/* ============================================================
   极致锐信 - 现代企业网站
   Jetacme (Beijing) Science & Technology Co., Ltd.
   ============================================================ */

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#1a1a2e;background:#fff;line-height:1.7;font-size:16px}

/* --- Variables --- */
:root{
  --primary:#1a56db;
  --primary-dark:#1e40af;
  --accent:#0ea5e9;
  --dark:#0f172a;
  --gray-50:#f8fafc;
  --gray-100:#f1f5f9;
  --gray-200:#e2e8f0;
  --gray-300:#cbd5e1;
  --gray-400:#94a3b8;
  --gray-500:#64748b;
  --gray-600:#475569;
  --gray-700:#334155;
  --gray-800:#1e293b;
  --gray-900:#0f172a;
  --radius:8px;
  --shadow:0 1px 3px rgba(0,0,0,.08),0 4px 16px rgba(0,0,0,.04);
  --shadow-lg:0 4px 24px rgba(0,0,0,.12);
  --transition:all .25s ease;
}

/* --- Typography --- */
h1,h2,h3,h4{line-height:1.3;font-weight:700}
h1{font-size:2.75rem;letter-spacing:-.02em}
h2{font-size:2rem;letter-spacing:-.01em}
h3{font-size:1.375rem}
p{margin-bottom:1rem}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--primary-dark)}

.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* --- Navbar --- */
.navbar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(255,255,255,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--gray-200);transition:var(--transition)
}
.navbar.scrolled{box-shadow:var(--shadow)}
.navbar .container{display:flex;align-items:center;justify-content:space-between;height:68px}
.nav-logo{font-size:1.35rem;font-weight:800;color:var(--dark);letter-spacing:-.01em;display:flex;align-items:center;gap:8px}
.nav-logo .logo-dot{width:8px;height:8px;background:var(--primary);border-radius:50%;display:inline-block}
.nav-links{display:flex;list-style:none;gap:32px;align-items:center}
.nav-links a{color:var(--gray-700);font-size:.925rem;font-weight:500;position:relative;padding:4px 0}
.nav-links a::after{
  content:'';position:absolute;bottom:-2px;left:0;width:0;height:2px;
  background:var(--primary);transition:width .25s ease
}
.nav-links a:hover{color:var(--primary)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-links a.active{color:var(--primary)}
.nav-cta{
  background:var(--primary);color:#fff!important;padding:8px 20px!important;
  border-radius:var(--radius);font-weight:600!important;font-size:.875rem!important
}
.nav-cta:hover{background:var(--primary-dark)}.nav-cta::after{display:none!important}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:none;padding:4px}
.nav-toggle span{width:24px;height:2px;background:var(--gray-700);border-radius:2px;transition:var(--transition)}
@media(max-width:768px){
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;
    background:#fff;border-bottom:1px solid var(--gray-200);padding:16px 24px;gap:12px;box-shadow:var(--shadow-lg)}
  .nav-links.open{display:flex}
  .nav-toggle{display:flex}
  h1{font-size:2rem}h2{font-size:1.6rem}
}

/* --- Hero Section --- */
.hero{
  padding:140px 0 80px;background:linear-gradient(135deg,#f0f4ff 0%,#e8f0fe 50%,#dbeafe 100%);
  position:relative;overflow:hidden
}
.hero::before{
  content:'';position:absolute;top:-50%;right:-20%;width:600px;height:600px;
  background:radial-gradient(circle,rgba(26,86,219,.08) 0%,transparent 70%);border-radius:50%
}
.hero .container{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;position:relative;z-index:1}
.hero-badge{
  display:inline-block;background:rgba(26,86,219,.1);color:var(--primary);
  padding:4px 14px;border-radius:20px;font-size:.8rem;font-weight:600;margin-bottom:20px
}
.hero h1{font-size:3rem;margin-bottom:20px;color:var(--dark)}
.hero h1 span{color:var(--primary)}
.hero p{font-size:1.125rem;color:var(--gray-600);margin-bottom:32px;max-width:480px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:12px 28px;
  border-radius:var(--radius);font-weight:600;font-size:.95rem;
  cursor:pointer;border:none;transition:var(--transition);white-space:nowrap
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);color:#fff;transform:translateY(-1px);box-shadow:0 4px 16px rgba(26,86,219,.3)}
.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.hero-image{
  position:relative;display:flex;align-items:center;justify-content:center;
}
.hero-image .card-stack{
  width:320px;height:200px;background:#fff;border-radius:16px;
  box-shadow:var(--shadow-lg);display:flex;align-items:center;justify-content:center;
  position:relative
}
.hero-image .card-stack::before{
  content:'';position:absolute;top:-16px;left:16px;right:-16px;bottom:16px;
  background:rgba(255,255,255,.6);border-radius:16px;z-index:-1
}
.hero-image .card-stack::after{
  content:'';position:absolute;top:-32px;left:32px;right:-32px;bottom:32px;
  background:rgba(255,255,255,.3);border-radius:16px;z-index:-2
}
.hero-stats{display:flex;gap:32px;text-align:center}
.hero-stats .stat-num{font-size:1.5rem;font-weight:800;color:var(--primary)}
.hero-stats .stat-label{font-size:.8rem;color:var(--gray-500)}
@media(max-width:768px){
  .hero{padding:100px 0 50px}.hero .container{grid-template-columns:1fr;gap:40px}
  .hero h1{font-size:2rem}.hero-image{order:-1}
  .hero-image .card-stack{width:240px;height:150px}
}

/* --- Section Common --- */
.section{padding:80px 0}
.section-label{
  display:inline-block;color:var(--primary);font-size:.8rem;font-weight:700;
  text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px
}
.section-title{margin-bottom:16px;color:var(--dark)}
.section-desc{color:var(--gray-600);font-size:1.05rem;max-width:640px;margin-bottom:48px}

/* --- Features Grid --- */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{
  background:#fff;border:1px solid var(--gray-200);border-radius:12px;padding:32px;
  transition:var(--transition)
}
.feature-card:hover{border-color:var(--primary);box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.feature-icon{
  width:48px;height:48px;background:rgba(26,86,219,.1);border-radius:10px;
  display:flex;align-items:center;justify-content:center;margin-bottom:20px;font-size:1.25rem
}
.feature-card h3{margin-bottom:8px;font-size:1.1rem}.feature-card p{color:var(--gray-600);font-size:.925rem;margin:0}
@media(max-width:768px){.features-grid{grid-template-columns:1fr}}

/* --- Solutions --- */
.solutions-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.solution-card{
  background:#fff;border:1px solid var(--gray-200);border-radius:12px;overflow:hidden;
  transition:var(--transition)
}
.solution-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.solution-body{padding:28px}
.solution-body h3{margin-bottom:8px}.solution-body p{color:var(--gray-600);font-size:.925rem;margin:0}
.solution-tag{font-size:.75rem;color:var(--primary);font-weight:600;margin-bottom:8px}
@media(max-width:768px){.solutions-grid{grid-template-columns:1fr}}

/* --- Cases --- */
.cases-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.case-card{
  background:#fff;border:1px solid var(--gray-200);border-radius:12px;padding:28px;
  transition:var(--transition)
}
.case-card:hover{box-shadow:var(--shadow-lg)}
.case-client{font-size:.8rem;color:var(--gray-500);margin-bottom:8px}
.case-card h3{font-size:1rem;margin-bottom:8px}.case-card p{color:var(--gray-600);font-size:.875rem;margin:0}
@media(max-width:768px){.cases-grid{grid-template-columns:1fr}}

/* --- About Page --- */
.about-hero{padding:140px 0 80px;background:var(--gray-900);color:#fff;position:relative;overflow:hidden}
.about-hero::before{
  content:'';position:absolute;top:0;left:0;right:0;bottom:0;
  background:radial-gradient(ellipse at 30% 50%,rgba(26,86,219,.2) 0%,transparent 70%);
}
.about-hero .container{position:relative;z-index:1}
.about-hero h1{font-size:2.5rem;margin-bottom:12px}
.about-hero .subtitle{color:var(--gray-400);font-size:1.1rem}
.timeline{position:relative;padding:40px 0}
.timeline::before{
  content:'';position:absolute;left:50%;top:0;bottom:0;width:2px;background:var(--gray-200);transform:translateX(-50%)
}
.timeline-item{display:flex;align-items:flex-start;margin-bottom:40px;position:relative}
.timeline-item:nth-child(odd){flex-direction:row-reverse}
.timeline-dot{
  position:absolute;left:50%;top:4px;width:12px;height:12px;background:var(--primary);
  border-radius:50%;transform:translateX(-50%);z-index:1;border:3px solid #fff;
  box-shadow:0 0 0 3px var(--primary)
}
.timeline-content{width:45%;background:#fff;border:1px solid var(--gray-200);border-radius:12px;padding:24px}
.timeline-year{font-size:.8rem;color:var(--primary);font-weight:700;margin-bottom:4px}
.timeline-content h4{font-size:1rem;margin-bottom:4px}
.timeline-content p{color:var(--gray-600);font-size:.875rem;margin:0}
@media(max-width:768px){
  .timeline::before{left:20px}
  .timeline-item,.timeline-item:nth-child(odd){flex-direction:column;padding-left:52px}
  .timeline-dot{left:20px}
  .timeline-content{width:100%}
}

/* --- Cert Badges --- */
.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:40px}
.cert-item{
  text-align:center;padding:24px;border:1px solid var(--gray-200);border-radius:12px;
  transition:var(--transition)
}
.cert-item:hover{border-color:var(--primary)}
.cert-item .cert-icon{font-size:2rem;margin-bottom:8px}
.cert-item h4{font-size:.9rem;margin-bottom:4px}.cert-item p{font-size:.8rem;color:var(--gray-500);margin:0}
@media(max-width:768px){.cert-grid{grid-template-columns:repeat(2,1fr)}}

/* --- Contact --- */
.contact-grid{display:grid;grid-template-columns:3fr 2fr;gap:48px}
.contact-form{display:flex;flex-direction:column;gap:16px}
.form-group{display:flex;flex-direction:column;gap:6px}
.form-group label{font-size:.875rem;font-weight:600;color:var(--gray-700)}
.form-group input,.form-group textarea,.form-group select{
  padding:12px 16px;border:1px solid var(--gray-300);border-radius:var(--radius);
  font-size:.95rem;font-family:inherit;transition:var(--transition);outline:none;
  background:#fff
}
.form-group input:focus,.form-group textarea:focus,.form-group select:focus{
  border-color:var(--primary);box-shadow:0 0 0 3px rgba(26,86,219,.1)
}
.form-group textarea{resize:vertical;min-height:120px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:768px){.form-row{grid-template-columns:1fr}}
.contact-info{display:flex;flex-direction:column;gap:24px}
.contact-info-item{display:flex;gap:12px;align-items:flex-start}
.contact-info-icon{
  width:44px;height:44px;background:rgba(26,86,219,.1);border-radius:10px;
  display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0
}
.contact-info-item h4{font-size:.9rem;margin-bottom:2px}
.contact-info-item p{font-size:.875rem;color:var(--gray-600);margin:0}
.contact-map{
  margin-top:24px;border-radius:12px;overflow:hidden;border:1px solid var(--gray-200);
  height:200px;background:var(--gray-100);display:flex;align-items:center;justify-content:center;
  color:var(--gray-500);font-size:.875rem
}

/* --- Footer --- */
.footer{background:var(--gray-900);color:var(--gray-400);padding:60px 0 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand h3{color:#fff;font-size:1.2rem;margin-bottom:12px}
.footer-brand p{font-size:.875rem;margin:0}
.footer-col h4{color:#fff;font-size:.9rem;margin-bottom:16px}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:8px}
.footer-col a{color:var(--gray-400);font-size:.85rem}.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid var(--gray-800);padding-top:24px;text-align:center;font-size:.8rem;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
.footer-bottom a{color:var(--gray-400)}.footer-bottom a:hover{color:#fff}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr}}

/* --- Service Detail --- */
.service-detail-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px;margin-top:40px}
.service-detail-card{
  background:var(--gray-50);border-radius:12px;padding:32px;border:1px solid var(--gray-200)
}
.service-detail-card h3{font-size:1.05rem;margin-bottom:12px}
.service-detail-card ul{list-style:none;display:flex;flex-direction:column;gap:8px}
.service-detail-card li{font-size:.9rem;color:var(--gray-600);padding-left:20px;position:relative}
.service-detail-card li::before{content:'';position:absolute;left:0;top:10px;width:6px;height:6px;background:var(--primary);border-radius:50%}
@media(max-width:768px){.service-detail-grid{grid-template-columns:1fr}}

/* --- Page Header (inner pages) --- */
.page-header{
  padding:120px 0 48px;background:linear-gradient(135deg,var(--gray-900) 0%,#1e293b 100%);
  color:#fff;text-align:center
}
.page-header h1{font-size:2.25rem;margin-bottom:8px}
.page-header p{color:var(--gray-400);font-size:1.05rem;margin:0}

/* --- breadcrumb --- */
.breadcrumb{padding:16px 0;font-size:.85rem;color:var(--gray-500)}
.breadcrumb a{color:var(--gray-500)}.breadcrumb a:hover{color:var(--primary)}
.breadcrumb span{color:var(--gray-700)}

/* --- Stats Bar --- */
.stats-bar{background:var(--primary);padding:48px 0}
.stats-bar .container{display:grid;grid-template-columns:repeat(4,1fr);gap:32px}
.stat-item{text-align:center;color:#fff}
.stat-num{font-size:2.5rem;font-weight:800;letter-spacing:-.02em;margin-bottom:4px}
.stat-label{font-size:.9rem;opacity:.85}
@media(max-width:768px){.stats-bar .container{grid-template-columns:repeat(2,1fr);gap:24px}.stat-num{font-size:1.75rem}}

/* --- CTA Section --- */
.cta-section{
  background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);
  padding:80px 0;text-align:center;color:#fff
}
.cta-section h2{margin-bottom:12px}
.cta-section p{opacity:.9;margin-bottom:28px;font-size:1.05rem}
.cta-section .btn-primary{background:#fff;color:var(--primary)}
.cta-section .btn-primary:hover{background:var(--gray-100)}

/* --- Utility --- */
.text-center{text-align:center}
.bg-gray{background:var(--gray-50)}
.bg-dark{background:var(--gray-900)}