/* --- Estructura Principal y Header --- */
.main-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--bg-secondary);
    /* Slate 800 */
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(8px);
    background: rgba(30, 41, 59, 0.9);
    /* Translucent slate */
}

.admin-header {
    background: var(--bg-secondary);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    margin: 1.5rem auto;
    max-width: 1200px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-md);
}

.header-nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-img {
    height: 36px;
    width: auto;
}

.logo-text {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-main);
    display: none;
}

@media (min-width: 768px) {
    /* .logo-text { display: block; } REMOVED */
}

/* Nuevo contenedor para alinear logo y botón a la izquierda */
.header-start {
    display: flex;
    align-items: center;
}

.header-back-btn {
    display: none;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    background: transparent;
    border: none;
    /* Separador estilo "pipe" */
    border-left: 1px solid var(--border-color);
    margin-left: 1.5rem;
    padding-left: 1.5rem;
    height: 28px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.2s ease;
}

.header-back-btn:hover {
    color: var(--accent);
}

.header-back-btn.visible {
    display: flex;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9375rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.nav-link:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    background: var(--bg-tertiary);
    color: var(--text-main);
}

/* User Session Controls - Auth Buttons Container */
#user-session-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* ✅ NUEVO DISEÑO: Botón "Iniciar Sesión" (Ghost Style + Texto Blanco) */
#user-session-controls .nav-link {
    background-color: transparent;
    color: var(--text-main);
    /* Blanco/Slate-50 */
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    border: 1px solid transparent;
    /* Para evitar saltos si se agrega borde */
}

#user-session-controls .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateY(-1px);
}

/* ✅ NUEVO DISEÑO: Botón "Registrarse" (Gradient Premium) */
#user-session-controls .btn-primary {
    background: linear-gradient(135deg, #2563eb 0%, #0ea5e9 100%);
    /* Blue 600 -> Sky 500 */
    color: white !important;
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.3), 0 2px 4px -1px rgba(37, 99, 235, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    /* Sutil borde interno */
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.5px;
}

#user-session-controls .btn-primary:hover {
    background: linear-gradient(135deg, #1d4ed8 0%, #0284c7 100%);
    /* Un poco más oscuro al hover */
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.4), 0 4px 6px -2px rgba(37, 99, 235, 0.2);
}

#user-session-controls .btn-primary:active {
    transform: translateY(0);
}

/* User Menu */
.user-menu-container {
    position: relative;
}

.user-menu-toggle {
    background: transparent;
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.user-menu-toggle:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-hover);
}

.user-menu-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    background: var(--bg-secondary);
    min-width: 240px;
    z-index: 1001;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.user-menu-dropdown.show {
    display: block;
    animation: fadeIn 0.15s ease-out;
}

.user-menu-header {
    padding: 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.user-menu-name {
    display: block;
    font-weight: 600;
    color: var(--text-main);
}

.user-menu-email {
    display: block;
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.user-menu-group {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.user-menu-group:last-child {
    border-bottom: none;
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 1rem;
    width: 100%;
    text-align: left;
    background: transparent;
    border: none;
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.user-menu-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.user-menu-item i {
    width: 1.25rem;
    text-align: center;
    color: var(--text-muted);
}

.user-menu-item:hover i {
    color: var(--text-main);
}

.user-menu-item.logout-item:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.user-menu-item.logout-item:hover i {
    color: var(--danger);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }

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

@media (max-width: 768px) {
    .main-header {
        padding: 0.5rem 1rem;
        /* Smaller padding */
    }

    .logo-img {
        height: 28px;
        /* Smaller logo */
    }

    .nav-link span {
        display: none;
    }

    .header-nav {
        gap: 0.5rem;
        /* Tighter gap */
    }

    /* Ensure user menu doesn't overflow */
    .user-menu-dropdown {
        right: -10px;
        min-width: 200px;
    }
}