/* Variáveis Globais de Cores e Configurações */
:root {
    --bg-primary: #f4f6f9;
    --sidebar-bg: #1e293b;
    --sidebar-text: #94a3b8;
    --sidebar-text-hover: #ffffff;
    --sidebar-active: #3b82f6;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --transition: all 0.25s ease-in-out;
}

/* Reset Global */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
}

/* Layout Principal (App Container) */
.app-container {
    display: flex;
    width: 100%;
}

/* Sidebar / Menu Lateral */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 24px 16px;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.05);
    z-index: 10;
}

.logo-area {
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.logo-area h2 {
    color: #ffffff;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.logo-area span {
    font-size: 0.8rem;
    color: var(--sidebar-text);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-links {
    list-style: none;
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
}

.nav-links li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-links li a i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

.nav-links li a:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--sidebar-text-hover);
}

.nav-links li.active a {
    background-color: var(--sidebar-active);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Conteúdo Principal */
.main-content {
    margin-left: 260px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Barra Superior */
.top-bar {
    background-color: var(--card-bg);
    padding: 20px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.top-bar h1 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-main);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* Grid de Cartões de Sistemas */
.cards-grid {
    padding: 32px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

/* Estilo do Cartão */
.card-system {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card-system:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.08);
    border-color: #cbd5e1;
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 16px;
}

.card-info h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 8px;
}

.card-info p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 20px;
}

/* Botão de Acesso */
.btn-access {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background-color: var(--bg-primary);
    color: var(--primary);
    text-decoration: none;
    padding: 10px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    border: 1px solid transparent;
}

.btn-access:hover {
    background-color: var(--primary);
    color: #ffffff;
}

/* Classe utilitária para controle de nível (Direção) */
.admin-only {
    /* No PHP você pode decidir se exibe ou oculta com base na sessão */
}

/* Responsividade Básica para Telas Menores */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
        padding: 16px 8px;
    }
    .logo-area span,
    .logo-area h2,
    .nav-links span