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

:root{
  --banana:#F5C518;
  --banana-dark:#E0B00F;
  --ink:#141414;
  --cream:#F4F1E8;
  --paper:#FFFDF3;
  --muted:#57523F;
  --r:28px;
  --barh:56px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--cream);
  color:var(--ink);
  font-family:Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.7;
  font-weight:400;
  overflow-x:hidden;
}
h1,h2,h3,h4{margin:0 0 .5em;line-height:1.25;font-weight:600;letter-spacing:-.01em}
p{margin:0 0 1em}
a{color:var(--ink)}
img{max-width:100%}
svg{display:block}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
[id]{scroll-margin-top:calc(var(--barh) + 18px)}

/* ---------- 顶栏 ---------- */
.top{background:var(--ink);color:var(--cream);border-bottom:6px solid var(--banana)}
.top-in{
  max-width:1180px;margin:0 auto;padding:10px 18px;
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
}
.brand{
  display:inline-flex;align-items:center;gap:10px;
  color:var(--cream);text-decoration:none;font-weight:600;font-size:18px;
  letter-spacing:.02em;padding:6px 0;min-height:44px;
}
.brand .mark,.foot-logo .mark{
  width:32px;height:32px;border-radius:4px;background:var(--banana);color:var(--ink);
  display:grid;place-items:center;font-size:17px;font-weight:600;flex:0 0 auto;
}
.logo{width:32px;height:32px;object-fit:contain;border-radius:4px;background:var(--banana);flex:0 0 auto}
.brand-t{white-space:nowrap}

.topnav{margin-left:auto;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.navlinks{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none;flex-wrap:wrap}
.navlinks a{
  display:inline-flex;align-items:center;min-height:40px;padding:9px 11px;
  color:var(--cream);text-decoration:none;font-size:16px;font-weight:500;
  border-radius:999px;transition:background .15s ease,color .15s ease;
}
.navlinks a:hover{background:var(--banana);color:var(--ink)}

.drop{position:relative}
.drop summary{
  list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:7px;
  min-height:40px;padding:9px 13px;font-size:16px;font-weight:500;color:var(--cream);
  border:2px solid var(--cream);border-radius:999px;
  transition:background .15s ease,color .15s ease,border-color .15s ease;
}
.drop summary::-webkit-details-marker{display:none}
.drop summary::after{content:"+";font-weight:600;line-height:1}
.drop[open] summary{background:var(--banana);border-color:var(--banana);color:var(--ink)}
.drop ul{
  position:absolute;right:0;top:calc(100% + 8px);z-index:40;
  margin:0;padding:8px;list-style:none;min-width:196px;
  background:var(--ink);border:2px solid var(--banana);border-radius:10px;
}
.drop ul a{
  display:flex;align-items:center;min-height:40px;padding:9px 12px;
  color:var(--cream);text-decoration:none;font-size:16px;border-radius:4px;
}
.drop ul a:hover{background:var(--banana);color:var(--ink)}

.contact{
  display:inline-flex;align-items:center;min-height:40px;padding:9px 16px;
  background:var(--banana);color:var(--ink);text-decoration:none;
  font-size:16px;font-weight:600;border-radius:999px;
  transition:background .15s ease;
}
.contact:hover{background:var(--cream)}

/* ---------- 粘性锚点条 ---------- */
.anchors{position:sticky;top:0;z-index:30;background:var(--cream);border-bottom:2px solid var(--ink)}
.anchors-in{
  max-width:1180px;margin:0 auto;padding:9px 14px;
  display:flex;gap:8px;overflow-x:auto;overscroll-behavior-x:contain;
}
.anchors a{
  flex:0 0 auto;display:inline-flex;align-items:center;min-height:40px;
  padding:8px 15px;font-size:16px;font-weight:500;text-decoration:none;
  background:var(--paper);border:2px solid var(--ink);border-radius:999px;
  transition:background .15s ease;
}
.anchors a:hover{background:var(--banana)}

/* ---------- 布局 ---------- */
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}
main{padding-bottom:8px}

.hero{
  position:relative;overflow:hidden;
  background:var(--banana);border:2px solid var(--ink);border-radius:var(--r);
  padding:34px 26px 38px;margin:22px 0 4px;min-height:45vh;
  display:flex;align-items:center;gap:24px;justify-content:space-between;
}
.hero-txt{position:relative;z-index:2;max-width:640px}
.hero-h{font-size:clamp(30px,4.8vw,54px);font-weight:600;letter-spacing:-.02em;line-height:1.1}
.hero-desc{font-size:17px;max-width:52ch;color:#26220f;margin-bottom:18px}
.hero-cta{display:flex;flex-wrap:wrap;gap:10px;margin:0}
.btn{
  display:inline-flex;align-items:center;min-height:44px;padding:11px 20px;
  background:var(--ink);color:var(--cream);text-decoration:none;
  font-size:16px;font-weight:600;border:2px solid var(--ink);border-radius:999px;
  transition:background .15s ease,color .15s ease;
}
.btn:hover{background:var(--paper);color:var(--ink)}
.btn-ghost{background:transparent;color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:var(--cream)}
.hero-art{width:132px;height:132px;flex:0 0 auto;position:relative;z-index:2}
.hero-num{
  position:absolute;right:10px;bottom:-34px;z-index:1;
  font-size:180px;font-weight:600;line-height:1;color:var(--banana-dark);
  letter-spacing:-.05em;pointer-events:none;
}

.shell{
  display:grid;grid-template-columns:264px minmax(0,1fr);gap:26px;
  align-items:start;padding:26px 0 0;
}

/* ---------- 侧栏 ---------- */
.side{
  position:sticky;top:calc(var(--barh) + 14px);
  background:var(--paper);border:2px solid var(--ink);
  border-bottom:10px solid var(--banana);border-radius:var(--r);
  padding:16px 14px 20px;
}
.side-h{font-size:19px;margin-bottom:10px}
.side-h span{
  display:inline-block;background:var(--banana);padding:1px 9px;border-radius:4px;
}
.side-list{list-style:none;margin:0;padding:0;counter-reset:none}
.side-list li{margin:0}
.side-list a{
  display:flex;align-items:center;gap:9px;min-height:40px;padding:7px 4px;
  text-decoration:none;font-size:16px;border-bottom:1px solid #ded8c4;
  transition:background .15s ease;
}
.side-list li:last-child a{border-bottom:0}
.side-list a:hover{background:var(--banana)}
.side-list .num{
  font-size:13px;font-weight:600;color:var(--muted);letter-spacing:.06em;
  flex:0 0 auto;min-width:20px;
}

/* ---------- 正文 ---------- */
.body{min-width:0}
div{padding-bottom:12px}
div section{
  background:var(--paper);border:2px solid var(--ink);
  border-bottom:10px solid var(--banana);border-radius:var(--r);
  padding:24px 22px 18px;margin:0 0 26px;
}
div h2{font-size:clamp(22px,3vw,29px);margin-bottom:.6em}
div h2 span{display:inline-block;background:var(--banana);padding:0 9px;border-radius:4px}
div h3{font-size:20px;margin-bottom:.55em}
div h3 span{border-bottom:4px solid var(--banana);padding-bottom:1px}
div h4{font-size:17px}
div p,div li{font-size:17px}
div ul,div ol{padding-left:1.35em;margin:0 0 1em}
div li{margin:.4em 0}
div a{
  text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px;
  transition:background .15s ease;
}
div a:hover{background:var(--banana)}
div img{border:2px solid var(--ink);border-radius:16px;margin:.6em 0}
div blockquote{
  margin:0 0 1em;padding:12px 16px;background:#fff;
  border-left:9px solid var(--banana);border-radius:4px;
}
div blockquote p:last-child{margin:0}
div table{width:100%;border-collapse:collapse;font-size:16px;margin:0 0 1em}
div th,div td{border:2px solid var(--ink);padding:9px 11px;text-align:left}
div th{background:var(--banana)}
div code{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:15px;background:#EAE3CE;padding:1px 5px;border-radius:4px;
}
div hr{border:0;border-top:2px solid var(--ink);margin:1.4em 0}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:46px;background:var(--ink);color:var(--cream);
  border-top:10px solid var(--banana);padding:34px 18px 0;
}
.foot-in{max-width:1180px;margin:0 auto}
.foot-grid{display:grid;grid-template-columns:1.1fr 2fr;gap:30px;align-items:start}
.foot-logo{
  display:inline-flex;align-items:center;gap:10px;color:var(--cream);
  text-decoration:none;font-size:18px;font-weight:600;min-height:44px;
}
.sub{display:flex;gap:8px;margin:14px 0 0;flex-wrap:wrap}
.sub input{
  flex:1 1 150px;min-width:0;font:inherit;font-size:16px;
  padding:11px 12px;border:2px solid var(--cream);border-radius:4px;
  background:transparent;color:var(--cream);
}
.sub input::placeholder{color:#B3AE9F}
.sub button{
  font:inherit;font-size:16px;font-weight:600;cursor:pointer;
  padding:11px 20px;min-height:44px;border:2px solid var(--banana);
  background:var(--banana);color:var(--ink);border-radius:4px;
  transition:background .15s ease;
}
.sub button:hover{background:var(--cream);border-color:var(--cream)}
.foot-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.foot-nav dl{margin:0;min-width:0}
.foot-nav dt{
  font-size:16px;font-weight:600;color:var(--banana);
  letter-spacing:.08em;margin-bottom:4px;
}
.foot-nav dd{margin:0}
.foot-nav a{
  display:inline-flex;align-items:center;min-height:40px;padding:7px 0;
  color:var(--cream);text-decoration:none;font-size:16px;
  transition:color .15s ease;
}
.foot-nav a:hover{color:var(--banana)}
.foot-bottom{
  display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;
  border-top:2px solid #363228;margin-top:26px;padding:12px 0 26px;
}
.copy{margin:0;font-size:16px;color:#C9C4B4}
.totop{
  display:inline-flex;align-items:center;min-height:40px;padding:8px 16px;
  font-size:16px;color:var(--ink);background:var(--banana);
  border-radius:999px;text-decoration:none;
}
.totop:hover{background:var(--cream)}

/* ---------- 进场动效 ---------- */
.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .45s ease,transform .45s ease}
.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .reveal{opacity:1;transform:none;transition:none}
}

/* ---------- 移动端 ---------- */
@media (max-width:820px){
  body{font-size:17px}
  .top-in{padding:9px 14px;gap:8px}
  .brand{font-size:17px}
  .brand-t{white-space:normal}
  .topnav{order:3;width:100%;margin-left:0;gap:6px}
  .contact{order:2;margin-left:auto;min-height:40px;padding:9px 14px}
  .navlinks{gap:4px}
  .navlinks a{padding:8px 10px}
  .drop ul{left:0;right:auto}
  .hero{flex-direction:column;align-items:flex-start;gap:14px;padding:24px 18px 30px;min-height:0;margin-top:16px}
  .hero-art{width:96px;height:96px}
  .hero-num{font-size:118px;bottom:-20px;right:2px}
  .hero-desc{font-size:17px}
  .shell{grid-template-columns:1fr;gap:20px;padding-top:20px}
  .side{position:static}
  .side-list{display:grid;grid-template-columns:1fr 1fr;gap:0 12px}
  .side-list a{border-bottom:1px solid #DED8C4}
  div section{padding:20px 16px 14px;border-bottom-width:8px}
  .foot-grid{grid-template-columns:1fr;gap:22px}
  .foot-nav{gap:12px}
  .wrap{padding:0 14px}
}
@media (max-width:420px){
  .side-list{grid-template-columns:1fr}
  .foot-nav{grid-template-columns:1fr 1fr}
  .hero-h{font-size:30px}
}

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