(--violet)}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;border:1px solid var(--grid);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--dim);
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan);background:rgba(34,224,255,.08)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px}
.nav-toggle__bars span{display:block;width:16px;height:2px;background:currentColor}

.scroll-progress{height:2px;background:transparent;overflow:hidden}
.scroll-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--violet))}

/* ---------- 13. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(48px,7vw,96px);
  padding-top:clamp(40px,6vw,72px);
  background:#06090F;border-top:var(--line);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;width:100%;height:1px;
  background:linear-gradient(90deg,var(--cyan),transparent 42%,transparent 58%,var(--violet));
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:clamp(24px,4vw,48px)}
@media (max-width:1000px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:600px){.footer-grid{grid-template-columns:minmax(0,1fr)}}

.footer-col__title{
  display:flex;align-items:center;gap:10px;margin-bottom:16px;
  font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:var(--cyan);line-height:1.4;
}
.footer-col__title::after{content:"";flex:1;height:1px;background:var(--grid)}

.brand--footer{margin-bottom:14px}
.footer-tagline{font-size:15px;line-height:1.7;color:var(--white);max-width:34ch}
.footer-note{
  margin-top:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--dim);
}

.footer-links{display:grid;gap:10px}
.footer-links__item{line-height:1.4}
.footer-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:15px;color:var(--dim);
  transition:color .18s ease;
}
.footer-link::before{content:"";width:6px;height:1px;background:var(--grid);transition:background-color .18s ease,width .18s ease}
.footer-link:hover{color:var(--cyan)}
.footer-link:hover::before{background:var(--cyan);width:12px}

.footer-contact{display:grid;gap:10px;font-size:14px}
.footer-contact__row{display:grid;grid-template-columns:74px 1fr;gap:10px}
.footer-contact__row dt{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:#6E86AB;padding-top:2px;
}
.footer-contact__row dd{color:var(--white);word-break:break-word}

.footer-meta{
  margin-top:clamp(32px,5vw,56px);border-top:var(--line);background:#04060C;
}
.footer-meta__inner{padding-block:16px 28px}
.meta-table{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.meta-table__row{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px;
  padding:10px 0;border-bottom:1px solid rgba(27,42,68,.7);
}
.meta-table__row dt{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:#6E86AB;white-space:nowrap;
}
.meta-table__row dd{color:var(--dim);font-size:13px;word-break:break-word}

/* ---------- 14. 响应式：平板与手机 ---------- */
@media (max-width:960px){
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:fixed;left:0;right:0;top:var(--header-total);
    display:none;max-height:calc(100vh - var(--header-total));overflow-y:auto;
    padding:10px var(--gutter) 22px;
    background:var(--panel);border-bottom:1px solid var(--cyan);
  }
  .primary-nav[data-open]{display:block}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    width:100%;justify-content:flex-start;
    padding:14px 10px;border:0;border-bottom:var(--line);border-radius:0;
    color:var(--white);font-size:15px;
  }
  .nav-link[aria-current="page"]{background:rgba(34,224,255,.08);border-bottom-color:rgba(34,224,255,.4)}
  html.nav-open{overflow:hidden}
}

@media (max-width:640px){
  body{font-size:16px}
  .quick-nav{display:none}
  .status-rail__ver{gap:8px}
  .img-frame--phone{max-width:100%}
}

/* ---------- 15. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js [data-reveal]{opacity:1 !important;transform:none !important}
  .btn:hover{transform:none}
}