:root{--navy:#0b1f3a;--blue:#2a78d6;--light:#f4f7fb;--text:#18181b;--muted:#5b6475}
*{box-sizing:border-box}body{margin:0;font-family:"Product Sans","Google Sans","Segoe UI",Roboto,Arial,sans-serif;color:var(--text)}
.wrap{max-width:1100px;margin:auto;padding:0 20px}section{padding:70px 0}.alt{background:var(--light)}
.nav{position:sticky;top:0;background:var(--navy);z-index:9}.nav .wrap{display:flex;justify-content:space-between;align-items:center;height:64px}
.logo{color:#fff;font-weight:700;font-size:22px;text-decoration:none}.logo span{color:#6fb1ff}
nav a{color:#cfe0f7;margin-left:20px;text-decoration:none}nav a:hover{color:#fff}
.hero{background:linear-gradient(135deg,#0b1f3a,#1d4f91);color:#fff;padding:110px 0}.hero h1{font-size:52px;margin:0 0 16px}.hero p{font-size:20px;max-width:640px;color:#d8e6f8}
.btns{margin:28px 0}.btn{display:inline-block;background:var(--blue);color:#fff;border:0;padding:13px 26px;border-radius:8px;font:inherit;font-weight:600;cursor:pointer;text-decoration:none;margin-right:10px}
.btn:disabled{opacity:.6;cursor:wait}.ghost{background:transparent;border:2px solid #fff}
.stats{display:flex;gap:40px;flex-wrap:wrap;margin-top:40px;color:#b7cbe6}.stats b{display:block;font-size:26px;color:#fff}
h2{font-size:34px;margin:0 0 12px}.muted{color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;margin-top:24px}
.card{background:#fff;border:1px solid #e3e8ef;border-radius:12px;padding:24px}.card h3{margin-top:0;color:var(--navy)}
.best{border:2px solid var(--blue);box-shadow:0 6px 24px rgba(42,120,214,.25)}.price{font-size:34px;font-weight:700;color:var(--navy)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:40px}label{display:flex;justify-content:space-between;margin-top:18px;font-weight:600}input[type=range]{width:100%}
#recommend{margin-top:24px}.result{background:#fff;border-radius:12px;padding:28px;border:1px solid #e3e8ef;min-height:260px}
.bar{height:10px;background:#e3e8ef;border-radius:5px;margin:4px 0 12px}.bar i{display:block;height:100%;background:var(--blue);border-radius:5px}
textarea,input,select{width:100%;padding:12px;border:1px solid #cdd5e0;border-radius:8px;font:inherit;margin:8px 0}
canvas{width:100%;margin-top:20px;background:var(--light);border-radius:12px}form{max-width:560px}footer{background:var(--navy);color:#b7cbe6;padding:28px 0}
@media(max-width:760px){.two{grid-template-columns:1fr}nav{display:none}.hero h1{font-size:36px}}