:root{
  --neon:#87ff71;
  --mustard:#ffce5c;
  --ink:#192617;
  --paper:#f5f8ef;
  --dot:rgba(25,38,23,.14);
  --bar:78px;
  --serif:"Noto Serif JP","Songti SC","SimSun",serif;
  --sans:"Noto Sans JP","Hiragino Sans","PingFang SC","Microsoft YaHei",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  padding-bottom:calc(var(--bar) + 10px);
  background:var(--paper);
  background-image:radial-gradient(var(--dot) 1.4px,transparent 1.4px);
  background-size:20px 20px;
  color:var(--ink);
  font:400 17px/1.72 var(--sans);
  overflow-x:hidden;
}
img{max-width:100%}
a{color:var(--ink)}
:focus-visible{outline:3px dashed var(--ink);outline-offset:3px}
.board{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.dot{position:absolute;display:block;opacity:.5}
.dot-a{width:220px;height:220px;left:-90px;top:32%;background:var(--neon);clip-path:polygon(50% 0,100% 100%,0 100%);transform:rotate(18deg)}
.dot-b{width:150px;height:150px;right:-60px;top:58%;background:var(--mustard);clip-path:circle(50% at 50% 50%)}
.dot-c{width:120px;height:120px;right:14%;top:12%;border:4px dotted var(--ink);opacity:.28;transform:rotate(9deg)}

/* ---------- 底部固定条 + 全屏遮罩菜单 ---------- */
.nav{
  position:fixed;left:0;right:0;bottom:0;z-index:60;
  height:var(--bar);display:flex;align-items:center;justify-content:space-between;
  padding:0 14px;background:var(--ink);border-top:3px dashed var(--neon);
}
.brand{
  position:relative;z-index:75;display:inline-flex;align-items:center;gap:10px;
  min-height:50px;padding:0 10px 0 2px;text-decoration:none;
  color:var(--neon);font-family:var(--serif);font-weight:700;font-size:18px;letter-spacing:.06em;
}
.brand-mark{width:24px;height:24px;background:var(--neon);clip-path:polygon(50% 0,100% 100%,0 100%);flex:none}
.nav-toggle{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.nav-btn{
  position:relative;z-index:75;width:54px;height:54px;flex:none;
  display:grid;place-items:center;cursor:pointer;
  background:var(--mustard);color:var(--ink);
  clip-path:polygon(0 0,100% 0,100% 82%,82% 100%,0 100%);
}
.nav-btn i{position:relative;display:block;width:24px;height:2px;background:currentColor;box-shadow:0 -7px 0 currentColor,0 7px 0 currentColor;transition:transform .25s,box-shadow .25s}
.nav-toggle:checked ~ .nav-btn i{transform:rotate(45deg);box-shadow:0 0 0 currentColor,0 0 0 currentColor}
.nav-toggle:checked ~ .nav-btn i::after{content:"";position:absolute;inset:0;background:currentColor;transform:rotate(90deg)}
.nav ol{
  position:fixed;inset:0;z-index:70;margin:0;list-style:none;
  padding:calc(var(--bar) + 22px) 20px calc(var(--bar) + 22px);
  background:var(--ink);background-image:radial-gradient(rgba(135,255,113,.16) 1.4px,transparent 1.4px);background-size:22px 22px;
  display:grid;align-content:center;gap:2px;counter-reset:nv;
  opacity:0;visibility:hidden;transform:translateY(104%);
  transition:transform .42s cubic-bezier(.2,.85,.25,1),opacity .3s,visibility .3s;
  overflow-y:auto;
}
.nav-toggle:checked ~ ol{opacity:1;visibility:visible;transform:none}
.nav ol a{
  display:flex;align-items:center;gap:14px;min-height:54px;padding:6px 6px;
  color:var(--paper);text-decoration:none;font-family:var(--serif);font-size:20px;font-weight:600;
  border-bottom:1px dotted rgba(135,255,113,.45);counter-increment:nv;
  transition:padding-left .2s,color .2s,background .2s;
}
.nav ol a::before{content:counter(nv,decimal-leading-zero);font-family:var(--sans);font-size:12px;font-weight:700;letter-spacing:.12em;color:var(--neon)}
.nav ol a:hover,.nav ol a:focus-visible{color:var(--neon);padding-left:18px;background:rgba(135,255,113,.1)}

/* ---------- 主体 ---------- */
.wrap{position:relative;z-index:1;width:100%;max-width:1140px;margin:0 auto;padding:0 18px 64px}

.hero{
  position:relative;min-height:100svh;overflow:hidden;
  display:grid;grid-template-columns:1fr;align-content:center;gap:30px;
  padding:76px 0 54px;
}
.bgword{
  position:absolute;right:-10px;bottom:16px;z-index:0;pointer-events:none;user-select:none;
  font-family:var(--serif);font-weight:700;font-size:clamp(74px,17vw,208px);line-height:.78;letter-spacing:-.05em;
  color:rgba(135,255,113,.45);mix-blend-mode:multiply;
}
.shapes{position:absolute;inset:0;z-index:1;pointer-events:none;overflow:hidden}
.sh{position:absolute;display:block}
.sh-a{width:118px;height:118px;left:-26px;top:14%;background:var(--mustard);clip-path:polygon(50% 0,100% 100%,0 100%);transform:rotate(12deg)}
.sh-b{width:88px;height:88px;right:7%;top:7%;background:var(--neon);clip-path:circle(50% at 50% 50%)}
.sh-c{width:150px;height:24px;left:10%;bottom:12%;background:repeating-linear-gradient(90deg,var(--ink) 0 6px,transparent 6px 15px)}
.sh-d{width:62px;height:62px;right:36%;bottom:22%;border:3px dashed var(--ink);transform:rotate(-9deg)}

.collage{position:relative;z-index:2;height:min(64vw,400px);margin:0}
.shot{margin:0;position:absolute;overflow:hidden;box-shadow:9px 9px 0 var(--ink);background:var(--mustard)}
.shot img{display:block;width:100%;height:100%;object-fit:cover}
.shot-a{width:64%;height:72%;left:0;top:0;transform:rotate(-6deg);clip-path:polygon(0 0,100% 0,100% 86%,86% 100%,0 100%)}
.shot-b{width:50%;height:56%;right:2%;bottom:0;transform:rotate(5deg);background:var(--neon);clip-path:polygon(14% 0,100% 0,100% 100%,0 100%)}
.shot-fill{display:block;width:100%;height:100%;background:repeating-linear-gradient(45deg,var(--neon) 0 12px,var(--mustard) 12px 24px)}

.hero-inner{position:relative;z-index:3;text-align:right}
.eyebrow{
  display:inline-block;margin:0 0 16px;padding:5px 13px;
  background:var(--neon);color:var(--ink);font-size:15px;font-weight:700;letter-spacing:.14em;
  transform:rotate(-1.6deg);
}
.hero h1{font-family:var(--serif);font-weight:700;font-size:clamp(31px,7.2vw,58px);line-height:1.16;margin:0 0 16px;letter-spacing:.005em}
.hero-sub{margin:0 0 16px;font-size:18px;font-weight:600}
.hero-sub span{display:inline-block;padding:2px 11px;background:var(--mustard);transform:rotate(1.2deg)}
.hero-lede{margin:0 0 0 auto;max-width:30em;font-size:17px;color:rgba(25,38,23,.84)}

/* ---------- 正文 + 侧栏 ---------- */
.stage{display:grid;grid-template-columns:minmax(0,1fr);gap:36px;padding-top:10px}
.body{min-width:0}
.body div{padding:36px 0;border-top:2px dashed rgba(25,38,23,.3);scroll-margin-top:26px}
.body div:first-child{border-top:0;padding-top:6px}
.body h2{font-family:var(--serif);font-weight:700;font-size:clamp(23px,3.6vw,32px);line-height:1.32;margin:0 0 16px}
.body h2 span{box-shadow:inset 0 -13px 0 var(--mustard);padding-bottom:2px}
.body h3{font-family:var(--serif);font-size:20px;line-height:1.4;margin:26px 0 10px}
.body h3 span{box-shadow:inset 0 -10px 0 var(--neon)}
.body p{margin:0 0 15px;max-width:44em}
.body ul,.body ol{margin:0 0 16px;padding-left:1.3em;max-width:44em}
.body li{margin:0 0 8px}
.body a{color:#1d4f27;text-decoration:none;border-bottom:2px dotted var(--mustard)}
.body a:hover{background:var(--mustard)}
.body strong{background:rgba(135,255,113,.6);padding:0 3px}
.body blockquote{
  margin:0 0 18px;padding:16px 18px;background:var(--neon);
  border-left:8px solid var(--ink);font-family:var(--serif);font-size:17px;
}
.body blockquote p:last-child{margin:0}
.body table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:16px}
.body th,.body td{border-bottom:2px dotted rgba(25,38,23,.32);padding:10px 8px;text-align:left;vertical-align:top}
.body th{background:var(--mustard)}

.side{
  align-self:start;display:grid;gap:14px;
  background:var(--mustard);padding:22px 18px;transform:rotate(-.7deg);
  box-shadow:7px 7px 0 var(--ink);
}
.side-t{font-family:var(--serif);font-size:19px;margin:0;line-height:1.4}
.side-t span{display:inline-block;background:var(--ink);color:var(--neon);padding:3px 11px}
.side-nav{list-style:none;margin:0;padding:0;display:grid;counter-reset:sn}
.side-nav a{
  display:flex;align-items:center;gap:10px;min-height:44px;padding:4px 2px;
  font-size:16px;text-decoration:none;color:var(--ink);
  border-bottom:2px dotted rgba(25,38,23,.34);counter-increment:sn;
  transition:padding-left .18s,color .18s;
}
.side-nav a::before{content:counter(sn,decimal-leading-zero);font-size:12px;font-weight:700;letter-spacing:.1em;color:#3c5c1e}
.side-nav a:hover{padding-left:10px;color:#123a1a}
.side-tips{margin:0;padding-left:1.15em;font-size:16px}
.side-tips li{margin:0 0 8px;line-height:1.6}

/* ---------- 页脚 ---------- */
.foot{
  position:relative;z-index:1;margin-top:20px;padding:44px 18px 0;
  background:var(--ink);color:var(--paper);border-top:8px solid var(--neon);
}
.foot-grid{max-width:1140px;margin:0 auto;display:grid;grid-template-columns:1fr;gap:26px;padding-bottom:28px}
.foot-brand p{margin:0;font-size:16px;line-height:1.65;color:rgba(245,248,239,.82);max-width:26em}
.foot-logo{
  display:inline-flex;align-items:center;min-height:44px;margin-bottom:8px;
  font-family:var(--serif);font-size:19px;font-weight:700;color:var(--neon);
  text-decoration:none;letter-spacing:.06em;
  border-bottom:3px dotted rgba(135,255,113,.5);
}
.foot dl{margin:0}
.foot dt{font-family:var(--serif);font-size:16px;color:var(--mustard);letter-spacing:.1em;margin-bottom:8px}
.foot dd{margin:0;font-size:16px;line-height:1.6;color:rgba(245,248,239,.82)}
.foot dd a{
  display:inline-flex;align-items:center;min-height:40px;color:var(--paper);
  text-decoration:none;border-bottom:1px dotted rgba(255,206,92,.55);
}
.foot dd a:hover{color:var(--mustard);background:rgba(135,255,113,.12)}
.copy{
  max-width:1140px;margin:0 auto;padding:16px 0 26px;font-size:15px;
  color:rgba(245,248,239,.7);border-top:1px dotted rgba(245,248,239,.32);
}

/* ---------- 断点 ---------- */
@media (min-width:560px){
  .foot-grid{grid-template-columns:1fr 1fr}
  .foot-brand{grid-column:1 / -1}
}
@media (min-width:760px){
  .nav ol{padding-left:34px;padding-right:34px}
  .nav ol a{font-size:22px;min-height:58px}
  .nav ol a::before{font-size:13px}
  .brand{font-size:19px}
  .hero{padding:96px 0 64px}
}
@media (min-width:900px){
  .hero{grid-template-columns:0.92fr 1fr;align-items:center;gap:34px}
  .collage{order:1}
  .hero-inner{order:2}
  .bgword{right:0;bottom:30px}
}
@media (min-width:960px){
  .stage{grid-template-columns:minmax(0,1fr) 296px;gap:46px}
  .side{position:sticky;top:24px}
  .foot-grid{grid-template-columns:1.35fr 1fr 1fr 1fr}
  .foot-brand{grid-column:auto}
}
@media (min-width:1100px){
  .hero h1{font-size:60px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}

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