body {
    display: flex;
    margin: 0px 0px;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    font-family: 'Poppins', sans-serif;
    background: #f5f5f5; /* cor branca com um toque de cinza */
    color: black;
    transition: background-color 0.5s, color 0.5s;
}

.dark-mode {
    background-color: #121212;
    color: white;
}

.header {
    width: 100%;
    height: 100px;
    display: block;
    justify-content: left;
    position: relative;
    background-color: black;
}

.innerHeader {
    width: 80%;
    height: 100%;
    margin: 0 auto;
    display: block;
}

.titleContainer {
    height: 100%;
    float: left;
    display: table;
}

.title {
    height: 100%;
    margin: 0;
    display: table-cell;
    vertical-align: middle;
    color: white;
    font-family: 'Poppins', sans-serif;
}

.darkmodecheckbox {
    color: white;
    margin-top: 40px;
}

.calculator {
    width: auto;
    height: auto;
    min-height: 400px;
    margin-top: 100px;
    margin-bottom: 100px;
    position: relative;
    display: grid;
    grid-template-areas: 
        "display display"
        "content menu"
        "footer footer";
    grid-template-columns: 4fr 2fr;
    grid-template-rows: 0.5fr fit-content 0.5fr;
    gap: 15px;
    background: rgba(255, 255, 255, 0.8); 
    border-radius: 15px;
    padding: 15px;
    border: 2px solid rgba(255, 255, 255, 0.7);
    transition: background-color 0.5s;
}

.calculator::before {
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    border-radius: 15px;
    background-image: linear-gradient(180deg, green, blue);
    z-index: -999;
}

.dark-mode .calculator {
    background: rgba(0, 0, 0, 0.8); /* fundo preto no modo escuro */
    border: 2px solid gray; /* bordas cinzas no modo escuro */
}

.calculator > div.display {
    grid-area: display;
    background-color: none;
}

.calculator > div.menu {
    grid-area: menu;
    display: grid;
    height: fit-content;
    margin-top: 0px;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(7, 1fr);
    gap: 10px;
    background-color: none;
}

.calculator > div.content {
    grid-area: content;
    display: grid;
    height: fit-content;
    margin-top: 0px;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(7, 1fr);
    gap: 10px;
    background-color: none;
}

.calculator > div.footer {
    grid-area: footer;
    background-color: none;
}

.display {
    display: flex;
}

.display textarea {
    resize: none;
    width: 100%;
    height: 100px;
    padding-left: 15px;
    border: none;
    text-align: left;
    line-height: 6;
    vertical-align: middle;
    border-radius: 5px;
    font-size: 15px;
    font-weight: bold;
    transition: 0.5s;
}

.dark-mode .display textarea {
    color: white;
    background-color: rgba(255, 255, 255, 0.2);
    transition: 0.5s;
}

.content button {
    width: 50px;
    height: 50px;
    font-size: 16px;
    position: relative;
}

.menu button {
    width: 50px;
    height: 50px;
    font-size: 20px;
    position: relative;
}

/* part of the code thanks to Kan academy */
button .tooltiptext {
    visibility: hidden;
    width: 120px;
    background-color: rgba(0, 0, 0, 0.8);
    color: #ffffff;
    font-size: 15px;
    font-weight: normal;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    z-index: 999;
  
    /* Position the tooltip */
    position: absolute;
    z-index: 1;
    bottom: 100%;
    left: 50%;
    margin-left: -60px;
}

button .tooltiptext::after {
    content: " ";
    position: absolute;
    top: 100%; /* At the bottom of the tooltip */
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: rgba(0, 0, 0, 0.8) transparent transparent transparent;
    z-index: 999;
}

.calculator .operator {
    background-color: hsl(35, 100%, 50%);
    font-weight: bold;
}

.calculator .equals {
    background-color: #4CAF50;
    grid-column: span 2;
    font-size: 30px;
    border-radius: 25px;
    width: auto;
}

.calculator .y-condition {
    grid-column: 2;
}

.calculator .z-condition {
    grid-column: 3;
}

.calculator .tautologia {
    display: none;
    width: 100%;
    font-size: 20px;
    margin: 10px 0px;
    padding: 20px 0px;
    background-color: rgba(176, 176, 204, 0.5);
    border-radius: 15px;
    color: black;
    font-family: 'Poppins', sans-serif;
    text-align: center;
    transition: color 0.5s;
}

.calculator .tautologiaVisible {
    display: block;
}

.calculator .footerAnimate {
    animation: table_slide 0.5s ease-in-out forwards;
}

@keyframes table_slide {
    from {
        translate: 0px -100px;
        opacity: 0;
    }
    to {
        translate: 0px 0px;
        opacity: 1;
    }
}

.dark-mode .calculator .tautologia {
    color: white;
}

#tabela table {
    border: none;
    border-collapse: collapse;
    border-radius: 15px;
    width: 100%;
    font-weight: bold;
    color: black;
    background-color: rgba(176, 176, 204, 0.5);
    transition: color 1s;
}

.dark-mode #tabela table {
    color: white;
    transition: color 1s;
}

#tabela th {
    font-size: 20px;
}

#tabela th, #tabela td {
    height: 40px;
    border: none;
    text-align: center;
}

.calculator button {
    border-radius: 50%;
    padding: 0px;
    box-shadow: 0px 5px rgba(0, 0, 0, 0.2);
    background-color: rgba(255, 255, 255, 0.5);
    border: none;
    cursor: pointer;
    transition: 0.5s;
}

.dark-mode .calculator button {
    color: white;
    box-shadow: 0px 5px rgba(255, 255, 255, 0.2);
}

.calculator button:hover .tooltiptext{
    visibility: visible;
    animation: button_hover 0.5s ease-in-out forwards;
}

@keyframes button_hover {
    from {
        translate: 0px -5px;
        opacity: 0;
    }
    to {
        translate: 0px 0px;
        opacity: 1;
    }
}

.calculator button:active {
    animation: button_press 0.1s linear forwards;
    animation-iteration-count: 1;
}

@keyframes button_press {
    from {
        translate: 0px 0px;
        box-shadow: 0px 5px rgba(0, 0, 0, 0.2);
    }
    to {
        translate: 0px 2px;
        box-shadow: 0px 2px rgba(0, 0, 0, 0.2);
    }
}

.navigation {
    float: right;
    margin: 0;
    height: 100%;
}
  
.navigation a {
    height: 100%;
    display: table;
    float: left;
    padding: 0px 20px;
    transition: background-color 0.15s;
}

.navigation a button {
    display: table-cell;
    vertical-align: middle;
}

#aboutUsBtn {
    background-color: #4CAF50; /* Cor verde */
    color: white;
    border: none;
    padding: 10px 20px;
    margin-top: 30px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#aboutUsBtn:hover {
    background-color: #45a049; /* Cor mais escura ao passar o mouse */
}

#aboutUsMessage {
    display: none; /* Inicialmente escondido */
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    border: 2px solid #ccc;
    padding: 30px;
    max-width: 80%;
    text-align: center;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
    z-index: 9999; /* Fica por cima da calculadora */
}

#aboutUsMessage .email {
    color: blue;
    text-decoration: underline;
}

#aboutUsMessage .contributor {
    font-weight: bold;
}

#aboutUsMessage h2 {
    font-size: 24px;
    color: #333;
    margin-bottom: 15px;
}

#aboutUsMessage p {
    font-size: 18px;
    color: #555;
}

#aboutUsMessage button {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

#aboutUsMessage button:hover {
    background-color: #45a049;
}