body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding-left: 20px;
    padding-right: 20px;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 15px;
}

.header h1 {
    font-size: 2rem;
    color: #333;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background-color: #007bff;
    color: white;
}

.btn-primary:hover {
    background-color: #0056b3;
}

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

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-danger {
    background-color: #dc3545;
    color: white;
}

.btn-danger:hover {
    background-color: #c82333;
}

.btn-success {
    background-color: #28a745;
    color: white;
}

.btn-success:hover {
    background-color: #218838;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* Entries List */
.entries-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Entry Card */
.entry-card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.2s;
}

.entry-card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
    gap: 15px;
}

.entry-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #333;
    margin: 0;
    flex: 1;
}

.entry-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.entry-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 12px;
    font-size: 0.9rem;
    color: #666;
}

.entry-time {
    display: flex;
    align-items: center;
    gap: 5px;
}

.entry-duration {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #28a745;
    font-weight: 500;
}

.entry-status {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
}

.status-ongoing {
    background-color: #ffc107;
    color: #856404;
}

.status-completed {
    background-color: #d4edda;
    color: #155724;
}

.entry-description {
    color: #555;
    margin-bottom: 12px;
    line-height: 1.5;
}

.entry-refs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
}

.ref-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    background-color: #e9ecef;
    border-radius: 4px;
    font-size: 0.85rem;
    color: #495057;
}

.ref-tag-icon {
    font-size: 0.9rem;
}

/* Empty and Loading States */
.empty-state, .loading-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
    font-size: 1.1rem;
}

.hidden {
    display: none !important;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-content {
    background: white;
    border-radius: 8px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #e0e0e0;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.5rem;
    color: #333;
}

.close-btn {
    background: none;
    border: none;
    font-size: 28px;
    color: #999;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.close-btn:hover {
    color: #333;
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: #555;
}

.form-group input[type="text"],
.form-group input[type="date"],
.form-group input[type="time"],
.form-group input[type="number"],
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-help {
    display: block;
    margin-top: 5px;
    font-size: 0.85rem;
    color: #6c757d;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
}

/* References Container */
.refs-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 10px;
}

.ref-item {
    display: flex;
    gap: 8px;
    align-items: center;
}

.ref-item input {
    flex: 1;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.ref-item input[readonly] {
    background-color: #f8f9fa;
    color: #495057;
}

.ref-badge {
    display: inline-block;
    background-color: #6c757d;
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 3px;
    font-weight: bold;
    margin-right: 4px;
}

.ref-item button {
    padding: 8px 12px;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
}

.ref-item button:hover {
    background-color: #c82333;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .header h1 {
        font-size: 1.5rem;
    }

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

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

    .entry-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .modal-content {
        max-height: 95vh;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 8px 16px;
        font-size: 13px;
    }

    .entry-card {
        padding: 15px;
    }

    .entry-title {
        font-size: 1.1rem;
    }

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

    .form-actions .btn {
        width: 100%;
    }
}

/* Reference Selector Modal Styles */
.ref-selector-search {
    margin-bottom: 20px;
}

.search-input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.ref-selector-section {
    margin-bottom: 20px;
}

.ref-selector-section label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.ref-select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    margin-bottom: 10px;
    font-family: inherit;
}

.ref-select option {
    padding: 8px;
}

.custom-input-row {
    display: flex;
    gap: 8px;
}

.custom-input-row input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.selected-refs-list {
    min-height: 100px;
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 10px;
    background-color: #f9f9f9;
}

.selected-ref-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 10px;
    background-color: white;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    margin-bottom: 8px;
}

.selected-ref-item:last-child {
    margin-bottom: 0;
}

.selected-ref-text {
    flex: 1;
    font-size: 14px;
}

.selected-ref-badge {
    font-size: 11px;
    padding: 2px 8px;
    background-color: #e9ecef;
    border-radius: 10px;
    margin-left: 8px;
    color: #666;
}

.selected-ref-remove {
    background-color: #dc3545;
    color: white;
    border: none;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    margin-left: 8px;
}

.selected-ref-remove:hover {
    background-color: #c82333;
}