/* ============================================
   DAIBODE 戴泊德 · 品牌官网样式
   配色：深邃海军蓝 + 钢蓝 + 亮蓝点缀（德系精工）
============================================ */

:root{
  --navy-900:#0a1628;
  --navy-800:#0f2138;
  --navy-700:#15294a;
  --steel-600:#2a4a6b;
  --steel-500:#3a5d80;
  --accent:#1c8fd6;       /* 主点缀蓝 */
  --accent-bright:#3da9f5;
  --accent-deep:#0b6fb3;
  --ink:#0d1b2a;
  --slate-700:#3b4a5c;
  --slate-500:#64748b;
  --slate-400:#94a3b8;
  --line:#e6ebf2;
  --line-soft:#eef2f7;
  --bg-soft:#f5f8fb;
  --bg-paper:#fbfcfe;
  --white:#ffffff;

  --font-sans:'Inter','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-cn:'Noto Sans SC','Inter',sans-serif;

  --container:1240px;
  --radius:4px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-cn);
  color:var(--ink);
  background:var(--white);
  line-height:1.7;
  font-weight:400;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
::selection{background:var(--accent);color:#fff}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 32px}

/* ============ 顶部公告条 ============ */
.topbar{
  background:var(--navy-900);
  color:rgba(255,255,255,.62);
  font-size:12.5px;
  letter-spacing:.04em;
}
.topbar__inner{
  display:flex;justify-content:space-between;align-items:center;
  height:38px;font-family:var(--font-sans);font-weight:400;
}
.topbar__contact a{transition:color .2s}
.topbar__contact a:hover{color:var(--accent-bright)}
.topbar__contact .dot{margin:0 8px;opacity:.4}

/* ============ 导航 ============ */
.nav{
  position:fixed;top:38px;left:0;right:0;z-index:100;
  transition:all .4s var(--ease);
  background:rgba(255,255,255,.85);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  top:0;
  background:rgba(255,255,255,.92);
  border-bottom-color:var(--line);
  box-shadow:0 6px 30px -18px rgba(15,33,56,.25);
}
.nav__inner{
  display:flex;align-items:center;justify-content:space-between;
  height:74px;
}

.logo{display:flex;align-items:center;gap:11px;color:var(--navy-900)}
.logo__mark{
  width:30px;height:30px;border-radius:6px;position:relative;
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent-deep) 100%);
  box-shadow:0 4px 14px -4px rgba(28,143,214,.6);
}
.logo__mark::after{
  content:"";position:absolute;inset:6px;border-radius:3px;
  background:linear-gradient(135deg,rgba(255,255,255,.4),transparent 60%);
}
.logo__text{display:flex;flex-direction:column;line-height:1}
.logo__en{
  font-family:var(--font-sans);font-weight:700;font-size:18px;letter-spacing:.22em;
  color:var(--navy-900);
}
.logo__cn{font-size:11px;letter-spacing:.3em;color:var(--slate-500);margin-top:3px;font-weight:500}
.logo--light .logo__en{color:#fff}
.logo--light .logo__cn{color:rgba(255,255,255,.55)}

.nav__links{display:flex;align-items:center;gap:6px}
.nav__link{
  position:relative;font-size:15px;color:var(--slate-700);font-weight:500;
  padding:10px 16px;transition:color .25s;
}
.nav__link::after{
  content:"";position:absolute;left:16px;right:16px;bottom:4px;height:1.5px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .3s var(--ease);
}
.nav__link:hover,.nav__link.active{color:var(--navy-900)}
.nav__link:hover::after,.nav__link.active::after{transform:scaleX(1)}
.nav__link--cta{
  margin-left:12px;padding:10px 22px;border-radius:var(--radius);
  background:var(--navy-900);color:#fff!important;
}
.nav__link--cta::after{display:none}
.nav__link--cta:hover{background:var(--accent-deep)}

.nav__toggle{display:none;flex-direction:column;gap:5px;padding:8px}
.nav__toggle span{width:24px;height:2px;background:var(--navy-900);border-radius:2px;transition:.3s}
.nav__toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav__toggle.open span:nth-child(2){opacity:0}
.nav__toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:15px 30px;font-size:15px;font-weight:500;letter-spacing:.02em;
  border-radius:var(--radius);transition:all .3s var(--ease);
  font-family:var(--font-cn);
}
.btn--primary{background:var(--accent);color:#fff;box-shadow:0 10px 26px -10px rgba(28,143,214,.7)}
.btn--primary:hover{background:var(--accent-deep);transform:translateY(-2px);box-shadow:0 14px 30px -10px rgba(28,143,214,.8)}
.btn--ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.4)}
.btn--ghost:hover{background:rgba(255,255,255,.1);border-color:#fff}
.btn__arrow{transition:transform .3s var(--ease)}
.btn:hover .btn__arrow{transform:translateX(4px)}

/* ============ Hero ============ */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;padding:160px 0 90px}
.hero__bg{
  position:absolute;inset:0;
  background:url('https://images.unsplash.com/photo-1571896349842-33c89424de2d?auto=format&fit=crop&w=2000&q=85') center/cover no-repeat;
  transform:scale(1.05);
  animation:heroZoom 18s ease-in-out infinite alternate;
}
@keyframes heroZoom{to{transform:scale(1.14)}}
.hero__overlay{
  position:absolute;inset:0;
  background:linear-gradient(115deg,rgba(8,20,40,.92) 0%,rgba(10,28,55,.82) 40%,rgba(20,45,80,.5) 100%);
}
.hero__inner{position:relative;z-index:2;color:#fff;max-width:880px}
.hero__eyebrow{
  display:inline-flex;align-items:center;gap:14px;
  font-family:var(--font-sans);font-size:13px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--accent-bright);font-weight:500;margin-bottom:30px;
}
.hero__eyebrow-line{width:38px;height:1.5px;background:var(--accent-bright)}
.hero__title{
  font-size:clamp(40px,6.4vw,80px);font-weight:900;line-height:1.08;letter-spacing:-.01em;
  margin-bottom:30px;
}
.hero__title span{
  background:linear-gradient(90deg,var(--accent-bright),#7dd0ff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.hero__desc{
  font-size:clamp(15px,1.4vw,18px);color:rgba(255,255,255,.78);
  font-weight:300;line-height:1.9;max-width:640px;margin-bottom:44px;
}
.hero__actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:80px}

.hero__stats{display:flex;gap:48px;flex-wrap:wrap;padding-top:42px;border-top:1px solid rgba(255,255,255,.14)}
.hero__stat-num{
  font-family:var(--font-sans);font-size:clamp(32px,3.6vw,46px);font-weight:700;
  color:#fff;line-height:1;letter-spacing:-.02em;
}
.hero__stat-num span{color:var(--accent-bright);font-size:.7em;margin-left:2px}
.hero__stat-label{margin-top:10px;font-size:13px;color:rgba(255,255,255,.6);letter-spacing:.05em}

.hero__scroll{
  position:absolute;bottom:32px;left:50%;transform:translateX(-50%);z-index:3;
  width:22px;height:42px;border:1.5px solid rgba(255,255,255,.4);border-radius:14px;
  display:flex;justify-content:center;padding-top:8px;
}
.hero__scroll-line{width:2px;height:8px;background:var(--accent-bright);border-radius:2px;animation:scrollDot 1.8s var(--ease) infinite}
@keyframes scrollDot{0%{opacity:0;transform:translateY(-4px)}40%{opacity:1}100%{opacity:0;transform:translateY(14px)}}

/* ============ 通用章节头 ============ */
.section-head{max-width:760px;margin:0 auto 70px;text-align:center}
.section-head__eyebrow{
  display:inline-block;font-family:var(--font-sans);font-size:13px;letter-spacing:.22em;
  color:var(--accent-deep);font-weight:600;margin-bottom:22px;
}
.section-head__eyebrow--light{color:var(--accent-bright)}
.section-head__title{
  font-size:clamp(30px,4vw,50px);font-weight:700;line-height:1.2;letter-spacing:-.01em;color:var(--navy-900);
}
.section-head__title--light{color:#fff}
.section-head__desc{margin-top:24px;font-size:16.5px;color:var(--slate-500);line-height:1.9;font-weight:400}
.section-head__desc--light{color:rgba(255,255,255,.7)}

/* ============ 优势一句话 ============ */
.advantage{padding:90px 0;background:var(--bg-soft);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.advantage__text{
  font-size:clamp(20px,2.1vw,28px);line-height:1.85;font-weight:300;color:var(--slate-700);
  text-align:center;max-width:1000px;margin:0 auto;
}
.advantage__text strong{color:var(--navy-900);font-weight:600}
.advantage__text span{color:var(--accent-deep);font-weight:600}
.advantage__brand{font-family:var(--font-sans);font-weight:700;color:var(--navy-900);letter-spacing:.08em}

/* ============ 产品中心 ============ */
.products{padding:120px 0}
.products__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.product{
  background:var(--white);border:1px solid var(--line);border-radius:8px;
  padding:42px 34px 38px;transition:all .4s var(--ease);position:relative;overflow:hidden;
}
.product::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--accent),var(--accent-deep));
  transform:scaleX(0);transform-origin:left;transition:transform .4s var(--ease);
}
.product:hover{transform:translateY(-6px);border-color:transparent;box-shadow:0 26px 50px -22px rgba(15,33,56,.28)}
.product:hover::before{transform:scaleX(1)}
.product__media{
  width:74px;height:74px;border-radius:14px;margin-bottom:28px;
  display:flex;align-items:center;justify-content:center;position:relative;
  background:linear-gradient(135deg,var(--bg-soft),#e8f1f9);color:var(--accent-deep);
  transition:all .4s var(--ease);
}
.product:hover .product__media{background:linear-gradient(135deg,var(--accent),var(--accent-deep));color:#fff;transform:rotate(-4deg)}
.product__icon{width:42px;height:42px}
.product__tag{
  position:absolute;top:24px;right:28px;
  font-family:var(--font-sans);font-size:13px;font-weight:700;letter-spacing:.1em;
  color:var(--line);transition:color .3s;
}
.product:hover .product__tag{color:var(--accent)}
.product__title{font-size:22px;font-weight:700;color:var(--navy-900);margin-bottom:4px}
.product__en{font-family:var(--font-sans);font-size:13px;color:var(--slate-400);letter-spacing:.05em;margin-bottom:18px}
.product__desc{font-size:15px;color:var(--slate-500);line-height:1.85;margin-bottom:24px}
.product__feats{display:flex;flex-wrap:wrap;gap:8px}
.product__feats li{
  font-size:12.5px;color:var(--steel-600);background:var(--bg-soft);
  padding:6px 12px;border-radius:20px;font-weight:500;
}

/* ============ 核心科技 ============ */
.tech{
  position:relative;padding:120px 0;color:#fff;overflow:hidden;
  background:linear-gradient(160deg,var(--navy-900) 0%,var(--navy-800) 50%,var(--navy-700) 100%);
}
.tech::before{
  content:"";position:absolute;top:-200px;right:-200px;width:600px;height:600px;border-radius:50%;
  background:radial-gradient(circle,rgba(28,143,214,.18),transparent 70%);
}
.tech::after{
  content:"";position:absolute;bottom:-150px;left:-150px;width:500px;height:500px;border-radius:50%;
  background:radial-gradient(circle,rgba(61,169,245,.1),transparent 70%);
}
.tech__inner{position:relative;z-index:2}
.tech__head{max-width:760px;margin-bottom:70px}
.tech__head .section-head__title,
.tech__head .section-head__desc{text-align:left}
.tech__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.08);border-radius:8px;overflow:hidden}
.tech__item{background:rgba(255,255,255,.02);padding:42px 32px;transition:background .4s}
.tech__item:hover{background:rgba(28,143,214,.08)}
.tech__num{
  font-family:var(--font-sans);font-size:13px;font-weight:700;color:var(--accent-bright);
  letter-spacing:.1em;margin-bottom:22px;padding-bottom:14px;border-bottom:1px solid rgba(255,255,255,.12);
  display:inline-block;
}
.tech__title{font-size:20px;font-weight:600;color:#fff;margin-bottom:14px}
.tech__desc{font-size:14.5px;color:rgba(255,255,255,.62);line-height:1.85;font-weight:300}

/* ============ 应用场景 ============ */
.apps{padding:120px 0;background:var(--bg-paper)}
.apps__grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.app{
  position:relative;min-height:340px;border-radius:10px;overflow:hidden;
  display:flex;align-items:flex-end;padding:38px;color:#fff;cursor:pointer;
  background-image:var(--img);background-size:cover;background-position:center;
  transition:transform .5s var(--ease);
}
.app__overlay{
  position:absolute;inset:0;
  background:linear-gradient(to top,rgba(8,18,36,.9) 0%,rgba(10,25,50,.5) 50%,rgba(15,33,56,.2) 100%);
  transition:background .4s;
}
.app:hover{transform:scale(1.01)}
.app:hover .app__overlay{background:linear-gradient(to top,rgba(8,18,36,.92) 0%,rgba(28,143,214,.45) 100%)}
.app__content{position:relative;z-index:2}
.app__idx{
  font-family:var(--font-sans);font-size:13px;font-weight:700;letter-spacing:.15em;
  color:var(--accent-bright);display:block;margin-bottom:10px;
}
.app__title{font-size:26px;font-weight:700;margin-bottom:8px}
.app__desc{font-size:15px;color:rgba(255,255,255,.78);font-weight:300}

/* ============ 关于 ============ */
.about{padding:120px 0;background:var(--white)}
.about__inner{display:grid;grid-template-columns:1.1fr 1fr;gap:80px;align-items:center}
.about__body{margin-top:32px}
.about__body p{font-size:15.5px;color:var(--slate-500);line-height:1.95;margin-bottom:20px;font-weight:400}
.about__body p:last-child{margin-bottom:0}
.about__certs{display:flex;flex-wrap:wrap;gap:12px;margin-top:38px}
.about__cert{
  font-family:var(--font-sans);font-size:13px;font-weight:700;color:var(--steel-600);
  padding:10px 18px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--bg-soft);letter-spacing:.06em;transition:all .3s;
}
.about__cert:hover{border-color:var(--accent);color:var(--accent-deep);background:#fff}
.about__visual{position:relative;height:480px}
.about__visual-bg{
  position:absolute;inset:0;border-radius:12px;
  background:linear-gradient(160deg,var(--navy-900),var(--navy-700));
  background-image:linear-gradient(160deg,rgba(10,22,40,.85),rgba(20,45,80,.75)),
    url('https://images.unsplash.com/photo-1540541338287-41700207dee6?auto=format&fit=crop&w=900&q=80');
  background-size:cover;background-position:center;
  box-shadow:0 30px 60px -25px rgba(15,33,56,.5);
}
.about__badge{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:180px;height:180px;border-radius:50%;
  background:rgba(255,255,255,.08);backdrop-filter:blur(8px);
  border:1px solid rgba(255,255,255,.25);
  display:flex;align-items:center;justify-content:center;
  animation:badgeFloat 5s ease-in-out infinite;
}
@keyframes badgeFloat{50%{transform:translate(-50%,calc(-50% - 10px))}}
.about__badge-ring{position:absolute;inset:10px;border-radius:50%;border:1px dashed rgba(255,255,255,.3);animation:spin 22s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.about__badge-core{position:relative;text-align:center;color:#fff;font-family:var(--font-sans)}
.about__badge-top{display:block;font-size:11px;letter-spacing:.3em;color:var(--accent-bright);margin-bottom:6px}
.about__badge-year{display:block;font-size:36px;font-weight:700;letter-spacing:.02em}
.about__badge-bot{display:block;font-size:10px;letter-spacing:.28em;color:rgba(255,255,255,.6);margin-top:6px}
.about__stat{
  position:absolute;bottom:28px;right:28px;
  background:rgba(255,255,255,.95);backdrop-filter:blur(10px);
  padding:22px 28px;border-radius:10px;
  box-shadow:0 18px 40px -16px rgba(8,18,36,.4);
}
.about__stat-num{font-family:var(--font-sans);font-size:40px;font-weight:700;color:var(--navy-900);line-height:1}
.about__stat-num span{color:var(--accent)}
.about__stat-label{font-size:13px;color:var(--slate-500);margin-top:8px;line-height:1.4}

/* ============ 联系 CTA ============ */
.contact{padding:120px 0;background:var(--bg-soft)}
.contact__card{
  background:linear-gradient(130deg,var(--navy-900) 0%,var(--navy-700) 100%);
  border-radius:14px;overflow:hidden;
  display:grid;grid-template-columns:1.2fr 1fr;position:relative;
  box-shadow:0 40px 70px -30px rgba(15,33,56,.5);
}
.contact__card::before{
  content:"";position:absolute;top:-100px;right:-100px;width:300px;height:300px;border-radius:50%;
  background:radial-gradient(circle,rgba(28,143,214,.25),transparent 70%);
}
.contact__left{padding:64px 56px;position:relative;z-index:2}
.contact__title{font-size:clamp(28px,3.2vw,42px);font-weight:700;color:#fff;line-height:1.2;margin:22px 0 18px}
.contact__desc{font-size:16px;color:rgba(255,255,255,.7);line-height:1.85;margin-bottom:34px;max-width:440px}
.contact__right{
  padding:64px 56px;background:rgba(0,0,0,.18);position:relative;z-index:2;
  display:flex;flex-direction:column;justify-content:center;gap:26px;
}
.contact__item{display:flex;flex-direction:column;gap:6px}
.contact__label{font-size:12.5px;color:var(--accent-bright);letter-spacing:.12em;text-transform:uppercase;font-family:var(--font-sans);font-weight:600}
.contact__value{font-size:18px;color:#fff;font-weight:500;transition:color .25s}
a.contact__value:hover{color:var(--accent-bright)}
.contact__value--static{color:rgba(255,255,255,.85);font-weight:400}

/* ============ 页脚 ============ */
.footer{background:var(--navy-900);color:rgba(255,255,255,.6);padding:72px 0 0}
.footer__inner{display:grid;grid-template-columns:1.3fr 2fr;gap:60px;padding-bottom:54px}
.footer__tagline{margin-top:22px;font-size:14px;line-height:1.9;color:rgba(255,255,255,.5);font-weight:300}
.footer__cols{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.footer__col{display:flex;flex-direction:column;gap:13px}
.footer__title{color:#fff;font-size:15px;font-weight:600;margin-bottom:6px;letter-spacing:.02em}
.footer__col a,.footer__static{font-size:14px;color:rgba(255,255,255,.55);transition:color .25s}
.footer__col a:hover{color:var(--accent-bright)}
.footer__bottom{border-top:1px solid rgba(255,255,255,.1)}
.footer__bottom-inner{
  display:flex;justify-content:space-between;align-items:center;height:60px;
  font-size:12.5px;color:rgba(255,255,255,.4);font-family:var(--font-sans);letter-spacing:.03em;
}

/* ============ 滚动渐显动画 ============ */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.visible{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media(max-width:1024px){
  .products__grid{grid-template-columns:repeat(2,1fr)}
  .tech__grid{grid-template-columns:repeat(2,1fr)}
  .about__inner{gap:50px}
}
@media(max-width:820px){
  .container{padding:0 22px}
  .topbar{display:none}
  .nav{top:0}
  .nav__inner{height:64px}
  .nav__links{
    position:fixed;top:64px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:#fff;padding:14px 22px 28px;
    box-shadow:0 20px 40px -20px rgba(15,33,56,.3);
    transform:translateY(-130%);transition:transform .4s var(--ease);pointer-events:none;
  }
  .nav__links.open{transform:none;pointer-events:auto}
  .nav__link{padding:14px 4px;border-bottom:1px solid var(--line-soft);font-size:16px}
  .nav__link::after{display:none}
  .nav__link--cta{margin:14px 0 0;text-align:center}
  .nav__toggle{display:flex}

  .hero{padding:130px 0 70px;min-height:auto}
  .hero__stats{gap:30px 40px}
  .hero__stat{flex:1 1 40%}

  .section-head{margin-bottom:50px}
  .products,.tech,.apps,.about,.contact{padding:80px 0}
  .advantage{padding:60px 0}

  .products__grid,.tech__grid,.apps__grid{grid-template-columns:1fr}
  .tech__head .section-head__title,.tech__head .section-head__desc{text-align:center}
  .tech__head{max-width:760px;margin-left:auto;margin-right:auto}

  .about__inner{grid-template-columns:1fr;gap:50px}
  .about__visual{height:380px}

  .contact__card{grid-template-columns:1fr}
  .contact__left,.contact__right{padding:44px 32px}
  .contact__right{border-top:1px solid rgba(255,255,255,.1)}

  .footer__inner{grid-template-columns:1fr;gap:40px}
  .footer__bottom-inner{flex-direction:column;gap:6px;height:auto;padding:18px 0;text-align:center}
}
@media(max-width:480px){
  .hero__stats{flex-direction:column;gap:24px}
  .hero__stat{flex:none}
  .btn{padding:13px 24px;font-size:14px}
}