*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f5f6fa;
  color: #2c3e50;
  line-height: 1.6;
}

header {
  background: linear-gradient(135deg, #1a252f 0%, #2c3e50 100%);
  color: white;
  padding: 2rem 1rem;
  text-align: center;
}
header h1 { font-size: 1.8rem; margin-bottom: 0.5rem; }
header p  { opacity: 0.85; font-size: 0.95rem; max-width: 680px; margin: 0 auto; }

main { max-width: 900px; margin: 2rem auto; padding: 0 1rem; }

.card {
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  padding: 1.5rem 2rem;
  margin-bottom: 1.5rem;
}
.card h2 { font-size: 1.1rem; color: #7f8c8d; margin-bottom: 1rem; text-transform: uppercase; letter-spacing: 0.05em; }

.form-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: flex-end;
}
.form-group { display: flex; flex-direction: column; gap: 0.3rem; flex: 1; min-width: 200px; }
.form-group label { font-size: 0.9rem; font-weight: 600; color: #555; }

select, input[type="number"] {
  padding: 0.55rem 0.75rem;
  border: 1.5px solid #ddd;
  border-radius: 6px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}
select:focus, input:focus { border-color: #3498db; }

.income-wrap { position: relative; }
.income-wrap input { width: 100%; padding-right: 3.5rem; }
#currency-label {
  position: absolute; right: 0.75rem; top: 50%; transform: translateY(-50%);
  font-size: 0.85rem; color: #888; pointer-events: none;
}

button {
  padding: 0.6rem 1.8rem;
  background: #3498db;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}
button:hover { background: #2980b9; }

#error-msg {
  display: none;
  color: #e74c3c;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}
#status { color: #888; font-size: 0.9rem; margin-top: 0.5rem; min-height: 1.2em; }

#result-section { display: none; }

#result-summary {
  background: #eaf4fb;
  border-left: 4px solid #3498db;
  padding: 0.75rem 1rem;
  border-radius: 4px;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.chart-container { position: relative; height: 360px; }

.note {
  font-size: 0.8rem;
  color: #999;
  margin-top: 0.75rem;
  line-height: 1.5;
}

footer {
  text-align: center;
  padding: 1.5rem;
  color: #aaa;
  font-size: 0.8rem;
}
footer a { color: #aaa; }

@media (max-width: 600px) {
  header h1 { font-size: 1.3rem; }
  .card { padding: 1rem; }
  .form-row { flex-direction: column; }
}