@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@300;400;500;600;700&family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

:root{
  --ink:#1c1726;
  --ink-2:#2b2440;
  --violet:#6514ff;
  --magenta:#bf00ff;
  --lilac:#efe7ff;
  --paper:#f7f3ff;
  --line:#d9ccf5;
  --mute:#a99fc4;
  --r:18px;
  --sans:'Archivo','Space Grotesk',system-ui,-apple-system,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --disp:'Space Grotesk','Archivo',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
}

*,*::before,*::after{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  font-family:var(--sans);
  font-size:17px;
  line-height:1.7;
  color:var(--ink);
  background:var(--paper);
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:-10%;
  z-index:-1;
  pointer-events:none;
  background-image:repeating-linear-gradient(135deg,rgba(101,20,255,.07) 0 2px,transparent 2px 26px);
  background-size:220% 220%;
  animation:drift 24s linear infinite;
}

@keyframes drift{
  to{background-position:220% 0}
}

a{color:inherit}

/* ---------- 顶部条 ---------- */
.bar{
  position:sticky;
  top:0;
  z-index:60;
  display:flex;
  align-items:center;
  gap:14px;
  padding:10px clamp(14px,4vw,40px);
  background:var(--ink);
  color:#fff;
  border-bottom:4px solid var(--violet);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:6px 0;
  font-family:var(--disp);
  font-weight:700;
  font-size:20px;
  letter-spacing:-.01em;
  text-decoration:none;
  color:#fff;
  white-space:nowrap;
}

.brand-dot{
  width:15px;
  height:15px;
  border-radius:5px;
  background:var(--magenta);
  box-shadow:0 0 0 4px rgba(191,0,255,.28);
}

.burger{
  display:none;
  margin-left:auto;
  min-height:44px;
  padding:10px 16px;
  font:inherit;
  font-weight:600;
  color:#fff;
  background:transparent;
  border:2px solid rgba(239,231,255,.35);
  border-radius:12px;
  cursor:pointer;
}

.menu{
  display:flex;
  align-items:center;
  gap:4px;
  margin-left:auto;
}

.m-link,.drop-btn{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 13px;
  font:inherit;
  font-weight:500;
  font-size:16px;
  color:#efe7ff;
  text-decoration:none;
  background:transparent;
  border:0;
  border-radius:12px;
  cursor:pointer;
  transition:background .22s ease,color .22s ease;
}

.m-link:hover,.m-link:focus-visible,.drop-btn:hover,.drop.open .drop-btn{
  background:var(--violet);
  color:#fff;
}

.drop{position:relative;display:inline-flex}

.drop-panel{
  position:absolute;
  top:calc(100% + 10px);
  left:0;
  min-width:200px;
  display:flex;
  flex-direction:column;
  padding:8px;
  background:#fff;
  border-radius:14px;
  box-shadow:0 16px 40px rgba(28,23,38,.28);
  opacity:0;
  visibility:hidden;
  transform:translateY(-8px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s;
}

.drop:hover .drop-panel,
.drop:focus-within .drop-panel,
.drop.open .drop-panel{
  opacity:1;
  visibility:visible;
  transform:none;
}

.d-link{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:10px 12px;
  font-size:16px;
  color:var(--ink);
  text-decoration:none;
  border-radius:10px;
  transition:background .2s ease,color .2s ease;
}

.d-link:hover,.d-link:focus-visible{
  background:var(--lilac);
  color:var(--violet);
}

.cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 20px;
  font-weight:700;
  font-size:16px;
  color:#fff;
  text-decoration:none;
  background:var(--magenta);
  border-radius:999px;
  transition:transform .2s ease,background .2s ease;
}

.cta:hover,.cta:focus-visible{
  background:var(--violet);
  transform:translateY(-2px);
}

/* ---------- 布局骨架 ---------- */
.wrap{
  max-width:1180px;
  margin:0 auto;
  padding:clamp(16px,3vw,34px) clamp(14px,4vw,40px);
}

.stage{
  display:grid;
  grid-template-columns:minmax(0,1fr) 296px;
  gap:clamp(20px,3vw,44px);
  align-items:start;
}

.doc{min-width:0}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  overflow:hidden;
  min-height:70vh;
  display:flex;
  align-items:center;
  padding:clamp(26px,5vw,64px);
  background:var(--ink);
  color:#fff;
  border-radius:26px;
}

.ghost{
  position:absolute;
  left:-.05em;
  bottom:-.18em;
  font-family:var(--disp);
  font-weight:700;
  font-size:clamp(66px,19vw,200px);
  line-height:.86;
  letter-spacing:-.04em;
  color:var(--magenta);
  opacity:.24;
  white-space:nowrap;
  pointer-events:none;
}

.hero-copy{
  position:relative;
  z-index:1;
  display:flex;
  align-items:center;
  gap:clamp(16px,3vw,36px);
  flex-wrap:wrap;
}

.hero-text{
  display:flex;
  flex-direction:column;
  gap:16px;
  min-width:0;
}

.hero h1{
  margin:0;
  font-family:var(--disp);
  font-size:clamp(30px,5.4vw,58px);
  line-height:1.06;
  letter-spacing:-.03em;
  font-weight:700;
}

.lead{
  margin:0;
  max-width:54ch;
  font-size:clamp(16px,1.9vw,19px);
  line-height:1.6;
  color:#d5c9f2;
}

.hero-art{
  width:clamp(84px,12vw,124px);
  height:auto;
  border-radius:var(--r);
  display:block;
  flex:0 0 auto;
}

.hero-art-geo{
  height:clamp(84px,12vw,124px);
  background:linear-gradient(135deg,var(--violet),var(--magenta));
  box-shadow:0 14px 34px rgba(191,0,255,.35);
  transform:rotate(-6deg);
}

/* ---------- 正文 ---------- */
.body{
  margin-top:clamp(26px,5vw,54px);
  display:flex;
  flex-direction:column;
  gap:clamp(24px,4vw,46px);
}

.body > section{
  background:#fff;
  border-radius:var(--r);
  padding:clamp(22px,3.4vw,44px);
  scroll-margin-top:96px;
}

.body > section:nth-child(even){
  background:var(--lilac);
}

.body h2{
  margin:0;
  font-family:var(--disp);
  font-size:clamp(24px,3.6vw,36px);
  line-height:1.15;
  letter-spacing:-.02em;
}

.body h2 + hr{
  width:76px;
  height:8px;
  margin:16px 0 24px;
  border:0;
  border-radius:99px;
  background:linear-gradient(90deg,var(--violet),var(--magenta));
}

.body h3{
  margin:28px 0 10px;
  font-family:var(--disp);
  font-size:clamp(19px,2.4vw,24px);
  line-height:1.3;
}

.body hr{
  margin:28px 0;
  border:0;
  height:1px;
  background:var(--line);
}

.body p{margin:0 0 16px}
.body p:last-child{margin-bottom:0}

.body a{
  color:var(--violet);
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
  transition:color .2s ease;
}

.body a:hover{color:var(--magenta)}

.body ul,.body ol{
  margin:0 0 16px;
  padding-left:1.25em;
}

.body li{margin:.35em 0}

.body blockquote{
  margin:24px 0;
  padding:14px 22px;
  background:var(--paper);
  border-left:6px solid var(--magenta);
  border-radius:0 14px 14px 0;
}

.body blockquote p:last-child{margin:0}

.body table{
  width:100%;
  border-collapse:collapse;
  margin:20px 0;
  font-size:.96em;
}

.body th,.body td{
  padding:10px 12px;
  text-align:left;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}

.body img{
  max-width:100%;
  height:auto;
  border-radius:14px;
}

.body strong{font-weight:700;color:var(--ink)}

/* ---------- 侧栏 ---------- */
.side{
  position:sticky;
  top:92px;
  padding:22px 20px;
  background:var(--ink);
  color:#efe7ff;
  border-radius:var(--r);
}

.side h2{
  margin:0;
  font-family:var(--disp);
  font-size:18px;
  letter-spacing:.02em;
}

.side h2 + hr{
  width:44px;
  height:5px;
  margin:12px 0 16px;
  border:0;
  border-radius:99px;
  background:var(--magenta);
}

.toc{
  margin:0;
  padding:0;
  list-style:none;
  counter-reset:toc;
}

.toc li{margin:0 0 4px}

.toc a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:9px 12px;
  font-size:16px;
  color:#cbbfe8;
  text-decoration:none;
  border-radius:10px;
  transition:background .2s ease,color .2s ease;
}

.toc a:hover,.toc a:focus-visible{
  background:var(--violet);
  color:#fff;
}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:clamp(40px,7vw,88px);
  padding:clamp(34px,6vw,68px) clamp(14px,4vw,40px) 22px;
  background:var(--ink);
  color:#efe7ff;
  border-top:6px solid var(--violet);
}

.foot-in{max-width:1180px;margin:0 auto}

.foot-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:clamp(18px,3vw,40px);
  padding-bottom:clamp(22px,4vw,36px);
  border-bottom:1px solid rgba(239,231,255,.18);
}

.foot-brand{
  margin:0;
  font-family:var(--disp);
  font-weight:700;
  font-size:clamp(38px,5.6vw,74px);
  line-height:.92;
  letter-spacing:-.04em;
  color:var(--magenta);
  word-break:break-all;
}

.foot-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(14px,2.4vw,32px);
}

.foot dl{margin:0}
.foot dt{margin:0}
.foot dd{margin:0}

.foot dt a,.foot dd a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:8px 0;
  font-size:16px;
  text-decoration:none;
  color:#cbbfe8;
  transition:color .2s ease;
}

.foot dt a{font-weight:700;color:#fff}

.foot dt a:hover,.foot dd a:hover,
.foot dt a:focus-visible,.foot dd a:focus-visible{
  color:var(--magenta);
  text-decoration:underline;
  text-underline-offset:3px;
}

.foot-legal{
  margin:18px 0 0;
  font-size:16px;
  color:var(--mute);
}

/* ---------- 滚动浮现 ---------- */
.js .rv,
.js .body > section{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .45s ease,transform .45s cubic-bezier(.2,.7,.3,1);
}

.js .rv.in,
.js .body > section.in{
  opacity:1;
  transform:none;
}

/* ---------- 响应式 ---------- */
@media (max-width:980px){
  .stage{grid-template-columns:minmax(0,1fr)}
  .side{position:static;order:2}
  .foot-grid{grid-template-columns:1.2fr 1fr 1fr}
}

@media (max-width:860px){
  .burger{display:inline-flex}
  .menu{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    margin:0;
    padding:12px clamp(14px,4vw,40px) 18px;
    background:var(--ink);
    border-bottom:4px solid var(--magenta);
    box-shadow:0 20px 40px rgba(28,23,38,.35);
  }
  .bar.open .menu{display:flex}
  .m-link,.d-link{padding:12px 14px;min-height:46px}
  .drop{display:block}
  .drop-btn{display:none}
  .drop-panel{
    position:static;
    opacity:1;
    visibility:visible;
    transform:none;
    min-width:0;
    padding:0;
    background:transparent;
    box-shadow:none;
  }
  .drop-panel .d-link{color:#efe7ff}
  .drop-panel .d-link:hover{background:var(--violet);color:#fff}
  .cta{margin-left:auto}
  .hero{min-height:auto;padding-top:clamp(30px,8vw,54px);padding-bottom:clamp(40px,10vw,64px)}
}

@media (max-width:620px){
  .foot-grid{grid-template-columns:1fr 1fr}
  .foot-brand{grid-column:1 / -1}
  .foot-nav{grid-template-columns:1fr 1fr;grid-column:1 / -1}
  .hero-copy{gap:18px}
  .hero-art{width:76px}
  .hero-art-geo{height:76px}
}

@media (max-width:420px){
  .brand{font-size:17px}
  .cta{padding:10px 15px}
  .ghost{font-size:64px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  body::before{animation:none}
  .js .rv,.js .body > section{opacity:1;transform:none;transition:none}
  .cta,.m-link,.d-link,.toc a,.foot a,.body a{transition:none}
  .hero-art-geo{transform:none}
}

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