:root{
  --ink:#0d0d0d;
  --ink-2:#141019;
  --violet:#8000ff;
  --magenta:#ff00ff;
  --paper:#eae4ff;
  --dim:#a79fc4;
  --line:rgba(128,0,255,.4);
  --soft:rgba(128,0,255,.12);
  --r:18px;
  --hud:126px;
}
*{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  background:var(--ink);
}
body{
  margin:0;
  color:var(--paper);
  font-family:'Public Sans',system-ui,-apple-system,'Segoe UI','Noto Sans SC',sans-serif;
  font-size:17px;
  line-height:1.78;
  letter-spacing:.01em;
  overflow-x:hidden;
  background:
    radial-gradient(circle at 10% 6%,rgba(128,0,255,.22),transparent 54%),
    radial-gradient(circle at 88% 24%,rgba(255,0,255,.15),transparent 48%),
    var(--ink);
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:9;
  pointer-events:none;
  opacity:.6;
  background:
    repeating-linear-gradient(to bottom,rgba(255,255,255,.05) 0 1px,transparent 1px 4px),
    radial-gradient(circle at 1px 1px,rgba(128,0,255,.28) 1.2px,transparent 1.8px);
  background-size:auto,28px 28px;
}
h1,h2,h3,.brand,.cta,.hero-mark{font-family:'Lexend Mega','Public Sans',system-ui,sans-serif}
p{margin:0 0 1.05em}
p:last-child{margin-bottom:0}
a{color:#ff7bff;text-decoration:underline;text-decoration-color:rgba(255,0,255,.5);text-underline-offset:3px}
a:hover{color:#fff}
img{display:block;max-width:100%;height:auto}
ul,ol{margin:0 0 1.05em;padding-left:1.25em}
li{margin:0 0 .4em}
strong{color:#fff}

/* ── 顶部 HUD ── */
.hud{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(13,13,13,.86);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.hud-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:11px clamp(14px,3.2vw,40px);
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  color:#fff;
  text-decoration:none;
  font-size:18px;
  letter-spacing:.07em;
  text-shadow:0 0 14px rgba(255,0,255,.7);
}
.brand-logo{border-radius:8px}
.cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 20px;
  border-radius:999px;
  background:linear-gradient(100deg,var(--violet),var(--magenta));
  color:#0d0d0d;
  font-size:16px;
  font-weight:800;
  text-decoration:none;
  white-space:nowrap;
  box-shadow:0 0 20px rgba(255,0,255,.55);
}
.cta:hover{color:#0d0d0d;box-shadow:0 0 28px rgba(255,0,255,.9)}
.dock{
  border-top:1px solid rgba(128,0,255,.22);
  padding:8px 0 9px;
}
.dock ol{
  display:flex;
  gap:8px;
  margin:0;
  padding:0 clamp(14px,3.2vw,40px);
  list-style:none;
  overflow-x:auto;
  scrollbar-width:thin;
  scrollbar-color:var(--violet) transparent;
}
.dock ol::-webkit-scrollbar{height:4px}
.dock ol::-webkit-scrollbar-thumb{background:var(--violet);border-radius:4px}
.dock li{flex:0 0 auto;margin:0}
.dock a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:0 16px;
  border-radius:999px;
  border:1px solid var(--line);
  background:var(--soft);
  color:var(--paper);
  font-size:16px;
  white-space:nowrap;
  text-decoration:none;
  transition:background .22s,border-color .22s,box-shadow .22s,color .22s;
}
.dock a:hover,.dock a:focus-visible{
  color:#fff;
  border-color:var(--magenta);
  background:rgba(255,0,255,.18);
  box-shadow:0 0 16px rgba(255,0,255,.5);
}

/* ── 首屏 ── */
.hero{
  position:relative;
  display:flex;
  flex-direction:column;
  justify-content:flex-end;
  min-height:100vh;
  min-height:100svh;
  padding:calc(var(--hud) + 18px) clamp(16px,4vw,52px) clamp(52px,8vw,104px);
  overflow:hidden;
  clip-path:polygon(0 0,100% 0,100% 94.5%,0 100%);
  background:linear-gradient(160deg,#170f22,#0d0d0d 70%);
}
.hero-media{
  position:absolute;
  inset:0;
  margin:0;
  z-index:0;
}
.hero-img{
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.62;
  filter:saturate(1.2) contrast(1.08);
}
.hero-media::after{
  content:"";
  position:absolute;
  inset:0;
  background:
    linear-gradient(180deg,rgba(13,13,13,.6),rgba(13,13,13,.28) 42%,rgba(13,13,13,.96) 94%),
    linear-gradient(104deg,rgba(128,0,255,.55),transparent 62%);
}
.hero-copy{position:relative;z-index:2;max-width:920px}
.hero-mark{
  margin:0 0 12px;
  font-size:16px;
  letter-spacing:.34em;
  color:#ff9bff;
  text-shadow:0 0 14px var(--magenta);
}
h1{
  margin:0;
  font-size:clamp(2.05rem,7vw,4.6rem);
  line-height:1.05;
  letter-spacing:-.015em;
  color:#fff;
  text-shadow:0 0 18px rgba(255,0,255,.65),0 0 48px rgba(128,0,255,.7);
  animation:glitch 7s steps(1) infinite;
}
@keyframes glitch{
  0%,91%,100%{transform:none}
  92%{transform:skewX(-2.6deg) translateX(-3px)}
  94%{transform:skewX(1.8deg) translateX(3px)}
  96%{transform:none}
  97%{transform:skewX(-1.2deg)}
  98%{transform:none}
}

/* ── 主舞台 ── */
.stage{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(26px,4vw,52px);
  max-width:1180px;
  margin:0 auto;
  padding:clamp(38px,6vw,76px) clamp(16px,4vw,52px) clamp(30px,5vw,60px);
}
.content{min-width:0}
.content > section{
  position:relative;
  margin:0 0 clamp(20px,3vw,30px);
  padding:clamp(20px,3vw,36px);
  border:1px solid var(--line);
  border-radius:var(--r);
  background:linear-gradient(168deg,rgba(128,0,255,.14),rgba(20,16,25,.92) 58%);
  box-shadow:0 22px 46px -34px rgba(255,0,255,.7);
  overflow:hidden;
  scroll-margin-top:calc(var(--hud) + 16px);
}
.content > section::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:3px;
  background:linear-gradient(90deg,var(--violet),var(--magenta),var(--violet));
}
.content h2{
  margin:0 0 12px;
  font-size:clamp(1.24rem,3vw,1.72rem);
  line-height:1.28;
  color:#fff;
  text-shadow:0 0 16px rgba(128,0,255,.85);
}
.content h3{
  margin:1.4em 0 .6em;
  font-size:1.08rem;
  line-height:1.4;
  color:#ffd9ff;
  letter-spacing:.02em;
}
hr{
  border:0;
  height:2px;
  margin:0 0 18px;
  background:linear-gradient(90deg,rgba(255,0,255,.85),rgba(128,0,255,.12));
}
blockquote{
  margin:1.2em 0;
  padding:10px 0 10px 18px;
  border-left:3px solid var(--magenta);
  color:#f0e8ff;
  background:rgba(255,0,255,.07);
}
figure{margin:1.2em 0}
figcaption{font-size:16px;color:var(--dim);margin-top:8px}
table{width:100%;border-collapse:collapse;margin:1.2em 0;font-size:16px}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left}
th{background:rgba(128,0,255,.18);color:#fff}
code{font-size:16px;background:rgba(255,0,255,.14);padding:2px 6px;border-radius:6px}

/* ── 右侧栏 ── */
.rail{
  border-left:1px dashed rgba(255,0,255,.4);
  padding:2px 0 2px 20px;
}
.rail h2{
  margin:0 0 10px;
  font-size:1rem;
  letter-spacing:.1em;
  color:#fff;
  text-shadow:0 0 14px rgba(255,0,255,.6);
}
.rail hr{margin:0 0 14px}
.rail-list{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.rail-list li{margin:0}
.rail-list a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:0 12px;
  border:1px solid transparent;
  border-radius:10px;
  color:var(--dim);
  font-size:16px;
  text-decoration:none;
  transition:color .2s,border-color .2s,background .2s;
}
.rail-list a:hover{color:#fff;border-color:var(--line);background:rgba(128,0,255,.14)}

/* ── 回到顶部 ── */
.totop{
  position:fixed;
  right:14px;
  bottom:14px;
  z-index:70;
  display:none;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 18px;
  border-radius:999px;
  border:1px solid var(--magenta);
  background:rgba(13,13,13,.92);
  color:#fff;
  font-size:16px;
  text-decoration:none;
  box-shadow:0 0 20px rgba(255,0,255,.55);
}
.totop.show{display:inline-flex}

/* ── 页脚 ── */
.foot{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 20px;
  margin-top:14px;
  padding:20px clamp(16px,4vw,52px) 36px;
  border-top:1px solid var(--line);
  background:rgba(13,13,13,.92);
}
.foot-brand a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  color:#fff;
  font-family:'Lexend Mega',sans-serif;
  font-size:16px;
  letter-spacing:.08em;
  text-decoration:none;
  text-shadow:0 0 12px rgba(128,0,255,.8);
}
.foot-brand a:hover{color:#ff9bff}
.foot-nav ol{
  display:flex;
  flex-wrap:wrap;
  gap:2px 10px;
  margin:0;
  padding:0;
  list-style:none;
}
.foot-nav li{margin:0}
.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 6px;
  color:var(--dim);
  font-size:16px;
  text-decoration:none;
}
.foot-nav a:hover{color:#ff9bff}
.foot-copy p{margin:0;font-size:16px;color:#7f7796}

/* ── 滚动显现 ── */
.rv{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s ease}
.rv.on{opacity:1;transform:none}

/* ── 断点 ── */
@media(min-width:900px){
  .stage{grid-template-columns:minmax(0,1fr) 262px;align-items:start}
  .rail{position:sticky;top:calc(var(--hud) + 18px)}
}
@media(max-width:899px){
  .rail{border-left:0;border-top:1px dashed rgba(255,0,255,.35);padding:18px 0 0}
  .rail-list{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));display:grid;gap:8px}
}
@media(max-width:520px){
  :root{--hud:112px}
  body{font-size:17px}
  .hud-bar{padding:8px 14px}
  .brand{font-size:16px}
  .cta{padding:0 15px;font-size:16px}
  .hero{clip-path:polygon(0 0,100% 0,100% 97%,0 100%)}
  .foot{flex-direction:column;align-items:flex-start;gap:4px}
  .foot-copy{align-self:center}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  h1{animation:none}
  .rv{opacity:1;transform:none;transition:none}
  .dock a,.rail-list a,.cta{transition:none}
}

button[aria-expanded]{min-width:44px;min-height:44px}