@import url('https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@500;600;700&family=IBM+Plex+Mono:wght@400;500;600&family=Inter:wght@400;600;700&display=swap');
:root{--bg:#080b10;--panel:#10161d;--line:#29333d;--ink:#f2f3ed;--muted:#909ba4;--acid:#d7ff45;--orange:#ff7048;--cyan:#48cfff}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,sans-serif;line-height:1.65}a{color:inherit}.wrap{width:min(1120px,calc(100% - 40px));margin:auto}.mono,.eyebrow,.kicker,.tag{font-family:'IBM Plex Mono',monospace;text-transform:uppercase;letter-spacing:.12em}
header{height:70px;border-bottom:1px solid var(--line);display:flex;align-items:center;position:sticky;top:0;z-index:5;background:#080b10ed;backdrop-filter:blur(14px)}nav{display:flex;align-items:center;justify-content:space-between;gap:24px}.logo img{display:block;width:150px}.nav-links{display:flex;gap:22px;align-items:center;font-size:13px}.nav-links a{text-decoration:none;color:var(--muted)}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;background:var(--acid);border:1px solid #e8ff87;color:#0b0e08!important;text-decoration:none!important;font-weight:800;box-shadow:5px 5px 0 #34400d;transition:.18s}.button:hover{transform:translate(-2px,-2px);box-shadow:8px 8px 0 #34400d}.button.dark{background:#151c23;border-color:#34404a;color:var(--ink)!important;box-shadow:none}
.hero{padding:88px 0 68px;background:radial-gradient(circle at 80% 20%,#48cfff16,transparent 32%),radial-gradient(circle at 14% 12%,#d7ff4510,transparent 28%);border-bottom:1px solid var(--line)}.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:64px;align-items:center}.eyebrow{font-size:11px;color:var(--acid);font-weight:600}.hero h1{font:700 clamp(48px,7vw,84px)/.94 'Chakra Petch',sans-serif;letter-spacing:-.055em;margin:17px 0 23px}.hero h1 em{font-style:normal;color:var(--accent,var(--cyan))}.lead{font-size:18px;color:var(--muted);max-width:630px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin:30px 0 18px}.trust{font-size:10px;color:#6f7b84}.diagram{padding:28px 22px;border:1px solid var(--line);background:#0c1117;box-shadow:16px 16px 0 #030609}.diagram-title{display:flex;justify-content:space-between;color:#74818a;font-size:9px;margin-bottom:18px}.fret{display:grid;grid-template-columns:repeat(7,1fr);grid-template-rows:repeat(6,28px);gap:3px;padding:12px;background:linear-gradient(90deg,#15191d,#24201c);border:1px solid #3d454a}.fret i{display:grid;place-items:center;font:600 9px 'IBM Plex Mono';font-style:normal;color:#56616a;border-right:1px solid #596168}.fret i.on{border:0;border-radius:50%;background:var(--accent,var(--cyan));color:#071014;box-shadow:0 0 18px color-mix(in srgb,var(--accent,var(--cyan)) 55%,transparent)}.diagram-note{margin:17px 0 0;color:#85919a;font-size:12px}
.content{padding:88px 0}.content.alt{background:#0c1116;border-block:1px solid var(--line)}.section-head{display:grid;grid-template-columns:.88fr 1.12fr;gap:60px;margin-bottom:38px}.section-head h2{font:700 clamp(34px,5vw,56px)/1 'Chakra Petch';letter-spacing:-.04em;margin:10px 0}.section-head p{color:var(--muted);align-self:end}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.card{border:1px solid var(--line);background:var(--panel);padding:27px;min-height:235px}.card b{color:var(--accent,var(--cyan));font:600 10px 'IBM Plex Mono'}.card h3{font:600 23px/1.1 'Chakra Petch';margin:38px 0 10px}.card p{color:var(--muted);font-size:14px;margin:0}.lesson{display:grid;grid-template-columns:240px 1fr;gap:44px;padding:28px 0;border-top:1px solid var(--line)}.lesson:last-child{border-bottom:1px solid var(--line)}.lesson-no{font:700 50px 'Chakra Petch';color:#26313a}.lesson h3{font:600 24px 'Chakra Petch';margin:0 0 8px}.lesson p{color:var(--muted);margin:0}.exercise{margin-top:16px;padding:15px 18px;border-left:3px solid var(--accent,var(--cyan));background:#111820;color:#cdd3d3;font-size:13px}.note-row{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.note-row span{width:42px;height:42px;display:grid;place-items:center;border:1px solid #394550;background:#111820;font:600 12px 'IBM Plex Mono'}.note-row span.root{background:var(--acid);color:#0a0d07;border-color:var(--acid)}
.faq{max-width:840px}.faq h2{font:700 42px 'Chakra Petch';letter-spacing:-1.5px}.faq details{padding:20px 0;border-top:1px solid var(--line)}.faq details:last-child{border-bottom:1px solid var(--line)}.faq summary{cursor:pointer;font-weight:700}.faq p{color:var(--muted);margin:10px 0 0}.related{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.related a{padding:20px;border:1px solid var(--line);background:#111820;text-decoration:none;font-weight:700}.related a span{display:block;color:#74818a;font:9px 'IBM Plex Mono';margin-bottom:6px}.related a:hover{border-color:var(--acid)}.final{padding:84px 0;text-align:center;background:linear-gradient(135deg,#d7ff4512,#48cfff10)}.final h2{font:700 clamp(38px,6vw,66px)/1 'Chakra Petch';letter-spacing:-.04em;margin:10px 0 18px}.final p{color:var(--muted);margin-bottom:26px}footer{padding:28px 0;border-top:1px solid var(--line);color:#65717a;font:9px 'IBM Plex Mono'}.foot{display:flex;justify-content:space-between;gap:20px}
@media(max-width:820px){.nav-links>a:not(.button){display:none}.hero{padding-top:56px}.hero-grid,.section-head{grid-template-columns:1fr}.hero-grid{gap:44px}.section-head{gap:8px}.cards,.related{grid-template-columns:1fr}.card{min-height:0}.lesson{grid-template-columns:1fr;gap:4px}.lesson-no{font-size:32px}.diagram{box-shadow:none}.foot{flex-direction:column}.wrap{width:min(100% - 28px,1120px)}}