@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&display=swap');

:root{
  --lime:#87ff71;
  --sun:#ffce5c;
  --ink:#192617;
  --surface:#20301c;
  --paper:#eef7e6;
  --muted:#a9c39b;
  --r:28px;
}

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

html{scroll-behavior:smooth}
html.menu-open body{overflow:hidden}

body{
  margin:0;
  padding-left:96px;
  background:var(--ink);
  color:var(--paper);
  font-family:Inter,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:18px;
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

img{display:block;max-width:100%;height:auto}
a{color:inherit}
p{margin:0 0 14px}
button{font-family:inherit}

/* 顶部细条 */
.strip{
  position:fixed;top:0;left:96px;right:0;height:36px;z-index:40;
  background:var(--sun);color:var(--ink);
  display:flex;align-items:center;overflow:hidden;
  font-size:14px;font-weight:700;letter-spacing:.06em;
}
.strip-run{
  display:flex;align-items:center;gap:16px;padding-left:16px;
  white-space:nowrap;animation:slide 34s linear infinite;
}
.strip-dot{width:7px;height:7px;border-radius:50%;background:var(--ink);flex:none}
@keyframes slide{
  from{transform:translateX(0)}
  to{transform:translateX(-50%)}
}

/* 左侧竖条 */
.rail{
  position:fixed;left:0;top:0;bottom:0;width:96px;z-index:60;
  background:var(--lime);
  display:flex;flex-direction:column;align-items:center;justify-content:space-between;
  padding:18px 0 18px;
}
.rail::after{
  content:"";position:absolute;right:0;top:0;bottom:0;width:3px;
  background:repeating-linear-gradient(var(--ink) 0 11px,transparent 11px 22px);
}
.brand{
  display:flex;flex-direction:column;align-items:center;gap:14px;
  text-decoration:none;color:var(--ink);
}
.brand-mark{
  width:36px;height:36px;background:var(--ink);flex:none;
  clip-path:polygon(50% 0,100% 36%,82% 100%,18% 100%,0 36%);
}
.brand-name{
  writing-mode:vertical-rl;font-weight:800;font-size:17px;letter-spacing:.24em;
}

.burger{
  width:48px;height:48px;padding:0;border:0;border-radius:16px;
  background:var(--ink);display:grid;place-content:center;gap:5px;cursor:pointer;
}
.burger .bar{
  display:block;width:22px;height:3px;border-radius:3px;background:var(--lime);
  transition:transform .25s ease,opacity .2s ease;
}
.burger:focus-visible{outline:3px solid var(--sun);outline-offset:3px}
html.menu-open .burger{background:var(--sun)}
html.menu-open .burger .bar{background:var(--ink)}
html.menu-open .burger .bar:nth-child(1){transform:translateY(8px) rotate(45deg)}
html.menu-open .burger .bar:nth-child(2){opacity:0}
html.menu-open .burger .bar:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

/* 全屏遮罩菜单 */
.menu{
  position:fixed;inset:0;z-index:55;
  display:grid;place-items:center;
  padding:104px 22px 44px;
  background:var(--ink);
  background-image:radial-gradient(rgba(135,255,113,.35) 1.5px,transparent 1.6px);
  background-size:24px 24px;
  clip-path:circle(0% at 52px 88px);
  visibility:hidden;
  transition:clip-path .5s ease,visibility .5s ease;
}
.menu.is-open{clip-path:circle(145% at 52px 88px);visibility:visible}
.menu ol{
  list-style:none;margin:0;padding:0;
  display:grid;gap:6px;counter-reset:m;
  max-height:100%;overflow:auto;
}
.menu li{counter-increment:m}
.menu a{
  display:flex;align-items:center;gap:14px;
  padding:11px 16px;border-radius:18px;
  font-size:clamp(23px,5vw,42px);font-weight:800;letter-spacing:-.02em;
  color:var(--paper);text-decoration:none;
  transition:background .18s ease,color .18s ease;
}
.menu a::before{
  content:counter(m,decimal-leading-zero);
  font-size:13px;font-weight:800;letter-spacing:.1em;
  color:var(--lime);min-width:2.4em;
}
.menu a:hover,.menu a:focus-visible{background:var(--lime);color:var(--ink)}
.menu a:hover::before,.menu a:focus-visible::before{color:var(--ink)}

/* 主体 */
main{
  position:relative;
  max-width:1180px;margin:0 auto;
  padding:78px clamp(16px,4vw,44px) 0;
}
main > div{position:relative;scroll-margin-top:104px}

/* 首屏 */
.hero{
  display:grid;grid-template-columns:1.05fr .95fr;
  gap:clamp(18px,4vw,44px);align-items:center;
  min-height:64vh;padding:8px 0 30px;
  background-image:radial-gradient(rgba(135,255,113,.22) 1.4px,transparent 1.5px);
  background-size:24px 24px;
  background-position:-6px -6px;
}
.hero h1{
  margin:0 0 18px;
  font-size:clamp(34px,6vw,64px);line-height:1.04;
  font-weight:800;letter-spacing:-.03em;
}
.hero-desc{max-width:44ch;color:var(--muted);font-size:17px;margin:0}

.hero-fig{position:relative;margin:0;aspect-ratio:4/5;display:grid;place-items:center}
.hero-shot{
  width:100%;height:100%;border-radius:var(--r);overflow:hidden;
  background:var(--sun);transform:rotate(-2deg);
}
.hero-img{width:100%;height:100%;object-fit:cover}
.hero-blob{
  width:72%;aspect-ratio:1;background:var(--sun);
  clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%);
}
.hero-tile{
  position:absolute;right:-8px;bottom:-14px;
  width:88px;height:88px;background:var(--lime);
  clip-path:polygon(50% 0,100% 100%,0 100%);
  will-change:transform;
}

/* 目录 + 图形 */
.banyan{
  display:grid;grid-template-columns:280px 1fr;
  gap:clamp(16px,3vw,34px);
  margin:4px 0 26px;align-items:start;
}
.toc{
  position:sticky;top:104px;
  background:var(--lime);color:var(--ink);
  border-radius:var(--r);padding:20px 18px 12px;
}
.toc h2{margin:0 0 10px;font-size:20px;font-weight:800;letter-spacing:.08em}
.toc hr{
  border:0;height:2px;margin:0 0 10px;
  background:repeating-linear-gradient(90deg,var(--ink) 0 8px,transparent 8px 16px);
}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:t}
.toc li{counter-increment:t}
.toc a{
  display:flex;align-items:center;gap:10px;
  min-height:40px;padding:6px 0;
  font-size:16px;font-weight:600;text-decoration:none;color:var(--ink);
  border-bottom:1px dotted rgba(25,38,23,.4);
}
.toc a::before{
  content:counter(t,decimal-leading-zero);
  font-size:13px;font-weight:800;opacity:.6;flex:none;
}
.toc a:hover,.toc a:focus-visible{background:var(--sun);border-radius:10px;padding-left:8px}

.banyan-art{
  position:relative;min-height:210px;border-radius:var(--r);
  background:var(--sun);overflow:hidden;will-change:transform;
}
.banyan-art .sq{
  position:absolute;left:13%;top:20%;width:92px;height:92px;
  background:var(--ink);border-radius:12px;transform:rotate(18deg);
}
.banyan-art .tri{
  position:absolute;right:15%;top:16%;width:118px;height:118px;
  background:var(--lime);clip-path:polygon(50% 0,100% 100%,0 100%);
  transform:rotate(-9deg);
}
.banyan-art .cir{
  position:absolute;right:45%;bottom:12%;width:74px;height:74px;
  border-radius:50%;border:6px dotted var(--ink);
}

/* 正文块 */
main > div[id]{
  background:var(--surface);
  border-radius:var(--r);
  padding:clamp(20px,3vw,34px);
  margin-bottom:22px;
  overflow:hidden;
}
main > div[id] h2{
  margin:0 0 14px;font-size:clamp(22px,3vw,30px);line-height:1.28;
  font-weight:800;letter-spacing:-.01em;color:var(--lime);
}
main > div[id] h3{margin:26px 0 10px;font-size:20px;color:var(--sun)}
main > div[id] ul,main > div[id] ol{padding-left:1.3em;margin:0 0 14px}
main > div[id] li{margin-bottom:6px}
main > div[id] a{
  color:var(--sun);text-decoration:underline;
  text-decoration-style:dotted;text-underline-offset:4px;
}
main > div[id] strong{color:var(--lime)}
main > div[id] blockquote{
  margin:18px 0;padding:4px 0 4px 16px;
  border-left:4px solid var(--lime);color:var(--muted);
}
main > div[id] hr{
  border:0;height:2px;margin:18px 0;
  background:repeating-linear-gradient(90deg,var(--lime) 0 8px,transparent 8px 16px);
}
main > div[id] :last-child{margin-bottom:0}

/* 页脚 */
.foot{
  max-width:1180px;margin:42px auto 0;
  padding:38px clamp(16px,4vw,44px) 28px;
  border-top:3px dashed var(--lime);
  display:grid;grid-template-columns:1.35fr 1fr;gap:24px;
}
.mega{
  margin:0;font-size:clamp(46px,10vw,116px);line-height:.88;
  font-weight:800;letter-spacing:-.045em;color:var(--lime);
}
.foot-nav ol{
  list-style:none;margin:0;padding:0;
  display:grid;grid-template-columns:1fr 1fr;gap:0 14px;
}
.foot-nav a{
  display:flex;align-items:center;min-height:40px;padding:4px 0;
  text-decoration:none;font-weight:600;color:var(--paper);
}
.foot-nav a:hover,.foot-nav a:focus-visible{color:var(--sun)}
.foot-base{
  grid-column:1/-1;text-align:center;
  padding-top:20px;border-top:1px dotted rgba(169,195,155,.45);
}
.copy{margin:0 0 4px;color:var(--muted);font-size:16px}
.totop{
  display:inline-flex;align-items:center;min-height:40px;
  padding:0 12px;color:var(--sun);font-weight:600;text-decoration:none;
}

@media (max-width:880px){
  body{padding-left:0}
  .rail{
    flex-direction:row;width:auto;right:0;bottom:auto;height:56px;
    align-items:center;justify-content:space-between;padding:0 12px;
  }
  .rail::after{
    right:0;left:0;top:auto;bottom:0;width:auto;height:3px;
    background:repeating-linear-gradient(90deg,var(--ink) 0 11px,transparent 11px 22px);
  }
  .brand{flex-direction:row;gap:10px}
  .brand-mark{width:28px;height:28px}
  .brand-name{writing-mode:horizontal-tb;letter-spacing:.12em;font-size:17px}
  .strip{left:0;top:56px;height:28px;font-size:13px}
  .menu{padding-top:104px;clip-path:circle(0% at 36px 84px)}
  .menu.is-open{clip-path:circle(160% at 36px 84px)}
  main{padding:96px 16px 0}
  .hero{grid-template-columns:1fr;min-height:0;padding:4px 0 22px}
  .hero-fig{order:2;aspect-ratio:16/11;margin-top:6px}
  .hero-tile{width:64px;height:64px;right:2px;bottom:-10px}
  .banyan{grid-template-columns:1fr}
  .toc{position:static}
  .banyan-art{min-height:130px}
  .banyan-art .sq{width:70px;height:70px}
  .banyan-art .tri{width:88px;height:88px}
  .foot{grid-template-columns:1fr;margin-top:28px}
  .foot-nav ol{grid-template-columns:1fr 1fr}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .strip-run{animation:none}
  .menu{transition:none}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}
</style>

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