:root {
    --bg: #ffffff;
    --bg-2: #f5f7fa;
    --bg-3: #eef1f6;
    --card: #ffffff;
    --card-border: #e2e8f0;
    --text: #1a202c;
    --text-2: #4a5568;
    --text-3: #718096;
    --accent: #4285f4;
    --accent-hover: #3367d6;
    --accent-soft: rgba(66,133,244,0.1);
    --green: #34a853;
    --green-soft: rgba(52,168,83,0.1);
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.08), 0 12px 40px rgba(0,0,0,0.06);
    --radius: 16px;
    --radius-sm: 10px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1117;
        --bg-2: #161922;
        --bg-3: #1e2231;
        --card: #1a1e2b;
        --card-border: #2d3348;
        --text: #e8eaf0;
        --text-2: #a0a8bc;
        --text-3: #6b7394;
        --accent: #5b9aff;
        --accent-hover: #4285f4;
        --accent-soft: rgba(91,154,255,0.12);
        --green: #4ade80;
        --green-soft: rgba(74,222,128,0.1);
        --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.2);
        --shadow-lg: 0 4px 16px rgba(0,0,0,0.3), 0 12px 40px rgba(0,0,0,0.25);
    }
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none;transition:all .2s}
a:hover{color:var(--accent-hover)}
.inner{max-width:1100px;margin:0 auto;padding:0 24px}

/* Header */
header{position:sticky;top:0;z-index:100;background:var(--bg);border-bottom:1px solid var(--card-border);backdrop-filter:blur(12px)}
.header-inner{max-width:1100px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.25rem;color:var(--text)}
.logo-img{width:32px;height:32px;border-radius:8px}
nav{display:flex;gap:28px}
nav a{color:var(--text-2);font-size:.9rem;font-weight:500}
nav a:hover{color:var(--accent)}
.burger{display:none;background:none;border:none;cursor:pointer;padding:4px}
.burger span{display:block;width:22px;height:2px;background:var(--text);margin:5px 0;border-radius:2px}
.mob-menu{display:none;flex-direction:column;padding:16px 24px;gap:16px;border-bottom:1px solid var(--card-border);background:var(--bg)}
.mob-menu.open{display:flex}
.mob-menu a{color:var(--text-2);font-weight:500;font-size:1rem}
@media(max-width:768px){
    nav{display:none}
    .burger{display:block}
}

/* Hero */
.hero{padding:80px 0 60px;text-align:center}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:var(--accent-soft);color:var(--accent);padding:6px 16px;border-radius:50px;font-size:.85rem;font-weight:600;margin-bottom:24px}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;line-height:1.15;margin-bottom:16px;letter-spacing:-.02em}
.hero h1 span{color:var(--accent)}
.hero .lead{font-size:1.15rem;color:var(--text-2);max-width:640px;margin:0 auto 36px}
.hero-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn-main{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;padding:14px 28px;border-radius:var(--radius-sm);font-weight:600;font-size:.95rem;transition:all .2s}
.btn-main:hover{background:var(--accent-hover);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-lg)}
.btn-outline{display:inline-flex;align-items:center;gap:8px;border:1.5px solid var(--card-border);color:var(--text);padding:14px 28px;border-radius:var(--radius-sm);font-weight:600;font-size:.95rem;transition:all .2s}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}

/* Stats */
.stats{display:flex;justify-content:center;gap:48px;padding:40px 0;flex-wrap:wrap}
.stat{text-align:center}
.stat-val{font-size:1.8rem;font-weight:800;color:var(--text)}
.stat-label{font-size:.85rem;color:var(--text-3);margin-top:2px}

/* Section */
.section{padding:72px 0}
.section.alt{background:var(--bg-2)}
.section h2{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:700;text-align:center;margin-bottom:12px;letter-spacing:-.01em}
.section .sub{text-align:center;color:var(--text-2);max-width:600px;margin:0 auto 40px;font-size:1rem}

/* Download Grid */
.dl-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}
.dl-card{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:28px 24px;text-align:center;transition:all .25s}
.dl-card:hover{border-color:var(--accent);box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.dl-icon{margin-bottom:16px}
.dl-card h3{font-size:1.05rem;font-weight:600;margin-bottom:6px}
.dl-card p{font-size:.85rem;color:var(--text-3);margin-bottom:16px}
.dl-btn{display:inline-block;background:var(--accent);color:#fff;padding:10px 20px;border-radius:var(--radius-sm);font-weight:600;font-size:.85rem;transition:all .2s;width:100%}
.dl-btn:hover{background:var(--accent-hover);color:#fff}
.dl-btn.outline{background:transparent;border:1.5px solid var(--card-border);color:var(--text);margin-top:8px}
.dl-btn.outline:hover{border-color:var(--accent);color:var(--accent)}
.dl-notice{font-size:.78rem;color:var(--text-3);margin-top:10px}
.dl-buttons{display:flex;flex-direction:column;gap:0}

/* Features */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.feat{display:flex;gap:16px;background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:24px;transition:all .25s}
.feat:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.feat-icon{width:44px;height:44px;min-width:44px;background:var(--accent-soft);border-radius:12px;display:flex;align-items:center;justify-content:center}
.feat h3{font-size:.95rem;font-weight:600;margin-bottom:4px}
.feat p{font-size:.85rem;color:var(--text-2);line-height:1.5}
.ic{width:22px;height:22px;stroke:var(--accent);stroke-width:1.8;fill:none;stroke-linecap:round;stroke-linejoin:round}

/* Provider */
.provider-card{max-width:680px;margin:0 auto;background:var(--card);border:1.5px solid var(--card-border);border-radius:var(--radius);padding:36px;text-align:center}
.prov-badge{display:inline-block;background:var(--green-soft);color:var(--green);padding:4px 14px;border-radius:50px;font-size:.8rem;font-weight:600;margin-bottom:12px}
.provider-card h3{font-size:1.5rem;font-weight:700;margin-bottom:8px}
.provider-card>p{color:var(--text-2);margin-bottom:24px;font-size:.95rem}
.prov-pricing{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:24px}
.pp{background:var(--bg-2);border:1px solid var(--card-border);border-radius:var(--radius-sm);padding:14px 18px;min-width:110px}
.pp strong{display:block;font-size:1.2rem;color:var(--text)}
.pp span{font-size:.78rem;color:var(--text-3)}
.pp.pop{border-color:var(--accent);background:var(--accent-soft)}
.prov-features{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:24px}
.prov-features span{background:var(--bg-2);border:1px solid var(--card-border);padding:6px 14px;border-radius:50px;font-size:.8rem;color:var(--text-2);font-weight:500}
.btn-main.wide{width:100%;max-width:400px;justify-content:center}

/* Steps */
.steps{max-width:600px;margin:0 auto}
.step{display:flex;gap:16px;margin-bottom:20px;align-items:flex-start}
.sn{width:36px;height:36px;min-width:36px;background:var(--accent-soft);color:var(--accent);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem}
.step h3{font-size:.95rem;font-weight:600;margin-bottom:2px}
.step p{font-size:.9rem;color:var(--text-2)}

/* FAQ */
.faq-list{max-width:700px;margin:0 auto}
details{border:1px solid var(--card-border);border-radius:var(--radius-sm);margin-bottom:8px;background:var(--card);transition:all .2s}
details:hover{border-color:var(--accent)}
details[open]{border-color:var(--accent)}
summary{padding:16px 20px;cursor:pointer;font-weight:600;font-size:.95rem;list-style:none;display:flex;align-items:center;justify-content:space-between}
summary::after{content:'+';font-size:1.3rem;color:var(--text-3);transition:transform .2s}
details[open] summary::after{content:'-'}
.faq-a{padding:0 20px 16px;color:var(--text-2);font-size:.9rem;line-height:1.6}

/* CTA */
.cta-band{background:var(--accent-soft)}
.cta-band h2{color:var(--text)}
.cta-band .lead{color:var(--text-2);max-width:500px;margin:0 auto 28px;font-size:1rem;text-align:center}

/* SEO pills */
.seo-section{padding:40px 24px;text-align:center;background:var(--bg-2);border-top:1px solid var(--card-border)}
.seo-label{font-size:.75rem;font-weight:600;color:var(--text-3);letter-spacing:.08em;margin-bottom:14px}
.seo-pills{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;max-width:900px;margin:0 auto}
.seo-pills a{background:var(--card);border:1px solid var(--card-border);color:var(--text-2);padding:7px 16px;border-radius:50px;font-size:.8rem;font-weight:500;transition:all .2s}
.seo-pills a:hover{border-color:var(--accent);color:var(--accent)}

/* Footer */
footer{padding:24px;text-align:center;color:var(--text-3);font-size:.82rem;border-top:1px solid var(--card-border);background:var(--bg)}
footer a{color:var(--accent)}

/* Protocol tags */
.proto-tags{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-top:20px}
.proto-tags span{background:var(--bg-3);border:1px solid var(--card-border);padding:4px 12px;border-radius:6px;font-size:.75rem;color:var(--text-3);font-weight:500;font-family:'Roboto Mono',monospace}

/* iOS guide */
.ios-steps{max-width:600px;margin:0 auto}

/* Hero cards (index page) */
.hero-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px;max-width:700px;margin:0 auto 36px}
.hero-card{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:28px 24px;text-align:left;transition:all .25s}
.hero-card:hover{border-color:var(--accent);box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.hero-card h3{font-size:1.1rem;font-weight:700;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.hero-card p{font-size:.88rem;color:var(--text-2);line-height:1.5;margin-bottom:14px}
.hero-card .btn-sm{display:inline-flex;align-items:center;gap:6px;font-size:.85rem;font-weight:600;color:var(--accent)}

/* Guide page */
.guide-block{max-width:700px;margin:0 auto 40px;background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:32px}
.guide-block h3{font-size:1.15rem;font-weight:700;margin-bottom:16px}
.guide-block p{font-size:.9rem;color:var(--text-2);line-height:1.6;margin-bottom:8px}
.guide-block ul{margin:8px 0 8px 20px;color:var(--text-2);font-size:.9rem;line-height:1.7}
.guide-block code{background:var(--bg-3);padding:2px 8px;border-radius:4px;font-size:.85rem}
.troubleshoot{max-width:700px;margin:0 auto}
.troubleshoot details{margin-bottom:10px}

/* Platform tabs */
.platform-tabs{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:32px}
.platform-tab{background:var(--card);border:1px solid var(--card-border);padding:8px 20px;border-radius:50px;font-size:.85rem;font-weight:600;color:var(--text-2);cursor:pointer;transition:all .2s}
.platform-tab:hover,.platform-tab.active{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}

@media(max-width:768px){
    .hero{padding:48px 0 36px}
    .stats{gap:28px}
    .feat-grid{grid-template-columns:1fr}
    .prov-pricing{flex-direction:column;align-items:center}
    .dl-grid{grid-template-columns:repeat(2,1fr)}
    .hero-cards{grid-template-columns:1fr}
}
@media(max-width:480px){
    .dl-grid{grid-template-columns:1fr}
    .hero-btns{flex-direction:column;align-items:center}
}