@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,400;0,500;0,700;1,400&family=Nunito:ital,wght@0,700;0,800;0,900;1,700&display=swap');

:root{
  --mint:#87ff71;
  --cyan:#01cdfe;
  --ink:#192617;
  --deep:#101a0f;
  --clay:#22331f;
  --pink:#ff71ce;
  --violet:#b967ff;
  --text:#e7ffdf;
  --dim:#a9cba2;
  --edge:rgba(135,255,113,.18);
  --f-head:"Nunito","DM Sans",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --f-body:"DM Sans","Nunito",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;overflow-x:hidden;
  font-family:var(--f-body);font-size:17px;line-height:1.75;
  color:var(--text);background:var(--ink);
  background-image:
    radial-gradient(120% 55% at 50% -8%,rgba(1,205,254,.24),transparent 62%),
    radial-gradient(70% 45% at 96% 4%,rgba(255,113,206,.18),transparent 60%),
    linear-gradient(180deg,#20301c,var(--ink) 38%,var(--deep));
}
body::after{
  content:"";position:fixed;inset:0;z-index:60;pointer-events:none;opacity:.42;
  background:repeating-linear-gradient(180deg,rgba(255,255,255,.05) 0 1px,transparent 1px 3px);
}
img{max-width:100%;height:auto;display:block;border-radius:10px}
a{color:var(--cyan)}
.sr{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
:focus-visible{outline:2px solid var(--mint);outline-offset:3px}

/* 顶部两行：品牌行 / 菜单行 */
.top{
  position:relative;z-index:40;
  background:linear-gradient(180deg,rgba(16,26,15,.97),rgba(16,26,15,.82));
  border-bottom:1px solid var(--edge);
}
.bar{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  max-width:1180px;margin:0 auto;padding:12px 20px;
}
.brand{
  display:inline-flex;align-items:center;gap:10px;min-height:46px;
  text-decoration:none;color:var(--mint);
  font-family:var(--f-head);font-weight:900;font-size:1.3rem;letter-spacing:.08em;
  text-shadow:0 0 14px rgba(135,255,113,.6),0 0 32px rgba(1,205,254,.35);
  transition:filter .2s ease;
}
.brand:hover{filter:hue-rotate(-25deg) saturate(1.2)}
.mark{width:32px;height:32px;flex:none;filter:drop-shadow(0 0 8px rgba(135,255,113,.6))}

.find{
  display:flex;align-items:center;gap:4px;
  background:var(--clay);border-radius:10px;padding:3px 5px;
  box-shadow:inset 0 2px 0 rgba(255,255,255,.05);
}
.find input{
  width:132px;min-height:40px;padding:6px 10px;border:0;border-radius:8px;
  background:transparent;color:var(--text);font:inherit;font-size:16px;outline:none;
}
.find input::placeholder{color:#8fb089}
.find button{
  display:grid;place-items:center;width:40px;height:40px;padding:0;border:0;cursor:pointer;
  border-radius:8px;background:linear-gradient(135deg,var(--mint),var(--cyan));color:var(--ink);
}
.find button svg{width:17px;height:17px;fill:currentColor}
.find button:hover{background:linear-gradient(135deg,var(--cyan),var(--violet));color:#0b150a}

.railnav{max-width:1180px;margin:0 auto;padding:0 20px 12px}
.railnav summary{
  display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:6px 16px;
  list-style:none;cursor:pointer;border-radius:999px;
  background:rgba(1,205,254,.13);color:var(--cyan);
  font-family:var(--f-head);font-weight:800;font-size:1rem;letter-spacing:.22em;
}
.railnav summary::-webkit-details-marker{display:none}
.railnav summary .burger{width:16px;height:16px;fill:currentColor;transition:transform .25s ease}
.railnav details[open] summary{background:rgba(135,255,113,.16);color:var(--mint)}
.railnav details[open] summary .burger{transform:rotate(90deg)}
.railnav menu{
  list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:11px 0 0;padding:0;
}
.railnav menu a{
  display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:8px 15px;
  border-radius:10px;background:var(--clay);color:var(--text);
  text-decoration:none;font-weight:700;white-space:nowrap;
  transition:transform .18s ease,background .18s ease,color .18s ease,box-shadow .18s ease;
}
.railnav menu .ico{width:10px;height:10px;flex:none;fill:var(--cyan);transition:fill .18s ease}
.railnav menu a:hover,.railnav menu a:focus-visible{
  color:#0b150a;transform:translateY(-2px);
  background:linear-gradient(120deg,var(--mint),var(--cyan));
  box-shadow:0 10px 24px rgba(1,205,254,.32);
}
.railnav menu a:hover .ico,.railnav menu a:focus-visible .ico{fill:#0b150a}

/* 首屏 */
.hero{
  position:relative;overflow:hidden;isolation:isolate;
  min-height:70vh;display:grid;place-items:center;
  text-align:center;padding:66px 24px 104px;
}
.hero::after{
  content:"";position:absolute;left:-8%;right:-8%;bottom:-2px;height:112px;z-index:0;
  transform:skewY(-2.6deg);transform-origin:left bottom;
  background:linear-gradient(180deg,rgba(255,113,206,.92),rgba(185,103,255,.86) 46%,rgba(1,205,254,.92));
  box-shadow:0 -22px 70px rgba(255,113,206,.28);
}
.hero .grid{
  position:absolute;left:-10%;right:-10%;bottom:-2px;height:152px;z-index:1;opacity:.5;
  transform:perspective(200px) rotateX(60deg);transform-origin:bottom center;
  background-image:
    linear-gradient(rgba(16,26,15,.9) 2px,transparent 2px),
    linear-gradient(90deg,rgba(16,26,15,.7) 2px,transparent 2px);
  background-size:100% 24px,42px 100%;
}
.hero-txt{position:relative;z-index:3;max-width:640px}
.hero h1{
  margin:0 0 18px;font-family:var(--f-head);font-weight:900;
  font-size:clamp(2rem,6.2vw,3.4rem);line-height:1.14;color:#f5ffef;
  text-shadow:0 0 18px rgba(135,255,113,.6),0 0 46px rgba(1,205,254,.4),5px 5px 0 rgba(1,205,254,.3);
  animation:rise .7s both;
}
.hero .lead{
  margin:0 auto;max-width:44ch;color:#d7f1d0;font-size:1.0625rem;
  text-shadow:0 1px 0 rgba(16,26,15,.55);
  animation:rise .7s .1s both;
}
.art{
  position:absolute;right:4%;top:50%;z-index:2;width:172px;
  transform:translateY(-50%);
  filter:drop-shadow(0 0 26px rgba(1,205,254,.55));
  animation:float 7s ease-in-out infinite;
}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@keyframes float{50%{transform:translateY(calc(-50% - 12px))}}

/* 主体 */
main{
  display:grid;grid-template-columns:264px minmax(0,1fr);gap:46px;
  max-width:1180px;margin:0 auto;padding:52px 24px 84px;align-items:start;
}
.side{
  position:sticky;top:150px;
  background:var(--clay);border-radius:10px;padding:20px 16px 16px;
  box-shadow:8px 8px 0 rgba(16,26,15,.55);
}
.side small{
  display:block;font-size:1rem;letter-spacing:.26em;color:var(--cyan);
}
.side-h{
  margin:4px 0 14px;font-family:var(--f-head);font-weight:900;font-size:1.4rem;
  color:#f2ffe9;text-shadow:0 0 14px rgba(135,255,113,.4);
}
.side-list{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.side-list a{
  display:flex;align-items:center;gap:10px;min-height:44px;padding:7px 8px;
  border-radius:8px;color:var(--dim);text-decoration:none;font-size:1rem;
  transition:color .16s ease,background .16s ease;
}
.side-list .num{
  font-family:var(--f-head);font-weight:900;color:rgba(1,205,254,.72);
  font-variant-numeric:tabular-nums;
}
.side-list a:hover,.side-list a[aria-current="true"]{color:var(--mint);background:rgba(135,255,113,.1)}

.prose{min-width:0;max-width:70ch}
.prose div{
  margin:0 0 22px;padding:28px 22px;border-radius:10px;scroll-margin-top:150px;
  background:linear-gradient(158deg,rgba(1,205,254,.075),rgba(135,255,113,.045));
}
.prose h2{
  margin:0 0 14px;font-family:var(--f-head);font-weight:900;line-height:1.28;
  font-size:clamp(1.5rem,3.3vw,2rem);color:#f5ffef;
  text-shadow:0 0 16px rgba(135,255,113,.35);
}
.prose h2::after{
  content:"";display:block;width:74px;height:4px;margin-top:12px;border-radius:2px;
  background:linear-gradient(90deg,var(--pink),var(--violet),var(--cyan));
}
.prose h3{
  margin:26px 0 10px;font-family:var(--f-head);font-weight:800;
  font-size:1.22rem;line-height:1.4;color:#eaffdf;
}
.prose p{margin:0 0 16px}
.prose p:last-child{margin-bottom:0}
.prose a{color:var(--cyan);text-underline-offset:3px}
.prose a:hover{color:var(--mint)}
.prose ul,.prose ol{margin:0 0 16px;padding-left:1.4em}
.prose li{margin:0 0 8px}
.prose li::marker{color:var(--mint)}
.prose strong{color:#f6fff1}
.prose blockquote{
  margin:0 0 16px;padding:12px 18px;border-radius:10px;
  background:rgba(255,113,206,.1);color:#ffe9f8;
}
.prose blockquote p:last-child{margin-bottom:0}
.prose figure{margin:0 0 18px}
.prose figcaption{margin-top:8px;font-size:1rem;color:var(--dim)}
.prose hr{border:0;height:1px;margin:24px 0;background:var(--edge)}
.prose table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:1rem}
.prose th,.prose td{padding:9px 12px;text-align:left;border-bottom:1px solid var(--edge)}

/* 页脚 */
.foot{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;
  max-width:1180px;margin:0 auto;padding:22px 24px 36px;
  border-top:1px solid rgba(1,205,254,.2);
}
.foot address{font-style:normal;color:var(--dim);text-shadow:0 0 12px rgba(1,205,254,.3)}
.foot-list{list-style:none;display:flex;flex-wrap:wrap;gap:4px;margin:0;padding:0}
.foot-list a{
  display:inline-flex;align-items:center;min-height:44px;padding:6px 12px;
  border-radius:8px;color:var(--text);text-decoration:none;
  transition:background .16s ease,color .16s ease;
}
.foot-list a:hover{background:var(--mint);color:var(--ink)}

.to-top{
  position:fixed;right:16px;bottom:16px;z-index:70;
  display:grid;place-items:center;width:48px;height:48px;border-radius:12px;
  background:linear-gradient(140deg,var(--mint),var(--cyan));color:var(--ink);
  box-shadow:0 10px 26px rgba(1,205,254,.4);
  opacity:0;pointer-events:none;transform:translateY(10px);
  transition:opacity .2s ease,transform .2s ease;
}
.to-top.show{opacity:1;pointer-events:auto;transform:none}
.to-top svg{width:22px;height:22px;fill:currentColor}

@media (min-width:901px){
  .top{position:sticky;top:0}
}

@media (max-width:900px){
  body{font-size:17px}
  .bar{padding:10px 16px}
  .brand{font-size:1.15rem}
  .find input{width:96px}
  .railnav{padding:0 16px 12px}
  .railnav menu{
    flex-wrap:nowrap;overflow-x:auto;padding-bottom:4px;
    scrollbar-width:none;-webkit-overflow-scrolling:touch;
  }
  .railnav menu::-webkit-scrollbar{display:none}
  .hero{min-height:62vh;padding:56px 20px 96px}
  .hero .lead{font-size:1rem}
  .art{width:86px;top:14px;right:10px;transform:none;opacity:.62;animation:none;filter:drop-shadow(0 0 14px rgba(1,205,254,.5))}
  main{grid-template-columns:1fr;gap:24px;padding:32px 16px 60px}
  .side{position:static;box-shadow:none}
  .prose{max-width:none}
  .prose div{padding:22px 16px;scroll-margin-top:24px}
  .foot{padding:18px 16px 30px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .art{transform:translateY(-50%)}
}
@media (prefers-reduced-motion:reduce) and (max-width:900px){
  .art{transform:none}
}

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