:root {
  --primary-color: #007cba;
  --secondary-color: #f8f9fa;
  --border-color: #dee2e6;
  --text-color: #212529;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --input-bg: #ffffff;
  --button-hover: #0056b3;
}

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

body {
    font-family: 'Open Sans', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--input-bg);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    padding: 40px;
    border: 1px solid var(--border-color);
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    color: var(--primary-color);
    font-size: 2.2em;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    color: #6c757d;
    font-size: 1.1em;
    margin-bottom: 15px;
    line-height: 1.6;
}

.warning-box {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    border: 1px solid var(--warning-color);
    border-radius: 8px;
    padding: 15px;
    margin-top: 15px;
    color: #856404;
    font-size: 0.95em;
    line-height: 1.5;
    border-left: 4px solid var(--warning-color);
}

.warning-box strong {
    color: #856404;
    display: block;
    margin-bottom: 5px;
}

.calculator-wrapper {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.symptoms-section {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.symptoms-section h2 {
    font-size: 1.3em;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

.symptom-category {
    background: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 10px;
}

.symptom-category h3 {
    margin-bottom: 0;
    font-size: 1.1em;
    padding-bottom: 0;
    border-bottom: none;
    font-weight: normal;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-color);
    cursor: pointer;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 12px;
    user-select: none;
    transition: all 0.2s ease;
    font-weight: 600;
}

.category-header:hover {
    color: var(--primary-color);
}

.category-title {
    flex: 1;
}

.toggle-icon {
    font-size: 0.8em;
    transition: transform 0.3s ease;
    color: #6c757d;
}

.symptom-category.expanded .toggle-icon {
    transform: rotate(180deg);
}

.symptoms-list {
    max-height: 500px;
    overflow-y: auto;
    transition: max-height 0.3s ease, opacity 0.3s ease, margin 0.3s ease, padding 0.3s ease;
    opacity: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.symptoms-list.collapsed {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin: 0;
    padding: 0;
    gap: 0;
}

.symptom-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    margin-bottom: 3px;
}

.symptom-item:hover {
    background: #f0f0f0;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 124, 186, 0.1);
}

.symptom-item input[type="checkbox"] {
    margin-right: 10px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.symptom-item label {
    cursor: pointer;
    flex: 1;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    pointer-events: none;
}

.symptom-item.selected {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border-color: var(--primary-color);
    border-width: 2px;
    font-weight: 600;
}

.symptom-item.selected:hover {
    background: linear-gradient(135deg, #bbdefb 0%, #90caf9 100%);
}

.selected-symptoms-section {
    background: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
}

.selected-symptoms-section h2 {
    font-size: 1.2em;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

.selected-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
    min-height: 30px;
    justify-content: center;
    align-items: center;
}

.selected-list .no-results {
    text-align: center;
    color: #6c757d;
    padding: 20px;
    font-size: 1em;
    width: 100%;
}

.clear-button-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 10px;
    width: 100%;
}

.selected-symptom-tag {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    color: var(--text-color);
    padding: 6px 12px;
    border: 1px solid var(--primary-color);
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 600;
}

.selected-symptom-tag .remove-btn {
    margin-left: 8px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1.1em;
    line-height: 1;
    padding: 0 4px;
    color: #6c757d;
}

.selected-symptom-tag .remove-btn:hover {
    color: var(--danger-color);
}

.btn-clear {
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
    background: #6c757d;
    color: white;
}

.btn-clear:hover {
    background: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 117, 125, 0.3);
}

.results-section {
    background: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    min-height: 100px;
}

.results-section h2 {
    font-size: 1.2em;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

.diseases-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.disease-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    transition: all 0.3s ease;
    margin-bottom: 10px;
}

.disease-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 124, 186, 0.1);
}

.disease-item h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.2em;
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.disease-item .description {
    color: #6c757d;
    margin-bottom: 10px;
    line-height: 1.6;
    font-size: 0.95em;
}

.disease-item .symptoms-match {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
}

.disease-item .symptoms-match strong {
    color: var(--text-color);
    font-weight: 600;
    font-size: 0.95em;
}

.disease-item .symptoms-match .matched-symptom {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--text-color);
    padding: 3px 8px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin: 3px 3px 3px 0;
    font-size: 0.85em;
}

.disease-item .treatment {
    margin-top: 12px;
    padding: 15px;
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--success-color);
    border-radius: 8px;
}

.disease-item .treatment strong {
    color: var(--text-color);
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 0.95em;
}

.disease-item .catalog-link {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.disease-item .catalog-link a {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9em;
    font-weight: 600;
    transition: color 0.2s ease;
}

.disease-item .catalog-link a:hover {
    color: var(--button-hover);
    text-decoration: underline;
}

.no-results {
    text-align: center;
    color: #6c757d;
    padding: 30px;
    font-size: 1em;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 20px;
        margin: 10px;
    }

    header h1 {
        font-size: 1.8em;
    }

    .symptoms-section {
        gap: 12px;
    }
}