:root{
  --green-deep:#1a5c3a;
  --green:#2e7d4f;
  --green-mid:#4c9a6a;
  --green-soft:#eaf4ec;
  --ink:#2b3a30;
  --text:#3f4d45;
  --muted:#7a8a80;
  --gold:#b98a2f;
  --bg:#fbfaf6;
  --card:#ffffff;
  --line:#e3e9e4;
  --serif:"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --sans:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --kai:"KaiTi","STKaiti","Kaiti SC",serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--text);background:var(--bg);line-height:1.75;font-size:16px}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
.container{max-width:1180px;margin:0 auto;padding:0 24px}

/* ===== top bar ===== */
.topbar{background:var(--green-deep);color:#cfe6d6;font-size:13px;padding:6px 0}
.topbar .container{display:flex;justify-content:space-between;gap:12px}
@media(max-width:640px){.topbar .container span:last-child{display:none}}

/* ===== nav ===== */
header.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);transition:box-shadow .3s}
header.nav.scrolled{box-shadow:0 4px 18px rgba(26,92,58,.10)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px}
.brand .mark{width:46px;height:42px;object-fit:contain;mix-blend-mode:multiply}
.brand-text b{display:block;font-family:var(--serif);font-size:20px;color:var(--green-deep);letter-spacing:2px;line-height:1.25}
.brand-text small{font-size:11px;color:var(--muted);letter-spacing:1px}
nav.menu{display:flex;gap:4px}
nav.menu a{padding:8px 13px;font-size:15px;color:var(--ink);border-radius:6px;transition:.25s;position:relative}
nav.menu a:hover{color:#fff;background:var(--green)}
nav.menu a.active{color:#fff;background:var(--green-deep)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:6px;padding:8px 10px;font-size:18px;color:var(--green-deep);cursor:pointer}
@media(max-width:980px){
  header.nav{position:relative}
  nav.menu{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:10px 18px 16px;border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(0,0,0,.08);gap:2px}
  nav.menu.open{display:flex}
  .nav-toggle{display:block}
  .brand-text b{font-size:16px;letter-spacing:1px}
  .brand-text small{display:none}
}

/* ===== hero (home) ===== */
.hero{position:relative;min-height:620px;display:flex;align-items:center;color:#fff;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:url("../images/case-ziyuntai.jpg") center/cover no-repeat;transform:scale(1.02);animation:heroZoom 18s ease-in-out infinite alternate}
@keyframes heroZoom{from{transform:scale(1.02)}to{transform:scale(1.1)}}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(10,40,24,.8) 0%,rgba(13,55,32,.55) 45%,rgba(13,55,32,.16) 100%)}
.hero-inner{position:relative;z-index:2;max-width:1180px;margin:0 auto;padding:90px 24px;width:100%}
.hero-tag{display:inline-flex;align-items:center;gap:10px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.35);padding:6px 16px;border-radius:99px;font-size:13px;letter-spacing:2px;backdrop-filter:blur(4px)}
.hero h1{font-family:var(--serif);font-size:52px;letter-spacing:4px;margin:26px 0 14px;text-shadow:0 2px 14px rgba(0,0,0,.35)}
.hero .slogan{font-family:var(--kai);font-size:24px;letter-spacing:6px;color:#f3ecd8;text-shadow:0 1px 8px rgba(0,0,0,.4)}
.hero .sub{margin-top:16px;max-width:640px;color:rgba(255,255,255,.88);font-size:15.5px}
.hero-cta{margin-top:36px;display:flex;gap:16px;flex-wrap:wrap}
@media(max-width:640px){.hero{min-height:520px}.hero h1{font-size:32px;letter-spacing:2px}.hero .slogan{font-size:17px;letter-spacing:3px}.hero .sub{font-size:14.5px}}

.btn{display:inline-block;padding:13px 34px;border-radius:8px;font-size:15.5px;letter-spacing:2px;transition:.28s;cursor:pointer}
.btn-primary{background:var(--gold);color:#fff;box-shadow:0 8px 22px rgba(185,138,47,.4)}
.btn-primary:hover{background:#a37a24;transform:translateY(-2px)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.75);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.16);transform:translateY(-2px)}
.btn-outline{border:1.5px solid var(--green);color:var(--green-deep);background:#fff}
.btn-outline:hover{background:var(--green);color:#fff;transform:translateY(-2px)}

/* ===== page banner (sub pages) ===== */
.page-banner{position:relative;padding:76px 0 66px;color:#fff;overflow:hidden}
.page-banner::before{content:"";position:absolute;inset:0;background:url("../images/case-aobei.jpg") center 45%/cover no-repeat;transform:scale(1.02)}
.page-banner::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(13,47,29,.86),rgba(13,47,29,.55))}
.page-banner .inner{position:relative;z-index:2}
.page-banner .en{font-size:12.5px;letter-spacing:4px;color:#a9cdb6;text-transform:uppercase}
.page-banner h1{font-family:var(--serif);font-size:40px;letter-spacing:5px;margin:10px 0 12px}
.page-banner p{max-width:720px;color:rgba(255,255,255,.82);font-size:15px;font-family:var(--kai)}
.crumb{margin-top:22px;font-size:13px;color:#a9cdb6}
.crumb a:hover{color:#fff}
.crumb span{margin:0 8px;opacity:.6}
@media(max-width:640px){.page-banner{padding:52px 0 44px}.page-banner h1{font-size:28px;letter-spacing:2px}}

/* ===== stats ===== */
.stats{background:var(--green-deep);color:#fff;padding:44px 0}
.stats .container{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;text-align:center}
.stat b{display:block;font-size:38px;font-family:var(--serif);color:#f0e6c8;line-height:1.15}
.stat b em{font-style:normal;font-size:17px;margin-left:3px;color:#cfe0c2}
.stat span{font-size:13.5px;color:#b9d4c1;letter-spacing:1px}
@media(max-width:820px){.stats .container{grid-template-columns:repeat(2,1fr);row-gap:30px}.stat:last-child{grid-column:span 2}}

/* ===== sections ===== */
section.block{padding:84px 0}
section.block.alt{background:#fff}
section.block.tight{padding:64px 0}
.sec-head{text-align:center;max-width:760px;margin:0 auto 50px}
.sec-head .kicker{display:inline-block;color:var(--gold);font-size:13px;letter-spacing:4px;text-transform:uppercase}
.sec-head h2{font-family:var(--serif);font-size:34px;color:var(--green-deep);letter-spacing:3px;margin:10px 0 14px}
.sec-head h2::after{content:"";display:block;width:56px;height:3px;background:linear-gradient(90deg,var(--green),var(--gold));margin:16px auto 0;border-radius:2px}
.sec-head p{color:var(--muted);font-size:15px}
.sec-head.left{text-align:left;margin-left:0;margin-bottom:34px}
.sec-head.left h2::after{margin-left:0}
.more-wrap{text-align:center;margin-top:48px}

/* about */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
.about-text h3{font-family:var(--serif);font-size:24px;color:var(--green-deep);margin-bottom:18px;letter-spacing:1px}
.about-text p{margin-bottom:14px;text-align:justify}
.about-text .hl{color:var(--green);font-weight:600}
.about-photo{position:relative}
.about-photo img{border-radius:12px;box-shadow:0 18px 44px rgba(26,92,58,.18)}
.about-photo::before{content:"";position:absolute;inset:-16px 16px 16px -16px;border:2px solid var(--green-soft);border-radius:14px;z-index:-1}
@media(max-width:860px){.about-grid{grid-template-columns:1fr}}

/* founder */
.founder{background:linear-gradient(180deg,var(--green-soft),#fff);border-radius:18px;padding:52px;display:grid;grid-template-columns:240px 1fr;gap:44px;align-items:center;box-shadow:0 12px 34px rgba(26,92,58,.08)}
.founder img{width:220px;height:220px;object-fit:cover;border-radius:50%;border:5px solid #fff;box-shadow:0 10px 26px rgba(26,92,58,.22);margin:0 auto}
.founder blockquote{font-family:var(--kai);font-size:17px;color:var(--ink)}
.founder blockquote p{margin-bottom:12px;text-indent:2em}
.founder .name{margin-top:18px;font-family:var(--serif);color:var(--green-deep);font-size:18px;letter-spacing:2px}
.founder .name small{color:var(--muted);font-family:var(--sans);font-size:13px;margin-left:10px;letter-spacing:0}
@media(max-width:760px){.founder{grid-template-columns:1fr;padding:36px 24px}}

/* services */
.svc-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.svc{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:30px 18px;text-align:center;transition:.3s;position:relative;overflow:hidden}
.svc::before{content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:var(--green);transform:scaleX(0);transition:.3s;transform-origin:left}
.svc:hover{transform:translateY(-6px);box-shadow:0 16px 34px rgba(26,92,58,.13);border-color:transparent}
.svc:hover::before{transform:scaleX(1)}
.svc .icon{width:58px;height:58px;margin:0 auto 16px;border-radius:50%;background:var(--green-soft);display:flex;align-items:center;justify-content:center}
.svc .icon svg{width:30px;height:30px;stroke:var(--green-deep);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.svc h4{font-size:16.5px;color:var(--ink);margin-bottom:6px;letter-spacing:.5px}
.svc p{font-size:12.8px;color:var(--muted);line-height:1.6}
@media(max-width:1080px){.svc-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:680px){.svc-grid{grid-template-columns:repeat(2,1fr)}}

/* services detail rows */
.svc-rows{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.svc-row{background:#fff;border:1px solid var(--line);border-radius:14px;padding:30px 30px 32px;transition:.3s;position:relative;overflow:hidden}
.svc-row::after{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(180deg,var(--green),var(--gold));opacity:0;transition:.3s}
.svc-row:hover{box-shadow:0 16px 36px rgba(26,92,58,.12);transform:translateY(-4px)}
.svc-row:hover::after{opacity:1}
.svc-row .head{display:flex;align-items:center;gap:14px;margin-bottom:12px}
.svc-row .no{font-family:var(--serif);font-size:15px;color:#fff;background:var(--green);width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex:none}
.svc-row h4{font-family:var(--serif);font-size:19px;color:var(--green-deep);letter-spacing:1px}
.svc-row p{font-size:14px;color:var(--text);text-align:justify}
.svc-row ul{margin-top:10px;padding-left:0;list-style:none;font-size:13.2px;color:var(--muted)}
.svc-row ul li{padding-left:16px;position:relative;line-height:1.85}
.svc-row ul li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;border-radius:50%;background:var(--green-mid)}
@media(max-width:800px){.svc-rows{grid-template-columns:1fr}}

/* process steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:s}
.step{background:#fff;border:1px dashed var(--line);border-radius:12px;padding:28px 22px;position:relative}
.step::before{counter-increment:s;content:"0" counter(s);font-family:var(--serif);font-size:34px;color:var(--green-soft);position:absolute;right:16px;top:10px;font-weight:700}
.step h4{font-size:16.5px;color:var(--green-deep);margin-bottom:8px;position:relative}
.step p{font-size:13.2px;color:var(--muted)}
@media(max-width:900px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.steps{grid-template-columns:1fr}}

/* cases */
.filter{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:40px}
.filter button{padding:9px 22px;border-radius:99px;border:1px solid var(--line);background:#fff;color:var(--text);font-size:14px;cursor:pointer;transition:.25s;letter-spacing:1px}
.filter button:hover{border-color:var(--green);color:var(--green)}
.filter button.active{background:var(--green-deep);border-color:var(--green-deep);color:#fff}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.case{background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 8px 26px rgba(26,92,58,.09);transition:.35s;display:flex;flex-direction:column;border:1px solid var(--line)}
.case:hover{transform:translateY(-8px);box-shadow:0 20px 44px rgba(26,92,58,.17)}
.case.hide{display:none}
.case .cover{height:206px;overflow:hidden}
.case .cover img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.case:hover .cover img{transform:scale(1.07)}
.case .body{padding:22px 22px 24px;flex:1;display:flex;flex-direction:column}
.case .cat{display:inline-block;align-self:flex-start;font-size:11.5px;color:var(--green-deep);background:var(--green-soft);padding:3px 12px;border-radius:99px;letter-spacing:1px;margin-bottom:12px}
.case h4{font-family:var(--serif);font-size:17px;color:var(--ink);margin-bottom:8px;line-height:1.5}
.case .meta{font-size:12.5px;color:var(--muted);margin-bottom:10px}
.case .desc{font-size:13.5px;color:var(--text);line-height:1.7;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
@media(max-width:980px){.case-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.case-grid{grid-template-columns:1fr}}

/* honors */
.honor-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.honor{background:#fff;border:1px solid var(--line);border-left:4px solid var(--gold);border-radius:10px;padding:24px 20px;transition:.3s}
.honor:hover{box-shadow:0 12px 28px rgba(185,138,47,.14);transform:translateY(-4px)}
.honor b{display:block;color:var(--ink);font-size:15.5px;margin-bottom:6px;line-height:1.5}
.honor span{font-size:12.5px;color:var(--muted)}
@media(max-width:900px){.honor-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.honor-grid{grid-template-columns:1fr}}

/* award list */
.award-list{display:grid;gap:16px}
.award{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px 28px;display:grid;grid-template-columns:96px 1fr;gap:24px;align-items:center;transition:.3s}
.award:hover{border-color:var(--green-mid);box-shadow:0 10px 26px rgba(26,92,58,.10)}
.award .year{font-family:var(--serif);font-size:26px;color:var(--green);text-align:center;border-right:1px solid var(--line);padding-right:20px}
.award h4{font-size:16.5px;color:var(--ink);margin-bottom:4px}
.award p{font-size:13.5px;color:var(--muted)}
@media(max-width:640px){.award{grid-template-columns:1fr;gap:10px}.award .year{border-right:0;border-bottom:1px solid var(--line);padding:0 0 8px;text-align:left;font-size:20px}}

/* culture */
.culture{background:linear-gradient(160deg,#123c26,#1a5c3a 60%,#227147);color:#fff;position:relative;overflow:hidden}
.culture::after{content:"山";position:absolute;right:-40px;bottom:-90px;font-family:var(--serif);font-size:420px;color:rgba(255,255,255,.045);line-height:1}
.culture .sec-head h2{color:#fff}
.culture .sec-head h2::after{background:linear-gradient(90deg,#8fd0a5,var(--gold))}
.culture .sec-head p{color:#b9d4c1}
.culture .container{position:relative;z-index:2}
.culture-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;position:relative;z-index:2}
.cul{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:12px;padding:28px 22px;transition:.3s}
.cul:hover{background:rgba(255,255,255,.13);transform:translateY(-4px)}
.cul h4{font-family:var(--serif);font-size:17px;color:#f0e6c8;letter-spacing:2px;margin-bottom:10px}
.cul p{font-size:13.5px;color:#d7e8db;font-family:var(--kai)}
@media(max-width:900px){.culture-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.culture-grid{grid-template-columns:1fr}}

/* vision text */
.vision{background:#fff;border-radius:16px;padding:44px;border:1px solid var(--line);box-shadow:0 10px 30px rgba(26,92,58,.07)}
.vision p{font-size:15.5px;text-align:justify;margin-bottom:14px}
.vision .hl{color:var(--green);font-weight:600}
@media(max-width:640px){.vision{padding:26px}}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:stretch}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:38px}
.contact-card h3{font-family:var(--serif);color:var(--green-deep);font-size:21px;margin-bottom:22px;letter-spacing:2px}
.c-row{display:flex;gap:14px;align-items:flex-start;margin-bottom:20px}
.c-row .dot{flex:none;width:40px;height:40px;border-radius:50%;background:var(--green-soft);display:flex;align-items:center;justify-content:center}
.c-row .dot svg{width:20px;height:20px;stroke:var(--green-deep);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.c-row b{display:block;font-size:14.5px;color:var(--ink)}
.c-row span{font-size:14.5px;color:var(--text)}
.qr-card{background:linear-gradient(150deg,var(--green-deep),#227147);border-radius:14px;padding:38px;color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
.qr-card img{width:180px;height:186px;object-fit:cover;border-radius:10px;background:#fff;padding:8px;margin-bottom:16px}
.qr-card b{font-size:17px;letter-spacing:2px;margin-bottom:4px}
.qr-card span{font-size:13px;color:#cfe6d6}
@media(max-width:860px){.contact-grid{grid-template-columns:1fr}}

/* cta band */
.cta-band{background:linear-gradient(120deg,#1a5c3a,#227147);color:#fff;padding:64px 0}
.cta-band .container{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.cta-band h3{font-family:var(--serif);font-size:28px;letter-spacing:2px;margin-bottom:8px}
.cta-band p{color:#cfe6d6;font-size:14.5px}

/* footer */
footer{background:#0f2e1d;color:#8fae9b;padding:44px 0 28px;font-size:13.5px}
footer .container{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:flex-start}
footer .f-brand{font-family:var(--serif);color:#e8f2ea;font-size:19px;letter-spacing:2px;margin-bottom:8px}
footer a:hover{color:#fff}
.f-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:30px;padding-top:20px;text-align:center;color:#6d8a79;font-size:12.5px}

/* back to top */
.to-top{position:fixed;right:22px;bottom:26px;width:44px;height:44px;border-radius:50%;background:var(--green-deep);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 22px rgba(26,92,58,.3);opacity:0;pointer-events:none;transition:.3s;z-index:90;border:0;cursor:pointer;font-size:18px}
.to-top.show{opacity:1;pointer-events:auto}
@media(max-width:640px){.to-top{right:14px;bottom:16px}}

/* reveal animation */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}.hero::before{animation:none}}