body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: rgb(230, 230, 230);
    font-family: Arial, sans-serif;
}

.container {
    border-radius: 15px;
    background-color: rgb(156, 222, 252);
    width: 25vw;
    min-width: 300px;
    max-width: 90%;
    box-shadow: 4px 5px 10px rgba(0,0,0,0.2);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Header */
.header {
    text-align: center;
    padding: 10px;
    font-size: 1.7em;
    font-weight: 900;
    border-bottom: 0.5px solid white;
}

/* Add task row */
.addTask {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

input {
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ccc;
    flex: 1;
    min-width: 150px;
    font-size: 1em;
}

button {
    background-color: rgb(244, 242, 153);
    color: rgb(11, 11, 11);
    padding: 8px 12px;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    transition: 0.2s;
    font-size: 1em;
}

button:hover {
    border: 1px solid black;
    box-shadow: 2px 2px 2px rgba(0,0,0,0.3);
}

/* Task list */
ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

li {
    display: flex;
    flex-direction: column; 
    align-items: flex-start;
    justify-content: space-between;
    border: 1px solid white;
    border-radius: 5px;
    padding: 10px;
    margin-bottom: 7px;
    background-color: rgba(255,255,255,0.7);
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

li.show {
    opacity: 1;
    transform: translateY(0);
}

li.completed {
    text-decoration: line-through;
    opacity: 0.7;
    background-color: rgba(200, 200, 200, 0.5);
}

.buttons-container {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-top: 5px;
}


.signature {
    text-align: center;
    font-size: 0.9em;
    font-style: italic;
    font-weight: bold;
    color: rgba(0, 0, 0, 0.6);
    margin-top: 10px;
    letter-spacing: 1px;
    text-shadow: 0 0 2px rgba(0,0,0,0.2);
}

@media (max-width: 600px) {
    .container {
        width: 90%;
        padding: 15px;
    }

    .header {
        font-size: 1.4em;
    }

    .addTask {
        flex-direction: column;
        gap: 10px;
    }

    input {
        flex: 1 1 100%;
    }

    button {
        width: 100%;
    }

    li {
        padding: 10px;
        font-size: 0.95em;
    }

    .buttons-container {
        justify-content: flex-start;
    }
}