* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: #070b14;
    color: #f3f6ff;
    font-family: Arial, Helvetica, sans-serif;
}

.pagina-rc4 {
    width: min(1500px, 100%);
    margin: 0 auto;
    padding: 24px 16px 40px;
}

h1 {
    margin: 0 0 18px;
    text-align: center;
    font-size: 28px;
}

.painel {
    padding: 16px;
    border: 1px solid #26344f;
    border-radius: 12px;
    background: #0e1625;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.canvas-wrap {
    position: relative;
    width: 100%;
    overflow: auto;
    border: 1px solid #39455a;
    background: #d8d8d8;
}

#canvasRC4 {
    display: block;
    width: 100%;
    height: auto;
    min-width: 900px;
}

.mensagem-canvas {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(7, 11, 20, 0.78);
    color: #ffffff;
    font-weight: bold;
}

.mensagem-canvas.oculta {
    display: none;
}

.campo-linha {
    display: grid;
    grid-template-columns: 130px minmax(0, 1fr) 72px;
    gap: 10px;
    align-items: center;
    margin-top: 14px;
}

.campo-linha label {
    font-weight: bold;
}

.campo-linha input,
.campo-linha textarea {
    width: 100%;
    border: 1px solid #52627d;
    border-radius: 6px;
    background: #f8f8f8;
    color: #111111;
    font-family: Consolas, "Courier New", monospace;
    font-size: 17px;
    padding: 9px 10px;
}

.campo-linha textarea {
    min-height: 84px;
    resize: vertical;
}

.campo-fluxo {
    grid-template-columns: 130px minmax(0, 1fr);
}

button {
    min-height: 40px;
    border: 1px solid #5e7090;
    border-radius: 7px;
    padding: 8px 12px;
    background: #243652;
    color: #ffffff;
    font-weight: bold;
    cursor: pointer;
}

button:hover:not(:disabled) {
    filter: brightness(1.15);
}

button:disabled {
    opacity: 0.42;
    cursor: not-allowed;
}

.botao-formato {
    background: #3c557e;
}

.botoes {
    display: grid;
    grid-template-columns: repeat(6, minmax(125px, 1fr));
    gap: 10px;
    margin-top: 16px;
}

.status {
    min-height: 24px;
    margin-top: 12px;
    color: #b9cae9;
    font-family: Consolas, "Courier New", monospace;
}

@media (max-width: 1050px) {
    .botoes {
        grid-template-columns: repeat(3, minmax(140px, 1fr));
    }
}

@media (max-width: 650px) {
    .campo-linha,
    .campo-fluxo {
        grid-template-columns: 1fr;
    }

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