:root {
  --primary: #4361ee;
  --primary-light: #e0e5ff;
  --secondary: #3f37c9;
  --light: #f8f9fa;
  --dark: #212529;
  --gray: #6c757d;
  --gray-light: #e9ecef;
  --success: #4bb543;
  --warning: #ffc107;
  --danger: #dc3545;
  --border-radius: 12px;
  --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --transition: all 0.3s ease;
}

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

body {
  font-family: "Times New Roman", Times, serif;
  line-height: 1.6;
  color: var(--dark);
  background-color: #f5f7ff;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem;
}

.container {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 2.5rem;
}

h1 {
  font-size: 2.4rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.subtitle {
  color: var(--gray);
  font-size: 1.1rem;
}

main {
  background-color: white;
  padding: 2.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 0;
}

label {
  display: block;
  margin-bottom: 0.75rem;
  font-weight: 600;
  color: var(--dark);
  font-size: 0.95rem;
}

.form-control {
  width: 100%;
  padding: 0.9rem 1.2rem;
  font-size: 1rem;
  border: 1px solid var(--gray-light);
  border-radius: var(--border-radius);
  transition: var(--transition);
  background-color: white;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1rem;
  font-family: "Times New Roman", Times, serif;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.result-container {
  margin-top: 1.5rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.result-placeholder {
  text-align: center;
  color: var(--gray);
  padding: 2rem;
}

.placeholder-icon {
  width: 80px;
  height: 80px;
  opacity: 0.7;
  margin-bottom: 1rem;
}

.solution-card {
  background-color: white;
  border-radius: var(--border-radius);
  padding: 1rem;
  margin-bottom: 1.5rem;
  border-left: 4px solid var(--primary);
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
}

.solution-card h3 {
  color: var(--primary);
  margin-bottom: 1rem;
  font-size: 1.3rem;
}
.solution-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.solution-card .solution-meta {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}
.solution-notes {
  font-style: italic;
  color: var(--gray);
  margin-top: -0.8rem;
}

.solution-meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  margin: 0;
  line-height: 1.4;
}

.solution-meta-item strong {
  font-weight: 600;
  color: var(--dark);
}

.solution-card p {
  line-height: 1.7;
  color: var(--dark);
}

.warning-note {
  color: var(--warning);
  font-weight: 500;
  margin-top: 0.2rem;
}

.solution-card.warning {
  border-left-color: var(--warning);
}

.solution-card.warning h3 {
  color: var(--warning);
}

.solution-card.success {
  border-left-color: var(--success);
}

.solution-card.success h3 {
  color: var(--success);
}

@media (max-width: 768px) {
  .container {
    padding: 0;
  }

  h1 {
    font-size: 2rem;
  }
  .solution-card {
    min-height: auto;
    padding: 1.4rem;
  }

  .solution-container {
    gap: 1rem;
  }
  main {
    padding: 1.8rem;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }
}