/* Estilos base e animações */
        body {
            font-family: 'Inter', sans-serif;
            background-color: #fdfaf6;
            color: #3a3a3a;
        }
        .tab-active {
            border-bottom-color: #f59e0b;
            color: #f59e0b;
        }
        .routine-tab.tab-active {
            border-bottom-color: #f59e0b;
            color: #f59e0b;
        }
        .level-card {
            transition: all 0.3s ease-in-out;
        }
        .modal {
            display: none;
            position: fixed;
            z-index: 100;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgb(0,0,0);
            background-color: rgba(0,0,0,0.4);
            justify-content: center;
            align-items: center;
        }
        .modal-content {
            background-color: #fefefe;
            margin: auto;
            padding: 24px;
            border-radius: 1rem;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            max-width: 400px;
            text-align: center;
        }
        .scrollable-list {
            max-height: 400px;
            overflow-y: auto;
            border: 1px solid #e5e7eb;
            border-radius: 0.5rem;
            padding: 1rem;
        }
        .expandable-header {
            cursor: pointer;
            user-select: none;
        }
        .animate-slide-in {
            animation: slide-in 0.5s forwards;
        }
        .animate-slide-out {
            animation: slide-out 0.5s forwards;
        }
        @keyframes slide-in {
            from { transform: translateY(-100%); }
            to { transform: translateY(0); }
        }
        @keyframes slide-out {
            from { transform: translateY(0); }
            to { transform: translateY(-100%); }
        }
        .exercise-item:hover {
            background-color: #f5f5f5;
        }
        .selected-exercise {
            background-color: #fef3c7;
            border-color: #fbbf24;
        }
        .fade-in {
            animation: fadeIn 0.5s ease-in-out;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }