:root{
  --bg:#f7f9fc;
  --card:#ffffff;
  --accent:#0f766e;
  --muted:#6b7280;
  --danger:#ef4444;
}

*{box-sizing:border-box;font-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;}
html,body{height:100%;margin:0;background:var(--bg);color:#0f172a}
.container{max-width:980px;margin:28px auto;padding:16px;}
header{margin-bottom:12px}
h1{margin:0;font-size:1.6rem;color:var(--accent)}
.subtitle{margin:6px 0;color:var(--muted)}

.card{background:var(--card);padding:16px;border-radius:10px;box-shadow:0 6px 18px rgba(2,6,23,0.06);margin-bottom:14px}
.row{display:flex;flex-direction:column;margin-bottom:10px}
.row label{font-size:0.9rem;color:var(--muted);margin-bottom:6px}
.row input, .row select{padding:8px 10px;border-radius:6px;border:1px solid #e6edf3;font-size:1rem}

.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:6px}
button{padding:10px 14px;border-radius:8px;border:0;cursor:pointer;background:var(--accent);color:white;font-weight:600}
button[disabled]{opacity:0.5;cursor:not-allowed}
#resetBtn{background:#e6eaf2;color:#0b1220}
#downloadBtn{background:#2563eb}

.hidden{display:none}

#planGrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px;margin-top:10px}
.dayCard{border:1px solid #e9eef5;padding:10px;border-radius:8px;background:linear-gradient(180deg, rgba(255,255,255,0.9), rgba(250,250,250,0.9));}
.dayCard h4{margin:0 0 8px 0}
.dayCard p{margin:0;font-size:0.95rem;color:var(--muted)}
.small{font-size:0.85rem;color:#374151;margin-top:6px}

footer{margin-top:10px;text-align:center;color:var(--muted)}
@media (max-width:520px){
  .actions{flex-direction:column}
}