/* =========================================================
   58买球CN官网入口导航 — 共享样式 /assets/site.css
   夜间导航台 · 侧边轨道 · 操作手册语言
   ========================================================= */

:root{
  --ink-950:#04111F;
  --ink-900:#071A2B;
  --ink-800:#0D2940;
  --orange:#FF6A1A;
  --orange-300:#FFB27A;
  --cyan:#2DE2E6;
  --cyan-700:#0E7C86;
  --paper:#F7F2E8;
  --line-200:#D8DEE4;
  --ok:#3ED598;
  --alert:#E5484D;

  --line:rgba(216,222,228,.16);
  --line-strong:rgba(216,222,228,.32);
  --muted:rgba(247,242,232,.62);

  --rail-w:276px;
  --gutter:clamp(1.15rem,4vw,4.5rem);
  --maxw:1180px;

  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","Noto Sans Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --shadow-hard:6px 6px 0 rgba(45,226,230,.22);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
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,picture{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
::selection{background:var(--orange);color:var(--ink-950)}

/* ---------- base ---------- */
html{scroll-behavior:smooth}
body{
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1200px 620px at 100% -12%,rgba(45,226,230,.10),transparent 62%),
    radial-gradient(900px 520px at -5% 108%,rgba(255,106,26,.09),transparent 60%),
    repeating-linear-gradient(90deg,rgba(216,222,228,.045) 0 1px,transparent 1px 96px);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.02;
  letter-spacing:.005em;
}
h1{font-size:clamp(2.4rem,6vw,5rem)}
h2{font-size:clamp(1.7rem,3.4vw,2.9rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.5rem);line-height:1.15}
h4{font-size:clamp(1rem,1.4vw,1.15rem);line-height:1.2}
p{max-width:68ch}
main [id]{scroll-margin-top:5.5rem}
strong{font-weight:700;color:var(--paper)}

/* ---------- utilities ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:820px}
.section{padding-block:clamp(2.5rem,6vw,5rem)}
.stack>*+*{margin-top:1rem}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.08em}
.hairline{height:1px;border:0;background:var(--line)}
.eyebrow{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;color:var(--cyan);text-transform:uppercase}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--orange);flex:0 0 auto}
.display-xl{font-family:var(--font-display);font-weight:900;font-size:clamp(3rem,9vw,8rem);line-height:.92;letter-spacing:-.01em}
.grid{display:grid;gap:clamp(1rem,2vw,1.75rem)}
.grid-2,.grid-3{grid-template-columns:1fr}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:.6rem;left:.6rem;z-index:200;
  transform:translateY(-220%);
  padding:.6rem 1rem;border-radius:2px;
  background:var(--cyan);color:var(--ink-950);
  font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.12em;
  transition:transform .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:none}

/* ---------- header / side rail ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:linear-gradient(180deg,rgba(7,26,43,.98),rgba(4,17,31,.96));
  border-bottom:1px solid var(--line-strong);
  box-shadow:0 14px 34px -22px rgba(0,0,0,.95);
}
.rail-inner{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  align-items:center;
  gap:.55rem .75rem;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:.7rem 1rem;
}
.rail-status{display:none}
.status-dot{
  flex:0 0 auto;width:7px;height:7px;border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(45,226,230,.18);
  animation:pulse 2.6s infinite;
}
.brand{display:flex;align-items:center;gap:.65rem;min-width:0}
.brand-mark{
  flex:0 0 auto;width:38px;height:38px;
  display:grid;place-items:center;
  background:var(--orange);color:var(--ink-950);
  font-family:var(--font-display);font-weight:900;font-size:1.02rem;letter-spacing:-.02em;
  box-shadow:3px 3px 0 var(--cyan-700);
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{
  font-family:var(--font-display);font-weight:900;font-size:1rem;line-height:1.15;letter-spacing:.01em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.brand-desc{
  font-family:var(--font-mono);font-size:10px;line-height:1.5;letter-spacing:.14em;color:var(--muted);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.nav-toggle{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.52rem .7rem;border:1px solid var(--line-strong);border-radius:2px;
  background:rgba(13,41,64,.85);color:var(--paper);
  transition:border-color .18s var(--ease),color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{display:flex;flex-direction:column;justify-content:center;gap:4px;width:16px}
.nav-toggle-bars span{display:block;height:2px;background:currentColor;transition:transform .22s var(--ease),opacity .22s var(--ease)}
.nav-toggle-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em}
.site-header[data-open] .nav-toggle{border-color:var(--orange);color:var(--orange-300)}
.site-header[data-open] .nav-toggle-bars span:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars span:last-child{transform:translateY(-3px) rotate(-45deg)}

.site-nav{
  grid-column:1 / -1;
  display:none;
  padding-top:.6rem;
  border-top:1px solid var(--line);
}
.site-header[data-open] .site-nav{
  display:block;
  max-height:calc(100vh - 6rem);
  overflow-y:auto;
  overscroll-behavior:contain;
  animation:rail-in .22s var(--ease);
}
.nav-list{display:flex;flex-direction:column}
.nav-item{border-bottom:1px solid rgba(216,222,228,.08)}
.nav-item:last-child{border-bottom:0}
.nav-link{
  display:flex;align-items:baseline;gap:.7rem;
  padding:.7rem .25rem .7rem .6rem;
  border-left:2px solid transparent;
  color:rgba(247,242,232,.74);
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-index{font-size:11px;letter-spacing:.16em;color:rgba(216,222,228,.45);transition:color .18s var(--ease)}
.nav-label{font-family:var(--font-display);font-weight:700;font-size:1rem;letter-spacing:.02em}
.nav-link:hover,.nav-link:focus-visible{color:var(--cyan);border-left-color:var(--orange)}
.nav-link:hover .nav-index{border-color:var(--orange);color:var(--orange)}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  border-left-color:var(--orange);
  background:linear-gradient(90deg,rgba(45,226,230,.14),transparent 72%);
}
.nav-link[aria-current="page"] .nav-index{color:var(--orange)}
.nav-link[aria-current="page"] .nav-label{color:var(--cyan);font-weight:900}

.rail-foot{
  grid-column:1 / -1;
  display:none;
  padding-top:.85rem;margin-top:.3rem;
  border-top:1px solid var(--line);
}
.site-header[data-open] .rail-foot{display:grid;gap:.6rem}
.rail-note{
  font-family:var(--font-mono);font-size:11px;line-height:1.7;letter-spacing:.06em;color:var(--muted);
}
.rail-note-sub{display:block;color:rgba(216,222,228,.45);letter-spacing:.12em}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.55rem;
  padding:.7rem 1.1rem;border:1px solid transparent;border-radius:2px;
  font-family:var(--font-display);font-weight:700;font-size:.95rem;letter-spacing:.04em;line-height:1.2;
  transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn-primary{background:var(--orange);color:var(--ink-950);box-shadow:4px 4px 0 rgba(45,226,230,.35)}
.btn-primary:hover{background:var(--orange-300);transform:translate(-1px,-1px);box-shadow:6px 6px 0 rgba(45,226,230,.42)}
.btn-ghost{border-color:var(--line-strong);color:var(--paper);background:rgba(13,41,64,.5)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-block{width:100%;justify-content:space-between}
.btn-arrow{font-family:var(--font-mono);font-size:13px;transition:transform .18s var(--ease)}
.btn:hover .btn-arrow{transform:translateX(3px)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  background:var(--ink-950);
  border-top:2px solid var(--orange);
  color:var(--paper);
}
.footer-inner{
  display:grid;gap:2rem;
  max-width:var(--maxw);margin-inline:auto;
  padding:clamp(2.2rem,5vw,3.6rem) var(--gutter) 1.4rem;
}
.footer-grid{display:grid;gap:2rem;grid-template-columns:1fr}
.footer-brand{display:grid;gap:.6rem;align-content:start}
.footer-mark{
  display:inline-grid;place-items:center;width:44px;height:44px;
  background:var(--orange);color:var(--ink-950);
  font-family:var(--font-display);font-weight:900;font-size:1.15rem;
  box-shadow:4px 4px 0 var(--cyan-700);
}
.footer-brandname{font-family:var(--font-display);font-weight:900;font-size:1.15rem;letter-spacing:.02em;line-height:1.2}
.footer-tagline{max-width:34ch;font-size:.9rem;line-height:1.7;color:var(--muted)}
.footer-mono{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--orange-300)}
.footer-col{display:grid;gap:.85rem;align-content:start}
.footer-col-title{
  font-family:var(--font-mono);font-weight:500;font-size:11px;letter-spacing:.2em;color:var(--cyan);
}
.footer-links{display:grid;gap:.55rem}
.footer-link{
  display:inline-flex;align-items:center;gap:.5rem;width:fit-content;
  padding-bottom:1px;border-bottom:1px solid transparent;
  font-size:.92rem;color:rgba(247,242,232,.75);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-link::before{
  content:"";flex:0 0 auto;width:10px;height:1px;background:var(--line-strong);
  transition:width .18s var(--ease),background-color .18s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--paper);border-bottom-color:var(--cyan)}
.footer-link:hover::before{width:18px;background:var(--orange)}
.footer-contact{display:grid;gap:.75rem;align-content:start}
.footer-contact-list{display:grid;gap:.6rem}
.footer-contact-row{display:grid;gap:.1rem;font-size:.9rem;color:rgba(247,242,232,.8)}
.footer-contact-label{font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;color:rgba(216,222,228,.5)}
.footer-contact-value{word-break:break-word}
.footer-note{font-size:.82rem;line-height:1.65;color:var(--muted);max-width:36ch}
.btn-copy{justify-self:start;padding:.5rem .85rem;font-size:.82rem}
.btn-copy[data-copied="true"]{border-color:var(--ok);color:var(--ok)}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:.75rem 1.5rem;
  justify-content:space-between;align-items:center;
  padding-top:1.25rem;border-top:1px solid var(--line);
}
.footer-legal{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:rgba(216,222,228,.55)}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:1rem}
.footer-legal-links a{
  font-size:.82rem;color:rgba(247,242,232,.7);border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-legal-links a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

/* ---------- shared components ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.2rem .55rem;border:1px solid var(--line-strong);border-radius:2px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--muted);
}
.tag--orange{border-color:var(--orange);color:var(--orange-300);background:rgba(255,106,26,.08)}
.tag--cyan{border-color:var(--cyan);color:var(--cyan);background:rgba(45,226,230,.08)}
.tag--ok{border-color:var(--ok);color:var(--ok);background:rgba(62,213,152,.08)}

.card{
  padding:clamp(1.1rem,2.4vw,1.6rem);
  background:var(--paper);color:var(--ink-950);
  border:1px solid rgba(4,17,31,.14);border-radius:2px;
  box-shadow:var(--shadow-hard);
}
.card h3,.card h4{color:var(--ink-950)}
.card p{color:rgba(4,17,31,.78)}
.card-dark{
  padding:clamp(1.1rem,2.4vw,1.6rem);
  background:var(--ink-800);color:var(--paper);
  border:1px solid var(--line-strong);border-radius:2px;
}

.checklist{display:grid;gap:.5rem}
.checklist-item{
  display:grid;grid-template-columns:auto 1fr;gap:.7rem;align-items:start;
  padding:.6rem .8rem;
  border-left:2px solid var(--line-strong);
  background:rgba(13,41,64,.5);
  font-size:.92rem;color:rgba(247,242,232,.82);
}
.checklist-item[data-state="done"]{border-left-color:var(--ok)}
.checklist-mark{
  display:grid;place-items:center;width:18px;height:18px;margin-top:.2rem;
  border:1px solid var(--line-strong);border-radius:2px;
  font-family:var(--font-mono);font-size:10px;color:var(--muted);
}
.checklist-item[data-state="done"] .checklist-mark{
  border-color:var(--ok);color:var(--ok);background:rgba(62,213,152,.12);
}

.breadcrumbs{padding-block:.85rem;border-bottom:1px solid var(--line)}
.breadcrumbs ol{
  display:flex;flex-wrap:wrap;gap:.5rem;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:rgba(216,222,228,.55);
}
.breadcrumbs a{color:rgba(247,242,232,.72);transition:color .18s var(--ease)}
.breadcrumbs a:hover{color:var(--cyan)}
.crumb-sep{color:rgba(216,222,228,.3)}
.breadcrumbs [aria-current="page"]{color:var(--orange-300)}

.media-frame{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--line-strong);border-radius:2px;
  background:
    radial-gradient(120% 90% at 82% 0%,rgba(45,226,230,.20),transparent 62%),
    radial-gradient(90% 80% at 8% 100%,rgba(255,106,26,.16),transparent 60%),
    linear-gradient(150deg,var(--ink-800),var(--ink-950));
  box-shadow:0 20px 44px -30px rgba(0,0,0,.95);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(to bottom,rgba(4,17,31,.20) 0 1px,transparent 1px 3px);
  opacity:.55;
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame figcaption{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:.45rem .7rem;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  background:rgba(4,17,31,.88);color:var(--orange-300);
  border-top:1px solid var(--orange);
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}

.toc{display:grid;gap:.15rem;border-left:1px solid var(--line-strong)}
.toc-title{
  padding:.3rem 0 .35rem .7rem;
  font-family:var(--font-mono);font-weight:500;font-size:11px;letter-spacing:.2em;color:var(--cyan);
}
.toc-link{
  display:flex;align-items:baseline;gap:.55rem;
  margin-left:-1px;padding:.4rem .7rem;
  border-left:2px solid transparent;
  font-size:.88rem;color:rgba(247,242,232,.64);
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.toc-link .mono{font-size:11px;color:rgba(216,222,228,.42)}
.toc-link:hover{color:var(--cyan);border-left-color:var(--orange-300)}
.toc-link[aria-current="true"]{
  color:var(--cyan);border-left-color:var(--orange);
  background:linear-gradient(90deg,rgba(45,226,230,.12),transparent 80%);
}
.toc-link[aria-current="true"] .mono{color:var(--orange)}

.scroll-progress{
  position:fixed;top:0;left:0;z-index:90;
  width:100%;height:3px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--orange),var(--cyan));
  pointer-events:none;
}
.to-top{
  position:fixed;right:clamp(.9rem,3vw,2rem);bottom:clamp(.9rem,3vw,2rem);z-index:70;
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.55rem .8rem;border:1px solid var(--orange);border-radius:2px;
  background:rgba(4,17,31,.92);color:var(--orange-300);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  box-shadow:0 16px 32px -20px rgba(0,0,0,.95);
  opacity:0;transform:translateY(10px);pointer-events:none;
  transition:opacity .25s var(--ease),transform .25s var(--ease),background-color .2s var(--ease),color .2s var(--ease);
}
.to-top::before{content:"↑";font-size:14px;line-height:1}
.to-top[data-visible="true"]{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{background:var(--orange);color:var(--ink-950)}

/* ---------- animation ---------- */
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 3px rgba(45,226,230,.18);opacity:1}
  50%{box-shadow:0 0 0 7px rgba(45,226,230,.05);opacity:.72}
}
@keyframes rail-in{
  from{opacity:0;transform:translateY(-6px)}
  to{opacity:1;transform:none}
}

/* ---------- responsive ---------- */
@media (max-width:399px){
  .brand-desc{display:none}
  .brand-mark{width:34px;height:34px;font-size:.95rem}
}

@media (min-width:640px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .rail-inner{padding:.8rem 1.5rem}
  .footer-inner{padding-bottom:1.6rem}
}

@media (min-width:720px){
  .grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (min-width:960px){
  .grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .skip-link{left:calc(var(--rail-w) + .6rem)}
  .scroll-progress{left:var(--rail-w);width:calc(100% - var(--rail-w))}

  .site-header{
    position:fixed;top:0;left:0;bottom:0;
    width:var(--rail-w);
    border-bottom:0;border-right:1px solid var(--line-strong);
    background:linear-gradient(180deg,var(--ink-900) 0%,var(--ink-950) 100%);
    box-shadow:none;
  }
  .site-header::after{
    content:"";position:absolute;top:0;right:-1px;bottom:0;width:3px;
    background:repeating-linear-gradient(to bottom,rgba(255,106,26,.85) 0 14px,transparent 14px 40px);
    opacity:.55;pointer-events:none;
  }
  .rail-inner{
    display:flex;flex-direction:column;
    gap:1.1rem;
    height:100%;max-width:none;
    padding:1.5rem 1.15rem 1.4rem;
    overflow-y:auto;overscroll-behavior:contain;
  }
  .rail-status{
    display:flex;align-items:center;gap:.5rem;
    font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;color:var(--muted);
  }
  .brand{gap:.7rem}
  .brand-mark{width:42px;height:42px;font-size:1.1rem}
  .brand-name{font-size:1.02rem;white-space:normal}
  .brand-desc{white-space:normal;font-size:9.5px}
  .nav-toggle{display:none}
  .site-nav{
    display:block;grid-column:auto;
    margin-top:.2rem;padding-top:.7rem;
    border-top:1px solid var(--line);
  }
  .site-header[data-open] .site-nav{max-height:none;overflow:visible}
  .nav-link{padding:.6rem .3rem .6rem .55rem;font-size:.88rem}
  .nav-label{font-size:.95rem}
  .rail-foot{display:grid;gap:.7rem;margin-top:auto;padding-top:1rem}
  .rail-note{font-size:10px}

  .footer-grid{grid-template-columns:1.35fr .8fr .8fr 1.15fr;gap:clamp(1.5rem,3vw,3rem)}
  .footer-inner{padding-top:clamp(2.6rem,4vw,3.6rem)}
}

@media (min-width:1280px){
  :root{--rail-w:296px}
  .rail-inner{padding:1.75rem 1.4rem 1.5rem}
  .nav-link{padding:.68rem .35rem .68rem .65rem}
}

/* ---------- 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;
  }
  .status-dot{animation:none}
  .to-top{transform:none}
}