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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f4f6f9;
  color: #333;
  min-height: 100vh;
  padding: 16px;
}

.container {
  max-width: 600px;
  margin: 0 auto;
}

h1 {
  font-size: 1.5rem;
  font-weight: bold;
  text-align: center;
  margin-bottom: 4px;
  color: #1a1a2e;
}

.subtitle {
  font-size: 0.8rem;
  text-align: center;
  color: #666;
  margin-bottom: 20px;
}

.card {
  background: #fff;
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 14px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

h2 {
  font-size: 1rem;
  font-weight: bold;
  margin-bottom: 12px;
  color: #1a1a2e;
  border-bottom: 2px solid #e8ecf0;
  padding-bottom: 8px;
}

h3 {
  font-size: 0.9rem;
  font-weight: bold;
  color: #555;
  margin-bottom: 10px;
}

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: #555;
  margin-bottom: 4px;
}

.form-group input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d0d5dd;
  border-radius: 6px;
  font-size: 1rem;
  transition: border-color 0.2s;
  -webkit-appearance: none;
}

.form-group input:focus {
  outline: none;
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

.button-row {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}

.btn-primary {
  flex: 1;
  padding: 14px;
  background: #3b82f6;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: #2563eb;
}

.btn-secondary {
  padding: 14px 20px;
  background: #e5e7eb;
  color: #444;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-secondary:hover {
  background: #d1d5db;
}

.result-card {
  border-left: 4px solid #3b82f6;
}

.result-block {
  margin-bottom: 16px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid #f0f0f0;
  font-size: 0.9rem;
}

.result-row:last-child {
  border-bottom: none;
}

.value {
  font-weight: bold;
  color: #1a1a2e;
}

.increase {
  color: #dc2626;
}

.profit-positive {
  color: #16a34a;
}

.profit-negative {
  color: #dc2626;
}

.highlight-block {
  background: #fef9ec;
  border: 1px solid #fbbf24;
  border-radius: 8px;
  padding: 12px;
}

.highlight-block h3 {
  color: #b45309;
}

.result-row.big {
  flex-wrap: wrap;
  gap: 4px;
}

.result-row.big span:first-child {
  font-size: 0.85rem;
  color: #666;
  flex: 1 1 100%;
}

.big-value {
  font-size: 1.6rem !important;
  color: #dc2626 !important;
  flex: 1 1 100%;
}

.alert {
  margin-top: 12px;
  padding: 12px;
  border-radius: 8px;
  font-size: 0.85rem;
}

.alert-info {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1d4ed8;
}

.alert-success {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #15803d;
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.3rem;
  }

  .result-row {
    font-size: 0.85rem;
  }

  .big-value {
    font-size: 1.4rem !important;
  }
}