:root{
  --ink:#1c1726;
  --violet:#6514ff;
  --pink:#bf00ff;
  --paper:#f3edff;
  --white:#ffffff;
  --radius:28px;
  --pad:clamp(16px,4vw,40px);
}
*,*::before,*::after{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  background:var(--paper);
}
body{
  margin:0;
  font-family:Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background:var(--paper);
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:-25%;
  z-index:0;
  pointer-events:none;
  background:
    repeating-linear-gradient(45deg,rgba(101,20,255,.10) 0 2px,transparent 2px 28px),
    repeating-linear-gradient(-45deg,rgba(191,0,255,.09) 0 2px,transparent 2px 38px);
  animation:drift 30s linear infinite;
}
@keyframes drift{
  from{transform:translate3d(0,0,0)}
  to{transform:translate3d(-90px,-90px,0)}
}
.masthead,.strip,main,footer{position:relative;z-index:1}

h1,h2,h3,h4,.brand-name,.foot-brand,.menu-list a{
  font-family:Newsreader,Georgia,"Songti SC","SimSun",serif;
  line-height:1.15;
  letter-spacing:.01em;
}
h1{font-size:clamp(2rem,7.5vw,4.2rem);font-weight:700;margin:0}
h2{font-size:clamp(1.5rem,3.4vw,2.1rem);font-weight:600;margin:0 0 .5em}
h3{font-size:clamp(1.2rem,2.4vw,1.5rem);font-weight:600;margin:1.5em 0 .4em}
p{margin:0 0 1em}
a{color:#4a08c8}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--pink);outline-offset:3px}

hr{
  border:0;
  height:6px;
  margin:14px 0 22px;
  border-radius:99px;
  background:linear-gradient(90deg,var(--violet),var(--pink) 70%,#ff5bd0);
}

.skip{
  position:absolute;
  left:-9999px;
  top:0;
  padding:12px 18px;
  background:var(--ink);
  color:#fff;
  z-index:9;
  border-radius:0 0 16px 0;
}
.skip:focus{left:0}

/* 页头 */
.masthead{
  background:var(--ink);
  color:#fff;
  padding:16px 128px 16px var(--pad);
  border-bottom:4px solid var(--violet);
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  width:100%;
  min-height:48px;
  color:#fff;
  text-decoration:none;
}
.brand img{width:40px;height:40px;border-radius:12px;display:block}
.brand-mark{
  width:40px;height:40px;
  border-radius:12px;
  background:linear-gradient(135deg,var(--violet),var(--pink));
  border:2px solid rgba(255,255,255,.6);
  flex:0 0 auto;
  transform:rotate(-6deg);
}
.brand-name{font-size:clamp(1.15rem,4.4vw,1.6rem);font-weight:600}

.burger{
  position:fixed;
  top:18px;
  right:clamp(12px,3vw,28px);
  z-index:7;
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:0 16px;
  font:inherit;
  font-size:.95rem;
  color:#fff;
  background:var(--violet);
  border:2px solid rgba(255,255,255,.55);
  border-radius:999px;
  cursor:pointer;
  transition:background .2s ease,color .2s ease;
}
.burger:hover{background:var(--pink)}
.burger-bar,.burger-bar::before,.burger-bar::after{
  display:block;
  width:18px;height:2px;
  background:currentColor;
  border-radius:2px;
}
.burger-bar{position:relative}
.burger-bar::before,.burger-bar::after{content:"";position:absolute;left:0}
.burger-bar::before{top:-6px}
.burger-bar::after{top:6px}

/* 锚点条 */
.strip{
  position:sticky;
  top:0;
  z-index:4;
  background:var(--violet);
  border-bottom:3px solid var(--ink);
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
}
.strip-list{
  display:flex;
  gap:2px;
  list-style:none;
  margin:0;
  padding:0 clamp(6px,2vw,18px);
}
.strip-list a{
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:0 14px;
  color:#fff;
  text-decoration:none;
  font-size:.92rem;
  white-space:nowrap;
  border-bottom:3px solid transparent;
  transition:background .2s ease;
}
.strip-list a:hover{background:rgba(28,23,38,.42);border-bottom-color:#fff}

/* 全屏菜单 */
.menu-panel{
  position:fixed;
  inset:0;
  z-index:5;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:88px 20px 40px;
  overflow:auto;
  color:#fff;
  background:linear-gradient(155deg,var(--violet),var(--pink) 58%,var(--ink));
  transform:translateY(-103%);
  transition:transform .28s ease;
}
body.menu-open .menu-panel{transform:none}
.menu-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:12px;
  width:min(560px,100%);
  counter-reset:mi;
}
.menu-list li{counter-increment:mi}
.menu-list a{
  display:flex;
  align-items:center;
  gap:14px;
  min-height:54px;
  padding:8px 18px;
  color:#fff;
  text-decoration:none;
  font-size:clamp(1.15rem,4.4vw,1.6rem);
  border:2px solid rgba(255,255,255,.45);
  border-radius:18px;
  transition:background .2s ease,color .2s ease;
}
.menu-list a::before{
  content:counter(mi,decimal-leading-zero);
  font-family:Roboto,sans-serif;
  font-size:.78rem;
  letter-spacing:.16em;
  opacity:.85;
}
.menu-list a:hover{background:#fff;color:var(--ink)}
body.menu-open{overflow:hidden}

/* 布局骨架 */
.wrap{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:22px clamp(0px,2.4vw,26px) 0;
}

/* Hero */
.hero{
  position:relative;
  overflow:hidden;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:30px;
  min-height:70vh;
  padding:clamp(46px,9vw,90px) clamp(18px,5vw,56px) clamp(80px,11vw,130px);
  text-align:center;
  color:#fff;
  border-radius:var(--radius);
  background:linear-gradient(138deg,var(--violet) 8%,var(--pink) 58%,#ff4fc8);
  clip-path:polygon(0 0,100% 0,100% 93%,0 100%);
}
.hero-band{
  position:absolute;
  left:-20%;
  right:-20%;
  top:38%;
  height:88px;
  background:rgba(28,23,38,.28);
  transform:rotate(-7deg);
  animation:band 11s ease-in-out infinite alternate;
}
@keyframes band{
  from{transform:rotate(-7deg) translateY(-14px)}
  to{transform:rotate(-5deg) translateY(22px)}
}
.hero-dot{position:absolute;border-radius:50%;background:rgba(255,255,255,.28)}
.hero-dot-a{width:150px;height:150px;top:-40px;left:-40px}
.hero-dot-b{width:90px;height:90px;bottom:14%;right:-24px;background:rgba(28,23,38,.3)}
.hero-copy{position:relative;z-index:2;max-width:820px}
.hero-desc{
  margin:18px auto 26px;
  font-size:clamp(1rem,2.5vw,1.16rem);
  line-height:1.7;
  max-width:620px;
  color:#f6ecff;
}
.hero-cta{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:0 30px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--ink);
  background:#fff;
  border:3px solid var(--ink);
  border-radius:999px;
  text-decoration:none;
  transition:background .22s ease,color .22s ease,transform .22s ease;
}
.hero-cta:hover{background:var(--ink);color:#fff;transform:translateY(-2px)}
.hero-figure{position:relative;z-index:2;width:100%;max-width:780px}
.hero-img{
  display:block;
  width:100%;
  height:auto;
  border:3px solid #fff;
  border-radius:var(--radius);
}

/* 两栏（aside 在左） */
.cols{
  display:grid;
  grid-template-columns:1fr;
  gap:32px;
  padding:clamp(28px,5vw,52px) 0 clamp(40px,6vw,64px);
}
.side{
  align-self:start;
  padding:20px;
  background:var(--white);
  border:2px solid var(--ink);
  border-radius:var(--radius);
}
.side h2{font-size:1.3rem;margin:0}
.side hr{margin:10px 0 16px}
.side-list{list-style:none;margin:0;padding:0;border-left:3px solid var(--violet)}
.side-list a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:6px 12px;
  font-size:.95rem;
  color:var(--ink);
  text-decoration:none;
  border-bottom:1px dashed rgba(28,23,38,.22);
  transition:background .2s ease,color .2s ease;
}
.side-list li:last-child a{border-bottom:0}
.side-list a:hover{background:var(--violet);color:#fff}

/* 正文 */
.content{min-width:0}
.content div{
  margin:0 0 30px;
  padding:clamp(20px,3.6vw,38px);
  background:var(--white);
  border:2px solid var(--ink);
  border-radius:var(--radius);
  scroll-margin-top:78px;
  animation:rise .5s both;
}
.content div:nth-child(even){
  background:var(--ink);
  color:#f0e8ff;
  border-color:var(--ink);
}
.content div:nth-child(even) h2,
.content div:nth-child(even) h3{color:#fff}
.content div:nth-child(even) a{color:#e8d9ff}
.content div:nth-child(even) hr{background:linear-gradient(90deg,#bf00ff,#6514ff)}
.content div:nth-child(1){animation-delay:.02s}
.content div:nth-child(2){animation-delay:.06s}
.content div:nth-child(3){animation-delay:.1s}
.content div:nth-child(4){animation-delay:.14s}
.content div:nth-child(5){animation-delay:.18s}
.content div:nth-child(6){animation-delay:.22s}
.content div:nth-child(7){animation-delay:.26s}
.content div:nth-child(n+8){animation-delay:.3s}
@keyframes rise{
  from{opacity:0;transform:translateY(18px)}
  to{opacity:1;transform:none}
}
.content a{
  color:#4a08c8;
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}
.content a:hover{background:rgba(191,0,255,.18)}
.content ul,.content ol{padding-left:1.35em}
.content li{margin:.35em 0}
.content blockquote{
  margin:1.2em 0;
  padding:.6em 0 .6em 1.1em;
  border-left:5px solid var(--pink);
  font-family:Newsreader,Georgia,serif;
  font-size:1.1em;
}
.content img{max-width:100%;height:auto;border-radius:20px;display:block}
.content code,.content pre{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:.94em;
}
.content pre{
  overflow-x:auto;
  padding:16px;
  background:#2a2340;
  color:#eee6ff;
  border-radius:18px;
}
.content table{width:100%;border-collapse:collapse;display:block;overflow-x:auto}
.content th,.content td{border:1px solid rgba(28,23,38,.25);padding:8px 12px;text-align:left}

/* 页脚 */
footer{
  margin-top:8px;
  background:var(--ink);
  color:#efe7ff;
  border-top:7px solid var(--pink);
}
.foot-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:16px 26px;
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:24px var(--pad) 30px;
}
.foot-brand{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  color:#fff;
  font-size:1.1rem;
  font-weight:600;
  text-decoration:none;
  border-bottom:3px solid var(--pink);
}
.foot-nav{flex:1 1 280px;min-width:0}
.foot-list{
  display:flex;
  flex-wrap:wrap;
  gap:2px 10px;
  list-style:none;
  margin:0;
  padding:0;
}
.foot-list a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 6px;
  font-size:.92rem;
  color:#cfc2ea;
  text-decoration:none;
}
.foot-list a:hover{color:var(--ink);background:#fff}
.sub{display:flex;gap:8px;flex:0 1 260px}
.sub-input{
  flex:1 1 auto;
  min-width:0;
  min-height:44px;
  padding:0 14px;
  font:inherit;
  font-size:1rem;
  color:#fff;
  background:rgba(255,255,255,.08);
  border:2px solid var(--violet);
  border-radius:999px;
}
.sub-input::placeholder{color:#b8a9d6}
.sub-btn{
  min-height:44px;
  padding:0 18px;
  font:inherit;
  font-size:.95rem;
  font-weight:600;
  color:var(--ink);
  background:#fff;
  border:2px solid var(--pink);
  border-radius:999px;
  cursor:pointer;
  transition:background .2s ease,color .2s ease;
}
.sub-btn:hover{background:var(--pink);color:#fff}
.copy{margin:0 auto;font-size:.88rem;color:#a294c4;text-align:center}

@media (min-width:700px){
  .copy{margin-left:auto;margin-right:0}
}
@media (min-width:960px){
  .cols{grid-template-columns:228px minmax(0,1fr);gap:48px;align-items:start}
  .side{position:sticky;top:82px}
  .content div{margin-bottom:40px}
}
@media (min-width:1100px){
  .hero{min-height:72vh}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  body::before,.hero-band,.content div{animation:none}
  .menu-panel,.burger,.hero-cta{transition:none}
}

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