:root{
  --mint:#b4fde1;
  --blue:#add8e6;
  --ink:#172620;
  --paper:#f2fbf6;
  --clay:#ffffff;
  --soft:#e7fbf3;
  --line:rgba(23,38,32,.16);
  --r-lg:28px;
  --r-md:16px;
  --lift:inset -3px -3px 0 rgba(23,38,32,.12), 4px 4px 0 var(--ink);
  --lift-soft:inset -3px -3px 0 rgba(23,38,32,.09), 0 10px 22px rgba(23,38,32,.12);
}

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

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

body{
  margin:0;
  font-family:Inter,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.72;
  color:var(--ink);
  background-color:var(--paper);
  background-image:radial-gradient(rgba(23,38,32,.13) 1.6px, transparent 1.6px);
  background-size:19px 19px;
  background-position:0 0;
  overflow-x:hidden;
}

body.lock{overflow:hidden}

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

a{color:var(--ink)}

h1,h2,h3{letter-spacing:-.015em}

/* ---------- 顶部 ---------- */

.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
  max-width:1240px;
  margin:0 auto;
  padding:16px clamp(14px,4vw,40px) 12px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:48px;
  padding:5px 18px 5px 6px;
  text-decoration:none;
  background:var(--clay);
  border:3px solid var(--ink);
  border-radius:999px;
  box-shadow:var(--lift);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1), box-shadow .2s ease-out;
}

.brand:active{transform:translate(3px,3px);box-shadow:inset -3px -3px 0 rgba(23,38,32,.12),0 0 0 var(--ink)}

.brand-mark{
  width:34px;height:34px;
  display:grid;place-items:center;
  border-radius:50%;
  border:3px solid var(--ink);
  background:linear-gradient(140deg,var(--mint),var(--blue));
  font-weight:800;
  line-height:1;
}

.brand-name{font-weight:800;letter-spacing:.04em}

.tools{display:flex;align-items:center;gap:10px;flex-wrap:wrap}

.search{display:block}

.search input{
  height:46px;
  width:clamp(118px,26vw,220px);
  padding:0 16px;
  font:inherit;
  font-size:16px;
  color:var(--ink);
  background:#fff;
  border:3px solid var(--ink);
  border-radius:999px;
  box-shadow:inset -3px -3px 0 rgba(23,38,32,.1);
}

.search input::placeholder{color:rgba(23,38,32,.55)}

.search input:focus{outline:3px solid var(--blue);outline-offset:2px}

.burger{
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:0 20px;
  font:inherit;
  font-weight:700;
  color:var(--ink);
  cursor:pointer;
  background:var(--mint);
  border:3px solid var(--ink);
  border-radius:999px;
  box-shadow:var(--lift);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1), box-shadow .2s ease-out;
}

.burger:hover{background:#c9ffed}

.burger:active{transform:translate(3px,3px);box-shadow:inset -3px -3px 0 rgba(23,38,32,.12),0 0 0 var(--ink)}

/* ---------- 粘性锚点条 ---------- */

.anchors{
  position:sticky;
  top:0;
  z-index:40;
  background:rgba(242,251,246,.94);
  border-top:3px solid var(--ink);
  border-bottom:3px solid var(--ink);
}

.anchors nav{
  max-width:1240px;
  margin:0 auto;
  padding:0 clamp(10px,3vw,28px);
  overflow-x:auto;
  scrollbar-width:thin;
}

.anchors ol{
  display:flex;
  gap:8px;
  margin:0;
  padding:10px 0;
  list-style:none;
}

.anchors a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 16px;
  font-size:16px;
  font-weight:600;
  white-space:nowrap;
  text-decoration:none;
  background:var(--clay);
  border:2px solid var(--line);
  border-radius:999px;
  transition:background .18s ease, border-color .18s ease, opacity .18s ease;
}

.anchors a:hover{background:var(--mint);border-color:var(--ink)}

.anchors li{transition:opacity .2s ease}

/* ---------- 全屏遮罩菜单 ---------- */

.overlay{
  position:fixed;
  inset:0;
  z-index:60;
  display:grid;
  grid-template-rows:auto 1fr;
  overflow:auto;
  padding:18px clamp(16px,5vw,48px) 40px;
  background:linear-gradient(160deg,var(--mint),var(--blue) 78%);
  visibility:hidden;
  opacity:0;
  transform:translateY(-10px);
  transition:opacity .26s ease, transform .26s cubic-bezier(.34,1.56,.64,1), visibility .26s;
}

.overlay.open{visibility:visible;opacity:1;transform:none}

.overlay-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}

.overlay-brand{font-weight:800;font-size:18px;letter-spacing:.06em}

.overlay nav ol{
  list-style:none;
  max-width:720px;
  margin:0;
  padding:26px 0 0;
  display:grid;
  gap:12px;
}

.overlay nav a{
  display:flex;
  align-items:center;
  min-height:56px;
  padding:0 22px;
  font-size:19px;
  font-weight:700;
  text-decoration:none;
  background:rgba(255,255,255,.78);
  border:3px solid var(--ink);
  border-radius:var(--r-md);
  box-shadow:inset -3px -3px 0 rgba(23,38,32,.1), 5px 5px 0 var(--ink);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1);
}

.overlay nav a:active{transform:translate(4px,4px)}

/* ---------- 首屏 ---------- */

.hero{
  display:grid;
  grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);
  align-items:center;
  gap:clamp(18px,4vw,52px);
  min-height:70vh;
  max-width:1180px;
  margin:0 auto;
  padding:clamp(22px,4vw,48px) clamp(16px,4vw,40px) clamp(28px,5vw,56px);
}

.hero-art{
  position:relative;
  display:grid;
  place-items:center;
  aspect-ratio:4/5;
  overflow:hidden;
  border:4px solid var(--ink);
  border-radius:32px;
  background:linear-gradient(150deg,var(--mint),var(--blue));
  box-shadow:inset -7px -7px 0 rgba(23,38,32,.12), 10px 10px 0 var(--ink);
}

.hero-img{width:100%;height:100%;object-fit:cover}

.blob{
  width:58%;
  aspect-ratio:1;
  border-radius:50%;
  background:radial-gradient(circle at 34% 28%,#ffffff,var(--mint) 58%,var(--blue));
  box-shadow:inset -8px -8px 0 rgba(23,38,32,.1);
}

.hero-copy{text-align:center}

.pill{
  display:inline-block;
  margin:0 0 14px;
  padding:6px 16px;
  font-size:15px;
  font-weight:700;
  background:var(--blue);
  border:3px solid var(--ink);
  border-radius:999px;
  box-shadow:inset -2px -2px 0 rgba(23,38,32,.14), 3px 3px 0 var(--ink);
}

.hero-copy h1{
  margin:0 0 22px;
  font-family:"Playfair Display",Inter,system-ui,sans-serif;
  font-size:clamp(34px,6.4vw,64px);
  line-height:1.08;
  font-weight:800;
  letter-spacing:-.03em;
}

.cta{
  display:inline-flex;
  align-items:center;
  min-height:54px;
  padding:0 32px;
  font-weight:800;
  font-size:17px;
  text-decoration:none;
  background:var(--mint);
  border:3px solid var(--ink);
  border-radius:999px;
  box-shadow:var(--lift);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1), box-shadow .2s ease-out;
}

.cta:hover{background:#caffee}

.cta:active{transform:translate(4px,4px);box-shadow:inset -3px -3px 0 rgba(23,38,32,.12),0 0 0 var(--ink)}

/* ---------- 正文区 ---------- */

.wrap{
  display:grid;
  grid-template-columns:248px minmax(0,1fr);
  align-items:start;
  gap:clamp(18px,3vw,40px);
  max-width:1180px;
  margin:0 auto;
  padding:0 clamp(16px,4vw,40px) clamp(48px,7vw,80px);
}

.rail{
  position:sticky;
  top:84px;
  padding:18px;
  background:var(--clay);
  border:3px solid var(--ink);
  border-radius:var(--r-md);
  box-shadow:var(--lift-soft);
}

.rail h2{
  margin:0 0 10px;
  font-size:15px;
  font-weight:800;
  letter-spacing:.18em;
}

.rail hr{
  height:3px;
  margin:0 0 14px;
  border:0;
  border-radius:3px;
  background:repeating-linear-gradient(90deg,var(--blue) 0 6px,transparent 6px 12px);
}

.rail-list{
  display:grid;
  gap:6px;
  margin:0;
  padding:0;
  list-style:none;
}

.rail-list a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  font-size:16px;
  font-weight:600;
  text-decoration:none;
  border-radius:12px;
  background:var(--soft);
  transition:background .18s ease, transform .18s ease;
}

.rail-list a:hover{background:var(--mint);transform:translateX(2px)}

.content{
  min-width:0;
  max-width:74ch;
}

.content > section{
  margin:0 0 22px;
  padding:clamp(20px,3vw,34px);
  background:var(--clay);
  border-radius:10px;
  scroll-margin-top:96px;
  box-shadow:0 12px 24px rgba(23,38,32,.08);
  transition:opacity .25s ease;
}

.content > section:nth-of-type(even){background:var(--soft)}

.content > section.dim,
.anchors li.dim{opacity:.24}

.content h2{
  margin:0 0 8px;
  font-size:clamp(22px,3vw,30px);
  line-height:1.28;
  font-weight:800;
}

.content h3{
  margin:1.4em 0 .5em;
  font-size:clamp(18px,2.2vw,21px);
  font-weight:700;
}

.content hr{
  width:64px;
  height:5px;
  margin:0 0 18px;
  border:0;
  border-radius:5px;
  background:linear-gradient(90deg,var(--mint),var(--blue));
}

.content p{margin:0 0 1em}

.content p:last-child{margin-bottom:0}

.content ul,.content ol{margin:0 0 1em;padding-left:1.3em}

.content li{margin:0 0 .45em}

.content a{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}

.content a:hover{background:var(--mint)}

.content img{border-radius:10px;margin:0 0 1em}

.content blockquote{
  margin:0 0 1em;
  padding:14px 18px;
  background:linear-gradient(140deg,var(--mint),var(--blue));
  border-radius:10px;
  box-shadow:inset -3px -3px 0 rgba(23,38,32,.1);
}

/* ---------- 页脚 ---------- */

.foot{
  padding:clamp(32px,5vw,64px) clamp(16px,4vw,40px) 30px;
  color:#eafaf3;
  background:var(--ink);
  border-top:4px solid var(--ink);
}

.cta-block{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:18px;
  max-width:1180px;
  margin:0 auto 38px;
  padding:clamp(22px,4vw,40px);
  color:var(--ink);
  background:linear-gradient(140deg,var(--mint),var(--blue));
  border:4px solid var(--ink);
  border-radius:var(--r-lg);
  box-shadow:inset -6px -6px 0 rgba(23,38,32,.12), 8px 8px 0 rgba(255,255,255,.2);
}

.cta-title{
  margin:0;
  font-size:clamp(22px,4vw,34px);
  font-weight:800;
}

.cta-btn{
  display:inline-flex;
  align-items:center;
  min-height:52px;
  padding:0 26px;
  font-weight:800;
  text-decoration:none;
  background:#fff;
  border:3px solid var(--ink);
  border-radius:999px;
  box-shadow:var(--lift);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1);
}

.cta-btn:active{transform:translate(4px,4px)}

.foot-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
  max-width:1180px;
  margin:0 auto;
  padding-top:28px;
  border-top:2px solid rgba(234,250,243,.22);
}

.foot-cols dl{margin:0}

.foot-cols dt{
  margin-bottom:8px;
  font-size:15px;
  letter-spacing:.18em;
  color:#9fdfc8;
}

.foot-cols dd{margin:0}

.foot-cols a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 2px;
  color:#eafaf3;
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:border-color .18s ease, color .18s ease;
}

.foot-cols a:hover{color:var(--mint);border-color:var(--mint)}

.copy{
  max-width:1180px;
  margin:26px auto 0;
  font-size:15px;
  color:#9fdfc8;
}

/* ---------- 动效 ---------- */

.js .reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s ease-out, transform .55s cubic-bezier(.34,1.56,.64,1);
}

.js .reveal.in{opacity:1;transform:none}

/* ---------- 断点 ---------- */

@media (max-width:900px){
  .hero{grid-template-columns:minmax(0,1fr);min-height:0;gap:20px;padding-top:20px}
  .hero-art{aspect-ratio:16/9;max-height:190px;border-radius:24px;box-shadow:inset -5px -5px 0 rgba(23,38,32,.12), 7px 7px 0 var(--ink)}
  .wrap{grid-template-columns:minmax(0,1fr)}
  .rail{position:static}
  .rail-list{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:620px){
  body{font-size:16px}
  .foot-cols{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
  .cta-block{border-radius:22px}
  .hero-copy h1{letter-spacing:-.02em}
}

@media (max-width:420px){
  .topbar{padding-top:12px}
  .search input{width:116px}
  .foot-cols{grid-template-columns:minmax(0,1fr);gap:6px}
  .foot-cols dt{margin-top:10px}
}

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

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