:root{--o:#0D9488;--w:#14B8A6;--n:#312E81;--bg:#F1F5F9}
*{box-sizing:border-box}body{margin:0;font-family:"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:#1d2433;line-height:1.55}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}a{color:var(--n)}
header{background:#fff;border-bottom:4px solid var(--o);position:sticky;top:0;z-index:5}.bar{display:flex;justify-content:space-between;align-items:center;padding:10px 20px;flex-wrap:wrap;gap:8px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:700;color:var(--n)}.logo img{height:40px}
nav a{margin-left:16px;text-decoration:none;font-weight:600}.pill{margin-left:16px;background:var(--n);color:#fff;border-radius:20px;padding:3px 12px;font-size:13px}
.hero{background:linear-gradient(135deg,var(--n),#4338CA);color:#fff;padding:56px 0}.hero.small{padding:32px 0}.hero h1{margin:.2em 0;font-size:clamp(28px,5vw,46px)}
.kicker{color:var(--o);text-transform:uppercase;letter-spacing:.1em;font-weight:700;margin:0}.lead{font-size:18px;max-width:720px;opacity:.92}
.progress{height:10px;background:rgba(255,255,255,.2);border-radius:6px;max-width:480px;margin-top:18px}#bar{height:100%;background:var(--o);border-radius:6px;width:0}
.btn{display:inline-block;background:var(--o);color:#fff;border:0;border-radius:8px;padding:11px 20px;font-weight:700;text-decoration:none;cursor:pointer;font-size:15px}.btn.ghost{background:transparent;border:2px solid #fff}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.card{display:flex;flex-direction:column;background:#fff;border-radius:12px;overflow:hidden;text-decoration:none;color:inherit;box-shadow:0 2px 10px rgba(49,46,129,.08);border-top:4px solid var(--w);transition:transform .15s}.card:hover{transform:translateY(-3px)}
.card img{width:100%;aspect-ratio:16/9;object-fit:cover}.card div{padding:14px 16px}.card h3{margin:.2em 0;color:var(--n)}.num{color:var(--o);font-weight:700;font-size:13px;text-transform:uppercase}
.card.done{border-top-color:#2e8b57}.status{font-size:13px;font-weight:700;color:#2e8b57}.cap{margin:22px 0 40px;border-top-color:var(--o)}
.mod video{width:100%;border-radius:12px;margin-top:24px;background:#000}details{background:#fff;border-radius:8px;padding:10px 14px;margin:10px 0}
h2{color:var(--n);margin-top:1.6em}.steps li{background:#fff;margin:8px 0;padding:10px 14px;border-left:4px solid var(--o);border-radius:6px}
.diagram{background:#fff;border-radius:12px;padding:12px}.diagram svg{width:100%;height:auto;font-family:inherit}
.verify{background:#F0FDFA;border:1px solid var(--w);border-left:6px solid var(--o);border-radius:8px;padding:12px 16px;margin-top:20px}
.tag{font-size:12px;background:var(--w);color:#fff;border-radius:12px;padding:2px 10px;vertical-align:middle}
.q{background:#fff;border:1px solid #e3e0da;border-radius:10px;margin:12px 0;padding:12px 16px}.q legend{font-weight:700;padding:0 4px}.q label{display:block;padding:5px 0;cursor:pointer}
.q.ok{border-color:#2e8b57;background:#f0faf4}.q.bad{border-color:#c0392b;background:#fdf1f0}.why{font-style:italic;margin:6px 0 0}.result{font-weight:700}
.nav{display:flex;justify-content:space-between;align-items:center;margin:30px 0 50px}
textarea{width:100%;border-radius:8px;border:1px solid #ccc;padding:10px;font:inherit}
footer{background:var(--n);color:#cfd6e4;padding:24px 0;font-size:14px}footer a{color:var(--o)}

.sample-intro{color:#445;max-width:720px}
.sample-doc{position:relative;background:#fff;border:1px solid #e3e0da;border-radius:12px;padding:18px 18px 8px;margin:18px 0 28px;box-shadow:0 2px 10px rgba(49,46,129,.06)}
.sample-badge{position:absolute;top:12px;right:12px;background:#0D9488;color:#fff;font-weight:800;font-size:12px;letter-spacing:.08em;padding:4px 10px;border-radius:6px}
.sample-h{margin:0 40px 8px 0}.sample-h h3{margin:.2em 0;color:#312E81}
.sample-body{white-space:pre-wrap;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;line-height:1.45;background:#f7f8fb;border:1px dashed #c9d1df;border-radius:8px;padding:14px;overflow:auto;color:#1d2433}
.callout{border-radius:8px;padding:10px 14px;margin:12px 0;border-left:6px solid #312E81;background:#EEF2FF}
.callout p{margin:6px 0 0}
.callout.tip{border-left-color:#312E81;background:#EEF2FF}
.callout.warn{border-left-color:#0D9488;background:#F0FDFA}
.callout.defect{border-left-color:#c0392b;background:#fdf1f0}