:root{--bg: #0f172a;--accent: #4f46e5;--text: #0f172a;color-scheme:light}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;color:var(--text)}.app-topnav{position:sticky;top:0;z-index:40;background:#fff;border-bottom:1px solid #e2e8f0}.app-topnav-inner{max-width:1100px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between}.app-brand{font-weight:800;font-size:14px}.app-nav-links{display:flex;gap:8px}.nav-link{border:none;background:transparent;padding:8px 14px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;color:#475569}.nav-link.active{background:#eef2ff;color:var(--accent)}.guide-page{max-width:900px;margin:0 auto;padding:40px 20px 80px}.guide-hero h1{font-size:32px;margin-bottom:8px}.guide-hero p{color:#475569;max-width:640px}.cta-button{margin-top:16px;background:var(--accent);color:#fff;border:none;padding:12px 20px;border-radius:10px;font-weight:700;cursor:pointer}.guide-section{margin-top:48px}.guide-section h2{font-size:20px;margin-bottom:12px}.video-wrapper{position:relative;padding-top:56.25%;background:#000;border-radius:12px;overflow:hidden}.video-wrapper iframe{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;border:0}.steps-list,.limits-list{padding-left:20px;line-height:1.7;color:#334155}.pillar-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}.pillar-card{background:#f8fafc;border:1px solid #e2e8f0;border-radius:10px;padding:14px}.pillar-card h3{font-size:13px;margin:0 0 6px}.pillar-card p{font-size:12px;color:#64748b;margin:0}