:root {
    --mainBgColour: linear-gradient(135deg, #ffc695 0.000%, #636676 50.000%, #001426 100.000%);
    --elementBgColour: #454a65d7;
    --liBgColour: rgba(93, 114, 146, 0.497);
    --placeHolderTextColour: #bcbcbc;
    --headerFontFamily: "Recursive", sans-serif;
    --liFontFamily: 'Patrick Hand', sans-serif;
    --textColour: #fff;
    --boxShadow: 0 0 100px rgba(0, 0, 0, 0.5);
    --liBoxShadow: 0 0 10px rgba(0, 0, 0, 0.1);
    --boxBorders: 3px solid rgba(255, 255, 255, 0.18);
}

body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--mainBgColour);
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    padding: 0 20px;
}

.todo-app {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 30px;
    color: var(--textColour);
    border-radius: 20px;
    box-shadow: var(--boxShadow);
    border: var(--boxBorders);
    backdrop-filter: blur(30px);
}

.todo-app h1 {
    font-size: 2.5rem;
    font-family: var(--headerFontFamily);
    text-transform: uppercase;
    letter-spacing: 0.1rem;
}

.input-area {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.input-area input {
    flex: 1;
    padding: 10px 17px;
    font-size: 1.1rem;
    border: none;
    outline: none;
    border-radius: 22px;
    background-color: var(--elementBgColour);
    color: var(--textColour);
}

.input-area input::placeholder {
    color: var(--placeHolderTextColour);
}

.input-area button {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 10px;
    padding: 8px;
    border-radius: 50%;
    color: white;
    font-size: 1.4rem;
    background-color: var(--elementBgColour);
    border: var(--boxBorders);
    cursor: pointer;
    transition: all 0.2s ease;
}

.input-area button:hover {
    background-color: #515778;
    transform: scale(1.1);
}

.todos-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#task-list {
    width: 100%;
    box-sizing: border-box;
    padding: 0 25px 0 0;
}

#task-list li {
    font-family: var(--liFontFamily);
    letter-spacing: 0.1rem;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--liBgColour);
    margin-bottom: 10px;
    padding: 8px 10px;
    border-radius: 30px;
    font-size: 1.2rem;
    color: var(--textColour);
    position: relative;
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease;
}

#task-list li:hover {
    box-shadow: var(--liBoxShadow);
    transform: translateY(-1px);
}

#task-list li .checkbox {
    min-width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.15);
    background: transparent;
    border-radius: 50%;
    appearance: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

#task-list li .checkbox:checked {
    background-color: var(--elementBgColour);
    transform: scale(1.1);
}

#task-list li .checkbox:checked::before {
    content: '\2713';
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
}

#task-list li span {
    flex: 1;
    min-width: 0;
    margin-left: 10px;
    overflow-wrap: break-word;
}

#task-list li.completed span {
    text-decoration: 2px line-through var(--placeHolderTextColour);
    color: var(--placeHolderTextColour);
}

.task-buttons {
    display: flex;
    flex-shrink: 0;
    gap: 10px;
}

.task-buttons button {
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    color: white;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.task-buttons button:hover {
    transform: scale(1.2);
    display: flex;
    justify-content: center;
    align-items: center;
}

.task-buttons .edit-btn {
    background-color: #6c879f;
}

.task-buttons .delete-btn {
    background-color: #31304b;
}

.todos-container p {
    font-family: var(--headerFontFamily);
    font-size: 1.5rem;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
}

@media (max-width: 600px) {
    .container {
        margin: 0 20px;
        padding: 0 1;
    }

    .todo-app {
        padding: 1.5rem;
        gap: 20px;
    }

    .input-area input {
        font-size: 1rem;
    }

    #task-list li {
        font-size: 1rem;
    }
}