:root{--ink:#172033;--muted:#637086;--accent:#1565c0;--pale:#eef5ff;--line:#dbe3ef;--dark:#111827}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);line-height:1.65;background:#fff}a{color:var(--accent)}.top{max-width:1040px;margin:auto;padding:20px 24px;display:flex;justify-content:space-between;gap:20px}.top a{text-decoration:none;font-weight:650}.hero{background:var(--dark);color:#fff;padding:64px 24px}.hero>div,.layout{max-width:960px;margin:auto}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.78rem;color:#8bbcff;font-weight:800}.hero h1{font-size:clamp(2rem,5vw,3.4rem);line-height:1.1;margin:.3rem 0 1rem}.hero p{max-width:720px;color:#d6dfef;font-size:1.15rem}.layout{padding:48px 24px 80px}.path{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:0 0 42px}.path a{border:1px solid var(--line);border-radius:12px;padding:14px;text-decoration:none;color:var(--ink);font-weight:700}.path a.current{border-color:var(--accent);background:var(--pale)}.path span{display:block;color:var(--accent);font-size:.8rem;text-transform:uppercase}.guide-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.card{border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:0 8px 24px rgba(23,32,51,.06)}.card .number{font-size:.8rem;color:var(--accent);font-weight:800;text-transform:uppercase}.card h2{margin:.3rem 0}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.button{display:inline-block;padding:10px 14px;border-radius:8px;background:var(--accent);color:#fff;text-decoration:none;font-weight:700}.button.secondary{background:#fff;color:var(--accent);border:1px solid var(--accent)}article{max-width:760px}article h2{margin-top:2.2rem;border-bottom:1px solid var(--line);padding-bottom:.35rem}article li{margin:.45rem 0}pre.song-example{background:#10141d;color:#eaf1ff;border-radius:12px;padding:18px;overflow:auto;font:0.92rem/1.55 "SFMono-Regular",Consolas,monospace}.callout{background:var(--pale);border-left:4px solid var(--accent);padding:16px 18px;border-radius:0 10px 10px 0;margin:24px 0}.next{margin-top:40px;padding:22px;border-radius:14px;background:var(--dark);color:#fff}.next a{color:#9cc8ff;font-weight:800}footer{border-top:1px solid var(--line);padding:28px;text-align:center;color:var(--muted)}@media(max-width:760px){.path,.guide-grid{grid-template-columns:1fr}.hero{padding-top:42px}.path a:not(.current){display:none}}