/* Kulsian VPN - shared styles */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#1f2937;line-height:1.6;background:#fff;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid #eef1f5}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:700;color:#2563eb}
.logo svg{width:32px;height:32px}
.nav-menu{display:flex;align-items:center;gap:36px}
.nav-menu a{font-size:15px;color:#4b5563;font-weight:500;transition:color .2s}
.nav-menu a:hover,.nav-menu a.active{color:#2563eb}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 22px;border-radius:8px;font-weight:600;font-size:15px;cursor:pointer;transition:all .25s;border:2px solid transparent}
.btn-primary{background:#2563eb;color:#fff}
.btn-primary:hover{background:#1d4ed8;transform:translateY(-1px);box-shadow:0 6px 20px rgba(37,99,235,.35)}
.btn-outline{background:transparent;color:#fff;border-color:#fff}
.btn-outline:hover{background:#fff;color:#2563eb}
.btn-white{background:#fff;color:#2563eb}
.btn-white:hover{background:#f1f5ff}
.btn-lg{padding:14px 34px;font-size:16px}
.lang-switch{font-size:14px;color:#6b7280;margin-left:8px}
.lang-switch a{padding:4px 8px;border-radius:6px}
.lang-switch a.active{background:#eff6ff;color:#2563eb;font-weight:600}

/* Hero */
.hero{background:linear-gradient(135deg,#1e40af 0%,#2563eb 50%,#3b82f6 100%);color:#fff;padding:110px 0 120px;text-align:center}
.hero h1{font-size:56px;font-weight:800;letter-spacing:-.5px;margin-bottom:20px;line-height:1.15}
.hero .sub{font-size:19px;opacity:.92;margin-bottom:44px}
.hero-cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:40px}
.hero-badges{display:flex;gap:36px;justify-content:center;flex-wrap:wrap;font-size:15px;opacity:.9}
.hero-badges span::before{content:"✔ ";color:#a7f3d0}

/* Sections */
section{padding:90px 0}
.section-title{text-align:center;margin-bottom:60px}
.section-title h2{font-size:38px;font-weight:700;color:#111827;margin-bottom:14px}
.section-title p{color:#6b7280;font-size:17px}

/* Feature grid */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
.card{background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:36px 28px;transition:all .3s;text-align:center}
.card:hover{transform:translateY(-6px);box-shadow:0 20px 40px rgba(0,0,0,.08);border-color:#2563eb}
.card .icon{width:64px;height:64px;margin:0 auto 20px;border-radius:16px;background:#eff6ff;display:flex;align-items:center;justify-content:center;font-size:32px}
.card h3{font-size:20px;font-weight:700;color:#111827;margin-bottom:12px}
.card p{color:#6b7280;font-size:15px}

/* Split content */
.split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.split .text h2{font-size:36px;font-weight:700;margin-bottom:20px;color:#111827}
.split .text p{color:#4b5563;font-size:16px;margin-bottom:16px}
.mockup{background:linear-gradient(135deg,#eff6ff,#dbeafe);border-radius:20px;padding:60px 40px;text-align:center;box-shadow:0 30px 60px rgba(37,99,235,.15)}
.mockup .connect-btn{width:140px;height:140px;border-radius:50%;background:linear-gradient(135deg,#2563eb,#3b82f6);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;margin:0 auto 24px;box-shadow:0 10px 30px rgba(37,99,235,.4)}
.mockup .status{color:#059669;font-weight:600}

/* Testimonials */
.testimonials{background:#f9fafb}
.review{background:#fff;padding:32px;border-radius:16px;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.stars{color:#fbbf24;margin-bottom:14px;font-size:16px}
.review p{color:#374151;font-style:italic;margin-bottom:20px}
.reviewer{display:flex;align-items:center;gap:12px}
.avatar{width:44px;height:44px;border-radius:50%;background:#2563eb;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.reviewer div{font-size:14px}
.reviewer .name{font-weight:600;color:#111827}
.reviewer .role{color:#6b7280;font-size:13px}

.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}
.stat{text-align:center;padding:24px;background:#fff;border-radius:12px}
.stat .num{font-size:36px;font-weight:800;color:#2563eb;margin-bottom:6px}
.stat .lbl{color:#6b7280;font-size:14px}

/* Download */
.downloads{background:linear-gradient(180deg,#f9fafb,#fff)}
.dl-card{padding:40px 24px}
.dl-card .icon{font-size:44px}

/* Footer */
.site-footer{background:#0f172a;color:#94a3b8;padding:60px 0 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand h4{color:#fff;font-size:20px;margin-bottom:12px}
.footer-brand p{font-size:14px;line-height:1.7}
.footer-col h5{color:#fff;font-size:15px;margin-bottom:16px;font-weight:600}
.footer-col a{display:block;font-size:14px;color:#94a3b8;padding:6px 0;transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #1e293b;padding-top:24px;text-align:center;font-size:13px;color:#64748b}

/* Content pages */
.page-header{background:linear-gradient(135deg,#1e40af,#2563eb);color:#fff;padding:80px 0 60px;text-align:center}
.page-header h1{font-size:44px;font-weight:800;margin-bottom:14px}
.page-header p{font-size:18px;opacity:.9}
.content{padding:70px 0;max-width:860px;margin:0 auto}
.content h2{font-size:28px;font-weight:700;color:#111827;margin:40px 0 16px}
.content h3{font-size:20px;font-weight:600;color:#1f2937;margin:28px 0 12px}
.content p{color:#4b5563;margin-bottom:16px;font-size:16px}
.content ul{margin:16px 0 20px 24px;color:#4b5563}
.content li{margin-bottom:8px}
.content strong{color:#111827}

/* Guide steps */
.steps{counter-reset:step;display:grid;gap:24px;margin-top:30px}
.step{background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:28px;display:flex;gap:20px}
.step::before{counter-increment:step;content:counter(step);flex:none;width:44px;height:44px;border-radius:50%;background:#2563eb;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px}
.step h3{font-size:18px;font-weight:700;margin-bottom:6px;color:#111827}
.step p{color:#6b7280;font-size:15px;margin:0}

/* Responsive */
@media (max-width:900px){
  .hero h1{font-size:38px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:1fr}
  .grid-2,.split{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .nav-menu{gap:18px}
  .nav-menu a:not(.btn):not(.lang-switch a){display:none}
  .section-title h2{font-size:28px}
  .stats{grid-template-columns:1fr}
}