:root {
    --primary-color: #5643cc;
    --primary-hover: #4936b3;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
    --dark-text: #212529;
    --gray-text: #6c757d;
    --border-color: #dee2e6;
    --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: #f5f7fb;
}

/* Container principal */
.todo-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* Cabeçalho */
.todo-header {
    text-align: center;
    margin-bottom: 2rem;
}

    .todo-header h1 {
        color: var(--primary-color);
        font-size: 2.5rem;
        margin-bottom: 0.5rem;
        font-weight: 600;
    }

.subtitle {
    color: var(--gray-text);
    font-size: 1.1rem;
    margin-top: 0;
}

/* Área de adição de tarefas */
.add-task-container {
    display: flex;
    margin-bottom: 2rem;
    gap: 10px;
}

.task-input {
    flex: 1;
    padding: 0.8rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: border-color 0.3s, box-shadow 0.3s;
}

    .task-input:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(86, 67, 204, 0.25);
    }

.btn-add {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: background-color 0.3s;
}

    .btn-add:hover {
        background-color: var(--primary-hover);
    }

.icon {
    font-size: 1.2rem;
    font-weight: bold;
}

/* Lista de tarefas */
.tasks-container {
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
    padding: 1rem;
    min-height: 200px;
}

.task-list {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.task-item {
    display: flex;
    align-items: center;
    padding: 0.8rem;
    margin-bottom: 0.8rem;
    background-color: white;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

    .task-item:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }

    .task-item.completed {
        border-left-color: var(--success-color);
        opacity: 0.8;
    }

/* Checkbox personalizado */
.task-checkbox {
    margin-right: 12px;
    position: relative;
}

    .task-checkbox input[type="checkbox"] {
        opacity: 0;
        position: absolute;
    }

    .task-checkbox label {
        position: relative;
        display: inline-block;
        width: 20px;
        height: 20px;
        border: 2px solid var(--primary-color);
        border-radius: 4px;
        cursor: pointer;
    }

    .task-checkbox input[type="checkbox"]:checked + label::after {
        content: '✓';
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        color: var(--success-color);
        font-weight: bold;
    }

/* Título da tarefa */
.task-title {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid transparent;
    background-color: transparent;
    font-size: 1rem;
    transition: border-color 0.3s;
}

    .task-title:focus {
        outline: none;
        border-color: var(--border-color);
        background-color: white;
        border-radius: 4px;
    }

.completed-text {
    text-decoration: line-through;
    color: var(--gray-text);
}

/* Botão de exclusão */
.btn-delete {
    background-color: transparent;
    color: var(--gray-text);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
}

    .btn-delete:hover {
        background-color: var(--danger-color);
        color: white;
    }

.delete-icon {
    font-size: 1.5rem;
    line-height: 1;
}

/* Estado vazio */
.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--gray-text);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.empty-subtitle {
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Resumo das tarefas */
.task-summary {
    margin-top: 1rem;
    text-align: right;
    font-size: 0.9rem;
    color: var(--gray-text);
    padding: 0.5rem;
}

/* Responsividade */
@media (max-width: 600px) {
    .todo-container {
        padding: 1rem;
    }

    .add-task-container {
        flex-direction: column;
    }

    .btn-add {
        width: 100%;
        justify-content: center;
    }

    .task-item {
        padding: 0.6rem;
    }
}