:root{--bg:#0f172a;--card:#1e293b;--accent:#22c55e;--text:#f8fafc;--muted:#94a3b8}
*{box-sizing:border-box}body{margin:0;background:linear-gradient(180deg,#0f172a,#111827);font-family:system-ui,sans-serif;color:var(--text)}
.app{max-width:460px;margin:auto;padding:18px}
header{text-align:center;margin-bottom:16px}header h1{margin:0;font-size:2rem}header p{color:var(--muted)}
.card{background:var(--card);border-radius:18px;padding:18px;margin-bottom:16px;box-shadow:0 8px 24px rgba(0,0,0,.25)}
label{display:block;margin:10px 0 6px;font-weight:600}input{width:100%;padding:13px;border-radius:12px;border:1px solid #334155;background:#0f172a;color:#fff}
button{margin-top:16px;width:100%;padding:15px;border:0;border-radius:14px;background:var(--accent);font-size:1rem;font-weight:700}
.result h2{margin-top:0}.partner a{display:inline-block;margin-top:10px;color:#7dd3fc;text-decoration:none}footer{text-align:center;color:var(--muted);font-size:.85rem}

#clear{margin-top:8px;width:100%;}

body{background:#0f172a;color:#f3f4f6;font-family:system-ui,sans-serif;}
.container,.card{max-width:430px;margin:auto;background:#111827;border-radius:22px;padding:18px;box-shadow:0 12px 30px rgba(0,0,0,.35)}
input{border-radius:14px;padding:14px;font-size:18px}
button{border-radius:16px;padding:15px;font-weight:700}
button.primary,#calculate{background:#22c55e;color:#fff}
.result{border:2px solid #22c55e;border-radius:18px;padding:16px;margin-top:16px}