/* GreenGrass 2.0.0 · support 站样式（顶栏/底栏为全站共同部分） */
:root{
  --blue:#0071e3;
  --text:#1d1d1f;
  --text-2:#6e6e73;
  --bg:#ffffff;
  --panel:#f5f5f7;
  --line:#d2d2d7;
  --bar-bg:rgba(251,251,253,.8);
  --bar-line:rgba(0,0,0,.1);
  --flyout-bg:#fafafc;
}
@media (prefers-color-scheme: dark){
  :root{
    --text:#f5f5f7;
    --text-2:#86868b;
    --bg:#000000;
    --panel:#161617;
    --line:#38383d;
    --bar-bg:rgba(29,29,31,.8);
    --bar-line:rgba(255,255,255,.12);
    --flyout-bg:#161617;
  }
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro SC","PingFang SC","Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}

/* ================= 顶栏 ================= */
#nav{position:sticky;top:0;z-index:100;background:var(--bar-bg);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--bar-line)}

/* 顶栏颜色与页面第一个区块统一：深色页 body 加 nav-dark，浅灰页加 nav-panel，默认白色 */
body.nav-dark #nav{--text:#f5f5f7;--text-2:#86868b;--bar-bg:#1d1d1f;--bar-line:rgba(255,255,255,.14);--flyout-bg:#1d1d1f}
body.nav-panel #nav{--bar-bg:var(--panel);--bar-line:var(--line);--flyout-bg:var(--panel)}
body.nav-dark #nav,body.nav-panel #nav{border-bottom-color:transparent}
/* 同色无缝只在首屏：滚动后补回底线 */
body.scrolled #nav{border-bottom-color:var(--bar-line)}
.nav-inner{position:relative;max-width:1024px;margin:0 auto;padding:0 22px;height:48px;display:flex;align-items:center}

.logo{display:flex;align-items:center;gap:7px;font-weight:700;font-size:16px;letter-spacing:-.02em;color:var(--text);white-space:nowrap}
.logo-img{width:20px;height:20px;border-radius:5px;object-fit:cover;display:block}

.links{position:absolute;left:50%;transform:translateX(-50%);display:flex;gap:2px}
.links a{font-size:12px;font-weight:400;letter-spacing:.01em;color:var(--text);opacity:.8;padding:5px 12px;border-radius:6px;white-space:nowrap;transition:opacity .15s}
.links a:hover{opacity:1}
.links a.on{opacity:1;font-weight:600}

.nav-right{margin-left:auto;display:flex;align-items:center}
.search-btn{width:28px;height:28px;border:0;background:none;color:var(--text);cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:.8}
.search-btn:hover{opacity:1}

.logo,.links{transition:opacity .22s ease,transform .22s ease}
#nav.searching .logo,#nav.searching .links{opacity:0;transform:scale(.96);pointer-events:none}

.expand{position:absolute;top:100%;left:0;right:0;overflow:hidden;max-height:0;opacity:0;background:var(--flyout-bg);border-bottom:1px solid transparent;transition:max-height .32s cubic-bezier(.4,0,.6,1),opacity .22s ease,border-color .32s ease}
#nav.expanded .expand{max-height:480px;opacity:1;border-bottom-color:var(--bar-line)}
.expand-inner{max-width:1024px;margin:0 auto;padding:44px 22px 84px}
.expand-title{font-size:12px;color:var(--text-2);margin-bottom:18px}

.expand-cols{display:flex;gap:88px}
.expand-big{display:flex;flex-direction:column}
.expand-big a{font-size:24px;font-weight:600;line-height:1.3;color:var(--text);padding:7px 0;opacity:0;transform:translateY(-8px);transition:opacity .32s cubic-bezier(.4,0,.6,1),transform .32s cubic-bezier(.4,0,.6,1)}
.expand-big a:hover{color:var(--blue)}
.expand-side{display:flex;gap:56px;flex-shrink:0}
.expand-group .t{font-size:12px;color:var(--text-2);margin-bottom:10px}
.expand-group a{display:block;font-size:12px;color:var(--text);padding:4px 0;opacity:0;transform:translateY(-8px);transition:opacity .32s cubic-bezier(.4,0,.6,1),transform .32s cubic-bezier(.4,0,.6,1)}
.expand-group a:hover{color:var(--blue)}
#nav.expanded .expand-big a,#nav.expanded .expand-group a{opacity:1;transform:none}
#nav.expanded .expand-big a:nth-child(1){transition-delay:.09s}
#nav.expanded .expand-big a:nth-child(2){transition-delay:.11s}
#nav.expanded .expand-big a:nth-child(3){transition-delay:.13s}
#nav.expanded .expand-big a:nth-child(4){transition-delay:.15s}
#nav.expanded .expand-big a:nth-child(5){transition-delay:.17s}
#nav.expanded .expand-big a:nth-child(6){transition-delay:.19s}
#nav.expanded .expand-big a:nth-child(7){transition-delay:.21s}
#nav.expanded .expand-group a{transition-delay:.13s}

.searchform{display:flex;align-items:center;gap:10px;margin:0 0 30px}
.searchform .sic{color:var(--text-2);display:flex;flex-shrink:0}
.searchform input{flex:1;border:0;background:transparent;font-size:28px;font-weight:500;color:var(--text);outline:none;padding:6px 0}
.searchform input::placeholder{color:var(--text-2)}
.searchform .sclose{border:0;background:none;color:var(--text-2);font-size:15px;cursor:pointer;padding:6px;flex-shrink:0}
.searchform .sclose:hover{color:var(--text)}
.quick-list{display:flex;flex-direction:column}
.quick-list a{font-size:12px;color:var(--text);padding:4px 0}
.quick-list a:hover{color:var(--blue)}

body.curtain::after{content:"";position:fixed;inset:0;z-index:90;background:rgba(0,0,0,.32);animation:fadeIn .25s ease}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* ================= 底栏 ================= */
#footer{margin-top:64px;background:var(--panel);border-top:1px solid var(--line)}
.foot-cols{max-width:980px;margin:0 auto;padding:36px 22px 8px;display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:24px}
.foot-cols .t{font-size:12px;font-weight:600;color:var(--text-2);margin-bottom:8px}
.foot-cols a{display:block;font-size:13px;color:var(--text);opacity:.8;padding:3px 0}
.foot-cols a:hover{opacity:1;color:var(--blue)}
.foot-base{max-width:980px;margin:20px auto 0;padding:18px 22px 40px;color:var(--text-2);font-size:12.5px;border-top:1px solid var(--line)}

/* 脚注：底栏最上方，灰底小字，下方细分隔线 */
.foot-notes{max-width:980px;margin:0 auto;padding:20px 22px 14px;border-bottom:1px solid var(--line);font-size:14px;line-height:1.5;color:var(--text-2)}
.foot-notes ul{list-style:none}
.foot-notes li{margin-bottom:4px}

/* ================= 本页内容 ================= */
.hero{background:var(--panel);text-align:center;padding:84px 22px 64px}
.hero h1{font-size:40px;font-weight:700;letter-spacing:-.8px}
.hero-search{max-width:520px;margin:28px auto 0;display:flex}
.hero-search input{flex:1;padding:12px 18px;border:1px solid var(--line);border-radius:980px;font-size:15px;background:var(--bg);color:var(--text);outline:none}
.hero-search input:focus{border-color:var(--blue)}

.wrap{max-width:980px;margin:0 auto;padding:0 22px}
.wrap h2{font-size:28px;margin:56px 0 20px}

.contact-line{text-align:center}

@media(max-width:760px){
  .logo span{display:none}/* 窄屏只留 logo 图标 */
  .expand-inner{padding:28px 20px 48px}
  .expand-cols{flex-direction:column;gap:24px}
  .expand-big a{font-size:20px}
  .searchform input{font-size:22px}
  .hero h1{font-size:30px}
  .nav-inner{overflow-x:auto}
}

/* 滚动浮现 */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){.reveal{opacity:1;transform:none;transition:none}}