:root{
  --violet:#6514ff;
  --magenta:#bf00ff;
  --ink:#1c1726;
  --paper:#f7f4ff;
  --muted:#544a6b;
  --radius:28px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"IBM Plex Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:radial-gradient(rgba(101,20,255,.14) 1px,transparent 1px);
  background-size:28px 28px;
}
img{max-width:100%;height:auto;display:block}
menu{margin:0;padding:0;list-style:none}
p{margin:0 0 1.05em}
a{color:var(--violet)}
:focus-visible{outline:3px solid var(--magenta);outline-offset:3px}

/* ============ 顶栏 ============ */
.masthead{
  position:sticky;top:0;z-index:60;
  background:rgba(28,23,38,.95);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:3px solid var(--magenta);
}
.masthead-in{
  position:relative;
  max-width:1200px;margin:0 auto;
  padding:11px 20px;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;gap:16px;
}
.menu-wrap{position:relative;justify-self:start}
.right-cluster{justify-self:end;display:flex;align-items:center;gap:10px}
.menu-key{
  display:none;list-style:none;cursor:pointer;
  align-items:center;justify-content:center;
  min-height:44px;min-width:64px;padding:0 16px;
  border:2px solid rgba(255,255,255,.3);border-radius:14px;
  color:#fff;font-size:16px;font-weight:600;line-height:1.5;
  transition:background .22s,border-color .22s;
}
.menu-key::-webkit-details-marker{display:none}
.menu-key:hover{background:var(--violet);border-color:var(--violet)}
.menu-wrap > menu.navlist{display:flex;align-items:center;gap:2px}
.navlist a{
  display:inline-flex;align-items:center;
  min-height:44px;padding:0 12px;border-radius:12px;
  color:#eae2ff;text-decoration:none;font-size:16px;font-weight:500;line-height:1.5;
  transition:background .22s,color .22s;
}
.navlist a:hover,.navlist a:focus-visible{background:var(--violet);color:#fff}
.brand-mark{
  justify-self:center;display:inline-flex;align-items:center;gap:10px;
  padding:4px 8px;min-height:44px;
  color:#fff;text-decoration:none;font-weight:700;font-size:20px;letter-spacing:.02em;
}
.brand-dot{
  width:14px;height:14px;border-radius:4px;background:var(--magenta);
  box-shadow:0 0 0 5px rgba(191,0,255,.26);
}
.cta{
  display:inline-flex;align-items:center;
  min-height:44px;padding:0 18px;border-radius:999px;
  background:var(--magenta);color:#fff;font-weight:600;font-size:16px;
  text-decoration:none;white-space:nowrap;
  transition:background .22s,transform .22s;
}
.cta:hover,.cta:focus-visible{background:var(--violet);transform:translateY(-2px)}

/* ============ 首屏 ============ */
.hero{
  position:relative;overflow:hidden;
  min-height:100vh;
  display:flex;flex-direction:column;justify-content:center;align-items:flex-end;
  gap:36px;padding:88px 24px 84px;
  text-align:right;
  background:linear-gradient(163deg,#1c1726 0%,#2a1c4d 46%,#6514ff 132%);
}
.hero::before{
  content:"";position:absolute;inset:-30% -12%;pointer-events:none;
  background-image:repeating-linear-gradient(115deg,rgba(191,0,255,.26) 0 2px,transparent 2px 46px);
  animation:drift 18s linear infinite;
}
.hero::after{
  content:"";position:absolute;right:-90px;top:7%;
  width:320px;height:320px;border-radius:72px;
  background:var(--magenta);opacity:.32;transform:rotate(16deg);pointer-events:none;
}
@keyframes drift{to{transform:translate3d(-46px,0,0)}}
.hero-top{
  position:relative;z-index:2;
  display:flex;flex-direction:column;align-items:flex-end;gap:20px;
  max-width:900px;
}
.hero-badge{
  margin:0;display:inline-flex;
  transform:rotate(-2.5deg);
  background:#fff;border-radius:14px;
  box-shadow:0 14px 28px -16px rgba(0,0,0,.85);
}
.hero-badge a{
  display:inline-flex;align-items:center;
  min-height:44px;padding:0 18px;
  color:var(--ink);text-decoration:none;font-weight:600;font-size:16px;
}
.hero h1{
  margin:0;color:#fff;
  font-size:clamp(32px,5.4vw,64px);
  line-height:1.2;letter-spacing:-.012em;font-weight:700;
  text-wrap:balance;
}
.hero-fig{
  position:relative;z-index:2;margin:0;
  width:100%;max-width:1120px;
  min-height:210px;aspect-ratio:16/8;
  border-radius:var(--radius);overflow:hidden;
  background:linear-gradient(120deg,var(--magenta),var(--violet));
  box-shadow:0 44px 90px -44px #000;
  flex:0 1 auto;
}
.hero-fig img{width:100%;height:100%;object-fit:cover}

/* ============ 正文区 ============ */
.content-shell{
  max-width:1200px;margin:0 auto;
  padding:88px 24px 96px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 296px;
  gap:56px;align-items:start;
}
.content-col{min-width:0;counter-reset:sec}
.content-col > section{
  position:relative;
  counter-increment:sec;
  background:#fff;
  border-left:8px solid var(--violet);
  border-radius:var(--radius);
  box-shadow:0 28px 62px -44px rgba(28,23,38,.95);
  padding:38px 34px 42px;
  margin-bottom:56px;
  scroll-margin-top:96px;
}
.content-col > section:nth-of-type(even){border-left-color:var(--magenta)}
.content-col > section::before{
  content:counter(sec,decimal-leading-zero);
  display:block;margin-bottom:6px;
  font-size:16px;font-weight:700;letter-spacing:.2em;color:var(--magenta);
}
.content-col h2{
  font-size:clamp(24px,2.6vw,32px);
  line-height:1.3;letter-spacing:-.01em;
  margin:0 0 18px;
}
.content-col h2 > span{box-shadow:inset 0 -.34em 0 rgba(191,0,255,.24)}
.content-col h3{font-size:21px;line-height:1.45;margin:30px 0 12px}
.content-col p,.content-col li{color:#2b2340;line-height:1.85}
.content-col ul,.content-col ol{margin:0 0 1.1em;padding-left:1.3em}
.content-col li{margin-bottom:.5em}
.content-col a{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
.content-col a:hover{color:var(--magenta)}
.content-col blockquote{
  margin:26px 0;padding:20px 24px;
  border-left:6px solid var(--magenta);border-radius:20px;
  background:#f2ecff;color:#3a2f57;
}
.content-col blockquote p:last-child{margin-bottom:0}
.content-col figure{margin:26px 0;border-radius:20px;overflow:hidden}
.content-col figcaption{padding-top:8px;font-size:16px;color:var(--muted)}
.content-col img{border-radius:20px}

/* ============ 侧栏 ============ */
.side-rail{position:sticky;top:96px;display:grid;gap:22px}
.rail-block{margin:0;background:var(--ink);color:#fff;border-radius:var(--radius);padding:24px 20px}
.rail-block-alt{background:var(--violet)}
.rail-title{font-size:18px;line-height:1.45;margin:0 0 14px;color:#fff;letter-spacing:.02em}
.rail-title > span{border-bottom:3px solid var(--magenta);padding-bottom:2px}
.rail-list li + li{border-top:1px solid rgba(255,255,255,.16)}
.rail-list a{
  display:flex;align-items:center;
  min-height:44px;color:#e7defc;text-decoration:none;font-size:16px;line-height:1.5;
  transition:color .2s,padding-left .2s;
}
.rail-list a:hover,.rail-list a:focus-visible{color:#fff;padding-left:6px}
.rail-desc{margin:0;font-size:16px;line-height:1.75;color:#efe8ff}

/* ============ 页脚 ============ */
.site-foot{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:18px;
  padding:48px max(24px,calc((100% - 1152px) / 2)) 40px;
  background:var(--ink);color:#cfc6e6;
  border-top:8px solid var(--magenta);
}
.foot-brand{margin:0;font-size:19px;font-weight:700;color:#fff}
.foot-link{margin:0}
.foot-link a{
  display:inline-flex;align-items:center;min-height:44px;
  color:#cbb9ff;text-decoration:none;font-size:16px;
  border-bottom:2px solid transparent;transition:color .2s,border-color .2s;
}
.foot-link a:hover{color:#fff;border-color:var(--magenta)}
.foot-legal{
  grid-column:1 / -1;margin:8px 0 0;padding-top:18px;
  text-align:center;color:#9a90b8;
  border-top:1px solid rgba(255,255,255,.14);
}
.foot-legal small{font-size:16px}

/* ============ 滚动出现 ============ */
.reveal-on .reveal{opacity:0;transform:translateY(20px);transition:opacity .55s ease,transform .55s ease}
.reveal-on .reveal.in{opacity:1;transform:none}

/* ============ 窄屏 ============ */
@media (max-width:1024px){
  .content-shell{grid-template-columns:minmax(0,1fr) 258px;gap:34px}
}
@media (max-width:900px){
  .masthead-in{display:flex;flex-wrap:wrap;gap:10px;padding:10px 16px}
  .brand-mark{order:1;flex:1 1 100%;justify-content:center;font-size:19px}
  .menu-wrap{order:2}
  .right-cluster{order:3;margin-left:auto}
  .menu-key{display:inline-flex}
  .menu-wrap > menu.navlist{
    display:none;
    position:absolute;top:calc(100% + 10px);left:0;z-index:70;
    min-width:210px;padding:8px;
    flex-direction:column;gap:2px;
    background:var(--ink);border:2px solid var(--magenta);border-radius:18px;
    box-shadow:0 26px 52px -22px rgba(0,0,0,.8);
  }
  .right-cluster .menu-wrap > menu.navlist{left:auto;right:0}
  .menu-wrap[open] > menu.navlist{display:flex}
  .navlist a{width:100%;justify-content:flex-start;color:#f1eaff}
  .hero{padding:64px 20px 64px;gap:26px}
  .hero h1{font-size:clamp(30px,8.4vw,46px)}
  .hero-fig{aspect-ratio:4/3;min-height:170px}
  .hero::after{width:220px;height:220px;right:-70px;top:4%}
  .content-shell{grid-template-columns:1fr;padding:56px 20px 68px;gap:40px}
  .content-col > section{padding:28px 20px 32px;margin-bottom:36px}
  .side-rail{position:static}
  .site-foot{grid-template-columns:1fr;text-align:center;padding:40px 20px 32px;gap:6px}
  .foot-link a{justify-content:center}
}
@media (max-width:480px){
  .content-col > section{border-left-width:6px;border-radius:22px}
  .hero-badge{transform:rotate(-1.6deg)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .hero::before{animation:none}
  .reveal-on .reveal{opacity:1;transform:none;transition:none}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}

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