:root {
    --bg-color: #000000;
    --primary-color: #00ff00;
    --secondary-color: #008000;
    --highlight-color: #00ff00;
    --text-color: #00ff00;
    --font-stack: 'Courier New', Courier, monospace;
    --panel-bg: rgba(0, 20, 0, 0.5);
    --panel-shadow: rgba(0, 255, 0, 0.1);
}

body {
    font-family: var(--font-stack);
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    /* No scroll on main screen */
}

header {
    background-color: transparent;
    color: var(--text-color);
    padding: 10px 20px;
    text-align: left;
    border-bottom: 1px solid var(--secondary-color);
    flex-shrink: 0;
}

h1 {
    margin: 0;
    font-size: 1.2rem;
    text-transform: uppercase;
}

nav {
    margin-top: 5px;
    font-size: 0.9rem;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
}

nav a:hover {
    text-decoration: underline;
}

/* Layout geral dos containers */
.container-principal {
    display: flex;
    gap: 20px;
    padding: 20px;
    flex: 1;
    overflow: hidden;
}

/* Layout do lado esquerdo */
.sidebar {
    flex-basis: 25%;
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
    padding-right: 10px;
}

/* Custom Scrollbar for Webkit */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

.nav-btn {
    padding: 15px;
    background: transparent;
    border: 1px solid var(--secondary-color);
    color: var(--text-color);
    font-family: var(--font-stack);
    cursor: pointer;
    text-align: left;
    font-size: 1rem;
    transition: all 0.2s ease;
    outline: none;
    text-transform: uppercase;
}

.nav-btn:hover {
    background-color: rgba(0, 255, 0, 0.1);
    box-shadow: 0 0 5px var(--primary-color);
}

.nav-btn.active,
.nav-btn:focus {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: var(--bg-color);
    font-weight: bold;
    box-shadow: 0 0 10px var(--primary-color);
}

/* lado direito */
.content-area {
    flex-grow: 1;
    border: 1px solid var(--primary-color);
    padding: 20px;
    position: relative;
    overflow-y: auto;
    /* background-color: rgba(0, 20, 0, 0.5);
    box-shadow: inset 0 0 20px rgba(0, 255, 0, 0.1); */
    background-color: var(--panel-bg);
    box-shadow: inset 0 0 20px var(--panel-shadow);
}

/* Lógica de Esconder/Mostrar */
.conteudo-box {
    display: none;
    animation: fadeIn 0.4s;
}

.conteudo-box.active {
    display: block;
}

footer {
    background-color: transparent;
    color: var(--secondary-color);
    text-align: left;
    padding: 5px 20px;
    font-size: 0.8rem;
    border-top: 1px solid var(--secondary-color);
    flex-shrink: 0;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Selection Styles */
::selection {
    background-color: var(--primary-color);
    color: var(--bg-color);
}

/* --- TEMAS DE CORES (Sobrescrevem as variáveis do :root) --- */

/* Tema RED (Alerta/Erro) */
body[data-theme="red"] {
    --primary-color: #ff3333;
    --secondary-color: #990000;
    --highlight-color: #ff3333;
    --text-color: #ff3333;
    --panel-bg: rgba(20, 0, 0, 0.5);
    --panel-shadow: rgba(255, 0, 0, 0.1);
}

/* Tema AMBER (Monitor de Fósforo Laranja - Clássico) */
body[data-theme="amber"] {
    --primary-color: #ffb000;
    --secondary-color: #996600;
    --highlight-color: #ffb000;
    --text-color: #ffb000;
    --panel-bg: rgba(20, 0, 0, 0.5);
    --panel-shadow: rgba(255, 0, 0, 0.1);
}

/* Tema BLUE (Ice/Futurista) */
body[data-theme="blue"] {
    --primary-color: #0088ff;
    --secondary-color: #004488;
    --highlight-color: #0088ff;
    --text-color: #0088ff;
    --panel-bg: rgba(0, 10, 20, 0.5);
    --panel-shadow: rgba(0, 136, 255, 0.1);
}

/* --- Estilo dos Botões de Tema --- */
.theme-selector {
    display: inline-block;
    margin-left: 20px;
    font-size: 0.8rem;
}

.theme-btn {
    background: none;
    border: none;
    color: var(--secondary-color);
    /* Começa mais escuro */
    cursor: pointer;
    font-family: var(--font-stack);
    padding: 0 5px;
    transition: color 0.2s;
}

.theme-btn:hover {
    color: var(--primary-color);
    text-shadow: 0 0 5px var(--primary-color);
}

/* Marca qual tema está ativo visualmente (opcional) */
.theme-btn.active-theme {
    color: var(--primary-color);
    font-weight: bold;
    text-decoration: underline;
}