@import url('https://fonts.googleapis.com/css2?family=Calistoga:ital@0;1&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  --purple:#6514ff;
  --magenta:#bf00ff;
  --ink:#1c1726;
  --paper:#ffffff;
  --mist:#f5f2ff;
  --line:#e7e1fb;
  --soft:#5c5372;
  --r:28px;
  --shadow:0 26px 60px -30px rgba(101,20,255,.5);
  --topH:3.6rem;
}

*,*::before,*::after{box-sizing:border-box}
html{background:#fff;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:Inter,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.7;
  color:var(--ink);
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:-25%;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(circle at 18% 12%,rgba(191,0,255,.13),transparent 42%),
    radial-gradient(circle at 82% 4%,rgba(101,20,255,.15),transparent 38%),
    radial-gradient(circle at 60% 92%,rgba(191,0,255,.1),transparent 40%),
    repeating-linear-gradient(135deg,rgba(28,23,38,.04) 0 2px,transparent 2px 28px);
  animation:drift 26s linear infinite;
}
@keyframes drift{to{transform:translate3d(-28px,-28px,0)}}

h1,h2,h3,h4{
  font-family:Calistoga,Inter,"PingFang SC",serif;
  line-height:1.16;
  margin:0 0 .55em;
  font-weight:400;
  letter-spacing:.005em;
}
p{margin:0 0 1.05em}
a{color:var(--purple)}
img{max-width:100%;height:auto;display:block;border-radius:18px}

.skip{
  position:absolute;left:.6rem;top:-3rem;z-index:100;
  background:var(--ink);color:#fff;padding:.6rem 1rem;border-radius:12px;
  text-decoration:none;transition:top .2s ease;
}
.skip:focus{top:.6rem}

/* ── 顶部口号细条 ── */
.strip{
  display:flex;align-items:center;justify-content:center;gap:.55rem;
  padding:.45rem .9rem;
  font-size:16px;letter-spacing:.02em;
  color:#fff;
  background:linear-gradient(100deg,var(--purple),var(--magenta));
}
.strip .dot{width:9px;height:9px;border-radius:50%;background:#fff;box-shadow:0 0 0 4px rgba(255,255,255,.28)}

/* ── 页头 ── */
.top{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.78);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.top-in{max-width:1180px;margin:0 auto;padding:.5rem clamp(1rem,4vw,2rem);display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand{display:flex;align-items:center;gap:.55rem;text-decoration:none;color:var(--ink);min-height:44px}
.brand-mark{
  display:grid;place-items:center;width:34px;height:34px;border-radius:12px;
  background:linear-gradient(135deg,var(--purple),var(--magenta));
  color:#fff;font-weight:600;font-size:17px;letter-spacing:.02em;
  box-shadow:0 8px 18px -8px rgba(101,20,255,.85);
}
.brand-word{font-size:16px;font-weight:600;letter-spacing:.04em}
.burger{
  display:flex;align-items:center;gap:.5rem;
  min-height:44px;padding:.4rem .9rem;
  font:inherit;font-size:16px;color:var(--ink);
  background:#fff;border:1px solid var(--line);border-radius:999px;cursor:pointer;
  transition:background .22s ease,color .22s ease,border-color .22s ease;
}
.burger:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.burger-bar{width:16px;height:2px;background:currentColor;box-shadow:0 5px 0 currentColor,0 -5px 0 currentColor}
.burger-txt{letter-spacing:.06em}

/* ── 粘性锚点条 ── */
.anchor-bar{position:sticky;top:var(--topH);z-index:65;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.anchor-in{
  max-width:1180px;margin:0 auto;
  padding:.35rem clamp(.8rem,3vw,1.6rem);
  display:flex;gap:.4rem;overflow-x:auto;scrollbar-width:none;
}
.anchor-in::-webkit-scrollbar{display:none}
.chip{
  flex:0 0 auto;display:flex;align-items:center;
  min-height:40px;padding:.2rem .85rem;
  font-size:16px;text-decoration:none;color:var(--soft);
  border:1px solid var(--line);border-radius:999px;background:#fff;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.chip:hover,.chip:focus{background:var(--purple);color:#fff;border-color:var(--purple)}

/* ── 全屏遮罩菜单 ── */
.menu{
  position:fixed;inset:0;z-index:70;
  background:
    radial-gradient(circle at 85% 10%,rgba(191,0,255,.55),transparent 52%),
    radial-gradient(circle at 10% 90%,rgba(101,20,255,.5),transparent 48%),
    var(--ink);
  color:#fff;
  opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .24s ease,transform .24s ease,visibility .24s;
  overflow-y:auto;
}
.menu.is-open{opacity:1;visibility:visible;transform:none}
body.menu-open{overflow:hidden}
.menu-in{max-width:1180px;margin:0 auto;padding:calc(var(--topH) + 2.2rem) clamp(1rem,5vw,2.5rem) 3rem}
.menu-kicker{margin:0 0 1rem;font-size:16px;letter-spacing:.22em;color:rgba(255,255,255,.66)}
.menu ol{list-style:none;margin:0;padding:0;border-top:1px solid rgba(255,255,255,.22)}
.menu li{border-bottom:1px solid rgba(255,255,255,.22)}
.menu li a{
  display:flex;align-items:center;gap:.9rem;
  min-height:60px;padding:.55rem .2rem;
  color:#fff;text-decoration:none;
  font-family:Calistoga,Inter,"PingFang SC",serif;
  font-size:clamp(1.2rem,3.4vw,1.6rem);
  transition:padding-left .22s ease,color .22s ease;
}
.menu li a:hover,.menu li a:focus{padding-left:.9rem;color:#e9dcff}
.menu li .idx{width:10px;height:10px;flex:0 0 auto;border-radius:3px;background:var(--magenta);transform:rotate(45deg)}
.menu li:nth-child(even) .idx{background:#fff}
.menu-foot{margin:1.6rem 0 0;font-size:16px;color:rgba(255,255,255,.6)}

/* ── 主体网格 ── */
.wrap{
  max-width:1180px;margin:0 auto;
  padding:0 clamp(1rem,4vw,2rem);
  display:grid;gap:clamp(2rem,5vw,3.4rem);
  grid-template-columns:minmax(0,1fr);
}

article[id]{scroll-margin-top:calc(var(--topH) + 3.6rem)}

/* ── 首屏 ── */
.hero{position:relative;grid-column:1 / -1;min-height:45vh;display:flex;align-items:center;padding:2rem 0 3.4rem;overflow:hidden}
.shard{position:absolute;pointer-events:none;border-radius:36px;will-change:transform}
.shard-a{
  top:-3.5rem;right:-4rem;width:min(46vw,340px);height:min(46vw,340px);
  background:linear-gradient(140deg,var(--purple),var(--magenta));
  transform:rotate(-14deg);opacity:.92;
}
.shard-b{
  bottom:-4.5rem;left:-3.5rem;width:min(30vw,190px);height:min(30vw,190px);
  background:repeating-linear-gradient(45deg,rgba(101,20,255,.9) 0 12px,rgba(191,0,255,.35) 12px 24px);
  transform:rotate(16deg);opacity:.55;
}
.hero-copy{position:relative;z-index:2;max-width:44rem;padding:clamp(1.2rem,3.4vw,2.2rem);border-radius:var(--r)}
.glass{
  background:rgba(255,255,255,.68);
  border:1px solid rgba(255,255,255,.85);
  backdrop-filter:blur(16px);
  box-shadow:var(--shadow);
}
.eyebrow{
  margin:0 0 .7rem;font-size:16px;letter-spacing:.16em;
  color:var(--magenta);font-weight:600;
}
.hero h1{
  font-size:clamp(2.15rem,6.4vw,4rem);
  margin:0 0 .5em;
  background:linear-gradient(100deg,var(--ink) 30%,var(--purple) 75%,var(--magenta));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  text-wrap:balance;
}
.lede{margin:0 0 1.3rem;font-size:17px;color:#3c3352;max-width:36rem}
.hero-actions{display:flex;flex-wrap:wrap;gap:.7rem}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:.55rem 1.25rem;
  font-size:16px;font-weight:600;letter-spacing:.03em;
  text-decoration:none;border-radius:999px;
  background:var(--purple);color:#fff;border:2px solid var(--purple);
  transition:background .22s ease,color .22s ease,transform .22s ease,border-color .22s ease;
}
.btn:hover,.btn:focus{background:var(--magenta);border-color:var(--magenta);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn-ghost:hover,.btn-ghost:focus{background:var(--ink);color:#fff;border-color:var(--ink)}
.btn-light{background:#fff;color:var(--purple);border-color:#fff}
.btn-light:hover,.btn-light:focus{background:var(--ink);color:#fff;border-color:var(--ink)}
.hero-slant{
  position:absolute;left:0;right:0;bottom:0;height:14px;
  background:linear-gradient(100deg,var(--purple) 0 50%,var(--magenta) 50% 100%);
  clip-path:polygon(0 100%,0 40%,100% 0,100% 100%);
}

/* ── 正文 ── */
.body-block{grid-column:1;min-width:0}
.prose{max-width:44rem}
.prose > article{padding:2rem 0 .4rem;border-top:1px solid var(--line)}
.prose > article:first-child{border-top:0;padding-top:.2rem}
.prose h2{
  position:relative;padding-left:1rem;
  font-size:clamp(1.5rem,3.6vw,2.05rem);
  margin-top:.2em;
}
.prose h2 > span{display:inline-block}
.prose h2::before{
  content:"";position:absolute;left:0;top:.28em;bottom:.28em;width:6px;border-radius:4px;
  background:linear-gradient(180deg,var(--purple),var(--magenta));
}
.prose h3{font-size:clamp(1.2rem,2.6vw,1.4rem);margin-top:1.6em;color:#2c2440}
.prose h3 > span{display:inline-block}
.prose p{color:#302944}
.prose ul,.prose ol{padding-left:1.25rem;margin:0 0 1.1em}
.prose li{margin-bottom:.5em}
.prose li::marker{color:var(--magenta)}
.prose strong{color:var(--ink);font-weight:600}
.prose a{color:var(--purple);text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
.prose a:hover{color:var(--magenta)}
.prose blockquote{
  margin:0 0 1.2em;padding:1rem 1.2rem;
  border-left:5px solid var(--magenta);border-radius:0 20px 20px 0;
  background:var(--mist);color:#3b3252;
}
.prose blockquote p:last-child{margin:0}
.prose table{width:100%;border-collapse:collapse;margin:0 0 1.2em;font-size:16px}
.prose th,.prose td{border:1px solid var(--line);padding:.55rem .7rem;text-align:left}
.prose th{background:var(--mist)}
.prose img{margin:0 0 1.2em}

/* ── 右栏 ── */
.rail{
  grid-column:1;min-width:0;
  border-radius:var(--r);padding:1.2rem 1.2rem 1.4rem;
  align-self:start;
}
.rail-t{font-size:1.05rem;letter-spacing:.1em;margin:0 0 .7rem;color:var(--ink)}
.rail-t > span{display:inline-block;border-bottom:3px solid var(--magenta);padding-bottom:.15rem}
.rail-t2{font-size:.98rem;letter-spacing:.08em;margin:1.5rem 0 .4rem;color:var(--soft)}
.rail-t2 > span{display:inline-block}
.rail-list{list-style:none;margin:0;padding:0}
.rail-list a{
  display:flex;align-items:center;min-height:42px;
  font-size:16px;text-decoration:none;color:#3b3252;
  border-bottom:1px dashed rgba(101,20,255,.22);
  transition:color .2s ease,padding-left .2s ease;
}
.rail-list a:hover,.rail-list a:focus{color:var(--magenta);padding-left:.35rem}
.rail-note{font-size:16px;color:var(--soft);margin:0}
.rot{display:grid;margin:1.1rem 0 0;min-height:5rem;font-size:16px;color:#413759}
.rot span{
  grid-area:1/1;
  padding:.65rem .8rem;border-radius:16px;
  background:rgba(101,20,255,.09);
  opacity:0;animation:rot 12s ease-in-out infinite;
}
@keyframes rot{
  0%{opacity:0;transform:translateY(6px)}
  6%{opacity:1;transform:none}
  30%{opacity:1;transform:none}
  36%{opacity:0;transform:translateY(-6px)}
  100%{opacity:0}
}

/* ── 页脚 ── */
footer{margin-top:clamp(3rem,7vw,5rem);border-top:3px solid var(--ink);background:rgba(255,255,255,.9)}
.cta{background:linear-gradient(112deg,var(--purple),var(--magenta));color:#fff}
.cta-in{
  max-width:1180px;margin:0 auto;padding:clamp(2.2rem,6vw,3.6rem) clamp(1rem,4vw,2rem);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1.1rem 2rem;
}
.cta h2{font-size:clamp(1.55rem,4vw,2.3rem);margin:0;color:#fff}
.cta p{margin:0;max-width:30ch;color:rgba(255,255,255,.9)}
.foot-cols{
  max-width:1180px;margin:0 auto;padding:2.2rem clamp(1rem,4vw,2rem);
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.6rem 1.2rem;
}
footer dl{margin:0;min-width:0}
footer dt{font-size:16px;font-weight:600;letter-spacing:.1em;color:var(--ink);margin-bottom:.15rem}
footer dd{margin:0;min-width:0}
footer dd a{
  display:flex;align-items:center;min-height:44px;
  font-size:16px;color:var(--soft);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
footer dd a:hover,footer dd a:focus{color:var(--magenta);border-color:currentColor}
.foot-base{border-top:1px solid var(--line);padding:1.1rem clamp(1rem,4vw,2rem);text-align:center}
.foot-base p{margin:0;font-size:16px;color:var(--soft)}

/* ── 桌面 ── */
@media (min-width:1000px){
  :root{--topH:3.9rem}
  .wrap{grid-template-columns:minmax(0,1fr) 19rem;gap:clamp(2.4rem,4vw,3.6rem)}
  .hero{grid-column:1 / -1}
  .body-block{grid-column:1;grid-row:2}
  .rail{grid-column:2;grid-row:2;position:sticky;top:calc(var(--topH) + 3.6rem)}
  .hero h1{max-width:34ch}
}

/* ── 窄屏微调 ── */
@media (max-width:479px){
  body{font-size:16px}
  .hero{padding:1.2rem 0 2.6rem;min-height:44vh}
  .shard-a{top:-2.2rem;right:-3.2rem;opacity:.8}
  .shard-b{bottom:-3rem;left:-3rem}
  .hero-copy{padding:1.1rem;border-radius:22px}
  .foot-cols{grid-template-columns:repeat(3,minmax(0,1fr));gap:.5rem .7rem}
  .brand-word{display:none}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  body::before{animation:none}
  .rot span{animation:none;opacity:1;grid-area:auto}
  .rot{grid-auto-rows:auto;gap:.4rem}
  .btn:hover,.btn:focus{transform:none}
}

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