body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  color: #333;

  /* Background image */
  background-image: url('p2.jpg');   /* replace with your jpg name */
  background-size: cover;            /* covers full screen */
  background-position: center;       /* center the image */
  background-attachment: fixed;      /* parallax effect */
}

/* keep container visible on top of background */
.container {
  max-width: 740px;
  margin: 36px auto;
  padding: 20px;
  background: rgba(255,255,255,0.92); /* slightly transparent white */
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(0,0,0,.15);
}

h1 { 
  text-align: center; 
  margin-top: 0; 
}

.howto {
  background: #f8fbfe;
  border: 1px solid #e3eef6;
  padding: 10px 14px;
  border-radius: 8px;
  margin-bottom: 16px;
}

.timeframe-toggle {
  display: flex;
  gap: 14px;
  margin: 8px 0 16px;
}

.form-group { margin-bottom: 14px; }

label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

input[type="number"] {
  width: 100%;
  box-sizing: border-box;
  padding: 10px;
  border: 1px solid #cfd8e3;
  border-radius: 8px;
}

small.hint { 
  display: block; 
  color: #666; 
  margin-top: 4px; 
}

.buttons {
  display: flex;
  gap: 10px;
  margin-top: 10px;
  flex-wrap: wrap;
}

button {
  flex: 1 1 160px;
  padding: 10px;
  border: none;
  border-radius: 8px;
  background: #4CAF50;
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}

button:hover { filter: brightness(0.95); }
button.secondary { background: #7a8899; }

#result {
  margin-top: 18px;
  font-size: 16px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 14px;
}

#result.warning {
  background: #ffefef;
  border-color: #ffb3b3;
  color: #611a1a;
}

.ai-advice {
  margin-top: 12px;
  padding: 12px;
  background: #fff9e8;
  border: 1px solid #ffe1a6;
  border-radius: 8px;
}

.breakdown {
  margin-top: 10px;
  border-top: 1px dashed #cfd8e3;
  padding-top: 10px;
}

.breakdown ul { margin: 8px 0 0 18px; }

.history { margin-top: 20px; }
.history ul { margin: 8px 0 12px 18px; }