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

:root{
  --mint:#b4fde1;
  --sky:#add8e6;
  --ink:#172620;
  --ink-2:#2f463c;
  --muted:#546a62;
  --paper:#f4fbf8;
  --line:rgba(23,38,32,.16);
  --edge:3px solid var(--line);
  --r-xl:28px;
  --r-lg:22px;
  --r-md:16px;
  --clay:8px 8px 20px rgba(23,38,32,.13), inset -3px -3px 9px rgba(23,38,32,.09), inset 3px 3px 9px rgba(255,255,255,.72);
  --clay-sm:5px 5px 12px rgba(23,38,32,.12), inset -2px -2px 6px rgba(23,38,32,.08), inset 2px 2px 6px rgba(255,255,255,.7);
}

*,*::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:1.75;
  color:var(--ink);
  background:
    radial-gradient(900px 620px at 8% -8%, #d8fcee 0%, rgba(216,252,238,0) 62%),
    radial-gradient(760px 560px at 102% 2%, #d6ecf7 0%, rgba(214,236,247,0) 58%),
    var(--paper);
  background-attachment:fixed;
}
img{max-width:100%;height:auto}
a{color:var(--ink-2)}
:focus-visible{outline:3px solid #145c46;outline-offset:2px}

.skip{
  position:absolute;left:12px;top:-70px;z-index:80;
  padding:12px 18px;min-height:44px;display:inline-flex;align-items:center;
  background:#fff;border:var(--edge);border-radius:14px;
  text-decoration:none;font-weight:600;transition:top .2s ease-out;
}
.skip:focus{top:12px}

.shell{display:grid;grid-template-columns:266px minmax(0,1fr);min-height:100vh}

/* 左侧竖导航 */
.rail{
  position:sticky;top:0;height:100vh;z-index:40;
  display:flex;flex-direction:column;gap:16px;
  padding:24px 18px;
  background:linear-gradient(165deg,#cbfde9 0%,#c6ecf6 58%,#dcf8f2 100%);
  border-right:var(--edge);
  border-radius:0 30px 30px 0;
  box-shadow:var(--clay);
  overflow-y:auto;
}
.brand{
  display:flex;align-items:center;gap:10px;
  min-height:56px;padding:10px 12px;
  text-decoration:none;font-weight:600;
  border:var(--edge);border-radius:var(--r-md);
  background:rgba(255,255,255,.66);
  box-shadow:var(--clay-sm);
  transition:transform .2s ease-out;
}
.brand:active{transform:translateY(2px)}
.brand-img{width:34px;height:34px;border-radius:10px;object-fit:cover}
.brand-mark{
  display:grid;place-items:center;width:34px;height:34px;
  border-radius:10px;background:var(--ink);color:var(--mint);font-size:18px;font-weight:600;
}
.brand-name{font-size:16px;letter-spacing:.01em;line-height:1.3}
.rail-nav{flex:1 1 auto;min-height:0}
.rail-nav ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.rl{
  display:flex;align-items:center;gap:10px;
  min-height:44px;padding:11px 12px;
  text-decoration:none;border-radius:var(--r-md);
  border:3px solid transparent;
  transition:transform .2s ease-out,background .2s,border-color .2s;
}
.rl:hover{background:rgba(255,255,255,.62);border-color:var(--line)}
.rl:active{transform:translateY(2px)}
.rl[aria-current]{background:#fff;border-color:var(--ink);box-shadow:var(--clay-sm)}
.rl-i{font-size:14px;font-weight:600;color:var(--muted);min-width:16px;text-align:center}
.rl[aria-current] .rl-i{color:var(--ink)}
.rl-t{font-size:16px}
.rail-cta{
  display:flex;align-items:center;justify-content:center;
  min-height:48px;padding:12px 16px;
  text-decoration:none;font-weight:600;font-size:16px;
  border-radius:18px;background:var(--ink);color:#eafff7;
  border:3px solid #0d1a15;
  box-shadow:5px 5px 0 rgba(23,38,32,.22);
  transition:transform .2s ease-out,box-shadow .2s ease-out;
}
.rail-cta:active{transform:translateY(3px);box-shadow:2px 2px 0 rgba(23,38,32,.22)}

/* 右侧主区 */
.stage{width:100%;max-width:1180px;padding:22px 30px 40px}
.topbar{
  position:sticky;top:0;z-index:30;
  display:flex;justify-content:flex-end;
  padding:8px 0 14px;
  background:linear-gradient(to bottom,rgba(244,251,248,.94),rgba(244,251,248,0));
  backdrop-filter:blur(6px);
}
.top-cta{
  display:inline-flex;align-items:center;
  min-height:44px;padding:10px 22px;
  border-radius:24px;background:#fff;color:var(--ink);
  border:var(--edge);box-shadow:var(--clay-sm);
  text-decoration:none;font-weight:600;font-size:16px;
  transition:transform .2s ease-out;
}
.top-cta:active{transform:translateY(2px)}

.split{display:grid;grid-template-columns:minmax(0,1fr) 236px;gap:26px;align-items:start}
main{min-width:0}
.paper{
  background:linear-gradient(175deg,#ffffff 0%,#f7fdfa 100%);
  border:var(--edge);border-radius:var(--r-xl);
  box-shadow:var(--clay);
  overflow:hidden;
}

/* 首屏 */
.hero{
  display:flex;flex-direction:column;justify-content:center;gap:24px;
  min-height:70vh;padding:54px 30px 0;text-align:center;
  background:
    radial-gradient(520px 330px at 50% 0%,rgba(180,253,225,.9),rgba(180,253,225,0) 72%),
    linear-gradient(180deg,#f0fffa 0%,#ffffff 74%);
}
.hero-copy{display:flex;flex-direction:column;align-items:center;gap:16px;max-width:660px;margin:0 auto}
.hero-h1{margin:0;font-size:clamp(1.9rem,3.5vw,3rem);line-height:1.18;letter-spacing:-.02em;font-weight:600}
.hero-sub{margin:0;max-width:50ch;color:var(--muted);font-size:17px}
.hero-btn{
  display:inline-flex;align-items:center;
  min-height:48px;padding:12px 28px;margin-top:4px;
  border-radius:26px;background:var(--ink);color:#eafff7;
  border:3px solid #0d1a15;
  box-shadow:5px 5px 0 rgba(23,38,32,.22),inset 0 2px 6px rgba(255,255,255,.18);
  text-decoration:none;font-weight:600;font-size:16px;
  transition:transform .2s ease-out,box-shadow .2s ease-out;
}
.hero-btn:active{transform:translateY(3px);box-shadow:2px 2px 0 rgba(23,38,32,.22)}
.hero-art{margin-top:auto;width:100%}
.hero-art img{
  display:block;width:100%;max-height:44vh;object-fit:cover;
  clip-path:polygon(0 11%,100% 0,100% 100%,0 100%);
  transform-origin:center bottom;
}

/* 正文 */
.body{padding:10px 32px 54px}
.body article[id]{padding:34px 0 12px;scroll-margin-top:20px}
.body article[id]:not(:first-child){border-top:3px dashed var(--line)}
.body h2,.body h3{margin:26px 0 12px;line-height:1.32;letter-spacing:-.01em}
.body h2{font-size:clamp(1.35rem,2.1vw,1.7rem)}
.body h3{font-size:1.15rem;color:var(--ink-2)}
.body h2 span,.body h3 span{background:linear-gradient(transparent 66%,var(--mint) 66%);padding-bottom:2px}
.body p{margin:0 0 14px}
.body ul,.body ol{margin:0 0 16px;padding-left:22px}
.body li{margin:6px 0}
.body a{color:#145c46;text-underline-offset:3px}
.body strong{color:var(--ink)}
.body blockquote{
  margin:18px 0;padding:14px 18px;
  background:rgba(173,216,230,.3);
  border:3px solid var(--line);border-radius:4px;
}
.body blockquote p:last-child{margin:0}
.body img{border:var(--edge);border-radius:4px;display:block;margin:16px 0}
.body table{width:100%;max-width:100%;border-collapse:collapse;font-size:16px}
.body th,.body td{border:2px solid var(--line);padding:8px 10px;text-align:left}

/* 右侧栏 */
.side{position:sticky;top:74px}
.side-card{
  padding:16px;
  border:var(--edge);border-radius:4px;
  background:linear-gradient(150deg,rgba(255,255,255,.78),rgba(173,216,230,.42));
  backdrop-filter:blur(10px);
  box-shadow:var(--clay-sm);
}
.side-h{margin:0 0 10px;font-size:1.05rem;line-height:1.4}
.side-h span{background:linear-gradient(transparent 66%,var(--mint) 66%)}
.side-list{list-style:none;margin:0 0 10px;padding:0;display:flex;flex-direction:column}
.side-list a{
  display:flex;align-items:center;min-height:40px;padding:6px 8px;
  border-radius:12px;text-decoration:none;font-size:16px;
  transition:background .2s;
}
.side-list a:hover{background:rgba(255,255,255,.8)}
.to-top{
  display:flex;align-items:center;justify-content:center;
  min-height:42px;padding:8px 12px;margin-top:4px;
  border-radius:14px;border:3px solid var(--line);
  background:rgba(255,255,255,.7);
  text-decoration:none;font-size:16px;font-weight:600;
}
.to-top:active{transform:translateY(2px)}

/* 页脚 */
.foot{
  padding:42px 30px 26px;
  background:linear-gradient(180deg,#e9fdf5 0%,#cdf0f7 100%);
  border-top:var(--edge);
  box-shadow:inset 0 6px 18px rgba(23,38,32,.07);
}
.foot-cta{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:14px;
  max-width:820px;margin:0 auto 28px;padding:26px 22px;
  text-align:center;
  border:var(--edge);border-radius:4px;
  background:linear-gradient(150deg,rgba(255,255,255,.85),rgba(180,253,225,.52));
  backdrop-filter:blur(10px);
  box-shadow:var(--clay-sm);
}
.cta-h{margin:0;font-size:1.3rem;line-height:1.3}
.cta-h span{background:linear-gradient(transparent 66%,var(--sky) 66%)}
.cta-b{
  display:inline-flex;align-items:center;
  min-height:48px;padding:12px 26px;
  border-radius:24px;background:var(--ink);color:#eafff7;
  border:3px solid #0d1a15;
  box-shadow:5px 5px 0 rgba(23,38,32,.2);
  text-decoration:none;font-weight:600;font-size:16px;
  transition:transform .2s ease-out,box-shadow .2s ease-out;
}
.cta-b:active{transform:translateY(3px);box-shadow:2px 2px 0 rgba(23,38,32,.2)}
.foot-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;max-width:820px;margin:0 auto}
.f-dl{
  margin:0;padding:14px 16px;
  background:rgba(255,255,255,.62);
  border:var(--edge);border-radius:4px;
}
.f-dl dt{font-weight:600;margin-bottom:6px}
.f-dl dd{margin:0}
.f-dl a{display:inline-flex;align-items:center;min-height:40px;text-decoration:none}
.foot-base{max-width:820px;margin:24px auto 0;text-align:center}
.copy{margin:0;font-size:16px;color:var(--ink-2)}

/* 入场 */
.rv{opacity:0;transform:translateY(16px);transition:opacity .5s cubic-bezier(.34,1.56,.64,1),transform .5s cubic-bezier(.34,1.56,.64,1)}
.rv.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
  .rv{opacity:1;transform:none}
}

@media (max-width:900px){
  .shell{grid-template-columns:minmax(0,1fr)}
  .rail{
    position:static;height:auto;flex-direction:row;flex-wrap:wrap;align-items:center;
    gap:8px;padding:10px 14px;
    border-right:0;border-bottom:var(--edge);border-radius:0 0 26px 26px;
    box-shadow:0 8px 18px rgba(23,38,32,.12);
    overflow:visible;
  }
  .brand{flex:0 0 auto}
  .rail-nav{flex:1 1 100%;order:3;min-height:0;overflow-x:auto;overflow-y:hidden;padding-bottom:3px}
  .rail-nav ul{flex-direction:row;gap:8px}
  .rl{white-space:nowrap;padding:9px 12px}
  .rail-cta{display:none}
  .stage{max-width:none;padding:14px 14px 32px}
  .topbar{position:static;padding:0 0 12px;background:none;backdrop-filter:none}
  .split{grid-template-columns:minmax(0,1fr);gap:20px}
  main{order:1}
  .side{position:static;order:2}
  .side-card{display:block}
  .side-list{flex-direction:row;flex-wrap:wrap;gap:4px 10px}
  .hero{min-height:0;padding:28px 18px 0;gap:18px}
  .hero-art img{max-height:38vh}
  .body{padding:8px 18px 36px}
  .foot{padding:30px 14px 20px}
  .foot-cols{grid-template-columns:minmax(0,1fr);gap:12px}
}

@media (max-width:420px){
  .hero-h1{font-size:1.8rem}
  .hero-sub,.body{font-size:16px}
  .foot-cta{padding:20px 16px}
}

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