/* =========================================================
   百灵牛牛 · 共享样式 /assets/site.css
   设计逻辑：夜羽蓝深底 + 斜切羽纹 + 命令栏索引感 + 粗野主义边框
   ========================================================= */

:root{
  --ink:#071C2C;
  --ink-deep:#03121C;
  --blue:#0E6BA8;
  --cyan:#19C3D8;
  --green:#1FBF8F;
  --gold:#F4B942;
  --coral:#FF6B4A;
  --paper:#F3F7F4;
  --mist:#9CC7D9;
  --violet:#5B6CFF;

  --panel:#0A2436;
  --line:rgba(156,199,217,.24);
  --line-strong:rgba(156,199,217,.42);
  --shadow:6px 6px 0 rgba(3,18,28,.72);

  --font-display:'BailingDisplay','HarmonyOS Sans SC','Source Han Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-body:'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace;

  --shell:1200px;
  --radius:2px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 80% at 86% -12%,rgba(14,107,168,.38),transparent 62%),
    radial-gradient(90% 70% at -8% 4%,rgba(25,195,216,.14),transparent 58%);
  background-repeat:no-repeat;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;max-width:100%;}
h1,h2,h3,h4{
  margin:0 0 .6em;
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.15;
  letter-spacing:-.02em;
  color:var(--paper);
}
h1{font-size:clamp(2.1rem,5vw,3.4rem);}
h2{font-size:clamp(1.55rem,3.4vw,2.2rem);}
h3{font-size:clamp(1.12rem,2.2vw,1.4rem);}
p{margin:0 0 1em;}
ul,ol{margin:0;}
a{color:var(--cyan);text-decoration:none;text-underline-offset:3px;}
a:hover{color:var(--paper);}
button{font:inherit;}
:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;}
::selection{background:var(--gold);color:var(--ink-deep);}

/* ---------- 工具 ---------- */
.shell{width:min(var(--shell),calc(100% - 2.5rem));margin-inline:auto;}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em;}
.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  margin:0 0 .9rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--gold);}
.lead{font-size:1.12rem;line-height:1.72;color:rgba(243,247,244,.9);}
.prose{max-width:72ch;}
.prose h2,.prose h3{margin-top:1.8em;}
.prose p,.prose li{color:rgba(243,247,244,.92);}
.prose ul,.prose ol{padding-left:1.15rem;}
.prose li{margin-block:.35em;}
.prose blockquote{
  margin:1.6rem 0;padding:.9rem 1.2rem;
  border-left:3px solid var(--cyan);
  background:rgba(14,107,168,.16);
  color:var(--paper);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.45rem;
  padding:.62rem 1.05rem;
  border:2px solid var(--blue);border-radius:var(--radius);
  background:transparent;color:var(--paper);
  font-family:var(--font-display);font-weight:800;font-size:.92rem;line-height:1.2;
  letter-spacing:.01em;text-decoration:none;cursor:pointer;
  box-shadow:4px 4px 0 rgba(3,18,28,.6);
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),
             background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.btn:hover{transform:translate(-1px,-1px);box-shadow:6px 6px 0 rgba(3,18,28,.78);color:var(--paper);}
.btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 rgba(3,18,28,.78);}
.btn-solid{background:var(--cyan);border-color:var(--cyan);color:var(--ink-deep);}
.btn-solid:hover{background:var(--gold);border-color:var(--gold);color:var(--ink-deep);}
.btn-ghost{background:rgba(14,107,168,.18);border-color:var(--blue);color:var(--paper);}
.btn-ghost:hover{background:rgba(25,195,216,.22);border-color:var(--cyan);}
.btn-outline{background:transparent;border-color:var(--gold);color:var(--gold);}
.btn-outline:hover{background:var(--gold);border-color:var(--gold);color:var(--ink-deep);}
.btn-sm{padding:.4rem .72rem;font-size:.82rem;box-shadow:3px 3px 0 rgba(3,18,28,.6);}
.btn[aria-disabled="true"]{opacity:.45;cursor:not-allowed;transform:none;}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;left:1rem;top:-6rem;z-index:200;
  padding:.7rem 1.1rem;
  background:var(--gold);color:var(--ink-deep);
  font-family:var(--font-display);font-weight:800;
  border-radius:var(--radius);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:.8rem;color:var(--ink-deep);}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--ink-deep);
  border-bottom:1px solid var(--line);
  isolation:isolate;
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:3px;z-index:1;
  background:linear-gradient(90deg,var(--cyan),var(--green) 42%,var(--gold) 76%,var(--coral));
}
.site-header.is-scrolled{box-shadow:0 14px 34px -20px #000;}
.scroll-meter{
  position:absolute;left:0;right:0;bottom:0;height:3px;z-index:2;
  background:rgba(3,18,28,.55);
}
.scroll-meter > i{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:var(--gold);
}
.header-rail{background:linear-gradient(180deg,#04151F,var(--ink-deep));}
.rail-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:1rem;padding-block:.68rem;
}

.brand{display:flex;align-items:center;gap:.7rem;min-width:0;color:var(--paper);text-decoration:none;}
.brand:hover{color:var(--paper);}
.brand-mark{
  flex:none;display:grid;grid-template-columns:repeat(3,6px);gap:3px;
  align-items:end;height:30px;transform:skewX(-14deg);
}
.brand-mark i{display:block;border-radius:1px;}
.brand-mark i:nth-child(1){height:14px;background:var(--cyan);}
.brand-mark i:nth-child(2){height:22px;background:var(--green);}
.brand-mark i:nth-child(3){height:30px;background:var(--gold);}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0;}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:1.08rem;letter-spacing:-.01em;}
.brand-line{
  font-family:var(--font-mono);font-size:.7rem;color:var(--mist);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}

.rail-meta{
  display:flex;align-items:center;gap:.6rem;margin:0;
  font-family:var(--font-mono);font-size:.72rem;color:var(--mist);letter-spacing:.02em;
}
.rail-chip,.rail-device{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.22rem .55rem;border:1px solid var(--line);border-radius:var(--radius);
  white-space:nowrap;
}
.rail-chip b{color:var(--gold);font-weight:700;}
.rail-device b{color:var(--paper);font-weight:700;}

.rail-actions{display:flex;align-items:center;gap:.55rem;margin:0;}

.nav-toggle{
  display:none;align-items:center;gap:.5rem;
  padding:.4rem .62rem;
  background:transparent;color:var(--paper);
  border:2px solid var(--line-strong);border-radius:var(--radius);
  font-family:var(--font-display);font-weight:800;font-size:.85rem;
  cursor:pointer;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle-lines{display:grid;gap:3px;width:18px;}
.nav-toggle-lines span{display:block;height:2px;background:currentColor;transition:transform .18s var(--ease),opacity .18s var(--ease);}
.nav-toggle-label{white-space:nowrap;}
.site-header[data-open] .nav-toggle{border-color:var(--gold);color:var(--gold);}
.site-header[data-open] .nav-toggle-lines span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.site-header[data-open] .nav-toggle-lines span:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle-lines span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* ---------- 主导航 ---------- */
.header-nav{border-top:1px solid var(--line);background:rgba(7,28,44,.88);}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:1.25rem;}
.nav-list{
  display:flex;align-items:center;gap:.15rem;
  list-style:none;margin:0;padding:0;
  counter-reset:nav;
  overflow-x:auto;scrollbar-width:none;overscroll-behavior-x:contain;
}
.nav-list::-webkit-scrollbar{display:none;}
.nav-list li{flex:none;counter-increment:nav;}
.nav-list a{
  position:relative;
  display:inline-flex;align-items:baseline;gap:.4rem;
  padding:.8rem .8rem .72rem;
  color:var(--mist);font-weight:700;font-size:.92rem;letter-spacing:.01em;
  border-bottom:3px solid transparent;white-space:nowrap;text-decoration:none;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-list a::before{
  content:counter(nav,decimal-leading-zero);
  font-family:var(--font-mono);font-size:.66rem;color:rgba(156,199,217,.55);
}
.nav-list a:hover{color:var(--paper);border-bottom-color:var(--blue);background:rgba(14,107,168,.2);}
.nav-list a[aria-current="page"]{color:var(--gold);border-bottom-color:var(--gold);}
.nav-list a[aria-current="page"]::before{color:var(--gold);}
.nav-note{
  margin:0;font-family:var(--font-mono);font-size:.68rem;
  color:rgba(156,199,217,.72);white-space:nowrap;
}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  margin:0 0 1.5rem;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.05em;color:var(--mist);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:.5rem;list-style:none;margin:0;padding:0;}
.breadcrumbs li::after{content:"/";margin-left:.5rem;color:rgba(156,199,217,.42);}
.breadcrumbs li:last-child::after{content:"";}
.breadcrumbs a{color:var(--mist);}
.breadcrumbs a:hover{color:var(--cyan);}
.breadcrumbs [aria-current="page"]{color:var(--gold);}

/* ---------- 网格 / 信息板 / 卡片 ---------- */
.grid{display:grid;gap:1.25rem;}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(215px,1fr));}
.grid-asym{display:grid;gap:1.5rem;grid-template-columns:minmax(0,1fr);}

.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:1rem;margin-bottom:1.6rem;
}
.section-head p{margin:0;max-width:52ch;color:var(--mist);}

.panel{
  position:relative;
  background:linear-gradient(180deg,rgba(14,107,168,.22),rgba(3,18,28,.94));
  border:2px solid var(--line);border-radius:var(--radius);
  padding:1.4rem;box-shadow:var(--shadow);
}
.panel--flush{padding:0;overflow:hidden;}
.panel--gold{border-color:rgba(244,185,66,.62);}

.card{
  position:relative;display:flex;flex-direction:column;gap:.6rem;
  padding:1.25rem;background:var(--panel);
  border:2px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);
  transition:transform .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.card:hover{transform:translate(-2px,-2px);border-color:var(--cyan);box-shadow:8px 8px 0 rgba(3,18,28,.82);}
.card h3{margin:0;}
.card p{margin:0;font-size:.96rem;color:rgba(243,247,244,.84);}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.2rem .5rem;border:1px solid var(--line-strong);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.06em;
  text-transform:uppercase;color:var(--mist);
}
.tag--cyan{color:var(--cyan);border-color:rgba(25,195,216,.55);background:rgba(25,195,216,.12);}
.tag--green{color:var(--green);border-color:rgba(31,191,143,.55);background:rgba(31,191,143,.12);}
.tag--gold{color:var(--gold);border-color:rgba(244,185,66,.55);background:rgba(244,185,66,.12);}
.tag--coral{color:var(--coral);border-color:rgba(255,107,74,.55);background:rgba(255,107,74,.13);}
.tag--violet{color:var(--violet);border-color:rgba(91,108,255,.6);background:rgba(91,108,255,.15);}

/* ---------- 图片容器基础规则 ---------- */
.media{
  position:relative;display:block;width:100%;aspect-ratio:16/10;
  overflow:hidden;border:2px solid var(--line);border-radius:var(--radius);
  background:
    radial-gradient(115% 85% at 12% 10%,rgba(25,195,216,.42),transparent 62%),
    radial-gradient(110% 90% at 88% 92%,rgba(31,191,143,.34),transparent 62%),
    repeating-linear-gradient(112deg,rgba(243,247,244,.07) 0 2px,transparent 2px 15px),
    var(--ink-deep);
}
.media--wide{aspect-ratio:21/9;}
.media--square{aspect-ratio:1/1;}
.media--tall{aspect-ratio:4/5;}
.media img{width:100%;height:100%;object-fit:cover;}
.media__tag{
  position:absolute;left:.7rem;bottom:.7rem;
  padding:.22rem .5rem;
  background:rgba(3,18,28,.84);border:1px solid var(--line-strong);
  font-family:var(--font-mono);font-size:.68rem;color:var(--paper);
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;margin-top:4rem;
  background:var(--ink-deep);color:var(--paper);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:4px;z-index:1;
  background:linear-gradient(90deg,var(--cyan),var(--green) 40%,var(--gold) 74%,var(--coral));
}
.footer-plume{
  position:absolute;right:-10%;top:-30%;width:54%;height:136%;
  background:repeating-linear-gradient(118deg,rgba(25,195,216,.2) 0 3px,transparent 3px 26px);
  transform:skewX(-16deg);opacity:.5;pointer-events:none;
}
.footer-grid{
  position:relative;display:grid;gap:2rem;
  grid-template-columns:1.5fr 1fr 1fr 1.25fr;
  padding-block:3.25rem 2.25rem;align-items:start;
}
.footer-brand{min-width:0;}
.footer-name{margin:0 0 .35rem;font-family:var(--font-display);font-weight:900;font-size:1.6rem;letter-spacing:-.02em;}
.footer-brand-line{
  margin:0 0 .9rem;font-family:var(--font-mono);font-size:.74rem;
  letter-spacing:.05em;color:var(--cyan);
}
.footer-meta{margin:0 0 1.1rem;max-width:34ch;font-size:.86rem;line-height:1.7;color:var(--mist);}
.footer-col{min-width:0;}
.footer-heading{
  margin:0 0 .9rem;font-family:var(--font-mono);
  font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);
}
.footer-list{display:grid;gap:.55rem;list-style:none;margin:0;padding:0;font-size:.92rem;}
.footer-list a{
  color:var(--mist);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-list a:hover,.footer-list a:focus-visible{color:var(--paper);border-bottom-color:var(--cyan);}
.footer-contact-list li{display:grid;gap:.1rem;}
.footer-key{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;
  text-transform:uppercase;color:rgba(156,199,217,.76);
}
.footer-val{color:var(--paper);font-size:.9rem;overflow-wrap:anywhere;}

.index-strip{
  position:relative;
  display:flex;align-items:center;gap:1.1rem;
  margin-bottom:1.6rem;padding:1rem 1.15rem;
  background:linear-gradient(90deg,rgba(244,185,66,.16),rgba(14,107,168,.2) 58%,rgba(3,18,28,0));
  border:2px solid rgba(244,185,66,.5);border-left-width:6px;border-radius:var(--radius);
  box-shadow:6px 6px 0 rgba(3,18,28,.7);
}
.index-strip-no{
  flex:none;font-family:var(--font-mono);font-weight:700;
  font-size:1.7rem;line-height:1;color:var(--gold);
}
.index-strip-body{flex:1 1 auto;min-width:0;}
.index-strip-title{margin:0;font-family:var(--font-display);font-weight:800;font-size:.98rem;color:var(--paper);}
.index-strip-note{margin:.15rem 0 0;font-size:.8rem;color:var(--mist);}

.footer-base{border-top:1px solid rgba(156,199,217,.18);background:rgba(3,18,28,.72);}
.footer-base-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.6rem;padding-block:1rem;
}
.footer-copy,.footer-icp{margin:0;font-size:.78rem;color:rgba(156,199,217,.82);}
.footer-icp{letter-spacing:.05em;}

/* ---------- 动效协议 ---------- */
.js-ready [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.js-ready [data-reveal].is-in{opacity:1;transform:none;}

@keyframes navDrop{
  from{opacity:0;transform:translateY(-6px);}
  to{opacity:1;transform:none;}
}

/* ---------- 响应式 ---------- */
@media (min-width:900px){
  .grid-asym{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);}
}
@media (max-width:1080px){
  .nav-note{display:none;}
}
@media (max-width:1000px){
  .rail-meta{display:none;}
}
@media (max-width:980px){
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:899px){
  .nav-toggle{display:inline-flex;}
  .header-nav{display:none;}
  .site-header[data-open] .header-nav{display:block;animation:navDrop .2s var(--ease) both;}
  .nav-wrap{flex-direction:column;align-items:stretch;padding-block:.5rem;}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;overflow:visible;}
  .nav-list li{flex:1 1 auto;}
  .nav-list a{
    display:flex;padding:.75rem .25rem;font-size:1rem;
    border-bottom:1px solid var(--line);border-left:3px solid transparent;
  }
  .nav-list a:hover{background:rgba(14,107,168,.22);}
  .nav-list a[aria-current="page"]{
    border-bottom-color:var(--line);border-left-color:var(--gold);padding-left:.6rem;
  }
  .nav-note{
    display:block;padding:.65rem .25rem .2rem;
    white-space:normal;line-height:1.5;
  }
  .rail-actions .btn-ghost{display:none;}
}
@media (max-width:640px){
  .index-strip{flex-wrap:wrap;gap:.8rem;}
  .index-strip .btn{width:100%;}
}
@media (max-width:560px){
  .shell{width:calc(100% - 1.5rem);}
  .brand-line{display:none;}
  .rail-actions{gap:.35rem;}
  .btn-sm{padding:.38rem .62rem;font-size:.8rem;}
  .footer-grid{grid-template-columns:1fr;gap:1.6rem;padding-block:2.4rem 1.8rem;}
  .footer-plume{opacity:.28;}
}

/* ---------- 减少动态 ---------- */
@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-ready [data-reveal]{opacity:1;transform:none;}
}