:root {
    --bg-color: #0a0a0a;
    --grid-color: rgba(255, 255, 255, 0.05);
    --accent-color: #e0e0e0;
    --text-muted: #666;
    --font-main: 'Inter', 'Segoe UI', monospace;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

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

body {
    background-color: var(--bg-color);
    color: var(--accent-color);
    font-family: var(--font-main);
    overflow: hidden;
    line-height: 1.6;
}

/* Grid de Fundo */
.background-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: -1;
    pointer-events: none;
}

section {
    height: 100vh;
    width: 100vw;
    display: none; /* Controlado via JS */
    padding: 10%;
    position: relative;
}

section.active {
    display: grid;
    place-content: center;
}

/* Tipografia e Textos */
h1, h2 {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 400;
}

.label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

/* Botões */
.btn-briefing {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 12px 24px;
    font-family: var(--font-mono);
    cursor: pointer;
    text-transform: uppercase;
    font-size: 0.8rem;
    transition: all 0.3s ease;
    width: fit-content;
}

.btn-briefing:hover {
    background: var(--accent-color);
    color: var(--bg-color);
}

/* Tela 1 - Home */
#home {
    grid-template-rows: 1fr auto 1fr;
    align-items: center;
}

.logo-placeholder {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -2px;
    margin-left: -5%; /* Desvio intencional */
}

/* Tela 2 - Operacional */
#contexto {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.operacional-report {
    border-left: 1px solid var(--text-muted);
    padding-left: 20px;
}

/* Tela 3 - Sistema */
#sistema {
    text-align: center;
    place-items: center;
}

.diagrama-container {
    display: flex;
    gap: 20px;
    margin-top: 50px;
}

.block {
    border: 1px solid var(--text-muted);
    padding: 20px 40px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    position: relative;
}

/* Tela 4 - Contato */
#posicionamento {
    place-content: center;
    max-width: 600px;
    margin: 0 auto;
}

/* Animações Sutis */
.fade-in {
    animation: fadeIn 1s forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}