/* === Reset & Base === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;color:#333;line-height:1.6;background:#fff}
a{text-decoration:none;color:inherit;transition:color .3s}
ul,ol{list-style:none}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3}

/* === Container === */
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* === Navigation === */
.navbar{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.97);backdrop-filter:blur(10px);border-bottom:1px solid #e8edf3;padding:0 0}
.navbar .container{display:flex;align-items:center;justify-content:space-between;height:68px}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:1.35rem;font-weight:800;color:#1a56db}
.nav-logo .logo-icon{width:36px;height:36px;background:linear-gradient(135deg,#1a56db,#3b82f6);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:900;font-size:.9rem}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{padding:8px 16px;border-radius:8px;font-size:.925rem;font-weight:500;color:#4b5563;transition:all .3s}
.nav-links a:hover,.nav-links a.active{color:#1a56db;background:#eff6ff}
.nav-cta{display:flex;align-items:center;gap:10px}
.nav-cta .btn-login{padding:8px 20px;border-radius:8px;font-size:.9rem;font-weight:500;color:#1a56db;border:1.5px solid #1a56db;transition:all .3s}
.nav-cta .btn-login:hover{background:#1a56db;color:#fff}
.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.mobile-toggle span{width:24px;height:2.5px;background:#333;border-radius:2px;transition:all .3s}

/* === Buttons === */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 32px;border-radius:12px;font-size:1rem;font-weight:600;transition:all .3s;cursor:pointer;border:none;gap:8px}
.btn-primary{background:linear-gradient(135deg,#1a56db,#3b82f6);color:#fff;box-shadow:0 4px 14px rgba(26,86,219,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(26,86,219,.45)}
.btn-secondary{background:#fff;color:#1a56db;border:2px solid #1a56db}
.btn-secondary:hover{background:#eff6ff;transform:translateY(-2px)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.6)}
.btn-outline:hover{background:rgba(255,255,255,.15);border-color:#fff}
.btn-sm{padding:10px 22px;font-size:.9rem;border-radius:10px}
.btn-lg{padding:16px 40px;font-size:1.1rem;border-radius:14px}

/* === Hero Section === */
.hero{background:linear-gradient(135deg,#0f172a 0%,#1e3a5f 40%,#1a56db 100%);color:#fff;padding:100px 0 80px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-50%;right:-20%;width:600px;height:600px;background:radial-gradient(circle,rgba(59,130,246,.2) 0%,transparent 70%);border-radius:50%}
.hero::after{content:'';position:absolute;bottom:-30%;left:-10%;width:500px;height:500px;background:radial-gradient(circle,rgba(59,130,246,.15) 0%,transparent 70%);border-radius:50%}
.hero .container{position:relative;z-index:1}
.hero-content{max-width:720px;margin:0 auto;text-align:center}
.hero-badge{display:inline-block;background:rgba(59,130,246,.2);border:1px solid rgba(59,130,246,.4);padding:6px 18px;border-radius:50px;font-size:.85rem;color:#93c5fd;margin-bottom:24px}
.hero h1{font-size:2.8rem;margin-bottom:18px;letter-spacing:-.5px}
.hero h1 span{background:linear-gradient(90deg,#60a5fa,#34d399);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero .subtitle{font-size:1.2rem;color:rgba(255,255,255,.8);margin-bottom:16px;line-height:1.7}
.hero .stats{display:flex;justify-content:center;gap:30px;margin:30px 0 40px;flex-wrap:wrap}
.hero .stats .stat-item{text-align:center}
.hero .stats .stat-num{font-size:1.6rem;font-weight:800;color:#60a5fa}
.hero .stats .stat-label{font-size:.85rem;color:rgba(255,255,255,.6);margin-top:4px}
.hero-buttons{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}

/* === Section Common === */
.section{padding:80px 0}
.section-alt{background:#f8fafc}
.section-dark{background:#0f172a;color:#fff}
.section-header{text-align:center;max-width:680px;margin:0 auto 50px}
.section-header h2{font-size:2.1rem;margin-bottom:14px;color:#111827}
.section-dark .section-header h2{color:#fff}
.section-header p{font-size:1.05rem;color:#6b7280;line-height:1.7}
.section-dark .section-header p{color:rgba(255,255,255,.7)}

/* === Features Grid === */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.feature-card{background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:36px 28px;text-align:center;transition:all .3s}
.feature-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(0,0,0,.08);border-color:#bfdbfe}
.feature-icon{width:64px;height:64px;margin:0 auto 20px;background:linear-gradient(135deg,#eff6ff,#dbeafe);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem}
.feature-card h3{font-size:1.15rem;margin-bottom:10px;color:#111827}
.feature-card p{font-size:.925rem;color:#6b7280;line-height:1.65}

/* === Security / Certifications === */
.cert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.cert-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:36px 28px;text-align:center;transition:all .3s}
.cert-card:hover{background:rgba(255,255,255,.1);transform:translateY(-4px)}
.cert-icon{width:64px;height:64px;margin:0 auto 18px;background:linear-gradient(135deg,#1a56db,#3b82f6);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.6rem;color:#fff}
.cert-card h3{font-size:1.1rem;margin-bottom:8px}
.cert-card p{font-size:.9rem;color:rgba(255,255,255,.65);line-height:1.6}

/* === Pricing === */
.pricing-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px;max-width:900px;margin:0 auto}
.pricing-column h3{font-size:1.3rem;margin-bottom:20px;text-align:center;color:#111827}
.pricing-cards{display:flex;flex-direction:column;gap:14px}
.pricing-card{background:#fff;border:2px solid #e5e7eb;border-radius:14px;padding:22px 24px;display:flex;align-items:center;justify-content:space-between;transition:all .3s}
.pricing-card:hover{border-color:#3b82f6;box-shadow:0 6px 20px rgba(59,130,246,.12)}
.pricing-card.recommended{border-color:#1a56db;background:linear-gradient(135deg,#eff6ff,#fff);position:relative}
.pricing-card.recommended::before{content:'最优惠';position:absolute;top:-1px;right:20px;background:linear-gradient(135deg,#1a56db,#3b82f6);color:#fff;padding:3px 14px;border-radius:0 0 8px 8px;font-size:.75rem;font-weight:600}
.pricing-info .plan-name{font-size:1rem;font-weight:600;color:#111827}
.pricing-info .plan-period{font-size:.85rem;color:#6b7280;margin-top:2px}
.pricing-price{font-size:1.5rem;font-weight:800;color:#1a56db}
.pricing-price small{font-size:.8rem;font-weight:400;color:#6b7280}
.pricing-card .btn-sm{flex-shrink:0;margin-left:16px}
.pricing-note{text-align:center;margin-top:30px;font-size:.9rem;color:#6b7280}

/* === Pricing Comparison Table === */
.comparison-table{max-width:700px;margin:40px auto 0;border-collapse:collapse;width:100%}
.comparison-table th,.comparison-table td{padding:14px 20px;text-align:center;border-bottom:1px solid #e5e7eb}
.comparison-table th{background:#f8fafc;font-weight:600;color:#374151;font-size:.95rem}
.comparison-table td{font-size:.925rem;color:#4b5563}
.comparison-table .check{color:#10b981;font-weight:700;font-size:1.1rem}

/* === Testimonials === */
.testimonials-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.testimonial-card{background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:28px;transition:all .3s}
.testimonial-card:hover{box-shadow:0 8px 30px rgba(0,0,0,.06)}
.testimonial-stars{color:#f59e0b;font-size:1rem;margin-bottom:12px;letter-spacing:2px}
.testimonial-text{font-size:.925rem;color:#4b5563;line-height:1.7;margin-bottom:16px;font-style:italic}
.testimonial-author{font-size:.85rem;font-weight:600;color:#111827}

/* === Download Section === */
.download-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.download-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:36px 20px;text-align:center;transition:all .3s}
.download-card:hover{background:rgba(255,255,255,.12);transform:translateY(-4px)}
.download-icon{font-size:2.5rem;margin-bottom:14px}
.download-card h3{font-size:1.05rem;margin-bottom:6px}
.download-card p{font-size:.8rem;color:rgba(255,255,255,.5);margin-bottom:18px}

/* === Safety Promise === */
.safety-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
.safety-item{text-align:center;padding:24px 12px}
.safety-icon{width:52px;height:52px;margin:0 auto 12px;background:linear-gradient(135deg,#eff6ff,#dbeafe);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.4rem}
.safety-item h4{font-size:.9rem;margin-bottom:6px;color:#111827}
.safety-item p{font-size:.8rem;color:#6b7280}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-category{margin-bottom:40px}
.faq-category h3{font-size:1.25rem;color:#1a56db;margin-bottom:18px;padding-bottom:10px;border-bottom:2px solid #dbeafe}
.faq-item{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:24px;margin-bottom:14px;transition:all .3s}
.faq-item:hover{border-color:#bfdbfe;box-shadow:0 4px 16px rgba(0,0,0,.04)}
.faq-item h4{font-size:1.05rem;color:#111827;margin-bottom:12px}
.faq-item .faq-steps{counter-reset:step}
.faq-item .faq-steps li{counter-increment:step;padding:6px 0 6px 36px;position:relative;font-size:.925rem;color:#4b5563;line-height:1.7}
.faq-item .faq-steps li::before{content:counter(step);position:absolute;left:0;top:6px;width:24px;height:24px;background:#eff6ff;color:#1a56db;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700}

/* === Footer === */
.footer{background:#0f172a;color:rgba(255,255,255,.7);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand .footer-logo{font-size:1.3rem;font-weight:800;color:#fff;margin-bottom:12px}
.footer-brand p{font-size:.9rem;line-height:1.7;color:rgba(255,255,255,.5)}
.footer-col h4{font-size:.95rem;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col a{display:block;font-size:.9rem;color:rgba(255,255,255,.5);padding:4px 0;transition:color .3s}
.footer-col a:hover{color:#60a5fa}
.footer-bottom{padding:20px 0;text-align:center;font-size:.85rem;color:rgba(255,255,255,.4)}
.footer-warning{background:rgba(245,158,11,.1);border:1px solid rgba(245,158,11,.3);border-radius:10px;padding:14px 20px;margin-bottom:30px;text-align:center;font-size:.85rem;color:#fbbf24}

/* === Floating Support === */
.float-support{position:fixed;bottom:30px;right:30px;z-index:999}
.float-support a{display:flex;align-items:center;justify-content:center;width:56px;height:56px;background:linear-gradient(135deg,#1a56db,#3b82f6);border-radius:50%;color:#fff;font-size:1.5rem;box-shadow:0 4px 20px rgba(26,86,219,.4);transition:all .3s}
.float-support a:hover{transform:scale(1.1);box-shadow:0 6px 28px rgba(26,86,219,.5)}

/* === Page Header (for sub pages) === */
.page-header{background:linear-gradient(135deg,#0f172a,#1a56db);color:#fff;padding:60px 0 50px;text-align:center}
.page-header h1{font-size:2.2rem;margin-bottom:12px}
.page-header p{font-size:1.05rem;color:rgba(255,255,255,.7);max-width:600px;margin:0 auto}
.breadcrumb{display:flex;justify-content:center;gap:8px;margin-bottom:20px;font-size:.9rem;color:rgba(255,255,255,.5)}
.breadcrumb a{color:rgba(255,255,255,.7)}
.breadcrumb a:hover{color:#fff}

/* === Content Page === */
.content-section{padding:60px 0}
.content-block{max-width:800px;margin:0 auto}
.content-block h2{font-size:1.5rem;color:#111827;margin:36px 0 14px;padding-bottom:10px;border-bottom:2px solid #eff6ff}
.content-block h3{font-size:1.2rem;color:#1a56db;margin:24px 0 10px}
.content-block p{font-size:.95rem;color:#4b5563;line-height:1.8;margin-bottom:12px}
.content-block ul{padding-left:20px;margin-bottom:14px}
.content-block ul li{font-size:.95rem;color:#4b5563;line-height:1.8;padding:3px 0;position:relative;padding-left:18px}
.content-block ul li::before{content:'';position:absolute;left:0;top:12px;width:6px;height:6px;background:#3b82f6;border-radius:50%}

/* === Download Page Platforms === */
.platform-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px;max-width:800px;margin:0 auto}
.platform-card{background:#fff;border:2px solid #e5e7eb;border-radius:18px;padding:40px 30px;text-align:center;transition:all .3s}
.platform-card:hover{border-color:#3b82f6;box-shadow:0 8px 30px rgba(59,130,246,.12);transform:translateY(-4px)}
.platform-icon{font-size:3rem;margin-bottom:16px}
.platform-card h3{font-size:1.2rem;margin-bottom:6px;color:#111827}
.platform-card .platform-ver{font-size:.85rem;color:#6b7280;margin-bottom:20px}

/* === Responsive === */
@media(max-width:1024px){
  .features-grid,.testimonials-grid{grid-template-columns:repeat(2,1fr)}
  .cert-grid{grid-template-columns:repeat(2,1fr)}
  .download-grid{grid-template-columns:repeat(2,1fr)}
  .safety-grid{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-links{display:none}
  .nav-cta .btn-login{display:none}
  .mobile-toggle{display:flex}
  .hero{padding:60px 0 50px}
  .hero h1{font-size:2rem}
  .hero .subtitle{font-size:1rem}
  .hero .stats{gap:20px}
  .section{padding:50px 0}
  .section-header h2{font-size:1.6rem}
  .features-grid,.testimonials-grid,.cert-grid{grid-template-columns:1fr}
  .pricing-grid{grid-template-columns:1fr}
  .download-grid{grid-template-columns:1fr}
  .platform-grid{grid-template-columns:1fr}
  .safety-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr}
  .page-header h1{font-size:1.7rem}
}
@media(max-width:480px){
  .hero h1{font-size:1.6rem}
  .hero-buttons{flex-direction:column;align-items:center}
  .btn-lg{padding:14px 32px;font-size:1rem}
  .safety-grid{grid-template-columns:1fr}
}