/* ===================================================================
   狗万安卓CN · 共享样式 /assets/site.css
   坐标网格 · 轨道导航 · 切角面板 · 夜航控制台
   =================================================================== */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video,canvas{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;width:100%}
[hidden]{display:none !important}

/* ---------- 2. 变量 ---------- */
:root{
  --ink:#070C11;
  --night:#0F1A22;
  --paper:#F2E9DA;
  --cyan:#38E0CE;
  --teal:#0E5F5A;
  --ember:#FF7A3D;
  --clay:#C2542B;
  --graphite:#C6D2D9;
  --soot:#221B16;
  --silent:#7C8C96;

  --line:rgba(56,224,206,.16);
  --line-soft:rgba(124,140,150,.24);
  --line-strong:rgba(56,224,206,.45);
  --line-paper:rgba(34,27,22,.18);

  --rail-w:88px;
  --topbar-h:68px;
  --unit:40px;
  --cut:18px;
  --maxw:1280px;

  --font-display:"Saira Condensed","Oswald","HarmonyOS Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"HarmonyOS Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-serif:"Noto Serif SC","Songti SC","SimSun",Georgia,"Times New Roman",serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Consolas,"Courier New",monospace;

  --ease:cubic-bezier(.2,.7,.2,1);
  --dur:480ms;
}
html[data-compact="true"]{--topbar-h:56px}
@media (max-width:899px){
  html,html[data-compact="true"]{--rail-w:0px;--topbar-h:58px}
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  padding-top:var(--topbar-h);
  padding-left:var(--rail-w);
  background-color:var(--ink);
  background-image:
    radial-gradient(1200px 620px at 78% -12%,rgba(56,224,206,.10),transparent 62%),
    radial-gradient(900px 520px at 6% 104%,rgba(255,122,61,.07),transparent 66%),
    linear-gradient(rgba(56,224,206,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(56,224,206,.055) 1px,transparent 1px);
  background-size:auto,auto,var(--unit) var(--unit),var(--unit) var(--unit);
  color:var(--graphite);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  transition:padding-left 220ms var(--ease),padding-top 220ms var(--ease);
}
main{display:block}
#main-content{scroll-margin-top:calc(var(--topbar-h) + 24px)}

h1,h2,h3{font-family:var(--font-display);font-weight:700;line-height:1.1;letter-spacing:-.01em;color:#fff}
h1{font-size:clamp(2.6rem,7vw,5.6rem)}
h2{font-size:clamp(1.7rem,3.4vw,2.7rem)}
h3{font-size:clamp(1.2rem,2vw,1.6rem)}
h4,h5,h6{font-family:var(--font-body);font-weight:600;color:#fff;line-height:1.4}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
strong{color:#fff;font-weight:600}
code,kbd,samp{font-family:var(--font-mono);font-size:.92em}

:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}

/* ---------- 4. 布局与文本工具 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:clamp(20px,4vw,56px);
}
.section{
  position:relative;
  padding-block:clamp(52px,8vw,112px);
  border-top:1px solid var(--line);
}
.section:first-of-type{border-top:0}
.section-head{display:grid;gap:14px;margin-bottom:clamp(24px,3.5vw,48px)}
.grid{display:grid;gap:clamp(20px,3vw,32px)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.2vw,28px)}

.page-head{display:grid;gap:16px;padding-block:clamp(40px,7vw,88px) clamp(24px,4vw,48px)}
.page-title{font-family:var(--font-display);font-weight:800;font-size:clamp(2.4rem,6.4vw,4.8rem);line-height:1;letter-spacing:-.01em;color:#fff}
.page-lede{max-width:62ch;font-size:clamp(1rem,1.5vw,1.12rem);color:#DCE6EC}

.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.24em;text-transform:uppercase;color:var(--cyan)}
.editorial-title{font-family:var(--font-serif);font-weight:700;font-size:clamp(1.25rem,2.2vw,1.8rem);line-height:1.4;color:#fff;letter-spacing:0}
.lede{font-size:clamp(1.02rem,1.8vw,1.2rem);line-height:1.7;color:#E1EAEF}
.muted{color:var(--silent)}
.mono{font-family:var(--font-mono);letter-spacing:.08em}
.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border:1px solid var(--line-strong);background:rgba(56,224,206,.05);color:var(--cyan);font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase}

.coord-line{position:relative;height:1px;background:var(--line);margin-block:clamp(28px,4vw,48px)}
.coord-line::before,.coord-line::after{content:"";position:absolute;top:-4px;width:1px;height:9px;background:var(--line-strong)}
.coord-line::before{left:0}
.coord-line::after{right:0}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;border:1px solid var(--line-strong);
  background:transparent;color:var(--cyan);
  font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.1em;
  transition:background-color 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease);
}
.btn:hover{background:rgba(56,224,206,.12);color:#fff}
.btn-primary{background:var(--ember);border-color:var(--ember);color:#1A0C04}
.btn-primary:hover{background:var(--clay);border-color:var(--clay);color:#fff}
.btn-ghost{border-color:var(--line-soft);color:var(--graphite)}
.btn-ghost:hover{border-color:var(--cyan);background:rgba(56,224,206,.08);color:var(--cyan)}

/* ---------- 6. 切角面板 ---------- */
.panel{
  position:relative;
  padding:clamp(20px,3vw,32px);
  background:linear-gradient(180deg,rgba(15,26,34,.94),rgba(7,12,17,.94));
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
}
.panel::after{
  content:"";position:absolute;top:0;right:0;
  width:calc(var(--cut) * 1.414);height:1px;
  background:var(--line-strong);
  transform:rotate(-45deg);transform-origin:top right;
}
.panel-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:18px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.panel--paper{
  background:var(--paper);
  border-color:var(--line-paper);
  color:var(--soot);
}
.panel--paper::after{background:rgba(14,95,90,.5)}
.panel--paper h2,.panel--paper h3,.panel--paper h4{color:var(--soot)}
.panel--paper .panel-head{border-bottom-color:var(--line-paper)}
.panel--paper a{color:var(--teal);text-decoration:underline;text-underline-offset:3px}
.panel--paper .eyebrow{color:var(--teal)}
.panel--paper .muted{color:#6B5F55}

/* ---------- 7. 图片位（页面阶段放占位图） ---------- */
.media{
  position:relative;
  display:block;
  margin:0;
  aspect-ratio:16/9;
  overflow:hidden;
  border:1px solid var(--line);
  background-color:var(--night);
  background-image:linear-gradient(135deg,rgba(56,224,206,.16),rgba(7,12,17,.9) 55%,rgba(255,122,61,.14));
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
}
.media img{width:100%;height:100%;object-fit:cover}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(56,224,206,.09) 1px,transparent 1px),
    linear-gradient(90deg,rgba(56,224,206,.09) 1px,transparent 1px);
  background-size:32px 32px;
}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--portrait{aspect-ratio:3/4}
.media-caption{display:block;margin-top:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--silent);text-transform:uppercase}

/* ---------- 8. 面包屑 ---------- */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--silent)}
.crumbs li{display:flex;align-items:center;gap:10px}
.crumbs li + li::before{content:"/";color:var(--line-strong)}
.crumbs a:hover{color:var(--cyan)}
.crumbs [aria-current="page"]{color:var(--cyan)}

/* ---------- 9. 显现动效 ---------- */
.js-ready [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease)}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 10. Header：轨道 + 控制台 ---------- */
.skip-link{
  position:fixed;top:10px;left:50%;z-index:200;
  transform:translate(-50%,-180%);
  padding:10px 18px;background:var(--cyan);color:#04100E;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  transition:transform 180ms var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

.site-header{position:fixed;inset:0;z-index:70;pointer-events:none}
.site-header > *{pointer-events:auto}

.rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:72;
  display:flex;flex-direction:column;align-items:center;gap:16px;
  padding:16px 0 20px;
  background:linear-gradient(180deg,rgba(15,26,34,.97),rgba(7,12,17,.99));
  border-right:1px solid var(--line);
  transition:width 220ms var(--ease);
}
.rail-brand{
  display:flex;flex-direction:column;align-items:center;gap:10px;
  width:100%;padding:4px 0 16px;
  border-bottom:1px solid var(--line);
}
.rail-brand-cn{
  writing-mode:vertical-rl;
  font-family:var(--font-display);font-weight:800;font-size:17px;
  letter-spacing:.14em;color:#fff;
}
.rail-brand-en{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.3em;color:var(--cyan);
}
.rail-list{display:flex;flex-direction:column;align-items:center;gap:4px;width:100%}
.rail-item{width:100%}
.rail-link{
  position:relative;
  display:flex;flex-direction:column;align-items:center;gap:6px;
  width:100%;padding:11px 6px;
  border-left:2px solid transparent;
  color:var(--silent);
  transition:color 200ms var(--ease),background-color 200ms var(--ease),border-color 220ms var(--ease);
}
.rail-num{font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;color:var(--silent);transition:color 200ms var(--ease)}
.rail-name{font-size:13px;font-weight:500;letter-spacing:.06em;white-space:nowrap;line-height:1.2}
.rail-link:hover{color:#E7F1F5;background:rgba(56,224,206,.07)}
.rail-link:hover .rail-num{color:var(--cyan)}
.rail-link[aria-current="page"]{
  color:#fff;
  background:linear-gradient(90deg,rgba(56,224,206,.16),rgba(56,224,206,0));
  border-left-color:var(--cyan);
}
.rail-link[aria-current="page"] .rail-num{color:var(--cyan)}
.rail-link:focus-visible{outline:2px solid var(--cyan);outline-offset:-2px}

.rail-foot{margin-top:auto;display:flex;flex-direction:column;align-items:center;gap:10px;width:100%;padding-top:14px;border-top:1px solid var(--line)}
.rail-status{display:flex;align-items:center;gap:6px;margin:0;font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--silent)}
.rail-status-text{white-space:nowrap}
.rail-dot{width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 3px rgba(56,224,206,.16)}
.rail-cta{
  display:inline-flex;align-items:center;justify-content:center;
  padding:7px 10px;border:1px solid var(--line-strong);
  color:var(--cyan);font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  transition:background-color 200ms var(--ease),color 200ms var(--ease);
}
.rail-cta:hover{background:rgba(56,224,206,.12);color:#fff}

.topbar{
  position:fixed;top:0;left:var(--rail-w);right:0;height:var(--topbar-h);z-index:71;
  display:flex;align-items:center;gap:clamp(10px,2vw,26px);
  padding-inline:clamp(16px,3vw,32px);
  background:rgba(7,12,17,.88);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:height 220ms var(--ease),left 220ms var(--ease);
}
.topbar-brand{display:none;align-items:center;flex:0 0 auto}
.topbar-brand-cn{font-family:var(--font-display);font-weight:800;font-size:20px;letter-spacing:.02em;color:#fff}
.topbar-readout{margin:0;font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--silent);white-space:nowrap}
.topbar-tagline{margin:0;font-size:13px;color:var(--graphite);white-space:nowrap}
.topbar-utility{display:flex;align-items:center;gap:10px;margin-left:auto}
.utility-chip{
  padding:6px 10px;border:1px solid var(--line);background:rgba(56,224,206,.05);
  color:var(--cyan);font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;white-space:nowrap;
}
.topbar-cta{padding:9px 16px;flex:0 0 auto}

.nav-toggle{display:none;align-items:center;gap:10px;flex:0 0 auto;padding:8px 12px;border:1px solid var(--line-strong);color:var(--graphite);font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;transition:color 200ms var(--ease),border-color 200ms var(--ease)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:12px}
.nav-toggle-bars::before,.nav-toggle-bars::after{content:"";position:absolute;left:0;width:100%;height:1px;background:currentColor;transition:transform 200ms var(--ease),top 200ms var(--ease)}
.nav-toggle-bars::before{top:2px}
.nav-toggle-bars::after{top:9px}
.nav-toggle:hover{color:var(--cyan)}
.nav-toggle[aria-expanded="true"]{color:var(--cyan);border-color:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:5.5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:5.5px;transform:rotate(-45deg)}

.scroll-progress{
  position:fixed;top:var(--topbar-h);left:var(--rail-w);right:0;height:2px;z-index:73;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--ember));
  pointer-events:none;transition:transform 120ms linear;
}

/* 收窄状态：隐藏次级读数、压缩留白 */
html[data-compact="true"] .rail-brand-en{display:none}
html[data-compact="true"] .rail-brand{padding-bottom:10px}
html[data-compact="true"] .rail-link{padding:9px 6px}
html[data-compact="true"] .topbar-tagline{display:none}

/* ---------- 11. Footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,10vw,120px);
  padding-top:clamp(40px,6vw,72px);
  background:linear-gradient(180deg,rgba(15,26,34,.88),rgba(7,12,17,1));
  border-top:1px solid var(--line-strong);
  color:var(--graphite);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(56,224,206,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(56,224,206,.05) 1px,transparent 1px);
  background-size:var(--unit) var(--unit);
}
.footer-shell{
  position:relative;
  display:grid;
  grid-template-columns:minmax(200px,1.5fr) repeat(3,minmax(130px,1fr)) minmax(230px,1.7fr);
  gap:clamp(20px,3vw,40px);
  align-items:start;
}
.footer-brand{display:grid;gap:0;align-content:start}
.footer-wordmark{font-family:var(--font-display);font-weight:800;font-size:clamp(26px,3.6vw,38px);line-height:1;letter-spacing:-.01em;color:#fff;margin:0}
.footer-signature{margin:12px 0 0;font-family:var(--font-serif);font-size:14px;line-height:1.8;color:var(--graphite);max-width:34ch}
.footer-coord{margin:14px 0 0;font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--cyan)}

.footer-col{display:grid;gap:0;align-content:start}
.footer-col-title{margin:0 0 14px;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.2em;text-transform:uppercase;color:var(--silent)}
.footer-col-toggle{display:flex;align-items:center;justify-content:space-between;gap:10px;width:100%;padding:0;text-align:left;font:inherit;color:inherit;letter-spacing:inherit;text-transform:inherit}
.footer-col-caret{flex:0 0 auto;width:8px;height:8px;border-right:1px solid var(--silent);border-bottom:1px solid var(--silent);transform:rotate(45deg);transition:transform 200ms var(--ease)}
.footer-col-toggle[aria-expanded="false"] .footer-col-caret{transform:rotate(-45deg)}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-link{position:relative;display:inline-block;padding-left:0;font-size:14px;color:var(--graphite);transition:color 180ms var(--ease),padding-left 180ms var(--ease)}
.footer-link::before{content:"";position:absolute;left:0;top:.72em;width:0;height:1px;background:var(--cyan);transition:width 180ms var(--ease)}
.footer-link:hover{color:var(--cyan);padding-left:10px}
.footer-link:hover::before{width:6px}

.footer-contact{display:grid;align-content:start}
.contact-list{display:flex;flex-direction:column;gap:12px}
.contact-item{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px}
.contact-label{min-width:42px;font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--silent)}
.contact-value{font-family:var(--font-mono);font-size:13px;color:#E4EDF2;word-break:break-all}
.contact-value--text{font-family:var(--font-body);font-size:14px;line-height:1.6;word-break:normal}
.copy-btn{
  flex:0 0 auto;padding:3px 8px;border:1px solid var(--line);
  color:var(--cyan);font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;
  transition:background-color 180ms var(--ease),border-color 180ms var(--ease),color 180ms var(--ease);
}
.copy-btn:hover{border-color:var(--cyan);background:rgba(56,224,206,.1)}
.copy-btn[data-copied="true"]{border-color:var(--ember);color:var(--ember)}

.footer-legal{
  position:relative;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  margin-top:clamp(28px,4vw,48px);padding-block:18px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--silent);
}
.legal-item{margin:0}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1199px){
  .topbar-tagline{display:none}
  .footer-shell{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-brand,.footer-contact{grid-column:1/-1}
}
@media (max-width:899px){
  .topbar-readout{display:none}
  .topbar-brand{display:flex}
  .topbar-utility{margin-left:auto}
  .topbar-cta{display:none}
  .nav-toggle{display:inline-flex}
  .utility-chip:nth-child(2){display:none}

  .rail{
    top:var(--topbar-h);left:0;right:0;bottom:auto;
    width:auto;height:auto;max-height:calc(100vh - var(--topbar-h));
    display:block;padding:0;
    border-right:0;border-bottom:1px solid var(--line-strong);
    box-shadow:0 26px 44px rgba(0,0,0,.55);
    overflow-y:auto;overflow-x:hidden;
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity 220ms var(--ease),transform 220ms var(--ease),visibility 220ms var(--ease);
  }
  .rail[data-open="true"]{opacity:1;visibility:visible;transform:translateY(0)}
  .rail-brand{display:none}
  .rail-list{
    flex-direction:row;align-items:stretch;gap:0;
    width:auto;padding:8px 12px;
    overflow-x:auto;scroll-snap-type:x proximity;
    -webkit-overflow-scrolling:touch;
  }
  .rail-item{flex:0 0 auto;width:auto}
  .rail-link{
    flex-direction:row;align-items:center;gap:8px;
    width:auto;padding:10px 14px;
    border-left:0;border-bottom:2px solid transparent;
    scroll-snap-align:start;
  }
  .rail-link[aria-current="page"]{
    border-left-color:transparent;
    border-bottom-color:var(--cyan);
    background:linear-gradient(180deg,rgba(56,224,206,.16),rgba(56,224,206,.02));
  }
  .rail-name{writing-mode:horizontal-tb;font-size:14px}
  .rail-foot{
    flex-direction:row;align-items:center;justify-content:space-between;
    gap:12px;margin-top:0;padding:12px 16px;border-top:1px solid var(--line);
  }
  .footer-shell{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:639px){
  .topbar-utility{display:none}
  .topbar-brand{margin-right:auto}
  .footer-shell{grid-template-columns:1fr}
  .footer-brand,.footer-contact{grid-column:auto}
  .footer-legal{flex-direction:column;align-items:flex-start}
}
@media (max-width:899px) and (min-width:640px){
  .topbar-brand{margin-right:auto}
}

/* ---------- 13. 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;
  }
  .js-ready [data-reveal]{transform:none;opacity:1}
  body{transition:none}
  .scroll-progress{transition:none}
}