/* ═══════════════════════════════════════════
   iOS 26 Glass Design System — Full Responsive
   ═══════════════════════════════════════════ */

:root {
    --glass-bg: rgba(255,255,255,0.72);
    --glass-bg-heavy: rgba(255,255,255,0.85);
    --glass-border: rgba(255,255,255,0.18);
    --glass-shadow: 0 8px 32px rgba(0,0,0,0.06);
    --glass-blur: blur(20px) saturate(180%);
    --glass-r: 20px;
    --glass-r-sm: 14px;
    --glass-r-xs: 10px;

    --primary: #0071e3;
    --primary-light: rgba(0,113,227,0.08);
    --success: #30d158;
    --warning: #ff9f0a;
    --danger: #ff453a;
    --text-1: #1d1d1f;
    --text-2: #6e6e73;
    --text-3: #86868b;
    --bg: #f2f2f7;
    --wash: rgba(118,118,128,0.12);
    --ease: cubic-bezier(0.25,0.46,0.45,0.94);
}

*{margin:0;padding:0;box-sizing:border-box}

body{
    font-family:-apple-system,BlinkMacSystemFont,'SF Pro Display','SF Pro Text',
    'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
    background:var(--bg);color:var(--text-1);line-height:1.6;
    -webkit-font-smoothing:antialiased;min-height:100vh;overflow-x:hidden;
}

.bg-mesh{
    position:fixed;inset:0;z-index:-1;
    background:
        radial-gradient(ellipse at 20% 50%,rgba(0,113,227,0.08) 0%,transparent 50%),
        radial-gradient(ellipse at 80% 20%,rgba(48,209,88,0.06) 0%,transparent 50%),
        radial-gradient(ellipse at 60% 80%,rgba(255,159,10,0.05) 0%,transparent 50%),
        var(--bg);
}

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

/* ── Glass ── */
.glass,.glass-static{
    background:var(--glass-bg);
    backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);
    border:1px solid var(--glass-border);border-radius:var(--glass-r);
    box-shadow:var(--glass-shadow);transition:all 0.35s var(--ease);
}
.glass:hover{box-shadow:0 12px 40px rgba(0,0,0,0.08);transform:translateY(-2px)}
.glass-heavy{
    background:var(--glass-bg-heavy);
    backdrop-filter:blur(40px) saturate(200%);-webkit-backdrop-filter:blur(40px) saturate(200%);
    border:1px solid rgba(255,255,255,0.3);border-radius:var(--glass-r);
    box-shadow:0 16px 48px rgba(0,0,0,0.08);
}

/* ── Nav ── */
nav{
    position:sticky;top:0;z-index:100;
    background:rgba(255,255,255,0.72);
    backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);
    border-bottom:1px solid var(--glass-border);
}
.nav-container{
    display:flex;align-items:center;justify-content:space-between;
    height:60px;max-width:1200px;margin:0 auto;padding:0 24px;
}
.nav-logo{font-size:20px;font-weight:700;color:var(--text-1);text-decoration:none;letter-spacing:-0.5px}
.nav-logo span{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:32px;list-style:none}
.nav-links a{color:var(--text-2);text-decoration:none;font-size:15px;font-weight:500;transition:all 0.2s;position:relative}
.nav-links a:hover,.nav-links a.active{color:var(--primary)}
.nav-links a.active::after{content:'';position:absolute;bottom:-6px;left:0;right:0;height:2px;background:var(--primary);border-radius:1px}
.nav-auth{display:flex;align-items:center;gap:12px}

/* Mobile hamburger */
.nav-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer;padding:4px;color:var(--text-1)}
.nav-mobile-auth{display:none}

/* ── Buttons ── */
.btn{
    display:inline-flex;align-items:center;justify-content:center;gap:6px;
    padding:10px 24px;border:none;border-radius:980px;
    font-size:15px;font-weight:500;cursor:pointer;
    transition:all 0.25s var(--ease);text-decoration:none;line-height:1.4;
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:#0077ed;transform:scale(1.02);box-shadow:0 4px 16px rgba(0,113,227,0.3)}
.btn-secondary{background:var(--wash);color:var(--text-1)}
.btn-secondary:hover{background:rgba(118,118,128,0.2)}
.btn-danger{background:var(--danger);color:#fff}
.btn-success{background:var(--success);color:#fff}
.btn-glass{background:rgba(255,255,255,0.5);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,0.3);color:var(--text-1)}
.btn-glass:hover{background:rgba(255,255,255,0.7);transform:scale(1.02)}
.btn-sm{padding:6px 16px;font-size:13px}
.btn-lg{padding:14px 32px;font-size:17px}

/* ── Hero ── */
.hero{padding:100px 0 60px;text-align:center;position:relative;overflow:hidden}
.hero::before{
    content:'';position:absolute;top:-50%;left:-20%;width:140%;height:200%;
    background:
        radial-gradient(circle at 30% 40%,rgba(0,113,227,0.12) 0%,transparent 40%),
        radial-gradient(circle at 70% 60%,rgba(48,209,88,0.08) 0%,transparent 40%),
        radial-gradient(circle at 50% 30%,rgba(255,159,10,0.06) 0%,transparent 40%);
    animation:meshFloat 20s ease-in-out infinite;z-index:-1;
}
@keyframes meshFloat{0%,100%{transform:translate(0,0) rotate(0deg)}33%{transform:translate(2%,-1%) rotate(1deg)}66%{transform:translate(-1%,1%) rotate(-1deg)}}
.hero h1{
    font-size:clamp(32px,6vw,64px);font-weight:700;letter-spacing:-1.5px;margin-bottom:20px;line-height:1.1;
    background:linear-gradient(135deg,var(--text-1) 0%,var(--primary) 100%);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero p{font-size:clamp(16px,2.5vw,21px);color:var(--text-2);max-width:560px;margin:0 auto 36px;line-height:1.5}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

.trust-row{display:flex;gap:8px;justify-content:center;align-items:center;margin-top:40px;flex-wrap:wrap}
.trust-item{font-size:13px;color:var(--text-3);font-weight:500}
.trust-dot{color:var(--text-3);font-size:13px}

/* Stats bar */
.stats-bar{
    display:flex;justify-content:space-around;align-items:center;
    padding:28px 20px;border-radius:var(--glass-r);flex-wrap:wrap;gap:16px;
}
.stats-item{text-align:center;min-width:80px}
.stats-num{font-size:clamp(24px,3vw,32px);font-weight:700;color:var(--primary);letter-spacing:-0.5px}
.stats-label{font-size:13px;color:var(--text-3);margin-top:2px}
.stats-divider{width:1px;height:40px;background:rgba(0,0,0,0.06)}

/* ── Banner ── */
.banner-wrap{position:relative;overflow:hidden;border-radius:var(--glass-r)}
.banner-slide{
    min-height:220px;padding:48px 40px;text-align:center;
    flex-direction:column;align-items:center;justify-content:center;
    backdrop-filter:blur(10px);border-radius:var(--glass-r);
}
.banner-inner{display:flex;align-items:center;justify-content:center;gap:40px;max-width:800px;margin:0 auto;flex-wrap:wrap}
.banner-img{max-height:160px;border-radius:var(--glass-r-sm);object-fit:contain}
.banner-text{text-align:left}
.banner-text h2{font-size:clamp(20px,3vw,28px);font-weight:600;margin-bottom:8px}
.banner-text p{font-size:15px;opacity:0.9;margin-bottom:12px}
.banner-dots{display:flex;justify-content:center;gap:8px;margin-top:16px}
.banner-dot{width:8px;height:8px;border-radius:50%;border:none;background:rgba(0,0,0,0.15);cursor:pointer;transition:all 0.3s;padding:0}
.banner-dot.active{background:var(--primary);width:24px;border-radius:4px}

/* ── Section ── */
.section{padding:72px 0}
.section-title{font-size:clamp(24px,4vw,32px);font-weight:700;letter-spacing:-0.5px;margin-bottom:12px;text-align:center}
.section-subtitle{font-size:clamp(14px,2vw,17px);color:var(--text-2);text-align:center;margin-bottom:44px}

/* ── Plan Cards ── */
.plans-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.plan-card{padding:32px;position:relative;overflow:hidden}
.plan-card .badge{position:absolute;top:16px;right:16px;padding:4px 12px;border-radius:980px;font-size:12px;font-weight:600;background:var(--primary);color:#fff}
.plan-card .plan-icon{width:56px;height:56px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:28px;margin-bottom:20px;background:var(--primary-light)}
.plan-card h3{font-size:22px;font-weight:600;margin-bottom:8px}
.plan-card .plan-desc{color:var(--text-2);font-size:14px;margin-bottom:20px;line-height:1.5}
.plan-card .plan-price{font-size:clamp(32px,4vw,40px);font-weight:700;color:var(--primary);margin-bottom:4px}
.plan-card .plan-price small{font-size:16px;color:var(--text-2);font-weight:400}
.plan-card .plan-original{font-size:14px;color:var(--text-3);text-decoration:line-through;margin-bottom:20px}
.plan-card .plan-features{list-style:none;margin-bottom:24px}
.plan-card .plan-features li{padding:8px 0;font-size:14px;color:var(--text-2);display:flex;align-items:center;gap:8px}
.plan-card .plan-features li::before{content:'✓';color:var(--success);font-weight:700;font-size:13px}

/* ── Features ── */
.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}
.feature-card{padding:32px 24px;text-align:center}
.feature-card .feature-icon{width:64px;height:64px;border-radius:18px;display:flex;align-items:center;justify-content:center;font-size:32px;margin:0 auto 20px;background:var(--primary-light)}
.feature-card h3{font-size:18px;font-weight:600;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-2);line-height:1.6}

/* ── Steps ── */
.steps-grid{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap}
.step-card{padding:28px 32px;text-align:center;flex:1;min-width:180px;max-width:260px}
.step-num{width:48px;height:48px;border-radius:50%;background:var(--primary);color:#fff;font-size:20px;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.step-card h3{font-size:17px;font-weight:600;margin-bottom:6px}
.step-card p{font-size:14px;color:var(--text-2)}
.step-arrow{font-size:24px;color:var(--text-3);font-weight:300}

/* ── Node Cards ── */
.nodes-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.node-card{padding:20px 24px;display:flex;align-items:center;gap:14px}
.node-card .node-status{width:10px;height:10px;border-radius:50%;flex-shrink:0}
.node-card .node-status.online{background:var(--success);box-shadow:0 0 8px rgba(48,209,88,0.4)}
.node-card .node-status.offline{background:var(--danger)}
.node-card .node-info{flex:1}
.node-card .node-info h4{font-size:15px;font-weight:600;margin-bottom:2px}
.node-card .node-info p{font-size:12px;color:var(--text-3)}

/* ── CTA ── */
.cta-box{padding:60px 40px;text-align:center;border-radius:var(--glass-r)}
.cta-box h2{font-size:clamp(22px,3vw,28px);font-weight:700;margin-bottom:12px}
.cta-box p{color:var(--text-2);font-size:16px;margin-bottom:28px}

/* ── Forms ── */
.glass-form{max-width:420px;margin:0 auto;padding:40px}
.glass-form h2{font-size:28px;font-weight:700;text-align:center;margin-bottom:8px}
.glass-form .form-subtitle{text-align:center;color:var(--text-2);margin-bottom:32px;font-size:15px}
.form-group{margin-bottom:20px}
.form-group label{display:block;margin-bottom:6px;font-size:14px;font-weight:500;color:var(--text-2)}
.form-group input,.form-group select,.form-group textarea{
    width:100%;padding:12px 16px;border:1px solid rgba(0,0,0,0.08);border-radius:var(--glass-r-xs);
    font-size:16px;background:rgba(255,255,255,0.6);backdrop-filter:blur(10px);transition:all 0.2s;font-family:inherit;
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(0,113,227,0.12);background:rgba(255,255,255,0.8)}

/* ── Dashboard ── */
.sub-card{padding:24px;margin-bottom:16px}
.sub-card .sub-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.sub-card .sub-header h3{font-size:18px;font-weight:600}
.sub-card .sub-detail{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-bottom:16px}
.sub-card .sub-detail .detail-item{display:flex;flex-direction:column;gap:2px}
.sub-card .sub-detail .detail-label{font-size:12px;color:var(--text-3);text-transform:uppercase;letter-spacing:0.5px}
.sub-card .sub-detail .detail-value{font-size:15px;font-weight:500}
.traffic-bar{height:6px;background:var(--wash);border-radius:3px;overflow:hidden;margin-top:12px}
.traffic-bar .traffic-fill{height:100%;border-radius:3px;background:linear-gradient(90deg,var(--primary),var(--success));transition:width 0.6s ease}

/* ── Payment ── */
.payment-card{max-width:480px;margin:40px auto;padding:40px;text-align:center}

/* ── Badges ── */
.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:980px;font-size:12px;font-weight:600}
.badge-success{background:rgba(48,209,88,0.12);color:#1a8d3d}
.badge-warning{background:rgba(255,159,10,0.12);color:#b36b00}
.badge-danger{background:rgba(255,69,58,0.12);color:#cc2e26}
.badge-info{background:rgba(0,113,227,0.12);color:#0055b3}
.badge-secondary{background:var(--wash);color:var(--text-2)}

/* ── Flash ── */
.flash-messages{position:fixed;top:72px;right:24px;z-index:1000;display:flex;flex-direction:column;gap:8px}
.flash-message{
    padding:14px 20px;border-radius:var(--glass-r-sm);font-size:14px;font-weight:500;
    backdrop-filter:var(--glass-blur);box-shadow:0 8px 24px rgba(0,0,0,0.08);
    animation:slideIn 0.4s var(--ease);max-width:380px;border:1px solid var(--glass-border);
}
.flash-success{background:rgba(48,209,88,0.15);color:#135e29;border-color:rgba(48,209,88,0.2)}
.flash-error{background:rgba(255,69,58,0.12);color:#8b1a15;border-color:rgba(255,69,58,0.2)}
.flash-warning{background:rgba(255,159,10,0.12);color:#7a4c00;border-color:rgba(255,159,10,0.2)}
@keyframes slideIn{from{opacity:0;transform:translateX(30px) scale(0.95)}to{opacity:1;transform:translateX(0) scale(1)}}

/* ── Footer ── */
footer{padding:48px 0;text-align:center;border-top:1px solid rgba(0,0,0,0.06);color:var(--text-3);font-size:14px}

/* ══════════════════════════════════════════
   RESPONSIVE — Tablet (≤1024px)
   ══════════════════════════════════════════ */
@media (max-width:1024px){
    .plans-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
    .features-grid{grid-template-columns:repeat(2,1fr)}
    .nodes-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
}

/* ══════════════════════════════════════════
   RESPONSIVE — Mobile (≤768px)
   ══════════════════════════════════════════ */
@media (max-width:768px){
    .container{padding:0 16px}

    /* Nav mobile */
    .nav-links{
        display:none;position:absolute;top:60px;left:0;right:0;
        flex-direction:column;gap:0;padding:8px 16px 16px;
        background:rgba(255,255,255,0.95);backdrop-filter:blur(20px);
        border-bottom:1px solid var(--glass-border);
    }
    .nav-links.open{display:flex}
    .nav-links li a{display:block;padding:12px 8px;font-size:16px}
    .nav-toggle{display:block}
    .nav-mobile-auth{display:block;border-top:1px solid rgba(0,0,0,0.06);margin-top:8px;padding-top:8px}
    .nav-mobile-auth a{display:block;padding:10px 8px;color:var(--text-2);text-decoration:none;font-size:15px;font-weight:500}

    /* Hero */
    .hero{padding:60px 0 40px}
    .hero-actions{flex-direction:column;align-items:center}
    .hero-actions .btn{width:100%;max-width:280px;justify-content:center}
    .trust-row{flex-direction:column;gap:4px}
    .trust-dot{display:none}

    /* Stats */
    .stats-bar{flex-direction:column;gap:20px;padding:24px 16px}
    .stats-divider{width:40px;height:1px}

    /* Banner */
    .banner-slide{padding:24px 16px}
    .banner-inner{flex-direction:column;gap:16px;text-align:center}
    .banner-text{text-align:center}
    .banner-img{max-height:120px}

    /* Grids */
    .plans-grid{grid-template-columns:1fr;gap:16px}
    .features-grid{grid-template-columns:1fr 1fr;gap:12px}
    .nodes-grid{grid-template-columns:1fr}
    .steps-grid{flex-direction:column}
    .step-arrow{transform:rotate(90deg);font-size:20px}

    /* Sections */
    .section{padding:48px 0}

    /* Cards */
    .plan-card{padding:24px 20px}
    .feature-card{padding:20px 16px}
    .feature-card .feature-icon{width:52px;height:52px;font-size:26px}

    /* CTA */
    .cta-box{padding:40px 24px}
    .cta-box .btn{width:100%;max-width:280px;justify-content:center}

    /* Forms */
    .glass-form{padding:28px 20px;margin:0 16px}

    /* Flash */
    .flash-messages{top:auto;bottom:20px;right:12px;left:12px}
    .flash-message{max-width:100%}

    /* Payment */
    .payment-card{margin:20px auto;padding:24px}

    /* Dashboard */
    .sub-card .sub-detail{grid-template-columns:1fr 1fr}
}

/* ══════════════════════════════════════════
   RESPONSIVE — Small mobile (≤480px)
   ══════════════════════════════════════════ */
@media (max-width:480px){
    .nav-container{padding:0 16px}
    .nav-logo{font-size:18px}
    .nav-auth .btn-sm{padding:6px 12px;font-size:12px}

    .hero h1{font-size:28px}
    .hero p{font-size:15px}

    .section-title{font-size:22px}
    .section-subtitle{font-size:14px;margin-bottom:28px}

    .features-grid{grid-template-columns:1fr}
    .feature-card{padding:20px}

    .plan-card .plan-price{font-size:28px}

    .btn-lg{padding:12px 24px;font-size:15px}
}

/* ══════════════════════════════════════════
   RESPONSIVE — Large desktop (≥1400px)
   ══════════════════════════════════════════ */
@media (min-width:1400px){
    .container{max-width:1320px}
    .plans-grid{grid-template-columns:repeat(4,1fr)}
    .features-grid{grid-template-columns:repeat(4,1fr)}
}