/* ============================================================
   极速彩中心 · 共享样式 /assets/site.css
   坐标锚点 / 纸张叠层 / 目录条带
   ============================================================ */

:root{
  --ink:#05070D;
  --indigo:#0E1730;
  --violet:#2A1E63;
  --blue:#1E4BFF;
  --orange:#FF5A1F;
  --wine:#7C1230;
  --lime:#C6FF3D;
  --paper:#F2F6FF;
  --mist:#93A2C4;
  --rule:#D9DEE8;
  --rule-soft:rgba(217,222,232,.16);
  --rule-mid:rgba(217,222,232,.34);
  --shade:#0B1020;
  --wrap:1320px;
  --gutter:clamp(16px,4vw,44px);
  --ease:cubic-bezier(.2,.8,.2,1);
  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei","Heiti SC",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono","IBM Plex Mono",Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,svg,picture,video{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
h1,h2,h3,h4,h5,h6{font-weight:800;line-height:.95;letter-spacing:-.02em}
strong{font-weight:700}

/* ---------- 中文排版基线 ---------- */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--paper);
  background:var(--ink);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
#main-content{scroll-margin-top:118px}

/* ---------- 焦点 ---------- */
:where(a,button,[tabindex],summary,input,select,textarea):focus-visible{
  outline:2px solid var(--blue);
  outline-offset:2px;
  box-shadow:0 0 0 5px rgba(30,75,255,.25);
}
.site-nav :where(a):focus-visible,
.footer-links :where(a):focus-visible{
  outline:2px solid var(--blue);
  outline-offset:-2px;
  box-shadow:inset 0 0 0 1px rgba(242,246,255,.5);
}

/* ---------- 布局基元 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:24px;
}
.prose{max-width:38em}
.prose p + p{margin-top:1em}
.prose a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}
.prose h3{margin-top:1.6em;margin-bottom:.5em;font-size:24px}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:0;
  left:0;
  z-index:200;
  transform:translateY(-120%);
  padding:12px 20px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--ink);
  background:var(--lime);
  border:1px solid var(--ink);
  transition:transform .18s var(--ease);
}
.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px 8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--mist);
}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"／";color:var(--rule-mid)}
.crumbs a{color:var(--mist);transition:color .18s var(--ease)}
.crumbs a:hover{color:var(--paper)}
.crumbs [aria-current="page"]{color:var(--paper)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:11px 18px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.1em;
  line-height:1.2;
  border:1px solid transparent;
  border-radius:0;
  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{
  color:var(--ink);
  background:var(--orange);
  border-color:var(--orange);
  box-shadow:3px 3px 0 rgba(124,18,48,.55);
}
.btn--primary:hover{
  transform:translateY(-2px);
  box-shadow:6px 6px 0 rgba(124,18,48,.55);
}
.btn--ghost{
  color:var(--paper);
  background:transparent;
  border-color:var(--rule-mid);
}
.btn--ghost:hover{
  color:var(--paper);
  background:rgba(30,75,255,.18);
  border-color:var(--blue);
  transform:translateY(-2px);
}

/* ---------- 面板 / 条带 / 徽章 / 图片容器 ---------- */
.panel{
  position:relative;
  padding:clamp(18px,3vw,32px);
  background:var(--indigo);
  border:1px solid var(--rule-soft);
  box-shadow:6px 6px 0 var(--shade);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease);
}
.panel:hover{
  transform:translateY(-3px);
  box-shadow:10px 10px 0 var(--shade);
  border-color:var(--blue);
}
.panel--paper{background:var(--paper);color:var(--ink);border-color:var(--rule)}

.band{
  display:flex;
  align-items:center;
  gap:12px;
  padding:10px 14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--paper);
  background:rgba(30,75,255,.14);
  border-left:3px solid var(--blue);
}
.band--wine{background:rgba(124,18,48,.26);border-left-color:var(--wine)}
.band--orange{background:rgba(255,90,31,.16);border-left-color:var(--orange)}

.badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:5px 14px 5px 12px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.14em;
  line-height:1.4;
  white-space:nowrap;
  clip-path:polygon(0 0,calc(100% - 9px) 0,100% 100%,0 100%);
}
.badge--stable{background:var(--blue);color:#FFFFFF}
.badge--preview{background:var(--orange);color:var(--ink)}
.badge--archive{background:var(--wine);color:var(--paper)}

.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:5 / 3;
  border:1px solid var(--rule-soft);
  box-shadow:6px 6px 0 var(--shade);
  background-color:var(--indigo);
  background-image:
    repeating-linear-gradient(0deg,rgba(217,222,232,.09) 0 1px,transparent 1px 28px),
    repeating-linear-gradient(90deg,rgba(217,222,232,.09) 0 1px,transparent 1px 28px);
}
.media-frame > img,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--tilt{clip-path:polygon(0 0,100% 0,100% 90%,0 100%)}

/* ============================================================
   头部
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink);
  border-bottom:1px solid var(--rule-soft);
}
.header-upper{
  position:relative;
  background:var(--indigo);
  border-bottom:1px solid var(--rule-soft);
}
.header-upper::before{
  content:"";
  position:absolute;
  left:0;
  bottom:-1px;
  width:clamp(64px,12vw,180px);
  height:2px;
  background:var(--blue);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,32px);
  padding-block:14px;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}
.brand-cross{
  position:relative;
  width:26px;
  height:26px;
  flex:0 0 auto;
  border:1px solid var(--blue);
  border-radius:50%;
}
.brand-cross::before,
.brand-cross::after{
  content:"";
  position:absolute;
  background:var(--orange);
}
.brand-cross::before{left:50%;top:-6px;bottom:-6px;width:1px;transform:translateX(-50%)}
.brand-cross::after{top:50%;left:-6px;right:-6px;height:1px;transform:translateY(-50%)}
.brand-text{display:flex;flex-direction:column;gap:2px}
.brand-name{
  font-size:20px;
  font-weight:800;
  letter-spacing:-.01em;
  line-height:1.1;
  color:var(--paper);
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  line-height:1.4;
  color:var(--mist);
}

.header-note{
  flex:1 1 auto;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--mist);
  text-align:right;
  border-right:1px solid var(--rule-soft);
  padding-right:clamp(12px,2vw,28px);
  margin-right:2px;
}
.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}

/* 移动开关 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:11px 14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--paper);
  background:transparent;
  border:1px solid var(--rule-mid);
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--blue);background:rgba(30,75,255,.18)}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:18px;
  height:12px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:2px;
  background:currentColor;
  transition:transform .18s var(--ease),top .18s var(--ease),bottom .18s var(--ease);
}
.nav-toggle-bars::before{top:1px}
.nav-toggle-bars::after{bottom:1px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{bottom:5px;transform:rotate(-45deg)}

/* 目录条带导航 */
.header-lower{background:var(--ink)}
.site-nav{width:100%}
.nav-band{
  display:flex;
  align-items:stretch;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.nav-item{flex:1 1 0;display:flex;min-width:0}
.nav-link{
  display:flex;
  align-items:center;
  gap:10px;
  width:100%;
  min-height:54px;
  padding:13px clamp(10px,1.6vw,20px);
  color:var(--paper);
  border-left:1px solid var(--rule-soft);
  transition:background-color .18s var(--ease),box-shadow .18s var(--ease),color .18s var(--ease);
}
.nav-item:last-child .nav-link{border-right:1px solid var(--rule-soft)}
.nav-num{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--mist);
  transition:color .18s var(--ease);
}
.nav-label{
  flex:1 1 auto;
  min-width:0;
  font-size:15px;
  font-weight:600;
  letter-spacing:.01em;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.nav-dot{
  width:5px;
  height:5px;
  flex:0 0 auto;
  border-radius:50%;
  background:var(--rule-mid);
  transition:background-color .18s var(--ease);
}
.nav-link:hover{
  background:var(--indigo);
  box-shadow:inset 0 2px 0 var(--blue);
}
.nav-link:hover .nav-dot{background:var(--lime)}
.nav-link[aria-current="page"]{
  background:var(--blue);
  color:#FFFFFF;
  box-shadow:inset 0 -3px 0 var(--orange);
}
.nav-link[aria-current="page"] .nav-num{color:rgba(242,246,255,.78)}
.nav-link[aria-current="page"] .nav-dot{background:var(--lime)}

/* 滚动进度 */
.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  overflow:hidden;
  background:var(--rule-soft);
  pointer-events:none;
}
.scroll-meter-fill{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--blue) 0%,var(--blue) 62%,var(--orange) 100%);
  transition:transform .1s linear;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  overflow:hidden;
  background:var(--ink);
  color:var(--paper);
  border-top:1px solid var(--rule-soft);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:clamp(80px,16vw,240px);
  height:2px;
  background:var(--orange);
}
.footer-cross{
  position:absolute;
  top:clamp(20px,3vw,40px);
  right:clamp(20px,4vw,56px);
  width:56px;
  height:56px;
  border:1px solid var(--rule-soft);
  border-radius:50%;
  opacity:.55;
  pointer-events:none;
}
.footer-cross::before,
.footer-cross::after{
  content:"";
  position:absolute;
  background:var(--rule-mid);
}
.footer-cross::before{left:50%;top:-10px;bottom:-10px;width:1px;transform:translateX(-50%)}
.footer-cross::after{top:50%;left:-10px;right:-10px;height:1px;transform:translateY(-50%)}

.footer-inner{
  display:grid;
  grid-template-columns:minmax(220px,4fr) 8fr;
  gap:clamp(24px,4vw,64px);
  padding-block:clamp(36px,6vw,76px);
}
.footer-brand{max-width:34em}
.footer-mark{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-bottom:16px;
}
.footer-mark-dot{
  width:10px;
  height:10px;
  flex:0 0 auto;
  background:var(--orange);
  box-shadow:0 0 0 1px var(--orange);
}
.footer-mark-text{
  font-size:18px;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--paper);
}
.footer-note{
  font-size:14px;
  line-height:1.7;
  color:var(--mist);
}
.footer-note + .footer-note{margin-top:14px}
.footer-note--mono{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--rule-mid);
}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.footer-col-title{
  display:flex;
  align-items:baseline;
  gap:10px;
  margin-bottom:16px;
  padding-bottom:10px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--paper);
  border-bottom:1px solid var(--rule-soft);
}
.footer-col-num{color:var(--blue)}
.footer-links li + li{margin-top:10px}
.footer-links a{
  display:inline-block;
  padding-bottom:2px;
  font-size:15px;
  color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-links a:hover{
  color:var(--paper);
  border-bottom-color:var(--orange);
}

.footer-base{border-top:1px solid var(--rule-soft)}
.footer-base-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 28px;
  padding-block:20px;
  font-size:13px;
  color:var(--mist);
}
.footer-legal{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
}
.footer-sep{color:var(--rule-mid);margin:0 6px}
.footer-contact{
  display:flex;
  flex-wrap:wrap;
  gap:6px 22px;
}
.footer-kv{display:inline-flex;align-items:baseline;gap:8px}
.footer-kv-key{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--mist);
  opacity:.8;
}

/* ---------- 显现协议 ---------- */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
html.js [data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1280px){
  .header-note{font-size:10px;letter-spacing:.1em}
}

@media (max-width:1100px){
  .header-note{display:none}
  .nav-label{font-size:14px}
}

@media (max-width:960px){
  #main-content{scroll-margin-top:24px}
  .site-header{position:static}
  .header-inner{flex-wrap:wrap;row-gap:12px}
  .header-actions{margin-left:auto}
  .nav-toggle{display:inline-flex}

  .site-nav{display:none}
  .site-nav[data-open="true"]{display:block}
  .nav-band{
    flex-direction:column;
    padding-inline:0;
    background:var(--indigo);
    border-top:1px solid var(--rule-soft);
  }
  .nav-item{flex:1 1 auto}
  .nav-link{
    min-height:0;
    padding:15px var(--gutter);
    border-left:0;
    border-bottom:1px solid var(--rule-soft);
  }
  .nav-item:last-child .nav-link{border-right:0}
  .nav-link[aria-current="page"]{box-shadow:inset 3px 0 0 var(--orange)}
  .nav-label{font-size:15px}

  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));gap:18px}

  .footer-inner{grid-template-columns:1fr;gap:32px}
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-cross{display:none}
}

@media (max-width:640px){
  .header-actions .btn--ghost{display:none}
  .brand-name{font-size:17px}
  .brand-sub{font-size:9px;letter-spacing:.12em}
  .brand-cross{width:22px;height:22px}
  .btn{padding:10px 14px;font-size:11px;letter-spacing:.08em}

  .grid-12{grid-template-columns:1fr;gap:16px}

  .footer-cols{grid-template-columns:1fr;gap:24px}
  .footer-base-inner{flex-direction:column;align-items:flex-start}
  .footer-contact{flex-direction:column;gap:6px}
  .footer-note{font-size:13px}
  .media-frame{box-shadow:4px 4px 0 var(--shade)}
}

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