@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@400;500;600;700&family=Comic+Neue:wght@300;400;700&display=swap');

:root{
  --neon:#87ff71;
  --cyan:#01cdfe;
  --ink:#192617;
  --pink:#ff71ce;
  --purple:#b967ff;
  --paper:#eaffea;
  --line:rgba(135,255,113,.24);
  --glass:rgba(255,255,255,.055);
  --r:10px;
}

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

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

body{
  margin:0;
  min-height:100vh;
  overflow-x:hidden;
  font-family:"Baloo 2","Comic Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.78;
  color:var(--paper);
  background-color:#0b140f;
  background-image:
    radial-gradient(120% 70% at 50% -12%, rgba(1,205,254,.30), transparent 62%),
    radial-gradient(90% 62% at 94% 4%, rgba(255,113,206,.24), transparent 60%),
    radial-gradient(80% 60% at 2% 32%, rgba(185,103,255,.18), transparent 66%),
    linear-gradient(180deg,#0a1310 0%,#101f18 44%,#192617 100%);
  background-attachment:fixed;
  background-repeat:no-repeat;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:70;
  pointer-events:none;
  opacity:.65;
  mix-blend-mode:overlay;
  background:repeating-linear-gradient(180deg,rgba(255,255,255,.05) 0 1px,transparent 1px 3px);
}

img{max-width:100%}

a{color:var(--cyan)}

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

/* 页头：品牌行 + 折叠菜单行 */
.hdr{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(10,20,15,.78);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
}

.hdr-row{
  max-width:1180px;
  margin:0 auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:10px 18px 4px;
}

.logo{
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:4px 2px;
  text-decoration:none;
  color:var(--paper);
  font-weight:700;
  font-size:17px;
  letter-spacing:.04em;
  text-shadow:0 0 14px rgba(135,255,113,.7);
}

.logo img{width:30px;height:30px;border-radius:8px;display:block}

.cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:8px 16px;
  border-radius:999px;
  text-decoration:none;
  font-weight:700;
  font-size:16px;
  white-space:nowrap;
  color:#08170c;
  background:linear-gradient(105deg,var(--neon),var(--cyan));
  box-shadow:0 0 0 1px rgba(1,205,254,.5),0 12px 26px -14px var(--neon);
}

.cta:hover{filter:hue-rotate(-20deg)}

.menu{max-width:1180px;margin:0 auto;padding:0 18px}

.menu summary{
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:6px 14px;
  margin-bottom:8px;
  border:1px solid rgba(1,205,254,.45);
  border-radius:var(--r);
  color:#c8f8ff;
  background:rgba(1,205,254,.09);
  font-weight:600;
  font-size:16px;
  cursor:pointer;
  list-style:none;
}

.menu summary::-webkit-details-marker{display:none}

.menu summary::after{
  content:"";
  width:8px;
  height:8px;
  border-right:2px solid currentColor;
  border-bottom:2px solid currentColor;
  transform:rotate(45deg) translateY(-2px);
  transition:transform .25s ease;
}

.menu[open] summary::after{transform:rotate(225deg) translateY(-2px)}

.menu menu{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin:0;
  padding:0 0 12px;
}

.menu li a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 13px;
  border-radius:var(--r);
  border:1px solid transparent;
  text-decoration:none;
  color:#d9f8d9;
  font-size:16px;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}

.menu li a:hover,
.menu li a:focus-visible{
  color:#08170c;
  background:linear-gradient(100deg,var(--neon),var(--cyan));
  border-color:transparent;
}

/* 首屏 */
.hero{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  min-height:100vh;
  min-height:100svh;
  display:flex;
  align-items:center;
  justify-content:flex-end;
  text-align:right;
  padding:100px 22px 140px;
}

.hero::before{
  content:"";
  position:absolute;
  top:-12%;
  right:-22%;
  width:min(720px,92vw);
  aspect-ratio:1;
  z-index:-2;
  border-radius:50%;
  background:radial-gradient(circle,rgba(255,113,206,.5),rgba(1,205,254,.22) 46%,transparent 70%);
  filter:blur(18px);
  animation:breathe 9s ease-in-out infinite;
}

.hero::after{
  content:"";
  position:absolute;
  left:-30%;
  right:-30%;
  bottom:-4vh;
  height:52vh;
  z-index:-1;
  background-image:
    linear-gradient(rgba(135,255,113,.35) 1px,transparent 1px),
    linear-gradient(90deg,rgba(1,205,254,.3) 1px,transparent 1px);
  background-size:64px 64px;
  transform:perspective(320px) rotateX(69deg);
  transform-origin:bottom center;
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 45%);
  mask-image:linear-gradient(180deg,transparent,#000 45%);
}

@keyframes breathe{
  0%,100%{transform:scale(1);opacity:.72}
  50%{transform:scale(1.12);opacity:1}
}

.hero-in{
  position:relative;
  z-index:1;
  max-width:760px;
  margin-left:auto;
}

.band{
  position:absolute;
  left:-24vw;
  right:-6vw;
  top:52%;
  height:84px;
  z-index:-1;
  transform:translateY(-50%) skewY(-8deg);
  opacity:.55;
  filter:blur(1px);
  background:linear-gradient(90deg,rgba(135,255,113,0),rgba(135,255,113,.55) 30%,rgba(1,205,254,.5) 62%,rgba(255,113,206,.45));
}

.hero h1{
  margin:0;
  font-size:clamp(2.4rem,8.6vw,5rem);
  line-height:1.04;
  letter-spacing:-.01em;
  background:linear-gradient(96deg,#dcffd6,var(--neon) 34%,var(--cyan) 68%,var(--pink));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 16px rgba(135,255,113,.45));
}

.hero-p{
  margin:18px 0 0;
  margin-left:auto;
  max-width:34ch;
  color:#cfeccf;
}

/* 主区 */
.wrap{
  max-width:1180px;
  margin:0 auto;
  padding:44px 20px 76px;
}

.stage{
  display:grid;
  grid-template-columns:248px minmax(0,1fr);
  gap:28px;
  align-items:start;
}

.side{
  position:sticky;
  top:96px;
  padding:16px 14px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  box-shadow:0 24px 48px -34px #000;
}

.side h2{
  margin:0 0 2px;
  font-size:1.02rem;
  line-height:1.45;
  letter-spacing:.05em;
  color:var(--neon);
  text-shadow:0 0 12px rgba(135,255,113,.45);
}

.side h2 span{display:block}

.side h3{
  margin:16px 0 8px;
  font-size:.86rem;
  font-weight:600;
  letter-spacing:.22em;
  color:#9fe6f0;
}

.side h3 span{
  display:inline-block;
  padding-bottom:5px;
  border-bottom:2px solid var(--cyan);
}

.side menu{list-style:none;margin:0;padding:0}

.side menu li + li{margin-top:2px}

.side menu a{
  display:block;
  min-height:40px;
  padding:9px 10px;
  border-radius:8px;
  border-left:2px solid transparent;
  text-decoration:none;
  color:#d8f2d8;
  font-size:16px;
  line-height:1.5;
  transition:background .18s ease,border-color .18s ease,color .18s ease;
}

.side menu a:hover,
.side menu a:focus-visible{
  color:#fff;
  background:rgba(135,255,113,.12);
  border-left-color:var(--neon);
}

/* 正文 */
.doc{
  padding:26px 22px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  box-shadow:0 30px 60px -48px #000;
}

.doc div{
  padding:34px 0;
  border-top:1px dashed rgba(135,255,113,.22);
  scroll-margin-top:130px;
}

.doc div:first-child{border-top:0;padding-top:0}
.doc div:last-child{padding-bottom:0}

.doc h2{
  margin:0 0 16px;
  font-size:clamp(1.35rem,3.2vw,1.85rem);
  line-height:1.3;
  color:#f0fff0;
  text-shadow:0 0 16px rgba(1,205,254,.4);
}

.doc h2 span{display:inline-block;position:relative}

.doc h2 span::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-7px;
  height:3px;
  border-radius:3px;
  background:linear-gradient(90deg,var(--neon),var(--cyan),rgba(255,113,206,0));
}

.doc h3{
  margin:24px 0 10px;
  font-size:1.15rem;
  line-height:1.42;
  color:#e6ffe6;
}

.doc h3 span{
  display:inline-block;
  padding-left:12px;
  border-left:4px solid var(--neon);
}

.doc p{margin:0 0 14px;color:#d6eed6}

.doc a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}

.doc ul,
.doc ol{margin:0 0 16px;padding-left:1.25em;color:#d6eed6}

.doc li{margin:.35em 0}

.doc strong{color:#fff}

.doc img{
  display:block;
  height:auto;
  margin:16px 0;
  border:1px solid var(--line);
  border-radius:var(--r);
}

.doc blockquote{
  margin:18px 0;
  padding:12px 16px;
  border-left:3px solid var(--neon);
  border-radius:0 var(--r) var(--r) 0;
  background:rgba(135,255,113,.08);
  color:#cfeccf;
}

.doc blockquote p:last-child{margin:0}

.doc table{
  width:100%;
  margin:16px 0;
  border-collapse:collapse;
  font-size:.96rem;
}

.doc th,
.doc td{
  padding:9px 11px;
  border:1px solid rgba(1,205,254,.28);
  text-align:left;
}

.doc th{background:rgba(1,205,254,.12);color:#eafcff}

.doc hr{
  height:1px;
  margin:24px 0;
  border:0;
  background:linear-gradient(90deg,transparent,var(--line),transparent);
}

.doc code{
  padding:.1em .35em;
  border-radius:5px;
  background:rgba(1,205,254,.14);
  font-family:ui-monospace,Menlo,Consolas,monospace;
  font-size:.92em;
}

/* 页脚 */
.ftr{
  padding:24px 20px 32px;
  border-top:1px solid var(--line);
  background:rgba(8,16,12,.82);
  text-align:center;
}

.ftr p{margin:0;color:#bfe0bf;font-size:.95rem;letter-spacing:.04em}

.ftr small{display:block;margin-top:6px;font-size:.92rem}

.ftr small a{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:8px 16px;
  border:1px solid var(--line);
  border-radius:999px;
  text-decoration:none;
  color:var(--neon);
}

.ftr small a:hover{background:rgba(135,255,113,.14)}

/* 滚动揭示 */
html.js .reveal{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .6s ease,transform .6s ease;
}

html.js .reveal.in{opacity:1;transform:none}

@media (max-width:860px){
  .stage{grid-template-columns:1fr;gap:20px}
  .side{position:static;top:auto}
  .side menu{display:grid;grid-template-columns:1fr 1fr;gap:4px}
  .hero{padding:88px 18px 118px}
}

@media (max-width:520px){
  body{font-size:16px}
  .hdr-row{padding:8px 14px 4px}
  .logo{font-size:16px}
  .menu{padding:0 14px}
  .menu li a{padding:8px 11px}
  .wrap{padding:28px 14px 56px}
  .doc{padding:20px 15px}
  .hero h1{font-size:clamp(2.1rem,10.4vw,3rem)}
  .band{height:64px}
  .hero-p{max-width:28ch}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js .reveal{opacity:1;transform:none}
}

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