:root{
  --mint:#b4fde1;
  --ice:#add8e6;
  --ink:#172620;
  --paper:#f4fcf8;
  --mint-deep:#79e9c3;
  --ice-soft:#eaf7fe;
  --card:#ffffff;
  --r-xl:34px;
  --r-lg:28px;
  --r-md:20px;
  --r-pill:999px;
  --clay-outer:5px 7px 0 rgba(23,38,32,.15), 0 16px 30px rgba(23,38,32,.10);
  --clay-inner:inset -3px -4px 10px rgba(23,38,32,.12), inset 4px 5px 12px rgba(255,255,255,.9);
  --font:"Space Mono", ui-monospace, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", monospace;
  --wide:"Syncopate", "Space Mono", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*{box-sizing:border-box}

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

html.menu-open,
html.menu-open body{overflow:hidden}

body{
  margin:0;
  font-family:var(--font);
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:radial-gradient(rgba(23,38,32,.10) 1.5px, transparent 1.5px);
  background-size:22px 22px;
}

a{color:inherit}

:focus-visible{outline:3px solid var(--ink);outline-offset:3px;border-radius:6px}

img{max-width:100%}

/* 页头 */
.site-header{position:relative;z-index:50;padding:14px 16px 8px}

.bar{position:relative;z-index:70;display:flex;align-items:center;justify-content:space-between;gap:12px}

.brand{
  display:inline-flex;align-items:center;gap:10px;
  min-height:48px;padding:6px 16px;
  border:4px solid var(--ink);border-radius:var(--r-pill);
  background:linear-gradient(140deg,var(--mint),var(--ice));
  color:var(--ink);text-decoration:none;
  font-family:var(--wide);font-weight:700;letter-spacing:.08em;
  box-shadow:var(--clay-outer),var(--clay-inner);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1);
}
.brand:hover{transform:translateY(-2px)}
.brand-mark{display:block;width:32px;height:32px;border-radius:50%}
.brand-name{font-size:1rem}

.burger{
  min-height:48px;padding:0 20px;
  border:4px solid var(--ink);border-radius:var(--r-pill);
  background:#fff;color:var(--ink);
  font-family:var(--wide);font-size:.95rem;font-weight:700;letter-spacing:.1em;
  cursor:pointer;box-shadow:var(--clay-outer),var(--clay-inner);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1),background .2s ease-out;
}
.burger:hover{transform:translateY(-2px);background:var(--mint)}
.burger:active{transform:translateY(2px)}

.menu{
  position:fixed;inset:0;z-index:60;
  display:none;align-items:center;justify-content:center;
  padding:24px;overflow:auto;
  background:linear-gradient(165deg,#d9fbef,#cfe8f6 58%,#b4fde1);
}
.menu.open{display:flex}
.menu p{display:flex;flex-direction:column;gap:12px;margin:0;width:min(560px,100%)}
.menu a{
  display:flex;align-items:center;justify-content:center;
  min-height:56px;padding:12px 18px;
  border:4px solid var(--ink);border-radius:var(--r-md);
  background:#fff;color:var(--ink);text-decoration:none;
  font-family:var(--wide);font-size:1.02rem;letter-spacing:.06em;
  box-shadow:var(--clay-outer),var(--clay-inner);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1),background .2s ease-out;
}
.menu a:hover{transform:translateY(-3px);background:var(--mint)}

/* 二级粘性锚点条 */
.rail{
  position:sticky;top:0;z-index:30;
  display:flex;gap:8px;overflow-x:auto;
  padding:10px 16px;
  background:rgba(244,252,248,.94);
  border-bottom:3px solid var(--ink);
  backdrop-filter:blur(6px);
}
.rail a{
  flex:0 0 auto;display:inline-flex;align-items:center;
  min-height:44px;padding:0 16px;
  border:3px solid var(--ink);border-radius:var(--r-pill);
  background:#fff;color:var(--ink);text-decoration:none;font-size:16px;
  box-shadow:2px 3px 0 rgba(23,38,32,.14);
  transition:background .18s ease-out,transform .18s ease-out;
}
.rail a:hover{background:var(--mint);transform:translateY(-2px)}

/* 版心 */
.wrap{
  max-width:1200px;margin:0 auto;padding:20px 16px 60px;
  display:grid;grid-template-columns:264px minmax(0,1fr);
  gap:24px;align-items:start;
}

.content{min-width:0}

.prose{display:flex;flex-direction:column;gap:24px}

/* 侧栏 */
.side{
  position:sticky;top:92px;
  padding:22px 18px;
  border:4px solid var(--ink);border-radius:var(--r-lg);
  background:linear-gradient(170deg,var(--mint),#dbf7ee);
  box-shadow:var(--clay-outer),var(--clay-inner);
}
.side-h{margin:0 0 14px;font-family:var(--wide);font-size:1.02rem;letter-spacing:.06em;line-height:1.4}
.side-h .tag{
  display:inline-block;margin-left:.5em;padding:2px 10px;
  border-radius:var(--r-pill);background:var(--ice);
  font-size:.66em;letter-spacing:.1em;vertical-align:middle;
}

.side-list{
  list-style:none;margin:0 0 14px;padding:0;
  display:flex;flex-direction:column;gap:8px;
  counter-reset:s;
}
.side-list li{counter-increment:s}
.side-list a{
  display:flex;align-items:center;gap:10px;
  min-height:44px;padding:8px 12px;
  border-radius:var(--r-md);
  background:rgba(255,255,255,.7);
  color:var(--ink);text-decoration:none;font-size:16px;line-height:1.4;
  box-shadow:inset -2px -2px 6px rgba(23,38,32,.10);
  transition:background .18s ease-out,transform .18s ease-out;
}
.side-list a::before{
  content:counter(s,decimal-leading-zero);
  font-family:var(--wide);font-size:.76rem;color:#2a5045;
}
.side-list a:hover{background:#fff;transform:translateX(2px)}

.side-note{margin:0;font-size:16px;line-height:1.6;color:#24463b}

/* 主视觉 */
.hero{
  position:relative;display:grid;align-content:end;justify-items:end;
  min-height:100vh;min-height:100svh;overflow:hidden;
  border:4px solid var(--ink);
  border-radius:var(--r-lg) var(--r-lg) 54px 54px;
  background:linear-gradient(155deg,#e7fbf3,#d3ecf7 70%,#bfe6f4);
  box-shadow:var(--clay-outer),var(--clay-inner);
}
.hero-media{position:absolute;inset:0;z-index:0}
.hero-media img{display:block;width:100%;height:100%;object-fit:cover}

.hero-copy{
  position:relative;z-index:2;
  max-width:min(620px,92%);
  margin:0 18px 22px;padding:26px 24px;
  text-align:right;
  border:4px solid var(--ink);border-radius:var(--r-xl);
  background:rgba(255,255,255,.92);
  box-shadow:var(--clay-outer),var(--clay-inner);
}
.eyebrow{
  display:inline-block;margin:0;padding:6px 14px;
  border-radius:var(--r-pill);background:var(--ink);color:var(--mint);
  font-family:var(--wide);font-size:.78rem;letter-spacing:.12em;
}
.hero-copy h1{
  margin:.18em 0 .35em;
  font-family:var(--wide);font-weight:700;
  font-size:clamp(1.7rem,5.4vw,3rem);line-height:1.22;letter-spacing:.03em;
}
.lede{margin:0 0 .9em;font-size:1rem;line-height:1.7}

.cta{
  display:inline-flex;align-items:center;
  min-height:52px;padding:0 26px;
  border:4px solid var(--ink);border-radius:var(--r-pill);
  background:var(--mint);color:var(--ink);text-decoration:none;
  font-family:var(--wide);font-weight:700;letter-spacing:.06em;
  box-shadow:var(--clay-outer),var(--clay-inner);
  transition:transform .2s cubic-bezier(.34,1.56,.64,1),background .2s ease-out;
}
.cta:hover{transform:translateY(-3px) scale(1.02);background:var(--ice)}
.cta:active{transform:translateY(2px) scale(.99)}

/* 正文卡片 */
.prose > div{
  padding:30px 26px;
  border-radius:var(--r-lg);
  background:var(--card);
  scroll-margin-top:96px;
  box-shadow:0 16px 28px rgba(23,38,32,.10), inset -3px -4px 10px rgba(23,38,32,.05), inset 4px 5px 12px rgba(255,255,255,.9);
}
.prose > div:nth-child(even){background:var(--ice-soft)}

.prose h2,
.prose h3{
  margin:0 0 .6em;
  font-family:var(--wide);font-weight:700;line-height:1.35;letter-spacing:.03em;
}
.prose h2{font-size:clamp(1.24rem,3.2vw,1.66rem)}
.prose h3{font-size:clamp(1.08rem,2.6vw,1.28rem)}
.prose h2 span span,
.prose h3 span span{
  display:inline-block;margin-left:.5em;padding:2px 10px;
  border-radius:var(--r-pill);background:var(--mint);
  font-size:.62em;letter-spacing:.1em;vertical-align:middle;
}
.prose p{margin:0 0 1em}
.prose p:last-child{margin-bottom:0}
.prose ul,.prose ol{padding-left:1.4em;margin:0 0 1em}
.prose li{margin-bottom:.4em}
.prose a{color:#0f5c46;text-decoration:underline;text-underline-offset:3px}
.prose blockquote{
  margin:0 0 1em;padding:14px 18px;
  border-left:6px solid var(--mint-deep);border-radius:0 var(--r-md) var(--r-md) 0;
  background:#f0fbf7;
}

/* 页脚 */
.site-footer{
  margin-top:12px;padding:34px 16px 26px;
  background:linear-gradient(180deg,#e8fbf3,#cbeade);
  border-top:4px solid var(--ink);
}

.foot-top{
  display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:center;
  max-width:1160px;margin:0 auto 28px;
}
.foot-h{margin:0;font-family:var(--wide);font-size:clamp(1.16rem,3vw,1.5rem);line-height:1.35;letter-spacing:.03em}
.foot-h .tag{
  display:inline-block;margin-left:.5em;padding:2px 10px;
  border-radius:var(--r-pill);background:#fff;
  font-size:.6em;letter-spacing:.1em;vertical-align:middle;
}

.sub-form label{display:block;margin-bottom:8px;font-size:16px}
.sub-row{display:flex;gap:10px;flex-wrap:wrap}
.sub-row input{
  flex:1 1 190px;min-height:48px;padding:0 18px;
  border:4px solid var(--ink);border-radius:var(--r-pill);
  font:inherit;font-size:16px;background:#fff;
  box-shadow:inset -2px -3px 8px rgba(23,38,32,.10);
}
.sub-row button{
  min-height:48px;padding:0 24px;
  border:4px solid var(--ink);border-radius:var(--r-pill);
  background:var(--mint);color:var(--ink);
  font:inherit;font-weight:700;cursor:pointer;
  box-shadow:var(--clay-outer),var(--clay-inner);
}
.sub-row button:hover{background:var(--ice)}
.sub-note{margin:8px 0 0;font-size:16px;min-height:1.2em}

.foot-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:22px;
  max-width:1160px;margin:0 auto;padding-top:22px;
  border-top:3px dashed rgba(23,38,32,.35);
}
.foot-grid dl{margin:0}
.foot-grid dt{font-family:var(--wide);font-size:.9rem;letter-spacing:.08em;margin-bottom:6px}
.foot-grid dd{margin:0;font-size:16px;line-height:1.6;color:#24463b}
.foot-grid dd a{
  display:inline-flex;align-items:center;min-height:40px;padding-right:6px;
  text-decoration:none;border-bottom:2px solid transparent;
}
.foot-grid dd a:hover{border-bottom-color:var(--ink)}
.foot-logo{margin:0 0 8px;font-family:var(--wide);font-size:1.1rem;letter-spacing:.08em}
.foot-desc{margin:0;font-size:16px;line-height:1.65;color:#24463b}

.copyright{
  max-width:1160px;margin:26px auto 0;padding-top:14px;
  border-top:3px solid rgba(23,38,32,.22);
  font-size:15px;text-align:center;
}

/* 滚动显现 */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .5s ease-out,transform .5s cubic-bezier(.34,1.56,.64,1)}
.reveal.in{opacity:1;transform:none}

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

@media (max-width:980px){
  .wrap{grid-template-columns:1fr;padding-bottom:44px}
  .side{position:static;order:2}
  .foot-top{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
}

@media (max-width:620px){
  body{font-size:16px}
  .brand-name{font-size:.92rem}
  .hero{min-height:92svh;border-radius:var(--r-lg) var(--r-lg) 40px 40px}
  .hero-copy{max-width:100%;margin:0 12px 16px;padding:20px 18px}
  .prose > div{padding:22px 18px;border-radius:24px}
  .foot-grid{grid-template-columns:1fr}
}

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