/* ============ 基础 ============ */
:root{
  --brand:#10b981;
  --brand-2:#06b6d4;
  --brand-3:#8b5cf6;
  --ink:#0f172a;
  --ink-2:#334155;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg:#ffffff;
  --bg-alt:#f6f9fb;
  --radius:18px;
  --shadow:0 18px 50px -20px rgba(15,23,42,.25);
  --grad:linear-gradient(120deg,var(--brand-2),var(--brand) 45%,var(--brand-3));
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(1180px,92vw);margin:0 auto}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ============ 进度条 / 返回顶部 ============ */
.page-progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--grad);z-index:999;transition:width .1s}
.to-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border:none;border-radius:50%;background:var(--grad);color:#fff;font-size:20px;cursor:pointer;box-shadow:var(--shadow);opacity:0;transform:translateY(16px);pointer-events:none;transition:.35s;z-index:90}
.to-top.show{opacity:1;transform:none;pointer-events:auto}

/* ============ 导航 ============ */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:.3s}
.nav__inner{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800}
.brand__logo{height:38px;width:auto}
.brand__name{font-size:19px;letter-spacing:.5px;display:flex;flex-direction:column;line-height:1;color:#fff;transition:.3s}
.brand__name i{font-style:normal;font-size:10px;letter-spacing:3px;color:rgba(255,255,255,.7);font-weight:600}
.menu{display:flex;gap:30px}
.menu__item{color:rgba(255,255,255,.9);font-weight:600;position:relative;padding:6px 0;transition:.25s}
.menu__item::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--grad);transition:.3s}
.menu__item:hover{color:#fff}
.menu__item:hover::after{width:100%}
.nav.scrolled{background:rgba(255,255,255,.92);backdrop-filter:blur(12px);box-shadow:0 6px 24px -16px rgba(15,23,42,.4)}
.nav.scrolled .brand__name{color:var(--ink)}
.nav.scrolled .brand__name i{color:var(--muted)}
.nav.scrolled .menu__item{color:var(--ink-2)}
.nav.scrolled .menu__item:hover{color:var(--brand)}
.menu-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer}
.menu-toggle span{width:24px;height:2px;background:#fff;transition:.3s;border-radius:2px}
.nav.scrolled .menu-toggle span{background:var(--ink)}

/* ============ Hero ============ */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;color:#fff;
  background:radial-gradient(1200px 600px at 80% -10%,rgba(139,92,246,.35),transparent),
             linear-gradient(160deg,#0b1120,#0f2540 55%,#0b3b3a)}
.hero__bg{position:absolute;inset:0;overflow:hidden}
.hero__grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:46px 46px;mask-image:radial-gradient(circle at 50% 40%,#000,transparent 75%)}
.blob{position:absolute;border-radius:50%;filter:blur(36px);opacity:.55;animation:float 14s ease-in-out infinite}
.blob--1{width:360px;height:360px;background:var(--brand-2);top:8%;left:-60px}
.blob--2{width:420px;height:420px;background:var(--brand);bottom:-80px;right:6%;animation-delay:-4s}
.blob--3{width:300px;height:300px;background:var(--brand-3);top:40%;right:30%;animation-delay:-8s}
@keyframes float{0%,100%{transform:translateY(0) translateX(0)}50%{transform:translateY(-34px) translateX(20px)}}
.hero__content{position:relative;z-index:2;padding-top:90px}
.hero__eyebrow{display:inline-block;padding:7px 16px;border:1px solid rgba(255,255,255,.25);border-radius:999px;font-size:13px;letter-spacing:1px;margin-bottom:22px;backdrop-filter:blur(4px)}
.hero__title{font-size:clamp(34px,6vw,68px);line-height:1.12;font-weight:800;letter-spacing:1px}
.hero__sub{margin:22px 0 34px;max-width:620px;color:rgba(255,255,255,.82);font-size:clamp(15px,1.6vw,18px)}
.hero__actions{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 28px;border-radius:999px;font-weight:700;cursor:pointer;border:0;transition:.3s;font-size:15px}
.btn--primary{background:var(--grad);color:#fff;box-shadow:0 14px 30px -12px rgba(16,185,129,.7)}
.btn--primary:hover{transform:translateY(-3px);box-shadow:0 20px 40px -14px rgba(16,185,129,.8)}
.btn--ghost{background:rgba(255,255,255,.08);color:#fff;border:1px solid rgba(255,255,255,.35)}
.btn--ghost:hover{background:rgba(255,255,255,.18);transform:translateY(-3px)}
.hero__stats{display:flex;gap:38px;flex-wrap:wrap;margin-top:56px}
.stat b{font-size:clamp(26px,3.4vw,40px);font-weight:800;display:block;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-size:13px;color:rgba(255,255,255,.7)}
.hero__scroll{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);width:26px;height:42px;border:2px solid rgba(255,255,255,.5);border-radius:14px;z-index:2}
.hero__scroll span{position:absolute;left:50%;top:8px;width:4px;height:8px;background:#fff;border-radius:2px;transform:translateX(-50%);animation:scrolldot 1.6s infinite}
@keyframes scrolldot{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}100%{opacity:0;transform:translate(-50%,16px)}}

/* ============ 通用区块 ============ */
.section{padding:96px 0}
.section--alt{background:var(--bg-alt)}
.section--dark{background:linear-gradient(160deg,#0b1120,#0f2540);color:#fff}
.section__head{text-align:center;max-width:760px;margin:0 auto 54px}
.section__kicker{letter-spacing:4px;font-size:13px;font-weight:700;color:var(--brand);margin-bottom:12px}
.section--dark .section__kicker{color:var(--brand-2)}
.section__title{font-size:clamp(26px,4vw,42px);font-weight:800;margin-bottom:16px}
.section__lead{color:var(--muted);font-size:16px}
.section--dark .section__lead{color:rgba(255,255,255,.7)}

/* ============ 关于 ============ */
.about-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.about-card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;transition:.35s;position:relative;overflow:hidden}
.about-card:hover{transform:translateY(-8px);box-shadow:var(--shadow);border-color:transparent}
.about-card--hl{background:var(--grad);color:#fff;border-color:transparent}
.about-card--hl .about-card__no{color:rgba(255,255,255,.55)}
.about-card__no{font-size:30px;font-weight:800;color:var(--brand);opacity:.25;margin-bottom:8px}
.about-card h3{font-size:19px;margin-bottom:10px}
.about-card p{font-size:14px;color:var(--muted)}
.about-card--hl p{color:rgba(255,255,255,.9)}

/* ============ 产品 ============ */
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.prod-card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;transition:.35s;position:relative}
.prod-card:hover{transform:translateY(-8px);box-shadow:var(--shadow);border-color:transparent}
.prod-card__icon{width:58px;height:58px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(6,182,212,.15),rgba(16,185,129,.15));color:var(--brand);margin-bottom:18px}
.prod-card__icon svg{width:30px;height:30px}
.prod-card h3{font-size:19px;margin-bottom:10px}
.prod-card p{font-size:14px;color:var(--muted)}

/* ============ 专利与资质 ============ */
.patent-filter{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:40px}
.chip{border:1px solid var(--line);background:#fff;color:var(--ink-2);padding:9px 18px;border-radius:999px;cursor:pointer;font-weight:600;font-size:14px;transition:.25s}
.chip:hover{border-color:var(--brand)}
.chip.is-active{background:var(--grad);color:#fff;border-color:transparent}
.patent-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.patent-card{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:.4s;animation:fadeUp .5s both}
.patent-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.patent-card.hide{display:none}
.patent-card__img{aspect-ratio:1/1.32;background:#f1f5f9;overflow:hidden;display:grid;place-items:center;position:relative}
.patent-card__img::after{content:"点击查看 PDF";position:absolute;left:50%;bottom:12px;transform:translateX(-50%);background:rgba(15,23,42,.78);color:#fff;font-size:12px;padding:6px 14px;border-radius:999px;opacity:0;transition:.3s;pointer-events:none}
.patent-card:hover .patent-card__img::after{opacity:1}
.patent-card__img img{width:100%;height:100%;object-fit:cover;transition:.5s}
.patent-card:hover .patent-card__img img{transform:scale(1.06)}
.patent-card figcaption{padding:16px 18px;display:flex;flex-direction:column;gap:6px}
.patent-card figcaption b{font-size:15px;font-weight:700}
.patent-card figcaption i{font-style:normal;font-size:12px;color:var(--muted)}
.tag{font-size:11px;font-weight:700;padding:3px 10px;border-radius:999px;align-self:flex-start}
.tag--inv{background:rgba(139,92,246,.14);color:#7c3aed}
.tag--ht{background:rgba(16,185,129,.16);color:#059669}
.tag--sw{background:rgba(6,182,212,.16);color:#0891b2}
.patent-note{text-align:center;color:var(--muted);font-size:13px;margin-top:34px}

/* ============ 联系 ============ */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;max-width:640px;margin:0 auto}
.contact-card{display:flex;flex-direction:column;align-items:center;text-align:center;gap:12px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);padding:32px 22px;border-radius:var(--radius);transition:.35s;text-decoration:none;color:#fff}
.contact-card:hover{transform:translateY(-6px);border-color:transparent;box-shadow:var(--shadow);background:rgba(255,255,255,.07)}
.contact-card__ic{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;font-size:26px;background:linear-gradient(135deg,rgba(6,182,212,.2),rgba(16,185,129,.2))}
.contact-card__label{font-size:13px;color:rgba(255,255,255,.65);font-weight:600;letter-spacing:2px}
.contact-card__val{font-size:16px;font-weight:600;color:#fff;line-height:1.5}
a.contact-card:hover .contact-card__val{color:var(--brand-2)}

/* ============ 页脚 ============ */
.footer{background:#0a0f1c;color:#fff;padding:40px 0}
.footer__inner{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap}
.footer__brand{display:flex;align-items:center;gap:12px}
.footer__brand img{height:34px}
.footer__brand p{color:rgba(255,255,255,.7);font-size:14px}
.footer__copy{color:rgba(255,255,255,.6);font-size:13px}
.footer__copy a{color:var(--brand-2);text-decoration:underline}

/* ============ 证书弹窗（PDF / 图片） ============ */
.lightbox{position:fixed;inset:0;background:rgba(8,12,22,.94);display:flex;flex-direction:column;z-index:200;opacity:0;pointer-events:none;transition:.3s}
.lightbox.open{opacity:1;pointer-events:auto}
.lightbox__bar{display:flex;align-items:center;gap:16px;padding:14px 20px;background:rgba(255,255,255,.06);border-bottom:1px solid rgba(255,255,255,.12)}
.lightbox__name{flex:1;color:#fff;font-weight:600;font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lightbox__dl{color:#0b1120;background:#fff;padding:8px 16px;border-radius:999px;font-size:13px;font-weight:700;text-decoration:none;transition:.25s;white-space:nowrap}
.lightbox__dl:hover{background:var(--brand-2);color:#fff}
.lightbox__close{width:42px;height:42px;flex:none;border:none;border-radius:50%;background:rgba(255,255,255,.15);color:#fff;font-size:24px;cursor:pointer;transition:.25s}
.lightbox__close:hover{background:rgba(255,255,255,.3)}
.lightbox__body{flex:1;min-height:0;display:flex;align-items:center;justify-content:center;padding:18px}
.lightbox__body iframe{width:100%;height:100%;border:0;background:#fff;border-radius:8px}
.lightbox img{max-width:92vw;max-height:84vh;border-radius:10px;box-shadow:0 30px 80px -20px rgba(0,0,0,.7)}

/* ============ 滚动揭示动画 ============ */
.reveal{opacity:0;transform:translateY(34px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in-view{opacity:1;transform:none}
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .blob{animation:none}
}

/* ============ 响应式 ============ */
@media (max-width:1000px){
  .about-grid,.prod-grid{grid-template-columns:repeat(2,1fr)}
  .patent-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .menu{position:fixed;top:74px;right:0;flex-direction:column;background:#fff;width:min(78vw,300px);padding:18px 22px;gap:6px;box-shadow:var(--shadow);transform:translateX(110%);transition:.35s;border-radius:0 0 0 16px}
  .menu.open{transform:none}
  .menu__item{color:var(--ink-2);padding:12px 4px;border-bottom:1px solid var(--line)}
  .menu-toggle{display:flex}
  .hero__stats{gap:24px}
  .contact-grid{grid-template-columns:1fr}
  .about-grid,.prod-grid,.patent-grid{grid-template-columns:1fr}
  .section{padding:70px 0}
}