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

:root{
  --ink:#192617;
  --ink-2:#0f1a14;
  --lime:#87ff71;
  --cyan:#01cdfe;
  --pink:#ff71ce;
  --violet:#b967ff;
  --paper:#e9ffe5;
  --muted:#a6c6a1;
  --r:28px;
  --max:1120px;
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  overflow-x:hidden;
  max-width:100%;
}

body{
  margin:0;
  font-family:"IBM Plex Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.75;
  color:var(--paper);
  background:
    radial-gradient(900px 520px at 82% -8%,rgba(185,103,255,.22),transparent 70%),
    radial-gradient(760px 440px at 6% 0%,rgba(1,205,254,.18),transparent 66%),
    var(--ink);
  overflow-x:clip;
  max-width:100%;
}

img{max-width:100%;height:auto;display:block}

a{color:var(--lime);text-decoration:none}

p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.2em}
li{margin:.25em 0}
strong{color:#f6fff3}
code{font-size:.95em;background:rgba(1,205,254,.12);border-radius:6px;padding:.1em .4em}

.scan{
  position:fixed;
  inset:0;
  z-index:9;
  pointer-events:none;
  background:repeating-linear-gradient(180deg,rgba(255,255,255,.05) 0 1px,transparent 1px 4px);
  mix-blend-mode:screen;
  opacity:.55;
}

/* ---- masthead ---- */
.masthead{
  max-width:var(--max);
  margin:0 auto;
  padding:14px 18px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  min-width:0;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:40px;
  min-width:0;
  color:#f4fff1;
  font-weight:600;
  letter-spacing:.08em;
  text-decoration:none;
}

.mark{
  flex:0 0 auto;
  width:20px;
  height:20px;
  border-radius:6px;
  background:conic-gradient(from 200deg,var(--lime),var(--cyan),var(--violet),var(--pink),var(--lime));
  box-shadow:0 0 16px rgba(1,205,254,.65);
}

.brand-txt{
  min-width:0;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}

.cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 18px;
  border-radius:999px;
  background:linear-gradient(120deg,var(--lime),var(--cyan));
  color:#10200f;
  font-weight:600;
  font-size:15px;
  letter-spacing:.06em;
  box-shadow:0 0 20px -4px rgba(135,255,113,.7);
  transition:transform .18s ease,box-shadow .18s ease;
}

.cta:hover{
  transform:translateY(-1px);
  box-shadow:0 0 26px -2px rgba(1,205,254,.85);
}

/* ---- sticky anchor rail ---- */
.rail{
  position:sticky;
  top:0;
  z-index:30;
  max-width:100%;
  background:rgba(15,26,20,.9);
  backdrop-filter:blur(10px);
  border-top:1px solid rgba(135,255,113,.16);
  border-bottom:1px solid rgba(1,205,254,.3);
}

.drawer{
  max-width:var(--max);
  width:100%;
  min-width:0;
  margin:0 auto;
  padding:8px 12px;
  display:flex;
  align-items:center;
  gap:10px;
}

.drawer summary{
  flex:0 0 auto;
  list-style:none;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 15px;
  border-radius:999px;
  border:1px solid rgba(255,113,206,.45);
  color:var(--pink);
  font-size:14px;
  letter-spacing:.16em;
  background:rgba(255,113,206,.08);
}

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

.pills{
  flex:1 1 auto;
  min-width:0;
  max-width:100%;
  display:flex;
  flex-wrap:nowrap;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
  overflow-x:auto;
  overflow-y:hidden;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
}

.pills li{margin:0;flex:0 0 auto}

.pill{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 14px;
  border-radius:999px;
  border:1px solid rgba(135,255,113,.28);
  background:rgba(135,255,113,.06);
  color:var(--paper);
  font-size:15px;
  white-space:nowrap;
  transition:background .18s ease,color .18s ease,box-shadow .18s ease;
}

.pill:hover{
  background:var(--lime);
  color:#10200f;
  box-shadow:0 0 20px rgba(135,255,113,.5);
}

/* ---- hero ---- */
.hero{
  position:relative;
  overflow:hidden;
  max-width:100%;
  min-height:70vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  gap:20px;
  padding:56px 18px 64px;
  text-align:center;
}

.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(255,113,206,.24),rgba(185,103,255,.16) 44%,rgba(25,38,23,0) 82%);
}

.sun{
  position:absolute;
  top:6%;
  left:50%;
  transform:translateX(-50%);
  width:min(260px,58vw);
  height:min(260px,58vw);
  border-radius:50%;
  background:linear-gradient(180deg,var(--pink),var(--violet) 54%,var(--cyan));
  opacity:.55;
  filter:blur(2px) saturate(1.15);
  box-shadow:0 0 90px rgba(255,113,206,.55);
  will-change:transform;
}

.floor{
  position:absolute;
  left:0;
  right:0;
  bottom:-8px;
  height:46%;
  background-image:
    linear-gradient(rgba(1,205,254,.55) 1px,transparent 1px),
    linear-gradient(90deg,rgba(1,205,254,.32) 1px,transparent 1px);
  background-size:100% 34px,58px 100%;
  transform:perspective(340px) rotateX(72deg);
  transform-origin:bottom center;
  opacity:.5;
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 38%);
  mask-image:linear-gradient(180deg,transparent,#000 38%);
}

.badge{
  position:relative;
  z-index:2;
  max-width:100%;
  font-size:13px;
  letter-spacing:.34em;
  padding:6px 15px;
  border-radius:999px;
  border:1px solid rgba(1,205,254,.55);
  background:rgba(1,205,254,.1);
  color:var(--cyan);
  text-shadow:0 0 12px rgba(1,205,254,.85);
  animation:hue 9s linear infinite;
}

.hero h1{
  position:relative;
  z-index:2;
  margin:0;
  max-width:100%;
  font-size:clamp(2rem,7.4vw,4.2rem);
  line-height:1.12;
  font-weight:700;
  letter-spacing:.02em;
  color:#f4fff1;
  overflow-wrap:break-word;
  text-shadow:0 0 18px rgba(135,255,113,.55),0 0 48px rgba(1,205,254,.42);
}

@keyframes hue{to{filter:hue-rotate(360deg)}}

/* ---- body grid ---- */
main{
  max-width:var(--max);
  min-width:0;
  margin:0 auto;
  padding:42px 18px 70px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 258px;
  gap:32px;
  align-items:start;
}

.doc{min-width:0;overflow-wrap:break-word}

.doc > section{
  min-width:0;
  background:linear-gradient(170deg,rgba(255,255,255,.055),rgba(255,255,255,.012));
  border:1px solid rgba(135,255,113,.18);
  border-bottom:3px solid var(--lime);
  border-radius:var(--r);
  padding:26px 22px;
  margin:0 0 26px;
  scroll-margin-top:112px;
  box-shadow:0 20px 44px -32px #000;
}

.doc > section:nth-child(even){border-bottom-color:var(--cyan)}
.doc > section:last-child{margin-bottom:0}

.doc h2{
  margin:.1em 0 .55em;
  font-size:clamp(1.25rem,2.6vw,1.6rem);
  line-height:1.3;
  color:var(--lime);
  letter-spacing:.02em;
  text-shadow:0 0 16px rgba(135,255,113,.32);
}

.doc h3{
  margin:1.3em 0 .4em;
  font-size:1.12rem;
  color:var(--cyan);
}

.doc hr{
  border:0;
  height:2px;
  margin:0 0 1.1em;
  background:linear-gradient(90deg,var(--lime),var(--cyan),transparent);
}

.doc ul,.doc ol{padding-left:1.15em}
.doc li::marker{color:var(--cyan)}
.doc a{border-bottom:1px solid currentColor}
.doc a:hover{color:var(--cyan)}
.doc img{border-radius:18px;margin:1em 0;max-width:100%;height:auto}
.doc pre{max-width:100%;overflow-x:auto}
.doc table{border-collapse:collapse;max-width:100%}
.doc blockquote{
  margin:1.2em 0;
  padding:.6em 1em;
  border-left:3px solid var(--pink);
  background:rgba(255,113,206,.08);
  border-radius:0 16px 16px 0;
}

/* ---- aside ---- */
.side{
  position:sticky;
  top:88px;
  min-width:0;
  padding:18px 16px;
  border:1px solid rgba(1,205,254,.26);
  border-bottom:3px solid var(--cyan);
  border-radius:var(--r);
  background:rgba(15,26,20,.72);
}

.side h2{
  margin:0 0 .5em;
  font-size:1rem;
  letter-spacing:.18em;
  color:var(--cyan);
  text-shadow:0 0 14px rgba(1,205,254,.4);
}

.side hr{
  border:0;
  height:2px;
  margin:0 0 .7em;
  background:linear-gradient(90deg,rgba(255,113,206,.9),transparent);
}

.sidelist{
  list-style:none;
  counter-reset:s;
  margin:0;
  padding:0;
}

.sidelist li{
  counter-increment:s;
  margin:0;
}

.sidelist a{
  position:relative;
  display:block;
  min-height:40px;
  padding:10px 0 10px 30px;
  font-size:15px;
  color:var(--muted);
  border-bottom:1px dashed rgba(135,255,113,.14);
  transition:color .18s ease;
}

.sidelist a::before{
  content:counter(s,decimal-leading-zero);
  position:absolute;
  left:0;
  top:10px;
  font-size:13px;
  letter-spacing:.1em;
  color:var(--pink);
}

.sidelist a:hover{color:var(--lime)}

/* ---- footer ---- */
footer{
  max-width:var(--max);
  min-width:0;
  margin:0 auto;
  padding:0 18px 44px;
}

.foot-cta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-width:0;
  margin-bottom:34px;
  padding:28px 22px;
  border-radius:var(--r);
  border:1px solid rgba(255,113,206,.36);
  background:linear-gradient(120deg,rgba(255,113,206,.24),rgba(1,205,254,.2) 56%,rgba(135,255,113,.18));
}

.cta-xl{
  min-width:0;
  font-size:clamp(1.4rem,4vw,2.1rem);
  font-weight:700;
  color:#fff;
  letter-spacing:.04em;
  overflow-wrap:anywhere;
  text-shadow:0 0 22px rgba(1,205,254,.8);
}

.cta-xl:hover{color:var(--lime)}

.up{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 16px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.5);
  color:#fff;
  font-size:15px;
}

.up:hover{background:#fff;color:var(--ink-2)}

.foot-grid{
  display:grid;
  grid-template-columns:1.25fr 2fr;
  gap:28px;
  min-width:0;
  padding-top:28px;
  border-top:1px solid rgba(135,255,113,.22);
}

.foot-brand{min-width:0}

.foot-brand .desc{
  margin:12px 0 0;
  font-size:15px;
  color:var(--muted);
  overflow-wrap:break-word;
}

.foot-links{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:16px;
  min-width:0;
}

.foot-links dl{margin:0;min-width:0}

.foot-links dt{
  margin-bottom:8px;
  font-size:13px;
  letter-spacing:.22em;
  color:var(--cyan);
}

.foot-links dd{margin:0}

.foot-links dd a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:8px 0;
  font-size:15px;
  color:var(--paper);
  border-bottom:1px solid rgba(255,255,255,.08);
  transition:color .18s ease;
}

.foot-links dd a:hover{color:var(--lime)}

.copy{
  margin:26px 0 0;
  text-align:center;
  font-size:14px;
  letter-spacing:.1em;
  color:var(--muted);
}

/* ---- responsive ---- */
@media (max-width:880px){
  main{grid-template-columns:minmax(0,1fr);padding-bottom:52px}
  .side{position:static;order:2}
}

@media (max-width:560px){
  body{font-size:16px}
  .masthead{padding:10px 14px}
  .brand-txt{font-size:15px;max-width:44vw}
  .hero{min-height:58vh;padding:40px 16px 52px}
  .drawer{display:block;padding:8px 14px}
  .drawer summary{margin-bottom:8px}
  .pills{width:100%}
  main{padding:28px 14px 44px}
  footer{padding:0 14px 36px}
  .doc > section{padding:20px 16px;border-radius:22px}
  .foot-grid{grid-template-columns:minmax(0,1fr);gap:20px}
  .foot-links{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .foot-cta{padding:22px 16px}
  .doc table{display:block;overflow-x:auto}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none !important;transition:none !important}
  .sun{will-change:auto}
}

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