@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root{
  --mint:#b4fde1;
  --sky:#add8e6;
  --ink:#172620;
  --paper:#f2fbf7;
  --edge:rgba(23,38,32,.16);
  --deep:#2f7a5e;
  --outer:6px 9px 22px rgba(23,38,32,.14);
  --inner:inset -4px -4px 10px rgba(23,38,32,.09), inset 5px 5px 14px rgba(255,255,255,.95);
  --r-xl:26px;
  --r-lg:22px;
  --r-md:16px;
  --fh:'Space Grotesk','DM Sans',system-ui,-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --fb:'DM Sans',system-ui,-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
}

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

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

body{
  margin:0;
  font-family:var(--fb);
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background:
    radial-gradient(circle at 10% 4%, rgba(180,253,225,.9), transparent 48%),
    radial-gradient(circle at 92% 2%, rgba(173,216,230,.85), transparent 42%),
    radial-gradient(circle at 50% 104%, rgba(180,253,225,.7), transparent 52%),
    var(--paper);
  background-attachment:fixed;
  min-height:100vh;
  overflow-x:hidden;
}

img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3{font-family:var(--fh);line-height:1.16;letter-spacing:-.018em;margin:0 0 .55em}
p{margin:0 0 1em}
:focus-visible{outline:3px solid #0b6b4c;outline-offset:3px;border-radius:8px}

/* ---------- 顶部 ---------- */
.top{
  position:sticky;top:0;z-index:40;
  border-bottom:3px solid var(--edge);
  background:linear-gradient(180deg,rgba(242,251,247,.97),rgba(242,251,247,.84));
  backdrop-filter:blur(12px);
  box-shadow:0 10px 22px rgba(23,38,32,.08);
}
.ticker{
  margin:0 0 6px;padding:7px 16px;text-align:center;
  font-family:var(--fh);font-size:14px;font-weight:600;letter-spacing:.2em;
  color:#0b3226;
  background:linear-gradient(90deg,var(--mint),var(--sky));
  border-bottom:2px solid var(--edge);
}
.bar{
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:6px;
  padding:4px 12px 10px;
}
.brand{
  grid-column:2;justify-self:center;
  display:inline-flex;align-items:center;gap:9px;min-height:44px;padding:5px 16px;
  border:3px solid var(--edge);border-radius:999px;
  background:linear-gradient(160deg,#fff 30%,var(--mint));
  box-shadow:var(--inner),3px 4px 12px rgba(23,38,32,.12);
  font-family:var(--fh);font-weight:700;text-decoration:none;letter-spacing:.02em;
}
.mark{
  width:18px;height:18px;border-radius:7px;flex:none;
  border:3px solid var(--ink);
  background:linear-gradient(145deg,var(--sky),var(--mint));
  box-shadow:inset -2px -2px 4px rgba(23,38,32,.3);
}
.brand-t{font-size:18px;white-space:nowrap}

.menu{position:relative}
.menu summary{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:44px;padding:8px 14px;cursor:pointer;list-style:none;
  border:3px solid var(--edge);border-radius:var(--r-md);
  background:linear-gradient(160deg,#fff,rgba(173,216,230,.6));
  box-shadow:var(--inner),2px 3px 10px rgba(23,38,32,.1);
  font-family:var(--fh);font-size:14px;font-weight:700;letter-spacing:.1em;
}
.menu summary::-webkit-details-marker{display:none}
.menu[open] summary{background:linear-gradient(160deg,#fff,var(--mint))}
.menu menu{
  position:absolute;top:calc(100% + 10px);left:0;z-index:50;
  margin:0;padding:8px;list-style:none;min-width:196px;
  border:3px solid var(--edge);border-radius:var(--r-lg);
  background:#fff;box-shadow:var(--inner),var(--outer);
  display:none;
}
.menu[open] > menu{display:block}
.side-b menu{left:auto;right:0}
.menu a{
  display:flex;align-items:center;min-height:44px;padding:8px 12px;
  border-radius:12px;text-decoration:none;font-size:16px;
}
.menu a:hover,.menu a:focus-visible{background:var(--mint)}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;overflow:hidden;
  display:grid;place-items:center;text-align:center;
  min-height:calc(100vh - 118px);
  padding:52px 18px 66px;
  border-bottom:3px solid var(--edge);
}
.ghost{
  position:absolute;left:50%;top:50%;
  transform:translate(-50%,calc(-50% + var(--par,0px)));
  font-family:var(--fh);font-weight:700;line-height:.86;letter-spacing:-.06em;
  font-size:clamp(4.4rem,24vw,16rem);white-space:nowrap;
  color:rgba(23,38,32,.075);
  text-shadow:0 6px 0 rgba(255,255,255,.65);
  pointer-events:none;user-select:none;
}
.hero-in{
  position:relative;z-index:1;
  display:grid;justify-items:center;gap:20px;max-width:1000px;
}
.hero h1{
  margin:0;max-width:16ch;
  font-size:clamp(2rem,7.6vw,4.4rem);
  color:#10251d;
  text-shadow:0 2px 0 #fff,0 10px 26px rgba(23,38,32,.14);
}
.sub{max-width:46ch;margin:0;font-size:17px;color:rgba(23,38,32,.78)}

/* ---------- 主体 ---------- */
.shell{
  max-width:1140px;margin:0 auto;
  padding:32px 16px 62px;
  display:grid;gap:24px;
}

.rail{
  align-self:start;padding:18px;
  border:3px solid var(--edge);border-radius:var(--r-xl);
  background:linear-gradient(165deg,#fff,rgba(180,253,225,.55));
  box-shadow:var(--inner),var(--outer);
}
.rail small{
  display:block;font-family:var(--fh);font-size:13px;font-weight:700;
  letter-spacing:.26em;color:var(--deep);
}
.rail h2{font-size:20px;margin:2px 0 12px}
.rail-list{
  list-style:none;margin:0 0 12px;padding:0;
  display:grid;grid-template-columns:1fr 1fr;gap:4px;
}
.rail-list a{
  display:flex;align-items:center;min-height:44px;padding:6px 10px;
  border-radius:12px;border:2px solid transparent;
  text-decoration:none;font-size:15px;line-height:1.3;
}
.rail-list a:hover,.rail-list a:focus-visible{background:#fff;border-color:var(--edge)}
.up{
  display:inline-flex;align-items:center;min-height:44px;padding:6px 16px;
  border-radius:999px;background:var(--ink);color:var(--mint);
  text-decoration:none;font-size:14px;letter-spacing:.08em;font-weight:600;
  box-shadow:var(--outer);
}
.up:hover{transform:translateY(-1px)}

.doc{min-width:0}
.body{display:grid;gap:22px}
.body > article{
  padding:26px 20px;
  border:3px solid var(--edge);border-radius:var(--r-xl);
  background:linear-gradient(170deg,#fff,rgba(173,216,230,.24));
  box-shadow:var(--inner),var(--outer);
  scroll-margin-top:124px;
  animation:rise .55s cubic-bezier(.34,1.56,.64,1) both;
}
.body > article:nth-child(even){background:linear-gradient(170deg,#fff,rgba(180,253,225,.42))}
.body > article:nth-child(2){animation-delay:.05s}
.body > article:nth-child(3){animation-delay:.1s}
.body > article:nth-child(4){animation-delay:.15s}
.body > article:nth-child(5){animation-delay:.2s}
.body > article:nth-child(6){animation-delay:.25s}
.body > article:nth-child(7){animation-delay:.3s}
.body > article:nth-child(n+8){animation-delay:.35s}

@keyframes rise{
  from{opacity:0;transform:translateY(18px) scale(.985)}
  to{opacity:1;transform:none}
}

.body small{
  display:block;margin-bottom:4px;
  font-family:var(--fh);font-size:13px;font-weight:700;letter-spacing:.24em;
  color:var(--deep);
}
.body h2{font-size:clamp(1.35rem,4.2vw,1.9rem)}
.body h3{font-size:1.15rem}
.body p,.body li{font-size:17px;line-height:1.8}
.body ul,.body ol{padding-left:1.2em;margin:0 0 1em}
.body li{margin-bottom:.35em}
.body a{color:#0b6b4c;text-decoration-thickness:2px;text-underline-offset:3px}
.body a:hover{background:var(--mint)}
.body img{border-radius:var(--r-md);border:3px solid var(--edge);box-shadow:var(--outer);margin:1em 0}
.body blockquote{
  margin:0 0 1em;padding:12px 16px;
  border-left:5px solid var(--mint);border-radius:0 var(--r-md) var(--r-md) 0;
  background:rgba(255,255,255,.7);
}
.body time{font-family:var(--fh);font-size:14px;letter-spacing:.06em;color:var(--deep)}

/* ---------- 页脚 ---------- */
.foot{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;
  padding:30px 18px 38px;
  border-top:3px solid var(--edge);
  background:linear-gradient(180deg,rgba(173,216,230,.4),rgba(180,253,225,.6));
}
.foot-mark{
  margin:0;font-family:var(--fh);font-weight:700;line-height:.86;letter-spacing:-.055em;
  font-size:clamp(2.2rem,11.5vw,5.2rem);
}
.foot-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px 16px;
  min-height:44px;font-size:14px;color:#1d4136;
}
.foot-meta a{
  display:inline-flex;align-items:center;min-height:44px;padding:0 2px;
  text-decoration:none;border-bottom:2px solid rgba(23,38,32,.28);
}
.foot-meta a:hover{border-color:var(--ink)}

/* ---------- 桌面 ---------- */
@media (min-width:900px){
  .bar{padding:2px 22px 12px;gap:14px}
  .menu summary{display:none}
  .menu[open] > menu,.menu > menu{
    position:static;display:flex;flex-wrap:wrap;gap:2px;
    min-width:0;padding:0;border:0;background:none;box-shadow:none;
  }
  .side-b > menu{justify-content:flex-end}
  .menu a{font-size:16px;padding:8px 12px}
  .menu a:hover{background:rgba(180,253,225,.85);border-radius:999px}

  .shell{grid-template-columns:238px minmax(0,1fr);gap:34px;padding-top:46px}
  .rail{position:sticky;top:112px}
  .rail-list{grid-template-columns:1fr}
  .body > article{padding:32px 30px}
  .foot{padding:36px 30px 44px}
}

@media (min-width:1140px){
  .body > article{padding:36px 38px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
  .ghost{transform:translate(-50%,-50%)}
}

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