/* ════════════════════════════════════════
   一道云科技 - 官网样式表
   参考风格: luyufly.com / moresec.cn / appendata.com / miyourobot.com
   ════════════════════════════════════════ */

/* ─── Variables ─── */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #60a5fa;
  --primary-bg: #eff6ff;
  --accent: #f59e0b;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --gray-800: #334155;
  --gray-600: #64748b;
  --gray-400: #94a3b8;
  --gray-200: #e2e8f0;
  --gray-100: #f1f5f9;
  --gray-50: #f8fafc;
  --white: #ffffff;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 24px rgba(0,0,0,.08);
  --shadow-lg: 0 20px 60px rgba(0,0,0,.12);
  --transition: .35s cubic-bezier(.4,0,.2,1);
}

/* ─── Reset ─── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;-webkit-font-smoothing:antialiased}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  color:var(--dark);background:var(--white);line-height:1.6;overflow-x:hidden
}
a{text-decoration:none;color:inherit}
ul{list-style:none}
::selection{background:var(--primary);color:#fff}

/* ─── Layout ─── */
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section-header{text-align:center;margin-bottom:56px}
.tag{
  display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:2.5px;
  color:var(--primary);text-transform:uppercase;margin-bottom:12px
}
.section-header h2{font-size:2.2rem;font-weight:800;margin-bottom:12px;letter-spacing:-.5px}
.section-header p{font-size:1.05rem;color:var(--gray-600);max-width:560px;margin:0 auto}

/* ─── Buttons ─── */
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:14px 32px;
  border-radius:50px;font-size:.92rem;font-weight:600;border:none;
  cursor:pointer;transition:var(--transition);font-family:inherit
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 8px 30px rgba(37,99,235,.3)}
.btn-ghost{background:transparent;color:rgba(255,255,255,.8);border:1.5px solid rgba(255,255,255,.2)}
.btn-ghost:hover{border-color:rgba(255,255,255,.6);color:#fff;transform:translateY(-2px)}
.btn-full{width:100%;justify-content:center;padding:16px;font-size:1rem}

/* ─── Nav ─── */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  padding:18px 0;transition:var(--transition)
}
.nav.scrolled{background:rgba(255,255,255,.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);box-shadow:0 1px 0 var(--gray-200);padding:12px 0}
.nav-inner{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;padding:0 24px}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:800;color:#fff;transition:var(--transition)}
.nav.scrolled .nav-logo{color:var(--dark)}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-links a{font-size:.88rem;font-weight:500;color:rgba(255,255,255,.8);transition:var(--transition);position:relative}
.nav-links a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--primary);transition:var(--transition)}
.nav-links a:hover{color:#fff}
.nav-links a:hover::after{width:100%}
.nav.scrolled .nav-links a{color:var(--gray-800)}
.nav.scrolled .nav-links a:hover{color:var(--primary)}
.nav-cta{
  padding:10px 24px!important;background:var(--primary);color:#fff!important;
  border-radius:50px!important;font-weight:600!important
}
.nav-cta::after{display:none!important}
.nav-cta:hover{background:var(--primary-dark)!important}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:none;padding:4px}
.nav-toggle span{display:block;width:26px;height:2px;background:#fff;border-radius:2px;transition:var(--transition)}
.nav.scrolled .nav-toggle span{background:var(--dark)}
.nav-toggle.active span:nth-child(1){transform:rotate(45deg)translate(5px,5px)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:rotate(-45deg)translate(5px,-5px)}

/* ─── Hero ─── */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  background:linear-gradient(135deg,#0b1120 0%,#0f1f3a 40%,#1a365d 70%,#1e3a8a 100%);overflow:hidden
}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-grid{
  position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:40px 40px
}
.hero-glow{
  position:absolute;top:-30%;right:-10%;width:600px;height:600px;
  background:radial-gradient(circle,rgba(37,99,235,.15) 0%,transparent 60%);
  pointer-events:none
}
.hero-content{position:relative;z-index:1;width:100%;max-width:1200px;margin:0 auto;padding:120px 24px 80px}
.hero-badge{
  display:inline-block;padding:8px 20px;border-radius:50px;font-size:.82rem;font-weight:500;
  background:rgba(255,255,255,.08);color:var(--primary-light);border:1px solid rgba(255,255,255,.1);
  margin-bottom:24px;backdrop-filter:blur(10px)
}
.hero h1{
  font-size:clamp(2.5rem,6vw,4.2rem);font-weight:900;color:#fff;
  line-height:1.08;letter-spacing:-1.5px;margin-bottom:16px
}
.hero-sub{font-size:1.1rem;color:rgba(255,255,255,.5);margin-bottom:40px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:64px}
.hero-metrics{display:flex;gap:56px;flex-wrap:wrap}
.metric{text-align:center}
.metric-num{font-size:2.8rem;font-weight:900;color:#fff;letter-spacing:-1px}
.metric-suffix{font-size:1.5rem;font-weight:700;color:var(--accent);margin-left:2px}
.metric-label{display:block;font-size:.82rem;color:rgba(255,255,255,.45);margin-top:2px}

/* ─── About ─── */
.about{padding:120px 0;background:var(--white)}
.about-header{text-align:center;margin-bottom:56px}
.about-header .tag{color:var(--primary)}
.about-header h2{font-size:2.2rem;font-weight:800}
.about-header p{color:var(--gray-600);margin-top:8px}
.about-body{display:grid;grid-template-columns:1.2fr 1fr;gap:60px;align-items:start}
.about-text p{color:var(--gray-600);font-size:1.02rem;margin-bottom:16px;line-height:1.8}
.about-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.about-tags span{
  padding:8px 18px;background:var(--primary-bg);color:var(--primary);
  border-radius:50px;font-size:.82rem;font-weight:500
}
.about-timeline{position:relative;padding-left:28px}
.tl-line{position:absolute;left:8px;top:0;bottom:0;width:2px;background:var(--gray-200)}
.tl-item{position:relative;padding:10px 0 10px 24px;display:flex;gap:16px;align-items:baseline}
.tl-item::before{
  content:'';position:absolute;left:-24px;top:16px;width:10px;height:10px;
  border-radius:50%;background:var(--gray-200);border:2px solid var(--white);z-index:1
}
.tl-item.active::before{background:var(--primary);box-shadow:0 0 0 4px var(--primary-bg)}
.tl-yr{font-weight:700;color:var(--primary);min-width:44px;white-space:nowrap}
.tl-item span:last-child{color:var(--gray-600);font-size:.92rem}
.tl-item.active span:last-child{color:var(--dark);font-weight:500}

/* ─── Products ─── */
.products{padding:120px 0;background:var(--gray-50)}
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.prod-card{
  background:var(--white);border-radius:var(--radius);padding:32px 28px;
  border:1px solid var(--gray-200);transition:var(--transition);
  position:relative;overflow:hidden
}
.prod-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--gray-200);transition:var(--transition)
}
.prod-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:transparent}
.prod-card:hover::before{background:var(--primary)}
.prod-card.highlight{
  border-color:var(--primary-light);background:linear-gradient(180deg,#eff6ff 0%,#fff 40%)
}
.prod-card.highlight::before{background:var(--primary)}
.prod-badge{
  position:absolute;top:16px;right:16px;padding:4px 14px;font-size:.72rem;font-weight:700;
  background:var(--accent);color:#fff;border-radius:50px
}
.prod-icon{width:44px;height:44px;margin-bottom:18px;color:var(--primary)}
.prod-icon svg{width:44px;height:44px}
.prod-icon-1{color:#2563eb}
.prod-icon-2{color:#7c3aed}
.prod-icon-3{color:#0891b2}
.prod-icon-4{color:#ec4899}
.prod-icon-5{color:#059669}
.prod-card h3{font-size:1.08rem;font-weight:700;margin-bottom:8px}
.prod-tagline{font-size:.85rem;color:var(--gray-600);margin-bottom:16px;line-height:1.5}
.prod-feats{display:flex;flex-direction:column;gap:10px;margin-bottom:20px}
.prod-feats li{
  font-size:.85rem;color:var(--gray-800);padding-left:20px;
  position:relative;line-height:1.5
}
.prod-feats li::before{
  content:'';position:absolute;left:0;top:7px;width:6px;height:6px;
  border-radius:50%;background:var(--primary-light)
}
.prod-card.highlight .prod-feats li::before{background:#ec4899}
.prod-data{display:flex;gap:20px;padding-top:16px;border-top:1px solid var(--gray-100);font-size:.82rem;color:var(--gray-600)}
.prod-data strong{color:var(--primary);font-weight:700}

/* ─── Solutions ─── */
.solutions{padding:120px 0;background:var(--white)}
.sol-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.sol-card{
  padding:32px 28px;border-radius:var(--radius);border:1px solid var(--gray-200);
  transition:var(--transition);cursor:default
}
.sol-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow-md);transform:translateY(-4px)}
.sol-num{font-size:2rem;font-weight:900;color:var(--gray-200);margin-bottom:8px;transition:var(--transition)}
.sol-card:hover .sol-num{color:var(--primary-light)}
.sol-card h3{font-size:1.05rem;font-weight:700;margin-bottom:8px}
.sol-card p{font-size:.85rem;color:var(--gray-600);line-height:1.6}

/* ─── Cases ─── */
.cases{padding:120px 0;background:var(--gray-50)}
.case-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:48px}
.case-card{
  text-align:center;padding:40px 20px;background:var(--white);
  border-radius:var(--radius);border:1px solid var(--gray-200);transition:var(--transition)
}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.case-stat{margin-bottom:8px}
.case-num{font-size:3rem;font-weight:900;color:var(--primary);letter-spacing:-1px}
.case-unit{font-size:1.2rem;font-weight:700;color:var(--gray-600);margin-left:4px}
.case-desc{font-size:.88rem;color:var(--gray-600)}
.case-logos{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.case-logos span{
  padding:10px 28px;background:var(--white);border:1px solid var(--gray-200);
  border-radius:var(--radius-sm);font-size:.88rem;font-weight:600;color:var(--gray-800);
  transition:var(--transition)
}
.case-logos span:hover{border-color:var(--primary-light);color:var(--primary);box-shadow:var(--shadow)}

/* ─── Qualifications ─── */
.quals{padding:100px 0;background:var(--dark);overflow:hidden}
.quals .section-header h2{color:#fff}
.qual-scroll{overflow:hidden;mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent);-webkit-mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent)}
.qual-track{display:flex;gap:12px;animation:scroll 30s linear infinite;width:max-content}
@keyframes scroll{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}
.qual-item{
  white-space:nowrap;padding:14px 28px;border-radius:50px;
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);
  color:var(--gray-400);font-size:.88rem;font-weight:500;transition:var(--transition);
  flex-shrink:0
}
.qual-item:hover{background:rgba(255,255,255,.1);color:#fff;border-color:var(--primary-light)}

/* ─── Contact ─── */
.contact{padding:120px 0;background:var(--gray-50)}
.contact-inner{display:grid;grid-template-columns:1fr 1.2fr;gap:60px;align-items:center}
.contact-info .tag{color:var(--primary)}
.contact-info h2{font-size:2.2rem;font-weight:800;margin-bottom:8px}
.contact-info>p{font-size:1.05rem;color:var(--gray-600);margin-bottom:32px}
.ci-detail{display:flex;flex-direction:column;gap:16px}
.ci-detail div{display:flex;gap:12px;align-items:center}
.ci-detail strong{font-size:.88rem;font-weight:600;color:var(--gray-800);min-width:80px}
.ci-detail span{font-size:.88rem;color:var(--gray-600)}
.contact-form{background:var(--white);padding:36px;border-radius:var(--radius);box-shadow:var(--shadow-md)}
.cf-row{display:flex;gap:12px;margin-bottom:12px}
.cf-row input,.cf-row select,.cf-row textarea{
  width:100%;padding:14px 16px;border:1.5px solid var(--gray-200);border-radius:var(--radius-sm);
  font-size:.88rem;font-family:inherit;transition:var(--transition);background:var(--white);color:var(--dark)
}
.cf-row input:focus,.cf-row select:focus,.cf-row textarea:focus{outline:none;border-color:var(--primary-light);box-shadow:0 0 0 4px rgba(37,99,235,.08)}
.cf-row input::placeholder,.cf-row textarea::placeholder{color:var(--gray-400)}

/* ─── Footer ─── */
.footer{background:var(--dark);color:var(--gray-400);padding:60px 0 0}
.footer-top{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:48px;padding-bottom:40px;border-bottom:1px solid var(--gray-800)}
.footer-brand{display:flex;flex-direction:column;gap:8px}
.footer-brand svg{width:28px;height:28px}
.footer-brand span{font-size:1.15rem;font-weight:800;color:#fff}
.footer-brand p{font-size:.82rem;margin-top:4px}
.footer-links{display:flex;flex-direction:column;gap:12px}
.footer-links a,.footer-links span{font-size:.85rem;color:var(--gray-400);transition:var(--transition)}
.footer-links a:hover{color:var(--primary-light)}
.footer-bottom{text-align:center;padding:24px 0;font-size:.8rem}

/* ─── Responsive ─── */
@media(max-width:1024px){
  .prod-grid{grid-template-columns:repeat(2,1fr)}
  .sol-grid{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .about-body{grid-template-columns:1fr}
}
@media(max-width:768px){
  .nav-links{position:fixed;top:0;right:-100%;width:280px;height:100vh;background:var(--white);flex-direction:column;padding:80px 30px 30px;gap:20px;box-shadow:-10px 0 40px rgba(0,0,0,.1);transition:var(--transition)}
  .nav-links.active{right:0}
  .nav-links a{color:var(--dark-2)!important;font-size:1rem!important}
  .nav-toggle{display:flex}
  .prod-grid{grid-template-columns:1fr}
  .sol-grid{grid-template-columns:1fr}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .contact-inner{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr;gap:32px}
  .cf-row{flex-direction:column}
  .hero-metrics{gap:24px}
  .metric-num{font-size:2rem}
  .section-header h2{font-size:1.7rem}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%;justify-content:center}
}

@media(max-width:480px){
  .case-grid{grid-template-columns:1fr}
  .hero h1{font-size:2rem}
}