@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&display=swap');

:root{
  --mint:#b4fde1;
  --sky:#add8e6;
  --ink:#172620;
  --mint-deep:#57d6aa;
  --sky-deep:#79b6d8;
  --paper:#effcf7;
  --glass:rgba(255,255,255,.64);
  --hair:rgba(23,38,32,.16);
  --soft:rgba(23,38,32,.70);
  --link:#0f6d54;
  --shadow-in:inset -3px -3px 10px rgba(255,255,255,.9), inset 3px 3px 10px rgba(23,38,32,.07);
  --shadow-out:6px 6px 0 rgba(23,38,32,.11), 0 16px 34px -22px rgba(23,38,32,.6);
}

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

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

body{
  margin:0;
  font-family:"IBM Plex Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.7;
  color:var(--ink);
  background:
    radial-gradient(84rem 42rem at 6% -12%, rgba(180,253,225,.88), transparent 62%),
    radial-gradient(66rem 40rem at 102% 6%, rgba(173,216,230,.80), transparent 64%),
    var(--paper);
  background-attachment:fixed;
  overflow-x:hidden;
}

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

h1,h2,h3{line-height:1.22;letter-spacing:-.01em;margin:0 0 12px}
h1{font-size:clamp(2.3rem,7vw,4.4rem);line-height:1.05;letter-spacing:-.025em;margin:0 0 18px}
h2{font-size:clamp(1.42rem,3vw,2rem)}
h3{font-size:1.12rem;margin-bottom:8px}

p{margin:0 0 14px;max-width:68ch}
main p:last-child{margin-bottom:0}

a{color:var(--link)}
main a{text-underline-offset:3px}

.subtitle{
  margin:0 0 18px;
  color:var(--soft);
  font-size:1.03rem;
  font-weight:500;
  max-width:60ch;
}
.muted{color:var(--soft);font-size:16px}

:focus-visible{outline:3px solid var(--mint-deep);outline-offset:3px}

/* —— 品牌角标 —— */
.corner-brand{
  position:fixed;
  top:14px;
  left:14px;
  z-index:80;
  width:56px;
  height:56px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:3px solid var(--ink);
  border-radius:50%;
  background:linear-gradient(140deg,#ffffff,var(--mint) 78%);
  box-shadow:0 4px 0 rgba(23,38,32,.8), var(--shadow-in);
  text-decoration:none;
  overflow:hidden;
  transition:transform .2s ease-out;
}
.corner-brand:hover{transform:translateY(-3px) rotate(-4deg)}
.corner-brand img{width:36px;height:36px;object-fit:contain}
.mark-glyph{font-size:22px;font-weight:700;color:var(--ink);letter-spacing:-.04em}

/* —— 外壳 —— */
.shell{
  max-width:1120px;
  margin:0 auto;
  padding:0 clamp(16px,4vw,40px) 148px;
}

/* —— 首屏 —— */
.hero{
  position:relative;
  min-height:100svh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:clamp(88px,14vh,132px) 0 clamp(64px,10vh,96px);
  text-align:left;
}
.kicker{
  margin:0 0 16px;
  font-size:16px;
  font-weight:500;
  letter-spacing:.14em;
  color:var(--soft);
}
.hero-lead{
  font-size:clamp(1.02rem,1.7vw,1.2rem);
  color:var(--soft);
  max-width:48ch;
  margin:0 0 26px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:0}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:11px 22px;
  border:3px solid var(--ink);
  border-radius:16px;
  background:linear-gradient(135deg,var(--mint),#e2fdf3);
  color:var(--ink);
  font-size:16px;
  font-weight:600;
  text-decoration:none;
  box-shadow:0 5px 0 rgba(23,38,32,.86), inset -2px -2px 8px rgba(255,255,255,.75);
  transition:transform .2s ease-out, box-shadow .2s ease-out;
}
.btn:hover{transform:translateY(-3px);box-shadow:0 8px 0 rgba(23,38,32,.86), inset -2px -2px 8px rgba(255,255,255,.75)}
.btn:active{transform:translateY(2px);box-shadow:0 2px 0 rgba(23,38,32,.86), inset -2px -2px 8px rgba(255,255,255,.75)}
.btn.line{background:rgba(255,255,255,.75)}

.hero-art{
  margin:clamp(28px,5vw,50px) 0 0;
  border:4px solid var(--ink);
  border-radius:28px;
  overflow:hidden;
  background:linear-gradient(135deg,#d4fdef,#d9edf8);
  box-shadow:var(--shadow-out), var(--shadow-in);
  aspect-ratio:16/7;
}
.hero-img{width:100%;height:100%;object-fit:cover}
.hero-fill{position:relative;width:100%;height:100%}
.hero-fill i{
  position:absolute;
  border-radius:50%;
  border:4px solid rgba(23,38,32,.35);
  background:radial-gradient(circle at 32% 28%, #ffffff, var(--sky));
  box-shadow:inset -4px -4px 12px rgba(23,38,32,.12), 6px 6px 0 rgba(23,38,32,.10);
}
.hero-fill i:nth-child(1){width:26%;padding-bottom:26%;left:8%;top:20%}
.hero-fill i:nth-child(2){width:38%;padding-bottom:38%;left:40%;top:8%;background:radial-gradient(circle at 30% 25%, #ffffff, var(--mint))}
.hero-fill i:nth-child(3){width:20%;padding-bottom:20%;right:9%;bottom:14%}
.hero-band{
  position:absolute;
  left:calc(50% - 50vw);
  right:calc(50% - 50vw);
  bottom:0;
  height:clamp(48px,7vw,84px);
  background:linear-gradient(90deg,var(--mint),var(--sky));
  clip-path:polygon(0 46%,100% 0,100% 100%,0 100%);
  z-index:-1;
}

/* —— 正文容器 —— */
main{display:block}

main > article{
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:3px solid var(--hair);
  border-radius:0;
  padding:clamp(20px,3.2vw,40px);
  box-shadow:var(--shadow-in), 6px 6px 0 rgba(23,38,32,.10);
}
main > article + article{margin-top:clamp(20px,3vw,32px)}

article[id]{scroll-margin-top:96px;scroll-margin-bottom:150px}

main h2{margin-top:0}
main ul,main ol{padding-left:1.25em;margin:0 0 16px}
main li{margin:0 0 8px}
main li:last-child{margin-bottom:0}
main figure{
  margin:20px 0;
  padding:0;
  border:3px solid var(--hair);
  border-radius:0;
  overflow:hidden;
  background:rgba(255,255,255,.55);
}
main figure img{width:100%}
main figcaption{
  padding:10px 14px;
  font-size:16px;
  color:var(--soft);
  border-top:3px solid var(--hair);
}
main blockquote{
  margin:20px 0;
  padding:14px 18px;
  border-left:6px solid var(--mint-deep);
  background:rgba(255,255,255,.6);
  color:var(--soft);
}
main table{width:100%;border-collapse:collapse;margin:18px 0;font-size:16px}
main th,main td{border:2px solid var(--hair);padding:10px 12px;text-align:left}
main th{background:rgba(180,253,225,.4);font-weight:600}

/* —— 概览区：内容 + 右侧栏 —— */
.overview{
  display:grid;
  grid-template-columns:minmax(0,1fr) 302px;
  gap:clamp(16px,2.4vw,26px);
  align-items:start;
  background:transparent;
  border:0;
  box-shadow:none;
  padding:0;
}
.overview .lead{
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:3px solid var(--hair);
  border-radius:0;
  padding:clamp(20px,3.2vw,36px);
  box-shadow:var(--shadow-in), 6px 6px 0 rgba(23,38,32,.10);
}
.side{
  position:sticky;
  top:88px;
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border:3px solid var(--hair);
  border-radius:0;
  padding:18px 16px;
  box-shadow:var(--shadow-in), 6px 6px 0 rgba(23,38,32,.10);
}
.side h2{font-size:1.06rem;margin:0 0 10px}
.side-list{list-style:none;margin:0;padding:0}
.side-list li{margin:0}
.side-list a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:10px 8px;
  border-bottom:2px dashed rgba(23,38,32,.18);
  color:var(--ink);
  text-decoration:none;
  font-size:16px;
  transition:padding-left .18s ease-out, color .18s ease-out;
}
.side-list li:last-child a{border-bottom:0}
.side-list a:hover{padding-left:15px;color:var(--link)}

/* —— 页脚 —— */
footer{
  margin-top:clamp(36px,6vw,64px);
  display:grid;
  grid-template-columns:1fr;
  gap:20px;
}
footer > article{
  border-radius:0;
  padding:clamp(20px,3vw,32px);
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:3px solid var(--hair);
  box-shadow:var(--shadow-in), 6px 6px 0 rgba(23,38,32,.10);
}
footer .cta{
  border:4px solid var(--ink);
  background:linear-gradient(135deg,var(--mint),var(--sky));
  box-shadow:inset -3px -3px 10px rgba(255,255,255,.75), 8px 8px 0 rgba(23,38,32,.16);
}
footer .cta h2{margin-bottom:8px}
footer .cta .subtitle{color:rgba(23,38,32,.76)}
.foot-brand .foot-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:52px;
  height:52px;
  border:3px solid var(--ink);
  border-radius:18px;
  background:linear-gradient(140deg,#ffffff,var(--mint));
  box-shadow:0 4px 0 rgba(23,38,32,.75), var(--shadow-in);
  margin-bottom:12px;
  overflow:hidden;
}
.foot-brand .foot-mark img{width:34px;height:34px;object-fit:contain}
.foot-name{font-weight:700;font-size:1.1rem;margin-bottom:6px}
.foot-links ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px 10px}
.foot-links a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:8px 14px;
  border:2px solid rgba(23,38,32,.22);
  border-radius:14px;
  background:rgba(255,255,255,.6);
  color:var(--ink);
  text-decoration:none;
  font-size:16px;
  transition:background .18s ease-out, transform .18s ease-out;
}
.foot-links a:hover{background:var(--mint);transform:translateY(-2px)}
.foot-legal{text-align:center}
.foot-legal p{margin:0 auto 6px;max-width:52ch}

/* —— 底部固定导航 —— */
.dock{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:90;
  background:rgba(255,255,255,.82);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-top:3px solid var(--ink);
  border-radius:20px 20px 0 0;
  padding:8px 8px calc(8px + env(safe-area-inset-bottom, 0px));
  box-shadow:0 -6px 0 rgba(23,38,32,.09), inset 0 3px 10px rgba(255,255,255,.9);
}
.dock nav ul{
  display:flex;
  gap:6px;
  margin:0;
  padding:0 2px 2px;
  list-style:none;
  overflow-x:auto;
  scrollbar-width:none;
  scroll-snap-type:x proximity;
}
.dock nav ul::-webkit-scrollbar{display:none}
.dock li{margin:0;flex:0 0 auto}
.dock a{
  display:inline-flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  padding:10px 13px;
  border:3px solid transparent;
  border-radius:14px;
  color:var(--ink);
  text-decoration:none;
  font-size:16px;
  font-weight:500;
  white-space:nowrap;
  scroll-snap-align:center;
  transition:transform .18s ease-out, background .18s ease-out, border-color .18s ease-out;
}
.dock a:hover{background:var(--mint);border-color:var(--ink);transform:translateY(-2px)}
.dock a[aria-current="true"]{
  background:linear-gradient(135deg,var(--mint),#e3fdf4);
  border-color:var(--ink);
  box-shadow:0 3px 0 rgba(23,38,32,.6), inset -2px -2px 8px rgba(255,255,255,.8);
}
.pip{
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--sky-deep);
  box-shadow:inset -1px -1px 2px rgba(255,255,255,.85);
  flex:0 0 auto;
}
.dock a:hover .pip,.dock a[aria-current="true"] .pip{background:var(--mint-deep)}

/* —— 出场动效 —— */
.js-reveal .reveal{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .5s ease-out, transform .6s cubic-bezier(.34,1.56,.64,1);
}
.js-reveal .reveal.is-in{opacity:1;transform:none}

/* —— 断点 —— */
@media (min-width:860px){
  footer{grid-template-columns:1fr 1fr}
  footer .cta,footer .foot-legal{grid-column:1 / -1}
  .dock{
    left:50%;
    right:auto;
    transform:translateX(-50%);
    bottom:18px;
    max-width:min(96vw,980px);
    border:3px solid var(--ink);
    border-radius:24px;
    padding:8px 10px;
    box-shadow:0 -8px 0 rgba(23,38,32,.09), 0 20px 40px -22px rgba(23,38,32,.65), inset 0 3px 10px rgba(255,255,255,.9);
  }
  .dock nav ul{overflow:visible;padding-bottom:0}
}

@media (max-width:859px){
  .overview{grid-template-columns:minmax(0,1fr)}
  .side{position:static}
  .hero-art{aspect-ratio:4/3;border-radius:22px}
  .hero-band{height:40px}
  .foot-legal{text-align:left}
  .foot-legal p{margin-left:0}
}

@media (max-width:430px){
  .kicker{font-size:16px;letter-spacing:.08em}
  .hero-art{aspect-ratio:5/4}
  .foot-links a{padding:8px 12px}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .js-reveal .reveal{opacity:1;transform:none;transition:none}
  .btn,.dock a,.side-list a,.foot-links a,.corner-brand{transition:none}
}

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