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

:root{
  --neon:#87ff71;
  --cyan:#01cdfe;
  --ink:#192617;
  --ink-2:#0e170e;
  --text:#e0f6e4;
  --dim:#9fbb9f;
  --line:rgba(135,255,113,.22);
  --panel:rgba(28,44,28,.62);
  --r:10px;
}

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

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

body{
  margin:0;
  min-height:100vh;
  overflow-x:clip;
  font-family:Inter,-apple-system,"Segoe UI","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.75;
  color:var(--text);
  background:
    radial-gradient(1200px 620px at 50% -12%, rgba(1,205,254,.20), transparent 62%),
    radial-gradient(900px 520px at 12% 108%, rgba(135,255,113,.14), transparent 66%),
    var(--ink-2);
  background-attachment:fixed;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:9;
  pointer-events:none;
  background:repeating-linear-gradient(180deg, rgba(6,14,6,.42) 0 1px, transparent 1px 3px);
  opacity:.55;
}

body::after{
  content:"";
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  height:44vh;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(135,255,113,.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(1,205,254,.16) 1px, transparent 1px);
  background-size:64px 64px, 64px 64px;
  transform:perspective(340px) rotateX(66deg);
  transform-origin:bottom center;
  -webkit-mask-image:linear-gradient(180deg, transparent, #000 40%, #000);
  mask-image:linear-gradient(180deg, transparent, #000 40%, #000);
  opacity:.5;
}

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

a{color:var(--cyan)}

/* ---------- 顶部 ---------- */

.topbar{
  position:sticky;
  top:0;
  z-index:20;
  display:flex;
  align-items:center;
  gap:14px;
  padding:10px clamp(12px,3vw,32px);
  background:rgba(14,23,14,.88);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:9px;
  flex:none;
  min-height:44px;
  padding:0 6px;
  font-size:1.06rem;
  font-weight:700;
  letter-spacing:.02em;
  color:#eefff0;
  text-decoration:none;
  text-shadow:0 0 16px rgba(135,255,113,.6);
}

.brand-dot{
  width:10px;
  height:10px;
  border-radius:50%;
  background:var(--neon);
  box-shadow:0 0 12px var(--neon),0 0 26px rgba(135,255,113,.7);
}

.topbar nav{
  flex:1 1 auto;
  min-width:0;
  overflow-x:auto;
  overflow-y:hidden;
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
}

.topbar nav::-webkit-scrollbar{display:none}

.topbar nav p{
  margin:0;
  display:flex;
  flex-wrap:nowrap;
  gap:8px;
}

.pill{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:8px 16px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(135,255,113,.07);
  color:#d3ecd8;
  font-size:.94rem;
  white-space:nowrap;
  text-decoration:none;
  transition:color .22s,background .22s,border-color .22s,box-shadow .22s;
}

.pill:hover,.pill:focus-visible{
  color:#0c150c;
  background:var(--neon);
  border-color:var(--neon);
  box-shadow:0 0 24px rgba(135,255,113,.55);
}

/* ---------- 首屏 ---------- */

.hero{
  position:relative;
  z-index:1;
  display:grid;
  place-content:center;
  justify-items:center;
  gap:18px;
  text-align:center;
  min-height:70vh;
  padding:clamp(44px,11vh,104px) clamp(16px,5vw,40px) clamp(52px,9vh,96px);
  overflow:hidden;
}

.hero > *:not(.sun){position:relative;z-index:2}

.sun{
  position:absolute;
  left:50%;
  top:clamp(18px,6vh,64px);
  transform:translateX(-50%);
  width:min(520px,82vw);
  aspect-ratio:1;
  margin:0;
  border-radius:50%;
  overflow:hidden;
  background:radial-gradient(circle at 50% 60%, #f2fff4 0%, var(--neon) 24%, rgba(1,205,254,.92) 56%, rgba(14,23,14,0) 74%);
  filter:drop-shadow(0 0 60px rgba(1,205,254,.45));
  opacity:.88;
}

.sun-core{
  position:absolute;
  inset:0;
  border-radius:50%;
  background:radial-gradient(circle at 50% 88%, rgba(14,23,14,.9), transparent 62%);
}

.sun-slats{
  position:absolute;
  inset:0;
  border-radius:50%;
  background:repeating-linear-gradient(180deg, rgba(14,23,14,.42) 0 2px, transparent 2px 9px);
  -webkit-mask-image:linear-gradient(180deg, transparent 20%, #000 55%, #000);
  mask-image:linear-gradient(180deg, transparent 20%, #000 55%, #000);
}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:9px;
  margin:0;
  padding:7px 18px;
  border-radius:999px;
  border:1px solid rgba(1,205,254,.5);
  background:rgba(1,205,254,.12);
  color:#c4f4ff;
  font-size:.9rem;
  letter-spacing:.14em;
  box-shadow:0 0 22px rgba(1,205,254,.28) inset;
}

.kicker-dot{
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 12px var(--cyan);
}

.hero h1{
  margin:0;
  max-width:16ch;
  font-size:clamp(2.1rem,8.5vw,5.4rem);
  font-weight:800;
  line-height:1.04;
  letter-spacing:-.035em;
  background:linear-gradient(178deg,#f4fff6 4%,#87ff71 52%,#01cdfe 96%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 26px rgba(135,255,113,.35));
  animation:glow 6s ease-in-out infinite;
}

@keyframes glow{
  0%,100%{filter:drop-shadow(0 0 22px rgba(135,255,113,.28))}
  48%{filter:drop-shadow(0 0 40px rgba(1,205,254,.5))}
  52%{filter:drop-shadow(0 0 40px rgba(135,255,113,.55))}
}

.lede{
  margin:0;
  max-width:46ch;
  color:#b9d8be;
  font-size:clamp(1rem,1.7vw,1.1rem);
  line-height:1.8;
}

/* ---------- 主体 + 右侧栏 ---------- */

.stage{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:minmax(0,1fr) 300px;
  gap:clamp(20px,3vw,40px);
  max-width:1180px;
  margin:0 auto;
  padding:clamp(30px,6vw,72px) clamp(14px,4vw,32px);
}

.stage-main{min-width:0}

.stage-main > article,
article[id]{
  scroll-margin-top:104px;
}

.stage-main > article{
  position:relative;
  margin:0 0 22px;
  padding:clamp(20px,3vw,34px);
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--panel);
  box-shadow:0 18px 42px -26px rgba(0,0,0,.95), inset 0 1px 0 rgba(255,255,255,.03);
  transition:transform .35s ease, border-color .35s ease, box-shadow .35s ease;
}

.stage-main > article:hover{
  transform:translateY(-3px);
  border-color:rgba(1,205,254,.5);
  box-shadow:0 26px 54px -26px rgba(1,205,254,.5), inset 0 1px 0 rgba(255,255,255,.05);
}

.stage-main > article:last-child{margin-bottom:0}

.stage-main h2,
.stage-main h3{
  margin:1.5em 0 .6em;
  color:#eefff0;
  line-height:1.36;
  letter-spacing:-.01em;
}

.stage-main h2{font-size:clamp(1.2rem,2.5vw,1.5rem)}
.stage-main h3{font-size:clamp(1.06rem,2vw,1.2rem)}

.stage-main > article > h2:first-child,
.stage-main > article > h3:first-child{margin-top:0}

h2 > span,
h3 > span{position:relative;display:inline-block;padding-bottom:7px}

h2 > span::after,
h3 > span::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  bottom:0;
  height:2px;
  background:linear-gradient(90deg,var(--neon),var(--cyan));
  box-shadow:0 0 12px rgba(135,255,113,.7);
}

.stage-main p{margin:0 0 1.05em}
.stage-main p:last-child{margin-bottom:0}

.stage-main ul,.stage-main ol{padding-left:1.25em;margin:0 0 1.05em}
.stage-main li{margin:.4em 0}
.stage-main strong{color:#f2fff4}
.stage-main a{color:var(--cyan);text-underline-offset:3px}
.stage-main a:hover{color:var(--neon)}

.stage-main blockquote{
  margin:1.2em 0;
  padding:.6em 0 .6em 1.1em;
  border-left:2px solid var(--cyan);
  color:#c7e6cc;
}

.stage-main table{
  width:100%;
  border-collapse:collapse;
  font-size:.95rem;
  margin:0 0 1.1em;
}

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

.stage-main figure{margin:1.2em 0}
.stage-main figcaption{color:var(--dim);font-size:.88rem}

/* ---------- 侧栏 ---------- */

.rail{
  position:sticky;
  top:82px;
  align-self:start;
  padding:18px 16px 20px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:linear-gradient(180deg, rgba(1,205,254,.13), rgba(135,255,113,.05));
  box-shadow:0 20px 46px -30px rgba(1,205,254,.75);
}

.rail h2{
  margin:0 0 .55em;
  font-size:1rem;
  letter-spacing:.06em;
  color:#e9fff0;
}

.rail h2 + .rail-list{margin-bottom:18px}
.rail h2:not(:first-child){margin-top:6px}

.rail-list{
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:rail;
  display:grid;
  gap:4px;
}

.rail-list li a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:40px;
  padding:4px 8px;
  border-radius:8px;
  color:#cfe9d4;
  font-size:.94rem;
  text-decoration:none;
  transition:background .2s, color .2s;
}

.rail-list li a::before{
  counter-increment:rail;
  content:counter(rail,decimal-leading-zero);
  color:var(--cyan);
  font-size:.78rem;
  letter-spacing:.08em;
}

.rail-list li a:hover,
.rail-list li a:focus-visible{
  background:rgba(135,255,113,.16);
  color:#f4fff6;
}

.rail-back{margin:0}
.rail-back a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 10px;
  border-radius:999px;
  border:1px solid var(--line);
  color:#d3ecd8;
  font-size:.92rem;
  text-decoration:none;
}

.rail-back a:hover{background:var(--neon);color:#0c150c}

/* ---------- 页脚 ---------- */

footer{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.5fr 1fr auto;
  align-items:start;
  gap:18px 24px;
  max-width:1180px;
  margin:24px auto 0;
  padding:clamp(28px,5vw,58px) clamp(16px,4vw,32px) 22px;
  border-top:1px solid var(--line);
}

.foot-brand{
  margin:0;
  grid-column:1;
  font-size:clamp(1.9rem,7vw,3.4rem);
  font-weight:800;
  line-height:1;
  letter-spacing:-.035em;
  background:linear-gradient(180deg,#f4fff6,#87ff71 58%,#01cdfe);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 20px rgba(135,255,113,.28));
}

.foot-text{
  margin:0;
  color:var(--dim);
  font-size:.94rem;
  max-width:34ch;
}

.foot-links{
  margin:0;
  display:flex;
  flex-wrap:wrap;
  gap:6px 16px;
}

.foot-links a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  color:#cfe9d4;
  font-size:.94rem;
  text-decoration:none;
  border-bottom:1px solid rgba(135,255,113,.38);
}

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

footer small{
  grid-column:1 / -1;
  padding-top:14px;
  border-top:1px solid rgba(135,255,113,.14);
  color:#7f9a84;
  font-size:.85rem;
}

/* ---------- 动效 ---------- */

.rv{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .62s ease, transform .62s cubic-bezier(.2,.7,.3,1);
}

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

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none !important;transition:none !important}
  .rv{opacity:1;transform:none}
}

/* ---------- 断点 ---------- */

@media (max-width:900px){
  .stage{grid-template-columns:minmax(0,1fr)}
  .rail{position:static}
  .rail h2{margin-top:0}
  .stage-main > article{margin-bottom:16px}
  footer{grid-template-columns:1fr 1fr}
  .foot-brand{grid-column:1 / -1}
  .foot-text{grid-column:1 / -1;max-width:none}
}

@media (max-width:640px){
  body{font-size:16.5px}
  .hero{min-height:54vh;padding-top:clamp(34px,8vh,64px)}
  .sun{width:min(360px,86vw);top:8px;opacity:.7}
  .topbar{gap:8px;padding:8px 12px}
  .brand{font-size:1rem}
  .pill{padding:8px 13px;font-size:.9rem}
  .rail{padding:14px 12px 16px}
  footer{grid-template-columns:1fr;gap:12px}
  .stage-main table{display:block;overflow-x:auto}
}

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