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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    margin-top: 20px;
    margin-bottom: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid #f0f0f0;
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 1.1rem;
}

/* CSV Upload Section */
.csv-upload-section {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 30px;
    border: 2px solid #e9ecef;
}

.csv-upload-section h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #495057;
}

.csv-description {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.csv-upload-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.csv-upload-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.csv-upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.csv-upload-btn:active {
    transform: translateY(0);
}

.csv-file-name {
    color: #495057;
    font-size: 0.9rem;
    font-weight: 500;
}

.csv-error {
    margin-top: 15px;
    padding: 12px 15px;
    background: #fff5f5;
    border: 2px solid #dc3545;
    border-radius: 8px;
    color: #dc3545;
    font-size: 0.9rem;
}

.csv-error.hidden {
    display: none;
}

#entriesContainer {
    margin-bottom: 30px;
}

.entry-row {
    display: flex;
    gap: 15px;
    align-items: flex-start;
    padding: 20px;
    margin-bottom: 15px;
    background: #f8f9fa;
    border-radius: 12px;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.entry-row:hover {
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.1);
}

.entry-row.entry-error {
    border-color: #dc3545;
    background: #fff5f5;
}

.entry-field {
    flex: 1;
}

.entry-field label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #495057;
    font-size: 0.9rem;
}

.entry-field select,
.entry-field input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #dee2e6;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

.entry-field select:focus,
.entry-field input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.entry-field select {
    cursor: pointer;
}

/* Custom Select Dropdown with Search */
.custom-select-wrapper {
    position: relative;
    width: 100%;
}

.custom-select {
    position: relative;
    width: 100%;
}

.custom-select-trigger {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #dee2e6;
    border-radius: 8px;
    font-size: 1rem;
    background: white;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.custom-select-trigger:hover {
    border-color: #667eea;
}

.custom-select.open .custom-select-trigger {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.custom-select-value {
    flex: 1;
    text-align: left;
    color: #333;
}

.custom-select-value:empty::before {
    content: 'Select an ArUco...';
    color: #999;
}

.custom-select-arrow {
    color: #667eea;
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.custom-select.open .custom-select-arrow {
    transform: rotate(180deg);
}

.custom-select-options {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 2px solid #667eea;
    border-radius: 8px;
    margin-top: 5px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    display: none;
    max-height: 300px;
    overflow: hidden;
    flex-direction: column;
}

.custom-select.open .custom-select-options {
    display: flex;
}

.custom-select-search {
    padding: 10px;
    border-bottom: 1px solid #e9ecef;
    background: #f8f9fa;
}

.search-input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    font-size: 0.9rem;
    outline: none;
    transition: all 0.3s ease;
}

.search-input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.1);
}

.custom-select-list {
    max-height: 250px;
    overflow-y: auto;
    padding: 5px 0;
}

.custom-select-option {
    padding: 10px 15px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: #333;
}

.custom-select-option:hover {
    background: #f0f0f0;
}

.custom-select-option:active {
    background: #667eea;
    color: white;
}

/* Scrollbar styling for options list */
.custom-select-list::-webkit-scrollbar {
    width: 8px;
}

.custom-select-list::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.custom-select-list::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 4px;
}

.custom-select-list::-webkit-scrollbar-thumb:hover {
    background: #5568d3;
}

.remove-btn {
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 8px;
    width: 45px;
    height: 45px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    flex-shrink: 0;
    margin-top: 25px;
}

.remove-btn:hover {
    background: #c82333;
    transform: scale(1.05);
}

.remove-btn:active {
    transform: scale(0.95);
}

.form-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    padding-top: 20px;
    border-top: 2px solid #f0f0f0;
}

.btn-primary,
.btn-secondary {
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

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

.btn-secondary:active {
    transform: translateY(0);
}

.error-message {
    color: #dc3545;
    font-size: 0.85rem;
    margin-top: 5px;
    display: none;
}

.entry-row.entry-error .error-message {
    display: block;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    color: white;
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

.loading-overlay p {
    font-size: 1.2rem;
    font-weight: 600;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 20px;
        margin-top: 10px;
    }

    h1 {
        font-size: 2rem;
    }

    .entry-row {
        flex-direction: column;
    }

    .remove-btn {
        width: 100%;
        margin-top: 10px;
    }

    .form-actions {
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
}