/* ========================================
   上海艾节克科技有限公司 - 主样式表
   ======================================== */

/* CSS Variables */
:root {
  --primary: #1a56db;
  --primary-dark: #1e40af;
  --primary-light: #3b82f6;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --bg-dark: #0f172a;
  --bg-card: #ffffff;
  --text-dark: #1e293b;
  --text-body: #475569;
  --text-muted: #94a3b8;
  --text-light: #cbd5e1;
  --text-white: #f1f5f9;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -2px rgba(0,0,0,.1);
  --shadow-lg: 0 10px 25px -3px rgba(0,0,0,.1),0 4px 10px -4px rgba(0,0,0,.1);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: .3s cubic-bezier(.4,0,.2,1);
  --font-sans: 'PingFang SC','Microsoft YaHei','Helvetica Neue',sans-serif;
  --max-width: 1200px;
}

/* Reset */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font-sans);font-size:16px;line-height:1.6;color:var(--text-body);background:var(--bg-white);overflow-x:hidden}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
img{max-width:100%;height:auto;display:block}
button{cursor:pointer;border:none;font-family:inherit}
input,textarea,select{font-family:inherit;font-size:inherit}

/* Container */
.container{max-width:var(--max-width);margin:0 auto;padding:0 24px}
@media(max-width:768px){.container{padding:0 16px}}

/* ========================================
   LOADING
   ======================================== */
.app-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;gap:16px;color:var(--primary)}
.loading-spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ========================================
   TRANSITIONS
   ======================================== */
.fade-enter-active,.fade-leave-active{transition:opacity .3s ease}
.fade-enter-from,.fade-leave-to{opacity:0}
.slide-up-enter-active,.slide-up-leave-active{transition:all .4s ease}
.slide-up-enter-from{opacity:0;transform:translateY(30px)}
.slide-up-leave-to{opacity:0;transform:translateY(-30px)}

/* ========================================
   HEADER / NAV
   ======================================== */
.header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(15,23,42,.95);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);transition:background var(--transition)}
.header.scrolled{background:rgba(15,23,42,.98);box-shadow:0 2px 20px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;max-width:var(--max-width);margin:0 auto;padding:0 24px}
.header-logo{display:flex;align-items:center;gap:10px}
.header-logo img{height:40px}
.header-logo span{font-size:18px;font-weight:700;color:#fff;white-space:nowrap}
.header-nav{display:flex;align-items:center;gap:4px}
.header-nav a{padding:8px 16px;border-radius:8px;font-size:15px;color:var(--text-light);transition:all var(--transition);position:relative}
.header-nav a:hover,.header-nav a.active{color:#fff;background:rgba(255,255,255,.08)}
.header-nav a.active::after{content:'';position:absolute;bottom:2px;left:50%;transform:translateX(-50%);width:20px;height:3px;background:var(--primary-light);border-radius:2px}
/* Mobile menu button */
.header-menu-btn{display:none;flex-direction:column;gap:5px;background:none;padding:8px;z-index:1001}
.header-menu-btn span{display:block;width:24px;height:2px;background:#fff;border-radius:1px;transition:all var(--transition)}
.header-menu-btn.open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.header-menu-btn.open span:nth-child(2){opacity:0}
.header-menu-btn.open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
/* Mobile nav */
.header-mobile-nav{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(15,23,42,.98);z-index:999;flex-direction:column;align-items:center;justify-content:center;gap:16px}
.header-mobile-nav.open{display:flex}
.header-mobile-nav a{font-size:20px;color:var(--text-light);padding:12px 24px;border-radius:8px;transition:all var(--transition)}
.header-mobile-nav a:hover,.header-mobile-nav a.active{color:#fff;background:rgba(255,255,255,.08)}

@media(max-width:768px){
  .header-nav{display:none}
  .header-menu-btn{display:flex}
}

/* ========================================
   HERO BANNER
   ======================================== */
.hero{position:relative;width:100%;height:100vh;min-height:600px;overflow:hidden;background:#0f172a}
.hero .swiper,.hero .swiper-wrapper,.hero .swiper-slide{height:100%}
.hero-slide{position:relative;display:flex;align-items:center;justify-content:center;height:100%}
.hero-slide img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}
.hero-slide .overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(15,23,42,.85) 0%,rgba(15,23,42,.4) 50%,rgba(15,23,42,.2) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;max-width:800px;padding:0 24px}
.hero-content h1{font-size:clamp(32px,5vw,56px);font-weight:800;color:#fff;line-height:1.2;margin-bottom:16px;letter-spacing:-1px}
.hero-content p{font-size:clamp(16px,2.5vw,20px);color:var(--text-light);margin-bottom:32px;line-height:1.6}
.hero-content .hero-cta{display:inline-flex;gap:12px;flex-wrap:wrap;justify-content:center}
.hero-content .btn{padding:14px 32px;border-radius:50px;font-size:16px;font-weight:600;transition:all var(--transition)}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;box-shadow:0 4px 15px rgba(26,86,219,.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(26,86,219,.5)}
.btn-outline{border:2px solid rgba(255,255,255,.3);color:#fff}
.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.1)}
.hero .swiper-pagination-bullet{width:30px;height:3px;border-radius:2px;background:rgba(255,255,255,.4)}
.hero .swiper-pagination-bullet-active{background:#fff;width:40px}

/* ========================================
   SECTION TITLE
   ======================================== */
.section-title{text-align:center;margin-bottom:48px}
.section-title .subtitle{font-size:14px;font-weight:600;color:var(--primary);text-transform:uppercase;letter-spacing:2px;margin-bottom:8px}
.section-title h2{font-size:clamp(28px,4vw,40px);font-weight:800;color:var(--text-dark);margin-bottom:12px}
.section-title p{font-size:16px;color:var(--text-muted);max-width:600px;margin:0 auto;line-height:1.7}
.section-title.light h2,.section-title.light p{color:var(--text-white)}
.section-title.light .subtitle{color:var(--primary-light)}

/* ========================================
   BUTTONS
   ======================================== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;border-radius:50px;font-size:15px;font-weight:600;transition:all var(--transition);white-space:nowrap}
.btn-sm{padding:8px 20px;font-size:14px}
.btn-lg{padding:16px 40px;font-size:18px}

/* ========================================
   ABOUT SECTION (Home)
   ======================================== */
.about-section{position:relative;padding:100px 0;background:var(--bg-light);overflow:hidden}
.about-section::before{content:'';position:absolute;top:-50%;right:-20%;width:600px;height:600px;background:radial-gradient(circle,rgba(59,130,246,.08) 0%,transparent 70%);border-radius:50%}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;position:relative}
.about-text h3{font-size:28px;font-weight:700;color:var(--text-dark);margin-bottom:20px;line-height:1.3}
.about-text p{font-size:16px;color:var(--text-body);line-height:1.8;margin-bottom:16px}
.about-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:32px}
.about-stat{text-align:center;padding:20px;background:var(--bg-white);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
.about-stat .num{font-size:32px;font-weight:800;color:var(--primary);line-height:1}
.about-stat .label{font-size:13px;color:var(--text-muted);margin-top:6px}
.about-image{position:relative}
.about-image img{border-radius:var(--radius);box-shadow:var(--shadow-lg)}
.about-image::after{content:'';position:absolute;top:20px;left:20px;right:-20px;bottom:-20px;border:3px solid var(--primary-light);border-radius:var(--radius);z-index:-1;opacity:.3}

@media(max-width:768px){
  .about-grid{grid-template-columns:1fr;gap:40px}
  .about-stats{grid-template-columns:repeat(3,1fr);gap:12px}
  .about-stat{padding:16px 8px}
  .about-stat .num{font-size:24px}
  .about-image::after{display:none}
}

/* ========================================
   PRODUCTS SECTION (Home)
   ======================================== */
.products-section{padding:100px 0;background:var(--bg-white)}
.products-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.product-card{background:var(--bg-white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:all var(--transition);border:1px solid var(--border);cursor:pointer}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--primary-light)}
.product-card .card-img{height:180px;overflow:hidden;background:var(--bg-light)}
.product-card .card-img img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition)}
.product-card:hover .card-img img{transform:scale(1.05)}
.product-card .card-body{padding:16px}
.product-card .card-body h4{font-size:16px;font-weight:600;color:var(--text-dark);margin-bottom:8px}
.product-card .card-body .tag{display:inline-block;padding:4px 12px;background:rgba(26,86,219,.1);color:var(--primary);border-radius:20px;font-size:12px;font-weight:500}
.card-desc{font-size:13px;color:var(--text-muted);line-height:1.6;margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}

/* Case Detail Modal */
.case-modal-overlay{position:fixed;inset:0;background:rgba(15,23,42,.85);z-index:2000;display:flex;align-items:center;justify-content:center;padding:24px;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.case-modal{background:var(--bg-white);border-radius:var(--radius);max-width:700px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:0 25px 60px rgba(0,0,0,.3);position:relative}
.case-modal-close{position:absolute;top:16px;right:16px;z-index:10;width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.9);color:var(--text-dark);font-size:22px;display:flex;align-items:center;justify-content:center;border:none;cursor:pointer;transition:all var(--transition)}
.case-modal-close:hover{background:#fff;transform:scale(1.1)}
.case-modal-img{width:100%;height:300px;overflow:hidden;background:var(--bg-dark)}
.case-modal-img img{width:100%;height:100%;object-fit:cover}
.case-modal-body{padding:32px}
.case-modal-body h2{font-size:24px;font-weight:700;color:var(--text-dark);margin:12px 0 20px}
.case-modal-body .tag{display:inline-block;padding:4px 14px;background:rgba(26,86,219,.1);color:var(--primary);border-radius:20px;font-size:13px;font-weight:600}
.case-modal-desc p{font-size:15px;line-height:1.9;color:var(--text-body)}
@media(max-width:640px){
  .case-modal-img{height:200px}
  .case-modal-body{padding:24px}
  .case-modal-body h2{font-size:20px}
}

/* ========================================
   ADVANTAGES SECTION
   ======================================== */
.advantages-section{padding:100px 0;background:linear-gradient(180deg,var(--bg-dark),#1a1f36)}
.advantages-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.advantage-card{text-align:center;padding:40px 24px;background:rgba(255,255,255,.03);border-radius:var(--radius);border:1px solid rgba(255,255,255,.06);transition:all var(--transition)}
.advantage-card:hover{background:rgba(255,255,255,.06);transform:translateY(-4px)}
.advantage-card .icon{width:64px;height:64px;margin:0 auto 20px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:linear-gradient(135deg,rgba(26,86,219,.3),rgba(59,130,246,.1));font-size:28px}
.advantage-card h4{font-size:18px;font-weight:700;color:#fff;margin-bottom:8px}
.advantage-card h4 span{display:block;font-size:12px;font-weight:400;color:var(--text-muted);margin-top:4px;text-transform:uppercase;letter-spacing:1px}
.advantage-card p{font-size:14px;color:var(--text-muted);line-height:1.7}

@media(max-width:992px){.advantages-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.advantages-grid{grid-template-columns:1fr}}

/* ========================================
   CTA SECTION
   ======================================== */
.cta-section{padding:80px 0;background:linear-gradient(135deg,var(--primary-dark),var(--primary));text-align:center}
.cta-section h2{font-size:clamp(28px,4vw,36px);color:#fff;font-weight:800;margin-bottom:12px}
.cta-section p{font-size:16px;color:rgba(255,255,255,.7);margin-bottom:32px}
.cta-section .btn{border:2px solid rgba(255,255,255,.3);color:#fff}
.cta-section .btn:hover{background:#fff;color:var(--primary);border-color:#fff}

/* ========================================
   FOOTER
   ======================================== */
.footer{background:var(--bg-dark);padding:80px 0 0;color:var(--text-light)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1.5fr;gap:40px;padding-bottom:40px}
.footer h3{font-size:18px;font-weight:700;color:#fff;margin-bottom:20px}
.footer-info p{font-size:14px;line-height:2;color:var(--text-muted)}
.footer-qr{text-align:center}
.footer-qr img{width:160px;border-radius:var(--radius-sm);background:#fff;padding:8px;margin:0 auto 12px}
.footer-qr p{font-size:13px;color:var(--text-muted)}
.footer-form{display:flex;flex-direction:column;gap:12px}
.footer-form input,.footer-form textarea{width:100%;padding:12px 16px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);color:#fff;font-size:14px;transition:all var(--transition)}
.footer-form input:focus,.footer-form textarea:focus{outline:none;border-color:var(--primary-light);background:rgba(255,255,255,.1)}
.footer-form input::placeholder,.footer-form textarea::placeholder{color:rgba(255,255,255,.3)}
.footer-form textarea{height:80px;resize:none}
.footer-form .btn{background:var(--accent);color:#fff;width:100%}
.footer-form .btn:hover{background:var(--accent-hover)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding:24px 0;text-align:center}
.footer-links{display:flex;justify-content:center;flex-wrap:wrap;gap:4px;margin-bottom:12px}
.footer-links a{padding:8px 16px;font-size:13px;color:var(--text-muted);transition:color var(--transition)}
.footer-links a:hover{color:#fff}
.footer-bottom p{font-size:12px;color:rgba(255,255,255,.25);line-height:1.8}
.footer-bottom a{color:rgba(255,255,255,.3);transition:color var(--transition)}
.footer-bottom a:hover{color:rgba(255,255,255,.6)}

@media(max-width:768px){
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-qr{text-align:left}
}

/* ========================================
   PAGE HEADER (Inner pages)
   ======================================== */
.page-header{padding:120px 0 60px;background:linear-gradient(135deg,var(--bg-dark),#1e293b);text-align:center}
.page-header h1{font-size:clamp(28px,4vw,40px);font-weight:800;color:#fff;margin-bottom:8px}
.page-header .breadcrumb{font-size:14px;color:var(--text-muted)}
.page-header .breadcrumb a{color:var(--text-light);transition:color var(--transition)}
.page-header .breadcrumb a:hover{color:#fff}

/* ========================================
   TWO COLUMN LAYOUT (About, Products, Register)
   ======================================== */
.page-layout{display:grid;grid-template-columns:280px 1fr;gap:32px;padding:60px 0}
.page-sidebar{position:sticky;top:88px;align-self:start}
.sidebar-card{background:var(--bg-light);border-radius:var(--radius);overflow:hidden}
.sidebar-card .sidebar-title{padding:24px 20px;background:linear-gradient(135deg,var(--primary-dark),var(--primary));color:#fff;font-size:18px;font-weight:700}
.sidebar-card .sidebar-nav a{display:block;padding:14px 20px;font-size:15px;color:var(--text-body);border-bottom:1px solid var(--border);transition:all var(--transition)}
.sidebar-card .sidebar-nav a:hover,.sidebar-card .sidebar-nav a.active{color:var(--primary);background:#fff;padding-left:24px}
.sidebar-card .sidebar-contact{padding:20px}
.sidebar-card .sidebar-contact img{width:100%;border-radius:var(--radius-sm);margin-bottom:16px}
.sidebar-card .sidebar-contact p{font-size:13px;color:var(--text-body);line-height:2}
.page-main{min-width:0}
.page-main .content-card{background:var(--bg-white);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow-sm);border:1px solid var(--border)}
.page-main .content-card p{font-size:15px;line-height:1.8;color:var(--text-body);margin-bottom:16px}

@media(max-width:768px){
  .page-layout{grid-template-columns:1fr}
}

/* ========================================
   PRODUCTS PAGE - Video List
   ======================================== */
.video-list{display:flex;flex-direction:column;gap:20px}
.video-item{display:flex;gap:24px;background:var(--bg-light);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:all var(--transition);border:1px solid transparent}
.video-item:hover{background:var(--bg-white);box-shadow:var(--shadow);border-color:var(--border);transform:translateX(4px)}
.video-item-player{width:320px;flex-shrink:0;background:#000}
.video-item-player video{width:100%;height:100%;min-height:200px;display:block;object-fit:cover}
.video-item-info{flex:1;padding:20px 24px 20px 0;display:flex;flex-direction:column;justify-content:center;min-width:0}
.video-item-header{display:flex;align-items:center;gap:12px;margin-bottom:12px;flex-wrap:wrap}
.video-item-header h3{font-size:18px;font-weight:700;color:var(--text-dark);margin:0}
.video-item-header .tag{display:inline-block;padding:3px 12px;background:rgba(26,86,219,.1);color:var(--primary);border-radius:20px;font-size:12px;font-weight:600;white-space:nowrap}
.video-item-desc{font-size:14px;color:var(--text-muted);line-height:1.7;margin-bottom:8px}
.video-item-more{font-size:13px;color:var(--primary);font-weight:600}
.video-item:hover .video-item-more{text-decoration:underline}

/* Sidebar count badge */
.sidebar-nav .count{display:inline-block;min-width:22px;height:22px;line-height:22px;text-align:center;background:rgba(26,86,219,.1);color:var(--primary);border-radius:11px;font-size:11px;font-weight:700;margin-right:4px}
.sidebar-nav a.active .count{background:var(--primary);color:#fff}

@media(max-width:768px){
  .video-item{flex-direction:column}
  .video-item-player{width:100%}
  .video-item-player video{min-height:220px}
  .video-item-info{padding:16px}
}

/* Old grid layout (kept for backward compatibility) */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(360px,1fr));gap:24px}
.video-card{background:var(--bg-white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);border:1px solid var(--border);transition:all var(--transition)}
.video-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.video-card video{width:100%;height:240px;object-fit:cover;background:#000}
.video-card .video-body{padding:16px}
.video-card .video-body h4{font-size:16px;font-weight:600;color:var(--text-dark)}
@media(max-width:640px){.video-grid{grid-template-columns:1fr}}

/* ========================================
   REGISTER PAGE
   ======================================== */
.register-form{max-width:480px}
.register-form .form-group{margin-bottom:20px}
.register-form label{display:block;font-size:14px;font-weight:600;color:var(--text-dark);margin-bottom:6px}
.register-form select,.register-form input{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:15px;color:var(--text-dark);background:var(--bg-light);transition:all var(--transition)}
.register-form select:focus,.register-form input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(26,86,219,.1)}
.register-form .btn{width:100%}

/* ========================================
   DASHBOARD IFRAME
   ======================================== */
.dashboard-frame{width:100%;min-height:calc(100vh - 72px);border:none;display:block}

/* ========================================
   SCROLL ANIMATIONS
   ======================================== */
.reveal{opacity:0;transform:translateY(30px);transition:all .6s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-delay-1{transition-delay:.1s}
.reveal-delay-2{transition-delay:.2s}
.reveal-delay-3{transition-delay:.3s}
.reveal-delay-4{transition-delay:.4s}

/* ========================================
   UTILITY
   ======================================== */
.text-center{text-align:center}
.mt-1{margin-top:8px}
.mt-2{margin-top:16px}
.mt-3{margin-top:24px}
.mt-4{margin-top:32px}
.mb-1{margin-bottom:8px}
.mb-2{margin-bottom:16px}
.mb-3{margin-bottom:24px}
.mb-4{margin-bottom:32px}
.py-section{padding:100px 0}
@media(max-width:768px){.py-section{padding:60px 0}}