```css
/* ==========================================
   NEXUS MONITOR
   Arquivo: estilo.css
   Versão: V0.4
   ========================================== */


/* ==========================================
   CONFIGURAÇÕES GERAIS
   ========================================== */

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    min-height: 100%;
}

body {
    min-height: 100vh;

    background: #1e2328;

    color: #ffffff;

    font-family: Arial, Helvetica, sans-serif;
}


/* ==========================================
   TELA DE LOGIN
   ========================================== */

.login-container {
    width: 90%;
    max-width: 400px;

    padding: 35px;

    position: absolute;

    top: 50%;
    left: 50%;

    transform: translate(-50%, -50%);

    background: #282e34;

    border: 1px solid #3b434b;

    border-radius: 12px;

    box-shadow: 0 0 25px rgba(0, 0, 0, 0.5);
}


/* ---------- LOGO ---------- */

.logo {
    text-align: center;

    margin-bottom: 30px;
}

.logo h1 {
    font-size: 32px;

    letter-spacing: 4px;
}

.logo p {
    margin-top: 8px;

    color: #aeb6bd;

    font-size: 14px;

    letter-spacing: 1px;
}


/* ---------- CAMPOS ---------- */

.campo {
    margin-bottom: 20px;
}

.campo label {
    display: block;

    margin-bottom: 8px;

    color: #d5d9dc;

    font-size: 14px;
}

.campo input {
    width: 100%;

    padding: 13px;

    border: 1px solid #454d55;

    border-radius: 6px;

    background: #1e2328;

    color: #ffffff;

    font-size: 15px;

    outline: none;
}

.campo input:focus {
    border-color: #8c969f;

    box-shadow: 0 0 5px rgba(140, 150, 159, 0.2);
}


/* ---------- BOTÃO LOGIN ---------- */

.botao-login {
    width: 100%;

    padding: 13px;

    border: none;

    border-radius: 6px;

    background: #3b434b;

    color: #ffffff;

    font-size: 16px;

    font-weight: bold;

    cursor: pointer;

    transition: 0.2s;
}

.botao-login:hover {
    background: #4a545e;
}


/* ---------- MENSAGEM ---------- */

.mensagem {
    min-height: 20px;

    margin-top: 18px;

    text-align: center;

    color: #ffffff;

    font-size: 14px;
}


/* ==========================================
   PAINEL PRINCIPAL
   ========================================== */

.painel {
    width: 95%;
    max-width: 1250px;

    min-height: 90vh;

    margin: 30px auto;

    padding: 25px;

    background: #282e34;

    border: 1px solid #3b434b;

    border-radius: 12px;

    box-shadow: 0 0 25px rgba(0, 0, 0, 0.5);
}


/* ==========================================
   CABEÇALHO
   ========================================== */

.cabecalho {
    display: flex;

    justify-content: space-between;

    align-items: center;

    padding-bottom: 20px;

    border-bottom: 1px solid #454d55;
}

.cabecalho h1 {
    font-size: 28px;

    letter-spacing: 2px;
}

.cabecalho p {
    margin-top: 6px;

    color: #aeb6bd;

    font-size: 13px;

    letter-spacing: 1px;
}


/* ==========================================
   STATUS DO SISTEMA
   ========================================== */

.status-sistema {
    padding: 10px 16px;

    background: #344038;

    border: 1px solid #4d6252;

    border-radius: 6px;

    color: #9ed3a5;

    font-size: 13px;

    font-weight: bold;
}


/* ==========================================
   CONTEÚDO
   ========================================== */

.conteudo {
    padding-top: 30px;
}

.conteudo h2 {
    margin-bottom: 10px;

    font-size: 22px;

    letter-spacing: 1px;
}

.conteudo > p {
    margin-bottom: 25px;

    color: #aeb6bd;

    font-size: 14px;
}


/* ==========================================
   MENU PRINCIPAL
   ========================================== */

.menu {
    display: grid;

    grid-template-columns: repeat(4, 1fr);

    gap: 12px;

    width: 100%;

    margin-top: 25px;
}

.menu a {
    display: flex;

    justify-content: center;

    align-items: center;

    min-height: 55px;

    padding: 12px 15px;

    background: #3b434b;

    border: 1px solid #4a545e;

    border-radius: 7px;

    color: #ffffff;

    text-decoration: none;

    font-size: 13px;

    font-weight: bold;

    text-align: center;

    transition: 0.2s;
}

.menu a:hover {
    background: #4a545e;

    border-color: #68737d;

    transform: translateY(-2px);
}


/* ==========================================
   ÁREA DE MÓDULOS
   ========================================== */

.modulos {
    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 15px;

    margin-top: 30px;
}

.modulo {
    padding: 20px;

    background: #22282d;

    border: 1px solid #3b434b;

    border-radius: 8px;

    text-align: center;
}

.modulo h3 {
    margin-bottom: 10px;

    font-size: 16px;
}

.modulo p {
    color: #aeb6bd;

    font-size: 13px;
}


/* ==========================================
   INDICADORES DA INJEC NEXUS 01
   ========================================== */
 
/* ==========================================
   TEMPERATURA DA INJEC NEXUS 01
   ========================================== */

.modulo-temperatura {
    grid-column: span 2;
}

.modulo-temperatura .temperatura {
    margin-top: 15px;

    padding: 20px;

    background: #22282d;

    border: 1px solid #4a545e;

    border-radius: 8px;

    text-align: center;

    font-size: 32px;

    font-weight: bold;

    letter-spacing: 2px;
}

.modulo-temperatura .temperatura small {
    font-size: 16px;

    color: #aeb6bd;

    letter-spacing: 0;
}


/* ---------- TEMPERATURA NORMAL ---------- */

.temperatura.normal {
    color: #9ed3a5;

    border-color: #4d7057;
}


/* ---------- TEMPERATURA DE ATENÇÃO ---------- */

.temperatura.atencao {
    color: #e0c878;

    border-color: #706342;
}


/* ---------- TEMPERATURA ALTA ---------- */

.temperatura.alta {
    color: #e0a0a0;

    border-color: #664444;
}


/* ---------- TEMPERATURA DESCONHECIDA ---------- */

.temperatura.desconhecida {
    color: #aeb6bd;

    border-color: #4a5259;
}


/* ==========================================
   AJUSTE PARA CELULAR
   ========================================== */

@media (max-width: 700px) {

    .modulo-temperatura {
        grid-column: span 1;
    }

    .modulo-temperatura .temperatura {
        font-size: 28px;
    }

}

  

.indicador {
    margin-top: 12px;

    padding: 10px;

    border-radius: 6px;

    font-size: 14px;

    font-weight: bold;

    text-align: center;
}


/* ---------- EQUIPAMENTO DESLIGADO ---------- */

.indicador.desligado {
    background: #3a2b2b;

    border: 1px solid #664444;

    color: #e0a0a0;
}


/* ---------- EQUIPAMENTO ATIVO ---------- */

.indicador.ligado {
    background: #2d4033;

    border: 1px solid #4d7057;

    color: #9ed3a5;
}


/* ---------- ATENÇÃO ---------- */

.indicador.atencao {
    background: #403b2d;

    border: 1px solid #706342;

    color: #e0c878;
}


/* ---------- ESTADO DESCONHECIDO ---------- */

.indicador.desconhecido {
    background: #30353a;

    border: 1px solid #4a5259;

    color: #aeb6bd;
}


/* ==========================================
   RODAPÉ
   ========================================== */

.rodape {
    margin-top: 35px;

    padding-top: 15px;

    border-top: 1px solid #454d55;

    text-align: center;

    color: #7f8992;

    font-size: 12px;
}


/* ==========================================
   RESPONSIVIDADE
   ========================================== */


/* ---------- TABLET ---------- */

@media (max-width: 900px) {

    .menu {
        grid-template-columns: repeat(2, 1fr);
    }

    .modulos {
        grid-template-columns: repeat(2, 1fr);
    }

}


/* ---------- CELULAR ---------- */

@media (max-width: 700px) {

    .login-container {
        width: 92%;

        padding: 25px;
    }


    .painel {
        width: 94%;

        min-height: auto;

        margin: 15px auto;

        padding: 18px;
    }


    .cabecalho {
        flex-direction: column;

        gap: 15px;

        text-align: center;
    }


    .cabecalho h1 {
        font-size: 23px;
    }


    .cabecalho p {
        font-size: 12px;
    }


    .menu {
        grid-template-columns: 1fr;
    }


    .menu a {
        width: 100%;
    }


    .modulos {
        grid-template-columns: 1fr;
    }

}


/* ---------- CELULAR PEQUENO ---------- */

@media (max-width: 400px) {

    .login-container {
        padding: 20px;
    }

    .logo h1 {
        font-size: 27px;
    }

    .painel {
        padding: 14px;
    }

    .cabecalho h1 {
        font-size: 20px;
    }

}