:root{--navy:#0b1f3a;--sky:#2f7de1;--amber:#f2a900;--ink:#1c2533;--mute:#5b6778;--bg:#f6f8fb}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:#fff;line-height:1.6}
a{color:var(--sky)}.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header{background:var(--navy);color:#fff;position:sticky;top:0;z-index:5}
header .wrap{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;padding:14px 20px}
.logo{font-weight:800;color:#fff;text-decoration:none;font-size:1.2rem;letter-spacing:.5px}.logo span{color:var(--amber)}
nav a{color:#cfe0ff;text-decoration:none;margin-left:18px;font-weight:500}nav a:hover{color:#fff}
.hero{background:linear-gradient(135deg,var(--navy),#163d6e 60%,var(--sky));color:#fff;padding:90px 0 80px}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);line-height:1.15;margin:0 0 16px}.hero p{font-size:1.15rem;max-width:640px;color:#dbe7ff}
.btn{display:inline-block;background:var(--amber);color:var(--navy);padding:12px 22px;border-radius:8px;font-weight:700;text-decoration:none;margin:8px 8px 0 0}
.btn.ghost{background:transparent;color:#fff;border:2px solid #fff}
section{padding:64px 0}section.alt{background:var(--bg)}h2{font-size:1.9rem;margin:0 0 12px;color:var(--navy)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:22px;margin-top:26px}
.card{background:#fff;border:1px solid #e3e8ef;border-radius:12px;padding:24px;box-shadow:0 2px 8px rgba(11,31,58,.05)}
.card h3{margin-top:0;color:var(--navy)}.price{font-size:1.5rem;font-weight:800;color:var(--sky)}.small{font-size:.88rem;color:var(--mute)}
.tag{display:inline-block;background:#e8f0fd;color:var(--sky);border-radius:20px;padding:2px 10px;font-size:.8rem;font-weight:600}
.disclose{background:#fff8e6;border-left:4px solid var(--amber);padding:14px 18px;border-radius:6px;font-size:.92rem}
footer{background:var(--navy);color:#9fb3d1;padding:30px 0;font-size:.88rem}footer a{color:#cfe0ff}
.lesson{border-left:4px solid var(--sky);padding-left:18px;margin:36px 0}.check li{margin:6px 0}
.quiz fieldset{border:1px solid #e3e8ef;border-radius:10px;margin:14px 0;padding:14px}.result{font-weight:700;margin-top:10px}
.toc a{display:block;padding:4px 0}
@media(max-width:640px){nav a{margin:0 12px 0 0}.hero{padding:60px 0}}