/* Root button > .btn */

.btn {
    cursor: pointer;
    user-select: none;
    text-align: center;
    vertical-align: middle;
    font-size: 1.8rem;
    box-shadow: var(--shadow-strong);
}

.btn:hover {
    box-shadow: var(--shadow-strong-hover);
}

.btn:active {
    box-shadow: none;
}

.btn[disabled],
.btn-disabled {
    cursor: not-allowed;
    pointer-events: none;
    background-color: var(--grey-white);
    opacity: 0.7;
}

.btn[disabled]:active,
.btn-disabled:active {
    background-color: #ababab;
}


/* Primary button > .btn-yellow */

.btn-yellow {
    padding: 0.7rem 2rem;
    color: #000;
    font-weight: 700;
    background: linear-gradient(135deg, #ffd800 0%, #fff94f 25%, #ffd800 50%, #fff94f 75%, #ffd800 100%);
    background-size: 200% 200%;
    background-position: 0 0;
    border: 2px solid #000;
    border-radius: 0.75rem;
    transition: background-position 1.5s ease;
}

.btn-yellow:hover {
    background-position: 100% 100%;
    transform: translateY(-2px);
}


/* Secondary button > .btn-magic */

.btn-magic {
    padding: 1.5rem;
    color: var(--black-almost);
    background-image: linear-gradient(#f8f9fa, #f8f9fa), linear-gradient(45deg, #ff006e, #8338ec, #3a86ff);
    background-origin: border-box;
    background-clip: padding-box, border-box;
    border: 3px solid transparent;
    border-radius: 1.25rem;
    transition: transform 0.3s ease;
}

.btn-magic:hover {
    transform: scale(1.05);
}


/* Exercise button > .btn-choice */

.btn-choice {
    cursor: pointer;
    overflow: hidden;
    display: block;
    position: relative;
    margin-bottom: 1.4rem;
    padding: 1.4rem 2rem 1.4rem 2.4rem;
    width: 100%;
    text-align: left;
    background-color: white;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    transition: all 0.25s;
}

.btn-choice::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: transparent;
    transition: background-color 0.25s;
}

.btn-choice:hover {
    border-color: var(--blue);
    background-color: var(--white-blue);
}

.btn-choice:hover::before {
    background-color: var(--blue);
}

.btn-choice-correct,
.btn-choice-correct:hover {
    cursor: default;
    border-color: var(--green);
    background-color: var(--white-green);
}

.btn-choice-correct::before,
.btn-choice-correct:hover::before {
    background-color: var(--green);
}


/* Item buttons */

#item-nav a.btn {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.7rem;
    width: 8rem;
    height: 4.5rem;
}