:root{
  --green:#0e9f6e; --green-d:#0b7c56; --blue:#0ea5e9;
  --ink:#12241c; --mut:#5b6b63; --bg:#ffffff; --alt:#f3faf7;
  --line:#e3ede8; --radius:14px;
  font-size:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
img{max-width:100%;display:block}
a{color:var(--green-d);text-decoration:none}
.container{max-width:1120px;margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--green),var(--blue));color:#fff;font-weight:800;font-size:20px;display:grid;place-items:center}
.brand-text{font-weight:800;letter-spacing:1px;display:flex;flex-direction:column;line-height:1.1;font-size:17px}
.brand-sub{font-size:9px;letter-spacing:3px;color:var(--mut);font-weight:600}
.nav{display:flex;gap:22px}
.nav a{color:var(--ink);font-weight:600;font-size:.95rem;padding:6px 2px;border-bottom:2px solid transparent}
.nav a:hover{border-color:var(--green)}
.header-actions{display:flex;align-items:center;gap:10px}
.lang-btn{border:1px solid var(--line);background:#fff;border-radius:8px;padding:6px 12px;font-weight:700;cursor:pointer}
.lang-btn:hover{border-color:var(--green)}
.nav-toggle{display:none;background:none;border:none;font-size:22px;cursor:pointer}

/* buttons */
.btn{display:inline-block;padding:12px 26px;border-radius:10px;font-weight:700;font-size:.95rem;transition:.2s;border:2px solid transparent;cursor:pointer}
.btn-primary{background:var(--green);color:#fff}
.btn-primary:hover{background:var(--green-d);transform:translateY(-1px)}
.btn-ghost{border-color:var(--green);color:var(--green-d)}
.btn-ghost:hover{background:var(--green);color:#fff}
.btn-sm{padding:8px 16px;font-size:.85rem}

/* hero */
.hero{background:linear-gradient(180deg,var(--alt),#fff 90%);overflow:hidden}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;padding:64px 20px}
.hero-tag{color:var(--green-d);font-weight:800;font-size:.8rem;letter-spacing:2px}
.hero h1{font-size:2.6rem;line-height:1.2;margin:12px 0 16px}
.hero-sub{color:var(--mut);font-size:1.05rem;max-width:560px}
.hero-cta{display:flex;gap:14px;margin:26px 0 30px}
.hero-stats{display:flex;gap:34px;flex-wrap:wrap}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-size:1.5rem;color:var(--green-d)}
.hero-stats span{font-size:.8rem;color:var(--mut)}
.hero-art svg{width:100%;max-width:420px;height:auto}

/* sections */
.section{padding:70px 0}
.section-alt{background:var(--alt)}
.section-head{text-align:center;margin-bottom:40px}
.section-head h2{font-size:2rem;margin-bottom:8px}
.section-head p{color:var(--mut)}

/* category tabs */
.cat-tabs{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-bottom:32px}
.cat-tab{border:1px solid var(--line);background:#fff;border-radius:999px;padding:9px 20px;font-weight:600;cursor:pointer;font-size:.9rem}
.cat-tab.active{background:var(--green);color:#fff;border-color:var(--green)}

/* product grid */
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}
.product-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:.2s;display:flex;flex-direction:column}
.product-card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(14,159,110,.12)}
.product-thumb{aspect-ratio:4/3;background:linear-gradient(135deg,#e8f7f1,#e0f2fe);display:grid;place-items:center;overflow:hidden}
.product-thumb img{width:100%;height:100%;object-fit:contain;padding:10px}
.product-thumb svg{width:56px;height:56px;opacity:.55}
.product-info{padding:14px 16px 18px}
.product-cat{font-size:.72rem;color:var(--green-d);font-weight:700;letter-spacing:.5px;text-transform:uppercase}
.product-name{font-size:.98rem;font-weight:700;margin:4px 0 6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.product-desc{font-size:.82rem;color:var(--mut);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* solutions */
.sol-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:20px}
.sol-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.sol-card h3{font-size:1.05rem;margin:10px 0 8px}
.sol-card p{font-size:.88rem;color:var(--mut)}
.sol-icon{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--green),var(--blue));display:grid;place-items:center;color:#fff;font-size:22px}

/* about */
.about-inner{display:grid;grid-template-columns:1.3fr .7fr;gap:44px;align-items:start}
.about-inner h2{font-size:2rem;margin-bottom:14px}
.about-inner p{color:var(--mut);margin-bottom:12px}
.about-list{list-style:none;margin-top:10px}
.about-list li{padding:4px 0;font-weight:600;font-size:.95rem}
.about-card{background:var(--alt);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.about-card h3{margin-bottom:14px}
.why-item{display:flex;flex-direction:column;padding:10px 0;border-bottom:1px dashed var(--line)}
.why-item:last-child{border-bottom:none}
.why-item b{color:var(--green-d)}
.why-item span{font-size:.85rem;color:var(--mut)}

/* contact form */
.quote-form{max-width:640px;margin:0 auto;display:grid;gap:18px}
.form-row{position:relative}
.form-row input,.form-row textarea{width:100%;padding:16px 14px 8px;border:1px solid var(--line);border-radius:10px;font:inherit;background:#fff;outline:none;resize:vertical}
.form-row input:focus,.form-row textarea:focus{border-color:var(--green);box-shadow:0 0 0 3px rgba(14,159,110,.12)}
.form-row label{position:absolute;left:14px;top:12px;color:var(--mut);pointer-events:none;transition:.15s;font-size:.95rem}
.form-row input:focus+label,.form-row input:not(:placeholder-shown)+label,
.form-row textarea:focus+label,.form-row textarea:not(:placeholder-shown)+label{top:4px;font-size:.72rem;color:var(--green-d);font-weight:700}
.form-actions{display:flex;gap:12px;flex-wrap:wrap}
.form-note{font-size:.78rem;color:var(--mut)}

/* footer */
.site-footer{background:#0d1f18;color:#cfe3da;padding:44px 0 0;margin-top:20px}
.footer-inner{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:30px;padding-bottom:28px}
.site-footer b{color:#fff}
.site-footer a{color:#7fd8b5}
.footer-copy{border-top:1px solid rgba(255,255,255,.1);padding:16px 20px;font-size:.78rem;color:#8aa89c;text-align:center}

/* modal */
.modal{position:fixed;inset:0;background:rgba(10,25,18,.55);display:grid;place-items:center;z-index:100;padding:20px}
.modal-box{background:#fff;border-radius:16px;max-width:820px;width:100%;display:grid;grid-template-columns:1fr 1fr;overflow:hidden;position:relative;max-height:88vh}
.modal-img{background:linear-gradient(135deg,#e8f7f1,#e0f2fe);display:grid;place-items:center;min-height:320px}
.modal-img img{max-height:340px;object-fit:contain;padding:24px}
.modal-img svg{width:80px;opacity:.5}
.modal-body{padding:32px;overflow:auto}
.modal-cat{font-size:.75rem;color:var(--green-d);font-weight:700;text-transform:uppercase;letter-spacing:1px}
.modal-body h3{font-size:1.4rem;margin:8px 0 12px}
.modal-body p{color:var(--mut);font-size:.92rem;white-space:pre-line}
.modal-actions{margin-top:22px;display:flex;gap:12px;flex-wrap:wrap}
.modal-close{position:absolute;top:10px;right:12px;background:#fff;border:1px solid var(--line);width:34px;height:34px;border-radius:50%;cursor:pointer;font-size:14px;z-index:2}

/* responsive */
@media (max-width:860px){
  .hero-inner{grid-template-columns:1fr;padding:44px 20px}
  .hero h1{font-size:2rem}
  .about-inner{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr 1fr}
  .nav{position:fixed;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:18px 24px;gap:14px;border-bottom:1px solid var(--line);display:none}
  .nav.open{display:flex}
  .nav-toggle{display:block}
  .modal-box{grid-template-columns:1fr;overflow:auto}
}

/* 品牌logo（透明底PNG，453x131） */
.brand-logo{height:42px;width:auto;display:block}
@media (max-width:760px){.brand-logo{height:34px}}
.modal[hidden]{display:none!important}

/* 新闻动态 */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.news-card{background:#fff;border-radius:14px;padding:18px;box-shadow:0 2px 10px rgba(16,40,30,.05);cursor:pointer;transition:transform .15s}
.news-card:hover{transform:translateY(-2px)}
.news-card .news-date{font-size:.76rem;color:#10b981;font-weight:700}
.news-card h3{font-size:.95rem;color:#0f2a22;margin:8px 0 6px}
.news-card p{font-size:.84rem;color:#5a6b64;margin:0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
@media (max-width:760px){.news-grid{grid-template-columns:1fr}}