/* ============================================================
   Lantu Bio v2 Shared System (common-v2.css)
   与新首页同源：导航 / 页脚 / 主题 / 组件 / 动效
   ============================================================ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;color:#15271F;background:#fff;line-height:1.65;overflow-x:hidden;-webkit-font-smoothing:antialiased}
body.en{font-family:-apple-system,"Inter","Segoe UI","Helvetica Neue",Arial,sans-serif}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
:root{
  --ink:#0C231A;--green:#0E5B3A;--green-deep:#083822;--green-mid:#1A8A5C;--green-pale:#E9F2ED;
  --gold:#D4A84B;--gold-soft:#E9CF96;--paper:#FAFBF9;--line:#E3EBE6;--muted:#5E7369;
}
.container{max-width:1240px;margin:0 auto;padding:0 28px}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:.72rem;font-weight:700;letter-spacing:.28em;text-transform:uppercase;color:var(--gold)}
.eyebrow::before{content:'';width:26px;height:1px;background:var(--gold)}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:100px;padding:13px 26px;font-size:.92rem;font-weight:600;transition:all .25s;cursor:pointer;border:1px solid transparent}
.btn-gold{background:var(--gold);color:#0C231A}
.btn-gold:hover{background:#E2B75F;transform:translateY(-2px)}
.btn-ghost{border-color:rgba(255,255,255,.55);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-line{border-color:var(--green);color:var(--green-deep)}
.btn-line:hover{background:var(--green);color:#fff}
.arrow{transition:transform .25s}
.btn:hover .arrow{transform:translateX(4px)}

/* ===== Nav ===== */
nav{position:fixed;top:0;left:0;right:0;z-index:200;transition:background .3s,box-shadow .3s;padding:0 28px}
nav .bar{max-width:1240px;margin:0 auto;display:flex;align-items:center;gap:20px;height:76px}
nav.scrolled{background:rgba(5,38,24,.96);backdrop-filter:blur(12px);box-shadow:0 1px 20px rgba(12,35,26,.22)}
nav.scrolled .bar{height:64px}
.wd{display:flex;flex-direction:column;line-height:1.1}
.wd b{font-size:1.22rem;font-weight:800;letter-spacing:.02em;color:#fff;transition:color .3s}
.wd span{font-size:.6rem;font-weight:700;letter-spacing:.34em;color:var(--gold);text-transform:uppercase}
nav.scrolled .wd b{color:#fff}
.lg{display:flex;align-items:center;height:48px;padding:7px 14px;background:#fff;border-radius:12px;box-shadow:0 2px 16px rgba(2,12,7,.28);flex:none}
.lg img{height:32px;width:auto;display:block}
.nlk{display:flex;align-items:center;gap:12px;margin-left:auto;padding:0;list-style:none}
.nlk>li>a,.dd>a{position:relative;padding:9px 10px;font-size:.88rem;font-weight:700;color:#fff!important;border-radius:8px;transition:color .25s;white-space:nowrap;text-shadow:0 1px 12px rgba(2,12,7,.95),0 2px 26px rgba(2,12,7,.55)}
nav{background:linear-gradient(180deg,rgba(4,20,12,.82),rgba(4,20,12,.4) 55%,rgba(4,20,12,0))}
nav.scrolled .nlk>li>a,nav.scrolled .dd>a{color:#fff}
.nlk>li>a:hover,.dd>a:hover{color:var(--gold)!important}
.dd{position:relative}
.dd .m{display:none;position:absolute;top:calc(100% + 6px);left:0;min-width:240px;background:#fff;border-radius:14px;box-shadow:0 18px 50px rgba(12,35,26,.16);padding:10px;border:1px solid var(--line)}
.dd .m a{display:block;padding:11px 16px;border-radius:9px;color:#23372E;font-size:.9rem}
.dd .m a b{display:block;font-size:.93rem;color:var(--green-deep);font-weight:600}
.dd .m a small{color:var(--muted);font-size:.76rem}
.dd .m a:hover{background:var(--green-pale)}
.dd:hover .m,.dd.open .m{display:block}
.dd .caret{font-size:.55rem;opacity:.7;margin-left:3px}
.nr{display:flex;align-items:center;gap:14px}
.ls{display:flex;gap:2px;border:1px solid rgba(255,255,255,.5);border-radius:100px;padding:3px}
nav.scrolled .ls{border-color:rgba(255,255,255,.4)}
.ls span{font-size:.72rem;padding:4px 11px;border-radius:100px;cursor:pointer;color:rgba(255,255,255,.8)}
nav.scrolled .ls span{color:rgba(255,255,255,.8)}
.ls span.active{background:#fff;color:var(--green-deep);font-weight:700}
nav.scrolled .ls span.active{background:#fff;color:var(--green-deep)}
.nbtn{font-size:.84rem;padding:9px 20px}
.nt{display:none;margin-left:10px;background:none;border:0;cursor:pointer;flex-direction:column;gap:5px;padding:6px}
.nt span{width:24px;height:2px;background:#fff;transition:.3s;border-radius:2px}
nav.scrolled .nt span{background:#fff}
@media(max-width:1360px){
  .nt{display:flex}
  .nlk{position:fixed;top:0;right:-320px;width:300px;height:100vh;background:#08381F;flex-direction:column;align-items:flex-start;padding:96px 30px 40px;gap:6px;transition:right .3s;margin:0;display:flex}
  .nlk.op{right:0}
  .nlk>li>a,.dd>a{color:#fff!important;width:100%;font-size:1.02rem;padding:12px 6px}
  .dd{width:100%}
  .dd .m{position:static;display:none;background:rgba(255,255,255,.08);border:0;box-shadow:none;padding:4px 10px}
  .dd.open .m{display:block}
  .dd .m a{color:#EAF3EE;padding:10px 12px}
  .dd .m a b{color:#fff}
  .dd .m a small{color:#B9CDC2}
  .nr{margin-left:auto}
  .nbtn{display:none}
  .lg{height:42px;padding:6px 10px;border-radius:10px}
  .lg img{height:28px}
}
@media(max-width:1360px){nav{background:linear-gradient(rgba(8,48,30,.75),rgba(8,48,30,0))}}

/* ===== Page Hero (二级页首屏) ===== */
.phero{position:relative;min-height:52vh;display:flex;align-items:flex-end;overflow:hidden;color:#fff}
.phero .bg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.03)}
.phero::after{content:'';position:absolute;inset:0;z-index:1;background:
 linear-gradient(100deg,rgba(4,26,15,.86) 0%,rgba(4,26,15,.58) 40%,rgba(4,26,15,.30) 75%,rgba(4,26,15,.5) 100%),
 linear-gradient(0deg,rgba(3,20,12,.55) 0%,rgba(3,20,12,0) 40%)}
.phero .inner{position:relative;z-index:3;max-width:1240px;margin:0 auto;padding:150px 28px 74px;width:100%}
.phero .crumb{font-size:.72rem;letter-spacing:.22em;color:rgba(255,255,255,.6);margin-bottom:14px;text-transform:uppercase}
.phero h1{font-size:clamp(2.2rem,4.6vw,3.9rem);line-height:1.16;font-weight:800;max-width:860px;letter-spacing:.01em;text-shadow:0 2px 20px rgba(4,24,15,.5)}
.phero h1 em{font-style:normal;background:linear-gradient(120deg,#F0DCA2,var(--gold));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.phero .sub{max-width:660px;color:rgba(255,255,255,.82);font-size:clamp(.95rem,1.1vw,1.08rem);line-height:1.9;margin-top:18px;text-shadow:0 1px 12px rgba(4,24,15,.6);text-wrap:balance}
.phero .acts{display:flex;gap:14px;flex-wrap:wrap;margin-top:32px}
@media(max-width:768px){.phero{min-height:58vh}.phero .inner{padding:130px 22px 60px}}

/* ===== Section frames ===== */
.sec{padding:110px 0}
.sec-head{margin-bottom:54px;max-width:760px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-head.center .eyebrow::before{display:none}
.sec-head h2{font-size:clamp(1.9rem,3.6vw,3rem);font-weight:800;color:var(--green-deep);margin:16px 0 16px;line-height:1.22}
.sec-head p{color:var(--muted);font-size:1rem;line-height:1.9}
.sec-head.center p{margin:0 auto}
.section-label{font-size:.72rem;font-weight:700;letter-spacing:.28em;color:var(--gold);text-transform:uppercase}

/* Dark science band */
.sci{background:linear-gradient(150deg,#062E1C,#0A4628 70%,#0E5B3A);color:#fff;position:relative;overflow:hidden}
.sci::before{content:'';position:absolute;width:640px;height:640px;border-radius:50%;right:-220px;top:-220px;background:radial-gradient(circle,rgba(212,168,75,.16),transparent 65%)}
.sci .sec-head h2{color:#fff}
.sci .sec-head p{color:rgba(255,255,255,.62)}
.sci h2 em{font-style:normal;color:var(--gold-soft)}
.tgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;position:relative}
.tc{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:20px;padding:34px 30px;backdrop-filter:blur(4px);transition:transform .3s,background .3s}
.tc:hover{background:rgba(255,255,255,.09);transform:translateY(-6px)}
.tc .n{font-size:2.2rem;font-weight:800;color:rgba(212,168,75,.5);line-height:1;font-family:Georgia,serif}
.tc h3{font-size:1.16rem;font-weight:700;margin:16px 0 10px}
.tc p{font-size:.85rem;color:rgba(255,255,255,.72);line-height:1.85}
.tc .tg{display:flex;gap:8px;margin-top:16px;flex-wrap:wrap}
.tc .tg span{font-size:.68rem;padding:3px 11px;border-radius:100px;border:1px solid rgba(255,255,255,.25);color:var(--gold-soft)}
@media(max-width:900px){.tgrid{grid-template-columns:1fr}}
.chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:44px;justify-content:center}
.chip{font-size:.8rem;color:#EAF3EE;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);padding:9px 18px;border-radius:100px}
.chip b{color:var(--gold-soft);font-weight:800}

/* Impact stats */
.im2{background:#fff}
.statrow{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;border-top:1px solid var(--line);padding-top:60px}
.st b{font-size:clamp(2.4rem,4.6vw,3.8rem);font-weight:800;color:var(--green-deep);line-height:1;display:block;letter-spacing:-.01em}
.st b i{font-style:normal;color:var(--gold)}
.st .lbl{font-size:.92rem;font-weight:600;color:var(--ink);margin:14px 0 6px}
.st .dsc{font-size:.8rem;color:var(--muted);line-height:1.7}
@media(max-width:900px){.statrow{grid-template-columns:1fr 1fr;gap:34px 20px}}

/* Big link cards (hub) */
.hubgrid{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.hubcard{position:relative;border-radius:22px;overflow:hidden;min-height:460px;display:flex;align-items:flex-end;color:#fff;isolation:isolate}
.hubcard .pi{position:absolute;inset:0;background-size:cover;background-position:center;z-index:-2;transition:transform .8s}
.hubcard::before{content:'';position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(8,40,25,.05) 30%,rgba(6,32,20,.94) 100%);transition:background .4s}
.hubcard:hover .pi{transform:scale(1.06)}
.hubcard .pc{padding:38px 34px 32px;width:100%}
.hubcard .num{font-size:.74rem;letter-spacing:.26em;color:var(--gold-soft);font-weight:700}
.hubcard h3{font-size:1.7rem;font-weight:800;margin:10px 0 12px}
.hubcard p{font-size:.92rem;color:rgba(255,255,255,.8);line-height:1.8;max-width:96%}
.hubcard .kv{display:flex;gap:26px;margin-top:18px;flex-wrap:wrap}
.hubcard .kv div b{display:block;font-size:1.3rem;font-weight:800;color:var(--gold-soft)}
.hubcard .kv div span{font-size:.74rem;color:rgba(255,255,255,.65)}
.hubcard .more{display:inline-flex;align-items:center;gap:8px;margin-top:20px;font-size:.9rem;font-weight:600;color:var(--gold-soft)}
@media(max-width:960px){.hubgrid{grid-template-columns:1fr}}
@media(max-width:900px){.hubcard{min-height:400px}}

/* Solution list cards */
.split{display:grid;grid-template-columns:1fr 1.15fr;gap:70px;align-items:center}
.split .sticky .hl{font-size:.8rem;font-weight:700;letter-spacing:.2em;color:var(--green);margin-bottom:18px}
.sol{background:var(--paper);border:1px solid var(--line);border-radius:22px;overflow:hidden;transition:box-shadow .3s,transform .3s;margin-bottom:26px;display:flex}
.sol:hover{box-shadow:0 24px 60px rgba(12,45,28,.10);transform:translateY(-4px)}
.sol .si{width:210px;min-height:230px;background-size:cover;background-position:center;position:relative;flex-shrink:0}
.sol .sb{padding:26px 28px}
.sol .tag{display:inline-block;font-size:.66rem;font-weight:700;letter-spacing:.12em;padding:4px 12px;border-radius:100px;margin-bottom:12px}
.t-pet{background:#E3F3EA;color:var(--green)}
.t-live{background:#F6ECDC;color:#9A7426}
.sol h3{font-size:1.28rem;color:var(--green-deep);font-weight:800;margin-bottom:8px}
.sol p{font-size:.86rem;color:var(--muted);line-height:1.8}
.sol .kv{display:flex;gap:26px;margin-top:16px;flex-wrap:wrap}
.sol .kv div b{display:block;font-size:1.18rem;font-weight:800;color:var(--green)}
.sol .kv div span{font-size:.72rem;color:#879A8F}
@media(max-width:960px){.split{grid-template-columns:1fr}.sol{flex-direction:column}.sol .si{width:100%;min-height:190px}}

/* Paper cards grid (generic) */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:var(--paper);border:1px solid var(--line);border-radius:20px;padding:32px 30px;transition:transform .3s,box-shadow .3s}
.card:hover{transform:translateY(-5px);box-shadow:0 20px 50px rgba(12,45,28,.1)}
.card .n{font-size:2rem;font-weight:800;color:rgba(212,168,75,.65);line-height:1;font-family:Georgia,serif}
.card h3{font-size:1.14rem;font-weight:800;color:var(--green-deep);margin:14px 0 10px}
.card p{font-size:.85rem;color:var(--muted);line-height:1.8}
.card .tg{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap}
.card .tg span{font-size:.66rem;padding:3px 11px;border-radius:100px;border:1px solid var(--line);color:var(--green)}
@media(max-width:960px){.cards{grid-template-columns:1fr}}

/* Story / text block */
.story{max-width:800px;margin:0 auto;text-align:center}
.story p{color:var(--muted);font-size:.98rem;line-height:2;margin-bottom:16px}
.story .lead{font-size:1.12rem;color:var(--ink);font-weight:600;margin-bottom:20px}

/* IP list */
.iplist{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:960px;margin:0 auto}
.ip-item{display:flex;align-items:center;gap:14px;padding:15px 18px;border-radius:14px;border:1px solid var(--line);background:#fff;font-size:.85rem}
.ip-item .type-badge{background:var(--green-pale);color:var(--green);padding:3px 12px;border-radius:100px;font-size:.65rem;font-weight:600;white-space:nowrap;flex-shrink:0}
.ip-item span:last-child{color:var(--muted);line-height:1.55}
@media(max-width:720px){.iplist{grid-template-columns:1fr}}

/* CTA band */
.cta2{position:relative;overflow:hidden;padding:130px 0;color:#fff;text-align:center}
.cta2 .bg{position:absolute;inset:0;background:url('./bg-leaf.jpg') center/cover no-repeat;transform:scale(1.03)}
.cta2::before{content:'';position:absolute;inset:0;background:linear-gradient(120deg,rgba(6,38,23,.94),rgba(10,70,42,.86))}
.cta2 .inner{position:relative;z-index:2}
.cta2 h2{font-size:clamp(1.9rem,3.8vw,3.1rem);font-weight:800;max-width:760px;margin:0 auto 18px;line-height:1.25}
.cta2 p{color:rgba(255,255,255,.72);max-width:560px;margin:0 auto 36px;font-size:1rem}
.cta2 .ph{display:flex;gap:36px;justify-content:center;margin-top:40px;flex-wrap:wrap;color:rgba(255,255,255,.85);font-size:.92rem}
.cta2 .ph b{display:block;color:#fff;font-size:1.02rem;margin-top:2px}

/* Footer */
footer{background:#052C1B;color:rgba(255,255,255,.62);font-size:.84rem}
.fwrap{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:44px;padding:80px 0 54px}
footer h5{color:#fff;font-size:.92rem;font-weight:700;margin-bottom:18px}
footer a.fli{display:block;color:rgba(255,255,255,.6);padding:6px 0;transition:color .2s}
footer a.fli:hover{color:var(--gold-soft)}
footer .fdsc{color:rgba(255,255,255,.55);line-height:1.9;margin:16px 0 22px;max-width:320px}
.fbtm{border-top:1px solid rgba(255,255,255,.12);padding:22px 0 26px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:rgba(255,255,255,.45);font-size:.74rem}
@media(max-width:900px){.fwrap{grid-template-columns:1fr 1fr}.fwrap>div:first-child{grid-column:1/-1}}

/* Reveal */
.rv{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.rv.vs{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.rv{opacity:1;transform:none}}