@charset "utf-8";

:root{
  --ink:#172617;
  --deep:#0a130e;
  --neon:#69ff69;
  --cyan:#00ffff;
  --r:28px;
  --rail:92px;
  --line:rgba(105,255,105,.24);
  --text:#d9f0de;
  --dim:#8fb79c;
  --chrome:linear-gradient(135deg,#f2fff2 0%,#69ff69 26%,#00ffff 52%,#a9e6b4 74%,#ffffff 100%);
  --glass:linear-gradient(160deg,rgba(105,255,105,.10),rgba(0,255,255,.06) 58%,rgba(255,255,255,.03));
  --font:"Didact Gothic","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --deco:"Poiret One","Didact Gothic","PingFang SC",system-ui,sans-serif;
}

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

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

body{
  margin:0;
  min-height:100vh;
  font:400 17px/1.75 var(--font);
  color:var(--text);
  overflow-x:hidden;
  background:
    radial-gradient(820px 560px at 88% -8%, rgba(0,255,255,.16), transparent 62%),
    radial-gradient(640px 520px at -6% 34%, rgba(105,255,105,.15), transparent 66%),
    radial-gradient(900px 700px at 62% 108%, rgba(0,255,255,.09), transparent 70%),
    var(--deep);
  background-attachment:fixed,fixed,fixed,fixed;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(105,255,105,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,255,255,.045) 1px, transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(circle at 50% 24%, #000 8%, transparent 78%);
  mask-image:radial-gradient(circle at 50% 24%, #000 8%, transparent 78%);
}

/* 左侧竖排导航轨道 */
.rail{
  position:fixed;
  left:0;
  top:0;
  bottom:0;
  width:var(--rail);
  z-index:30;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:20px;
  padding:18px 0 22px;
  background:linear-gradient(180deg, rgba(23,38,23,.92), rgba(10,19,14,.78));
  border-right:1px solid var(--line);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
  box-shadow:14px 0 44px -32px rgba(0,255,255,.95);
}

.mark{
  flex:0 0 auto;
  width:42px;
  height:42px;
  display:grid;
  place-items:center;
  border-radius:16px;
  color:var(--ink);
  background:var(--chrome);
  box-shadow:0 0 22px rgba(105,255,105,.55), inset 0 0 12px rgba(255,255,255,.6);
  transition:transform .25s ease, box-shadow .25s ease;
}
.mark:hover{ transform:rotate(-8deg) scale(1.06); box-shadow:0 0 30px rgba(0,255,255,.85) }
.mark svg{ display:block }

.rail nav{ width:100%; display:flex; justify-content:center }
.rail nav p{
  display:flex;
  flex-direction:column;
  align-items:stretch;
  gap:2px;
  width:100%;
  margin:0;
  padding:0 8px;
}
.rail nav a{
  display:block;
  padding:11px 4px;
  text-align:center;
  font-size:16px;
  line-height:1.5;
  letter-spacing:.02em;
  color:#cfe9d6;
  text-decoration:none;
  border-radius:14px;
  transition:color .2s ease, background .2s ease, box-shadow .2s ease;
}
.rail nav a:hover,
.rail nav a.is-on{
  color:var(--ink);
  background:linear-gradient(135deg,var(--neon),var(--cyan));
  box-shadow:0 0 18px rgba(105,255,105,.6);
}

.cta{
  margin-top:auto;
  width:74px;
  padding:12px 0;
  text-align:center;
  white-space:nowrap;
  font-size:16px;
  font-weight:700;
  line-height:1.4;
  text-decoration:none;
  color:#04120a;
  border-radius:24px;
  background:var(--chrome);
  box-shadow:0 0 24px rgba(105,255,105,.5), inset 0 1px 0 #fff;
  transition:transform .2s ease, box-shadow .2s ease;
}
.cta:hover{ transform:translateY(-2px); box-shadow:0 0 32px rgba(0,255,255,.8) }

main{ position:relative; z-index:1; margin-left:var(--rail) }
.wrap{ max-width:1120px; margin:0 auto; padding:26px 30px 0 }

/* 首屏 */
.hero{
  position:relative;
  display:grid;
  grid-template-columns:1.06fr .94fr;
  gap:34px;
  align-items:center;
  min-height:45vh;
  padding:24px 0 44px;
  overflow:hidden;
}

.hero-copy{ position:relative; z-index:1 }

.deco{
  position:absolute;
  left:-6px;
  top:-22px;
  z-index:-1;
  font-family:var(--deco);
  font-size:clamp(96px,17vw,220px);
  line-height:.82;
  letter-spacing:-.02em;
  white-space:nowrap;
  color:transparent;
  -webkit-text-stroke:2px rgba(105,255,105,.17);
  pointer-events:none;
  user-select:none;
}

h1{
  position:relative;
  margin:0 0 14px;
  font-family:var(--deco);
  font-weight:400;
  font-size:clamp(30px,4.4vw,52px);
  line-height:1.18;
  letter-spacing:.01em;
  color:transparent;
  background:var(--chrome);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  filter:drop-shadow(0 0 20px rgba(105,255,105,.42));
}

.lede{
  margin:0;
  max-width:34em;
  font-size:17px;
  color:#b9dcc4;
}

.hero-art{
  position:relative;
  overflow:hidden;
  aspect-ratio:4/3;
  min-height:230px;
  border-radius:var(--r);
  border:1px solid rgba(0,255,255,.34);
  background:linear-gradient(135deg, rgba(0,255,255,.2), rgba(105,255,105,.12) 52%, rgba(255,255,255,.08));
  box-shadow:inset 0 0 70px rgba(0,255,255,.2), inset 0 1px 0 rgba(255,255,255,.4), 0 28px 70px -40px rgba(105,255,105,.95);
  will-change:transform;
}
.hero-art .hero-img{ display:block; width:100%; height:100%; object-fit:cover }

.bub{
  position:absolute;
  border-radius:50%;
  pointer-events:none;
  background:radial-gradient(circle at 32% 28%, #fff, rgba(0,255,255,.55) 42%, rgba(105,255,105,.12) 72%);
  filter:drop-shadow(0 0 12px rgba(0,255,255,.7));
}
.b1{ width:84px; height:84px; right:14px; bottom:16px; opacity:.85; animation:float 7s ease-in-out infinite }
.b2{ width:40px; height:40px; right:108px; bottom:80px; opacity:.7; animation:float 5.2s ease-in-out infinite reverse }

@keyframes float{
  0%,100%{ transform:translateY(0) }
  50%{ transform:translateY(-14px) }
}

/* 正文主区 */
.content{
  display:grid;
  grid-template-columns:minmax(0,1fr) 272px;
  gap:30px;
  align-items:start;
  padding-bottom:64px;
}

main section[id]{ scroll-margin-top:100px }

.prose > section{
  position:relative;
  margin:0 0 26px;
  padding:26px 26px 28px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.16), 0 24px 60px -42px rgba(0,255,255,.85);
  transition:transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.prose > section:hover{
  transform:translateY(-3px);
  border-color:rgba(0,255,255,.45);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.24), 0 30px 70px -40px rgba(105,255,105,.95);
}

.prose p{ margin:0 0 14px }
.prose h2{
  margin:0 0 12px;
  font-family:var(--deco);
  font-weight:400;
  font-size:clamp(21px,2.4vw,29px);
  line-height:1.3;
  letter-spacing:.01em;
  color:#effff1;
  text-shadow:0 0 24px rgba(105,255,105,.45);
}
.prose h2::after{
  content:"";
  display:block;
  width:58px;
  height:2px;
  margin-top:12px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--neon),var(--cyan));
}
.prose h3{
  margin:22px 0 8px;
  font-size:19px;
  color:#dffff0;
}
.prose a{
  color:var(--cyan);
  text-decoration:underline;
  text-decoration-color:rgba(0,255,255,.45);
  text-underline-offset:3px;
}
.prose a:hover{ color:var(--neon); text-decoration-color:var(--neon) }
.prose ul,.prose ol{ margin:0 0 16px; padding-left:1.3em }
.prose li{ margin-bottom:7px }
.prose li::marker{ color:var(--neon) }
.prose strong{ color:#effff1 }
.prose blockquote{
  margin:0 0 16px;
  padding:14px 18px;
  border-left:3px solid var(--cyan);
  border-radius:0 18px 18px 0;
  background:rgba(0,255,255,.07);
  color:#c6e8d1;
}
.prose blockquote p:last-child{ margin:0 }
.prose img{ display:block; max-width:100%; height:auto; margin:0 0 14px; border-radius:20px }
.prose small{
  display:block;
  margin-bottom:6px;
  font-size:14px;
  letter-spacing:.3em;
  color:var(--cyan);
}
.prose table{ width:100%; margin:0 0 16px; border-collapse:collapse; font-size:16px }
.prose th,.prose td{ padding:9px 10px; text-align:left; border-bottom:1px solid var(--line) }

/* 右侧目录 */
.side{
  position:sticky;
  top:24px;
  padding:22px 20px;
  border:1px solid rgba(0,255,255,.3);
  border-radius:var(--r);
  background:linear-gradient(160deg, rgba(0,255,255,.13), rgba(105,255,105,.07));
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.2), 0 20px 50px -38px rgba(0,255,255,1);
}
.side small{
  display:block;
  margin-bottom:4px;
  font-size:14px;
  letter-spacing:.34em;
  color:var(--cyan);
}
.side h2{
  margin:0 0 12px;
  font-family:var(--deco);
  font-weight:400;
  font-size:18px;
  letter-spacing:.02em;
  color:#eafff1;
}
.side ol{ margin:0; padding:0; list-style:none; counter-reset:s }
.side li{ counter-increment:s }
.side a{
  display:flex;
  gap:10px;
  align-items:baseline;
  padding:10px 0;
  font-size:16px;
  color:#d5f2dd;
  text-decoration:none;
  border-bottom:1px dashed rgba(105,255,105,.2);
  transition:color .2s ease, padding-left .2s ease;
}
.side a::before{
  content:counter(s,decimal-leading-zero);
  font-family:var(--deco);
  font-size:12px;
  color:var(--cyan);
}
.side a:hover{ color:var(--neon); padding-left:4px }
.side .top{ margin:14px 0 0 }
.side .top a{
  justify-content:center;
  padding:11px 0 2px;
  color:var(--cyan);
  border-bottom:0;
  font-size:16px;
}
.side .top a::before{ content:none }

/* 页脚 */
footer{
  position:relative;
  z-index:1;
  margin-left:var(--rail);
  padding:24px 30px 30px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  gap:14px 22px;
  align-items:center;
  justify-content:space-between;
  background:linear-gradient(180deg, rgba(10,19,14,.2), rgba(10,19,14,.72));
}
footer p{ display:flex; flex-wrap:wrap; gap:10px; align-items:center; margin:0 }
footer input{
  min-width:200px;
  padding:11px 16px;
  font:400 16px/1.5 var(--font);
  color:#eafff1;
  border:1px solid var(--line);
  border-radius:16px;
  background:rgba(255,255,255,.05);
  transition:border-color .2s ease, box-shadow .2s ease;
}
footer input::placeholder{ color:var(--dim) }
footer input:focus{
  outline:0;
  border-color:var(--cyan);
  box-shadow:0 0 0 3px rgba(0,255,255,.16);
}
footer button{
  padding:11px 22px;
  font:700 16px/1.5 var(--font);
  color:#04120a;
  cursor:pointer;
  border:0;
  border-radius:16px;
  background:var(--chrome);
  box-shadow:0 0 20px rgba(105,255,105,.45);
  transition:transform .2s ease, box-shadow .2s ease;
}
footer button:hover{ transform:translateY(-2px); box-shadow:0 0 28px rgba(0,255,255,.8) }
footer small{ font-size:14px; letter-spacing:.08em; color:var(--dim) }

@media (max-width:940px){
  body{ background-attachment:scroll }
  .rail{
    position:sticky;
    left:auto;
    right:auto;
    top:0;
    bottom:auto;
    width:auto;
    height:auto;
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:8px 12px;
    border-right:0;
    border-bottom:1px solid var(--line);
    background:rgba(10,19,14,.93);
    box-shadow:0 12px 34px -26px rgba(0,255,255,.95);
  }
  .rail nav{
    flex:1;
    min-width:0;
    justify-content:flex-start;
    overflow-x:auto;
    scrollbar-width:none;
    -webkit-overflow-scrolling:touch;
  }
  .rail nav::-webkit-scrollbar{ display:none }
  .rail nav p{
    flex-direction:row;
    gap:6px;
    width:auto;
    padding:0;
  }
  .rail nav a{ padding:11px 12px; white-space:nowrap }
  .cta{ margin-top:0; width:auto; padding:11px 16px; border-radius:18px }
  main,footer{ margin-left:0 }
  .wrap{ padding:18px 16px 0 }
  .hero{ grid-template-columns:1fr; min-height:0; gap:20px; padding:18px 0 32px }
  .deco{ font-size:clamp(72px,22vw,120px); top:-8px; left:-4px }
  .hero-art{ aspect-ratio:16/10; min-height:0 }
  .content{ grid-template-columns:1fr; gap:22px }
  .side{ position:static }
  .prose > section{ padding:22px 18px 24px; border-radius:24px }
  main section[id]{ scroll-margin-top:86px }
  footer{ padding:20px 16px 26px }
  footer input{ flex:1; min-width:0 }
}

@media (max-width:420px){
  h1{ font-size:30px }
  .lede{ font-size:16px }
  .b1{ width:64px; height:64px }
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto }
  .b1,.b2{ animation:none }
  *,*::before,*::after{
    transition-duration:.01ms !important;
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
  }
}

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