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

:root{
  --ink:#171f26;
  --ink2:#54636e;
  --blue:#c8e0f4;
  --pink:#f5e0e8;
  --line:rgba(23,31,38,.16);
  --out:-6px -6px 14px rgba(255,255,255,.92), 6px 6px 16px rgba(23,31,38,.13);
  --out-s:-3px -3px 8px rgba(255,255,255,.9), 3px 3px 9px rgba(23,31,38,.11);
  --in:inset -3px -3px 8px rgba(255,255,255,.9), inset 3px 3px 9px rgba(23,31,38,.16);
  --r:16px;
  --card:28px;
}

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

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

body{
  margin:0;
  min-height:100vh;
  font-size:17px;
  line-height:1.7;
  color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:linear-gradient(165deg,#f8fbfe 0%,#eaf1f8 44%,#f7edf2 100%);
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,.brand .name,.foot-brand,.hero-big{
  font-family:"Space Grotesk",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  font-weight:700;
  letter-spacing:-.02em;
}

a{color:inherit}
img{max-width:100%;height:auto}
p{margin:0}
:focus-visible{outline:3px solid #7ba7c9;outline-offset:3px}

.wrap{width:100%;max-width:1160px;margin:0 auto;padding:0 20px}

/* ---------- 顶部两行 ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:30;
  background:rgba(245,249,252,.9);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(255,255,255,.85);
  box-shadow:0 6px 18px rgba(23,31,38,.07);
}

.brandrow{display:flex;align-items:center;padding-top:10px;padding-bottom:6px}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:6px 16px;
  border-radius:var(--r);
  text-decoration:none;
  color:var(--ink);
  background:linear-gradient(145deg,#f9fcfe,#dde9f4);
  box-shadow:var(--out);
  transition:transform .15s ease, box-shadow .15s ease;
}
.brand:active{box-shadow:var(--in);transform:scale(.98)}

.brand .mark{
  display:inline-grid;
  place-items:center;
  width:30px;
  height:30px;
  border-radius:10px;
  font-size:16px;
  background:linear-gradient(145deg,#f7e6ee,#e7cfdb);
  box-shadow:var(--out-s);
}
.brand .name{font-size:18px}

.menuroll{padding-bottom:12px}

summary{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:8px 20px;
  border-radius:999px;
  cursor:pointer;
  font-size:16px;
  list-style:none;
  background:linear-gradient(145deg,#f9fcfe,#dbe8f4);
  box-shadow:var(--out);
  transition:box-shadow .15s ease, transform .15s ease;
}
summary::-webkit-details-marker{display:none}
summary:active{box-shadow:var(--in);transform:scale(.98)}
summary::after{
  content:"";
  width:8px;height:8px;
  border-right:2px solid var(--ink2);
  border-bottom:2px solid var(--ink2);
  transform:rotate(45deg) translateY(-2px);
  transition:transform .2s ease;
}
details.menu[open] > summary::after{transform:rotate(-135deg) translateY(-2px)}

menu.pills,menu.jumps{list-style:none;margin:0;padding:0}

menu.pills{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
menu.pills a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 16px;
  border-radius:999px;
  text-decoration:none;
  font-size:16px;
  background:linear-gradient(145deg,#fafcfe,#e3edf6);
  box-shadow:var(--out-s);
  transition:transform .15s ease, box-shadow .15s ease;
}
menu.pills a:hover{transform:translateY(-1px)}
menu.pills a:active{box-shadow:var(--in);transform:scale(.97)}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  overflow:hidden;
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,.8fr);
  gap:28px;
  align-items:center;
  min-height:45vh;
  padding:34px 0 46px;
}

.hero-big{
  position:absolute;
  left:-.04em;
  top:-.12em;
  z-index:0;
  font-size:clamp(3rem,13vw,8.6rem);
  line-height:.86;
  letter-spacing:-.05em;
  color:transparent;
  -webkit-text-stroke:2px rgba(23,31,38,.14);
  white-space:nowrap;
  pointer-events:none;
  user-select:none;
  will-change:transform;
}

.hero-copy{position:relative;z-index:2}
.hero-copy h1{margin:0;font-size:clamp(2rem,6.4vw,4rem);line-height:1.06}

.cta{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 0}
.cta .pill{
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:11px 22px;
  border-radius:999px;
  text-decoration:none;
  font-weight:700;
  font-size:16px;
  background:linear-gradient(145deg,#f8fbfe,#d7e6f3);
  box-shadow:var(--out);
  transition:transform .15s ease, box-shadow .15s ease;
}
.cta .pill.alt{background:linear-gradient(145deg,#fdf8fb,#f0dae6)}
.cta .pill:hover{transform:translateY(-2px)}
.cta .pill:active{box-shadow:var(--in);transform:scale(.97)}

.collage{position:relative;z-index:1;min-height:240px}
.collage .pic{
  margin:0;
  border-radius:var(--card);
  overflow:hidden;
  border:1px solid rgba(255,255,255,.9);
  box-shadow:0 16px 34px rgba(23,31,38,.13);
}
.collage .p1{width:78%;transform:rotate(-2deg)}
.collage .p2{position:absolute;right:0;bottom:-20px;width:62%;transform:rotate(2.5deg)}
.collage img{display:block;width:100%}

.plate{
  position:absolute;
  border-radius:var(--card);
  box-shadow:0 14px 30px rgba(23,31,38,.12);
}
.plate.p1{left:0;top:8%;width:74%;height:64%;background:linear-gradient(145deg,#dbeaf7,#f7dfe9);transform:rotate(-2deg)}
.plate.p2{right:0;bottom:0;width:58%;height:52%;background:linear-gradient(145deg,#f7dfe9,#dbeaf7);transform:rotate(3deg)}

/* ---------- 正文 + 右侧栏 ---------- */
main{display:block;padding-bottom:40px}

.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:34px;align-items:start}

.doc{min-width:0;overflow-wrap:break-word}

.doc > article{
  border:1px solid var(--line);
  border-radius:var(--card);
  padding:24px;
  margin:0 0 22px;
  background:linear-gradient(160deg,#fafcfe,#eef4f9);
  scroll-margin-top:132px;
}

.doc h2{font-size:clamp(1.35rem,2.6vw,1.8rem);line-height:1.24;margin:0 0 12px}
.doc h3{font-size:1.18rem;line-height:1.35;margin:22px 0 8px}
.doc p{margin:0 0 14px}
.doc ul,.doc ol{margin:0 0 14px;padding-left:1.25em}
.doc li{margin:0 0 6px}
.doc a{color:#1d4d70;text-decoration:underline;text-underline-offset:3px}
.doc strong{font-weight:700}
.doc blockquote{
  margin:0 0 16px;
  padding:12px 18px;
  border-left:4px solid var(--blue);
  border-radius:0 16px 16px 0;
  background:#f4f9fd;
}
.doc img{display:block;margin:0 0 14px;border-radius:18px}

.doc > article.reveal{opacity:0;transform:translateY(16px);transition:opacity .55s ease, transform .55s ease}
.doc > article.reveal.in{opacity:1;transform:none}

.side{
  position:sticky;
  top:132px;
  border:1px solid var(--line);
  border-radius:var(--card);
  padding:22px;
  background:linear-gradient(160deg,#fdf8fb,#f2e6ee);
}
.side h2{font-size:1.15rem;margin:0 0 6px}
.side .subtitle{margin:0 0 16px;font-size:16px;line-height:1.6;color:var(--ink2)}

menu.jumps{display:grid;gap:8px}
menu.jumps a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:8px 14px;
  border-radius:var(--r);
  text-decoration:none;
  font-size:16px;
  background:linear-gradient(145deg,#fdfbfd,#efe2ea);
  box-shadow:var(--out-s);
  animation:rise .5s ease both;
  transition:transform .15s ease, box-shadow .15s ease;
}
menu.jumps li:nth-child(1) a{animation-delay:.03s}
menu.jumps li:nth-child(2) a{animation-delay:.07s}
menu.jumps li:nth-child(3) a{animation-delay:.11s}
menu.jumps li:nth-child(4) a{animation-delay:.15s}
menu.jumps li:nth-child(5) a{animation-delay:.19s}
menu.jumps li:nth-child(6) a{animation-delay:.23s}
menu.jumps li:nth-child(7) a{animation-delay:.27s}
menu.jumps a:hover{transform:translateY(-1px);box-shadow:var(--out)}
menu.jumps a:active{box-shadow:var(--in);transform:scale(.98)}

@keyframes rise{
  from{opacity:0;transform:translateY(10px)}
  to{opacity:1;transform:none}
}

/* ---------- 四栏页脚 ---------- */
.foot{
  margin-top:56px;
  padding:44px 0 26px;
  background:linear-gradient(165deg,#eff4f9,#e6ecf4);
  border-top:1px solid rgba(255,255,255,.9);
  box-shadow:inset 0 10px 22px rgba(255,255,255,.75);
}

.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:20px}

.foot address{font-style:normal;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.foot .mark{
  display:inline-grid;
  place-items:center;
  width:32px;
  height:32px;
  border-radius:11px;
  background:linear-gradient(145deg,#f7e6ee,#e6cedb);
  box-shadow:var(--out-s);
}
.foot-brand{font-size:17px}

.foot-list{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.foot-list a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:2px 0;
  font-size:16px;
  text-decoration:none;
  color:var(--ink2);
}
.foot-list a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}

.copyright{text-align:center;margin:34px 0 0;font-size:16px;color:var(--ink2)}

/* ---------- 断点 ---------- */
@media (max-width:860px){
  .hero{grid-template-columns:1fr;min-height:0;gap:30px;padding:26px 0 24px}
  .hero-big{font-size:clamp(3rem,17vw,5.5rem);top:-.1em}
  .collage{min-height:190px;margin-bottom:8px}
  .layout{grid-template-columns:1fr;gap:24px}
  .side{position:static}
  .doc > article{padding:20px;border-radius:22px;scroll-margin-top:142px}
  .foot-grid{grid-template-columns:1fr 1fr;gap:16px}
}

@media (max-width:420px){
  .foot-grid{grid-template-columns:1fr}
  .doc > article{padding:18px}
  .cta .pill{flex:1 1 auto;justify-content:center}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-delay:0ms !important;
    transition-duration:.001ms !important;
  }
  .hero-big{transform:none !important}
}

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