*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#060c14;--card:#0d1825;--border:#1a2a3a;--green:#00ff88;--blue:#00b4ff;--yellow:#FFD700;--purple:#a78bfa;--red:#ff4466;--text:#e8e8e8;--muted:#666}
body{background:var(--bg);color:var(--text);font-family:'Space Grotesk',sans-serif;line-height:1.6}
nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:14px 32px;display:flex;justify-content:space-between;align-items:center;background:rgba(6,12,20,0.97);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.nav-logo{font-family:'Space Mono',monospace;font-size:14px;color:var(--green);text-decoration:none}
.nav-logo span{color:var(--text)}
.nav-back{font-size:13px;color:var(--muted);text-decoration:none}.nav-back:hover{color:var(--green)}
.nav-cta{background:var(--green);color:#060c14;padding:7px 16px;border-radius:6px;font-weight:700;font-size:12px;text-decoration:none}
.layout{display:grid;grid-template-columns:240px 1fr;min-height:100vh;padding-top:52px}
@media(max-width:768px){.layout{grid-template-columns:1fr}.sidebar{display:none}}
.sidebar{position:sticky;top:52px;height:calc(100vh - 52px);overflow-y:auto;border-right:1px solid var(--border);padding:32px 20px;background:var(--card)}
.sidebar-title{font-size:10px;font-weight:700;letter-spacing:2px;color:var(--muted);text-transform:uppercase;margin-bottom:16px}
.sidebar-nav a{display:flex;align-items:center;gap:8px;padding:8px 12px;border-radius:6px;text-decoration:none;font-size:13px;color:var(--muted);transition:all .2s;margin-bottom:2px}
.sidebar-nav a:hover{background:rgba(0,255,136,.05);color:var(--text)}
.sidebar-nav a.active{background:rgba(0,255,136,.1);color:var(--green);border-left:2px solid var(--green)}
.sidebar-nav a .num{font-family:'Space Mono',monospace;font-size:10px;background:var(--border);border-radius:3px;padding:1px 5px;flex-shrink:0}
.sidebar-divider{height:1px;background:var(--border);margin:16px 0}
.sidebar-product{background:rgba(255,215,0,.05);border:1px solid rgba(255,215,0,.2);border-radius:8px;padding:14px;margin-top:16px}
.sidebar-product p{font-size:11px;color:var(--muted);margin-bottom:8px}
.sidebar-product a{display:block;background:var(--yellow);color:#060c14;text-align:center;padding:8px;border-radius:5px;font-size:11px;font-weight:700;text-decoration:none;letter-spacing:1px}
.content{padding:48px 56px;max-width:780px}
@media(max-width:768px){.content{padding:24px 20px}}
.guide-header{margin-bottom:48px}
.guide-breadcrumb{font-size:12px;color:var(--muted);margin-bottom:12px}
.guide-breadcrumb a{color:var(--muted);text-decoration:none}.guide-breadcrumb a:hover{color:var(--green)}
.guide-tag{display:inline-block;background:rgba(0,255,136,.1);border:1px solid rgba(0,255,136,.2);color:var(--green);font-size:10px;font-weight:700;letter-spacing:2px;padding:4px 10px;border-radius:4px;text-transform:uppercase;margin-bottom:12px}
.guide-header h1{font-size:clamp(26px,4vw,40px);font-weight:800;line-height:1.1;margin-bottom:12px}
.guide-header .lead{font-size:16px;color:var(--muted);line-height:1.7;margin-bottom:20px}
.guide-meta{display:flex;gap:20px;font-size:12px;color:var(--muted);flex-wrap:wrap}
.progress-bar{background:var(--border);height:3px;border-radius:2px;margin-bottom:48px}
.progress-fill{background:var(--green);height:100%;border-radius:2px;transition:width .5s}
.chapter{margin-bottom:64px;padding-bottom:64px;border-bottom:1px solid var(--border)}
.chapter:last-child{border:none}
.chapter-num{font-size:10px;font-weight:700;letter-spacing:3px;color:var(--green);text-transform:uppercase;margin-bottom:8px;font-family:'Space Mono',monospace}
.chapter h2{font-size:26px;font-weight:800;margin-bottom:16px}
.chapter p{color:var(--muted);line-height:1.8;margin-bottom:16px;font-size:15px}
.chapter h3{font-size:17px;font-weight:700;margin:28px 0 10px;color:var(--text)}
pre{background:#080f18;border:1px solid var(--border);border-radius:8px;padding:20px;overflow-x:auto;margin:20px 0;position:relative}
code{font-family:'Space Mono',monospace;font-size:13px;color:var(--green);line-height:1.7}
.inline-code{background:#080f18;border:1px solid var(--border);border-radius:4px;padding:2px 6px;font-family:'Space Mono',monospace;font-size:12px;color:var(--blue)}
.copy-btn{position:absolute;top:12px;right:12px;background:var(--border);border:none;color:var(--muted);font-size:10px;padding:4px 10px;border-radius:4px;cursor:pointer;font-family:'Space Grotesk',sans-serif}
.copy-btn:hover{color:var(--green)}
.callout{border-radius:8px;padding:16px 20px;margin:20px 0;font-size:14px;line-height:1.6}
.callout-tip{background:rgba(0,255,136,.05);border-left:3px solid var(--green)}.callout-tip strong{color:var(--green)}
.callout-warn{background:rgba(255,215,0,.05);border-left:3px solid var(--yellow)}.callout-warn strong{color:var(--yellow)}
.callout-info{background:rgba(0,180,255,.05);border-left:3px solid var(--blue)}.callout-info strong{color:var(--blue)}
.steps{list-style:none;margin:20px 0}
.step{display:flex;gap:16px;margin-bottom:20px;align-items:flex-start}
.step-circle{width:32px;height:32px;border-radius:50%;background:rgba(0,255,136,.1);border:1px solid rgba(0,255,136,.3);display:flex;align-items:center;justify-content:center;font-family:'Space Mono',monospace;font-size:13px;font-weight:700;color:var(--green);flex-shrink:0;margin-top:2px}
.step-body h4{font-size:15px;font-weight:700;margin-bottom:4px}
.step-body p{font-size:13px;color:var(--muted);line-height:1.6}
.checklist{list-style:none;margin:16px 0}
.checklist li{display:flex;gap:10px;align-items:flex-start;padding:8px 0;border-bottom:1px solid rgba(26,42,58,.5);font-size:14px;color:var(--muted)}
.checklist li::before{content:"☐";color:var(--green);font-size:16px;flex-shrink:0;line-height:1.3}
.math-block{background:#080f18;border:1px solid var(--border);border-radius:8px;padding:24px;margin:20px 0;font-family:'Space Mono',monospace}
.math-row{display:flex;justify-content:space-between;padding:8px 0;font-size:13px;border-bottom:1px solid rgba(26,42,58,.5)}
.math-row.divider{border-top:1px solid var(--green);border-bottom:none;margin-top:4px;padding-top:12px;font-weight:700}
.math-row .label{color:var(--muted)}.math-row .val{font-weight:700;color:var(--text)}
.math-row .val.green{color:var(--green)}.math-row .val.red{color:var(--red)}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:24px 0}
@media(max-width:600px){.compare-grid{grid-template-columns:1fr}}
.compare-card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:20px}
.compare-card.bad{border-color:rgba(255,68,102,.3)}.compare-card.good{border-color:rgba(0,255,136,.3)}
.compare-label{font-size:11px;font-weight:700;letter-spacing:2px;color:var(--muted);text-transform:uppercase;margin-bottom:8px}
.compare-stat{font-family:'Space Mono',monospace;font-size:28px;font-weight:700;margin-bottom:8px}
.compare-stat.green{color:var(--green)}.compare-stat.red{color:var(--red)}
.compare-detail{font-size:12px;color:var(--muted);line-height:1.6;margin-bottom:12px}
.compare-clv{font-size:13px;font-weight:600;margin-bottom:8px}
.compare-verdict{font-size:12px;font-weight:700;padding:6px 10px;border-radius:4px}
.compare-verdict.green{background:rgba(0,255,136,.1);color:var(--green)}
.compare-verdict.red{background:rgba(255,68,102,.1);color:var(--red)}
.chapter-nav{display:flex;justify-content:space-between;margin-top:48px;flex-wrap:wrap;gap:16px}
.chapter-nav a{border:1px solid var(--border);border-radius:8px;padding:16px 20px;text-decoration:none;color:var(--text);transition:border-color .2s;max-width:45%}
.chapter-nav a:hover{border-color:var(--green)}
.chapter-nav .label{font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;margin-bottom:4px}
.chapter-nav .title{font-size:14px;font-weight:600}
.chapter-nav .next{text-align:right;margin-left:auto}
.inline-upsell{background:linear-gradient(135deg,var(--card),#0a0f1a);border:1px solid var(--yellow);border-radius:10px;padding:24px;margin:32px 0;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.inline-upsell p{font-size:14px;color:var(--muted);margin:4px 0}
.inline-upsell strong{color:var(--text);display:block;font-size:16px;margin-bottom:4px}
.inline-upsell a{background:var(--yellow);color:#060c14;padding:10px 20px;border-radius:6px;font-weight:700;font-size:12px;text-decoration:none;white-space:nowrap}
.green{color:var(--green)}.red{color:var(--red)}.yellow{color:var(--yellow)}.blue{color:var(--blue)}