@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@300;400;500;600;700&family=Noto+Sans:wght@300;400;500;600;700&display=swap');

:root{
  --neon:#69ff69;
  --cyan:#00ffff;
  --ink:#172617;
  --deep:#050e09;
  --panel:#0e1c14;
  --panel-2:#12251a;
  --line:rgba(105,255,105,.28);
  --line-2:rgba(0,255,255,.3);
  --chrome:linear-gradient(148deg,#f6fff9 0%,#a9c4b5 34%,#ffffff 50%,#79987f 66%,#e6fff1 100%);
  --r:10px;
  --pad:clamp(16px,4vw,40px);
}

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

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

body{
  margin:0;
  color:#e6fff0;
  font-family:'Be Vietnam Pro','Noto Sans',system-ui,-apple-system,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-size:16.5px;
  line-height:1.72;
  background:
    radial-gradient(64vw 42vw at 10% -10%,rgba(0,255,255,.17),transparent 62%),
    radial-gradient(58vw 38vw at 94% 2%,rgba(105,255,105,.15),transparent 60%),
    radial-gradient(80vw 60vw at 50% 120%,rgba(0,255,255,.08),transparent 70%),
    var(--deep);
  background-attachment:fixed;
  overflow-x:hidden;
}

img{max-width:100%;height:auto;display:block}
ol,ul{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
p{margin:0 0 1em}
h1,h2,h3{margin:0;line-height:1.25;letter-spacing:-.01em}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

.skip{
  position:absolute;left:8px;top:-64px;z-index:90;
  padding:12px 18px;border-radius:var(--r);
  background:var(--neon);color:var(--ink);font-weight:700;
  transition:top .2s ease;
}
.skip:focus{top:8px}

/* ---------- 顶部两行：品牌行 + 菜单行 ---------- */
.bar{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg,rgba(8,20,13,.96),rgba(8,20,13,.82));
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(0,255,255,.14),0 14px 30px -24px rgba(0,255,255,.8);
}
.bar::after{
  content:"";display:block;height:2px;
  background:linear-gradient(90deg,transparent,var(--neon),var(--cyan),transparent);
  opacity:.75;
}
.bar-top{
  display:flex;align-items:center;
  padding:10px var(--pad) 8px;
}
.brand{
  display:inline-flex;align-items:center;gap:11px;
  min-height:44px;padding:4px 14px 4px 6px;
  border-radius:999px;
  border:1px solid rgba(105,255,105,.4);
  background:linear-gradient(140deg,rgba(105,255,105,.14),rgba(0,255,255,.1));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.28),0 0 18px -6px rgba(105,255,105,.8);
}
.brand-logo{
  width:40px;height:40px;border-radius:50%;
  object-fit:cover;
  border:2px solid #eafff3;
  box-shadow:0 0 12px rgba(0,255,255,.65);
}
.brand-mark{
  display:grid;place-items:center;width:40px;height:40px;border-radius:50%;
  background:var(--chrome);color:var(--ink);font-weight:700;
}
.brand-name{
  font-weight:700;font-size:19px;letter-spacing:.04em;
  color:#f2fff7;
  text-shadow:0 0 10px rgba(105,255,105,.9),0 0 22px rgba(0,255,255,.5);
}
.bar-nav{padding:0 var(--pad) 8px}
.menu{display:flex;gap:8px;flex-wrap:wrap}
.m-link{
  display:inline-flex;align-items:center;gap:7px;
  min-height:42px;padding:9px 15px;
  font-size:16px;font-weight:600;color:#d4ffe4;
  border-radius:999px;
  border:1px solid rgba(0,255,255,.24);
  background:linear-gradient(150deg,rgba(255,255,255,.1),rgba(0,255,255,.06));
  cursor:pointer;
  transition:color .18s,box-shadow .22s,transform .18s,border-color .18s;
}
.m-link:hover,.m-link:focus-visible{
  color:var(--ink);
  border-color:transparent;
  background:var(--chrome);
  transform:translateY(-1px);
  box-shadow:0 6px 16px -8px rgba(0,255,255,.95);
}
.caret{
  width:8px;height:8px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;
  transform:rotate(45deg) translateY(-1px);
}
.drop{position:relative}
.drop-list{
  position:absolute;left:0;top:calc(100% + 8px);min-width:190px;
  padding:8px;border-radius:12px;
  background:linear-gradient(160deg,rgba(14,30,20,.99),rgba(8,18,13,.99));
  border:1px solid var(--line-2);
  box-shadow:0 18px 40px -20px rgba(0,255,255,.9);
  display:none;
}
.drop:hover .drop-list,
.drop:focus-within .drop-list,
.drop.open .drop-list{display:block}
.drop-list a{
  display:flex;align-items:center;min-height:42px;padding:9px 12px;
  border-radius:8px;font-size:16px;color:#d7ffe8;
}
.drop-list a:hover,.drop-list a:focus-visible{
  background:linear-gradient(150deg,rgba(105,255,105,.22),rgba(0,255,255,.18));
  color:#fff;
}

/* ---------- 主体 ---------- */
.wrap{max-width:1180px;margin:0 auto;padding:0 var(--pad) 72px}

.hero{
  position:relative;
  display:flex;flex-direction:column;justify-content:flex-start;gap:26px;
  min-height:calc(100svh - 116px);
  padding:clamp(26px,6vw,64px) 0 40px;
}
.hero-text{max-width:760px;text-align:left}
.badge{
  display:inline-block;margin-bottom:16px;
  padding:6px 15px;border-radius:999px;
  font-size:15px;font-weight:600;letter-spacing:.16em;color:#06210f;
  background:linear-gradient(120deg,var(--neon),var(--cyan));
  box-shadow:0 0 20px -4px rgba(105,255,105,.9);
}
.hero h1{
  font-size:clamp(30px,6.2vw,58px);
  font-weight:700;
  color:#f4fff9;
  text-shadow:0 0 16px rgba(0,255,255,.55),0 0 34px rgba(105,255,105,.4);
}
.hero-sub{
  margin-top:16px;max-width:60ch;
  font-size:clamp(16px,2vw,18px);color:#bdead0;
}
.neon-btn{
  display:inline-flex;align-items:center;justify-content:center;
  margin-top:24px;min-height:48px;padding:12px 30px;
  border-radius:999px;font-weight:700;font-size:17px;letter-spacing:.06em;
  color:#05220f;
  background:linear-gradient(150deg,#c8ffd8,var(--neon) 42%,var(--cyan));
  border:2px solid #effff6;
  box-shadow:0 0 0 4px rgba(105,255,105,.16),0 12px 28px -14px rgba(0,255,255,1);
  transition:transform .18s,box-shadow .22s;
}
.neon-btn:hover,.neon-btn:focus-visible{
  transform:translateY(-2px) scale(1.02);
  box-shadow:0 0 0 6px rgba(0,255,255,.22),0 16px 34px -12px rgba(105,255,105,1);
}

.hero-art{position:relative;flex:1;min-height:180px;display:flex;align-items:flex-end}
.art-frame{
  position:relative;width:100%;border-radius:18px;overflow:hidden;
  border:1px solid rgba(0,255,255,.4);
  background:linear-gradient(150deg,rgba(0,255,255,.14),rgba(105,255,105,.12));
  box-shadow:0 0 34px -18px rgba(0,255,255,1),inset 0 0 0 1px rgba(255,255,255,.1);
}
.hero-img{width:100%;aspect-ratio:16/9;object-fit:cover}
.art-empty{
  min-height:200px;
  background:
    radial-gradient(60% 80% at 30% 20%,rgba(0,255,255,.18),transparent 70%),
    radial-gradient(50% 70% at 78% 70%,rgba(105,255,105,.18),transparent 70%);
  border-radius:18px;
}
.bub{
  position:absolute;border-radius:50%;pointer-events:none;
  background:radial-gradient(circle at 32% 28%,#ffffff,rgba(0,255,255,.65) 42%,rgba(105,255,105,.25) 70%,transparent 74%);
  filter:drop-shadow(0 0 12px rgba(0,255,255,.8));
  animation:float 7s ease-in-out infinite;
}
.b1{width:64px;height:64px;right:8%;top:-16px}
.b2{width:34px;height:34px;right:22%;bottom:14%;animation-delay:-2.4s}
.b3{width:96px;height:96px;left:6%;bottom:8%;animation-delay:-4s}
.ring{
  position:absolute;inset:auto 12% 10% auto;width:130px;height:130px;border-radius:50%;
  border:1px dashed rgba(105,255,105,.5);
  animation:spin 18s linear infinite;
}
@keyframes float{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-12px)}
}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- 左栏 + 正文 ---------- */
.reader{
  display:grid;
  grid-template-columns:250px minmax(0,1fr);
  gap:clamp(18px,3vw,38px);
  align-items:start;
  padding-top:34px;
  border-top:1px solid rgba(0,255,255,.18);
}
.side{
  position:sticky;top:150px;
  padding:16px 14px;
  border-radius:14px;
  background:linear-gradient(165deg,rgba(18,37,26,.92),rgba(9,20,14,.94));
  border:1px solid var(--line);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.12),0 0 24px -16px rgba(0,255,255,.9);
}
.side-h{
  position:relative;
  font-size:16px;font-weight:700;letter-spacing:.2em;color:#a9ffcd;
  padding-bottom:10px;margin-bottom:8px;
  border-bottom:1px solid rgba(105,255,105,.32);
}
.side-h > span{position:relative;display:inline-block}
.spark{
  position:absolute;right:-14px;top:-2px;width:8px;height:8px;
  background:var(--cyan);border-radius:50%;
  box-shadow:0 0 10px var(--cyan),0 0 18px var(--neon);
  animation:float 3.6s ease-in-out infinite;
}
.toc li + li{margin-top:2px}
.toc a{
  display:flex;align-items:center;gap:10px;
  min-height:42px;padding:7px 9px;border-radius:8px;
  font-size:16px;color:#c6f4d8;
  border-left:2px solid transparent;
  transition:background .18s,border-color .18s,color .18s;
}
.toc a:hover,.toc a:focus-visible{
  color:#fff;border-left-color:var(--neon);
  background:linear-gradient(90deg,rgba(105,255,105,.18),transparent);
}
.toc-n{
  font-size:14px;font-weight:700;letter-spacing:.06em;color:var(--cyan);
  min-width:22px;
}

.prose{
  min-width:0;
  background:linear-gradient(170deg,rgba(15,29,21,.86),rgba(8,18,13,.9));
  border:1px solid rgba(105,255,105,.18);
  border-radius:var(--r);
  padding:clamp(18px,3.4vw,40px);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08),0 24px 60px -48px rgba(0,255,255,1);
}
.prose div{padding:26px 0;scroll-margin-top:150px}
.prose div + div{border-top:1px solid rgba(0,255,255,.14)}
.prose div:first-child{padding-top:4px}
.prose h2{
  position:relative;
  font-size:clamp(22px,3.4vw,30px);font-weight:700;color:#f0fff7;
  margin-bottom:14px;padding-bottom:12px;
  text-shadow:0 0 14px rgba(0,255,255,.4);
}
.prose h2::after{
  content:"";position:absolute;left:0;bottom:0;width:72px;height:3px;border-radius:3px;
  background:linear-gradient(90deg,var(--neon),var(--cyan));
  box-shadow:0 0 12px rgba(105,255,105,.9);
}
.prose h2 > span,.prose h3 > span{display:inline}
.prose h3{
  font-size:clamp(18px,2.5vw,21px);font-weight:600;color:#d6ffe7;
  margin:22px 0 10px;
}
.prose p{color:#cfeeda}
.prose a{
  color:var(--cyan);border-bottom:1px solid rgba(0,255,255,.45);
  transition:color .18s,border-color .18s;
}
.prose a:hover{color:var(--neon);border-color:var(--neon)}
.prose ul,.prose ol{margin:0 0 1em;padding-left:1.15em}
.prose ul li{list-style:none;position:relative;padding-left:18px;margin-bottom:8px;color:#cfeeda}
.prose ul li::before{
  content:"";position:absolute;left:0;top:.72em;width:7px;height:7px;
  background:var(--neon);border-radius:2px;transform:rotate(45deg);
  box-shadow:0 0 8px rgba(105,255,105,.9);
}
.prose ol{counter-reset:li}
.prose ol li{
  list-style:none;counter-increment:li;position:relative;
  padding-left:32px;margin-bottom:10px;color:#cfeeda;
}
.prose ol li::before{
  content:counter(li,decimal-leading-zero);
  position:absolute;left:0;top:0;
  font-size:14px;font-weight:700;color:var(--cyan);letter-spacing:.06em;
}
.prose strong{color:#fff;font-weight:700}
.prose blockquote{
  margin:0 0 1em;padding:14px 18px;
  border-left:3px solid var(--cyan);border-radius:0 10px 10px 0;
  background:linear-gradient(90deg,rgba(0,255,255,.12),transparent);
  color:#dcffee;
}
.prose img{border-radius:var(--r);border:1px solid var(--line-2)}
.prose table{width:100%;border-collapse:collapse;margin-bottom:1em;font-size:16px}
.prose th,.prose td{border:1px solid rgba(0,255,255,.22);padding:9px 11px;text-align:left}
.prose th{background:rgba(105,255,105,.14);color:#eafff3}
.prose code{
  font-family:ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  font-size:15px;padding:1px 6px;border-radius:6px;
  background:rgba(0,255,255,.14);color:#c8fff0;
}
.prose time{color:var(--neon);font-size:15px;letter-spacing:.04em}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:20px;
  padding:38px var(--pad) 22px;
  border-top:1px solid var(--line-2);
  background:
    radial-gradient(70vw 40vw at 20% 0%,rgba(0,255,255,.12),transparent 62%),
    linear-gradient(180deg,rgba(11,24,17,.96),rgba(5,13,9,1));
}
.foot-grid{
  display:grid;grid-template-columns:1.4fr 2fr;gap:clamp(20px,4vw,46px);
  max-width:1180px;margin:0 auto;
}
.foot-brand{
  margin:0 0 12px;font-weight:700;font-size:19px;letter-spacing:.04em;color:#f2fff7;
  text-shadow:0 0 12px rgba(105,255,105,.8);
}
.foot-h{
  font-size:15px;font-weight:600;letter-spacing:.2em;color:#9dffc4;
  margin-bottom:8px;
}
.foot-h > span{display:inline-block;padding-bottom:3px;border-bottom:1px solid rgba(105,255,105,.4)}
.sub{display:flex;gap:8px;flex-wrap:wrap}
.sub input{
  flex:1 1 150px;min-height:44px;padding:10px 14px;
  font:inherit;font-size:16px;color:#eafff3;
  border-radius:999px;border:1px solid rgba(0,255,255,.3);
  background:rgba(255,255,255,.06);
}
.sub input::placeholder{color:#8fbca4}
.sub input:focus-visible{outline:2px solid var(--neon);outline-offset:2px}
.sub button{
  min-height:44px;padding:10px 22px;font:inherit;font-size:16px;font-weight:700;
  border-radius:999px;border:1px solid #eafff3;cursor:pointer;color:#05220f;
  background:linear-gradient(150deg,#c8ffd8,var(--neon) 45%,var(--cyan));
  transition:transform .18s,box-shadow .2s;
}
.sub button:hover{transform:translateY(-1px);box-shadow:0 8px 20px -10px rgba(0,255,255,1)}
.foot-nav{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:14px 18px;
}
.foot-nav dl{padding-top:6px;border-top:1px solid rgba(105,255,105,.3)}
.foot-nav dt{margin:0}
.foot-nav dt a{
  display:flex;align-items:center;min-height:42px;padding:5px 0;
  font-size:16px;color:#cdf2dd;
  transition:color .18s,transform .18s;
}
.foot-nav dt a:hover,.foot-nav dt a:focus-visible{
  color:var(--neon);transform:translateX(3px);
  text-shadow:0 0 12px rgba(105,255,105,.9);
}
.foot-base{
  display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;
  max-width:1180px;margin:30px auto 0;padding-top:14px;
  border-top:1px solid rgba(0,255,255,.16);
  font-size:15px;color:#8fbca4;
}
.cr{margin:0}
.to-top{margin:0}
.to-top a{
  display:inline-flex;align-items:center;min-height:42px;padding:4px 14px;
  border-radius:999px;border:1px solid rgba(0,255,255,.3);color:#cdf2dd;
}
.to-top a:hover,.to-top a:focus-visible{color:var(--ink);background:var(--neon);border-color:transparent}

:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}

/* ---------- 响应式 ---------- */
@media (max-width:980px){
  .reader{grid-template-columns:minmax(0,1fr);gap:18px}
  .side{position:static;order:2;top:auto}
  .prose{order:1}
  .toc{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 8px}
  .foot-grid{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:760px){
  body{font-size:16px}
  .bar-nav{overflow-x:auto;padding-bottom:6px;scrollbar-width:thin}
  .menu{flex-wrap:nowrap}
  .m-link{white-space:nowrap}
  .drop-list{
    position:static;min-width:0;margin-top:6px;
    box-shadow:none;background:rgba(0,255,255,.07);
    border-color:rgba(105,255,105,.3);
  }
  .drop.open .drop-list{display:block}
  .hero{min-height:calc(100svh - 104px);padding-top:22px}
  .prose{padding:16px 14px}
  .prose div{padding:20px 0;scroll-margin-top:132px}
  .toc{grid-template-columns:minmax(0,1fr)}
  .foot{padding-bottom:26px}
  .foot-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
}

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