@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400&family=Source+Serif+4:ital,wght@0,300;0,400;0,600;1,300&display=swap');

:root{
  --mint:#69ff69;
  --cyan:#00ffff;
  --ink:#172617;
  --paper:#eaffea;
  --line:rgba(105,255,105,.24);
  --glass:rgba(105,255,105,.06);
  --chrome:linear-gradient(135deg,#e8feff 0%,#a7bcb2 16%,#ffffff 33%,#7e938a 50%,#e6fff2 68%,#8aa79a 84%,#ffffff 100%);
  --r:18px;
  --wrap:1180px;
  --fh:"Playfair Display","Source Serif 4",Georgia,"Songti SC",serif;
  --fb:"Source Serif 4",Georgia,"Songti SC","Songti TC",serif;
  --fm:"JetBrains Mono",ui-monospace,"SFMono-Regular",monospace;
}

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

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

body{
  margin:0;
  min-height:100vh;
  overflow-x:hidden;
  color:var(--paper);
  font-family:var(--fb);
  font-size:17px;
  line-height:1.75;
  background:
    radial-gradient(900px 620px at 88% -12%,rgba(0,255,255,.18),transparent 62%),
    radial-gradient(720px 520px at 8% 4%,rgba(105,255,105,.16),transparent 64%),
    linear-gradient(180deg,#0b1a10 0%,#172617 44%,#0e1f14 100%);
  background-color:#0b1a10;
}

a{color:var(--cyan)}

/* ---------- 顶栏 ---------- */
.top{
  position:sticky;
  top:0;
  z-index:40;
  display:flex;
  align-items:center;
  gap:12px;
  padding:8px clamp(12px,3vw,32px);
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(11,26,16,.94),rgba(11,26,16,.7));
  backdrop-filter:blur(14px) saturate(150%);
}

.brand{
  display:flex;
  align-items:center;
  gap:9px;
  flex:0 0 auto;
}

.spark{
  width:12px;
  height:12px;
  border-radius:50%;
  background:var(--chrome);
  box-shadow:0 0 12px rgba(105,255,105,.9),0 0 24px rgba(0,255,255,.5);
}

.logo{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  font-family:var(--fh);
  font-weight:900;
  font-size:20px;
  letter-spacing:.07em;
  color:#efffef;
  text-decoration:none;
  text-shadow:0 0 14px rgba(105,255,105,.6),0 0 30px rgba(0,255,255,.35);
}

.navwrap{margin-left:auto;min-width:0}

.menu ul{
  display:flex;
  flex-wrap:wrap;
  gap:4px;
  margin:0;
  padding:0;
  list-style:none;
}

.menu li{position:relative;flex:0 0 auto}

.menu a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 13px;
  border:1px solid transparent;
  border-radius:999px;
  color:#d9ffd9;
  font-size:16px;
  text-decoration:none;
  white-space:nowrap;
  transition:background .22s ease,color .22s ease,box-shadow .22s ease,border-color .22s ease;
}

.menu a:hover,
.menu a:focus-visible{
  color:#08150a;
  background:var(--chrome);
  border-color:rgba(255,255,255,.65);
  box-shadow:0 0 18px rgba(0,255,255,.45);
  outline:none;
}

.menu .grp > a::after{
  content:"▾";
  margin-left:7px;
  font-size:12px;
  opacity:.75;
}

.sub{
  position:absolute;
  top:calc(100% + 8px);
  left:0;
  z-index:5;
  display:flex;
  flex-direction:column;
  gap:2px;
  min-width:196px;
  margin:0;
  padding:8px;
  list-style:none;
  border:1px solid var(--line);
  border-radius:14px;
  background:rgba(10,25,15,.97);
  backdrop-filter:blur(10px);
  box-shadow:0 20px 44px rgba(0,0,0,.55),0 0 22px rgba(0,255,255,.16);
  opacity:0;
  visibility:hidden;
  transform:translateY(-6px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s;
}

.grp:hover .sub,
.grp:focus-within .sub{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

.sub a{min-height:42px;font-size:16px}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  display:grid;
  align-items:center;
  min-height:45vh;
  padding:clamp(26px,6vw,56px) clamp(16px,4vw,44px);
  overflow:hidden;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(560px 320px at 82% 14%,rgba(0,255,255,.24),transparent 70%),
    radial-gradient(460px 340px at 14% 92%,rgba(105,255,105,.22),transparent 72%),
    linear-gradient(118deg,#0a190f,#17321c 54%,#0c2116);
}

.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:
    radial-gradient(circle at 78% 76%,rgba(255,255,255,.5) 0 1.6px,transparent 2px),
    radial-gradient(circle at 22% 28%,rgba(0,255,255,.6) 0 1.8px,transparent 2.4px),
    radial-gradient(circle at 46% 88%,rgba(105,255,105,.5) 0 1.4px,transparent 2px);
  background-size:220px 200px,260px 240px,300px 260px;
  opacity:.7;
}

.hero-media{position:absolute;inset:0;z-index:0}

.hero-img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(118%) contrast(106%);
}

.veil{
  position:absolute;
  inset:0;
  background:
    linear-gradient(90deg,rgba(8,20,12,.92) 0%,rgba(8,20,12,.56) 48%,rgba(0,255,255,.18) 100%),
    linear-gradient(0deg,rgba(8,20,12,.96),rgba(8,20,12,.1) 68%);
}

.hero-copy{
  position:relative;
  z-index:2;
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  text-align:right;
}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0 0 10px;
  font-family:var(--fm);
  font-size:13px;
  letter-spacing:.26em;
  color:var(--cyan);
  text-shadow:0 0 12px rgba(0,255,255,.6);
}

.kicker b{color:var(--mint);font-size:13px}

.hero h1{
  margin:0;
  font-family:var(--fh);
  font-weight:900;
  font-size:clamp(27px,5.2vw,52px);
  line-height:1.16;
  letter-spacing:.01em;
  background:var(--chrome);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 18px rgba(105,255,105,.4));
}

.slash{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  z-index:3;
  height:12px;
  background:linear-gradient(90deg,var(--mint),var(--cyan) 58%,#ffffff);
  clip-path:polygon(0 62%,100% 0,100% 100%,0 100%);
  opacity:.92;
  animation:band 5s ease-in-out infinite;
}

@keyframes band{
  0%,100%{opacity:.62}
  50%{opacity:1}
}

/* ---------- 主体 ---------- */
.stage{
  display:grid;
  grid-template-columns:212px minmax(0,1fr);
  gap:clamp(16px,2.4vw,34px);
  align-items:start;
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(18px,3vw,38px) clamp(14px,3vw,28px) 44px;
}

.rail{
  position:sticky;
  top:74px;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:14px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:linear-gradient(180deg,rgba(105,255,105,.1),rgba(0,255,255,.05));
  backdrop-filter:blur(8px);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08);
}

.rail-h{
  margin:0;
  font-family:var(--fm);
  font-size:12px;
  font-weight:500;
  letter-spacing:.3em;
  color:var(--mint);
}

.rail-list{
  display:flex;
  flex-direction:column;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}

.rail-list a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:8px 10px;
  border:1px solid transparent;
  border-radius:10px;
  color:#d6ffdc;
  font-size:16px;
  text-decoration:none;
  transition:background .2s ease,border-color .2s ease,color .2s ease;
}

.rail-list a:hover,
.rail-list a:focus-visible{
  color:#ffffff;
  background:rgba(0,255,255,.15);
  border-color:rgba(0,255,255,.45);
  outline:none;
}

.rail-mark{
  margin:4px 0 0;
  font-family:var(--fh);
  font-size:15px;
  letter-spacing:.14em;
  color:rgba(234,255,234,.5);
}

.prose{min-width:0}

.prose > div{
  position:relative;
  margin:0 0 clamp(18px,3vw,30px);
  padding:clamp(18px,2.6vw,30px);
  border:1px solid var(--line);
  border-radius:var(--r);
  background:linear-gradient(158deg,rgba(105,255,105,.075),rgba(0,255,255,.045) 58%,rgba(255,255,255,.03));
  backdrop-filter:blur(6px);
  box-shadow:0 16px 42px rgba(0,0,0,.3),inset 0 1px 0 rgba(255,255,255,.07);
  scroll-margin-top:96px;
}

.prose > div::after{
  content:"✦";
  position:absolute;
  top:9px;
  right:14px;
  font-size:13px;
  line-height:1;
  color:rgba(0,255,255,.55);
  text-shadow:0 0 10px rgba(0,255,255,.7);
  pointer-events:none;
}

.prose h2{
  margin:0 0 14px;
  padding-bottom:10px;
  border-bottom:1px solid rgba(105,255,105,.28);
  font-family:var(--fh);
  font-weight:700;
  font-size:clamp(21px,3vw,29px);
  line-height:1.32;
}

.prose h2 span{
  background:var(--chrome);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 10px rgba(105,255,105,.3));
}

.prose h3{
  margin:20px 0 9px;
  font-family:var(--fh);
  font-weight:700;
  font-size:19px;
  line-height:1.4;
  color:var(--mint);
}

.prose p{margin:0 0 14px}
.prose p:last-child{margin-bottom:0}

.prose a{
  color:var(--cyan);
  text-underline-offset:3px;
  text-decoration-color:rgba(0,255,255,.5);
}

.prose strong{color:#ffffff}

.prose ul,
.prose ol{margin:0 0 14px;padding-left:1.3em}

.prose li{margin:0 0 7px}

.prose blockquote{
  margin:16px 0;
  padding:12px 16px;
  border-left:3px solid var(--mint);
  border-radius:0 12px 12px 0;
  background:rgba(105,255,105,.09);
}

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

.prose table{
  width:100%;
  border-collapse:collapse;
  font-size:16px;
}

.prose th,
.prose td{
  padding:8px 10px;
  border:1px solid var(--line);
  text-align:left;
}

/* ---------- 页脚 ---------- */
.base{
  margin-top:12px;
  padding:clamp(26px,5vw,52px) clamp(16px,4vw,40px) 26px;
  border-top:1px solid var(--line);
  text-align:center;
  background:linear-gradient(180deg,rgba(11,26,16,.45),rgba(8,20,12,.96));
}

.giant{
  margin:0;
  font-family:var(--fh);
  font-weight:900;
  font-size:clamp(46px,15vw,148px);
  line-height:.92;
  letter-spacing:.05em;
  background:var(--chrome);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  opacity:.88;
}

.base-h{
  margin:16px 0 10px;
  font-family:var(--fm);
  font-size:12px;
  font-weight:500;
  letter-spacing:.32em;
  color:var(--mint);
}

.dlrow{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:14px;
  max-width:780px;
  margin:0 auto;
  text-align:left;
}

.dlrow dl{
  margin:0;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:14px;
  background:rgba(105,255,105,.055);
}

.dlrow dt{
  margin-bottom:4px;
  font-family:var(--fm);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--cyan);
}

.dlrow dd{margin:0}

.dlrow a{
  display:flex;
  align-items:center;
  min-height:40px;
  color:#dbffdb;
  font-size:16px;
  text-decoration:none;
}

.dlrow a:hover,
.dlrow a:focus-visible{color:var(--mint);outline:none}

.copy{
  margin:20px 0 0;
  font-size:14px;
  letter-spacing:.08em;
  color:rgba(234,255,234,.62);
}

/* ---------- 滚动揭示 ---------- */
.rv{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .62s ease,transform .62s ease;
}

.rv.in{opacity:1;transform:none}

/* ---------- 移动端 ---------- */
@media (max-width:760px){
  body{font-size:16px}

  .navwrap{margin-left:auto;overflow:hidden}

  .menu ul{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
  .menu ul::-webkit-scrollbar{display:none}

  .menu a{min-height:44px;padding:0 11px;font-size:16px}

  .sub{display:none}

  .hero{min-height:auto;padding:26px 16px 34px}
  .hero-copy{text-align:left}

  .stage{grid-template-columns:minmax(0,1fr);gap:14px}
  .rail{position:static}
  .rail-list{flex-direction:row;flex-wrap:wrap;gap:6px}
  .rail-list a{
    padding:6px 12px;
    border-color:var(--line);
    border-radius:999px;
    background:rgba(0,255,255,.07);
    font-size:15px;
  }
  .rail-mark{display:none}

  .prose > div{padding:18px 16px;scroll-margin-top:78px}
  .prose > div::after{top:7px;right:11px}

  .dlrow{grid-template-columns:minmax(0,1fr);gap:10px}
  .dlrow dl{padding:8px 12px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  .slash{animation:none;opacity:.9}
}

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