:root{
  --ink-950:#0B0918;
  --ink-800:#1A1430;
  --paper-100:#F3E9DA;
  --violet-500:#A25BFF;
  --cyan-400:#35E0F0;
  --orange-500:#FF8A3C;
  --lime-400:#B8FF4A;
  --sand-400:#C9BCA6;
  --ink-cyan:#0E2B33;
  --paper-0:#FFFDF8;

  --bg:var(--ink-950);
  --fg:var(--paper-0);
  --muted:var(--sand-400);
  --edge:rgba(201,188,166,.22);
  --edge-strong:rgba(162,91,255,.45);

  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;

  --rail-w:96px;
  --topbar-h:64px;
  --pad-x:clamp(16px,3.6vw,56px);
  --content-max:1240px;
  --radius-organic:26px;
  --radius-block:12px;
  --focus:var(--cyan-400);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  padding-left:var(--rail-w);
  background:var(--bg);
  color:var(--fg);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p,figure,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit}

/* 底层材质：像素网格 + 漂移扫描线 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(162,91,255,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(162,91,255,.055) 1px,transparent 1px);
  background-size:8px 8px;
}
body::after{
  content:"";
  position:fixed;
  inset:-20% 0;
  z-index:0;
  pointer-events:none;
  background:repeating-linear-gradient(180deg,rgba(53,224,240,.045) 0 1px,transparent 1px 7px);
  animation:scan 11s linear infinite;
}
@keyframes scan{
  from{transform:translateY(-8%)}
  to{transform:translateY(8%)}
}

main{display:block;position:relative;z-index:1}
#main-content{scroll-margin-top:calc(var(--topbar-h) + 16px)}

/* 无障碍 */
.visually-hidden{
  position:absolute;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}
.skip-link{
  position:fixed;
  left:12px;
  top:-90px;
  z-index:200;
  padding:12px 20px;
  background:var(--lime-400);
  color:var(--ink-950);
  font-size:14px;
  font-weight:700;
  letter-spacing:.08em;
  text-decoration:none;
  border-radius:10px;
  transition:top .18s ease-out;
}
.skip-link:focus{top:12px}

:focus-visible{
  outline:2px solid var(--focus);
  outline-offset:2px;
  border-radius:4px;
}

/* ============ 头部：边框式导航 ============ */
.site-header{position:relative;z-index:40}

.rail{
  position:fixed;
  inset:0 auto 0 0;
  z-index:60;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:22px;
  padding:24px 10px 28px;
  background:linear-gradient(180deg,var(--ink-800) 0%,var(--ink-950) 78%);
  border-right:1px solid var(--edge);
}
.rail__brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--paper-0);
}
.rail__pixel{
  width:14px;
  height:14px;
  flex:none;
  background:conic-gradient(
    var(--orange-500) 0 25%,
    var(--violet-500) 0 50%,
    var(--cyan-400) 0 75%,
    var(--paper-100) 0
  );
  animation:pixelSwap 6.5s steps(4,end) infinite;
}
@keyframes pixelSwap{
  0%{transform:rotate(0deg)}
  100%{transform:rotate(360deg)}
}
.rail__name{
  writing-mode:vertical-rl;
  font-size:14px;
  font-weight:700;
  letter-spacing:.2em;
  line-height:1.1;
}
.rail__index{
  writing-mode:vertical-rl;
  color:var(--sand-400);
}
.rail__status{
  margin-top:auto;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:10px;
}
.rail__status-text{
  writing-mode:vertical-rl;
  font-size:11px;
  letter-spacing:.2em;
  color:var(--sand-400);
}
.dot{
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--lime-400);
  box-shadow:0 0 0 4px rgba(184,255,74,.16);
  animation:breathe 2.4s ease-in-out infinite;
}
@keyframes breathe{
  0%,100%{opacity:.6}
  50%{opacity:1}
}

/* 顶部像素标签栏 */
.topbar{
  position:sticky;
  top:0;
  z-index:50;
  display:flex;
  align-items:center;
  gap:14px;
  min-height:var(--topbar-h);
  padding:10px var(--pad-x);
  background:rgba(11,9,24,.88);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--edge);
}
.topbar__actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex:none;
}
.topbar__progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:linear-gradient(90deg,var(--violet-500),var(--cyan-400));
  transform:scaleX(0);
  transform-origin:0 50%;
  will-change:transform;
}

.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  flex:none;
  padding:0;
  background:transparent;
  border:1px solid var(--edge);
  border-radius:var(--radius-block);
  cursor:pointer;
  transition:border-color .16s ease-out,background-color .16s ease-out;
}
.nav-toggle:hover{
  border-color:var(--violet-500);
  background:var(--ink-800);
}
.nav-toggle__bars{
  position:relative;
  width:20px;
  height:2px;
  background:var(--paper-0);
}
.nav-toggle__bars::before{
  content:"";
  position:absolute;
  left:0;
  top:-6px;
  width:20px;
  height:2px;
  background:var(--paper-0);
  box-shadow:0 12px 0 var(--paper-0);
}

.topnav{
  flex:1 1 auto;
  min-width:0;
}
.topnav__list{
  display:flex;
  align-items:center;
  gap:6px;
  margin:-6px -2px;
  padding:6px 2px;
  overflow-x:auto;
  overscroll-behavior-x:contain;
  scrollbar-width:none;
  cursor:grab;
}
.topnav__list::-webkit-scrollbar{display:none}
.topnav__list:active{cursor:grabbing}
.topnav__list *{user-select:none}
.topnav__link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 14px;
  border-radius:999px;
  border:1px solid transparent;
  color:var(--sand-400);
  font-size:14px;
  letter-spacing:.06em;
  white-space:nowrap;
  text-decoration:none;
  transition:color .16s ease-out,background-color .16s ease-out,border-color .16s ease-out,transform .16s ease-out;
}
.topnav__link:hover{
  color:var(--paper-0);
  background:var(--ink-800);
  border-color:var(--edge-strong);
  transform:translateY(-2px);
}
.topnav__link[aria-current="page"]{
  background:var(--paper-100);
  border-color:var(--paper-100);
  color:var(--ink-950);
  font-weight:700;
}
.topnav__link[aria-current="page"]::before{
  content:"";
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--lime-400);
  box-shadow:0 0 0 3px rgba(184,255,74,.3);
}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:40px;
  padding:0 18px;
  border-radius:var(--radius-block);
  border:1px solid var(--edge);
  font-size:14px;
  font-weight:700;
  letter-spacing:.08em;
  text-decoration:none;
  white-space:nowrap;
  transition:transform .16s ease-out,border-color .16s ease-out,background-color .16s ease-out,color .16s ease-out;
}
.btn--ghost{
  border-color:var(--cyan-400);
  color:var(--cyan-400);
}
.btn--ghost:hover{
  background:rgba(53,224,240,.14);
  transform:translateY(-2px);
}
.btn--solid{
  border-color:var(--violet-500);
  background:var(--violet-500);
  color:var(--ink-950);
}
.btn--solid:hover{
  background:#b57bff;
  transform:translateY(-2px);
}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  z-index:20;
  margin-top:clamp(56px,8vw,132px);
  background:linear-gradient(180deg,var(--ink-950) 0%,var(--ink-800) 100%);
  border-top:1px solid var(--edge);
  color:var(--paper-0);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(53,224,240,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(53,224,240,.05) 1px,transparent 1px);
  background-size:8px 8px;
}
.footer__grid{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1.4fr) minmax(0,.9fr) minmax(0,1.3fr);
  gap:clamp(24px,4vw,64px);
  padding-top:clamp(36px,5vw,72px);
  padding-bottom:clamp(28px,4vw,56px);
}
.footer__logo{
  font-size:clamp(20px,2.2vw,26px);
  font-weight:800;
  letter-spacing:.04em;
}
.footer__tagline{
  margin-top:10px;
  max-width:26ch;
  font-size:15px;
  color:var(--sand-400);
  line-height:1.7;
}
.footer__cycle{
  margin-top:18px;
}
.footer__list{
  margin-top:14px;
  display:flex;
  flex-direction:column;
  gap:10px;
  font-size:15px;
  color:var(--sand-400);
}
.footer__list a{
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s ease-out,border-color .16s ease-out;
}
.footer__list a:hover{
  color:var(--cyan-400);
  border-bottom-color:var(--cyan-400);
}
.footer__contact .footer__list{font-size:14px;line-height:1.6}
.footer__base{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-top:20px;
  padding-bottom:28px;
  border-top:1px solid var(--edge);
  font-size:13px;
  color:var(--sand-400);
}
.footer__icp{letter-spacing:.08em}

/* ============ 排版 ============ */
.display-xl{
  font-size:clamp(52px,8.5vw,148px);
  font-weight:300;
  line-height:.95;
  letter-spacing:-.02em;
  text-shadow:
    2px 2px 0 rgba(162,91,255,.85),
    4px 4px 0 rgba(53,224,240,.35),
    6px 6px 0 rgba(11,9,24,.9);
}
.display-md{
  font-size:clamp(28px,3.4vw,44px);
  font-weight:800;
  line-height:1.12;
  letter-spacing:0;
}
.index-label{
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--sand-400);
}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum";
}
.lede{
  max-width:56ch;
  font-size:clamp(16px,1.4vw,18px);
  line-height:1.8;
  color:var(--sand-400);
}
.rule{
  height:1px;
  border:0;
  background:linear-gradient(90deg,var(--edge-strong),transparent);
}

/* ============ 布局工具 ============ */
.wrap{
  width:100%;
  max-width:var(--content-max);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}
.section{
  position:relative;
  padding-block:clamp(40px,5.5vw,88px);
}
.band{
  position:relative;
  padding-block:clamp(28px,3.5vw,52px);
  border-block:1px solid var(--edge);
  background:linear-gradient(90deg,rgba(26,20,48,.9),rgba(14,43,51,.9));
}
.grid{
  display:grid;
  gap:clamp(18px,2.4vw,32px);
}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}

/* ============ 基础组件 ============ */
.panel{
  padding:clamp(20px,3vw,34px);
  background:var(--ink-800);
  border:1px solid var(--edge);
  border-radius:var(--radius-organic);
}
.panel--paper{
  background:var(--paper-100);
  color:var(--ink-950);
  border-color:rgba(11,9,24,.08);
}
.panel--cyan{
  background:var(--ink-cyan);
  border-color:rgba(53,224,240,.35);
}

.databar{
  height:8px;
  border-radius:999px;
  background:rgba(201,188,166,.18);
  overflow:hidden;
}
.databar__fill{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--violet-500),var(--cyan-400));
  transition:width .6s ease-out;
}

.tagrow{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 13px;
  border-radius:999px;
  border:1px solid var(--edge);
  background:transparent;
  color:var(--sand-400);
  font-size:13px;
  letter-spacing:.08em;
  cursor:pointer;
  transition:color .16s ease-out,border-color .16s ease-out,background-color .16s ease-out,transform .16s ease-out;
}
.tag:hover{
  color:var(--paper-0);
  border-color:var(--edge-strong);
  transform:translateY(-2px);
}
.tag[aria-pressed="true"],
.tag[data-active]{
  background:var(--violet-500);
  border-color:var(--violet-500);
  color:var(--ink-950);
  font-weight:700;
}

.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-size:12px;
  letter-spacing:.16em;
  color:var(--sand-400);
}
.crumbs li{display:inline-flex;align-items:center;gap:10px}
.crumbs li::after{
  content:"/";
  color:rgba(201,188,166,.45);
}
.crumbs li:last-child::after{content:""}
.crumbs a{text-decoration:none}
.crumbs a:hover{color:var(--cyan-400)}

/* 响应式图片容器基础规则 */
.figure{
  position:relative;
  margin:0;
  border-radius:var(--radius-organic);
  overflow:hidden;
  background:var(--ink-800);
  border:1px solid var(--edge);
}
.figure__media{
  display:block;
  width:100%;
  aspect-ratio:16/9;
  object-fit:cover;
  background:
    linear-gradient(135deg,var(--ink-800) 0%,var(--ink-cyan) 62%,rgba(162,91,255,.4) 100%);
}
.figure__cap{
  padding:12px 18px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--sand-400);
  border-top:1px solid var(--edge);
}
.figure--tilt{transform:rotate(-1.4deg)}
.figure--tilt:hover{transform:rotate(-0.4deg)}

/* 显现动画 */
.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s ease-out,transform .5s ease-out;
}
[data-reveal].is-in{
  opacity:1;
  transform:none;
}

/* ============ 响应式 ============ */
@media (max-width:1200px) and (min-width:901px){
  :root{--rail-w:76px}
  .rail__name{font-size:13px}
}

@media (max-width:900px){
  :root{
    --pad-x:clamp(16px,4.4vw,28px);
    --radius-organic:20px;
  }
  body{padding-left:0}
  .rail{
    position:static;
    inset:auto;
    width:auto;
    flex-direction:row;
    align-items:center;
    gap:14px;
    padding:14px var(--pad-x);
    background:linear-gradient(90deg,var(--ink-800),var(--ink-950));
    border-right:0;
    border-bottom:1px solid var(--edge);
  }
  .rail__brand{flex-direction:row}
  .rail__name{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.12em;
  }
  .rail__index,
  .rail__status{display:none}
  .topbar{position:sticky;top:0}
  .nav-toggle{display:inline-flex}
  .topnav{position:static;flex:0 1 auto}
  .topnav__list{display:none}
  .topnav[data-open] .topnav__list{
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:4px;
    position:absolute;
    left:0;
    right:0;
    top:100%;
    margin:0;
    padding:14px var(--pad-x) 22px;
    background:var(--ink-800);
    border-bottom:1px solid var(--violet-500);
    box-shadow:0 26px 44px rgba(0,0,0,.55);
    overflow-x:hidden;
    overflow-y:auto;
    max-height:70vh;
    cursor:auto;
  }
  .topnav__link{
    width:100%;
    padding:12px 14px;
    border-radius:var(--radius-block);
    font-size:15px;
  }
  .topnav__link:hover{transform:none}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__brand{grid-column:1 / -1}
}

@media (max-width:640px){
  body{font-size:16px}
  .topbar{gap:8px}
  .btn{
    min-height:36px;
    padding:0 12px;
    font-size:13px;
    letter-spacing:.04em;
  }
  .topbar__actions{gap:6px}
  .footer__grid{grid-template-columns:1fr}
  .footer__base{justify-content:flex-start}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
}

/* ============ 动效偏好 ============ */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  body::after{animation:none}
  .dot{animation:none;opacity:1}
  .rail__pixel{animation:none}
  .js-reveal [data-reveal]{opacity:1;transform:none;transition:none}
  .btn:hover,
  .topnav__link:hover,
  .tag:hover,
  .figure--tilt:hover{transform:none}
  .databar__fill{transition:none}
}