* {
    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;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

header {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1 {
    color: #333;
    font-size: 2em;
}

.mode-indicator {
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9em;
}

.mode-indicator.view-only {
    background: #e3f2fd;
    color: #1976d2;
}

.mode-indicator.edit-mode {
    background: #c8e6c9;
    color: #388e3c;
}

.user-section {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
    display: flex;
    gap: 20px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.input-group {
    flex: 1;
    min-width: 200px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 1em;
    transition: border-color 0.3s;
}

input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #e0e0e0;
    color: #333;
}

.btn-secondary:hover {
    background: #d0d0d0;
}

.btn-success {
    background: #4caf50;
    color: white;
    font-size: 0.9em;
    padding: 8px 16px;
}

.btn-success:hover {
    background: #45a049;
}

.btn-danger {
    background: #f44336;
    color: white;
    font-size: 0.85em;
    padding: 6px 12px;
}

.btn-danger:hover {
    background: #da190b;
}

.categories-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.category-card {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
}

.category-name {
    font-size: 1.3em;
    font-weight: 700;
    color: #333;
}

.member-count {
    background: #667eea;
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85em;
    font-weight: 600;
}

.members-list {
    list-style: none;
    margin-bottom: 15px;
    min-height: 60px;
}

.member-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    margin-bottom: 8px;
    background: #f8f9fa;
    border-radius: 6px;
    transition: background 0.2s;
}

.member-item:hover {
    background: #e9ecef;
}

.member-name {
    color: #333;
    font-weight: 500;
}

.empty-message {
    color: #999;
    font-style: italic;
    text-align: center;
    padding: 20px;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    min-width: 400px;
    animation: slideIn 0.3s;
}

.modal-content h2 {
    margin-bottom: 20px;
    color: #333;
}

.modal-content input {
    margin-bottom: 20px;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Responsive design */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .user-section {
        flex-direction: column;
        align-items: stretch;
    }

    .categories-container {
        grid-template-columns: 1fr;
    }

    .modal-content {
        min-width: 90%;
        margin: 20px;
    }
}