:root{--bg:#0a0e1a;--surface:#111827;--surface2:#1a2235;--border:#1e2d45;--accent:#00d4aa;--accent2:#ff6b35;--accent3:#7c3aed;--accent4:#fbbf24;--text:#e2e8f0;--muted:#64748b;--heading:#f8fafc;--code-bg:#0d1117;--sidebar-w:280px}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Lora',Georgia,serif;background:var(--bg);color:var(--text);line-height:1.75;overflow-x:hidden}
#sidebar{position:fixed;left:0;top:0;width:var(--sidebar-w);height:100vh;background:var(--surface);border-right:1px solid var(--border);overflow-y:auto;z-index:100;display:flex;flex-direction:column;transition:transform .3s ease}
#sidebar::-webkit-scrollbar{width:4px}
#sidebar::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}
.sidebar-logo{padding:24px 20px 20px;border-bottom:1px solid var(--border);flex-shrink:0}
.sidebar-logo h1{font-family:'Syne',sans-serif;font-size:1.1rem;font-weight:800;color:var(--accent);letter-spacing:-.02em;line-height:1.2}
.sidebar-logo p{font-family:'DM Mono',monospace;font-size:.65rem;color:var(--muted);margin-top:4px}
.sidebar-nav{padding:16px 0;flex:1}
.nav-section-label{font-family:'DM Mono',monospace;font-size:.6rem;color:var(--muted);text-transform:uppercase;letter-spacing:.15em;padding:12px 20px 6px}
.nav-item{display:flex;align-items:center;gap:10px;padding:9px 20px;cursor:pointer;font-family:'Syne',sans-serif;font-size:.82rem;font-weight:600;color:var(--muted);border-left:2px solid transparent;transition:all .2s;text-decoration:none}
.nav-item:hover{color:var(--text);background:rgba(255,255,255,.04)}
.nav-item.active{color:var(--accent);border-left-color:var(--accent);background:rgba(0,212,170,.06)}
.nav-item .nav-icon{font-size:1rem;width:20px;text-align:center}
.nav-item .nav-num{font-family:'DM Mono',monospace;font-size:.6rem;color:var(--muted);margin-left:auto}
#main{margin-left:var(--sidebar-w);min-height:100vh}
#hero{padding:80px 60px 60px;background:linear-gradient(135deg,#0a0e1a 0%,#0d1f3c 50%,#0a1628 100%);border-bottom:1px solid var(--border);position:relative;overflow:hidden}
#hero::before{content:'';position:absolute;top:-100px;right:-100px;width:500px;height:500px;background:radial-gradient(circle,rgba(0,212,170,.08) 0%,transparent 70%);pointer-events:none}
#hero::after{content:'';position:absolute;bottom:-50px;left:30%;width:300px;height:300px;background:radial-gradient(circle,rgba(124,58,237,.06) 0%,transparent 70%);pointer-events:none}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(0,212,170,.1);border:1px solid rgba(0,212,170,.25);border-radius:100px;padding:5px 14px;font-family:'DM Mono',monospace;font-size:.7rem;color:var(--accent);margin-bottom:28px;animation:fadeInDown .6s ease}
.hero-badge::before{content:'●';font-size:.5rem;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
#hero h2{font-family:'Syne',sans-serif;font-size:clamp(2.2rem,4vw,3.6rem);font-weight:800;color:var(--heading);line-height:1.1;letter-spacing:-.03em;margin-bottom:20px;animation:fadeInUp .7s ease .1s both}
#hero h2 .hl{color:var(--accent)}
#hero h2 .hl2{color:var(--accent2)}
#hero p{font-size:1.1rem;color:var(--muted);max-width:600px;margin-bottom:36px;animation:fadeInUp .7s ease .2s both}
.hero-stats{display:flex;gap:32px;animation:fadeInUp .7s ease .3s both}
.stat{text-align:left}
.stat-num{font-family:'Syne',sans-serif;font-size:1.8rem;font-weight:800;color:var(--heading)}
.stat-label{font-family:'DM Mono',monospace;font-size:.65rem;color:var(--muted);text-transform:uppercase;letter-spacing:.1em}
@keyframes fadeInDown{from{opacity:0;transform:translateY(-16px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
#progress-bar{background:var(--surface);border-bottom:1px solid var(--border);padding:16px 60px;display:flex;align-items:center;gap:16px;position:sticky;top:0;z-index:50}
.progress-label{font-family:'DM Mono',monospace;font-size:.7rem;color:var(--muted);white-space:nowrap}
.progress-track{flex:1;height:3px;background:var(--border);border-radius:2px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent3));border-radius:2px;width:0%;transition:width .5s ease}
.progress-pct{font-family:'DM Mono',monospace;font-size:.7rem;color:var(--accent)}
.module{display:none;padding:60px;max-width:900px;animation:fadeInUp .4s ease}
.module.visible{display:block}
.module-header{display:flex;align-items:flex-start;gap:20px;margin-bottom:40px}
.module-icon{font-size:3rem;line-height:1;filter:drop-shadow(0 0 20px rgba(0,212,170,.3))}
.module-tag{font-family:'DM Mono',monospace;font-size:.65rem;color:var(--accent);text-transform:uppercase;letter-spacing:.15em;margin-bottom:6px}
.module-title{font-family:'Syne',sans-serif;font-size:clamp(1.8rem,3vw,2.8rem);font-weight:800;color:var(--heading);line-height:1.1;letter-spacing:-.02em}
.section{margin-bottom:48px}
.section-title{font-family:'Syne',sans-serif;font-size:1.25rem;font-weight:700;color:var(--heading);margin-bottom:16px;display:flex;align-items:center;gap:10px}
.section-title::before{content:'';display:block;width:4px;height:20px;background:var(--accent);border-radius:2px;flex-shrink:0}
p{margin-bottom:14px;color:var(--text)}
p:last-child{margin-bottom:0}
.callout{border-radius:10px;padding:20px 24px;margin:24px 0;border-left:3px solid;font-size:.95rem}
.callout-analogy{background:rgba(251,191,36,.06);border-color:var(--accent4)}
.callout-analogy .callout-label{font-family:'DM Mono',monospace;font-size:.65rem;text-transform:uppercase;letter-spacing:.1em;color:var(--accent4);margin-bottom:8px}
.callout-tip{background:rgba(0,212,170,.06);border-color:var(--accent)}
.callout-tip .callout-label{font-family:'DM Mono',monospace;font-size:.65rem;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin-bottom:8px}
.callout-warn{background:rgba(255,107,53,.06);border-color:var(--accent2)}
.callout-warn .callout-label{font-family:'DM Mono',monospace;font-size:.65rem;text-transform:uppercase;letter-spacing:.1em;color:var(--accent2);margin-bottom:8px}
.callout-project{background:rgba(124,58,237,.07);border-color:var(--accent3)}
.callout-project .callout-label{font-family:'DM Mono',monospace;font-size:.65rem;text-transform:uppercase;letter-spacing:.1em;color:var(--accent3);margin-bottom:8px}
.code-block{background:var(--code-bg);border:1px solid var(--border);border-radius:10px;overflow:hidden;margin:20px 0;font-family:'DM Mono',monospace}
.code-header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:rgba(255,255,255,.03);border-bottom:1px solid var(--border)}
.code-lang{font-size:.65rem;color:var(--accent);text-transform:uppercase;letter-spacing:.1em}
.code-dots{display:flex;gap:5px}
.code-dots span{width:8px;height:8px;border-radius:50%}
.code-dots span:nth-child(1){background:#ff5f56}
.code-dots span:nth-child(2){background:#ffbd2e}
.code-dots span:nth-child(3){background:#27c93f}
.code-body{padding:20px;font-size:.82rem;line-height:1.8;color:#a8d8a8;overflow-x:auto;white-space:pre}
.code-body .comment{color:#5c6e4e;font-style:italic}
.code-body .kw{color:#c792ea}
.code-body .str{color:#c3e88d}
.code-body .cmd{color:#82aaff}
.code-body .out{color:var(--accent)}
.steps{list-style:none;margin:20px 0}
.steps li{display:flex;gap:14px;margin-bottom:14px;align-items:flex-start}
.step-num{flex-shrink:0;width:26px;height:26px;background:var(--accent);color:#000;font-family:'Syne',sans-serif;font-size:.75rem;font-weight:800;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-top:2px}
.compare-table{width:100%;border-collapse:collapse;margin:20px 0;font-size:.9rem}
.compare-table th{font-family:'Syne',sans-serif;font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;padding:12px 16px;background:var(--surface2);color:var(--muted);text-align:left;border-bottom:1px solid var(--border)}
.compare-table td{padding:12px 16px;border-bottom:1px solid rgba(255,255,255,.04);vertical-align:top}
.compare-table tr:hover td{background:rgba(255,255,255,.02)}
.badge-bad{display:inline-block;background:rgba(255,107,53,.15);color:var(--accent2);font-family:'DM Mono',monospace;font-size:.65rem;padding:2px 8px;border-radius:4px}
.badge-good{display:inline-block;background:rgba(0,212,170,.12);color:var(--accent);font-family:'DM Mono',monospace;font-size:.65rem;padding:2px 8px;border-radius:4px}
.concept-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin:20px 0}
.concept-card{background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:20px;transition:border-color .2s,transform .2s}
.concept-card:hover{border-color:var(--accent);transform:translateY(-2px)}
.concept-card .cc-icon{font-size:1.5rem;margin-bottom:10px}
.concept-card .cc-title{font-family:'Syne',sans-serif;font-size:.9rem;font-weight:700;color:var(--heading);margin-bottom:6px}
.concept-card .cc-desc{font-size:.85rem;color:var(--muted)}
.divider{height:1px;background:var(--border);margin:48px 0}
.next-card{background:var(--surface2);border:1px solid var(--border);border-radius:12px;padding:24px;margin-top:40px;display:flex;align-items:center;gap:20px;cursor:pointer;transition:all .2s}
.next-card:hover{border-color:var(--accent);background:rgba(0,212,170,.04)}
.next-card .next-text{flex:1}
.next-card .next-label{font-family:'DM Mono',monospace;font-size:.65rem;color:var(--muted);text-transform:uppercase;letter-spacing:.1em;margin-bottom:4px}
.next-card .next-title{font-family:'Syne',sans-serif;font-size:1.1rem;font-weight:700;color:var(--heading)}
.next-card .next-why{font-size:.85rem;color:var(--muted);margin-top:4px}
.next-arrow{font-size:1.5rem;color:var(--accent)}
.checklist{list-style:none;margin:16px 0}
.checklist li{display:flex;align-items:flex-start;gap:10px;margin-bottom:8px;font-size:.93rem}
.checklist li::before{content:'✓';color:var(--accent);font-weight:700;margin-top:2px;flex-shrink:0}
#menu-toggle{display:none;position:fixed;top:16px;left:16px;z-index:200;background:var(--surface);border:1px solid var(--border);color:var(--text);padding:8px 12px;border-radius:8px;cursor:pointer;font-size:1rem}
.arch-diagram{background:var(--code-bg);border:1px solid var(--border);border-radius:10px;padding:24px;font-family:'DM Mono',monospace;font-size:.78rem;color:var(--accent);margin:20px 0;overflow-x:auto;white-space:pre;line-height:1.6}
.svg-diagram{width:100%;margin:24px 0;border-radius:12px;overflow:hidden;background:var(--surface2);border:1px solid var(--border)}
.svg-diagram svg{width:100%;height:auto;display:block}
.diagram-caption{font-family:'DM Mono',monospace;font-size:.65rem;color:var(--muted);text-align:center;padding:8px;background:rgba(0,0,0,.2)}
.info-box{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}
.info-box-item{background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:18px}
.info-box-item h4{font-family:'Syne',sans-serif;font-size:.9rem;font-weight:700;color:var(--heading);margin-bottom:8px}
.info-box-item p{font-size:.85rem;color:var(--muted);margin:0}
@media(max-width:600px){.info-box{grid-template-columns:1fr}}
.flow{display:flex;align-items:center;gap:0;flex-wrap:wrap;margin:20px 0;background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:16px 20px;overflow-x:auto}
.flow-step{display:flex;align-items:center;gap:0}
.flow-box{background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:8px 14px;font-family:'DM Mono',monospace;font-size:.72rem;color:var(--text);white-space:nowrap}
.flow-box.active{border-color:var(--accent);color:var(--accent)}
.flow-arrow{font-size:1.2rem;color:var(--muted);padding:0 8px}
#landing-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin:32px 0}
.landing-card{background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:16px;cursor:pointer;transition:all .2s;text-align:left}
.landing-card:hover{border-color:var(--accent);transform:translateY(-3px);background:rgba(0,212,170,.04)}
.landing-card .lc-num{font-family:'DM Mono',monospace;font-size:.6rem;color:var(--muted);margin-bottom:8px}
.landing-card .lc-icon{font-size:1.6rem;margin-bottom:8px}
.landing-card .lc-title{font-family:'Syne',sans-serif;font-size:.85rem;font-weight:700;color:var(--heading)}
strong{color:var(--heading);font-weight:600}
em{color:var(--accent4);font-style:italic}
code{font-family:'DM Mono',monospace;font-size:.82em;background:rgba(255,255,255,.06);padding:2px 6px;border-radius:4px;color:var(--accent)}
@media(max-width:768px){#sidebar{transform:translateX(-100%)}#sidebar.open{transform:translateX(0)}#main{margin-left:0}#menu-toggle{display:block}.module{padding:60px 24px 40px}#hero{padding:80px 24px 40px}#progress-bar{padding:14px 24px}.hero-stats{flex-wrap:wrap;gap:20px}}