/* reset geral */
* {
    margin: 0;
    padding: 0;
}

/* vartiáveis de css */
:root {
    --verde-principal: #4caf50;
    --verde-escuro: #38833c;
    --cinza-claro: #f4f7f6;
    --cinza-medio: #e0e0e0;
    --branco: #ffffff;
    --preto: #333333;
}

body{
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--preto);
    background-color: var(--cinza-claro);
    display: grid;
    grid-template-rows: auto 1fr auto;
    grid-template-areas:
        "header"
        "main"
        "footer";
    min-height: 100vh;
    margin: 0;
    padding: 0;
}

.site-main,
.site-header,
.site-footer{
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

.site-header{
    grid-area: header;
    color: var(--branco);
    text-align: center;
    padding: 50px 20px;
    border-bottom: 5px solid var(--verde-escuro);
    border-radius: 0 0 12px 12px;
    background: linear-gradient(135deg, var(--verde-principal), var(--verde-escuro));
}

.site-header h1{
    font-size: 3em;
    margin-bottom: 10px;
    text-shadow: 1px 1px 2px #222;
}

.site-header p{
    font-size: 1.2em;
    margin-top: 0;
}

.main-nav ul{
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 0;
    margin: 20px 0 0 0;
    flex-wrap: wrap;
}
.main-nav li{
    margin: 10px;
}

.main-nav a{
    text-decoration: none;
    font-weight: bold;
    padding: 10px 20px;
    background-color: var(--verde-escuro);
    border-radius: 10px;
    border: 1px solid var(--preto);
    transition: background-color 0.3s;
    color: var(--branco);
}

.main-nav a:hover{
    background-color: #2e7d32;
}

.site-main{
    display: grid;
    grid-area: main;
    grid-template-columns: 1fr;
    gap: 40px;
    min-width: 60%;
    background-color: var(--branco);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    padding: 40px;
    margin-top: 30px;
}

.content-section{
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.content-section h2{
    font-size: 2em;
    border-bottom: 2px solid var(--cinza-medio);
    padding-bottom: 10px;
    color: var(--verde-escuro);
}

table{
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    border-radius: 8px;
    overflow:  hidden;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* 10% transperência */
}

th, td{
    padding: 12px;
    border: 1px solid var(--cinza-medio);
    text-align: left;
}

th{
    background-color: var(--verde-principal);
    color: var(--branco);
}

tr:nth-child(even){
background-color: var(--cinza-medio);
}

.grade{
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 20px;

}
.grade img{
    width: 100%;
    border-radius: 10px;
    box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
    
}

.grade img:hover{
    transform: scale(1.05);
}

button{
    background-color: var(--verde-principal);
    color: var(--branco);
    border: none;
    padding: 10px 16px;
    font-size: 1em;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.3s;
}
button:hover{
    background-color: var(--verde-escuro);
}

input[type="text"],
input[type="number"]{
    padding: 8px;
    border: 1px solid var(--cinza-medio);
    font-size: 1em;
    margin-right: 10px;
}

#imagens-galeria,
#dicas-texto,
#resultado-conversao{
    margin-top: 15px;
    font-weight: bold;
}

.site-footer{
    grid-area: footer;
    background-color: var(--preto);
    color: var(--cinza-claro);
    text-align: center;
    padding: 30px 20px;
    margin-top: 40px;
    font-size: 0.8em;
    border-top: 5px solid var(--verde-principal);
    width: 100%;
    box-sizing: border-box;
}

/* gatilhos de resolução - responsividade */

@media (max-width: 768px){
    .site-main{
        padding: 20px;
    }
    .content-section h2{
        font-size: 1.6em;
    }
    .site-header h1{
        font-size: 2em;
    }
    .main-nav ul{
        flex-direction: column;
        align-items: center;
    }
    .main-nav li{
        margin: 5px 0;
    }

}
@media (max-width: 480px){
    input[type="text"],
    input[type="number"]{
        width: 100%;
        margin-bottom: 10px;
    }
    
    button {
        width: 100%;
    }
    
}
.img-borda{
    border: 3px solid black;
}

.img-destaque{
    border: 5px solid red;
}