:root {
    --primary: #1E40AF;
    --primary-dark: #16377A;
    --secondary: #1F2937;
    --hover: #374151;
    --text-light: #FFFFFF;
    --text-dark: #333333;
    --success: #28A745;
    --success-dark: #218838;
    --transition: 0.25s ease;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --radius: 6px;
}

/* Reset apenas para o header, evitando impacto global */
.main-header * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Estilo específico do body apenas quando contém o header */
body:has(.main-header) {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    padding-top: 60px;
    text-rendering: optimizeLegibility;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Header fixo */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background-color: var(--primary);
    color: var(--text-light);
    box-shadow: var(--shadow);
    z-index: 1000;
}

/* Container do header */
.main-header .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 20px;
}

/* Logo */
.main-header .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-light);
    display: flex;
    align-items: center;
    height: 100%;
}

.main-header .logo-link {
    color: inherit;
    text-decoration: none;
    display: inline-block;
    line-height: 1;
}

/* Navegação Desktop */
.main-header .desktop-nav {
    display: flex;
    gap: 1rem;
}

.main-header .nav-link {
    color: var(--text-light);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: background-color var(--transition);
}

.main-header .nav-link:hover {
    background-color: var(--primary-dark);
}

.main-header .btn-login {
    background-color: transparent;
    color: var(--text-light);
    outline: 2px solid var(--primary-dark);
    outline-offset: -2px;
    transition: all var(--transition);
}

.main-header .btn-login:hover {
    background-color: var(--primary-dark);
    color: var(--text-light);
    outline-color: transparent;
}

.main-header .btn-logout {
    background-color: transparent;
    color: var(--text-light);
    outline: 2px solid var(--primary-dark);
    outline-offset: -2px;
    transition: all var(--transition);
}

.main-header .btn-logout:hover {
    background-color: var(--primary-dark);
    color: var(--text-light);
    outline-color: transparent;
}

/* Navegação Mobile */
.main-header .menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 40px;
    height: 40px;
    position: relative;
    padding: 0;
}

.main-header .menu-icon {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-light);
    position: absolute;
    left: 8px;
    transition: var(--transition);
}

.main-header .menu-icon::before,
.main-header .menu-icon::after {
    content: '';
    width: 24px;
    height: 2px;
    background: var(--text-light);
    position: absolute;
    left: 0;
    transition: var(--transition);
}

.main-header .menu-icon::before {
    top: -8px;
}

.main-header .menu-icon::after {
    top: 8px;
}

.mobile-nav {
    position: fixed;
    top: 60px;
    left: -100%;
    width: 280px;
    height: calc(100vh - 60px);
    background-color: var(--secondary);
    box-shadow: var(--shadow);
    transition: left var(--transition);
    z-index: 999;
    overflow-y: auto;
    overflow-x: hidden; /* evita scroll lateral */
}

.mobile-nav[aria-hidden="false"] {
    left: 0;
}

.mobile-nav .nav-links {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 0.5rem;
}

.mobile-nav .nav-link {
    color: var(--text-light);
    padding: 0.75rem 1rem;
    text-decoration: none;
    border-radius: var(--radius);
    transition: background-color var(--transition);
}

.mobile-nav .nav-link:hover,
.mobile-nav .nav-link:focus {
    background-color: var(--hover);
    outline: none;
}

body.menu-open {
    overflow: hidden; /* previne rolagem do fundo */
}

.overlay {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    height: calc(100vh - 60px);
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 998;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Responsividade */
@media (max-width: 991px) {
    .main-header .desktop-nav {
        display: none;
    }
    
    .main-header .menu-toggle {
        display: block;
    }
    
    .main-header .menu-toggle[aria-expanded="true"] .menu-icon {
        background: transparent;
    }
    
    .main-header .menu-toggle[aria-expanded="true"] .menu-icon::before {
        transform: translateY(8px) rotate(45deg);
    }
    
    .main-header .menu-toggle[aria-expanded="true"] .menu-icon::after {
        transform: translateY(-8px) rotate(-45deg);
    }
}