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

:root{
  --lime:#80ff00;
  --neon:#00ff00;
  --ink:#1f2617;
  --paper:#f4ffe2;
  --rail:270px;
  --r:10px;
  --soft:0 14px 30px rgba(0,0,0,.28);
}

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

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

body{
  margin:0;
  min-height:100vh;
  font-family:Inter,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.66;
  color:var(--ink);
  background:
    radial-gradient(circle at 88% 6%,rgba(128,255,0,.28),transparent 38%),
    radial-gradient(circle at 12% 92%,rgba(0,255,0,.2),transparent 44%),
    var(--ink);
}

a{color:inherit}
img{max-width:100%}

.skip{
  position:absolute;
  width:1px;height:1px;
  overflow:hidden;
  clip-path:inset(50%);
}

/* ---------- 左侧轨道 ---------- */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail);
  display:flex;
  flex-direction:column;
  gap:16px;
  padding:22px 18px;
  background:var(--lime);
  border-right:3px solid var(--ink);
  overflow-y:auto;
  z-index:40;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:48px;
  padding:4px 6px;
  text-decoration:none;
  font-weight:800;
  font-size:26px;
  letter-spacing:-.03em;
  line-height:1;
  transform:rotate(-1.6deg);
}

.brand .logo-mark{
  width:42px;height:42px;
  border:3px solid var(--ink);
  border-radius:var(--r);
  background:var(--paper);
  object-fit:cover;
}

.brand-txt{
  background:var(--ink);
  color:var(--neon);
  padding:4px 8px 6px;
  border-radius:var(--r);
}

/* 折叠菜单：details > summary + menu > li > a */
.menu-wrap summary{
  display:flex;
  align-items:center;
  gap:8px;
  min-height:46px;
  padding:0 12px;
  border:3px solid var(--ink);
  border-radius:var(--r);
  background:var(--paper);
  font-weight:800;
  font-size:16px;
  letter-spacing:.06em;
  cursor:pointer;
  list-style:none;
  box-shadow:5px 5px 0 var(--ink);
  transition:transform .15s ease,background .15s ease,color .15s ease;
}
.menu-wrap summary::-webkit-details-marker{display:none}
.menu-wrap summary svg{width:17px;height:17px;flex:none}
.menu-wrap summary:hover{transform:translate(-1px,-1px) rotate(-1deg)}
.menu-wrap[open] summary{background:var(--ink);color:var(--neon)}

.menu-wrap menu{
  list-style:none;
  margin:12px 0 0;
  padding:0;
  display:grid;
  gap:8px;
}

.menu-wrap menu a{
  display:flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:7px 11px;
  border:2px solid var(--ink);
  border-radius:var(--r);
  background:rgba(244,255,226,.82);
  font-weight:700;
  font-size:16px;
  line-height:1.3;
  text-decoration:none;
  transition:background .15s ease,color .15s ease,transform .15s ease;
}

.menu-wrap .blip{width:12px;height:12px;flex:none;opacity:.75}

.menu-wrap menu a:hover,
.menu-wrap menu a:focus-visible{
  background:var(--ink);
  color:var(--neon);
  transform:translateX(4px) rotate(-1deg);
}

.search{display:flex}
.search input{
  width:100%;
  min-height:44px;
  padding:8px 12px;
  font-family:inherit;
  font-size:16px;
  color:var(--ink);
  background:var(--paper);
  border:3px dashed var(--ink);
  border-radius:var(--r);
}
.search input::placeholder{color:rgba(31,38,23,.62)}
.search input:focus-visible{outline:3px solid var(--neon);outline-offset:2px}

/* ---------- 舞台 ---------- */
.stage{
  margin-left:var(--rail);
  display:grid;
  grid-template-columns:minmax(0,1fr) 292px;
  gap:26px;
  align-items:start;
  padding:26px clamp(16px,3vw,42px) 64px;
}

.sheet{
  min-width:0;
  background:var(--paper);
  border:4px solid var(--ink);
  border-radius:var(--r);
  box-shadow:12px 12px 0 rgba(128,255,0,.55),var(--soft);
  overflow:hidden;
}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:16px;
  min-height:70vh;
  padding:52px 24px 56px;
  text-align:center;
  color:var(--paper);
  background:
    radial-gradient(circle at 24% 16%,rgba(0,255,0,.5),transparent 44%),
    radial-gradient(circle at 78% 82%,rgba(128,255,0,.55),transparent 46%),
    var(--ink);
  border-bottom:3px solid var(--ink);
}

.sticker{
  width:104px;height:104px;
  transform:rotate(-9deg);
  filter:drop-shadow(5px 6px 0 rgba(0,0,0,.35));
  animation:jitter 4.5s ease-in-out infinite;
}

.hero h1{
  margin:0;
  max-width:15ch;
  font-size:clamp(34px,6.2vw,70px);
  font-weight:800;
  line-height:1.03;
  letter-spacing:-.035em;
  color:var(--neon);
  text-shadow:4px 4px 0 rgba(0,0,0,.45);
}

.lede{
  margin:0;
  max-width:44ch;
  font-size:17px;
  font-weight:600;
  line-height:1.6;
  color:#e8ffcb;
}

.cta{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:10px 26px;
  margin-top:4px;
  font-weight:800;
  font-size:17px;
  letter-spacing:.06em;
  text-decoration:none;
  color:var(--ink);
  background:var(--lime);
  border:3px solid var(--ink);
  border-radius:var(--r);
  box-shadow:5px 5px 0 rgba(0,0,0,.5);
  transition:transform .16s ease,background .16s ease;
}
.cta:hover,.cta:focus-visible{transform:translate(-2px,-3px) rotate(-2deg);background:var(--neon)}

/* ---------- 正文区 ---------- */
.sheet > article{
  padding:clamp(22px,3vw,36px);
  scroll-margin-top:96px;
  border-bottom:3px dashed rgba(31,38,23,.32);
}
.sheet > article:last-child{border-bottom:0}

.sheet h2{
  margin:0 0 8px;
  font-size:clamp(23px,3.3vw,36px);
  font-weight:800;
  line-height:1.16;
  letter-spacing:-.02em;
  transform:rotate(-.7deg);
}
.sheet h3{
  margin:26px 0 6px;
  font-size:clamp(19px,2.2vw,23px);
  font-weight:800;
  line-height:1.3;
}

hr{
  border:0;
  height:9px;
  margin:6px 0 20px;
  background:repeating-linear-gradient(90deg,var(--ink) 0 13px,transparent 13px 22px);
  opacity:.85;
}

.sheet p{margin:0 0 15px}
.sheet ul,.sheet ol{margin:0 0 16px;padding-left:22px}
.sheet li{margin:0 0 7px}
.sheet strong{background:var(--neon);padding:0 3px}
.sheet a{color:var(--ink);text-decoration-thickness:3px;text-underline-offset:3px}
.sheet a:hover{background:var(--lime)}
.sheet img{
  border:3px solid var(--ink);
  border-radius:var(--r);
  height:auto;
  filter:saturate(1.15);
}
.sheet blockquote{
  margin:0 0 16px;
  padding:12px 16px;
  background:rgba(0,255,0,.22);
  border-left:6px solid var(--ink);
  border-radius:0 var(--r) var(--r) 0;
  font-weight:600;
}
.sheet code{
  font-size:15px;
  background:rgba(31,38,23,.12);
  padding:1px 5px;
  border-radius:5px;
}
.sheet table{width:100%;border-collapse:collapse;margin:0 0 16px;font-size:16px}
.sheet th,.sheet td{border:2px solid var(--ink);padding:8px 10px;text-align:left}

/* ---------- 侧栏 ---------- */
.jump{
  position:sticky;
  top:26px;
  padding:16px 16px 20px;
  background:var(--neon);
  border:3px solid var(--ink);
  border-radius:var(--r);
  box-shadow:7px 7px 0 rgba(31,38,23,.85);
  transform:rotate(1.4deg);
}

.jump h2{
  margin:0;
  font-size:21px;
  font-weight:800;
  letter-spacing:.05em;
}
.jump hr{height:6px;margin:8px 0 14px;background:var(--ink);opacity:1}
.jump ul{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.jump a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:6px 4px;
  font-weight:700;
  font-size:16px;
  text-decoration:none;
  border-bottom:2px dotted rgba(31,38,23,.55);
}
.jump a:hover,.jump a:focus-visible{background:var(--ink);color:var(--neon)}

.peel{
  margin:18px 0 0;
  padding:5px 10px;
  display:inline-block;
  font-size:15px;
  font-weight:800;
  letter-spacing:.14em;
  color:var(--neon);
  background:var(--ink);
  border-radius:var(--r);
  transform:rotate(-6deg);
}

/* ---------- 页脚 ---------- */
.base{
  margin-left:var(--rail);
  padding:22px clamp(16px,3vw,42px) 30px;
  background:var(--lime);
  border-top:4px solid var(--ink);
  text-align:center;
  overflow:hidden;
}

.tape{
  display:flex;
  gap:0;
  white-space:nowrap;
  overflow:hidden;
  font-weight:800;
  font-size:15px;
  letter-spacing:.18em;
  padding:5px 0;
  margin-bottom:14px;
  border-top:3px solid var(--ink);
  border-bottom:3px solid var(--ink);
}
.tape span{animation:slide 22s linear infinite}

.mega{
  margin:0 0 4px;
  font-size:clamp(44px,12.5vw,128px);
  font-weight:800;
  line-height:.88;
  letter-spacing:-.055em;
  transform:rotate(-1.8deg);
}

.cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:12px;
  max-width:720px;
  margin:20px auto 18px;
  text-align:left;
}

.cols dt{
  display:inline-block;
  margin-bottom:6px;
  padding:2px 8px;
  font-size:15px;
  font-weight:800;
  letter-spacing:.1em;
  color:var(--lime);
  background:var(--ink);
  border-radius:var(--r);
}
.cols dd{margin:0}
.cols a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:2px 0;
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  border-bottom:2px dotted rgba(31,38,23,.55);
}
.cols a:hover,.cols a:focus-visible{background:var(--ink);color:var(--neon)}

.copy{
  margin:0;
  font-size:16px;
  font-weight:700;
  letter-spacing:.04em;
}

/* ---------- 动效 ---------- */
@keyframes jitter{
  0%,100%{transform:rotate(-9deg) translateY(0)}
  35%{transform:rotate(-4deg) translateY(-6px)}
  70%{transform:rotate(-12deg) translateY(3px)}
}
@keyframes slide{
  from{transform:translateX(0)}
  to{transform:translateX(-100%)}
}

.rv{opacity:0;transform:translateY(20px)}
.rv.in{opacity:1;transform:none;transition:opacity .55s ease,transform .55s ease}

:focus-visible{outline:3px solid var(--ink);outline-offset:3px}

/* ---------- 窄屏 ---------- */
@media (max-width:1100px){
  .stage{grid-template-columns:minmax(0,1fr) 250px;gap:18px}
}

@media (max-width:899px){
  .rail{
    position:sticky;
    top:0;
    inset:auto;
    width:auto;
    flex-direction:row;
    flex-wrap:wrap;
    align-items:center;
    gap:10px;
    padding:10px 14px;
    border-right:0;
    border-bottom:3px solid var(--ink);
    overflow:visible;
  }
  .brand{font-size:21px;min-height:44px;transform:none;padding:0}
  .brand .logo-mark{width:34px;height:34px}
  .menu-wrap{flex:1 1 auto;min-width:120px}
  .menu-wrap summary{min-height:44px}
  .search{flex:1 1 100%;order:3}
  .stage{margin-left:0;grid-template-columns:minmax(0,1fr);padding:16px 14px 48px;gap:20px}
  .hero{min-height:58vh;padding:34px 18px 38px}
  .sticker{width:82px;height:82px}
  .jump{position:static;transform:none;order:2}
  .base{margin-left:0}
  .cols{gap:8px}
  .cols dt{font-size:14px;letter-spacing:.06em}
  .cols a{font-size:15px;min-height:42px}
}

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

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